Merge branch 'cc/apply-am'

"git am" has been taught to make an internal call to "git apply"'s
innards without spawning the latter as a separate process.

* cc/apply-am: (41 commits)
  builtin/am: use apply API in run_apply()
  apply: learn to use a different index file
  apply: pass apply state to build_fake_ancestor()
  apply: refactor `git apply` option parsing
  apply: change error_routine when silent
  usage: add get_error_routine() and get_warn_routine()
  usage: add set_warn_routine()
  apply: don't print on stdout in verbosity_silent mode
  apply: make it possible to silently apply
  apply: use error_errno() where possible
  apply: make some parsing functions static again
  apply: move libified code from builtin/apply.c to apply.{c,h}
  apply: rename and move opt constants to apply.h
  builtin/apply: rename option parsing functions
  builtin/apply: make create_one_file() return -1 on error
  builtin/apply: make try_create_file() return -1 on error
  builtin/apply: make write_out_results() return -1 on error
  builtin/apply: make write_out_one_result() return -1 on error
  builtin/apply: make create_file() return -1 on error
  builtin/apply: make add_index_file() return -1 on error
  ...

9 files changed, 5199 insertions, 4877 deletions

diff --git a/Makefile b/Makefile
index 7f184923dd..df4f86bb30 100644
--- a/Makefile
+++ b/Makefile
@@ -696,6 +696,7 @@ LIB_OBJS += abspath.o
 LIB_OBJS += advice.o
 LIB_OBJS += alias.o
 LIB_OBJS += alloc.o
+LIB_OBJS += apply.o
 LIB_OBJS += archive.o
 LIB_OBJS += archive-tar.o
 LIB_OBJS += archive-zip.o
diff --git a/apply.c b/apply.c
new file mode 100644
index 0000000000..289cbd0b8c
--- /dev/null
+++ b/apply.c
@@ -0,0 +1,4988 @@
+/*
+ * apply.c
+ *
+ * Copyright (C) Linus Torvalds, 2005
+ *
+ * This applies patches on top of some (arbitrary) version of the SCM.
+ *
+ */
+
+#include "cache.h"
+#include "blob.h"
+#include "delta.h"
+#include "diff.h"
+#include "dir.h"
+#include "xdiff-interface.h"
+#include "ll-merge.h"
+#include "lockfile.h"
+#include "parse-options.h"
+#include "quote.h"
+#include "rerere.h"
+#include "apply.h"
+
+static void git_apply_config(void)
+{
+	git_config_get_string_const("apply.whitespace", &apply_default_whitespace);
+	git_config_get_string_const("apply.ignorewhitespace", &apply_default_ignorewhitespace);
+	git_config(git_default_config, NULL);
+}
+
+static int parse_whitespace_option(struct apply_state *state, const char *option)
+{
+	if (!option) {
+		state->ws_error_action = warn_on_ws_error;
+		return 0;
+	}
+	if (!strcmp(option, "warn")) {
+		state->ws_error_action = warn_on_ws_error;
+		return 0;
+	}
+	if (!strcmp(option, "nowarn")) {
+		state->ws_error_action = nowarn_ws_error;
+		return 0;
+	}
+	if (!strcmp(option, "error")) {
+		state->ws_error_action = die_on_ws_error;
+		return 0;
+	}
+	if (!strcmp(option, "error-all")) {
+		state->ws_error_action = die_on_ws_error;
+		state->squelch_whitespace_errors = 0;
+		return 0;
+	}
+	if (!strcmp(option, "strip") || !strcmp(option, "fix")) {
+		state->ws_error_action = correct_ws_error;
+		return 0;
+	}
+	return error(_("unrecognized whitespace option '%s'"), option);
+}
+
+static int parse_ignorewhitespace_option(struct apply_state *state,
+						 const char *option)
+{
+	if (!option || !strcmp(option, "no") ||
+	    !strcmp(option, "false") || !strcmp(option, "never") ||
+	    !strcmp(option, "none")) {
+		state->ws_ignore_action = ignore_ws_none;
+		return 0;
+	}
+	if (!strcmp(option, "change")) {
+		state->ws_ignore_action = ignore_ws_change;
+		return 0;
+	}
+	return error(_("unrecognized whitespace ignore option '%s'"), option);
+}
+
+int init_apply_state(struct apply_state *state,
+		     const char *prefix,
+		     struct lock_file *lock_file)
+{
+	memset(state, 0, sizeof(*state));
+	state->prefix = prefix;
+	state->prefix_length = state->prefix ? strlen(state->prefix) : 0;
+	state->lock_file = lock_file;
+	state->newfd = -1;
+	state->apply = 1;
+	state->line_termination = '\n';
+	state->p_value = 1;
+	state->p_context = UINT_MAX;
+	state->squelch_whitespace_errors = 5;
+	state->ws_error_action = warn_on_ws_error;
+	state->ws_ignore_action = ignore_ws_none;
+	state->linenr = 1;
+	string_list_init(&state->fn_table, 0);
+	string_list_init(&state->limit_by_name, 0);
+	string_list_init(&state->symlink_changes, 0);
+	strbuf_init(&state->root, 0);
+
+	git_apply_config();
+	if (apply_default_whitespace && parse_whitespace_option(state, apply_default_whitespace))
+		return -1;
+	if (apply_default_ignorewhitespace && parse_ignorewhitespace_option(state, apply_default_ignorewhitespace))
+		return -1;
+	return 0;
+}
+
+void clear_apply_state(struct apply_state *state)
+{
+	string_list_clear(&state->limit_by_name, 0);
+	string_list_clear(&state->symlink_changes, 0);
+	strbuf_release(&state->root);
+
+	/* &state->fn_table is cleared at the end of apply_patch() */
+}
+
+static void mute_routine(const char *msg, va_list params)
+{
+	/* do nothing */
+}
+
+int check_apply_state(struct apply_state *state, int force_apply)
+{
+	int is_not_gitdir = !startup_info->have_repository;
+
+	if (state->apply_with_reject && state->threeway)
+		return error("--reject and --3way cannot be used together.");
+	if (state->cached && state->threeway)
+		return error("--cached and --3way cannot be used together.");
+	if (state->threeway) {
+		if (is_not_gitdir)
+			return error(_("--3way outside a repository"));
+		state->check_index = 1;
+	}
+	if (state->apply_with_reject) {
+		state->apply = 1;
+		if (state->apply_verbosity == verbosity_normal)
+			state->apply_verbosity = verbosity_verbose;
+	}
+	if (!force_apply && (state->diffstat || state->numstat || state->summary || state->check || state->fake_ancestor))
+		state->apply = 0;
+	if (state->check_index && is_not_gitdir)
+		return error(_("--index outside a repository"));
+	if (state->cached) {
+		if (is_not_gitdir)
+			return error(_("--cached outside a repository"));
+		state->check_index = 1;
+	}
+	if (state->check_index)
+		state->unsafe_paths = 0;
+	if (!state->lock_file)
+		return error("BUG: state->lock_file should not be NULL");
+
+	if (state->apply_verbosity <= verbosity_silent) {
+		state->saved_error_routine = get_error_routine();
+		state->saved_warn_routine = get_warn_routine();
+		set_error_routine(mute_routine);
+		set_warn_routine(mute_routine);
+	}
+
+	return 0;
+}
+
+static void set_default_whitespace_mode(struct apply_state *state)
+{
+	if (!state->whitespace_option && !apply_default_whitespace)
+		state->ws_error_action = (state->apply ? warn_on_ws_error : nowarn_ws_error);
+}
+
+/*
+ * This represents one "hunk" from a patch, starting with
+ * "@@ -oldpos,oldlines +newpos,newlines @@" marker.  The
+ * patch text is pointed at by patch, and its byte length
+ * is stored in size.  leading and trailing are the number
+ * of context lines.
+ */
+struct fragment {
+	unsigned long leading, trailing;
+	unsigned long oldpos, oldlines;
+	unsigned long newpos, newlines;
+	/*
+	 * 'patch' is usually borrowed from buf in apply_patch(),
+	 * but some codepaths store an allocated buffer.
+	 */
+	const char *patch;
+	unsigned free_patch:1,
+		rejected:1;
+	int size;
+	int linenr;
+	struct fragment *next;
+};
+
+/*
+ * When dealing with a binary patch, we reuse "leading" field
+ * to store the type of the binary hunk, either deflated "delta"
+ * or deflated "literal".
+ */
+#define binary_patch_method leading
+#define BINARY_DELTA_DEFLATED	1
+#define BINARY_LITERAL_DEFLATED 2
+
+/*
+ * This represents a "patch" to a file, both metainfo changes
+ * such as creation/deletion, filemode and content changes represented
+ * as a series of fragments.
+ */
+struct patch {
+	char *new_name, *old_name, *def_name;
+	unsigned int old_mode, new_mode;
+	int is_new, is_delete;	/* -1 = unknown, 0 = false, 1 = true */
+	int rejected;
+	unsigned ws_rule;
+	int lines_added, lines_deleted;
+	int score;
+	unsigned int is_toplevel_relative:1;
+	unsigned int inaccurate_eof:1;
+	unsigned int is_binary:1;
+	unsigned int is_copy:1;
+	unsigned int is_rename:1;
+	unsigned int recount:1;
+	unsigned int conflicted_threeway:1;
+	unsigned int direct_to_threeway:1;
+	struct fragment *fragments;
+	char *result;
+	size_t resultsize;
+	char old_sha1_prefix[41];
+	char new_sha1_prefix[41];
+	struct patch *next;
+
+	/* three-way fallback result */
+	struct object_id threeway_stage[3];
+};
+
+static void free_fragment_list(struct fragment *list)
+{
+	while (list) {
+		struct fragment *next = list->next;
+		if (list->free_patch)
+			free((char *)list->patch);
+		free(list);
+		list = next;
+	}
+}
+
+static void free_patch(struct patch *patch)
+{
+	free_fragment_list(patch->fragments);
+	free(patch->def_name);
+	free(patch->old_name);
+	free(patch->new_name);
+	free(patch->result);
+	free(patch);
+}
+
+static void free_patch_list(struct patch *list)
+{
+	while (list) {
+		struct patch *next = list->next;
+		free_patch(list);
+		list = next;
+	}
+}
+
+/*
+ * A line in a file, len-bytes long (includes the terminating LF,
+ * except for an incomplete line at the end if the file ends with
+ * one), and its contents hashes to 'hash'.
+ */
+struct line {
+	size_t len;
+	unsigned hash : 24;
+	unsigned flag : 8;
+#define LINE_COMMON     1
+#define LINE_PATCHED	2
+};
+
+/*
+ * This represents a "file", which is an array of "lines".
+ */
+struct image {
+	char *buf;
+	size_t len;
+	size_t nr;
+	size_t alloc;
+	struct line *line_allocated;
+	struct line *line;
+};
+
+static uint32_t hash_line(const char *cp, size_t len)
+{
+	size_t i;
+	uint32_t h;
+	for (i = 0, h = 0; i < len; i++) {
+		if (!isspace(cp[i])) {
+			h = h * 3 + (cp[i] & 0xff);
+		}
+	}
+	return h;
+}
+
+/*
+ * Compare lines s1 of length n1 and s2 of length n2, ignoring
+ * whitespace difference. Returns 1 if they match, 0 otherwise
+ */
+static int fuzzy_matchlines(const char *s1, size_t n1,
+			    const char *s2, size_t n2)
+{
+	const char *last1 = s1 + n1 - 1;
+	const char *last2 = s2 + n2 - 1;
+	int result = 0;
+
+	/* ignore line endings */
+	while ((*last1 == '\r') || (*last1 == '\n'))
+		last1--;
+	while ((*last2 == '\r') || (*last2 == '\n'))
+		last2--;
+
+	/* skip leading whitespaces, if both begin with whitespace */
+	if (s1 <= last1 && s2 <= last2 && isspace(*s1) && isspace(*s2)) {
+		while (isspace(*s1) && (s1 <= last1))
+			s1++;
+		while (isspace(*s2) && (s2 <= last2))
+			s2++;
+	}
+	/* early return if both lines are empty */
+	if ((s1 > last1) && (s2 > last2))
+		return 1;
+	while (!result) {
+		result = *s1++ - *s2++;
+		/*
+		 * Skip whitespace inside. We check for whitespace on
+		 * both buffers because we don't want "a b" to match
+		 * "ab"
+		 */
+		if (isspace(*s1) && isspace(*s2)) {
+			while (isspace(*s1) && s1 <= last1)
+				s1++;
+			while (isspace(*s2) && s2 <= last2)
+				s2++;
+		}
+		/*
+		 * If we reached the end on one side only,
+		 * lines don't match
+		 */
+		if (
+		    ((s2 > last2) && (s1 <= last1)) ||
+		    ((s1 > last1) && (s2 <= last2)))
+			return 0;
+		if ((s1 > last1) && (s2 > last2))
+			break;
+	}
+
+	return !result;
+}
+
+static void add_line_info(struct image *img, const char *bol, size_t len, unsigned flag)
+{
+	ALLOC_GROW(img->line_allocated, img->nr + 1, img->alloc);
+	img->line_allocated[img->nr].len = len;
+	img->line_allocated[img->nr].hash = hash_line(bol, len);
+	img->line_allocated[img->nr].flag = flag;
+	img->nr++;
+}
+
+/*
+ * "buf" has the file contents to be patched (read from various sources).
+ * attach it to "image" and add line-based index to it.
+ * "image" now owns the "buf".
+ */
+static void prepare_image(struct image *image, char *buf, size_t len,
+			  int prepare_linetable)
+{
+	const char *cp, *ep;
+
+	memset(image, 0, sizeof(*image));
+	image->buf = buf;
+	image->len = len;
+
+	if (!prepare_linetable)
+		return;
+
+	ep = image->buf + image->len;
+	cp = image->buf;
+	while (cp < ep) {
+		const char *next;
+		for (next = cp; next < ep && *next != '\n'; next++)
+			;
+		if (next < ep)
+			next++;
+		add_line_info(image, cp, next - cp, 0);
+		cp = next;
+	}
+	image->line = image->line_allocated;
+}
+
+static void clear_image(struct image *image)
+{
+	free(image->buf);
+	free(image->line_allocated);
+	memset(image, 0, sizeof(*image));
+}
+
+/* fmt must contain _one_ %s and no other substitution */
+static void say_patch_name(FILE *output, const char *fmt, struct patch *patch)
+{
+	struct strbuf sb = STRBUF_INIT;
+
+	if (patch->old_name && patch->new_name &&
+	    strcmp(patch->old_name, patch->new_name)) {
+		quote_c_style(patch->old_name, &sb, NULL, 0);
+		strbuf_addstr(&sb, " => ");
+		quote_c_style(patch->new_name, &sb, NULL, 0);
+	} else {
+		const char *n = patch->new_name;
+		if (!n)
+			n = patch->old_name;
+		quote_c_style(n, &sb, NULL, 0);
+	}
+	fprintf(output, fmt, sb.buf);
+	fputc('\n', output);
+	strbuf_release(&sb);
+}
+
+#define SLOP (16)
+
+static int read_patch_file(struct strbuf *sb, int fd)
+{
+	if (strbuf_read(sb, fd, 0) < 0)
+		return error_errno("git apply: failed to read");
+
+	/*
+	 * Make sure that we have some slop in the buffer
+	 * so that we can do speculative "memcmp" etc, and
+	 * see to it that it is NUL-filled.
+	 */
+	strbuf_grow(sb, SLOP);
+	memset(sb->buf + sb->len, 0, SLOP);
+	return 0;
+}
+
+static unsigned long linelen(const char *buffer, unsigned long size)
+{
+	unsigned long len = 0;
+	while (size--) {
+		len++;
+		if (*buffer++ == '\n')
+			break;
+	}
+	return len;
+}
+
+static int is_dev_null(const char *str)
+{
+	return skip_prefix(str, "/dev/null", &str) && isspace(*str);
+}
+
+#define TERM_SPACE	1
+#define TERM_TAB	2
+
+static int name_terminate(int c, int terminate)
+{
+	if (c == ' ' && !(terminate & TERM_SPACE))
+		return 0;
+	if (c == '\t' && !(terminate & TERM_TAB))
+		return 0;
+
+	return 1;
+}
+
+/* remove double slashes to make --index work with such filenames */
+static char *squash_slash(char *name)
+{
+	int i = 0, j = 0;
+
+	if (!name)
+		return NULL;
+
+	while (name[i]) {
+		if ((name[j++] = name[i++]) == '/')
+			while (name[i] == '/')
+				i++;
+	}
+	name[j] = '\0';
+	return name;
+}
+
+static char *find_name_gnu(struct apply_state *state,
+			   const char *line,
+			   const char *def,
+			   int p_value)
+{
+	struct strbuf name = STRBUF_INIT;
+	char *cp;
+
+	/*
+	 * Proposed "new-style" GNU patch/diff format; see
+	 * http://marc.info/?l=git&m=112927316408690&w=2
+	 */
+	if (unquote_c_style(&name, line, NULL)) {
+		strbuf_release(&name);
+		return NULL;
+	}
+
+	for (cp = name.buf; p_value; p_value--) {
+		cp = strchr(cp, '/');
+		if (!cp) {
+			strbuf_release(&name);
+			return NULL;
+		}
+		cp++;
+	}
+
+	strbuf_remove(&name, 0, cp - name.buf);
+	if (state->root.len)
+		strbuf_insert(&name, 0, state->root.buf, state->root.len);
+	return squash_slash(strbuf_detach(&name, NULL));
+}
+
+static size_t sane_tz_len(const char *line, size_t len)
+{
+	const char *tz, *p;
+
+	if (len < strlen(" +0500") || line[len-strlen(" +0500")] != ' ')
+		return 0;
+	tz = line + len - strlen(" +0500");
+
+	if (tz[1] != '+' && tz[1] != '-')
+		return 0;
+
+	for (p = tz + 2; p != line + len; p++)
+		if (!isdigit(*p))
+			return 0;
+
+	return line + len - tz;
+}
+
+static size_t tz_with_colon_len(const char *line, size_t len)
+{
+	const char *tz, *p;
+
+	if (len < strlen(" +08:00") || line[len - strlen(":00")] != ':')
+		return 0;
+	tz = line + len - strlen(" +08:00");
+
+	if (tz[0] != ' ' || (tz[1] != '+' && tz[1] != '-'))
+		return 0;
+	p = tz + 2;
+	if (!isdigit(*p++) || !isdigit(*p++) || *p++ != ':' ||
+	    !isdigit(*p++) || !isdigit(*p++))
+		return 0;
+
+	return line + len - tz;
+}
+
+static size_t date_len(const char *line, size_t len)
+{
+	const char *date, *p;
+
+	if (len < strlen("72-02-05") || line[len-strlen("-05")] != '-')
+		return 0;
+	p = date = line + len - strlen("72-02-05");
+
+	if (!isdigit(*p++) || !isdigit(*p++) || *p++ != '-' ||
+	    !isdigit(*p++) || !isdigit(*p++) || *p++ != '-' ||
+	    !isdigit(*p++) || !isdigit(*p++))	/* Not a date. */
+		return 0;
+
+	if (date - line >= strlen("19") &&
+	    isdigit(date[-1]) && isdigit(date[-2]))	/* 4-digit year */
+		date -= strlen("19");
+
+	return line + len - date;
+}
+
+static size_t short_time_len(const char *line, size_t len)
+{
+	const char *time, *p;
+
+	if (len < strlen(" 07:01:32") || line[len-strlen(":32")] != ':')
+		return 0;
+	p = time = line + len - strlen(" 07:01:32");
+
+	/* Permit 1-digit hours? */
+	if (*p++ != ' ' ||
+	    !isdigit(*p++) || !isdigit(*p++) || *p++ != ':' ||
+	    !isdigit(*p++) || !isdigit(*p++) || *p++ != ':' ||
+	    !isdigit(*p++) || !isdigit(*p++))	/* Not a time. */
+		return 0;
+
+	return line + len - time;
+}
+
+static size_t fractional_time_len(const char *line, size_t len)
+{
+	const char *p;
+	size_t n;
+
+	/* Expected format: 19:41:17.620000023 */
+	if (!len || !isdigit(line[len - 1]))
+		return 0;
+	p = line + len - 1;
+
+	/* Fractional seconds. */
+	while (p > line && isdigit(*p))
+		p--;
+	if (*p != '.')
+		return 0;
+
+	/* Hours, minutes, and whole seconds. */
+	n = short_time_len(line, p - line);
+	if (!n)
+		return 0;
+
+	return line + len - p + n;
+}
+
+static size_t trailing_spaces_len(const char *line, size_t len)
+{
+	const char *p;
+
+	/* Expected format: ' ' x (1 or more)  */
+	if (!len || line[len - 1] != ' ')
+		return 0;
+
+	p = line + len;
+	while (p != line) {
+		p--;
+		if (*p != ' ')
+			return line + len - (p + 1);
+	}
+
+	/* All spaces! */
+	return len;
+}
+
+static size_t diff_timestamp_len(const char *line, size_t len)
+{
+	const char *end = line + len;
+	size_t n;
+
+	/*
+	 * Posix: 2010-07-05 19:41:17
+	 * GNU: 2010-07-05 19:41:17.620000023 -0500
+	 */
+
+	if (!isdigit(end[-1]))
+		return 0;
+
+	n = sane_tz_len(line, end - line);
+	if (!n)
+		n = tz_with_colon_len(line, end - line);
+	end -= n;
+
+	n = short_time_len(line, end - line);
+	if (!n)
+		n = fractional_time_len(line, end - line);
+	end -= n;
+
+	n = date_len(line, end - line);
+	if (!n)	/* No date.  Too bad. */
+		return 0;
+	end -= n;
+
+	if (end == line)	/* No space before date. */
+		return 0;
+	if (end[-1] == '\t') {	/* Success! */
+		end--;
+		return line + len - end;
+	}
+	if (end[-1] != ' ')	/* No space before date. */
+		return 0;
+
+	/* Whitespace damage. */
+	end -= trailing_spaces_len(line, end - line);
+	return line + len - end;
+}
+
+static char *find_name_common(struct apply_state *state,
+			      const char *line,
+			      const char *def,
+			      int p_value,
+			      const char *end,
+			      int terminate)
+{
+	int len;
+	const char *start = NULL;
+
+	if (p_value == 0)
+		start = line;
+	while (line != end) {
+		char c = *line;
+
+		if (!end && isspace(c)) {
+			if (c == '\n')
+				break;
+			if (name_terminate(c, terminate))
+				break;
+		}
+		line++;
+		if (c == '/' && !--p_value)
+			start = line;
+	}
+	if (!start)
+		return squash_slash(xstrdup_or_null(def));
+	len = line - start;
+	if (!len)
+		return squash_slash(xstrdup_or_null(def));
+
+	/*
+	 * Generally we prefer the shorter name, especially
+	 * if the other one is just a variation of that with
+	 * something else tacked on to the end (ie "file.orig"
+	 * or "file~").
+	 */
+	if (def) {
+		int deflen = strlen(def);
+		if (deflen < len && !strncmp(start, def, deflen))
+			return squash_slash(xstrdup(def));
+	}
+
+	if (state->root.len) {
+		char *ret = xstrfmt("%s%.*s", state->root.buf, len, start);
+		return squash_slash(ret);
+	}
+
+	return squash_slash(xmemdupz(start, len));
+}
+
+static char *find_name(struct apply_state *state,
+		       const char *line,
+		       char *def,
+		       int p_value,
+		       int terminate)
+{
+	if (*line == '"') {
+		char *name = find_name_gnu(state, line, def, p_value);
+		if (name)
+			return name;
+	}
+
+	return find_name_common(state, line, def, p_value, NULL, terminate);
+}
+
+static char *find_name_traditional(struct apply_state *state,
+				   const char *line,
+				   char *def,
+				   int p_value)
+{
+	size_t len;
+	size_t date_len;
+
+	if (*line == '"') {
+		char *name = find_name_gnu(state, line, def, p_value);
+		if (name)
+			return name;
+	}
+
+	len = strchrnul(line, '\n') - line;
+	date_len = diff_timestamp_len(line, len);
+	if (!date_len)
+		return find_name_common(state, line, def, p_value, NULL, TERM_TAB);
+	len -= date_len;
+
+	return find_name_common(state, line, def, p_value, line + len, 0);
+}
+
+static int count_slashes(const char *cp)
+{
+	int cnt = 0;
+	char ch;
+
+	while ((ch = *cp++))
+		if (ch == '/')
+			cnt++;
+	return cnt;
+}
+
+/*
+ * Given the string after "--- " or "+++ ", guess the appropriate
+ * p_value for the given patch.
+ */
+static int guess_p_value(struct apply_state *state, const char *nameline)
+{
+	char *name, *cp;
+	int val = -1;
+
+	if (is_dev_null(nameline))
+		return -1;
+	name = find_name_traditional(state, nameline, NULL, 0);
+	if (!name)
+		return -1;
+	cp = strchr(name, '/');
+	if (!cp)
+		val = 0;
+	else if (state->prefix) {
+		/*
+		 * Does it begin with "a/$our-prefix" and such?  Then this is
+		 * very likely to apply to our directory.
+		 */
+		if (!strncmp(name, state->prefix, state->prefix_length))
+			val = count_slashes(state->prefix);
+		else {
+			cp++;
+			if (!strncmp(cp, state->prefix, state->prefix_length))
+				val = count_slashes(state->prefix) + 1;
+		}
+	}
+	free(name);
+	return val;
+}
+
+/*
+ * Does the ---/+++ line have the POSIX timestamp after the last HT?
+ * GNU diff puts epoch there to signal a creation/deletion event.  Is
+ * this such a timestamp?
+ */
+static int has_epoch_timestamp(const char *nameline)
+{
+	/*
+	 * We are only interested in epoch timestamp; any non-zero
+	 * fraction cannot be one, hence "(\.0+)?" in the regexp below.
+	 * For the same reason, the date must be either 1969-12-31 or
+	 * 1970-01-01, and the seconds part must be "00".
+	 */
+	const char stamp_regexp[] =
+		"^(1969-12-31|1970-01-01)"
+		" "
+		"[0-2][0-9]:[0-5][0-9]:00(\\.0+)?"
+		" "
+		"([-+][0-2][0-9]:?[0-5][0-9])\n";
+	const char *timestamp = NULL, *cp, *colon;
+	static regex_t *stamp;
+	regmatch_t m[10];
+	int zoneoffset;
+	int hourminute;
+	int status;
+
+	for (cp = nameline; *cp != '\n'; cp++) {
+		if (*cp == '\t')
+			timestamp = cp + 1;
+	}
+	if (!timestamp)
+		return 0;
+	if (!stamp) {
+		stamp = xmalloc(sizeof(*stamp));
+		if (regcomp(stamp, stamp_regexp, REG_EXTENDED)) {
+			warning(_("Cannot prepare timestamp regexp %s"),
+				stamp_regexp);
+			return 0;
+		}
+	}
+
+	status = regexec(stamp, timestamp, ARRAY_SIZE(m), m, 0);
+	if (status) {
+		if (status != REG_NOMATCH)
+			warning(_("regexec returned %d for input: %s"),
+				status, timestamp);
+		return 0;
+	}
+
+	zoneoffset = strtol(timestamp + m[3].rm_so + 1, (char **) &colon, 10);
+	if (*colon == ':')
+		zoneoffset = zoneoffset * 60 + strtol(colon + 1, NULL, 10);
+	else
+		zoneoffset = (zoneoffset / 100) * 60 + (zoneoffset % 100);
+	if (timestamp[m[3].rm_so] == '-')
+		zoneoffset = -zoneoffset;
+
+	/*
+	 * YYYY-MM-DD hh:mm:ss must be from either 1969-12-31
+	 * (west of GMT) or 1970-01-01 (east of GMT)
+	 */
+	if ((zoneoffset < 0 && memcmp(timestamp, "1969-12-31", 10)) ||
+	    (0 <= zoneoffset && memcmp(timestamp, "1970-01-01", 10)))
+		return 0;
+
+	hourminute = (strtol(timestamp + 11, NULL, 10) * 60 +
+		      strtol(timestamp + 14, NULL, 10) -
+		      zoneoffset);
+
+	return ((zoneoffset < 0 && hourminute == 1440) ||
+		(0 <= zoneoffset && !hourminute));
+}
+
+/*
+ * Get the name etc info from the ---/+++ lines of a traditional patch header
+ *
+ * FIXME! The end-of-filename heuristics are kind of screwy. For existing
+ * files, we can happily check the index for a match, but for creating a
+ * new file we should try to match whatever "patch" does. I have no idea.
+ */
+static int parse_traditional_patch(struct apply_state *state,
+				   const char *first,
+				   const char *second,
+				   struct patch *patch)
+{
+	char *name;
+
+	first += 4;	/* skip "--- " */
+	second += 4;	/* skip "+++ " */
+	if (!state->p_value_known) {
+		int p, q;
+		p = guess_p_value(state, first);
+		q = guess_p_value(state, second);
+		if (p < 0) p = q;
+		if (0 <= p && p == q) {
+			state->p_value = p;
+			state->p_value_known = 1;
+		}
+	}
+	if (is_dev_null(first)) {
+		patch->is_new = 1;
+		patch->is_delete = 0;
+		name = find_name_traditional(state, second, NULL, state->p_value);
+		patch->new_name = name;
+	} else if (is_dev_null(second)) {
+		patch->is_new = 0;
+		patch->is_delete = 1;
+		name = find_name_traditional(state, first, NULL, state->p_value);
+		patch->old_name = name;
+	} else {
+		char *first_name;
+		first_name = find_name_traditional(state, first, NULL, state->p_value);
+		name = find_name_traditional(state, second, first_name, state->p_value);
+		free(first_name);
+		if (has_epoch_timestamp(first)) {
+			patch->is_new = 1;
+			patch->is_delete = 0;
+			patch->new_name = name;
+		} else if (has_epoch_timestamp(second)) {
+			patch->is_new = 0;
+			patch->is_delete = 1;
+			patch->old_name = name;
+		} else {
+			patch->old_name = name;
+			patch->new_name = xstrdup_or_null(name);
+		}
+	}
+	if (!name)
+		return error(_("unable to find filename in patch at line %d"), state->linenr);
+
+	return 0;
+}
+
+static int gitdiff_hdrend(struct apply_state *state,
+			  const char *line,
+			  struct patch *patch)
+{
+	return 1;
+}
+
+/*
+ * We're anal about diff header consistency, to make
+ * sure that we don't end up having strange ambiguous
+ * patches floating around.
+ *
+ * As a result, gitdiff_{old|new}name() will check
+ * their names against any previous information, just
+ * to make sure..
+ */
+#define DIFF_OLD_NAME 0
+#define DIFF_NEW_NAME 1
+
+static int gitdiff_verify_name(struct apply_state *state,
+			       const char *line,
+			       int isnull,
+			       char **name,
+			       int side)
+{
+	if (!*name && !isnull) {
+		*name = find_name(state, line, NULL, state->p_value, TERM_TAB);
+		return 0;
+	}
+
+	if (*name) {
+		int len = strlen(*name);
+		char *another;
+		if (isnull)
+			return error(_("git apply: bad git-diff - expected /dev/null, got %s on line %d"),
+				     *name, state->linenr);
+		another = find_name(state, line, NULL, state->p_value, TERM_TAB);
+		if (!another || memcmp(another, *name, len + 1)) {
+			free(another);
+			return error((side == DIFF_NEW_NAME) ?
+			    _("git apply: bad git-diff - inconsistent new filename on line %d") :
+			    _("git apply: bad git-diff - inconsistent old filename on line %d"), state->linenr);
+		}
+		free(another);
+	} else {
+		/* expect "/dev/null" */
+		if (memcmp("/dev/null", line, 9) || line[9] != '\n')
+			return error(_("git apply: bad git-diff - expected /dev/null on line %d"), state->linenr);
+	}
+
+	return 0;
+}
+
+static int gitdiff_oldname(struct apply_state *state,
+			   const char *line,
+			   struct patch *patch)
+{
+	return gitdiff_verify_name(state, line,
+				   patch->is_new, &patch->old_name,
+				   DIFF_OLD_NAME);
+}
+
+static int gitdiff_newname(struct apply_state *state,
+			   const char *line,
+			   struct patch *patch)
+{
+	return gitdiff_verify_name(state, line,
+				   patch->is_delete, &patch->new_name,
+				   DIFF_NEW_NAME);
+}
+
+static int gitdiff_oldmode(struct apply_state *state,
+			   const char *line,
+			   struct patch *patch)
+{
+	patch->old_mode = strtoul(line, NULL, 8);
+	return 0;
+}
+
+static int gitdiff_newmode(struct apply_state *state,
+			   const char *line,
+			   struct patch *patch)
+{
+	patch->new_mode = strtoul(line, NULL, 8);
+	return 0;
+}
+
+static int gitdiff_delete(struct apply_state *state,
+			  const char *line,
+			  struct patch *patch)
+{
+	patch->is_delete = 1;
+	free(patch->old_name);
+	patch->old_name = xstrdup_or_null(patch->def_name);
+	return gitdiff_oldmode(state, line, patch);
+}
+
+static int gitdiff_newfile(struct apply_state *state,
+			   const char *line,
+			   struct patch *patch)
+{
+	patch->is_new = 1;
+	free(patch->new_name);
+	patch->new_name = xstrdup_or_null(patch->def_name);
+	return gitdiff_newmode(state, line, patch);
+}
+
+static int gitdiff_copysrc(struct apply_state *state,
+			   const char *line,
+			   struct patch *patch)
+{
+	patch->is_copy = 1;
+	free(patch->old_name);
+	patch->old_name = find_name(state, line, NULL, state->p_value ? state->p_value - 1 : 0, 0);
+	return 0;
+}
+
+static int gitdiff_copydst(struct apply_state *state,
+			   const char *line,
+			   struct patch *patch)
+{
+	patch->is_copy = 1;
+	free(patch->new_name);
+	patch->new_name = find_name(state, line, NULL, state->p_value ? state->p_value - 1 : 0, 0);
+	return 0;
+}
+
+static int gitdiff_renamesrc(struct apply_state *state,
+			     const char *line,
+			     struct patch *patch)
+{
+	patch->is_rename = 1;
+	free(patch->old_name);
+	patch->old_name = find_name(state, line, NULL, state->p_value ? state->p_value - 1 : 0, 0);
+	return 0;
+}
+
+static int gitdiff_renamedst(struct apply_state *state,
+			     const char *line,
+			     struct patch *patch)
+{
+	patch->is_rename = 1;
+	free(patch->new_name);
+	patch->new_name = find_name(state, line, NULL, state->p_value ? state->p_value - 1 : 0, 0);
+	return 0;
+}
+
+static int gitdiff_similarity(struct apply_state *state,
+			      const char *line,
+			      struct patch *patch)
+{
+	unsigned long val = strtoul(line, NULL, 10);
+	if (val <= 100)
+		patch->score = val;
+	return 0;
+}
+
+static int gitdiff_dissimilarity(struct apply_state *state,
+				 const char *line,
+				 struct patch *patch)
+{
+	unsigned long val = strtoul(line, NULL, 10);
+	if (val <= 100)
+		patch->score = val;
+	return 0;
+}
+
+static int gitdiff_index(struct apply_state *state,
+			 const char *line,
+			 struct patch *patch)
+{
+	/*
+	 * index line is N hexadecimal, "..", N hexadecimal,
+	 * and optional space with octal mode.
+	 */
+	const char *ptr, *eol;
+	int len;
+
+	ptr = strchr(line, '.');
+	if (!ptr || ptr[1] != '.' || 40 < ptr - line)
+		return 0;
+	len = ptr - line;
+	memcpy(patch->old_sha1_prefix, line, len);
+	patch->old_sha1_prefix[len] = 0;
+
+	line = ptr + 2;
+	ptr = strchr(line, ' ');
+	eol = strchrnul(line, '\n');
+
+	if (!ptr || eol < ptr)
+		ptr = eol;
+	len = ptr - line;
+
+	if (40 < len)
+		return 0;
+	memcpy(patch->new_sha1_prefix, line, len);
+	patch->new_sha1_prefix[len] = 0;
+	if (*ptr == ' ')
+		patch->old_mode = strtoul(ptr+1, NULL, 8);
+	return 0;
+}
+
+/*
+ * This is normal for a diff that doesn't change anything: we'll fall through
+ * into the next diff. Tell the parser to break out.
+ */
+static int gitdiff_unrecognized(struct apply_state *state,
+				const char *line,
+				struct patch *patch)
+{
+	return 1;
+}
+
+/*
+ * Skip p_value leading components from "line"; as we do not accept
+ * absolute paths, return NULL in that case.
+ */
+static const char *skip_tree_prefix(struct apply_state *state,
+				    const char *line,
+				    int llen)
+{
+	int nslash;
+	int i;
+
+	if (!state->p_value)
+		return (llen && line[0] == '/') ? NULL : line;
+
+	nslash = state->p_value;
+	for (i = 0; i < llen; i++) {
+		int ch = line[i];
+		if (ch == '/' && --nslash <= 0)
+			return (i == 0) ? NULL : &line[i + 1];
+	}
+	return NULL;
+}
+
+/*
+ * This is to extract the same name that appears on "diff --git"
+ * line.  We do not find and return anything if it is a rename
+ * patch, and it is OK because we will find the name elsewhere.
+ * We need to reliably find name only when it is mode-change only,
+ * creation or deletion of an empty file.  In any of these cases,
+ * both sides are the same name under a/ and b/ respectively.
+ */
+static char *git_header_name(struct apply_state *state,
+			     const char *line,
+			     int llen)
+{
+	const char *name;
+	const char *second = NULL;
+	size_t len, line_len;
+
+	line += strlen("diff --git ");
+	llen -= strlen("diff --git ");
+
+	if (*line == '"') {
+		const char *cp;
+		struct strbuf first = STRBUF_INIT;
+		struct strbuf sp = STRBUF_INIT;
+
+		if (unquote_c_style(&first, line, &second))
+			goto free_and_fail1;
+
+		/* strip the a/b prefix including trailing slash */
+		cp = skip_tree_prefix(state, first.buf, first.len);
+		if (!cp)
+			goto free_and_fail1;
+		strbuf_remove(&first, 0, cp - first.buf);
+
+		/*
+		 * second points at one past closing dq of name.
+		 * find the second name.
+		 */
+		while ((second < line + llen) && isspace(*second))
+			second++;
+
+		if (line + llen <= second)
+			goto free_and_fail1;
+		if (*second == '"') {
+			if (unquote_c_style(&sp, second, NULL))
+				goto free_and_fail1;
+			cp = skip_tree_prefix(state, sp.buf, sp.len);
+			if (!cp)
+				goto free_and_fail1;
+			/* They must match, otherwise ignore */
+			if (strcmp(cp, first.buf))
+				goto free_and_fail1;
+			strbuf_release(&sp);
+			return strbuf_detach(&first, NULL);
+		}
+
+		/* unquoted second */
+		cp = skip_tree_prefix(state, second, line + llen - second);
+		if (!cp)
+			goto free_and_fail1;
+		if (line + llen - cp != first.len ||
+		    memcmp(first.buf, cp, first.len))
+			goto free_and_fail1;
+		return strbuf_detach(&first, NULL);
+
+	free_and_fail1:
+		strbuf_release(&first);
+		strbuf_release(&sp);
+		return NULL;
+	}
+
+	/* unquoted first name */
+	name = skip_tree_prefix(state, line, llen);
+	if (!name)
+		return NULL;
+
+	/*
+	 * since the first name is unquoted, a dq if exists must be
+	 * the beginning of the second name.
+	 */
+	for (second = name; second < line + llen; second++) {
+		if (*second == '"') {
+			struct strbuf sp = STRBUF_INIT;
+			const char *np;
+
+			if (unquote_c_style(&sp, second, NULL))
+				goto free_and_fail2;
+
+			np = skip_tree_prefix(state, sp.buf, sp.len);
+			if (!np)
+				goto free_and_fail2;
+
+			len = sp.buf + sp.len - np;
+			if (len < second - name &&
+			    !strncmp(np, name, len) &&
+			    isspace(name[len])) {
+				/* Good */
+				strbuf_remove(&sp, 0, np - sp.buf);
+				return strbuf_detach(&sp, NULL);
+			}
+
+		free_and_fail2:
+			strbuf_release(&sp);
+			return NULL;
+		}
+	}
+
+	/*
+	 * Accept a name only if it shows up twice, exactly the same
+	 * form.
+	 */
+	second = strchr(name, '\n');
+	if (!second)
+		return NULL;
+	line_len = second - name;
+	for (len = 0 ; ; len++) {
+		switch (name[len]) {
+		default:
+			continue;
+		case '\n':
+			return NULL;
+		case '\t': case ' ':
+			/*
+			 * Is this the separator between the preimage
+			 * and the postimage pathname?  Again, we are
+			 * only interested in the case where there is
+			 * no rename, as this is only to set def_name
+			 * and a rename patch has the names elsewhere
+			 * in an unambiguous form.
+			 */
+			if (!name[len + 1])
+				return NULL; /* no postimage name */
+			second = skip_tree_prefix(state, name + len + 1,
+						  line_len - (len + 1));
+			if (!second)
+				return NULL;
+			/*
+			 * Does len bytes starting at "name" and "second"
+			 * (that are separated by one HT or SP we just
+			 * found) exactly match?
+			 */
+			if (second[len] == '\n' && !strncmp(name, second, len))
+				return xmemdupz(name, len);
+		}
+	}
+}
+
+/* Verify that we recognize the lines following a git header */
+static int parse_git_header(struct apply_state *state,
+			    const char *line,
+			    int len,
+			    unsigned int size,
+			    struct patch *patch)
+{
+	unsigned long offset;
+
+	/* A git diff has explicit new/delete information, so we don't guess */
+	patch->is_new = 0;
+	patch->is_delete = 0;
+
+	/*
+	 * Some things may not have the old name in the
+	 * rest of the headers anywhere (pure mode changes,
+	 * or removing or adding empty files), so we get
+	 * the default name from the header.
+	 */
+	patch->def_name = git_header_name(state, line, len);
+	if (patch->def_name && state->root.len) {
+		char *s = xstrfmt("%s%s", state->root.buf, patch->def_name);
+		free(patch->def_name);
+		patch->def_name = s;
+	}
+
+	line += len;
+	size -= len;
+	state->linenr++;
+	for (offset = len ; size > 0 ; offset += len, size -= len, line += len, state->linenr++) {
+		static const struct opentry {
+			const char *str;
+			int (*fn)(struct apply_state *, const char *, struct patch *);
+		} optable[] = {
+			{ "@@ -", gitdiff_hdrend },
+			{ "--- ", gitdiff_oldname },
+			{ "+++ ", gitdiff_newname },
+			{ "old mode ", gitdiff_oldmode },
+			{ "new mode ", gitdiff_newmode },
+			{ "deleted file mode ", gitdiff_delete },
+			{ "new file mode ", gitdiff_newfile },
+			{ "copy from ", gitdiff_copysrc },
+			{ "copy to ", gitdiff_copydst },
+			{ "rename old ", gitdiff_renamesrc },
+			{ "rename new ", gitdiff_renamedst },
+			{ "rename from ", gitdiff_renamesrc },
+			{ "rename to ", gitdiff_renamedst },
+			{ "similarity index ", gitdiff_similarity },
+			{ "dissimilarity index ", gitdiff_dissimilarity },
+			{ "index ", gitdiff_index },
+			{ "", gitdiff_unrecognized },
+		};
+		int i;
+
+		len = linelen(line, size);
+		if (!len || line[len-1] != '\n')
+			break;
+		for (i = 0; i < ARRAY_SIZE(optable); i++) {
+			const struct opentry *p = optable + i;
+			int oplen = strlen(p->str);
+			int res;
+			if (len < oplen || memcmp(p->str, line, oplen))
+				continue;
+			res = p->fn(state, line + oplen, patch);
+			if (res < 0)
+				return -1;
+			if (res > 0)
+				return offset;
+			break;
+		}
+	}
+
+	return offset;
+}
+
+static int parse_num(const char *line, unsigned long *p)
+{
+	char *ptr;
+
+	if (!isdigit(*line))
+		return 0;
+	*p = strtoul(line, &ptr, 10);
+	return ptr - line;
+}
+
+static int parse_range(const char *line, int len, int offset, const char *expect,
+		       unsigned long *p1, unsigned long *p2)
+{
+	int digits, ex;
+
+	if (offset < 0 || offset >= len)
+		return -1;
+	line += offset;
+	len -= offset;
+
+	digits = parse_num(line, p1);
+	if (!digits)
+		return -1;
+
+	offset += digits;
+	line += digits;
+	len -= digits;
+
+	*p2 = 1;
+	if (*line == ',') {
+		digits = parse_num(line+1, p2);
+		if (!digits)
+			return -1;
+
+		offset += digits+1;
+		line += digits+1;
+		len -= digits+1;
+	}
+
+	ex = strlen(expect);
+	if (ex > len)
+		return -1;
+	if (memcmp(line, expect, ex))
+		return -1;
+
+	return offset + ex;
+}
+
+static void recount_diff(const char *line, int size, struct fragment *fragment)
+{
+	int oldlines = 0, newlines = 0, ret = 0;
+
+	if (size < 1) {
+		warning("recount: ignore empty hunk");
+		return;
+	}
+
+	for (;;) {
+		int len = linelen(line, size);
+		size -= len;
+		line += len;
+
+		if (size < 1)
+			break;
+
+		switch (*line) {
+		case ' ': case '\n':
+			newlines++;
+			/* fall through */
+		case '-':
+			oldlines++;
+			continue;
+		case '+':
+			newlines++;
+			continue;
+		case '\\':
+			continue;
+		case '@':
+			ret = size < 3 || !starts_with(line, "@@ ");
+			break;
+		case 'd':
+			ret = size < 5 || !starts_with(line, "diff ");
+			break;
+		default:
+			ret = -1;
+			break;
+		}
+		if (ret) {
+			warning(_("recount: unexpected line: %.*s"),
+				(int)linelen(line, size), line);
+			return;
+		}
+		break;
+	}
+	fragment->oldlines = oldlines;
+	fragment->newlines = newlines;
+}
+
+/*
+ * Parse a unified diff fragment header of the
+ * form "@@ -a,b +c,d @@"
+ */
+static int parse_fragment_header(const char *line, int len, struct fragment *fragment)
+{
+	int offset;
+
+	if (!len || line[len-1] != '\n')
+		return -1;
+
+	/* Figure out the number of lines in a fragment */
+	offset = parse_range(line, len, 4, " +", &fragment->oldpos, &fragment->oldlines);
+	offset = parse_range(line, len, offset, " @@", &fragment->newpos, &fragment->newlines);
+
+	return offset;
+}
+
+/*
+ * Find file diff header
+ *
+ * Returns:
+ *  -1 if no header was found
+ *  -128 in case of error
+ *   the size of the header in bytes (called "offset") otherwise
+ */
+static int find_header(struct apply_state *state,
+		       const char *line,
+		       unsigned long size,
+		       int *hdrsize,
+		       struct patch *patch)
+{
+	unsigned long offset, len;
+
+	patch->is_toplevel_relative = 0;
+	patch->is_rename = patch->is_copy = 0;
+	patch->is_new = patch->is_delete = -1;
+	patch->old_mode = patch->new_mode = 0;
+	patch->old_name = patch->new_name = NULL;
+	for (offset = 0; size > 0; offset += len, size -= len, line += len, state->linenr++) {
+		unsigned long nextlen;
+
+		len = linelen(line, size);
+		if (!len)
+			break;
+
+		/* Testing this early allows us to take a few shortcuts.. */
+		if (len < 6)
+			continue;
+
+		/*
+		 * Make sure we don't find any unconnected patch fragments.
+		 * That's a sign that we didn't find a header, and that a
+		 * patch has become corrupted/broken up.
+		 */
+		if (!memcmp("@@ -", line, 4)) {
+			struct fragment dummy;
+			if (parse_fragment_header(line, len, &dummy) < 0)
+				continue;
+			error(_("patch fragment without header at line %d: %.*s"),
+				     state->linenr, (int)len-1, line);
+			return -128;
+		}
+
+		if (size < len + 6)
+			break;
+
+		/*
+		 * Git patch? It might not have a real patch, just a rename
+		 * or mode change, so we handle that specially
+		 */
+		if (!memcmp("diff --git ", line, 11)) {
+			int git_hdr_len = parse_git_header(state, line, len, size, patch);
+			if (git_hdr_len < 0)
+				return -128;
+			if (git_hdr_len <= len)
+				continue;
+			if (!patch->old_name && !patch->new_name) {
+				if (!patch->def_name) {
+					error(Q_("git diff header lacks filename information when removing "
+							"%d leading pathname component (line %d)",
+							"git diff header lacks filename information when removing "
+							"%d leading pathname components (line %d)",
+							state->p_value),
+						     state->p_value, state->linenr);
+					return -128;
+				}
+				patch->old_name = xstrdup(patch->def_name);
+				patch->new_name = xstrdup(patch->def_name);
+			}
+			if (!patch->is_delete && !patch->new_name) {
+				error("git diff header lacks filename information "
+					     "(line %d)", state->linenr);
+				return -128;
+			}
+			patch->is_toplevel_relative = 1;
+			*hdrsize = git_hdr_len;
+			return offset;
+		}
+
+		/* --- followed by +++ ? */
+		if (memcmp("--- ", line,  4) || memcmp("+++ ", line + len, 4))
+			continue;
+
+		/*
+		 * We only accept unified patches, so we want it to
+		 * at least have "@@ -a,b +c,d @@\n", which is 14 chars
+		 * minimum ("@@ -0,0 +1 @@\n" is the shortest).
+		 */
+		nextlen = linelen(line + len, size - len);
+		if (size < nextlen + 14 || memcmp("@@ -", line + len + nextlen, 4))
+			continue;
+
+		/* Ok, we'll consider it a patch */
+		if (parse_traditional_patch(state, line, line+len, patch))
+			return -128;
+		*hdrsize = len + nextlen;
+		state->linenr += 2;
+		return offset;
+	}
+	return -1;
+}
+
+static void record_ws_error(struct apply_state *state,
+			    unsigned result,
+			    const char *line,
+			    int len,
+			    int linenr)
+{
+	char *err;
+
+	if (!result)
+		return;
+
+	state->whitespace_error++;
+	if (state->squelch_whitespace_errors &&
+	    state->squelch_whitespace_errors < state->whitespace_error)
+		return;
+
+	err = whitespace_error_string(result);
+	if (state->apply_verbosity > verbosity_silent)
+		fprintf(stderr, "%s:%d: %s.\n%.*s\n",
+			state->patch_input_file, linenr, err, len, line);
+	free(err);
+}
+
+static void check_whitespace(struct apply_state *state,
+			     const char *line,
+			     int len,
+			     unsigned ws_rule)
+{
+	unsigned result = ws_check(line + 1, len - 1, ws_rule);
+
+	record_ws_error(state, result, line + 1, len - 2, state->linenr);
+}
+
+/*
+ * Parse a unified diff. Note that this really needs to parse each
+ * fragment separately, since the only way to know the difference
+ * between a "---" that is part of a patch, and a "---" that starts
+ * the next patch is to look at the line counts..
+ */
+static int parse_fragment(struct apply_state *state,
+			  const char *line,
+			  unsigned long size,
+			  struct patch *patch,
+			  struct fragment *fragment)
+{
+	int added, deleted;
+	int len = linelen(line, size), offset;
+	unsigned long oldlines, newlines;
+	unsigned long leading, trailing;
+
+	offset = parse_fragment_header(line, len, fragment);
+	if (offset < 0)
+		return -1;
+	if (offset > 0 && patch->recount)
+		recount_diff(line + offset, size - offset, fragment);
+	oldlines = fragment->oldlines;
+	newlines = fragment->newlines;
+	leading = 0;
+	trailing = 0;
+
+	/* Parse the thing.. */
+	line += len;
+	size -= len;
+	state->linenr++;
+	added = deleted = 0;
+	for (offset = len;
+	     0 < size;
+	     offset += len, size -= len, line += len, state->linenr++) {
+		if (!oldlines && !newlines)
+			break;
+		len = linelen(line, size);
+		if (!len || line[len-1] != '\n')
+			return -1;
+		switch (*line) {
+		default:
+			return -1;
+		case '\n': /* newer GNU diff, an empty context line */
+		case ' ':
+			oldlines--;
+			newlines--;
+			if (!deleted && !added)
+				leading++;
+			trailing++;
+			if (!state->apply_in_reverse &&
+			    state->ws_error_action == correct_ws_error)
+				check_whitespace(state, line, len, patch->ws_rule);
+			break;
+		case '-':
+			if (state->apply_in_reverse &&
+			    state->ws_error_action != nowarn_ws_error)
+				check_whitespace(state, line, len, patch->ws_rule);
+			deleted++;
+			oldlines--;
+			trailing = 0;
+			break;
+		case '+':
+			if (!state->apply_in_reverse &&
+			    state->ws_error_action != nowarn_ws_error)
+				check_whitespace(state, line, len, patch->ws_rule);
+			added++;
+			newlines--;
+			trailing = 0;
+			break;
+
+		/*
+		 * We allow "\ No newline at end of file". Depending
+		 * on locale settings when the patch was produced we
+		 * don't know what this line looks like. The only
+		 * thing we do know is that it begins with "\ ".
+		 * Checking for 12 is just for sanity check -- any
+		 * l10n of "\ No newline..." is at least that long.
+		 */
+		case '\\':
+			if (len < 12 || memcmp(line, "\\ ", 2))
+				return -1;
+			break;
+		}
+	}
+	if (oldlines || newlines)
+		return -1;
+	if (!deleted && !added)
+		return -1;
+
+	fragment->leading = leading;
+	fragment->trailing = trailing;
+
+	/*
+	 * If a fragment ends with an incomplete line, we failed to include
+	 * it in the above loop because we hit oldlines == newlines == 0
+	 * before seeing it.
+	 */
+	if (12 < size && !memcmp(line, "\\ ", 2))
+		offset += linelen(line, size);
+
+	patch->lines_added += added;
+	patch->lines_deleted += deleted;
+
+	if (0 < patch->is_new && oldlines)
+		return error(_("new file depends on old contents"));
+	if (0 < patch->is_delete && newlines)
+		return error(_("deleted file still has contents"));
+	return offset;
+}
+
+/*
+ * We have seen "diff --git a/... b/..." header (or a traditional patch
+ * header).  Read hunks that belong to this patch into fragments and hang
+ * them to the given patch structure.
+ *
+ * The (fragment->patch, fragment->size) pair points into the memory given
+ * by the caller, not a copy, when we return.
+ *
+ * Returns:
+ *   -1 in case of error,
+ *   the number of bytes in the patch otherwise.
+ */
+static int parse_single_patch(struct apply_state *state,
+			      const char *line,
+			      unsigned long size,
+			      struct patch *patch)
+{
+	unsigned long offset = 0;
+	unsigned long oldlines = 0, newlines = 0, context = 0;
+	struct fragment **fragp = &patch->fragments;
+
+	while (size > 4 && !memcmp(line, "@@ -", 4)) {
+		struct fragment *fragment;
+		int len;
+
+		fragment = xcalloc(1, sizeof(*fragment));
+		fragment->linenr = state->linenr;
+		len = parse_fragment(state, line, size, patch, fragment);
+		if (len <= 0) {
+			free(fragment);
+			return error(_("corrupt patch at line %d"), state->linenr);
+		}
+		fragment->patch = line;
+		fragment->size = len;
+		oldlines += fragment->oldlines;
+		newlines += fragment->newlines;
+		context += fragment->leading + fragment->trailing;
+
+		*fragp = fragment;
+		fragp = &fragment->next;
+
+		offset += len;
+		line += len;
+		size -= len;
+	}
+
+	/*
+	 * If something was removed (i.e. we have old-lines) it cannot
+	 * be creation, and if something was added it cannot be
+	 * deletion.  However, the reverse is not true; --unified=0
+	 * patches that only add are not necessarily creation even
+	 * though they do not have any old lines, and ones that only
+	 * delete are not necessarily deletion.
+	 *
+	 * Unfortunately, a real creation/deletion patch do _not_ have
+	 * any context line by definition, so we cannot safely tell it
+	 * apart with --unified=0 insanity.  At least if the patch has
+	 * more than one hunk it is not creation or deletion.
+	 */
+	if (patch->is_new < 0 &&
+	    (oldlines || (patch->fragments && patch->fragments->next)))
+		patch->is_new = 0;
+	if (patch->is_delete < 0 &&
+	    (newlines || (patch->fragments && patch->fragments->next)))
+		patch->is_delete = 0;
+
+	if (0 < patch->is_new && oldlines)
+		return error(_("new file %s depends on old contents"), patch->new_name);
+	if (0 < patch->is_delete && newlines)
+		return error(_("deleted file %s still has contents"), patch->old_name);
+	if (!patch->is_delete && !newlines && context && state->apply_verbosity > verbosity_silent)
+		fprintf_ln(stderr,
+			   _("** warning: "
+			     "file %s becomes empty but is not deleted"),
+			   patch->new_name);
+
+	return offset;
+}
+
+static inline int metadata_changes(struct patch *patch)
+{
+	return	patch->is_rename > 0 ||
+		patch->is_copy > 0 ||
+		patch->is_new > 0 ||
+		patch->is_delete ||
+		(patch->old_mode && patch->new_mode &&
+		 patch->old_mode != patch->new_mode);
+}
+
+static char *inflate_it(const void *data, unsigned long size,
+			unsigned long inflated_size)
+{
+	git_zstream stream;
+	void *out;
+	int st;
+
+	memset(&stream, 0, sizeof(stream));
+
+	stream.next_in = (unsigned char *)data;
+	stream.avail_in = size;
+	stream.next_out = out = xmalloc(inflated_size);
+	stream.avail_out = inflated_size;
+	git_inflate_init(&stream);
+	st = git_inflate(&stream, Z_FINISH);
+	git_inflate_end(&stream);
+	if ((st != Z_STREAM_END) || stream.total_out != inflated_size) {
+		free(out);
+		return NULL;
+	}
+	return out;
+}
+
+/*
+ * Read a binary hunk and return a new fragment; fragment->patch
+ * points at an allocated memory that the caller must free, so
+ * it is marked as "->free_patch = 1".
+ */
+static struct fragment *parse_binary_hunk(struct apply_state *state,
+					  char **buf_p,
+					  unsigned long *sz_p,
+					  int *status_p,
+					  int *used_p)
+{
+	/*
+	 * Expect a line that begins with binary patch method ("literal"
+	 * or "delta"), followed by the length of data before deflating.
+	 * a sequence of 'length-byte' followed by base-85 encoded data
+	 * should follow, terminated by a newline.
+	 *
+	 * Each 5-byte sequence of base-85 encodes up to 4 bytes,
+	 * and we would limit the patch line to 66 characters,
+	 * so one line can fit up to 13 groups that would decode
+	 * to 52 bytes max.  The length byte 'A'-'Z' corresponds
+	 * to 1-26 bytes, and 'a'-'z' corresponds to 27-52 bytes.
+	 */
+	int llen, used;
+	unsigned long size = *sz_p;
+	char *buffer = *buf_p;
+	int patch_method;
+	unsigned long origlen;
+	char *data = NULL;
+	int hunk_size = 0;
+	struct fragment *frag;
+
+	llen = linelen(buffer, size);
+	used = llen;
+
+	*status_p = 0;
+
+	if (starts_with(buffer, "delta ")) {
+		patch_method = BINARY_DELTA_DEFLATED;
+		origlen = strtoul(buffer + 6, NULL, 10);
+	}
+	else if (starts_with(buffer, "literal ")) {
+		patch_method = BINARY_LITERAL_DEFLATED;
+		origlen = strtoul(buffer + 8, NULL, 10);
+	}
+	else
+		return NULL;
+
+	state->linenr++;
+	buffer += llen;
+	while (1) {
+		int byte_length, max_byte_length, newsize;
+		llen = linelen(buffer, size);
+		used += llen;
+		state->linenr++;
+		if (llen == 1) {
+			/* consume the blank line */
+			buffer++;
+			size--;
+			break;
+		}
+		/*
+		 * Minimum line is "A00000\n" which is 7-byte long,
+		 * and the line length must be multiple of 5 plus 2.
+		 */
+		if ((llen < 7) || (llen-2) % 5)
+			goto corrupt;
+		max_byte_length = (llen - 2) / 5 * 4;
+		byte_length = *buffer;
+		if ('A' <= byte_length && byte_length <= 'Z')
+			byte_length = byte_length - 'A' + 1;
+		else if ('a' <= byte_length && byte_length <= 'z')
+			byte_length = byte_length - 'a' + 27;
+		else
+			goto corrupt;
+		/* if the input length was not multiple of 4, we would
+		 * have filler at the end but the filler should never
+		 * exceed 3 bytes
+		 */
+		if (max_byte_length < byte_length ||
+		    byte_length <= max_byte_length - 4)
+			goto corrupt;
+		newsize = hunk_size + byte_length;
+		data = xrealloc(data, newsize);
+		if (decode_85(data + hunk_size, buffer + 1, byte_length))
+			goto corrupt;
+		hunk_size = newsize;
+		buffer += llen;
+		size -= llen;
+	}
+
+	frag = xcalloc(1, sizeof(*frag));
+	frag->patch = inflate_it(data, hunk_size, origlen);
+	frag->free_patch = 1;
+	if (!frag->patch)
+		goto corrupt;
+	free(data);
+	frag->size = origlen;
+	*buf_p = buffer;
+	*sz_p = size;
+	*used_p = used;
+	frag->binary_patch_method = patch_method;
+	return frag;
+
+ corrupt:
+	free(data);
+	*status_p = -1;
+	error(_("corrupt binary patch at line %d: %.*s"),
+	      state->linenr-1, llen-1, buffer);
+	return NULL;
+}
+
+/*
+ * Returns:
+ *   -1 in case of error,
+ *   the length of the parsed binary patch otherwise
+ */
+static int parse_binary(struct apply_state *state,
+			char *buffer,
+			unsigned long size,
+			struct patch *patch)
+{
+	/*
+	 * We have read "GIT binary patch\n"; what follows is a line
+	 * that says the patch method (currently, either "literal" or
+	 * "delta") and the length of data before deflating; a
+	 * sequence of 'length-byte' followed by base-85 encoded data
+	 * follows.
+	 *
+	 * When a binary patch is reversible, there is another binary
+	 * hunk in the same format, starting with patch method (either
+	 * "literal" or "delta") with the length of data, and a sequence
+	 * of length-byte + base-85 encoded data, terminated with another
+	 * empty line.  This data, when applied to the postimage, produces
+	 * the preimage.
+	 */
+	struct fragment *forward;
+	struct fragment *reverse;
+	int status;
+	int used, used_1;
+
+	forward = parse_binary_hunk(state, &buffer, &size, &status, &used);
+	if (!forward && !status)
+		/* there has to be one hunk (forward hunk) */
+		return error(_("unrecognized binary patch at line %d"), state->linenr-1);
+	if (status)
+		/* otherwise we already gave an error message */
+		return status;
+
+	reverse = parse_binary_hunk(state, &buffer, &size, &status, &used_1);
+	if (reverse)
+		used += used_1;
+	else if (status) {
+		/*
+		 * Not having reverse hunk is not an error, but having
+		 * a corrupt reverse hunk is.
+		 */
+		free((void*) forward->patch);
+		free(forward);
+		return status;
+	}
+	forward->next = reverse;
+	patch->fragments = forward;
+	patch->is_binary = 1;
+	return used;
+}
+
+static void prefix_one(struct apply_state *state, char **name)
+{
+	char *old_name = *name;
+	if (!old_name)
+		return;
+	*name = xstrdup(prefix_filename(state->prefix, state->prefix_length, *name));
+	free(old_name);
+}
+
+static void prefix_patch(struct apply_state *state, struct patch *p)
+{
+	if (!state->prefix || p->is_toplevel_relative)
+		return;
+	prefix_one(state, &p->new_name);
+	prefix_one(state, &p->old_name);
+}
+
+/*
+ * include/exclude
+ */
+
+static void add_name_limit(struct apply_state *state,
+			   const char *name,
+			   int exclude)
+{
+	struct string_list_item *it;
+
+	it = string_list_append(&state->limit_by_name, name);
+	it->util = exclude ? NULL : (void *) 1;
+}
+
+static int use_patch(struct apply_state *state, struct patch *p)
+{
+	const char *pathname = p->new_name ? p->new_name : p->old_name;
+	int i;
+
+	/* Paths outside are not touched regardless of "--include" */
+	if (0 < state->prefix_length) {
+		int pathlen = strlen(pathname);
+		if (pathlen <= state->prefix_length ||
+		    memcmp(state->prefix, pathname, state->prefix_length))
+			return 0;
+	}
+
+	/* See if it matches any of exclude/include rule */
+	for (i = 0; i < state->limit_by_name.nr; i++) {
+		struct string_list_item *it = &state->limit_by_name.items[i];
+		if (!wildmatch(it->string, pathname, 0, NULL))
+			return (it->util != NULL);
+	}
+
+	/*
+	 * If we had any include, a path that does not match any rule is
+	 * not used.  Otherwise, we saw bunch of exclude rules (or none)
+	 * and such a path is used.
+	 */
+	return !state->has_include;
+}
+
+/*
+ * Read the patch text in "buffer" that extends for "size" bytes; stop
+ * reading after seeing a single patch (i.e. changes to a single file).
+ * Create fragments (i.e. patch hunks) and hang them to the given patch.
+ *
+ * Returns:
+ *   -1 if no header was found or parse_binary() failed,
+ *   -128 on another error,
+ *   the number of bytes consumed otherwise,
+ *     so that the caller can call us again for the next patch.
+ */
+static int parse_chunk(struct apply_state *state, char *buffer, unsigned long size, struct patch *patch)
+{
+	int hdrsize, patchsize;
+	int offset = find_header(state, buffer, size, &hdrsize, patch);
+
+	if (offset < 0)
+		return offset;
+
+	prefix_patch(state, patch);
+
+	if (!use_patch(state, patch))
+		patch->ws_rule = 0;
+	else
+		patch->ws_rule = whitespace_rule(patch->new_name
+						 ? patch->new_name
+						 : patch->old_name);
+
+	patchsize = parse_single_patch(state,
+				       buffer + offset + hdrsize,
+				       size - offset - hdrsize,
+				       patch);
+
+	if (patchsize < 0)
+		return -128;
+
+	if (!patchsize) {
+		static const char git_binary[] = "GIT binary patch\n";
+		int hd = hdrsize + offset;
+		unsigned long llen = linelen(buffer + hd, size - hd);
+
+		if (llen == sizeof(git_binary) - 1 &&
+		    !memcmp(git_binary, buffer + hd, llen)) {
+			int used;
+			state->linenr++;
+			used = parse_binary(state, buffer + hd + llen,
+					    size - hd - llen, patch);
+			if (used < 0)
+				return -1;
+			if (used)
+				patchsize = used + llen;
+			else
+				patchsize = 0;
+		}
+		else if (!memcmp(" differ\n", buffer + hd + llen - 8, 8)) {
+			static const char *binhdr[] = {
+				"Binary files ",
+				"Files ",
+				NULL,
+			};
+			int i;
+			for (i = 0; binhdr[i]; i++) {
+				int len = strlen(binhdr[i]);
+				if (len < size - hd &&
+				    !memcmp(binhdr[i], buffer + hd, len)) {
+					state->linenr++;
+					patch->is_binary = 1;
+					patchsize = llen;
+					break;
+				}
+			}
+		}
+
+		/* Empty patch cannot be applied if it is a text patch
+		 * without metadata change.  A binary patch appears
+		 * empty to us here.
+		 */
+		if ((state->apply || state->check) &&
+		    (!patch->is_binary && !metadata_changes(patch))) {
+			error(_("patch with only garbage at line %d"), state->linenr);
+			return -128;
+		}
+	}
+
+	return offset + hdrsize + patchsize;
+}
+
+#define swap(a,b) myswap((a),(b),sizeof(a))
+
+#define myswap(a, b, size) do {		\
+	unsigned char mytmp[size];	\
+	memcpy(mytmp, &a, size);		\
+	memcpy(&a, &b, size);		\
+	memcpy(&b, mytmp, size);		\
+} while (0)
+
+static void reverse_patches(struct patch *p)
+{
+	for (; p; p = p->next) {
+		struct fragment *frag = p->fragments;
+
+		swap(p->new_name, p->old_name);
+		swap(p->new_mode, p->old_mode);
+		swap(p->is_new, p->is_delete);
+		swap(p->lines_added, p->lines_deleted);
+		swap(p->old_sha1_prefix, p->new_sha1_prefix);
+
+		for (; frag; frag = frag->next) {
+			swap(frag->newpos, frag->oldpos);
+			swap(frag->newlines, frag->oldlines);
+		}
+	}
+}
+
+static const char pluses[] =
+"++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++";
+static const char minuses[]=
+"----------------------------------------------------------------------";
+
+static void show_stats(struct apply_state *state, struct patch *patch)
+{
+	struct strbuf qname = STRBUF_INIT;
+	char *cp = patch->new_name ? patch->new_name : patch->old_name;
+	int max, add, del;
+
+	quote_c_style(cp, &qname, NULL, 0);
+
+	/*
+	 * "scale" the filename
+	 */
+	max = state->max_len;
+	if (max > 50)
+		max = 50;
+
+	if (qname.len > max) {
+		cp = strchr(qname.buf + qname.len + 3 - max, '/');
+		if (!cp)
+			cp = qname.buf + qname.len + 3 - max;
+		strbuf_splice(&qname, 0, cp - qname.buf, "...", 3);
+	}
+
+	if (patch->is_binary) {
+		printf(" %-*s |  Bin\n", max, qname.buf);
+		strbuf_release(&qname);
+		return;
+	}
+
+	printf(" %-*s |", max, qname.buf);
+	strbuf_release(&qname);
+
+	/*
+	 * scale the add/delete
+	 */
+	max = max + state->max_change > 70 ? 70 - max : state->max_change;
+	add = patch->lines_added;
+	del = patch->lines_deleted;
+
+	if (state->max_change > 0) {
+		int total = ((add + del) * max + state->max_change / 2) / state->max_change;
+		add = (add * max + state->max_change / 2) / state->max_change;
+		del = total - add;
+	}
+	printf("%5d %.*s%.*s\n", patch->lines_added + patch->lines_deleted,
+		add, pluses, del, minuses);
+}
+
+static int read_old_data(struct stat *st, const char *path, struct strbuf *buf)
+{
+	switch (st->st_mode & S_IFMT) {
+	case S_IFLNK:
+		if (strbuf_readlink(buf, path, st->st_size) < 0)
+			return error(_("unable to read symlink %s"), path);
+		return 0;
+	case S_IFREG:
+		if (strbuf_read_file(buf, path, st->st_size) != st->st_size)
+			return error(_("unable to open or read %s"), path);
+		convert_to_git(path, buf->buf, buf->len, buf, 0);
+		return 0;
+	default:
+		return -1;
+	}
+}
+
+/*
+ * Update the preimage, and the common lines in postimage,
+ * from buffer buf of length len. If postlen is 0 the postimage
+ * is updated in place, otherwise it's updated on a new buffer
+ * of length postlen
+ */
+
+static void update_pre_post_images(struct image *preimage,
+				   struct image *postimage,
+				   char *buf,
+				   size_t len, size_t postlen)
+{
+	int i, ctx, reduced;
+	char *new, *old, *fixed;
+	struct image fixed_preimage;
+
+	/*
+	 * Update the preimage with whitespace fixes.  Note that we
+	 * are not losing preimage->buf -- apply_one_fragment() will
+	 * free "oldlines".
+	 */
+	prepare_image(&fixed_preimage, buf, len, 1);
+	assert(postlen
+	       ? fixed_preimage.nr == preimage->nr
+	       : fixed_preimage.nr <= preimage->nr);
+	for (i = 0; i < fixed_preimage.nr; i++)
+		fixed_preimage.line[i].flag = preimage->line[i].flag;
+	free(preimage->line_allocated);
+	*preimage = fixed_preimage;
+
+	/*
+	 * Adjust the common context lines in postimage. This can be
+	 * done in-place when we are shrinking it with whitespace
+	 * fixing, but needs a new buffer when ignoring whitespace or
+	 * expanding leading tabs to spaces.
+	 *
+	 * We trust the caller to tell us if the update can be done
+	 * in place (postlen==0) or not.
+	 */
+	old = postimage->buf;
+	if (postlen)
+		new = postimage->buf = xmalloc(postlen);
+	else
+		new = old;
+	fixed = preimage->buf;
+
+	for (i = reduced = ctx = 0; i < postimage->nr; i++) {
+		size_t l_len = postimage->line[i].len;
+		if (!(postimage->line[i].flag & LINE_COMMON)) {
+			/* an added line -- no counterparts in preimage */
+			memmove(new, old, l_len);
+			old += l_len;
+			new += l_len;
+			continue;
+		}
+
+		/* a common context -- skip it in the original postimage */
+		old += l_len;
+
+		/* and find the corresponding one in the fixed preimage */
+		while (ctx < preimage->nr &&
+		       !(preimage->line[ctx].flag & LINE_COMMON)) {
+			fixed += preimage->line[ctx].len;
+			ctx++;
+		}
+
+		/*
+		 * preimage is expected to run out, if the caller
+		 * fixed addition of trailing blank lines.
+		 */
+		if (preimage->nr <= ctx) {
+			reduced++;
+			continue;
+		}
+
+		/* and copy it in, while fixing the line length */
+		l_len = preimage->line[ctx].len;
+		memcpy(new, fixed, l_len);
+		new += l_len;
+		fixed += l_len;
+		postimage->line[i].len = l_len;
+		ctx++;
+	}
+
+	if (postlen
+	    ? postlen < new - postimage->buf
+	    : postimage->len < new - postimage->buf)
+		die("BUG: caller miscounted postlen: asked %d, orig = %d, used = %d",
+		    (int)postlen, (int) postimage->len, (int)(new - postimage->buf));
+
+	/* Fix the length of the whole thing */
+	postimage->len = new - postimage->buf;
+	postimage->nr -= reduced;
+}
+
+static int line_by_line_fuzzy_match(struct image *img,
+				    struct image *preimage,
+				    struct image *postimage,
+				    unsigned long try,
+				    int try_lno,
+				    int preimage_limit)
+{
+	int i;
+	size_t imgoff = 0;
+	size_t preoff = 0;
+	size_t postlen = postimage->len;
+	size_t extra_chars;
+	char *buf;
+	char *preimage_eof;
+	char *preimage_end;
+	struct strbuf fixed;
+	char *fixed_buf;
+	size_t fixed_len;
+
+	for (i = 0; i < preimage_limit; i++) {
+		size_t prelen = preimage->line[i].len;
+		size_t imglen = img->line[try_lno+i].len;
+
+		if (!fuzzy_matchlines(img->buf + try + imgoff, imglen,
+				      preimage->buf + preoff, prelen))
+			return 0;
+		if (preimage->line[i].flag & LINE_COMMON)
+			postlen += imglen - prelen;
+		imgoff += imglen;
+		preoff += prelen;
+	}
+
+	/*
+	 * Ok, the preimage matches with whitespace fuzz.
+	 *
+	 * imgoff now holds the true length of the target that
+	 * matches the preimage before the end of the file.
+	 *
+	 * Count the number of characters in the preimage that fall
+	 * beyond the end of the file and make sure that all of them
+	 * are whitespace characters. (This can only happen if
+	 * we are removing blank lines at the end of the file.)
+	 */
+	buf = preimage_eof = preimage->buf + preoff;
+	for ( ; i < preimage->nr; i++)
+		preoff += preimage->line[i].len;
+	preimage_end = preimage->buf + preoff;
+	for ( ; buf < preimage_end; buf++)
+		if (!isspace(*buf))
+			return 0;
+
+	/*
+	 * Update the preimage and the common postimage context
+	 * lines to use the same whitespace as the target.
+	 * If whitespace is missing in the target (i.e.
+	 * if the preimage extends beyond the end of the file),
+	 * use the whitespace from the preimage.
+	 */
+	extra_chars = preimage_end - preimage_eof;
+	strbuf_init(&fixed, imgoff + extra_chars);
+	strbuf_add(&fixed, img->buf + try, imgoff);
+	strbuf_add(&fixed, preimage_eof, extra_chars);
+	fixed_buf = strbuf_detach(&fixed, &fixed_len);
+	update_pre_post_images(preimage, postimage,
+			       fixed_buf, fixed_len, postlen);
+	return 1;
+}
+
+static int match_fragment(struct apply_state *state,
+			  struct image *img,
+			  struct image *preimage,
+			  struct image *postimage,
+			  unsigned long try,
+			  int try_lno,
+			  unsigned ws_rule,
+			  int match_beginning, int match_end)
+{
+	int i;
+	char *fixed_buf, *buf, *orig, *target;
+	struct strbuf fixed;
+	size_t fixed_len, postlen;
+	int preimage_limit;
+
+	if (preimage->nr + try_lno <= img->nr) {
+		/*
+		 * The hunk falls within the boundaries of img.
+		 */
+		preimage_limit = preimage->nr;
+		if (match_end && (preimage->nr + try_lno != img->nr))
+			return 0;
+	} else if (state->ws_error_action == correct_ws_error &&
+		   (ws_rule & WS_BLANK_AT_EOF)) {
+		/*
+		 * This hunk extends beyond the end of img, and we are
+		 * removing blank lines at the end of the file.  This
+		 * many lines from the beginning of the preimage must
+		 * match with img, and the remainder of the preimage
+		 * must be blank.
+		 */
+		preimage_limit = img->nr - try_lno;
+	} else {
+		/*
+		 * The hunk extends beyond the end of the img and
+		 * we are not removing blanks at the end, so we
+		 * should reject the hunk at this position.
+		 */
+		return 0;
+	}
+
+	if (match_beginning && try_lno)
+		return 0;
+
+	/* Quick hash check */
+	for (i = 0; i < preimage_limit; i++)
+		if ((img->line[try_lno + i].flag & LINE_PATCHED) ||
+		    (preimage->line[i].hash != img->line[try_lno + i].hash))
+			return 0;
+
+	if (preimage_limit == preimage->nr) {
+		/*
+		 * Do we have an exact match?  If we were told to match
+		 * at the end, size must be exactly at try+fragsize,
+		 * otherwise try+fragsize must be still within the preimage,
+		 * and either case, the old piece should match the preimage
+		 * exactly.
+		 */
+		if ((match_end
+		     ? (try + preimage->len == img->len)
+		     : (try + preimage->len <= img->len)) &&
+		    !memcmp(img->buf + try, preimage->buf, preimage->len))
+			return 1;
+	} else {
+		/*
+		 * The preimage extends beyond the end of img, so
+		 * there cannot be an exact match.
+		 *
+		 * There must be one non-blank context line that match
+		 * a line before the end of img.
+		 */
+		char *buf_end;
+
+		buf = preimage->buf;
+		buf_end = buf;
+		for (i = 0; i < preimage_limit; i++)
+			buf_end += preimage->line[i].len;
+
+		for ( ; buf < buf_end; buf++)
+			if (!isspace(*buf))
+				break;
+		if (buf == buf_end)
+			return 0;
+	}
+
+	/*
+	 * No exact match. If we are ignoring whitespace, run a line-by-line
+	 * fuzzy matching. We collect all the line length information because
+	 * we need it to adjust whitespace if we match.
+	 */
+	if (state->ws_ignore_action == ignore_ws_change)
+		return line_by_line_fuzzy_match(img, preimage, postimage,
+						try, try_lno, preimage_limit);
+
+	if (state->ws_error_action != correct_ws_error)
+		return 0;
+
+	/*
+	 * The hunk does not apply byte-by-byte, but the hash says
+	 * it might with whitespace fuzz. We weren't asked to
+	 * ignore whitespace, we were asked to correct whitespace
+	 * errors, so let's try matching after whitespace correction.
+	 *
+	 * While checking the preimage against the target, whitespace
+	 * errors in both fixed, we count how large the corresponding
+	 * postimage needs to be.  The postimage prepared by
+	 * apply_one_fragment() has whitespace errors fixed on added
+	 * lines already, but the common lines were propagated as-is,
+	 * which may become longer when their whitespace errors are
+	 * fixed.
+	 */
+
+	/* First count added lines in postimage */
+	postlen = 0;
+	for (i = 0; i < postimage->nr; i++) {
+		if (!(postimage->line[i].flag & LINE_COMMON))
+			postlen += postimage->line[i].len;
+	}
+
+	/*
+	 * The preimage may extend beyond the end of the file,
+	 * but in this loop we will only handle the part of the
+	 * preimage that falls within the file.
+	 */
+	strbuf_init(&fixed, preimage->len + 1);
+	orig = preimage->buf;
+	target = img->buf + try;
+	for (i = 0; i < preimage_limit; i++) {
+		size_t oldlen = preimage->line[i].len;
+		size_t tgtlen = img->line[try_lno + i].len;
+		size_t fixstart = fixed.len;
+		struct strbuf tgtfix;
+		int match;
+
+		/* Try fixing the line in the preimage */
+		ws_fix_copy(&fixed, orig, oldlen, ws_rule, NULL);
+
+		/* Try fixing the line in the target */
+		strbuf_init(&tgtfix, tgtlen);
+		ws_fix_copy(&tgtfix, target, tgtlen, ws_rule, NULL);
+
+		/*
+		 * If they match, either the preimage was based on
+		 * a version before our tree fixed whitespace breakage,
+		 * or we are lacking a whitespace-fix patch the tree
+		 * the preimage was based on already had (i.e. target
+		 * has whitespace breakage, the preimage doesn't).
+		 * In either case, we are fixing the whitespace breakages
+		 * so we might as well take the fix together with their
+		 * real change.
+		 */
+		match = (tgtfix.len == fixed.len - fixstart &&
+			 !memcmp(tgtfix.buf, fixed.buf + fixstart,
+					     fixed.len - fixstart));
+
+		/* Add the length if this is common with the postimage */
+		if (preimage->line[i].flag & LINE_COMMON)
+			postlen += tgtfix.len;
+
+		strbuf_release(&tgtfix);
+		if (!match)
+			goto unmatch_exit;
+
+		orig += oldlen;
+		target += tgtlen;
+	}
+
+
+	/*
+	 * Now handle the lines in the preimage that falls beyond the
+	 * end of the file (if any). They will only match if they are
+	 * empty or only contain whitespace (if WS_BLANK_AT_EOL is
+	 * false).
+	 */
+	for ( ; i < preimage->nr; i++) {
+		size_t fixstart = fixed.len; /* start of the fixed preimage */
+		size_t oldlen = preimage->line[i].len;
+		int j;
+
+		/* Try fixing the line in the preimage */
+		ws_fix_copy(&fixed, orig, oldlen, ws_rule, NULL);
+
+		for (j = fixstart; j < fixed.len; j++)
+			if (!isspace(fixed.buf[j]))
+				goto unmatch_exit;
+
+		orig += oldlen;
+	}
+
+	/*
+	 * Yes, the preimage is based on an older version that still
+	 * has whitespace breakages unfixed, and fixing them makes the
+	 * hunk match.  Update the context lines in the postimage.
+	 */
+	fixed_buf = strbuf_detach(&fixed, &fixed_len);
+	if (postlen < postimage->len)
+		postlen = 0;
+	update_pre_post_images(preimage, postimage,
+			       fixed_buf, fixed_len, postlen);
+	return 1;
+
+ unmatch_exit:
+	strbuf_release(&fixed);
+	return 0;
+}
+
+static int find_pos(struct apply_state *state,
+		    struct image *img,
+		    struct image *preimage,
+		    struct image *postimage,
+		    int line,
+		    unsigned ws_rule,
+		    int match_beginning, int match_end)
+{
+	int i;
+	unsigned long backwards, forwards, try;
+	int backwards_lno, forwards_lno, try_lno;
+
+	/*
+	 * If match_beginning or match_end is specified, there is no
+	 * point starting from a wrong line that will never match and
+	 * wander around and wait for a match at the specified end.
+	 */
+	if (match_beginning)
+		line = 0;
+	else if (match_end)
+		line = img->nr - preimage->nr;
+
+	/*
+	 * Because the comparison is unsigned, the following test
+	 * will also take care of a negative line number that can
+	 * result when match_end and preimage is larger than the target.
+	 */
+	if ((size_t) line > img->nr)
+		line = img->nr;
+
+	try = 0;
+	for (i = 0; i < line; i++)
+		try += img->line[i].len;
+
+	/*
+	 * There's probably some smart way to do this, but I'll leave
+	 * that to the smart and beautiful people. I'm simple and stupid.
+	 */
+	backwards = try;
+	backwards_lno = line;
+	forwards = try;
+	forwards_lno = line;
+	try_lno = line;
+
+	for (i = 0; ; i++) {
+		if (match_fragment(state, img, preimage, postimage,
+				   try, try_lno, ws_rule,
+				   match_beginning, match_end))
+			return try_lno;
+
+	again:
+		if (backwards_lno == 0 && forwards_lno == img->nr)
+			break;
+
+		if (i & 1) {
+			if (backwards_lno == 0) {
+				i++;
+				goto again;
+			}
+			backwards_lno--;
+			backwards -= img->line[backwards_lno].len;
+			try = backwards;
+			try_lno = backwards_lno;
+		} else {
+			if (forwards_lno == img->nr) {
+				i++;
+				goto again;
+			}
+			forwards += img->line[forwards_lno].len;
+			forwards_lno++;
+			try = forwards;
+			try_lno = forwards_lno;
+		}
+
+	}
+	return -1;
+}
+
+static void remove_first_line(struct image *img)
+{
+	img->buf += img->line[0].len;
+	img->len -= img->line[0].len;
+	img->line++;
+	img->nr--;
+}
+
+static void remove_last_line(struct image *img)
+{
+	img->len -= img->line[--img->nr].len;
+}
+
+/*
+ * The change from "preimage" and "postimage" has been found to
+ * apply at applied_pos (counts in line numbers) in "img".
+ * Update "img" to remove "preimage" and replace it with "postimage".
+ */
+static void update_image(struct apply_state *state,
+			 struct image *img,
+			 int applied_pos,
+			 struct image *preimage,
+			 struct image *postimage)
+{
+	/*
+	 * remove the copy of preimage at offset in img
+	 * and replace it with postimage
+	 */
+	int i, nr;
+	size_t remove_count, insert_count, applied_at = 0;
+	char *result;
+	int preimage_limit;
+
+	/*
+	 * If we are removing blank lines at the end of img,
+	 * the preimage may extend beyond the end.
+	 * If that is the case, we must be careful only to
+	 * remove the part of the preimage that falls within
+	 * the boundaries of img. Initialize preimage_limit
+	 * to the number of lines in the preimage that falls
+	 * within the boundaries.
+	 */
+	preimage_limit = preimage->nr;
+	if (preimage_limit > img->nr - applied_pos)
+		preimage_limit = img->nr - applied_pos;
+
+	for (i = 0; i < applied_pos; i++)
+		applied_at += img->line[i].len;
+
+	remove_count = 0;
+	for (i = 0; i < preimage_limit; i++)
+		remove_count += img->line[applied_pos + i].len;
+	insert_count = postimage->len;
+
+	/* Adjust the contents */
+	result = xmalloc(st_add3(st_sub(img->len, remove_count), insert_count, 1));
+	memcpy(result, img->buf, applied_at);
+	memcpy(result + applied_at, postimage->buf, postimage->len);
+	memcpy(result + applied_at + postimage->len,
+	       img->buf + (applied_at + remove_count),
+	       img->len - (applied_at + remove_count));
+	free(img->buf);
+	img->buf = result;
+	img->len += insert_count - remove_count;
+	result[img->len] = '\0';
+
+	/* Adjust the line table */
+	nr = img->nr + postimage->nr - preimage_limit;
+	if (preimage_limit < postimage->nr) {
+		/*
+		 * NOTE: this knows that we never call remove_first_line()
+		 * on anything other than pre/post image.
+		 */
+		REALLOC_ARRAY(img->line, nr);
+		img->line_allocated = img->line;
+	}
+	if (preimage_limit != postimage->nr)
+		memmove(img->line + applied_pos + postimage->nr,
+			img->line + applied_pos + preimage_limit,
+			(img->nr - (applied_pos + preimage_limit)) *
+			sizeof(*img->line));
+	memcpy(img->line + applied_pos,
+	       postimage->line,
+	       postimage->nr * sizeof(*img->line));
+	if (!state->allow_overlap)
+		for (i = 0; i < postimage->nr; i++)
+			img->line[applied_pos + i].flag |= LINE_PATCHED;
+	img->nr = nr;
+}
+
+/*
+ * Use the patch-hunk text in "frag" to prepare two images (preimage and
+ * postimage) for the hunk.  Find lines that match "preimage" in "img" and
+ * replace the part of "img" with "postimage" text.
+ */
+static int apply_one_fragment(struct apply_state *state,
+			      struct image *img, struct fragment *frag,
+			      int inaccurate_eof, unsigned ws_rule,
+			      int nth_fragment)
+{
+	int match_beginning, match_end;
+	const char *patch = frag->patch;
+	int size = frag->size;
+	char *old, *oldlines;
+	struct strbuf newlines;
+	int new_blank_lines_at_end = 0;
+	int found_new_blank_lines_at_end = 0;
+	int hunk_linenr = frag->linenr;
+	unsigned long leading, trailing;
+	int pos, applied_pos;
+	struct image preimage;
+	struct image postimage;
+
+	memset(&preimage, 0, sizeof(preimage));
+	memset(&postimage, 0, sizeof(postimage));
+	oldlines = xmalloc(size);
+	strbuf_init(&newlines, size);
+
+	old = oldlines;
+	while (size > 0) {
+		char first;
+		int len = linelen(patch, size);
+		int plen;
+		int added_blank_line = 0;
+		int is_blank_context = 0;
+		size_t start;
+
+		if (!len)
+			break;
+
+		/*
+		 * "plen" is how much of the line we should use for
+		 * the actual patch data. Normally we just remove the
+		 * first character on the line, but if the line is
+		 * followed by "\ No newline", then we also remove the
+		 * last one (which is the newline, of course).
+		 */
+		plen = len - 1;
+		if (len < size && patch[len] == '\\')
+			plen--;
+		first = *patch;
+		if (state->apply_in_reverse) {
+			if (first == '-')
+				first = '+';
+			else if (first == '+')
+				first = '-';
+		}
+
+		switch (first) {
+		case '\n':
+			/* Newer GNU diff, empty context line */
+			if (plen < 0)
+				/* ... followed by '\No newline'; nothing */
+				break;
+			*old++ = '\n';
+			strbuf_addch(&newlines, '\n');
+			add_line_info(&preimage, "\n", 1, LINE_COMMON);
+			add_line_info(&postimage, "\n", 1, LINE_COMMON);
+			is_blank_context = 1;
+			break;
+		case ' ':
+			if (plen && (ws_rule & WS_BLANK_AT_EOF) &&
+			    ws_blank_line(patch + 1, plen, ws_rule))
+				is_blank_context = 1;
+		case '-':
+			memcpy(old, patch + 1, plen);
+			add_line_info(&preimage, old, plen,
+				      (first == ' ' ? LINE_COMMON : 0));
+			old += plen;
+			if (first == '-')
+				break;
+		/* Fall-through for ' ' */
+		case '+':
+			/* --no-add does not add new lines */
+			if (first == '+' && state->no_add)
+				break;
+
+			start = newlines.len;
+			if (first != '+' ||
+			    !state->whitespace_error ||
+			    state->ws_error_action != correct_ws_error) {
+				strbuf_add(&newlines, patch + 1, plen);
+			}
+			else {
+				ws_fix_copy(&newlines, patch + 1, plen, ws_rule, &state->applied_after_fixing_ws);
+			}
+			add_line_info(&postimage, newlines.buf + start, newlines.len - start,
+				      (first == '+' ? 0 : LINE_COMMON));
+			if (first == '+' &&
+			    (ws_rule & WS_BLANK_AT_EOF) &&
+			    ws_blank_line(patch + 1, plen, ws_rule))
+				added_blank_line = 1;
+			break;
+		case '@': case '\\':
+			/* Ignore it, we already handled it */
+			break;
+		default:
+			if (state->apply_verbosity > verbosity_normal)
+				error(_("invalid start of line: '%c'"), first);
+			applied_pos = -1;
+			goto out;
+		}
+		if (added_blank_line) {
+			if (!new_blank_lines_at_end)
+				found_new_blank_lines_at_end = hunk_linenr;
+			new_blank_lines_at_end++;
+		}
+		else if (is_blank_context)
+			;
+		else
+			new_blank_lines_at_end = 0;
+		patch += len;
+		size -= len;
+		hunk_linenr++;
+	}
+	if (inaccurate_eof &&
+	    old > oldlines && old[-1] == '\n' &&
+	    newlines.len > 0 && newlines.buf[newlines.len - 1] == '\n') {
+		old--;
+		strbuf_setlen(&newlines, newlines.len - 1);
+	}
+
+	leading = frag->leading;
+	trailing = frag->trailing;
+
+	/*
+	 * A hunk to change lines at the beginning would begin with
+	 * @@ -1,L +N,M @@
+	 * but we need to be careful.  -U0 that inserts before the second
+	 * line also has this pattern.
+	 *
+	 * And a hunk to add to an empty file would begin with
+	 * @@ -0,0 +N,M @@
+	 *
+	 * In other words, a hunk that is (frag->oldpos <= 1) with or
+	 * without leading context must match at the beginning.
+	 */
+	match_beginning = (!frag->oldpos ||
+			   (frag->oldpos == 1 && !state->unidiff_zero));
+
+	/*
+	 * A hunk without trailing lines must match at the end.
+	 * However, we simply cannot tell if a hunk must match end
+	 * from the lack of trailing lines if the patch was generated
+	 * with unidiff without any context.
+	 */
+	match_end = !state->unidiff_zero && !trailing;
+
+	pos = frag->newpos ? (frag->newpos - 1) : 0;
+	preimage.buf = oldlines;
+	preimage.len = old - oldlines;
+	postimage.buf = newlines.buf;
+	postimage.len = newlines.len;
+	preimage.line = preimage.line_allocated;
+	postimage.line = postimage.line_allocated;
+
+	for (;;) {
+
+		applied_pos = find_pos(state, img, &preimage, &postimage, pos,
+				       ws_rule, match_beginning, match_end);
+
+		if (applied_pos >= 0)
+			break;
+
+		/* Am I at my context limits? */
+		if ((leading <= state->p_context) && (trailing <= state->p_context))
+			break;
+		if (match_beginning || match_end) {
+			match_beginning = match_end = 0;
+			continue;
+		}
+
+		/*
+		 * Reduce the number of context lines; reduce both
+		 * leading and trailing if they are equal otherwise
+		 * just reduce the larger context.
+		 */
+		if (leading >= trailing) {
+			remove_first_line(&preimage);
+			remove_first_line(&postimage);
+			pos--;
+			leading--;
+		}
+		if (trailing > leading) {
+			remove_last_line(&preimage);
+			remove_last_line(&postimage);
+			trailing--;
+		}
+	}
+
+	if (applied_pos >= 0) {
+		if (new_blank_lines_at_end &&
+		    preimage.nr + applied_pos >= img->nr &&
+		    (ws_rule & WS_BLANK_AT_EOF) &&
+		    state->ws_error_action != nowarn_ws_error) {
+			record_ws_error(state, WS_BLANK_AT_EOF, "+", 1,
+					found_new_blank_lines_at_end);
+			if (state->ws_error_action == correct_ws_error) {
+				while (new_blank_lines_at_end--)
+					remove_last_line(&postimage);
+			}
+			/*
+			 * We would want to prevent write_out_results()
+			 * from taking place in apply_patch() that follows
+			 * the callchain led us here, which is:
+			 * apply_patch->check_patch_list->check_patch->
+			 * apply_data->apply_fragments->apply_one_fragment
+			 */
+			if (state->ws_error_action == die_on_ws_error)
+				state->apply = 0;
+		}
+
+		if (state->apply_verbosity > verbosity_normal && applied_pos != pos) {
+			int offset = applied_pos - pos;
+			if (state->apply_in_reverse)
+				offset = 0 - offset;
+			fprintf_ln(stderr,
+				   Q_("Hunk #%d succeeded at %d (offset %d line).",
+				      "Hunk #%d succeeded at %d (offset %d lines).",
+				      offset),
+				   nth_fragment, applied_pos + 1, offset);
+		}
+
+		/*
+		 * Warn if it was necessary to reduce the number
+		 * of context lines.
+		 */
+		if ((leading != frag->leading ||
+		     trailing != frag->trailing) && state->apply_verbosity > verbosity_silent)
+			fprintf_ln(stderr, _("Context reduced to (%ld/%ld)"
+					     " to apply fragment at %d"),
+				   leading, trailing, applied_pos+1);
+		update_image(state, img, applied_pos, &preimage, &postimage);
+	} else {
+		if (state->apply_verbosity > verbosity_normal)
+			error(_("while searching for:\n%.*s"),
+			      (int)(old - oldlines), oldlines);
+	}
+
+out:
+	free(oldlines);
+	strbuf_release(&newlines);
+	free(preimage.line_allocated);
+	free(postimage.line_allocated);
+
+	return (applied_pos < 0);
+}
+
+static int apply_binary_fragment(struct apply_state *state,
+				 struct image *img,
+				 struct patch *patch)
+{
+	struct fragment *fragment = patch->fragments;
+	unsigned long len;
+	void *dst;
+
+	if (!fragment)
+		return error(_("missing binary patch data for '%s'"),
+			     patch->new_name ?
+			     patch->new_name :
+			     patch->old_name);
+
+	/* Binary patch is irreversible without the optional second hunk */
+	if (state->apply_in_reverse) {
+		if (!fragment->next)
+			return error("cannot reverse-apply a binary patch "
+				     "without the reverse hunk to '%s'",
+				     patch->new_name
+				     ? patch->new_name : patch->old_name);
+		fragment = fragment->next;
+	}
+	switch (fragment->binary_patch_method) {
+	case BINARY_DELTA_DEFLATED:
+		dst = patch_delta(img->buf, img->len, fragment->patch,
+				  fragment->size, &len);
+		if (!dst)
+			return -1;
+		clear_image(img);
+		img->buf = dst;
+		img->len = len;
+		return 0;
+	case BINARY_LITERAL_DEFLATED:
+		clear_image(img);
+		img->len = fragment->size;
+		img->buf = xmemdupz(fragment->patch, img->len);
+		return 0;
+	}
+	return -1;
+}
+
+/*
+ * Replace "img" with the result of applying the binary patch.
+ * The binary patch data itself in patch->fragment is still kept
+ * but the preimage prepared by the caller in "img" is freed here
+ * or in the helper function apply_binary_fragment() this calls.
+ */
+static int apply_binary(struct apply_state *state,
+			struct image *img,
+			struct patch *patch)
+{
+	const char *name = patch->old_name ? patch->old_name : patch->new_name;
+	unsigned char sha1[20];
+
+	/*
+	 * For safety, we require patch index line to contain
+	 * full 40-byte textual SHA1 for old and new, at least for now.
+	 */
+	if (strlen(patch->old_sha1_prefix) != 40 ||
+	    strlen(patch->new_sha1_prefix) != 40 ||
+	    get_sha1_hex(patch->old_sha1_prefix, sha1) ||
+	    get_sha1_hex(patch->new_sha1_prefix, sha1))
+		return error("cannot apply binary patch to '%s' "
+			     "without full index line", name);
+
+	if (patch->old_name) {
+		/*
+		 * See if the old one matches what the patch
+		 * applies to.
+		 */
+		hash_sha1_file(img->buf, img->len, blob_type, sha1);
+		if (strcmp(sha1_to_hex(sha1), patch->old_sha1_prefix))
+			return error("the patch applies to '%s' (%s), "
+				     "which does not match the "
+				     "current contents.",
+				     name, sha1_to_hex(sha1));
+	}
+	else {
+		/* Otherwise, the old one must be empty. */
+		if (img->len)
+			return error("the patch applies to an empty "
+				     "'%s' but it is not empty", name);
+	}
+
+	get_sha1_hex(patch->new_sha1_prefix, sha1);
+	if (is_null_sha1(sha1)) {
+		clear_image(img);
+		return 0; /* deletion patch */
+	}
+
+	if (has_sha1_file(sha1)) {
+		/* We already have the postimage */
+		enum object_type type;
+		unsigned long size;
+		char *result;
+
+		result = read_sha1_file(sha1, &type, &size);
+		if (!result)
+			return error("the necessary postimage %s for "
+				     "'%s' cannot be read",
+				     patch->new_sha1_prefix, name);
+		clear_image(img);
+		img->buf = result;
+		img->len = size;
+	} else {
+		/*
+		 * We have verified buf matches the preimage;
+		 * apply the patch data to it, which is stored
+		 * in the patch->fragments->{patch,size}.
+		 */
+		if (apply_binary_fragment(state, img, patch))
+			return error(_("binary patch does not apply to '%s'"),
+				     name);
+
+		/* verify that the result matches */
+		hash_sha1_file(img->buf, img->len, blob_type, sha1);
+		if (strcmp(sha1_to_hex(sha1), patch->new_sha1_prefix))
+			return error(_("binary patch to '%s' creates incorrect result (expecting %s, got %s)"),
+				name, patch->new_sha1_prefix, sha1_to_hex(sha1));
+	}
+
+	return 0;
+}
+
+static int apply_fragments(struct apply_state *state, struct image *img, struct patch *patch)
+{
+	struct fragment *frag = patch->fragments;
+	const char *name = patch->old_name ? patch->old_name : patch->new_name;
+	unsigned ws_rule = patch->ws_rule;
+	unsigned inaccurate_eof = patch->inaccurate_eof;
+	int nth = 0;
+
+	if (patch->is_binary)
+		return apply_binary(state, img, patch);
+
+	while (frag) {
+		nth++;
+		if (apply_one_fragment(state, img, frag, inaccurate_eof, ws_rule, nth)) {
+			error(_("patch failed: %s:%ld"), name, frag->oldpos);
+			if (!state->apply_with_reject)
+				return -1;
+			frag->rejected = 1;
+		}
+		frag = frag->next;
+	}
+	return 0;
+}
+
+static int read_blob_object(struct strbuf *buf, const unsigned char *sha1, unsigned mode)
+{
+	if (S_ISGITLINK(mode)) {
+		strbuf_grow(buf, 100);
+		strbuf_addf(buf, "Subproject commit %s\n", sha1_to_hex(sha1));
+	} else {
+		enum object_type type;
+		unsigned long sz;
+		char *result;
+
+		result = read_sha1_file(sha1, &type, &sz);
+		if (!result)
+			return -1;
+		/* XXX read_sha1_file NUL-terminates */
+		strbuf_attach(buf, result, sz, sz + 1);
+	}
+	return 0;
+}
+
+static int read_file_or_gitlink(const struct cache_entry *ce, struct strbuf *buf)
+{
+	if (!ce)
+		return 0;
+	return read_blob_object(buf, ce->sha1, ce->ce_mode);
+}
+
+static struct patch *in_fn_table(struct apply_state *state, const char *name)
+{
+	struct string_list_item *item;
+
+	if (name == NULL)
+		return NULL;
+
+	item = string_list_lookup(&state->fn_table, name);
+	if (item != NULL)
+		return (struct patch *)item->util;
+
+	return NULL;
+}
+
+/*
+ * item->util in the filename table records the status of the path.
+ * Usually it points at a patch (whose result records the contents
+ * of it after applying it), but it could be PATH_WAS_DELETED for a
+ * path that a previously applied patch has already removed, or
+ * PATH_TO_BE_DELETED for a path that a later patch would remove.
+ *
+ * The latter is needed to deal with a case where two paths A and B
+ * are swapped by first renaming A to B and then renaming B to A;
+ * moving A to B should not be prevented due to presence of B as we
+ * will remove it in a later patch.
+ */
+#define PATH_TO_BE_DELETED ((struct patch *) -2)
+#define PATH_WAS_DELETED ((struct patch *) -1)
+
+static int to_be_deleted(struct patch *patch)
+{
+	return patch == PATH_TO_BE_DELETED;
+}
+
+static int was_deleted(struct patch *patch)
+{
+	return patch == PATH_WAS_DELETED;
+}
+
+static void add_to_fn_table(struct apply_state *state, struct patch *patch)
+{
+	struct string_list_item *item;
+
+	/*
+	 * Always add new_name unless patch is a deletion
+	 * This should cover the cases for normal diffs,
+	 * file creations and copies
+	 */
+	if (patch->new_name != NULL) {
+		item = string_list_insert(&state->fn_table, patch->new_name);
+		item->util = patch;
+	}
+
+	/*
+	 * store a failure on rename/deletion cases because
+	 * later chunks shouldn't patch old names
+	 */
+	if ((patch->new_name == NULL) || (patch->is_rename)) {
+		item = string_list_insert(&state->fn_table, patch->old_name);
+		item->util = PATH_WAS_DELETED;
+	}
+}
+
+static void prepare_fn_table(struct apply_state *state, struct patch *patch)
+{
+	/*
+	 * store information about incoming file deletion
+	 */
+	while (patch) {
+		if ((patch->new_name == NULL) || (patch->is_rename)) {
+			struct string_list_item *item;
+			item = string_list_insert(&state->fn_table, patch->old_name);
+			item->util = PATH_TO_BE_DELETED;
+		}
+		patch = patch->next;
+	}
+}
+
+static int checkout_target(struct index_state *istate,
+			   struct cache_entry *ce, struct stat *st)
+{
+	struct checkout costate;
+
+	memset(&costate, 0, sizeof(costate));
+	costate.base_dir = "";
+	costate.refresh_cache = 1;
+	costate.istate = istate;
+	if (checkout_entry(ce, &costate, NULL) || lstat(ce->name, st))
+		return error(_("cannot checkout %s"), ce->name);
+	return 0;
+}
+
+static struct patch *previous_patch(struct apply_state *state,
+				    struct patch *patch,
+				    int *gone)
+{
+	struct patch *previous;
+
+	*gone = 0;
+	if (patch->is_copy || patch->is_rename)
+		return NULL; /* "git" patches do not depend on the order */
+
+	previous = in_fn_table(state, patch->old_name);
+	if (!previous)
+		return NULL;
+
+	if (to_be_deleted(previous))
+		return NULL; /* the deletion hasn't happened yet */
+
+	if (was_deleted(previous))
+		*gone = 1;
+
+	return previous;
+}
+
+static int verify_index_match(const struct cache_entry *ce, struct stat *st)
+{
+	if (S_ISGITLINK(ce->ce_mode)) {
+		if (!S_ISDIR(st->st_mode))
+			return -1;
+		return 0;
+	}
+	return ce_match_stat(ce, st, CE_MATCH_IGNORE_VALID|CE_MATCH_IGNORE_SKIP_WORKTREE);
+}
+
+#define SUBMODULE_PATCH_WITHOUT_INDEX 1
+
+static int load_patch_target(struct apply_state *state,
+			     struct strbuf *buf,
+			     const struct cache_entry *ce,
+			     struct stat *st,
+			     const char *name,
+			     unsigned expected_mode)
+{
+	if (state->cached || state->check_index) {
+		if (read_file_or_gitlink(ce, buf))
+			return error(_("failed to read %s"), name);
+	} else if (name) {
+		if (S_ISGITLINK(expected_mode)) {
+			if (ce)
+				return read_file_or_gitlink(ce, buf);
+			else
+				return SUBMODULE_PATCH_WITHOUT_INDEX;
+		} else if (has_symlink_leading_path(name, strlen(name))) {
+			return error(_("reading from '%s' beyond a symbolic link"), name);
+		} else {
+			if (read_old_data(st, name, buf))
+				return error(_("failed to read %s"), name);
+		}
+	}
+	return 0;
+}
+
+/*
+ * We are about to apply "patch"; populate the "image" with the
+ * current version we have, from the working tree or from the index,
+ * depending on the situation e.g. --cached/--index.  If we are
+ * applying a non-git patch that incrementally updates the tree,
+ * we read from the result of a previous diff.
+ */
+static int load_preimage(struct apply_state *state,
+			 struct image *image,
+			 struct patch *patch, struct stat *st,
+			 const struct cache_entry *ce)
+{
+	struct strbuf buf = STRBUF_INIT;
+	size_t len;
+	char *img;
+	struct patch *previous;
+	int status;
+
+	previous = previous_patch(state, patch, &status);
+	if (status)
+		return error(_("path %s has been renamed/deleted"),
+			     patch->old_name);
+	if (previous) {
+		/* We have a patched copy in memory; use that. */
+		strbuf_add(&buf, previous->result, previous->resultsize);
+	} else {
+		status = load_patch_target(state, &buf, ce, st,
+					   patch->old_name, patch->old_mode);
+		if (status < 0)
+			return status;
+		else if (status == SUBMODULE_PATCH_WITHOUT_INDEX) {
+			/*
+			 * There is no way to apply subproject
+			 * patch without looking at the index.
+			 * NEEDSWORK: shouldn't this be flagged
+			 * as an error???
+			 */
+			free_fragment_list(patch->fragments);
+			patch->fragments = NULL;
+		} else if (status) {
+			return error(_("failed to read %s"), patch->old_name);
+		}
+	}
+
+	img = strbuf_detach(&buf, &len);
+	prepare_image(image, img, len, !patch->is_binary);
+	return 0;
+}
+
+static int three_way_merge(struct image *image,
+			   char *path,
+			   const unsigned char *base,
+			   const unsigned char *ours,
+			   const unsigned char *theirs)
+{
+	mmfile_t base_file, our_file, their_file;
+	mmbuffer_t result = { NULL };
+	int status;
+
+	read_mmblob(&base_file, base);
+	read_mmblob(&our_file, ours);
+	read_mmblob(&their_file, theirs);
+	status = ll_merge(&result, path,
+			  &base_file, "base",
+			  &our_file, "ours",
+			  &their_file, "theirs", NULL);
+	free(base_file.ptr);
+	free(our_file.ptr);
+	free(their_file.ptr);
+	if (status < 0 || !result.ptr) {
+		free(result.ptr);
+		return -1;
+	}
+	clear_image(image);
+	image->buf = result.ptr;
+	image->len = result.size;
+
+	return status;
+}
+
+/*
+ * When directly falling back to add/add three-way merge, we read from
+ * the current contents of the new_name.  In no cases other than that
+ * this function will be called.
+ */
+static int load_current(struct apply_state *state,
+			struct image *image,
+			struct patch *patch)
+{
+	struct strbuf buf = STRBUF_INIT;
+	int status, pos;
+	size_t len;
+	char *img;
+	struct stat st;
+	struct cache_entry *ce;
+	char *name = patch->new_name;
+	unsigned mode = patch->new_mode;
+
+	if (!patch->is_new)
+		die("BUG: patch to %s is not a creation", patch->old_name);
+
+	pos = cache_name_pos(name, strlen(name));
+	if (pos < 0)
+		return error(_("%s: does not exist in index"), name);
+	ce = active_cache[pos];
+	if (lstat(name, &st)) {
+		if (errno != ENOENT)
+			return error_errno("%s", name);
+		if (checkout_target(&the_index, ce, &st))
+			return -1;
+	}
+	if (verify_index_match(ce, &st))
+		return error(_("%s: does not match index"), name);
+
+	status = load_patch_target(state, &buf, ce, &st, name, mode);
+	if (status < 0)
+		return status;
+	else if (status)
+		return -1;
+	img = strbuf_detach(&buf, &len);
+	prepare_image(image, img, len, !patch->is_binary);
+	return 0;
+}
+
+static int try_threeway(struct apply_state *state,
+			struct image *image,
+			struct patch *patch,
+			struct stat *st,
+			const struct cache_entry *ce)
+{
+	unsigned char pre_sha1[20], post_sha1[20], our_sha1[20];
+	struct strbuf buf = STRBUF_INIT;
+	size_t len;
+	int status;
+	char *img;
+	struct image tmp_image;
+
+	/* No point falling back to 3-way merge in these cases */
+	if (patch->is_delete ||
+	    S_ISGITLINK(patch->old_mode) || S_ISGITLINK(patch->new_mode))
+		return -1;
+
+	/* Preimage the patch was prepared for */
+	if (patch->is_new)
+		write_sha1_file("", 0, blob_type, pre_sha1);
+	else if (get_sha1(patch->old_sha1_prefix, pre_sha1) ||
+		 read_blob_object(&buf, pre_sha1, patch->old_mode))
+		return error("repository lacks the necessary blob to fall back on 3-way merge.");
+
+	if (state->apply_verbosity > verbosity_silent)
+		fprintf(stderr, "Falling back to three-way merge...\n");
+
+	img = strbuf_detach(&buf, &len);
+	prepare_image(&tmp_image, img, len, 1);
+	/* Apply the patch to get the post image */
+	if (apply_fragments(state, &tmp_image, patch) < 0) {
+		clear_image(&tmp_image);
+		return -1;
+	}
+	/* post_sha1[] is theirs */
+	write_sha1_file(tmp_image.buf, tmp_image.len, blob_type, post_sha1);
+	clear_image(&tmp_image);
+
+	/* our_sha1[] is ours */
+	if (patch->is_new) {
+		if (load_current(state, &tmp_image, patch))
+			return error("cannot read the current contents of '%s'",
+				     patch->new_name);
+	} else {
+		if (load_preimage(state, &tmp_image, patch, st, ce))
+			return error("cannot read the current contents of '%s'",
+				     patch->old_name);
+	}
+	write_sha1_file(tmp_image.buf, tmp_image.len, blob_type, our_sha1);
+	clear_image(&tmp_image);
+
+	/* in-core three-way merge between post and our using pre as base */
+	status = three_way_merge(image, patch->new_name,
+				 pre_sha1, our_sha1, post_sha1);
+	if (status < 0) {
+		if (state->apply_verbosity > verbosity_silent)
+			fprintf(stderr,
+				"Failed to fall back on three-way merge...\n");
+		return status;
+	}
+
+	if (status) {
+		patch->conflicted_threeway = 1;
+		if (patch->is_new)
+			oidclr(&patch->threeway_stage[0]);
+		else
+			hashcpy(patch->threeway_stage[0].hash, pre_sha1);
+		hashcpy(patch->threeway_stage[1].hash, our_sha1);
+		hashcpy(patch->threeway_stage[2].hash, post_sha1);
+		if (state->apply_verbosity > verbosity_silent)
+			fprintf(stderr,
+				"Applied patch to '%s' with conflicts.\n",
+				patch->new_name);
+	} else {
+		if (state->apply_verbosity > verbosity_silent)
+			fprintf(stderr,
+				"Applied patch to '%s' cleanly.\n",
+				patch->new_name);
+	}
+	return 0;
+}
+
+static int apply_data(struct apply_state *state, struct patch *patch,
+		      struct stat *st, const struct cache_entry *ce)
+{
+	struct image image;
+
+	if (load_preimage(state, &image, patch, st, ce) < 0)
+		return -1;
+
+	if (patch->direct_to_threeway ||
+	    apply_fragments(state, &image, patch) < 0) {
+		/* Note: with --reject, apply_fragments() returns 0 */
+		if (!state->threeway || try_threeway(state, &image, patch, st, ce) < 0)
+			return -1;
+	}
+	patch->result = image.buf;
+	patch->resultsize = image.len;
+	add_to_fn_table(state, patch);
+	free(image.line_allocated);
+
+	if (0 < patch->is_delete && patch->resultsize)
+		return error(_("removal patch leaves file contents"));
+
+	return 0;
+}
+
+/*
+ * If "patch" that we are looking at modifies or deletes what we have,
+ * we would want it not to lose any local modification we have, either
+ * in the working tree or in the index.
+ *
+ * This also decides if a non-git patch is a creation patch or a
+ * modification to an existing empty file.  We do not check the state
+ * of the current tree for a creation patch in this function; the caller
+ * check_patch() separately makes sure (and errors out otherwise) that
+ * the path the patch creates does not exist in the current tree.
+ */
+static int check_preimage(struct apply_state *state,
+			  struct patch *patch,
+			  struct cache_entry **ce,
+			  struct stat *st)
+{
+	const char *old_name = patch->old_name;
+	struct patch *previous = NULL;
+	int stat_ret = 0, status;
+	unsigned st_mode = 0;
+
+	if (!old_name)
+		return 0;
+
+	assert(patch->is_new <= 0);
+	previous = previous_patch(state, patch, &status);
+
+	if (status)
+		return error(_("path %s has been renamed/deleted"), old_name);
+	if (previous) {
+		st_mode = previous->new_mode;
+	} else if (!state->cached) {
+		stat_ret = lstat(old_name, st);
+		if (stat_ret && errno != ENOENT)
+			return error_errno("%s", old_name);
+	}
+
+	if (state->check_index && !previous) {
+		int pos = cache_name_pos(old_name, strlen(old_name));
+		if (pos < 0) {
+			if (patch->is_new < 0)
+				goto is_new;
+			return error(_("%s: does not exist in index"), old_name);
+		}
+		*ce = active_cache[pos];
+		if (stat_ret < 0) {
+			if (checkout_target(&the_index, *ce, st))
+				return -1;
+		}
+		if (!state->cached && verify_index_match(*ce, st))
+			return error(_("%s: does not match index"), old_name);
+		if (state->cached)
+			st_mode = (*ce)->ce_mode;
+	} else if (stat_ret < 0) {
+		if (patch->is_new < 0)
+			goto is_new;
+		return error_errno("%s", old_name);
+	}
+
+	if (!state->cached && !previous)
+		st_mode = ce_mode_from_stat(*ce, st->st_mode);
+
+	if (patch->is_new < 0)
+		patch->is_new = 0;
+	if (!patch->old_mode)
+		patch->old_mode = st_mode;
+	if ((st_mode ^ patch->old_mode) & S_IFMT)
+		return error(_("%s: wrong type"), old_name);
+	if (st_mode != patch->old_mode)
+		warning(_("%s has type %o, expected %o"),
+			old_name, st_mode, patch->old_mode);
+	if (!patch->new_mode && !patch->is_delete)
+		patch->new_mode = st_mode;
+	return 0;
+
+ is_new:
+	patch->is_new = 1;
+	patch->is_delete = 0;
+	free(patch->old_name);
+	patch->old_name = NULL;
+	return 0;
+}
+
+
+#define EXISTS_IN_INDEX 1
+#define EXISTS_IN_WORKTREE 2
+
+static int check_to_create(struct apply_state *state,
+			   const char *new_name,
+			   int ok_if_exists)
+{
+	struct stat nst;
+
+	if (state->check_index &&
+	    cache_name_pos(new_name, strlen(new_name)) >= 0 &&
+	    !ok_if_exists)
+		return EXISTS_IN_INDEX;
+	if (state->cached)
+		return 0;
+
+	if (!lstat(new_name, &nst)) {
+		if (S_ISDIR(nst.st_mode) || ok_if_exists)
+			return 0;
+		/*
+		 * A leading component of new_name might be a symlink
+		 * that is going to be removed with this patch, but
+		 * still pointing at somewhere that has the path.
+		 * In such a case, path "new_name" does not exist as
+		 * far as git is concerned.
+		 */
+		if (has_symlink_leading_path(new_name, strlen(new_name)))
+			return 0;
+
+		return EXISTS_IN_WORKTREE;
+	} else if ((errno != ENOENT) && (errno != ENOTDIR)) {
+		return error_errno("%s", new_name);
+	}
+	return 0;
+}
+
+static uintptr_t register_symlink_changes(struct apply_state *state,
+					  const char *path,
+					  uintptr_t what)
+{
+	struct string_list_item *ent;
+
+	ent = string_list_lookup(&state->symlink_changes, path);
+	if (!ent) {
+		ent = string_list_insert(&state->symlink_changes, path);
+		ent->util = (void *)0;
+	}
+	ent->util = (void *)(what | ((uintptr_t)ent->util));
+	return (uintptr_t)ent->util;
+}
+
+static uintptr_t check_symlink_changes(struct apply_state *state, const char *path)
+{
+	struct string_list_item *ent;
+
+	ent = string_list_lookup(&state->symlink_changes, path);
+	if (!ent)
+		return 0;
+	return (uintptr_t)ent->util;
+}
+
+static void prepare_symlink_changes(struct apply_state *state, struct patch *patch)
+{
+	for ( ; patch; patch = patch->next) {
+		if ((patch->old_name && S_ISLNK(patch->old_mode)) &&
+		    (patch->is_rename || patch->is_delete))
+			/* the symlink at patch->old_name is removed */
+			register_symlink_changes(state, patch->old_name, APPLY_SYMLINK_GOES_AWAY);
+
+		if (patch->new_name && S_ISLNK(patch->new_mode))
+			/* the symlink at patch->new_name is created or remains */
+			register_symlink_changes(state, patch->new_name, APPLY_SYMLINK_IN_RESULT);
+	}
+}
+
+static int path_is_beyond_symlink_1(struct apply_state *state, struct strbuf *name)
+{
+	do {
+		unsigned int change;
+
+		while (--name->len && name->buf[name->len] != '/')
+			; /* scan backwards */
+		if (!name->len)
+			break;
+		name->buf[name->len] = '\0';
+		change = check_symlink_changes(state, name->buf);
+		if (change & APPLY_SYMLINK_IN_RESULT)
+			return 1;
+		if (change & APPLY_SYMLINK_GOES_AWAY)
+			/*
+			 * This cannot be "return 0", because we may
+			 * see a new one created at a higher level.
+			 */
+			continue;
+
+		/* otherwise, check the preimage */
+		if (state->check_index) {
+			struct cache_entry *ce;
+
+			ce = cache_file_exists(name->buf, name->len, ignore_case);
+			if (ce && S_ISLNK(ce->ce_mode))
+				return 1;
+		} else {
+			struct stat st;
+			if (!lstat(name->buf, &st) && S_ISLNK(st.st_mode))
+				return 1;
+		}
+	} while (1);
+	return 0;
+}
+
+static int path_is_beyond_symlink(struct apply_state *state, const char *name_)
+{
+	int ret;
+	struct strbuf name = STRBUF_INIT;
+
+	assert(*name_ != '\0');
+	strbuf_addstr(&name, name_);
+	ret = path_is_beyond_symlink_1(state, &name);
+	strbuf_release(&name);
+
+	return ret;
+}
+
+static int check_unsafe_path(struct patch *patch)
+{
+	const char *old_name = NULL;
+	const char *new_name = NULL;
+	if (patch->is_delete)
+		old_name = patch->old_name;
+	else if (!patch->is_new && !patch->is_copy)
+		old_name = patch->old_name;
+	if (!patch->is_delete)
+		new_name = patch->new_name;
+
+	if (old_name && !verify_path(old_name))
+		return error(_("invalid path '%s'"), old_name);
+	if (new_name && !verify_path(new_name))
+		return error(_("invalid path '%s'"), new_name);
+	return 0;
+}
+
+/*
+ * Check and apply the patch in-core; leave the result in patch->result
+ * for the caller to write it out to the final destination.
+ */
+static int check_patch(struct apply_state *state, struct patch *patch)
+{
+	struct stat st;
+	const char *old_name = patch->old_name;
+	const char *new_name = patch->new_name;
+	const char *name = old_name ? old_name : new_name;
+	struct cache_entry *ce = NULL;
+	struct patch *tpatch;
+	int ok_if_exists;
+	int status;
+
+	patch->rejected = 1; /* we will drop this after we succeed */
+
+	status = check_preimage(state, patch, &ce, &st);
+	if (status)
+		return status;
+	old_name = patch->old_name;
+
+	/*
+	 * A type-change diff is always split into a patch to delete
+	 * old, immediately followed by a patch to create new (see
+	 * diff.c::run_diff()); in such a case it is Ok that the entry
+	 * to be deleted by the previous patch is still in the working
+	 * tree and in the index.
+	 *
+	 * A patch to swap-rename between A and B would first rename A
+	 * to B and then rename B to A.  While applying the first one,
+	 * the presence of B should not stop A from getting renamed to
+	 * B; ask to_be_deleted() about the later rename.  Removal of
+	 * B and rename from A to B is handled the same way by asking
+	 * was_deleted().
+	 */
+	if ((tpatch = in_fn_table(state, new_name)) &&
+	    (was_deleted(tpatch) || to_be_deleted(tpatch)))
+		ok_if_exists = 1;
+	else
+		ok_if_exists = 0;
+
+	if (new_name &&
+	    ((0 < patch->is_new) || patch->is_rename || patch->is_copy)) {
+		int err = check_to_create(state, new_name, ok_if_exists);
+
+		if (err && state->threeway) {
+			patch->direct_to_threeway = 1;
+		} else switch (err) {
+		case 0:
+			break; /* happy */
+		case EXISTS_IN_INDEX:
+			return error(_("%s: already exists in index"), new_name);
+			break;
+		case EXISTS_IN_WORKTREE:
+			return error(_("%s: already exists in working directory"),
+				     new_name);
+		default:
+			return err;
+		}
+
+		if (!patch->new_mode) {
+			if (0 < patch->is_new)
+				patch->new_mode = S_IFREG | 0644;
+			else
+				patch->new_mode = patch->old_mode;
+		}
+	}
+
+	if (new_name && old_name) {
+		int same = !strcmp(old_name, new_name);
+		if (!patch->new_mode)
+			patch->new_mode = patch->old_mode;
+		if ((patch->old_mode ^ patch->new_mode) & S_IFMT) {
+			if (same)
+				return error(_("new mode (%o) of %s does not "
+					       "match old mode (%o)"),
+					patch->new_mode, new_name,
+					patch->old_mode);
+			else
+				return error(_("new mode (%o) of %s does not "
+					       "match old mode (%o) of %s"),
+					patch->new_mode, new_name,
+					patch->old_mode, old_name);
+		}
+	}
+
+	if (!state->unsafe_paths && check_unsafe_path(patch))
+		return -128;
+
+	/*
+	 * An attempt to read from or delete a path that is beyond a
+	 * symbolic link will be prevented by load_patch_target() that
+	 * is called at the beginning of apply_data() so we do not
+	 * have to worry about a patch marked with "is_delete" bit
+	 * here.  We however need to make sure that the patch result
+	 * is not deposited to a path that is beyond a symbolic link
+	 * here.
+	 */
+	if (!patch->is_delete && path_is_beyond_symlink(state, patch->new_name))
+		return error(_("affected file '%s' is beyond a symbolic link"),
+			     patch->new_name);
+
+	if (apply_data(state, patch, &st, ce) < 0)
+		return error(_("%s: patch does not apply"), name);
+	patch->rejected = 0;
+	return 0;
+}
+
+static int check_patch_list(struct apply_state *state, struct patch *patch)
+{
+	int err = 0;
+
+	prepare_symlink_changes(state, patch);
+	prepare_fn_table(state, patch);
+	while (patch) {
+		int res;
+		if (state->apply_verbosity > verbosity_normal)
+			say_patch_name(stderr,
+				       _("Checking patch %s..."), patch);
+		res = check_patch(state, patch);
+		if (res == -128)
+			return -128;
+		err |= res;
+		patch = patch->next;
+	}
+	return err;
+}
+
+static int read_apply_cache(struct apply_state *state)
+{
+	if (state->index_file)
+		return read_cache_from(state->index_file);
+	else
+		return read_cache();
+}
+
+/* This function tries to read the sha1 from the current index */
+static int get_current_sha1(struct apply_state *state, const char *path,
+			    unsigned char *sha1)
+{
+	int pos;
+
+	if (read_apply_cache(state) < 0)
+		return -1;
+	pos = cache_name_pos(path, strlen(path));
+	if (pos < 0)
+		return -1;
+	hashcpy(sha1, active_cache[pos]->sha1);
+	return 0;
+}
+
+static int preimage_sha1_in_gitlink_patch(struct patch *p, unsigned char sha1[20])
+{
+	/*
+	 * A usable gitlink patch has only one fragment (hunk) that looks like:
+	 * @@ -1 +1 @@
+	 * -Subproject commit <old sha1>
+	 * +Subproject commit <new sha1>
+	 * or
+	 * @@ -1 +0,0 @@
+	 * -Subproject commit <old sha1>
+	 * for a removal patch.
+	 */
+	struct fragment *hunk = p->fragments;
+	static const char heading[] = "-Subproject commit ";
+	char *preimage;
+
+	if (/* does the patch have only one hunk? */
+	    hunk && !hunk->next &&
+	    /* is its preimage one line? */
+	    hunk->oldpos == 1 && hunk->oldlines == 1 &&
+	    /* does preimage begin with the heading? */
+	    (preimage = memchr(hunk->patch, '\n', hunk->size)) != NULL &&
+	    starts_with(++preimage, heading) &&
+	    /* does it record full SHA-1? */
+	    !get_sha1_hex(preimage + sizeof(heading) - 1, sha1) &&
+	    preimage[sizeof(heading) + 40 - 1] == '\n' &&
+	    /* does the abbreviated name on the index line agree with it? */
+	    starts_with(preimage + sizeof(heading) - 1, p->old_sha1_prefix))
+		return 0; /* it all looks fine */
+
+	/* we may have full object name on the index line */
+	return get_sha1_hex(p->old_sha1_prefix, sha1);
+}
+
+/* Build an index that contains the just the files needed for a 3way merge */
+static int build_fake_ancestor(struct apply_state *state, struct patch *list)
+{
+	struct patch *patch;
+	struct index_state result = { NULL };
+	static struct lock_file lock;
+	int res;
+
+	/* Once we start supporting the reverse patch, it may be
+	 * worth showing the new sha1 prefix, but until then...
+	 */
+	for (patch = list; patch; patch = patch->next) {
+		unsigned char sha1[20];
+		struct cache_entry *ce;
+		const char *name;
+
+		name = patch->old_name ? patch->old_name : patch->new_name;
+		if (0 < patch->is_new)
+			continue;
+
+		if (S_ISGITLINK(patch->old_mode)) {
+			if (!preimage_sha1_in_gitlink_patch(patch, sha1))
+				; /* ok, the textual part looks sane */
+			else
+				return error("sha1 information is lacking or "
+					     "useless for submodule %s", name);
+		} else if (!get_sha1_blob(patch->old_sha1_prefix, sha1)) {
+			; /* ok */
+		} else if (!patch->lines_added && !patch->lines_deleted) {
+			/* mode-only change: update the current */
+			if (get_current_sha1(state, patch->old_name, sha1))
+				return error("mode change for %s, which is not "
+					     "in current HEAD", name);
+		} else
+			return error("sha1 information is lacking or useless "
+				     "(%s).", name);
+
+		ce = make_cache_entry(patch->old_mode, sha1, name, 0, 0);
+		if (!ce)
+			return error(_("make_cache_entry failed for path '%s'"),
+				     name);
+		if (add_index_entry(&result, ce, ADD_CACHE_OK_TO_ADD)) {
+			free(ce);
+			return error("Could not add %s to temporary index",
+				     name);
+		}
+	}
+
+	hold_lock_file_for_update(&lock, state->fake_ancestor, LOCK_DIE_ON_ERROR);
+	res = write_locked_index(&result, &lock, COMMIT_LOCK);
+	discard_index(&result);
+
+	if (res)
+		return error("Could not write temporary index to %s",
+			     state->fake_ancestor);
+
+	return 0;
+}
+
+static void stat_patch_list(struct apply_state *state, struct patch *patch)
+{
+	int files, adds, dels;
+
+	for (files = adds = dels = 0 ; patch ; patch = patch->next) {
+		files++;
+		adds += patch->lines_added;
+		dels += patch->lines_deleted;
+		show_stats(state, patch);
+	}
+
+	print_stat_summary(stdout, files, adds, dels);
+}
+
+static void numstat_patch_list(struct apply_state *state,
+			       struct patch *patch)
+{
+	for ( ; patch; patch = patch->next) {
+		const char *name;
+		name = patch->new_name ? patch->new_name : patch->old_name;
+		if (patch->is_binary)
+			printf("-\t-\t");
+		else
+			printf("%d\t%d\t", patch->lines_added, patch->lines_deleted);
+		write_name_quoted(name, stdout, state->line_termination);
+	}
+}
+
+static void show_file_mode_name(const char *newdelete, unsigned int mode, const char *name)
+{
+	if (mode)
+		printf(" %s mode %06o %s\n", newdelete, mode, name);
+	else
+		printf(" %s %s\n", newdelete, name);
+}
+
+static void show_mode_change(struct patch *p, int show_name)
+{
+	if (p->old_mode && p->new_mode && p->old_mode != p->new_mode) {
+		if (show_name)
+			printf(" mode change %06o => %06o %s\n",
+			       p->old_mode, p->new_mode, p->new_name);
+		else
+			printf(" mode change %06o => %06o\n",
+			       p->old_mode, p->new_mode);
+	}
+}
+
+static void show_rename_copy(struct patch *p)
+{
+	const char *renamecopy = p->is_rename ? "rename" : "copy";
+	const char *old, *new;
+
+	/* Find common prefix */
+	old = p->old_name;
+	new = p->new_name;
+	while (1) {
+		const char *slash_old, *slash_new;
+		slash_old = strchr(old, '/');
+		slash_new = strchr(new, '/');
+		if (!slash_old ||
+		    !slash_new ||
+		    slash_old - old != slash_new - new ||
+		    memcmp(old, new, slash_new - new))
+			break;
+		old = slash_old + 1;
+		new = slash_new + 1;
+	}
+	/* p->old_name thru old is the common prefix, and old and new
+	 * through the end of names are renames
+	 */
+	if (old != p->old_name)
+		printf(" %s %.*s{%s => %s} (%d%%)\n", renamecopy,
+		       (int)(old - p->old_name), p->old_name,
+		       old, new, p->score);
+	else
+		printf(" %s %s => %s (%d%%)\n", renamecopy,
+		       p->old_name, p->new_name, p->score);
+	show_mode_change(p, 0);
+}
+
+static void summary_patch_list(struct patch *patch)
+{
+	struct patch *p;
+
+	for (p = patch; p; p = p->next) {
+		if (p->is_new)
+			show_file_mode_name("create", p->new_mode, p->new_name);
+		else if (p->is_delete)
+			show_file_mode_name("delete", p->old_mode, p->old_name);
+		else {
+			if (p->is_rename || p->is_copy)
+				show_rename_copy(p);
+			else {
+				if (p->score) {
+					printf(" rewrite %s (%d%%)\n",
+					       p->new_name, p->score);
+					show_mode_change(p, 0);
+				}
+				else
+					show_mode_change(p, 1);
+			}
+		}
+	}
+}
+
+static void patch_stats(struct apply_state *state, struct patch *patch)
+{
+	int lines = patch->lines_added + patch->lines_deleted;
+
+	if (lines > state->max_change)
+		state->max_change = lines;
+	if (patch->old_name) {
+		int len = quote_c_style(patch->old_name, NULL, NULL, 0);
+		if (!len)
+			len = strlen(patch->old_name);
+		if (len > state->max_len)
+			state->max_len = len;
+	}
+	if (patch->new_name) {
+		int len = quote_c_style(patch->new_name, NULL, NULL, 0);
+		if (!len)
+			len = strlen(patch->new_name);
+		if (len > state->max_len)
+			state->max_len = len;
+	}
+}
+
+static int remove_file(struct apply_state *state, struct patch *patch, int rmdir_empty)
+{
+	if (state->update_index) {
+		if (remove_file_from_cache(patch->old_name) < 0)
+			return error(_("unable to remove %s from index"), patch->old_name);
+	}
+	if (!state->cached) {
+		if (!remove_or_warn(patch->old_mode, patch->old_name) && rmdir_empty) {
+			remove_path(patch->old_name);
+		}
+	}
+	return 0;
+}
+
+static int add_index_file(struct apply_state *state,
+			  const char *path,
+			  unsigned mode,
+			  void *buf,
+			  unsigned long size)
+{
+	struct stat st;
+	struct cache_entry *ce;
+	int namelen = strlen(path);
+	unsigned ce_size = cache_entry_size(namelen);
+
+	if (!state->update_index)
+		return 0;
+
+	ce = xcalloc(1, ce_size);
+	memcpy(ce->name, path, namelen);
+	ce->ce_mode = create_ce_mode(mode);
+	ce->ce_flags = create_ce_flags(0);
+	ce->ce_namelen = namelen;
+	if (S_ISGITLINK(mode)) {
+		const char *s;
+
+		if (!skip_prefix(buf, "Subproject commit ", &s) ||
+		    get_sha1_hex(s, ce->sha1)) {
+			free(ce);
+			return error(_("corrupt patch for submodule %s"), path);
+		}
+	} else {
+		if (!state->cached) {
+			if (lstat(path, &st) < 0) {
+				free(ce);
+				return error_errno(_("unable to stat newly "
+						     "created file '%s'"),
+						   path);
+			}
+			fill_stat_cache_info(ce, &st);
+		}
+		if (write_sha1_file(buf, size, blob_type, ce->sha1) < 0) {
+			free(ce);
+			return error(_("unable to create backing store "
+				       "for newly created file %s"), path);
+		}
+	}
+	if (add_cache_entry(ce, ADD_CACHE_OK_TO_ADD) < 0) {
+		free(ce);
+		return error(_("unable to add cache entry for %s"), path);
+	}
+
+	return 0;
+}
+
+/*
+ * Returns:
+ *  -1 if an unrecoverable error happened
+ *   0 if everything went well
+ *   1 if a recoverable error happened
+ */
+static int try_create_file(const char *path, unsigned int mode, const char *buf, unsigned long size)
+{
+	int fd, res;
+	struct strbuf nbuf = STRBUF_INIT;
+
+	if (S_ISGITLINK(mode)) {
+		struct stat st;
+		if (!lstat(path, &st) && S_ISDIR(st.st_mode))
+			return 0;
+		return !!mkdir(path, 0777);
+	}
+
+	if (has_symlinks && S_ISLNK(mode))
+		/* Although buf:size is counted string, it also is NUL
+		 * terminated.
+		 */
+		return !!symlink(buf, path);
+
+	fd = open(path, O_CREAT | O_EXCL | O_WRONLY, (mode & 0100) ? 0777 : 0666);
+	if (fd < 0)
+		return 1;
+
+	if (convert_to_working_tree(path, buf, size, &nbuf)) {
+		size = nbuf.len;
+		buf  = nbuf.buf;
+	}
+
+	res = write_in_full(fd, buf, size) < 0;
+	if (res)
+		error_errno(_("failed to write to '%s'"), path);
+	strbuf_release(&nbuf);
+
+	if (close(fd) < 0 && !res)
+		return error_errno(_("closing file '%s'"), path);
+
+	return res ? -1 : 0;
+}
+
+/*
+ * We optimistically assume that the directories exist,
+ * which is true 99% of the time anyway. If they don't,
+ * we create them and try again.
+ *
+ * Returns:
+ *   -1 on error
+ *   0 otherwise
+ */
+static int create_one_file(struct apply_state *state,
+			   char *path,
+			   unsigned mode,
+			   const char *buf,
+			   unsigned long size)
+{
+	int res;
+
+	if (state->cached)
+		return 0;
+
+	res = try_create_file(path, mode, buf, size);
+	if (res < 0)
+		return -1;
+	if (!res)
+		return 0;
+
+	if (errno == ENOENT) {
+		if (safe_create_leading_directories(path))
+			return 0;
+		res = try_create_file(path, mode, buf, size);
+		if (res < 0)
+			return -1;
+		if (!res)
+			return 0;
+	}
+
+	if (errno == EEXIST || errno == EACCES) {
+		/* We may be trying to create a file where a directory
+		 * used to be.
+		 */
+		struct stat st;
+		if (!lstat(path, &st) && (!S_ISDIR(st.st_mode) || !rmdir(path)))
+			errno = EEXIST;
+	}
+
+	if (errno == EEXIST) {
+		unsigned int nr = getpid();
+
+		for (;;) {
+			char newpath[PATH_MAX];
+			mksnpath(newpath, sizeof(newpath), "%s~%u", path, nr);
+			res = try_create_file(newpath, mode, buf, size);
+			if (res < 0)
+				return -1;
+			if (!res) {
+				if (!rename(newpath, path))
+					return 0;
+				unlink_or_warn(newpath);
+				break;
+			}
+			if (errno != EEXIST)
+				break;
+			++nr;
+		}
+	}
+	return error_errno(_("unable to write file '%s' mode %o"),
+			   path, mode);
+}
+
+static int add_conflicted_stages_file(struct apply_state *state,
+				       struct patch *patch)
+{
+	int stage, namelen;
+	unsigned ce_size, mode;
+	struct cache_entry *ce;
+
+	if (!state->update_index)
+		return 0;
+	namelen = strlen(patch->new_name);
+	ce_size = cache_entry_size(namelen);
+	mode = patch->new_mode ? patch->new_mode : (S_IFREG | 0644);
+
+	remove_file_from_cache(patch->new_name);
+	for (stage = 1; stage < 4; stage++) {
+		if (is_null_oid(&patch->threeway_stage[stage - 1]))
+			continue;
+		ce = xcalloc(1, ce_size);
+		memcpy(ce->name, patch->new_name, namelen);
+		ce->ce_mode = create_ce_mode(mode);
+		ce->ce_flags = create_ce_flags(stage);
+		ce->ce_namelen = namelen;
+		hashcpy(ce->sha1, patch->threeway_stage[stage - 1].hash);
+		if (add_cache_entry(ce, ADD_CACHE_OK_TO_ADD) < 0) {
+			free(ce);
+			return error(_("unable to add cache entry for %s"),
+				     patch->new_name);
+		}
+	}
+
+	return 0;
+}
+
+static int create_file(struct apply_state *state, struct patch *patch)
+{
+	char *path = patch->new_name;
+	unsigned mode = patch->new_mode;
+	unsigned long size = patch->resultsize;
+	char *buf = patch->result;
+
+	if (!mode)
+		mode = S_IFREG | 0644;
+	if (create_one_file(state, path, mode, buf, size))
+		return -1;
+
+	if (patch->conflicted_threeway)
+		return add_conflicted_stages_file(state, patch);
+	else
+		return add_index_file(state, path, mode, buf, size);
+}
+
+/* phase zero is to remove, phase one is to create */
+static int write_out_one_result(struct apply_state *state,
+				struct patch *patch,
+				int phase)
+{
+	if (patch->is_delete > 0) {
+		if (phase == 0)
+			return remove_file(state, patch, 1);
+		return 0;
+	}
+	if (patch->is_new > 0 || patch->is_copy) {
+		if (phase == 1)
+			return create_file(state, patch);
+		return 0;
+	}
+	/*
+	 * Rename or modification boils down to the same
+	 * thing: remove the old, write the new
+	 */
+	if (phase == 0)
+		return remove_file(state, patch, patch->is_rename);
+	if (phase == 1)
+		return create_file(state, patch);
+	return 0;
+}
+
+static int write_out_one_reject(struct apply_state *state, struct patch *patch)
+{
+	FILE *rej;
+	char namebuf[PATH_MAX];
+	struct fragment *frag;
+	int cnt = 0;
+	struct strbuf sb = STRBUF_INIT;
+
+	for (cnt = 0, frag = patch->fragments; frag; frag = frag->next) {
+		if (!frag->rejected)
+			continue;
+		cnt++;
+	}
+
+	if (!cnt) {
+		if (state->apply_verbosity > verbosity_normal)
+			say_patch_name(stderr,
+				       _("Applied patch %s cleanly."), patch);
+		return 0;
+	}
+
+	/* This should not happen, because a removal patch that leaves
+	 * contents are marked "rejected" at the patch level.
+	 */
+	if (!patch->new_name)
+		die(_("internal error"));
+
+	/* Say this even without --verbose */
+	strbuf_addf(&sb, Q_("Applying patch %%s with %d reject...",
+			    "Applying patch %%s with %d rejects...",
+			    cnt),
+		    cnt);
+	if (state->apply_verbosity > verbosity_silent)
+		say_patch_name(stderr, sb.buf, patch);
+	strbuf_release(&sb);
+
+	cnt = strlen(patch->new_name);
+	if (ARRAY_SIZE(namebuf) <= cnt + 5) {
+		cnt = ARRAY_SIZE(namebuf) - 5;
+		warning(_("truncating .rej filename to %.*s.rej"),
+			cnt - 1, patch->new_name);
+	}
+	memcpy(namebuf, patch->new_name, cnt);
+	memcpy(namebuf + cnt, ".rej", 5);
+
+	rej = fopen(namebuf, "w");
+	if (!rej)
+		return error_errno(_("cannot open %s"), namebuf);
+
+	/* Normal git tools never deal with .rej, so do not pretend
+	 * this is a git patch by saying --git or giving extended
+	 * headers.  While at it, maybe please "kompare" that wants
+	 * the trailing TAB and some garbage at the end of line ;-).
+	 */
+	fprintf(rej, "diff a/%s b/%s\t(rejected hunks)\n",
+		patch->new_name, patch->new_name);
+	for (cnt = 1, frag = patch->fragments;
+	     frag;
+	     cnt++, frag = frag->next) {
+		if (!frag->rejected) {
+			if (state->apply_verbosity > verbosity_silent)
+				fprintf_ln(stderr, _("Hunk #%d applied cleanly."), cnt);
+			continue;
+		}
+		if (state->apply_verbosity > verbosity_silent)
+			fprintf_ln(stderr, _("Rejected hunk #%d."), cnt);
+		fprintf(rej, "%.*s", frag->size, frag->patch);
+		if (frag->patch[frag->size-1] != '\n')
+			fputc('\n', rej);
+	}
+	fclose(rej);
+	return -1;
+}
+
+/*
+ * Returns:
+ *  -1 if an error happened
+ *   0 if the patch applied cleanly
+ *   1 if the patch did not apply cleanly
+ */
+static int write_out_results(struct apply_state *state, struct patch *list)
+{
+	int phase;
+	int errs = 0;
+	struct patch *l;
+	struct string_list cpath = STRING_LIST_INIT_DUP;
+
+	for (phase = 0; phase < 2; phase++) {
+		l = list;
+		while (l) {
+			if (l->rejected)
+				errs = 1;
+			else {
+				if (write_out_one_result(state, l, phase)) {
+					string_list_clear(&cpath, 0);
+					return -1;
+				}
+				if (phase == 1) {
+					if (write_out_one_reject(state, l))
+						errs = 1;
+					if (l->conflicted_threeway) {
+						string_list_append(&cpath, l->new_name);
+						errs = 1;
+					}
+				}
+			}
+			l = l->next;
+		}
+	}
+
+	if (cpath.nr) {
+		struct string_list_item *item;
+
+		string_list_sort(&cpath);
+		if (state->apply_verbosity > verbosity_silent) {
+			for_each_string_list_item(item, &cpath)
+				fprintf(stderr, "U %s\n", item->string);
+		}
+		string_list_clear(&cpath, 0);
+
+		rerere(0);
+	}
+
+	return errs;
+}
+
+/*
+ * Try to apply a patch.
+ *
+ * Returns:
+ *  -128 if a bad error happened (like patch unreadable)
+ *  -1 if patch did not apply and user cannot deal with it
+ *   0 if the patch applied
+ *   1 if the patch did not apply but user might fix it
+ */
+static int apply_patch(struct apply_state *state,
+		       int fd,
+		       const char *filename,
+		       int options)
+{
+	size_t offset;
+	struct strbuf buf = STRBUF_INIT; /* owns the patch text */
+	struct patch *list = NULL, **listp = &list;
+	int skipped_patch = 0;
+	int res = 0;
+
+	state->patch_input_file = filename;
+	if (read_patch_file(&buf, fd) < 0)
+		return -128;
+	offset = 0;
+	while (offset < buf.len) {
+		struct patch *patch;
+		int nr;
+
+		patch = xcalloc(1, sizeof(*patch));
+		patch->inaccurate_eof = !!(options & APPLY_OPT_INACCURATE_EOF);
+		patch->recount =  !!(options & APPLY_OPT_RECOUNT);
+		nr = parse_chunk(state, buf.buf + offset, buf.len - offset, patch);
+		if (nr < 0) {
+			free_patch(patch);
+			if (nr == -128) {
+				res = -128;
+				goto end;
+			}
+			break;
+		}
+		if (state->apply_in_reverse)
+			reverse_patches(patch);
+		if (use_patch(state, patch)) {
+			patch_stats(state, patch);
+			*listp = patch;
+			listp = &patch->next;
+		}
+		else {
+			if (state->apply_verbosity > verbosity_normal)
+				say_patch_name(stderr, _("Skipped patch '%s'."), patch);
+			free_patch(patch);
+			skipped_patch++;
+		}
+		offset += nr;
+	}
+
+	if (!list && !skipped_patch) {
+		error(_("unrecognized input"));
+		res = -128;
+		goto end;
+	}
+
+	if (state->whitespace_error && (state->ws_error_action == die_on_ws_error))
+		state->apply = 0;
+
+	state->update_index = state->check_index && state->apply;
+	if (state->update_index && state->newfd < 0) {
+		if (state->index_file)
+			state->newfd = hold_lock_file_for_update(state->lock_file,
+								 state->index_file,
+								 LOCK_DIE_ON_ERROR);
+		else
+			state->newfd = hold_locked_index(state->lock_file, 1);
+	}
+
+	if (state->check_index && read_apply_cache(state) < 0) {
+		error(_("unable to read index file"));
+		res = -128;
+		goto end;
+	}
+
+	if (state->check || state->apply) {
+		int r = check_patch_list(state, list);
+		if (r == -128) {
+			res = -128;
+			goto end;
+		}
+		if (r < 0 && !state->apply_with_reject) {
+			res = -1;
+			goto end;
+		}
+	}
+
+	if (state->apply) {
+		int write_res = write_out_results(state, list);
+		if (write_res < 0) {
+			res = -128;
+			goto end;
+		}
+		if (write_res > 0) {
+			/* with --3way, we still need to write the index out */
+			res = state->apply_with_reject ? -1 : 1;
+			goto end;
+		}
+	}
+
+	if (state->fake_ancestor &&
+	    build_fake_ancestor(state, list)) {
+		res = -128;
+		goto end;
+	}
+
+	if (state->diffstat && state->apply_verbosity > verbosity_silent)
+		stat_patch_list(state, list);
+
+	if (state->numstat && state->apply_verbosity > verbosity_silent)
+		numstat_patch_list(state, list);
+
+	if (state->summary && state->apply_verbosity > verbosity_silent)
+		summary_patch_list(list);
+
+end:
+	free_patch_list(list);
+	strbuf_release(&buf);
+	string_list_clear(&state->fn_table, 0);
+	return res;
+}
+
+static int apply_option_parse_exclude(const struct option *opt,
+				      const char *arg, int unset)
+{
+	struct apply_state *state = opt->value;
+	add_name_limit(state, arg, 1);
+	return 0;
+}
+
+static int apply_option_parse_include(const struct option *opt,
+				      const char *arg, int unset)
+{
+	struct apply_state *state = opt->value;
+	add_name_limit(state, arg, 0);
+	state->has_include = 1;
+	return 0;
+}
+
+static int apply_option_parse_p(const struct option *opt,
+				const char *arg,
+				int unset)
+{
+	struct apply_state *state = opt->value;
+	state->p_value = atoi(arg);
+	state->p_value_known = 1;
+	return 0;
+}
+
+static int apply_option_parse_space_change(const struct option *opt,
+					   const char *arg, int unset)
+{
+	struct apply_state *state = opt->value;
+	if (unset)
+		state->ws_ignore_action = ignore_ws_none;
+	else
+		state->ws_ignore_action = ignore_ws_change;
+	return 0;
+}
+
+static int apply_option_parse_whitespace(const struct option *opt,
+					 const char *arg, int unset)
+{
+	struct apply_state *state = opt->value;
+	state->whitespace_option = arg;
+	if (parse_whitespace_option(state, arg))
+		exit(1);
+	return 0;
+}
+
+static int apply_option_parse_directory(const struct option *opt,
+					const char *arg, int unset)
+{
+	struct apply_state *state = opt->value;
+	strbuf_reset(&state->root);
+	strbuf_addstr(&state->root, arg);
+	strbuf_complete(&state->root, '/');
+	return 0;
+}
+
+int apply_all_patches(struct apply_state *state,
+		      int argc,
+		      const char **argv,
+		      int options)
+{
+	int i;
+	int res;
+	int errs = 0;
+	int read_stdin = 1;
+
+	for (i = 0; i < argc; i++) {
+		const char *arg = argv[i];
+		int fd;
+
+		if (!strcmp(arg, "-")) {
+			res = apply_patch(state, 0, "<stdin>", options);
+			if (res < 0)
+				goto end;
+			errs |= res;
+			read_stdin = 0;
+			continue;
+		} else if (0 < state->prefix_length)
+			arg = prefix_filename(state->prefix,
+					      state->prefix_length,
+					      arg);
+
+		fd = open(arg, O_RDONLY);
+		if (fd < 0) {
+			error(_("can't open patch '%s': %s"), arg, strerror(errno));
+			res = -128;
+			goto end;
+		}
+		read_stdin = 0;
+		set_default_whitespace_mode(state);
+		res = apply_patch(state, fd, arg, options);
+		close(fd);
+		if (res < 0)
+			goto end;
+		errs |= res;
+	}
+	set_default_whitespace_mode(state);
+	if (read_stdin) {
+		res = apply_patch(state, 0, "<stdin>", options);
+		if (res < 0)
+			goto end;
+		errs |= res;
+	}
+
+	if (state->whitespace_error) {
+		if (state->squelch_whitespace_errors &&
+		    state->squelch_whitespace_errors < state->whitespace_error) {
+			int squelched =
+				state->whitespace_error - state->squelch_whitespace_errors;
+			warning(Q_("squelched %d whitespace error",
+				   "squelched %d whitespace errors",
+				   squelched),
+				squelched);
+		}
+		if (state->ws_error_action == die_on_ws_error) {
+			error(Q_("%d line adds whitespace errors.",
+				 "%d lines add whitespace errors.",
+				 state->whitespace_error),
+			      state->whitespace_error);
+			res = -128;
+			goto end;
+		}
+		if (state->applied_after_fixing_ws && state->apply)
+			warning("%d line%s applied after"
+				" fixing whitespace errors.",
+				state->applied_after_fixing_ws,
+				state->applied_after_fixing_ws == 1 ? "" : "s");
+		else if (state->whitespace_error)
+			warning(Q_("%d line adds whitespace errors.",
+				   "%d lines add whitespace errors.",
+				   state->whitespace_error),
+				state->whitespace_error);
+	}
+
+	if (state->update_index) {
+		res = write_locked_index(&the_index, state->lock_file, COMMIT_LOCK);
+		if (res) {
+			error(_("Unable to write new index file"));
+			res = -128;
+			goto end;
+		}
+		state->newfd = -1;
+	}
+
+	res = !!errs;
+
+end:
+	if (state->newfd >= 0) {
+		rollback_lock_file(state->lock_file);
+		state->newfd = -1;
+	}
+
+	if (state->apply_verbosity <= verbosity_silent) {
+		set_error_routine(state->saved_error_routine);
+		set_warn_routine(state->saved_warn_routine);
+	}
+
+	if (res > -1)
+		return res;
+	return (res == -1 ? 1 : 128);
+}
+
+int apply_parse_options(int argc, const char **argv,
+			struct apply_state *state,
+			int *force_apply, int *options,
+			const char * const *apply_usage)
+{
+	struct option builtin_apply_options[] = {
+		{ OPTION_CALLBACK, 0, "exclude", state, N_("path"),
+			N_("don't apply changes matching the given path"),
+			0, apply_option_parse_exclude },
+		{ OPTION_CALLBACK, 0, "include", state, N_("path"),
+			N_("apply changes matching the given path"),
+			0, apply_option_parse_include },
+		{ OPTION_CALLBACK, 'p', NULL, state, N_("num"),
+			N_("remove <num> leading slashes from traditional diff paths"),
+			0, apply_option_parse_p },
+		OPT_BOOL(0, "no-add", &state->no_add,
+			N_("ignore additions made by the patch")),
+		OPT_BOOL(0, "stat", &state->diffstat,
+			N_("instead of applying the patch, output diffstat for the input")),
+		OPT_NOOP_NOARG(0, "allow-binary-replacement"),
+		OPT_NOOP_NOARG(0, "binary"),
+		OPT_BOOL(0, "numstat", &state->numstat,
+			N_("show number of added and deleted lines in decimal notation")),
+		OPT_BOOL(0, "summary", &state->summary,
+			N_("instead of applying the patch, output a summary for the input")),
+		OPT_BOOL(0, "check", &state->check,
+			N_("instead of applying the patch, see if the patch is applicable")),
+		OPT_BOOL(0, "index", &state->check_index,
+			N_("make sure the patch is applicable to the current index")),
+		OPT_BOOL(0, "cached", &state->cached,
+			N_("apply a patch without touching the working tree")),
+		OPT_BOOL(0, "unsafe-paths", &state->unsafe_paths,
+			N_("accept a patch that touches outside the working area")),
+		OPT_BOOL(0, "apply", force_apply,
+			N_("also apply the patch (use with --stat/--summary/--check)")),
+		OPT_BOOL('3', "3way", &state->threeway,
+			 N_( "attempt three-way merge if a patch does not apply")),
+		OPT_FILENAME(0, "build-fake-ancestor", &state->fake_ancestor,
+			N_("build a temporary index based on embedded index information")),
+		/* Think twice before adding "--nul" synonym to this */
+		OPT_SET_INT('z', NULL, &state->line_termination,
+			N_("paths are separated with NUL character"), '\0'),
+		OPT_INTEGER('C', NULL, &state->p_context,
+				N_("ensure at least <n> lines of context match")),
+		{ OPTION_CALLBACK, 0, "whitespace", state, N_("action"),
+			N_("detect new or modified lines that have whitespace errors"),
+			0, apply_option_parse_whitespace },
+		{ OPTION_CALLBACK, 0, "ignore-space-change", state, NULL,
+			N_("ignore changes in whitespace when finding context"),
+			PARSE_OPT_NOARG, apply_option_parse_space_change },
+		{ OPTION_CALLBACK, 0, "ignore-whitespace", state, NULL,
+			N_("ignore changes in whitespace when finding context"),
+			PARSE_OPT_NOARG, apply_option_parse_space_change },
+		OPT_BOOL('R', "reverse", &state->apply_in_reverse,
+			N_("apply the patch in reverse")),
+		OPT_BOOL(0, "unidiff-zero", &state->unidiff_zero,
+			N_("don't expect at least one line of context")),
+		OPT_BOOL(0, "reject", &state->apply_with_reject,
+			N_("leave the rejected hunks in corresponding *.rej files")),
+		OPT_BOOL(0, "allow-overlap", &state->allow_overlap,
+			N_("allow overlapping hunks")),
+		OPT__VERBOSE(&state->apply_verbosity, N_("be verbose")),
+		OPT_BIT(0, "inaccurate-eof", options,
+			N_("tolerate incorrectly detected missing new-line at the end of file"),
+			APPLY_OPT_INACCURATE_EOF),
+		OPT_BIT(0, "recount", options,
+			N_("do not trust the line counts in the hunk headers"),
+			APPLY_OPT_RECOUNT),
+		{ OPTION_CALLBACK, 0, "directory", state, N_("root"),
+			N_("prepend <root> to all filenames"),
+			0, apply_option_parse_directory },
+		OPT_END()
+	};
+
+	return parse_options(argc, argv, state->prefix, builtin_apply_options, apply_usage, 0);
+}
diff --git a/apply.h b/apply.h
new file mode 100644
index 0000000000..b3d6783d55
--- /dev/null
+++ b/apply.h
@@ -0,0 +1,137 @@
+#ifndef APPLY_H
+#define APPLY_H
+
+enum apply_ws_error_action {
+	nowarn_ws_error,
+	warn_on_ws_error,
+	die_on_ws_error,
+	correct_ws_error
+};
+
+enum apply_ws_ignore {
+	ignore_ws_none,
+	ignore_ws_change
+};
+
+enum apply_verbosity {
+	verbosity_silent = -1,
+	verbosity_normal = 0,
+	verbosity_verbose = 1
+};
+
+/*
+ * We need to keep track of how symlinks in the preimage are
+ * manipulated by the patches.  A patch to add a/b/c where a/b
+ * is a symlink should not be allowed to affect the directory
+ * the symlink points at, but if the same patch removes a/b,
+ * it is perfectly fine, as the patch removes a/b to make room
+ * to create a directory a/b so that a/b/c can be created.
+ *
+ * See also "struct string_list symlink_changes" in "struct
+ * apply_state".
+ */
+#define APPLY_SYMLINK_GOES_AWAY 01
+#define APPLY_SYMLINK_IN_RESULT 02
+
+struct apply_state {
+	const char *prefix;
+	int prefix_length;
+
+	/* These are lock_file related */
+	struct lock_file *lock_file;
+	int newfd;
+
+	/* These control what gets looked at and modified */
+	int apply; /* this is not a dry-run */
+	int cached; /* apply to the index only */
+	int check; /* preimage must match working tree, don't actually apply */
+	int check_index; /* preimage must match the indexed version */
+	int update_index; /* check_index && apply */
+
+	/* These control cosmetic aspect of the output */
+	int diffstat; /* just show a diffstat, and don't actually apply */
+	int numstat; /* just show a numeric diffstat, and don't actually apply */
+	int summary; /* just report creation, deletion, etc, and don't actually apply */
+
+	/* These boolean parameters control how the apply is done */
+	int allow_overlap;
+	int apply_in_reverse;
+	int apply_with_reject;
+	int no_add;
+	int threeway;
+	int unidiff_zero;
+	int unsafe_paths;
+
+	/* Other non boolean parameters */
+	const char *index_file;
+	enum apply_verbosity apply_verbosity;
+	const char *fake_ancestor;
+	const char *patch_input_file;
+	int line_termination;
+	struct strbuf root;
+	int p_value;
+	int p_value_known;
+	unsigned int p_context;
+
+	/* Exclude and include path parameters */
+	struct string_list limit_by_name;
+	int has_include;
+
+	/* Various "current state" */
+	int linenr; /* current line number */
+	struct string_list symlink_changes; /* we have to track symlinks */
+
+	/*
+	 * For "diff-stat" like behaviour, we keep track of the biggest change
+	 * we've seen, and the longest filename. That allows us to do simple
+	 * scaling.
+	 */
+	int max_change;
+	int max_len;
+
+	/*
+	 * Records filenames that have been touched, in order to handle
+	 * the case where more than one patches touch the same file.
+	 */
+	struct string_list fn_table;
+
+	/*
+	 * This is to save reporting routines before using
+	 * set_error_routine() or set_warn_routine() to install muting
+	 * routines when in verbosity_silent mode.
+	 */
+	void (*saved_error_routine)(const char *err, va_list params);
+	void (*saved_warn_routine)(const char *warn, va_list params);
+
+	/* These control whitespace errors */
+	enum apply_ws_error_action ws_error_action;
+	enum apply_ws_ignore ws_ignore_action;
+	const char *whitespace_option;
+	int whitespace_error;
+	int squelch_whitespace_errors;
+	int applied_after_fixing_ws;
+};
+
+extern int apply_parse_options(int argc, const char **argv,
+			       struct apply_state *state,
+			       int *force_apply, int *options,
+			       const char * const *apply_usage);
+extern int init_apply_state(struct apply_state *state,
+			    const char *prefix,
+			    struct lock_file *lock_file);
+extern void clear_apply_state(struct apply_state *state);
+extern int check_apply_state(struct apply_state *state, int force_apply);
+
+/*
+ * Some aspects of the apply behavior are controlled by the following
+ * bits in the "options" parameter passed to apply_all_patches().
+ */
+#define APPLY_OPT_INACCURATE_EOF	(1<<0) /* accept inaccurate eof */
+#define APPLY_OPT_RECOUNT		(1<<1) /* accept inaccurate line count */
+
+extern int apply_all_patches(struct apply_state *state,
+			     int argc,
+			     const char **argv,
+			     int options);
+
+#endif
diff --git a/builtin/am.c b/builtin/am.c
index 9daeb27225..ddd23badae 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -28,6 +28,7 @@
 #include "rerere.h"
 #include "prompt.h"
 #include "mailinfo.h"
+#include "apply.h"
 #include "string-list.h"
 
 /**
@@ -1509,39 +1510,59 @@ static int parse_mail_rebase(struct am_state *state, const char *mail)
  */
 static int run_apply(const struct am_state *state, const char *index_file)
 {
-	struct child_process cp = CHILD_PROCESS_INIT;
-
-	cp.git_cmd = 1;
-
-	if (index_file)
-		argv_array_pushf(&cp.env_array, "GIT_INDEX_FILE=%s", index_file);
+	struct argv_array apply_paths = ARGV_ARRAY_INIT;
+	struct argv_array apply_opts = ARGV_ARRAY_INIT;
+	struct apply_state apply_state;
+	int res, opts_left;
+	static struct lock_file lock_file;
+	int force_apply = 0;
+	int options = 0;
+
+	if (init_apply_state(&apply_state, NULL, &lock_file))
+		die("BUG: init_apply_state() failed");
+
+	argv_array_push(&apply_opts, "apply");
+	argv_array_pushv(&apply_opts, state->git_apply_opts.argv);
+
+	opts_left = apply_parse_options(apply_opts.argc, apply_opts.argv,
+					&apply_state, &force_apply, &options,
+					NULL);
+
+	if (opts_left != 0)
+		die("unknown option passed through to git apply");
+
+	if (index_file) {
+		apply_state.index_file = index_file;
+		apply_state.cached = 1;
+	} else
+		apply_state.check_index = 1;
 
 	/*
 	 * If we are allowed to fall back on 3-way merge, don't give false
 	 * errors during the initial attempt.
 	 */
-	if (state->threeway && !index_file) {
-		cp.no_stdout = 1;
-		cp.no_stderr = 1;
-	}
+	if (state->threeway && !index_file)
+		apply_state.apply_verbosity = verbosity_silent;
 
-	argv_array_push(&cp.args, "apply");
+	if (check_apply_state(&apply_state, force_apply))
+		die("BUG: check_apply_state() failed");
 
-	argv_array_pushv(&cp.args, state->git_apply_opts.argv);
+	argv_array_push(&apply_paths, am_path(state, "patch"));
 
-	if (index_file)
-		argv_array_push(&cp.args, "--cached");
-	else
-		argv_array_push(&cp.args, "--index");
+	res = apply_all_patches(&apply_state, apply_paths.argc, apply_paths.argv, options);
 
-	argv_array_push(&cp.args, am_path(state, "patch"));
+	argv_array_clear(&apply_paths);
+	argv_array_clear(&apply_opts);
+	clear_apply_state(&apply_state);
 
-	if (run_command(&cp))
-		return -1;
+	if (res)
+		return res;
 
-	/* Reload index as git-apply will have modified it. */
-	discard_cache();
-	read_cache_from(index_file ? index_file : get_index_file());
+	if (index_file) {
+		/* Reload index as apply_all_patches() will have modified it. */
+		discard_cache();
+		read_cache_from(index_file);
+	}
 
 	return 0;
 }
diff --git a/builtin/apply.c b/builtin/apply.c
index 1a488f9e88..81b9a61c37 100644
--- a/builtin/apply.c
+++ b/builtin/apply.c
@@ -1,4793 +1,16 @@
-/*
- * apply.c
- *
- * Copyright (C) Linus Torvalds, 2005
- *
- * This applies patches on top of some (arbitrary) version of the SCM.
- *
- */
 #include "cache.h"
-#include "lockfile.h"
-#include "cache-tree.h"
-#include "quote.h"
-#include "blob.h"
-#include "delta.h"
 #include "builtin.h"
-#include "string-list.h"
-#include "dir.h"
-#include "diff.h"
 #include "parse-options.h"
-#include "xdiff-interface.h"
-#include "ll-merge.h"
-#include "rerere.h"
-
-enum ws_error_action {
-	nowarn_ws_error,
-	warn_on_ws_error,
-	die_on_ws_error,
-	correct_ws_error
-};
-
-
-enum ws_ignore {
-	ignore_ws_none,
-	ignore_ws_change
-};
-
-/*
- * We need to keep track of how symlinks in the preimage are
- * manipulated by the patches.  A patch to add a/b/c where a/b
- * is a symlink should not be allowed to affect the directory
- * the symlink points at, but if the same patch removes a/b,
- * it is perfectly fine, as the patch removes a/b to make room
- * to create a directory a/b so that a/b/c can be created.
- *
- * See also "struct string_list symlink_changes" in "struct
- * apply_state".
- */
-#define SYMLINK_GOES_AWAY 01
-#define SYMLINK_IN_RESULT 02
-
-struct apply_state {
-	const char *prefix;
-	int prefix_length;
-
-	/* These are lock_file related */
-	struct lock_file *lock_file;
-	int newfd;
-
-	/* These control what gets looked at and modified */
-	int apply; /* this is not a dry-run */
-	int cached; /* apply to the index only */
-	int check; /* preimage must match working tree, don't actually apply */
-	int check_index; /* preimage must match the indexed version */
-	int update_index; /* check_index && apply */
-
-	/* These control cosmetic aspect of the output */
-	int diffstat; /* just show a diffstat, and don't actually apply */
-	int numstat; /* just show a numeric diffstat, and don't actually apply */
-	int summary; /* just report creation, deletion, etc, and don't actually apply */
-
-	/* These boolean parameters control how the apply is done */
-	int allow_overlap;
-	int apply_in_reverse;
-	int apply_with_reject;
-	int apply_verbosely;
-	int no_add;
-	int threeway;
-	int unidiff_zero;
-	int unsafe_paths;
-
-	/* Other non boolean parameters */
-	const char *fake_ancestor;
-	const char *patch_input_file;
-	int line_termination;
-	struct strbuf root;
-	int p_value;
-	int p_value_known;
-	unsigned int p_context;
-
-	/* Exclude and include path parameters */
-	struct string_list limit_by_name;
-	int has_include;
-
-	/* Various "current state" */
-	int linenr; /* current line number */
-	struct string_list symlink_changes; /* we have to track symlinks */
-
-	/*
-	 * For "diff-stat" like behaviour, we keep track of the biggest change
-	 * we've seen, and the longest filename. That allows us to do simple
-	 * scaling.
-	 */
-	int max_change;
-	int max_len;
-
-	/*
-	 * Records filenames that have been touched, in order to handle
-	 * the case where more than one patches touch the same file.
-	 */
-	struct string_list fn_table;
-
-	/* These control whitespace errors */
-	enum ws_error_action ws_error_action;
-	enum ws_ignore ws_ignore_action;
-	const char *whitespace_option;
-	int whitespace_error;
-	int squelch_whitespace_errors;
-	int applied_after_fixing_ws;
-};
+#include "lockfile.h"
+#include "apply.h"
 
 static const char * const apply_usage[] = {
 	N_("git apply [<options>] [<patch>...]"),
 	NULL
 };
 
-static void parse_whitespace_option(struct apply_state *state, const char *option)
-{
-	if (!option) {
-		state->ws_error_action = warn_on_ws_error;
-		return;
-	}
-	if (!strcmp(option, "warn")) {
-		state->ws_error_action = warn_on_ws_error;
-		return;
-	}
-	if (!strcmp(option, "nowarn")) {
-		state->ws_error_action = nowarn_ws_error;
-		return;
-	}
-	if (!strcmp(option, "error")) {
-		state->ws_error_action = die_on_ws_error;
-		return;
-	}
-	if (!strcmp(option, "error-all")) {
-		state->ws_error_action = die_on_ws_error;
-		state->squelch_whitespace_errors = 0;
-		return;
-	}
-	if (!strcmp(option, "strip") || !strcmp(option, "fix")) {
-		state->ws_error_action = correct_ws_error;
-		return;
-	}
-	die(_("unrecognized whitespace option '%s'"), option);
-}
-
-static void parse_ignorewhitespace_option(struct apply_state *state,
-					  const char *option)
-{
-	if (!option || !strcmp(option, "no") ||
-	    !strcmp(option, "false") || !strcmp(option, "never") ||
-	    !strcmp(option, "none")) {
-		state->ws_ignore_action = ignore_ws_none;
-		return;
-	}
-	if (!strcmp(option, "change")) {
-		state->ws_ignore_action = ignore_ws_change;
-		return;
-	}
-	die(_("unrecognized whitespace ignore option '%s'"), option);
-}
-
-static void set_default_whitespace_mode(struct apply_state *state)
-{
-	if (!state->whitespace_option && !apply_default_whitespace)
-		state->ws_error_action = (state->apply ? warn_on_ws_error : nowarn_ws_error);
-}
-
-/*
- * This represents one "hunk" from a patch, starting with
- * "@@ -oldpos,oldlines +newpos,newlines @@" marker.  The
- * patch text is pointed at by patch, and its byte length
- * is stored in size.  leading and trailing are the number
- * of context lines.
- */
-struct fragment {
-	unsigned long leading, trailing;
-	unsigned long oldpos, oldlines;
-	unsigned long newpos, newlines;
-	/*
-	 * 'patch' is usually borrowed from buf in apply_patch(),
-	 * but some codepaths store an allocated buffer.
-	 */
-	const char *patch;
-	unsigned free_patch:1,
-		rejected:1;
-	int size;
-	int linenr;
-	struct fragment *next;
-};
-
-/*
- * When dealing with a binary patch, we reuse "leading" field
- * to store the type of the binary hunk, either deflated "delta"
- * or deflated "literal".
- */
-#define binary_patch_method leading
-#define BINARY_DELTA_DEFLATED	1
-#define BINARY_LITERAL_DEFLATED 2
-
-/*
- * This represents a "patch" to a file, both metainfo changes
- * such as creation/deletion, filemode and content changes represented
- * as a series of fragments.
- */
-struct patch {
-	char *new_name, *old_name, *def_name;
-	unsigned int old_mode, new_mode;
-	int is_new, is_delete;	/* -1 = unknown, 0 = false, 1 = true */
-	int rejected;
-	unsigned ws_rule;
-	int lines_added, lines_deleted;
-	int score;
-	unsigned int is_toplevel_relative:1;
-	unsigned int inaccurate_eof:1;
-	unsigned int is_binary:1;
-	unsigned int is_copy:1;
-	unsigned int is_rename:1;
-	unsigned int recount:1;
-	unsigned int conflicted_threeway:1;
-	unsigned int direct_to_threeway:1;
-	struct fragment *fragments;
-	char *result;
-	size_t resultsize;
-	char old_sha1_prefix[41];
-	char new_sha1_prefix[41];
-	struct patch *next;
-
-	/* three-way fallback result */
-	struct object_id threeway_stage[3];
-};
-
-static void free_fragment_list(struct fragment *list)
-{
-	while (list) {
-		struct fragment *next = list->next;
-		if (list->free_patch)
-			free((char *)list->patch);
-		free(list);
-		list = next;
-	}
-}
-
-static void free_patch(struct patch *patch)
-{
-	free_fragment_list(patch->fragments);
-	free(patch->def_name);
-	free(patch->old_name);
-	free(patch->new_name);
-	free(patch->result);
-	free(patch);
-}
-
-static void free_patch_list(struct patch *list)
-{
-	while (list) {
-		struct patch *next = list->next;
-		free_patch(list);
-		list = next;
-	}
-}
-
-/*
- * A line in a file, len-bytes long (includes the terminating LF,
- * except for an incomplete line at the end if the file ends with
- * one), and its contents hashes to 'hash'.
- */
-struct line {
-	size_t len;
-	unsigned hash : 24;
-	unsigned flag : 8;
-#define LINE_COMMON     1
-#define LINE_PATCHED	2
-};
-
-/*
- * This represents a "file", which is an array of "lines".
- */
-struct image {
-	char *buf;
-	size_t len;
-	size_t nr;
-	size_t alloc;
-	struct line *line_allocated;
-	struct line *line;
-};
-
-static uint32_t hash_line(const char *cp, size_t len)
-{
-	size_t i;
-	uint32_t h;
-	for (i = 0, h = 0; i < len; i++) {
-		if (!isspace(cp[i])) {
-			h = h * 3 + (cp[i] & 0xff);
-		}
-	}
-	return h;
-}
-
-/*
- * Compare lines s1 of length n1 and s2 of length n2, ignoring
- * whitespace difference. Returns 1 if they match, 0 otherwise
- */
-static int fuzzy_matchlines(const char *s1, size_t n1,
-			    const char *s2, size_t n2)
-{
-	const char *last1 = s1 + n1 - 1;
-	const char *last2 = s2 + n2 - 1;
-	int result = 0;
-
-	/* ignore line endings */
-	while ((*last1 == '\r') || (*last1 == '\n'))
-		last1--;
-	while ((*last2 == '\r') || (*last2 == '\n'))
-		last2--;
-
-	/* skip leading whitespaces, if both begin with whitespace */
-	if (s1 <= last1 && s2 <= last2 && isspace(*s1) && isspace(*s2)) {
-		while (isspace(*s1) && (s1 <= last1))
-			s1++;
-		while (isspace(*s2) && (s2 <= last2))
-			s2++;
-	}
-	/* early return if both lines are empty */
-	if ((s1 > last1) && (s2 > last2))
-		return 1;
-	while (!result) {
-		result = *s1++ - *s2++;
-		/*
-		 * Skip whitespace inside. We check for whitespace on
-		 * both buffers because we don't want "a b" to match
-		 * "ab"
-		 */
-		if (isspace(*s1) && isspace(*s2)) {
-			while (isspace(*s1) && s1 <= last1)
-				s1++;
-			while (isspace(*s2) && s2 <= last2)
-				s2++;
-		}
-		/*
-		 * If we reached the end on one side only,
-		 * lines don't match
-		 */
-		if (
-		    ((s2 > last2) && (s1 <= last1)) ||
-		    ((s1 > last1) && (s2 <= last2)))
-			return 0;
-		if ((s1 > last1) && (s2 > last2))
-			break;
-	}
-
-	return !result;
-}
-
-static void add_line_info(struct image *img, const char *bol, size_t len, unsigned flag)
-{
-	ALLOC_GROW(img->line_allocated, img->nr + 1, img->alloc);
-	img->line_allocated[img->nr].len = len;
-	img->line_allocated[img->nr].hash = hash_line(bol, len);
-	img->line_allocated[img->nr].flag = flag;
-	img->nr++;
-}
-
-/*
- * "buf" has the file contents to be patched (read from various sources).
- * attach it to "image" and add line-based index to it.
- * "image" now owns the "buf".
- */
-static void prepare_image(struct image *image, char *buf, size_t len,
-			  int prepare_linetable)
-{
-	const char *cp, *ep;
-
-	memset(image, 0, sizeof(*image));
-	image->buf = buf;
-	image->len = len;
-
-	if (!prepare_linetable)
-		return;
-
-	ep = image->buf + image->len;
-	cp = image->buf;
-	while (cp < ep) {
-		const char *next;
-		for (next = cp; next < ep && *next != '\n'; next++)
-			;
-		if (next < ep)
-			next++;
-		add_line_info(image, cp, next - cp, 0);
-		cp = next;
-	}
-	image->line = image->line_allocated;
-}
-
-static void clear_image(struct image *image)
-{
-	free(image->buf);
-	free(image->line_allocated);
-	memset(image, 0, sizeof(*image));
-}
-
-/* fmt must contain _one_ %s and no other substitution */
-static void say_patch_name(FILE *output, const char *fmt, struct patch *patch)
-{
-	struct strbuf sb = STRBUF_INIT;
-
-	if (patch->old_name && patch->new_name &&
-	    strcmp(patch->old_name, patch->new_name)) {
-		quote_c_style(patch->old_name, &sb, NULL, 0);
-		strbuf_addstr(&sb, " => ");
-		quote_c_style(patch->new_name, &sb, NULL, 0);
-	} else {
-		const char *n = patch->new_name;
-		if (!n)
-			n = patch->old_name;
-		quote_c_style(n, &sb, NULL, 0);
-	}
-	fprintf(output, fmt, sb.buf);
-	fputc('\n', output);
-	strbuf_release(&sb);
-}
-
-#define SLOP (16)
-
-static void read_patch_file(struct strbuf *sb, int fd)
-{
-	if (strbuf_read(sb, fd, 0) < 0)
-		die_errno("git apply: failed to read");
-
-	/*
-	 * Make sure that we have some slop in the buffer
-	 * so that we can do speculative "memcmp" etc, and
-	 * see to it that it is NUL-filled.
-	 */
-	strbuf_grow(sb, SLOP);
-	memset(sb->buf + sb->len, 0, SLOP);
-}
-
-static unsigned long linelen(const char *buffer, unsigned long size)
-{
-	unsigned long len = 0;
-	while (size--) {
-		len++;
-		if (*buffer++ == '\n')
-			break;
-	}
-	return len;
-}
-
-static int is_dev_null(const char *str)
-{
-	return skip_prefix(str, "/dev/null", &str) && isspace(*str);
-}
-
-#define TERM_SPACE	1
-#define TERM_TAB	2
-
-static int name_terminate(int c, int terminate)
-{
-	if (c == ' ' && !(terminate & TERM_SPACE))
-		return 0;
-	if (c == '\t' && !(terminate & TERM_TAB))
-		return 0;
-
-	return 1;
-}
-
-/* remove double slashes to make --index work with such filenames */
-static char *squash_slash(char *name)
-{
-	int i = 0, j = 0;
-
-	if (!name)
-		return NULL;
-
-	while (name[i]) {
-		if ((name[j++] = name[i++]) == '/')
-			while (name[i] == '/')
-				i++;
-	}
-	name[j] = '\0';
-	return name;
-}
-
-static char *find_name_gnu(struct apply_state *state,
-			   const char *line,
-			   const char *def,
-			   int p_value)
-{
-	struct strbuf name = STRBUF_INIT;
-	char *cp;
-
-	/*
-	 * Proposed "new-style" GNU patch/diff format; see
-	 * http://marc.info/?l=git&m=112927316408690&w=2
-	 */
-	if (unquote_c_style(&name, line, NULL)) {
-		strbuf_release(&name);
-		return NULL;
-	}
-
-	for (cp = name.buf; p_value; p_value--) {
-		cp = strchr(cp, '/');
-		if (!cp) {
-			strbuf_release(&name);
-			return NULL;
-		}
-		cp++;
-	}
-
-	strbuf_remove(&name, 0, cp - name.buf);
-	if (state->root.len)
-		strbuf_insert(&name, 0, state->root.buf, state->root.len);
-	return squash_slash(strbuf_detach(&name, NULL));
-}
-
-static size_t sane_tz_len(const char *line, size_t len)
-{
-	const char *tz, *p;
-
-	if (len < strlen(" +0500") || line[len-strlen(" +0500")] != ' ')
-		return 0;
-	tz = line + len - strlen(" +0500");
-
-	if (tz[1] != '+' && tz[1] != '-')
-		return 0;
-
-	for (p = tz + 2; p != line + len; p++)
-		if (!isdigit(*p))
-			return 0;
-
-	return line + len - tz;
-}
-
-static size_t tz_with_colon_len(const char *line, size_t len)
-{
-	const char *tz, *p;
-
-	if (len < strlen(" +08:00") || line[len - strlen(":00")] != ':')
-		return 0;
-	tz = line + len - strlen(" +08:00");
-
-	if (tz[0] != ' ' || (tz[1] != '+' && tz[1] != '-'))
-		return 0;
-	p = tz + 2;
-	if (!isdigit(*p++) || !isdigit(*p++) || *p++ != ':' ||
-	    !isdigit(*p++) || !isdigit(*p++))
-		return 0;
-
-	return line + len - tz;
-}
-
-static size_t date_len(const char *line, size_t len)
-{
-	const char *date, *p;
-
-	if (len < strlen("72-02-05") || line[len-strlen("-05")] != '-')
-		return 0;
-	p = date = line + len - strlen("72-02-05");
-
-	if (!isdigit(*p++) || !isdigit(*p++) || *p++ != '-' ||
-	    !isdigit(*p++) || !isdigit(*p++) || *p++ != '-' ||
-	    !isdigit(*p++) || !isdigit(*p++))	/* Not a date. */
-		return 0;
-
-	if (date - line >= strlen("19") &&
-	    isdigit(date[-1]) && isdigit(date[-2]))	/* 4-digit year */
-		date -= strlen("19");
-
-	return line + len - date;
-}
-
-static size_t short_time_len(const char *line, size_t len)
-{
-	const char *time, *p;
-
-	if (len < strlen(" 07:01:32") || line[len-strlen(":32")] != ':')
-		return 0;
-	p = time = line + len - strlen(" 07:01:32");
-
-	/* Permit 1-digit hours? */
-	if (*p++ != ' ' ||
-	    !isdigit(*p++) || !isdigit(*p++) || *p++ != ':' ||
-	    !isdigit(*p++) || !isdigit(*p++) || *p++ != ':' ||
-	    !isdigit(*p++) || !isdigit(*p++))	/* Not a time. */
-		return 0;
-
-	return line + len - time;
-}
-
-static size_t fractional_time_len(const char *line, size_t len)
-{
-	const char *p;
-	size_t n;
-
-	/* Expected format: 19:41:17.620000023 */
-	if (!len || !isdigit(line[len - 1]))
-		return 0;
-	p = line + len - 1;
-
-	/* Fractional seconds. */
-	while (p > line && isdigit(*p))
-		p--;
-	if (*p != '.')
-		return 0;
-
-	/* Hours, minutes, and whole seconds. */
-	n = short_time_len(line, p - line);
-	if (!n)
-		return 0;
-
-	return line + len - p + n;
-}
-
-static size_t trailing_spaces_len(const char *line, size_t len)
-{
-	const char *p;
-
-	/* Expected format: ' ' x (1 or more)  */
-	if (!len || line[len - 1] != ' ')
-		return 0;
-
-	p = line + len;
-	while (p != line) {
-		p--;
-		if (*p != ' ')
-			return line + len - (p + 1);
-	}
-
-	/* All spaces! */
-	return len;
-}
-
-static size_t diff_timestamp_len(const char *line, size_t len)
-{
-	const char *end = line + len;
-	size_t n;
-
-	/*
-	 * Posix: 2010-07-05 19:41:17
-	 * GNU: 2010-07-05 19:41:17.620000023 -0500
-	 */
-
-	if (!isdigit(end[-1]))
-		return 0;
-
-	n = sane_tz_len(line, end - line);
-	if (!n)
-		n = tz_with_colon_len(line, end - line);
-	end -= n;
-
-	n = short_time_len(line, end - line);
-	if (!n)
-		n = fractional_time_len(line, end - line);
-	end -= n;
-
-	n = date_len(line, end - line);
-	if (!n)	/* No date.  Too bad. */
-		return 0;
-	end -= n;
-
-	if (end == line)	/* No space before date. */
-		return 0;
-	if (end[-1] == '\t') {	/* Success! */
-		end--;
-		return line + len - end;
-	}
-	if (end[-1] != ' ')	/* No space before date. */
-		return 0;
-
-	/* Whitespace damage. */
-	end -= trailing_spaces_len(line, end - line);
-	return line + len - end;
-}
-
-static char *find_name_common(struct apply_state *state,
-			      const char *line,
-			      const char *def,
-			      int p_value,
-			      const char *end,
-			      int terminate)
-{
-	int len;
-	const char *start = NULL;
-
-	if (p_value == 0)
-		start = line;
-	while (line != end) {
-		char c = *line;
-
-		if (!end && isspace(c)) {
-			if (c == '\n')
-				break;
-			if (name_terminate(c, terminate))
-				break;
-		}
-		line++;
-		if (c == '/' && !--p_value)
-			start = line;
-	}
-	if (!start)
-		return squash_slash(xstrdup_or_null(def));
-	len = line - start;
-	if (!len)
-		return squash_slash(xstrdup_or_null(def));
-
-	/*
-	 * Generally we prefer the shorter name, especially
-	 * if the other one is just a variation of that with
-	 * something else tacked on to the end (ie "file.orig"
-	 * or "file~").
-	 */
-	if (def) {
-		int deflen = strlen(def);
-		if (deflen < len && !strncmp(start, def, deflen))
-			return squash_slash(xstrdup(def));
-	}
-
-	if (state->root.len) {
-		char *ret = xstrfmt("%s%.*s", state->root.buf, len, start);
-		return squash_slash(ret);
-	}
-
-	return squash_slash(xmemdupz(start, len));
-}
-
-static char *find_name(struct apply_state *state,
-		       const char *line,
-		       char *def,
-		       int p_value,
-		       int terminate)
-{
-	if (*line == '"') {
-		char *name = find_name_gnu(state, line, def, p_value);
-		if (name)
-			return name;
-	}
-
-	return find_name_common(state, line, def, p_value, NULL, terminate);
-}
-
-static char *find_name_traditional(struct apply_state *state,
-				   const char *line,
-				   char *def,
-				   int p_value)
-{
-	size_t len;
-	size_t date_len;
-
-	if (*line == '"') {
-		char *name = find_name_gnu(state, line, def, p_value);
-		if (name)
-			return name;
-	}
-
-	len = strchrnul(line, '\n') - line;
-	date_len = diff_timestamp_len(line, len);
-	if (!date_len)
-		return find_name_common(state, line, def, p_value, NULL, TERM_TAB);
-	len -= date_len;
-
-	return find_name_common(state, line, def, p_value, line + len, 0);
-}
-
-static int count_slashes(const char *cp)
-{
-	int cnt = 0;
-	char ch;
-
-	while ((ch = *cp++))
-		if (ch == '/')
-			cnt++;
-	return cnt;
-}
-
-/*
- * Given the string after "--- " or "+++ ", guess the appropriate
- * p_value for the given patch.
- */
-static int guess_p_value(struct apply_state *state, const char *nameline)
-{
-	char *name, *cp;
-	int val = -1;
-
-	if (is_dev_null(nameline))
-		return -1;
-	name = find_name_traditional(state, nameline, NULL, 0);
-	if (!name)
-		return -1;
-	cp = strchr(name, '/');
-	if (!cp)
-		val = 0;
-	else if (state->prefix) {
-		/*
-		 * Does it begin with "a/$our-prefix" and such?  Then this is
-		 * very likely to apply to our directory.
-		 */
-		if (!strncmp(name, state->prefix, state->prefix_length))
-			val = count_slashes(state->prefix);
-		else {
-			cp++;
-			if (!strncmp(cp, state->prefix, state->prefix_length))
-				val = count_slashes(state->prefix) + 1;
-		}
-	}
-	free(name);
-	return val;
-}
-
-/*
- * Does the ---/+++ line have the POSIX timestamp after the last HT?
- * GNU diff puts epoch there to signal a creation/deletion event.  Is
- * this such a timestamp?
- */
-static int has_epoch_timestamp(const char *nameline)
-{
-	/*
-	 * We are only interested in epoch timestamp; any non-zero
-	 * fraction cannot be one, hence "(\.0+)?" in the regexp below.
-	 * For the same reason, the date must be either 1969-12-31 or
-	 * 1970-01-01, and the seconds part must be "00".
-	 */
-	const char stamp_regexp[] =
-		"^(1969-12-31|1970-01-01)"
-		" "
-		"[0-2][0-9]:[0-5][0-9]:00(\\.0+)?"
-		" "
-		"([-+][0-2][0-9]:?[0-5][0-9])\n";
-	const char *timestamp = NULL, *cp, *colon;
-	static regex_t *stamp;
-	regmatch_t m[10];
-	int zoneoffset;
-	int hourminute;
-	int status;
-
-	for (cp = nameline; *cp != '\n'; cp++) {
-		if (*cp == '\t')
-			timestamp = cp + 1;
-	}
-	if (!timestamp)
-		return 0;
-	if (!stamp) {
-		stamp = xmalloc(sizeof(*stamp));
-		if (regcomp(stamp, stamp_regexp, REG_EXTENDED)) {
-			warning(_("Cannot prepare timestamp regexp %s"),
-				stamp_regexp);
-			return 0;
-		}
-	}
-
-	status = regexec(stamp, timestamp, ARRAY_SIZE(m), m, 0);
-	if (status) {
-		if (status != REG_NOMATCH)
-			warning(_("regexec returned %d for input: %s"),
-				status, timestamp);
-		return 0;
-	}
-
-	zoneoffset = strtol(timestamp + m[3].rm_so + 1, (char **) &colon, 10);
-	if (*colon == ':')
-		zoneoffset = zoneoffset * 60 + strtol(colon + 1, NULL, 10);
-	else
-		zoneoffset = (zoneoffset / 100) * 60 + (zoneoffset % 100);
-	if (timestamp[m[3].rm_so] == '-')
-		zoneoffset = -zoneoffset;
-
-	/*
-	 * YYYY-MM-DD hh:mm:ss must be from either 1969-12-31
-	 * (west of GMT) or 1970-01-01 (east of GMT)
-	 */
-	if ((zoneoffset < 0 && memcmp(timestamp, "1969-12-31", 10)) ||
-	    (0 <= zoneoffset && memcmp(timestamp, "1970-01-01", 10)))
-		return 0;
-
-	hourminute = (strtol(timestamp + 11, NULL, 10) * 60 +
-		      strtol(timestamp + 14, NULL, 10) -
-		      zoneoffset);
-
-	return ((zoneoffset < 0 && hourminute == 1440) ||
-		(0 <= zoneoffset && !hourminute));
-}
-
-/*
- * Get the name etc info from the ---/+++ lines of a traditional patch header
- *
- * FIXME! The end-of-filename heuristics are kind of screwy. For existing
- * files, we can happily check the index for a match, but for creating a
- * new file we should try to match whatever "patch" does. I have no idea.
- */
-static void parse_traditional_patch(struct apply_state *state,
-				    const char *first,
-				    const char *second,
-				    struct patch *patch)
-{
-	char *name;
-
-	first += 4;	/* skip "--- " */
-	second += 4;	/* skip "+++ " */
-	if (!state->p_value_known) {
-		int p, q;
-		p = guess_p_value(state, first);
-		q = guess_p_value(state, second);
-		if (p < 0) p = q;
-		if (0 <= p && p == q) {
-			state->p_value = p;
-			state->p_value_known = 1;
-		}
-	}
-	if (is_dev_null(first)) {
-		patch->is_new = 1;
-		patch->is_delete = 0;
-		name = find_name_traditional(state, second, NULL, state->p_value);
-		patch->new_name = name;
-	} else if (is_dev_null(second)) {
-		patch->is_new = 0;
-		patch->is_delete = 1;
-		name = find_name_traditional(state, first, NULL, state->p_value);
-		patch->old_name = name;
-	} else {
-		char *first_name;
-		first_name = find_name_traditional(state, first, NULL, state->p_value);
-		name = find_name_traditional(state, second, first_name, state->p_value);
-		free(first_name);
-		if (has_epoch_timestamp(first)) {
-			patch->is_new = 1;
-			patch->is_delete = 0;
-			patch->new_name = name;
-		} else if (has_epoch_timestamp(second)) {
-			patch->is_new = 0;
-			patch->is_delete = 1;
-			patch->old_name = name;
-		} else {
-			patch->old_name = name;
-			patch->new_name = xstrdup_or_null(name);
-		}
-	}
-	if (!name)
-		die(_("unable to find filename in patch at line %d"), state->linenr);
-}
-
-static int gitdiff_hdrend(struct apply_state *state,
-			  const char *line,
-			  struct patch *patch)
-{
-	return -1;
-}
-
-/*
- * We're anal about diff header consistency, to make
- * sure that we don't end up having strange ambiguous
- * patches floating around.
- *
- * As a result, gitdiff_{old|new}name() will check
- * their names against any previous information, just
- * to make sure..
- */
-#define DIFF_OLD_NAME 0
-#define DIFF_NEW_NAME 1
-
-static void gitdiff_verify_name(struct apply_state *state,
-				const char *line,
-				int isnull,
-				char **name,
-				int side)
-{
-	if (!*name && !isnull) {
-		*name = find_name(state, line, NULL, state->p_value, TERM_TAB);
-		return;
-	}
-
-	if (*name) {
-		int len = strlen(*name);
-		char *another;
-		if (isnull)
-			die(_("git apply: bad git-diff - expected /dev/null, got %s on line %d"),
-			    *name, state->linenr);
-		another = find_name(state, line, NULL, state->p_value, TERM_TAB);
-		if (!another || memcmp(another, *name, len + 1))
-			die((side == DIFF_NEW_NAME) ?
-			    _("git apply: bad git-diff - inconsistent new filename on line %d") :
-			    _("git apply: bad git-diff - inconsistent old filename on line %d"), state->linenr);
-		free(another);
-	} else {
-		/* expect "/dev/null" */
-		if (memcmp("/dev/null", line, 9) || line[9] != '\n')
-			die(_("git apply: bad git-diff - expected /dev/null on line %d"), state->linenr);
-	}
-}
-
-static int gitdiff_oldname(struct apply_state *state,
-			   const char *line,
-			   struct patch *patch)
-{
-	gitdiff_verify_name(state, line,
-			    patch->is_new, &patch->old_name,
-			    DIFF_OLD_NAME);
-	return 0;
-}
-
-static int gitdiff_newname(struct apply_state *state,
-			   const char *line,
-			   struct patch *patch)
-{
-	gitdiff_verify_name(state, line,
-			    patch->is_delete, &patch->new_name,
-			    DIFF_NEW_NAME);
-	return 0;
-}
-
-static int gitdiff_oldmode(struct apply_state *state,
-			   const char *line,
-			   struct patch *patch)
-{
-	patch->old_mode = strtoul(line, NULL, 8);
-	return 0;
-}
-
-static int gitdiff_newmode(struct apply_state *state,
-			   const char *line,
-			   struct patch *patch)
-{
-	patch->new_mode = strtoul(line, NULL, 8);
-	return 0;
-}
-
-static int gitdiff_delete(struct apply_state *state,
-			  const char *line,
-			  struct patch *patch)
-{
-	patch->is_delete = 1;
-	free(patch->old_name);
-	patch->old_name = xstrdup_or_null(patch->def_name);
-	return gitdiff_oldmode(state, line, patch);
-}
-
-static int gitdiff_newfile(struct apply_state *state,
-			   const char *line,
-			   struct patch *patch)
-{
-	patch->is_new = 1;
-	free(patch->new_name);
-	patch->new_name = xstrdup_or_null(patch->def_name);
-	return gitdiff_newmode(state, line, patch);
-}
-
-static int gitdiff_copysrc(struct apply_state *state,
-			   const char *line,
-			   struct patch *patch)
-{
-	patch->is_copy = 1;
-	free(patch->old_name);
-	patch->old_name = find_name(state, line, NULL, state->p_value ? state->p_value - 1 : 0, 0);
-	return 0;
-}
-
-static int gitdiff_copydst(struct apply_state *state,
-			   const char *line,
-			   struct patch *patch)
-{
-	patch->is_copy = 1;
-	free(patch->new_name);
-	patch->new_name = find_name(state, line, NULL, state->p_value ? state->p_value - 1 : 0, 0);
-	return 0;
-}
-
-static int gitdiff_renamesrc(struct apply_state *state,
-			     const char *line,
-			     struct patch *patch)
-{
-	patch->is_rename = 1;
-	free(patch->old_name);
-	patch->old_name = find_name(state, line, NULL, state->p_value ? state->p_value - 1 : 0, 0);
-	return 0;
-}
-
-static int gitdiff_renamedst(struct apply_state *state,
-			     const char *line,
-			     struct patch *patch)
-{
-	patch->is_rename = 1;
-	free(patch->new_name);
-	patch->new_name = find_name(state, line, NULL, state->p_value ? state->p_value - 1 : 0, 0);
-	return 0;
-}
-
-static int gitdiff_similarity(struct apply_state *state,
-			      const char *line,
-			      struct patch *patch)
-{
-	unsigned long val = strtoul(line, NULL, 10);
-	if (val <= 100)
-		patch->score = val;
-	return 0;
-}
-
-static int gitdiff_dissimilarity(struct apply_state *state,
-				 const char *line,
-				 struct patch *patch)
-{
-	unsigned long val = strtoul(line, NULL, 10);
-	if (val <= 100)
-		patch->score = val;
-	return 0;
-}
-
-static int gitdiff_index(struct apply_state *state,
-			 const char *line,
-			 struct patch *patch)
-{
-	/*
-	 * index line is N hexadecimal, "..", N hexadecimal,
-	 * and optional space with octal mode.
-	 */
-	const char *ptr, *eol;
-	int len;
-
-	ptr = strchr(line, '.');
-	if (!ptr || ptr[1] != '.' || 40 < ptr - line)
-		return 0;
-	len = ptr - line;
-	memcpy(patch->old_sha1_prefix, line, len);
-	patch->old_sha1_prefix[len] = 0;
-
-	line = ptr + 2;
-	ptr = strchr(line, ' ');
-	eol = strchrnul(line, '\n');
-
-	if (!ptr || eol < ptr)
-		ptr = eol;
-	len = ptr - line;
-
-	if (40 < len)
-		return 0;
-	memcpy(patch->new_sha1_prefix, line, len);
-	patch->new_sha1_prefix[len] = 0;
-	if (*ptr == ' ')
-		patch->old_mode = strtoul(ptr+1, NULL, 8);
-	return 0;
-}
-
-/*
- * This is normal for a diff that doesn't change anything: we'll fall through
- * into the next diff. Tell the parser to break out.
- */
-static int gitdiff_unrecognized(struct apply_state *state,
-				const char *line,
-				struct patch *patch)
-{
-	return -1;
-}
-
-/*
- * Skip p_value leading components from "line"; as we do not accept
- * absolute paths, return NULL in that case.
- */
-static const char *skip_tree_prefix(struct apply_state *state,
-				    const char *line,
-				    int llen)
-{
-	int nslash;
-	int i;
-
-	if (!state->p_value)
-		return (llen && line[0] == '/') ? NULL : line;
-
-	nslash = state->p_value;
-	for (i = 0; i < llen; i++) {
-		int ch = line[i];
-		if (ch == '/' && --nslash <= 0)
-			return (i == 0) ? NULL : &line[i + 1];
-	}
-	return NULL;
-}
-
-/*
- * This is to extract the same name that appears on "diff --git"
- * line.  We do not find and return anything if it is a rename
- * patch, and it is OK because we will find the name elsewhere.
- * We need to reliably find name only when it is mode-change only,
- * creation or deletion of an empty file.  In any of these cases,
- * both sides are the same name under a/ and b/ respectively.
- */
-static char *git_header_name(struct apply_state *state,
-			     const char *line,
-			     int llen)
-{
-	const char *name;
-	const char *second = NULL;
-	size_t len, line_len;
-
-	line += strlen("diff --git ");
-	llen -= strlen("diff --git ");
-
-	if (*line == '"') {
-		const char *cp;
-		struct strbuf first = STRBUF_INIT;
-		struct strbuf sp = STRBUF_INIT;
-
-		if (unquote_c_style(&first, line, &second))
-			goto free_and_fail1;
-
-		/* strip the a/b prefix including trailing slash */
-		cp = skip_tree_prefix(state, first.buf, first.len);
-		if (!cp)
-			goto free_and_fail1;
-		strbuf_remove(&first, 0, cp - first.buf);
-
-		/*
-		 * second points at one past closing dq of name.
-		 * find the second name.
-		 */
-		while ((second < line + llen) && isspace(*second))
-			second++;
-
-		if (line + llen <= second)
-			goto free_and_fail1;
-		if (*second == '"') {
-			if (unquote_c_style(&sp, second, NULL))
-				goto free_and_fail1;
-			cp = skip_tree_prefix(state, sp.buf, sp.len);
-			if (!cp)
-				goto free_and_fail1;
-			/* They must match, otherwise ignore */
-			if (strcmp(cp, first.buf))
-				goto free_and_fail1;
-			strbuf_release(&sp);
-			return strbuf_detach(&first, NULL);
-		}
-
-		/* unquoted second */
-		cp = skip_tree_prefix(state, second, line + llen - second);
-		if (!cp)
-			goto free_and_fail1;
-		if (line + llen - cp != first.len ||
-		    memcmp(first.buf, cp, first.len))
-			goto free_and_fail1;
-		return strbuf_detach(&first, NULL);
-
-	free_and_fail1:
-		strbuf_release(&first);
-		strbuf_release(&sp);
-		return NULL;
-	}
-
-	/* unquoted first name */
-	name = skip_tree_prefix(state, line, llen);
-	if (!name)
-		return NULL;
-
-	/*
-	 * since the first name is unquoted, a dq if exists must be
-	 * the beginning of the second name.
-	 */
-	for (second = name; second < line + llen; second++) {
-		if (*second == '"') {
-			struct strbuf sp = STRBUF_INIT;
-			const char *np;
-
-			if (unquote_c_style(&sp, second, NULL))
-				goto free_and_fail2;
-
-			np = skip_tree_prefix(state, sp.buf, sp.len);
-			if (!np)
-				goto free_and_fail2;
-
-			len = sp.buf + sp.len - np;
-			if (len < second - name &&
-			    !strncmp(np, name, len) &&
-			    isspace(name[len])) {
-				/* Good */
-				strbuf_remove(&sp, 0, np - sp.buf);
-				return strbuf_detach(&sp, NULL);
-			}
-
-		free_and_fail2:
-			strbuf_release(&sp);
-			return NULL;
-		}
-	}
-
-	/*
-	 * Accept a name only if it shows up twice, exactly the same
-	 * form.
-	 */
-	second = strchr(name, '\n');
-	if (!second)
-		return NULL;
-	line_len = second - name;
-	for (len = 0 ; ; len++) {
-		switch (name[len]) {
-		default:
-			continue;
-		case '\n':
-			return NULL;
-		case '\t': case ' ':
-			/*
-			 * Is this the separator between the preimage
-			 * and the postimage pathname?  Again, we are
-			 * only interested in the case where there is
-			 * no rename, as this is only to set def_name
-			 * and a rename patch has the names elsewhere
-			 * in an unambiguous form.
-			 */
-			if (!name[len + 1])
-				return NULL; /* no postimage name */
-			second = skip_tree_prefix(state, name + len + 1,
-						  line_len - (len + 1));
-			if (!second)
-				return NULL;
-			/*
-			 * Does len bytes starting at "name" and "second"
-			 * (that are separated by one HT or SP we just
-			 * found) exactly match?
-			 */
-			if (second[len] == '\n' && !strncmp(name, second, len))
-				return xmemdupz(name, len);
-		}
-	}
-}
-
-/* Verify that we recognize the lines following a git header */
-static int parse_git_header(struct apply_state *state,
-			    const char *line,
-			    int len,
-			    unsigned int size,
-			    struct patch *patch)
-{
-	unsigned long offset;
-
-	/* A git diff has explicit new/delete information, so we don't guess */
-	patch->is_new = 0;
-	patch->is_delete = 0;
-
-	/*
-	 * Some things may not have the old name in the
-	 * rest of the headers anywhere (pure mode changes,
-	 * or removing or adding empty files), so we get
-	 * the default name from the header.
-	 */
-	patch->def_name = git_header_name(state, line, len);
-	if (patch->def_name && state->root.len) {
-		char *s = xstrfmt("%s%s", state->root.buf, patch->def_name);
-		free(patch->def_name);
-		patch->def_name = s;
-	}
-
-	line += len;
-	size -= len;
-	state->linenr++;
-	for (offset = len ; size > 0 ; offset += len, size -= len, line += len, state->linenr++) {
-		static const struct opentry {
-			const char *str;
-			int (*fn)(struct apply_state *, const char *, struct patch *);
-		} optable[] = {
-			{ "@@ -", gitdiff_hdrend },
-			{ "--- ", gitdiff_oldname },
-			{ "+++ ", gitdiff_newname },
-			{ "old mode ", gitdiff_oldmode },
-			{ "new mode ", gitdiff_newmode },
-			{ "deleted file mode ", gitdiff_delete },
-			{ "new file mode ", gitdiff_newfile },
-			{ "copy from ", gitdiff_copysrc },
-			{ "copy to ", gitdiff_copydst },
-			{ "rename old ", gitdiff_renamesrc },
-			{ "rename new ", gitdiff_renamedst },
-			{ "rename from ", gitdiff_renamesrc },
-			{ "rename to ", gitdiff_renamedst },
-			{ "similarity index ", gitdiff_similarity },
-			{ "dissimilarity index ", gitdiff_dissimilarity },
-			{ "index ", gitdiff_index },
-			{ "", gitdiff_unrecognized },
-		};
-		int i;
-
-		len = linelen(line, size);
-		if (!len || line[len-1] != '\n')
-			break;
-		for (i = 0; i < ARRAY_SIZE(optable); i++) {
-			const struct opentry *p = optable + i;
-			int oplen = strlen(p->str);
-			if (len < oplen || memcmp(p->str, line, oplen))
-				continue;
-			if (p->fn(state, line + oplen, patch) < 0)
-				return offset;
-			break;
-		}
-	}
-
-	return offset;
-}
-
-static int parse_num(const char *line, unsigned long *p)
-{
-	char *ptr;
-
-	if (!isdigit(*line))
-		return 0;
-	*p = strtoul(line, &ptr, 10);
-	return ptr - line;
-}
-
-static int parse_range(const char *line, int len, int offset, const char *expect,
-		       unsigned long *p1, unsigned long *p2)
-{
-	int digits, ex;
-
-	if (offset < 0 || offset >= len)
-		return -1;
-	line += offset;
-	len -= offset;
-
-	digits = parse_num(line, p1);
-	if (!digits)
-		return -1;
-
-	offset += digits;
-	line += digits;
-	len -= digits;
-
-	*p2 = 1;
-	if (*line == ',') {
-		digits = parse_num(line+1, p2);
-		if (!digits)
-			return -1;
-
-		offset += digits+1;
-		line += digits+1;
-		len -= digits+1;
-	}
-
-	ex = strlen(expect);
-	if (ex > len)
-		return -1;
-	if (memcmp(line, expect, ex))
-		return -1;
-
-	return offset + ex;
-}
-
-static void recount_diff(const char *line, int size, struct fragment *fragment)
-{
-	int oldlines = 0, newlines = 0, ret = 0;
-
-	if (size < 1) {
-		warning("recount: ignore empty hunk");
-		return;
-	}
-
-	for (;;) {
-		int len = linelen(line, size);
-		size -= len;
-		line += len;
-
-		if (size < 1)
-			break;
-
-		switch (*line) {
-		case ' ': case '\n':
-			newlines++;
-			/* fall through */
-		case '-':
-			oldlines++;
-			continue;
-		case '+':
-			newlines++;
-			continue;
-		case '\\':
-			continue;
-		case '@':
-			ret = size < 3 || !starts_with(line, "@@ ");
-			break;
-		case 'd':
-			ret = size < 5 || !starts_with(line, "diff ");
-			break;
-		default:
-			ret = -1;
-			break;
-		}
-		if (ret) {
-			warning(_("recount: unexpected line: %.*s"),
-				(int)linelen(line, size), line);
-			return;
-		}
-		break;
-	}
-	fragment->oldlines = oldlines;
-	fragment->newlines = newlines;
-}
-
-/*
- * Parse a unified diff fragment header of the
- * form "@@ -a,b +c,d @@"
- */
-static int parse_fragment_header(const char *line, int len, struct fragment *fragment)
-{
-	int offset;
-
-	if (!len || line[len-1] != '\n')
-		return -1;
-
-	/* Figure out the number of lines in a fragment */
-	offset = parse_range(line, len, 4, " +", &fragment->oldpos, &fragment->oldlines);
-	offset = parse_range(line, len, offset, " @@", &fragment->newpos, &fragment->newlines);
-
-	return offset;
-}
-
-static int find_header(struct apply_state *state,
-		       const char *line,
-		       unsigned long size,
-		       int *hdrsize,
-		       struct patch *patch)
-{
-	unsigned long offset, len;
-
-	patch->is_toplevel_relative = 0;
-	patch->is_rename = patch->is_copy = 0;
-	patch->is_new = patch->is_delete = -1;
-	patch->old_mode = patch->new_mode = 0;
-	patch->old_name = patch->new_name = NULL;
-	for (offset = 0; size > 0; offset += len, size -= len, line += len, state->linenr++) {
-		unsigned long nextlen;
-
-		len = linelen(line, size);
-		if (!len)
-			break;
-
-		/* Testing this early allows us to take a few shortcuts.. */
-		if (len < 6)
-			continue;
-
-		/*
-		 * Make sure we don't find any unconnected patch fragments.
-		 * That's a sign that we didn't find a header, and that a
-		 * patch has become corrupted/broken up.
-		 */
-		if (!memcmp("@@ -", line, 4)) {
-			struct fragment dummy;
-			if (parse_fragment_header(line, len, &dummy) < 0)
-				continue;
-			die(_("patch fragment without header at line %d: %.*s"),
-			    state->linenr, (int)len-1, line);
-		}
-
-		if (size < len + 6)
-			break;
-
-		/*
-		 * Git patch? It might not have a real patch, just a rename
-		 * or mode change, so we handle that specially
-		 */
-		if (!memcmp("diff --git ", line, 11)) {
-			int git_hdr_len = parse_git_header(state, line, len, size, patch);
-			if (git_hdr_len <= len)
-				continue;
-			if (!patch->old_name && !patch->new_name) {
-				if (!patch->def_name)
-					die(Q_("git diff header lacks filename information when removing "
-					       "%d leading pathname component (line %d)",
-					       "git diff header lacks filename information when removing "
-					       "%d leading pathname components (line %d)",
-					       state->p_value),
-					    state->p_value, state->linenr);
-				patch->old_name = xstrdup(patch->def_name);
-				patch->new_name = xstrdup(patch->def_name);
-			}
-			if (!patch->is_delete && !patch->new_name)
-				die("git diff header lacks filename information "
-				    "(line %d)", state->linenr);
-			patch->is_toplevel_relative = 1;
-			*hdrsize = git_hdr_len;
-			return offset;
-		}
-
-		/* --- followed by +++ ? */
-		if (memcmp("--- ", line,  4) || memcmp("+++ ", line + len, 4))
-			continue;
-
-		/*
-		 * We only accept unified patches, so we want it to
-		 * at least have "@@ -a,b +c,d @@\n", which is 14 chars
-		 * minimum ("@@ -0,0 +1 @@\n" is the shortest).
-		 */
-		nextlen = linelen(line + len, size - len);
-		if (size < nextlen + 14 || memcmp("@@ -", line + len + nextlen, 4))
-			continue;
-
-		/* Ok, we'll consider it a patch */
-		parse_traditional_patch(state, line, line+len, patch);
-		*hdrsize = len + nextlen;
-		state->linenr += 2;
-		return offset;
-	}
-	return -1;
-}
-
-static void record_ws_error(struct apply_state *state,
-			    unsigned result,
-			    const char *line,
-			    int len,
-			    int linenr)
-{
-	char *err;
-
-	if (!result)
-		return;
-
-	state->whitespace_error++;
-	if (state->squelch_whitespace_errors &&
-	    state->squelch_whitespace_errors < state->whitespace_error)
-		return;
-
-	err = whitespace_error_string(result);
-	fprintf(stderr, "%s:%d: %s.\n%.*s\n",
-		state->patch_input_file, linenr, err, len, line);
-	free(err);
-}
-
-static void check_whitespace(struct apply_state *state,
-			     const char *line,
-			     int len,
-			     unsigned ws_rule)
-{
-	unsigned result = ws_check(line + 1, len - 1, ws_rule);
-
-	record_ws_error(state, result, line + 1, len - 2, state->linenr);
-}
-
-/*
- * Parse a unified diff. Note that this really needs to parse each
- * fragment separately, since the only way to know the difference
- * between a "---" that is part of a patch, and a "---" that starts
- * the next patch is to look at the line counts..
- */
-static int parse_fragment(struct apply_state *state,
-			  const char *line,
-			  unsigned long size,
-			  struct patch *patch,
-			  struct fragment *fragment)
-{
-	int added, deleted;
-	int len = linelen(line, size), offset;
-	unsigned long oldlines, newlines;
-	unsigned long leading, trailing;
-
-	offset = parse_fragment_header(line, len, fragment);
-	if (offset < 0)
-		return -1;
-	if (offset > 0 && patch->recount)
-		recount_diff(line + offset, size - offset, fragment);
-	oldlines = fragment->oldlines;
-	newlines = fragment->newlines;
-	leading = 0;
-	trailing = 0;
-
-	/* Parse the thing.. */
-	line += len;
-	size -= len;
-	state->linenr++;
-	added = deleted = 0;
-	for (offset = len;
-	     0 < size;
-	     offset += len, size -= len, line += len, state->linenr++) {
-		if (!oldlines && !newlines)
-			break;
-		len = linelen(line, size);
-		if (!len || line[len-1] != '\n')
-			return -1;
-		switch (*line) {
-		default:
-			return -1;
-		case '\n': /* newer GNU diff, an empty context line */
-		case ' ':
-			oldlines--;
-			newlines--;
-			if (!deleted && !added)
-				leading++;
-			trailing++;
-			if (!state->apply_in_reverse &&
-			    state->ws_error_action == correct_ws_error)
-				check_whitespace(state, line, len, patch->ws_rule);
-			break;
-		case '-':
-			if (state->apply_in_reverse &&
-			    state->ws_error_action != nowarn_ws_error)
-				check_whitespace(state, line, len, patch->ws_rule);
-			deleted++;
-			oldlines--;
-			trailing = 0;
-			break;
-		case '+':
-			if (!state->apply_in_reverse &&
-			    state->ws_error_action != nowarn_ws_error)
-				check_whitespace(state, line, len, patch->ws_rule);
-			added++;
-			newlines--;
-			trailing = 0;
-			break;
-
-		/*
-		 * We allow "\ No newline at end of file". Depending
-                 * on locale settings when the patch was produced we
-                 * don't know what this line looks like. The only
-                 * thing we do know is that it begins with "\ ".
-		 * Checking for 12 is just for sanity check -- any
-		 * l10n of "\ No newline..." is at least that long.
-		 */
-		case '\\':
-			if (len < 12 || memcmp(line, "\\ ", 2))
-				return -1;
-			break;
-		}
-	}
-	if (oldlines || newlines)
-		return -1;
-	if (!deleted && !added)
-		return -1;
-
-	fragment->leading = leading;
-	fragment->trailing = trailing;
-
-	/*
-	 * If a fragment ends with an incomplete line, we failed to include
-	 * it in the above loop because we hit oldlines == newlines == 0
-	 * before seeing it.
-	 */
-	if (12 < size && !memcmp(line, "\\ ", 2))
-		offset += linelen(line, size);
-
-	patch->lines_added += added;
-	patch->lines_deleted += deleted;
-
-	if (0 < patch->is_new && oldlines)
-		return error(_("new file depends on old contents"));
-	if (0 < patch->is_delete && newlines)
-		return error(_("deleted file still has contents"));
-	return offset;
-}
-
-/*
- * We have seen "diff --git a/... b/..." header (or a traditional patch
- * header).  Read hunks that belong to this patch into fragments and hang
- * them to the given patch structure.
- *
- * The (fragment->patch, fragment->size) pair points into the memory given
- * by the caller, not a copy, when we return.
- */
-static int parse_single_patch(struct apply_state *state,
-			      const char *line,
-			      unsigned long size,
-			      struct patch *patch)
-{
-	unsigned long offset = 0;
-	unsigned long oldlines = 0, newlines = 0, context = 0;
-	struct fragment **fragp = &patch->fragments;
-
-	while (size > 4 && !memcmp(line, "@@ -", 4)) {
-		struct fragment *fragment;
-		int len;
-
-		fragment = xcalloc(1, sizeof(*fragment));
-		fragment->linenr = state->linenr;
-		len = parse_fragment(state, line, size, patch, fragment);
-		if (len <= 0)
-			die(_("corrupt patch at line %d"), state->linenr);
-		fragment->patch = line;
-		fragment->size = len;
-		oldlines += fragment->oldlines;
-		newlines += fragment->newlines;
-		context += fragment->leading + fragment->trailing;
-
-		*fragp = fragment;
-		fragp = &fragment->next;
-
-		offset += len;
-		line += len;
-		size -= len;
-	}
-
-	/*
-	 * If something was removed (i.e. we have old-lines) it cannot
-	 * be creation, and if something was added it cannot be
-	 * deletion.  However, the reverse is not true; --unified=0
-	 * patches that only add are not necessarily creation even
-	 * though they do not have any old lines, and ones that only
-	 * delete are not necessarily deletion.
-	 *
-	 * Unfortunately, a real creation/deletion patch do _not_ have
-	 * any context line by definition, so we cannot safely tell it
-	 * apart with --unified=0 insanity.  At least if the patch has
-	 * more than one hunk it is not creation or deletion.
-	 */
-	if (patch->is_new < 0 &&
-	    (oldlines || (patch->fragments && patch->fragments->next)))
-		patch->is_new = 0;
-	if (patch->is_delete < 0 &&
-	    (newlines || (patch->fragments && patch->fragments->next)))
-		patch->is_delete = 0;
-
-	if (0 < patch->is_new && oldlines)
-		die(_("new file %s depends on old contents"), patch->new_name);
-	if (0 < patch->is_delete && newlines)
-		die(_("deleted file %s still has contents"), patch->old_name);
-	if (!patch->is_delete && !newlines && context)
-		fprintf_ln(stderr,
-			   _("** warning: "
-			     "file %s becomes empty but is not deleted"),
-			   patch->new_name);
-
-	return offset;
-}
-
-static inline int metadata_changes(struct patch *patch)
-{
-	return	patch->is_rename > 0 ||
-		patch->is_copy > 0 ||
-		patch->is_new > 0 ||
-		patch->is_delete ||
-		(patch->old_mode && patch->new_mode &&
-		 patch->old_mode != patch->new_mode);
-}
-
-static char *inflate_it(const void *data, unsigned long size,
-			unsigned long inflated_size)
-{
-	git_zstream stream;
-	void *out;
-	int st;
-
-	memset(&stream, 0, sizeof(stream));
-
-	stream.next_in = (unsigned char *)data;
-	stream.avail_in = size;
-	stream.next_out = out = xmalloc(inflated_size);
-	stream.avail_out = inflated_size;
-	git_inflate_init(&stream);
-	st = git_inflate(&stream, Z_FINISH);
-	git_inflate_end(&stream);
-	if ((st != Z_STREAM_END) || stream.total_out != inflated_size) {
-		free(out);
-		return NULL;
-	}
-	return out;
-}
-
-/*
- * Read a binary hunk and return a new fragment; fragment->patch
- * points at an allocated memory that the caller must free, so
- * it is marked as "->free_patch = 1".
- */
-static struct fragment *parse_binary_hunk(struct apply_state *state,
-					  char **buf_p,
-					  unsigned long *sz_p,
-					  int *status_p,
-					  int *used_p)
-{
-	/*
-	 * Expect a line that begins with binary patch method ("literal"
-	 * or "delta"), followed by the length of data before deflating.
-	 * a sequence of 'length-byte' followed by base-85 encoded data
-	 * should follow, terminated by a newline.
-	 *
-	 * Each 5-byte sequence of base-85 encodes up to 4 bytes,
-	 * and we would limit the patch line to 66 characters,
-	 * so one line can fit up to 13 groups that would decode
-	 * to 52 bytes max.  The length byte 'A'-'Z' corresponds
-	 * to 1-26 bytes, and 'a'-'z' corresponds to 27-52 bytes.
-	 */
-	int llen, used;
-	unsigned long size = *sz_p;
-	char *buffer = *buf_p;
-	int patch_method;
-	unsigned long origlen;
-	char *data = NULL;
-	int hunk_size = 0;
-	struct fragment *frag;
-
-	llen = linelen(buffer, size);
-	used = llen;
-
-	*status_p = 0;
-
-	if (starts_with(buffer, "delta ")) {
-		patch_method = BINARY_DELTA_DEFLATED;
-		origlen = strtoul(buffer + 6, NULL, 10);
-	}
-	else if (starts_with(buffer, "literal ")) {
-		patch_method = BINARY_LITERAL_DEFLATED;
-		origlen = strtoul(buffer + 8, NULL, 10);
-	}
-	else
-		return NULL;
-
-	state->linenr++;
-	buffer += llen;
-	while (1) {
-		int byte_length, max_byte_length, newsize;
-		llen = linelen(buffer, size);
-		used += llen;
-		state->linenr++;
-		if (llen == 1) {
-			/* consume the blank line */
-			buffer++;
-			size--;
-			break;
-		}
-		/*
-		 * Minimum line is "A00000\n" which is 7-byte long,
-		 * and the line length must be multiple of 5 plus 2.
-		 */
-		if ((llen < 7) || (llen-2) % 5)
-			goto corrupt;
-		max_byte_length = (llen - 2) / 5 * 4;
-		byte_length = *buffer;
-		if ('A' <= byte_length && byte_length <= 'Z')
-			byte_length = byte_length - 'A' + 1;
-		else if ('a' <= byte_length && byte_length <= 'z')
-			byte_length = byte_length - 'a' + 27;
-		else
-			goto corrupt;
-		/* if the input length was not multiple of 4, we would
-		 * have filler at the end but the filler should never
-		 * exceed 3 bytes
-		 */
-		if (max_byte_length < byte_length ||
-		    byte_length <= max_byte_length - 4)
-			goto corrupt;
-		newsize = hunk_size + byte_length;
-		data = xrealloc(data, newsize);
-		if (decode_85(data + hunk_size, buffer + 1, byte_length))
-			goto corrupt;
-		hunk_size = newsize;
-		buffer += llen;
-		size -= llen;
-	}
-
-	frag = xcalloc(1, sizeof(*frag));
-	frag->patch = inflate_it(data, hunk_size, origlen);
-	frag->free_patch = 1;
-	if (!frag->patch)
-		goto corrupt;
-	free(data);
-	frag->size = origlen;
-	*buf_p = buffer;
-	*sz_p = size;
-	*used_p = used;
-	frag->binary_patch_method = patch_method;
-	return frag;
-
- corrupt:
-	free(data);
-	*status_p = -1;
-	error(_("corrupt binary patch at line %d: %.*s"),
-	      state->linenr-1, llen-1, buffer);
-	return NULL;
-}
-
-/*
- * Returns:
- *   -1 in case of error,
- *   the length of the parsed binary patch otherwise
- */
-static int parse_binary(struct apply_state *state,
-			char *buffer,
-			unsigned long size,
-			struct patch *patch)
-{
-	/*
-	 * We have read "GIT binary patch\n"; what follows is a line
-	 * that says the patch method (currently, either "literal" or
-	 * "delta") and the length of data before deflating; a
-	 * sequence of 'length-byte' followed by base-85 encoded data
-	 * follows.
-	 *
-	 * When a binary patch is reversible, there is another binary
-	 * hunk in the same format, starting with patch method (either
-	 * "literal" or "delta") with the length of data, and a sequence
-	 * of length-byte + base-85 encoded data, terminated with another
-	 * empty line.  This data, when applied to the postimage, produces
-	 * the preimage.
-	 */
-	struct fragment *forward;
-	struct fragment *reverse;
-	int status;
-	int used, used_1;
-
-	forward = parse_binary_hunk(state, &buffer, &size, &status, &used);
-	if (!forward && !status)
-		/* there has to be one hunk (forward hunk) */
-		return error(_("unrecognized binary patch at line %d"), state->linenr-1);
-	if (status)
-		/* otherwise we already gave an error message */
-		return status;
-
-	reverse = parse_binary_hunk(state, &buffer, &size, &status, &used_1);
-	if (reverse)
-		used += used_1;
-	else if (status) {
-		/*
-		 * Not having reverse hunk is not an error, but having
-		 * a corrupt reverse hunk is.
-		 */
-		free((void*) forward->patch);
-		free(forward);
-		return status;
-	}
-	forward->next = reverse;
-	patch->fragments = forward;
-	patch->is_binary = 1;
-	return used;
-}
-
-static void prefix_one(struct apply_state *state, char **name)
-{
-	char *old_name = *name;
-	if (!old_name)
-		return;
-	*name = xstrdup(prefix_filename(state->prefix, state->prefix_length, *name));
-	free(old_name);
-}
-
-static void prefix_patch(struct apply_state *state, struct patch *p)
-{
-	if (!state->prefix || p->is_toplevel_relative)
-		return;
-	prefix_one(state, &p->new_name);
-	prefix_one(state, &p->old_name);
-}
-
-/*
- * include/exclude
- */
-
-static void add_name_limit(struct apply_state *state,
-			   const char *name,
-			   int exclude)
-{
-	struct string_list_item *it;
-
-	it = string_list_append(&state->limit_by_name, name);
-	it->util = exclude ? NULL : (void *) 1;
-}
-
-static int use_patch(struct apply_state *state, struct patch *p)
-{
-	const char *pathname = p->new_name ? p->new_name : p->old_name;
-	int i;
-
-	/* Paths outside are not touched regardless of "--include" */
-	if (0 < state->prefix_length) {
-		int pathlen = strlen(pathname);
-		if (pathlen <= state->prefix_length ||
-		    memcmp(state->prefix, pathname, state->prefix_length))
-			return 0;
-	}
-
-	/* See if it matches any of exclude/include rule */
-	for (i = 0; i < state->limit_by_name.nr; i++) {
-		struct string_list_item *it = &state->limit_by_name.items[i];
-		if (!wildmatch(it->string, pathname, 0, NULL))
-			return (it->util != NULL);
-	}
-
-	/*
-	 * If we had any include, a path that does not match any rule is
-	 * not used.  Otherwise, we saw bunch of exclude rules (or none)
-	 * and such a path is used.
-	 */
-	return !state->has_include;
-}
-
-
-/*
- * Read the patch text in "buffer" that extends for "size" bytes; stop
- * reading after seeing a single patch (i.e. changes to a single file).
- * Create fragments (i.e. patch hunks) and hang them to the given patch.
- * Return the number of bytes consumed, so that the caller can call us
- * again for the next patch.
- */
-static int parse_chunk(struct apply_state *state, char *buffer, unsigned long size, struct patch *patch)
-{
-	int hdrsize, patchsize;
-	int offset = find_header(state, buffer, size, &hdrsize, patch);
-
-	if (offset < 0)
-		return offset;
-
-	prefix_patch(state, patch);
-
-	if (!use_patch(state, patch))
-		patch->ws_rule = 0;
-	else
-		patch->ws_rule = whitespace_rule(patch->new_name
-						 ? patch->new_name
-						 : patch->old_name);
-
-	patchsize = parse_single_patch(state,
-				       buffer + offset + hdrsize,
-				       size - offset - hdrsize,
-				       patch);
-
-	if (!patchsize) {
-		static const char git_binary[] = "GIT binary patch\n";
-		int hd = hdrsize + offset;
-		unsigned long llen = linelen(buffer + hd, size - hd);
-
-		if (llen == sizeof(git_binary) - 1 &&
-		    !memcmp(git_binary, buffer + hd, llen)) {
-			int used;
-			state->linenr++;
-			used = parse_binary(state, buffer + hd + llen,
-					    size - hd - llen, patch);
-			if (used < 0)
-				return -1;
-			if (used)
-				patchsize = used + llen;
-			else
-				patchsize = 0;
-		}
-		else if (!memcmp(" differ\n", buffer + hd + llen - 8, 8)) {
-			static const char *binhdr[] = {
-				"Binary files ",
-				"Files ",
-				NULL,
-			};
-			int i;
-			for (i = 0; binhdr[i]; i++) {
-				int len = strlen(binhdr[i]);
-				if (len < size - hd &&
-				    !memcmp(binhdr[i], buffer + hd, len)) {
-					state->linenr++;
-					patch->is_binary = 1;
-					patchsize = llen;
-					break;
-				}
-			}
-		}
-
-		/* Empty patch cannot be applied if it is a text patch
-		 * without metadata change.  A binary patch appears
-		 * empty to us here.
-		 */
-		if ((state->apply || state->check) &&
-		    (!patch->is_binary && !metadata_changes(patch)))
-			die(_("patch with only garbage at line %d"), state->linenr);
-	}
-
-	return offset + hdrsize + patchsize;
-}
-
-#define swap(a,b) myswap((a),(b),sizeof(a))
-
-#define myswap(a, b, size) do {		\
-	unsigned char mytmp[size];	\
-	memcpy(mytmp, &a, size);		\
-	memcpy(&a, &b, size);		\
-	memcpy(&b, mytmp, size);		\
-} while (0)
-
-static void reverse_patches(struct patch *p)
-{
-	for (; p; p = p->next) {
-		struct fragment *frag = p->fragments;
-
-		swap(p->new_name, p->old_name);
-		swap(p->new_mode, p->old_mode);
-		swap(p->is_new, p->is_delete);
-		swap(p->lines_added, p->lines_deleted);
-		swap(p->old_sha1_prefix, p->new_sha1_prefix);
-
-		for (; frag; frag = frag->next) {
-			swap(frag->newpos, frag->oldpos);
-			swap(frag->newlines, frag->oldlines);
-		}
-	}
-}
-
-static const char pluses[] =
-"++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++";
-static const char minuses[]=
-"----------------------------------------------------------------------";
-
-static void show_stats(struct apply_state *state, struct patch *patch)
-{
-	struct strbuf qname = STRBUF_INIT;
-	char *cp = patch->new_name ? patch->new_name : patch->old_name;
-	int max, add, del;
-
-	quote_c_style(cp, &qname, NULL, 0);
-
-	/*
-	 * "scale" the filename
-	 */
-	max = state->max_len;
-	if (max > 50)
-		max = 50;
-
-	if (qname.len > max) {
-		cp = strchr(qname.buf + qname.len + 3 - max, '/');
-		if (!cp)
-			cp = qname.buf + qname.len + 3 - max;
-		strbuf_splice(&qname, 0, cp - qname.buf, "...", 3);
-	}
-
-	if (patch->is_binary) {
-		printf(" %-*s |  Bin\n", max, qname.buf);
-		strbuf_release(&qname);
-		return;
-	}
-
-	printf(" %-*s |", max, qname.buf);
-	strbuf_release(&qname);
-
-	/*
-	 * scale the add/delete
-	 */
-	max = max + state->max_change > 70 ? 70 - max : state->max_change;
-	add = patch->lines_added;
-	del = patch->lines_deleted;
-
-	if (state->max_change > 0) {
-		int total = ((add + del) * max + state->max_change / 2) / state->max_change;
-		add = (add * max + state->max_change / 2) / state->max_change;
-		del = total - add;
-	}
-	printf("%5d %.*s%.*s\n", patch->lines_added + patch->lines_deleted,
-		add, pluses, del, minuses);
-}
-
-static int read_old_data(struct stat *st, const char *path, struct strbuf *buf)
-{
-	switch (st->st_mode & S_IFMT) {
-	case S_IFLNK:
-		if (strbuf_readlink(buf, path, st->st_size) < 0)
-			return error(_("unable to read symlink %s"), path);
-		return 0;
-	case S_IFREG:
-		if (strbuf_read_file(buf, path, st->st_size) != st->st_size)
-			return error(_("unable to open or read %s"), path);
-		convert_to_git(path, buf->buf, buf->len, buf, 0);
-		return 0;
-	default:
-		return -1;
-	}
-}
-
-/*
- * Update the preimage, and the common lines in postimage,
- * from buffer buf of length len. If postlen is 0 the postimage
- * is updated in place, otherwise it's updated on a new buffer
- * of length postlen
- */
-
-static void update_pre_post_images(struct image *preimage,
-				   struct image *postimage,
-				   char *buf,
-				   size_t len, size_t postlen)
-{
-	int i, ctx, reduced;
-	char *new, *old, *fixed;
-	struct image fixed_preimage;
-
-	/*
-	 * Update the preimage with whitespace fixes.  Note that we
-	 * are not losing preimage->buf -- apply_one_fragment() will
-	 * free "oldlines".
-	 */
-	prepare_image(&fixed_preimage, buf, len, 1);
-	assert(postlen
-	       ? fixed_preimage.nr == preimage->nr
-	       : fixed_preimage.nr <= preimage->nr);
-	for (i = 0; i < fixed_preimage.nr; i++)
-		fixed_preimage.line[i].flag = preimage->line[i].flag;
-	free(preimage->line_allocated);
-	*preimage = fixed_preimage;
-
-	/*
-	 * Adjust the common context lines in postimage. This can be
-	 * done in-place when we are shrinking it with whitespace
-	 * fixing, but needs a new buffer when ignoring whitespace or
-	 * expanding leading tabs to spaces.
-	 *
-	 * We trust the caller to tell us if the update can be done
-	 * in place (postlen==0) or not.
-	 */
-	old = postimage->buf;
-	if (postlen)
-		new = postimage->buf = xmalloc(postlen);
-	else
-		new = old;
-	fixed = preimage->buf;
-
-	for (i = reduced = ctx = 0; i < postimage->nr; i++) {
-		size_t l_len = postimage->line[i].len;
-		if (!(postimage->line[i].flag & LINE_COMMON)) {
-			/* an added line -- no counterparts in preimage */
-			memmove(new, old, l_len);
-			old += l_len;
-			new += l_len;
-			continue;
-		}
-
-		/* a common context -- skip it in the original postimage */
-		old += l_len;
-
-		/* and find the corresponding one in the fixed preimage */
-		while (ctx < preimage->nr &&
-		       !(preimage->line[ctx].flag & LINE_COMMON)) {
-			fixed += preimage->line[ctx].len;
-			ctx++;
-		}
-
-		/*
-		 * preimage is expected to run out, if the caller
-		 * fixed addition of trailing blank lines.
-		 */
-		if (preimage->nr <= ctx) {
-			reduced++;
-			continue;
-		}
-
-		/* and copy it in, while fixing the line length */
-		l_len = preimage->line[ctx].len;
-		memcpy(new, fixed, l_len);
-		new += l_len;
-		fixed += l_len;
-		postimage->line[i].len = l_len;
-		ctx++;
-	}
-
-	if (postlen
-	    ? postlen < new - postimage->buf
-	    : postimage->len < new - postimage->buf)
-		die("BUG: caller miscounted postlen: asked %d, orig = %d, used = %d",
-		    (int)postlen, (int) postimage->len, (int)(new - postimage->buf));
-
-	/* Fix the length of the whole thing */
-	postimage->len = new - postimage->buf;
-	postimage->nr -= reduced;
-}
-
-static int line_by_line_fuzzy_match(struct image *img,
-				    struct image *preimage,
-				    struct image *postimage,
-				    unsigned long try,
-				    int try_lno,
-				    int preimage_limit)
-{
-	int i;
-	size_t imgoff = 0;
-	size_t preoff = 0;
-	size_t postlen = postimage->len;
-	size_t extra_chars;
-	char *buf;
-	char *preimage_eof;
-	char *preimage_end;
-	struct strbuf fixed;
-	char *fixed_buf;
-	size_t fixed_len;
-
-	for (i = 0; i < preimage_limit; i++) {
-		size_t prelen = preimage->line[i].len;
-		size_t imglen = img->line[try_lno+i].len;
-
-		if (!fuzzy_matchlines(img->buf + try + imgoff, imglen,
-				      preimage->buf + preoff, prelen))
-			return 0;
-		if (preimage->line[i].flag & LINE_COMMON)
-			postlen += imglen - prelen;
-		imgoff += imglen;
-		preoff += prelen;
-	}
-
-	/*
-	 * Ok, the preimage matches with whitespace fuzz.
-	 *
-	 * imgoff now holds the true length of the target that
-	 * matches the preimage before the end of the file.
-	 *
-	 * Count the number of characters in the preimage that fall
-	 * beyond the end of the file and make sure that all of them
-	 * are whitespace characters. (This can only happen if
-	 * we are removing blank lines at the end of the file.)
-	 */
-	buf = preimage_eof = preimage->buf + preoff;
-	for ( ; i < preimage->nr; i++)
-		preoff += preimage->line[i].len;
-	preimage_end = preimage->buf + preoff;
-	for ( ; buf < preimage_end; buf++)
-		if (!isspace(*buf))
-			return 0;
-
-	/*
-	 * Update the preimage and the common postimage context
-	 * lines to use the same whitespace as the target.
-	 * If whitespace is missing in the target (i.e.
-	 * if the preimage extends beyond the end of the file),
-	 * use the whitespace from the preimage.
-	 */
-	extra_chars = preimage_end - preimage_eof;
-	strbuf_init(&fixed, imgoff + extra_chars);
-	strbuf_add(&fixed, img->buf + try, imgoff);
-	strbuf_add(&fixed, preimage_eof, extra_chars);
-	fixed_buf = strbuf_detach(&fixed, &fixed_len);
-	update_pre_post_images(preimage, postimage,
-			       fixed_buf, fixed_len, postlen);
-	return 1;
-}
-
-static int match_fragment(struct apply_state *state,
-			  struct image *img,
-			  struct image *preimage,
-			  struct image *postimage,
-			  unsigned long try,
-			  int try_lno,
-			  unsigned ws_rule,
-			  int match_beginning, int match_end)
-{
-	int i;
-	char *fixed_buf, *buf, *orig, *target;
-	struct strbuf fixed;
-	size_t fixed_len, postlen;
-	int preimage_limit;
-
-	if (preimage->nr + try_lno <= img->nr) {
-		/*
-		 * The hunk falls within the boundaries of img.
-		 */
-		preimage_limit = preimage->nr;
-		if (match_end && (preimage->nr + try_lno != img->nr))
-			return 0;
-	} else if (state->ws_error_action == correct_ws_error &&
-		   (ws_rule & WS_BLANK_AT_EOF)) {
-		/*
-		 * This hunk extends beyond the end of img, and we are
-		 * removing blank lines at the end of the file.  This
-		 * many lines from the beginning of the preimage must
-		 * match with img, and the remainder of the preimage
-		 * must be blank.
-		 */
-		preimage_limit = img->nr - try_lno;
-	} else {
-		/*
-		 * The hunk extends beyond the end of the img and
-		 * we are not removing blanks at the end, so we
-		 * should reject the hunk at this position.
-		 */
-		return 0;
-	}
-
-	if (match_beginning && try_lno)
-		return 0;
-
-	/* Quick hash check */
-	for (i = 0; i < preimage_limit; i++)
-		if ((img->line[try_lno + i].flag & LINE_PATCHED) ||
-		    (preimage->line[i].hash != img->line[try_lno + i].hash))
-			return 0;
-
-	if (preimage_limit == preimage->nr) {
-		/*
-		 * Do we have an exact match?  If we were told to match
-		 * at the end, size must be exactly at try+fragsize,
-		 * otherwise try+fragsize must be still within the preimage,
-		 * and either case, the old piece should match the preimage
-		 * exactly.
-		 */
-		if ((match_end
-		     ? (try + preimage->len == img->len)
-		     : (try + preimage->len <= img->len)) &&
-		    !memcmp(img->buf + try, preimage->buf, preimage->len))
-			return 1;
-	} else {
-		/*
-		 * The preimage extends beyond the end of img, so
-		 * there cannot be an exact match.
-		 *
-		 * There must be one non-blank context line that match
-		 * a line before the end of img.
-		 */
-		char *buf_end;
-
-		buf = preimage->buf;
-		buf_end = buf;
-		for (i = 0; i < preimage_limit; i++)
-			buf_end += preimage->line[i].len;
-
-		for ( ; buf < buf_end; buf++)
-			if (!isspace(*buf))
-				break;
-		if (buf == buf_end)
-			return 0;
-	}
-
-	/*
-	 * No exact match. If we are ignoring whitespace, run a line-by-line
-	 * fuzzy matching. We collect all the line length information because
-	 * we need it to adjust whitespace if we match.
-	 */
-	if (state->ws_ignore_action == ignore_ws_change)
-		return line_by_line_fuzzy_match(img, preimage, postimage,
-						try, try_lno, preimage_limit);
-
-	if (state->ws_error_action != correct_ws_error)
-		return 0;
-
-	/*
-	 * The hunk does not apply byte-by-byte, but the hash says
-	 * it might with whitespace fuzz. We weren't asked to
-	 * ignore whitespace, we were asked to correct whitespace
-	 * errors, so let's try matching after whitespace correction.
-	 *
-	 * While checking the preimage against the target, whitespace
-	 * errors in both fixed, we count how large the corresponding
-	 * postimage needs to be.  The postimage prepared by
-	 * apply_one_fragment() has whitespace errors fixed on added
-	 * lines already, but the common lines were propagated as-is,
-	 * which may become longer when their whitespace errors are
-	 * fixed.
-	 */
-
-	/* First count added lines in postimage */
-	postlen = 0;
-	for (i = 0; i < postimage->nr; i++) {
-		if (!(postimage->line[i].flag & LINE_COMMON))
-			postlen += postimage->line[i].len;
-	}
-
-	/*
-	 * The preimage may extend beyond the end of the file,
-	 * but in this loop we will only handle the part of the
-	 * preimage that falls within the file.
-	 */
-	strbuf_init(&fixed, preimage->len + 1);
-	orig = preimage->buf;
-	target = img->buf + try;
-	for (i = 0; i < preimage_limit; i++) {
-		size_t oldlen = preimage->line[i].len;
-		size_t tgtlen = img->line[try_lno + i].len;
-		size_t fixstart = fixed.len;
-		struct strbuf tgtfix;
-		int match;
-
-		/* Try fixing the line in the preimage */
-		ws_fix_copy(&fixed, orig, oldlen, ws_rule, NULL);
-
-		/* Try fixing the line in the target */
-		strbuf_init(&tgtfix, tgtlen);
-		ws_fix_copy(&tgtfix, target, tgtlen, ws_rule, NULL);
-
-		/*
-		 * If they match, either the preimage was based on
-		 * a version before our tree fixed whitespace breakage,
-		 * or we are lacking a whitespace-fix patch the tree
-		 * the preimage was based on already had (i.e. target
-		 * has whitespace breakage, the preimage doesn't).
-		 * In either case, we are fixing the whitespace breakages
-		 * so we might as well take the fix together with their
-		 * real change.
-		 */
-		match = (tgtfix.len == fixed.len - fixstart &&
-			 !memcmp(tgtfix.buf, fixed.buf + fixstart,
-					     fixed.len - fixstart));
-
-		/* Add the length if this is common with the postimage */
-		if (preimage->line[i].flag & LINE_COMMON)
-			postlen += tgtfix.len;
-
-		strbuf_release(&tgtfix);
-		if (!match)
-			goto unmatch_exit;
-
-		orig += oldlen;
-		target += tgtlen;
-	}
-
-
-	/*
-	 * Now handle the lines in the preimage that falls beyond the
-	 * end of the file (if any). They will only match if they are
-	 * empty or only contain whitespace (if WS_BLANK_AT_EOL is
-	 * false).
-	 */
-	for ( ; i < preimage->nr; i++) {
-		size_t fixstart = fixed.len; /* start of the fixed preimage */
-		size_t oldlen = preimage->line[i].len;
-		int j;
-
-		/* Try fixing the line in the preimage */
-		ws_fix_copy(&fixed, orig, oldlen, ws_rule, NULL);
-
-		for (j = fixstart; j < fixed.len; j++)
-			if (!isspace(fixed.buf[j]))
-				goto unmatch_exit;
-
-		orig += oldlen;
-	}
-
-	/*
-	 * Yes, the preimage is based on an older version that still
-	 * has whitespace breakages unfixed, and fixing them makes the
-	 * hunk match.  Update the context lines in the postimage.
-	 */
-	fixed_buf = strbuf_detach(&fixed, &fixed_len);
-	if (postlen < postimage->len)
-		postlen = 0;
-	update_pre_post_images(preimage, postimage,
-			       fixed_buf, fixed_len, postlen);
-	return 1;
-
- unmatch_exit:
-	strbuf_release(&fixed);
-	return 0;
-}
-
-static int find_pos(struct apply_state *state,
-		    struct image *img,
-		    struct image *preimage,
-		    struct image *postimage,
-		    int line,
-		    unsigned ws_rule,
-		    int match_beginning, int match_end)
-{
-	int i;
-	unsigned long backwards, forwards, try;
-	int backwards_lno, forwards_lno, try_lno;
-
-	/*
-	 * If match_beginning or match_end is specified, there is no
-	 * point starting from a wrong line that will never match and
-	 * wander around and wait for a match at the specified end.
-	 */
-	if (match_beginning)
-		line = 0;
-	else if (match_end)
-		line = img->nr - preimage->nr;
-
-	/*
-	 * Because the comparison is unsigned, the following test
-	 * will also take care of a negative line number that can
-	 * result when match_end and preimage is larger than the target.
-	 */
-	if ((size_t) line > img->nr)
-		line = img->nr;
-
-	try = 0;
-	for (i = 0; i < line; i++)
-		try += img->line[i].len;
-
-	/*
-	 * There's probably some smart way to do this, but I'll leave
-	 * that to the smart and beautiful people. I'm simple and stupid.
-	 */
-	backwards = try;
-	backwards_lno = line;
-	forwards = try;
-	forwards_lno = line;
-	try_lno = line;
-
-	for (i = 0; ; i++) {
-		if (match_fragment(state, img, preimage, postimage,
-				   try, try_lno, ws_rule,
-				   match_beginning, match_end))
-			return try_lno;
-
-	again:
-		if (backwards_lno == 0 && forwards_lno == img->nr)
-			break;
-
-		if (i & 1) {
-			if (backwards_lno == 0) {
-				i++;
-				goto again;
-			}
-			backwards_lno--;
-			backwards -= img->line[backwards_lno].len;
-			try = backwards;
-			try_lno = backwards_lno;
-		} else {
-			if (forwards_lno == img->nr) {
-				i++;
-				goto again;
-			}
-			forwards += img->line[forwards_lno].len;
-			forwards_lno++;
-			try = forwards;
-			try_lno = forwards_lno;
-		}
-
-	}
-	return -1;
-}
-
-static void remove_first_line(struct image *img)
-{
-	img->buf += img->line[0].len;
-	img->len -= img->line[0].len;
-	img->line++;
-	img->nr--;
-}
-
-static void remove_last_line(struct image *img)
-{
-	img->len -= img->line[--img->nr].len;
-}
-
-/*
- * The change from "preimage" and "postimage" has been found to
- * apply at applied_pos (counts in line numbers) in "img".
- * Update "img" to remove "preimage" and replace it with "postimage".
- */
-static void update_image(struct apply_state *state,
-			 struct image *img,
-			 int applied_pos,
-			 struct image *preimage,
-			 struct image *postimage)
-{
-	/*
-	 * remove the copy of preimage at offset in img
-	 * and replace it with postimage
-	 */
-	int i, nr;
-	size_t remove_count, insert_count, applied_at = 0;
-	char *result;
-	int preimage_limit;
-
-	/*
-	 * If we are removing blank lines at the end of img,
-	 * the preimage may extend beyond the end.
-	 * If that is the case, we must be careful only to
-	 * remove the part of the preimage that falls within
-	 * the boundaries of img. Initialize preimage_limit
-	 * to the number of lines in the preimage that falls
-	 * within the boundaries.
-	 */
-	preimage_limit = preimage->nr;
-	if (preimage_limit > img->nr - applied_pos)
-		preimage_limit = img->nr - applied_pos;
-
-	for (i = 0; i < applied_pos; i++)
-		applied_at += img->line[i].len;
-
-	remove_count = 0;
-	for (i = 0; i < preimage_limit; i++)
-		remove_count += img->line[applied_pos + i].len;
-	insert_count = postimage->len;
-
-	/* Adjust the contents */
-	result = xmalloc(st_add3(st_sub(img->len, remove_count), insert_count, 1));
-	memcpy(result, img->buf, applied_at);
-	memcpy(result + applied_at, postimage->buf, postimage->len);
-	memcpy(result + applied_at + postimage->len,
-	       img->buf + (applied_at + remove_count),
-	       img->len - (applied_at + remove_count));
-	free(img->buf);
-	img->buf = result;
-	img->len += insert_count - remove_count;
-	result[img->len] = '\0';
-
-	/* Adjust the line table */
-	nr = img->nr + postimage->nr - preimage_limit;
-	if (preimage_limit < postimage->nr) {
-		/*
-		 * NOTE: this knows that we never call remove_first_line()
-		 * on anything other than pre/post image.
-		 */
-		REALLOC_ARRAY(img->line, nr);
-		img->line_allocated = img->line;
-	}
-	if (preimage_limit != postimage->nr)
-		memmove(img->line + applied_pos + postimage->nr,
-			img->line + applied_pos + preimage_limit,
-			(img->nr - (applied_pos + preimage_limit)) *
-			sizeof(*img->line));
-	memcpy(img->line + applied_pos,
-	       postimage->line,
-	       postimage->nr * sizeof(*img->line));
-	if (!state->allow_overlap)
-		for (i = 0; i < postimage->nr; i++)
-			img->line[applied_pos + i].flag |= LINE_PATCHED;
-	img->nr = nr;
-}
-
-/*
- * Use the patch-hunk text in "frag" to prepare two images (preimage and
- * postimage) for the hunk.  Find lines that match "preimage" in "img" and
- * replace the part of "img" with "postimage" text.
- */
-static int apply_one_fragment(struct apply_state *state,
-			      struct image *img, struct fragment *frag,
-			      int inaccurate_eof, unsigned ws_rule,
-			      int nth_fragment)
-{
-	int match_beginning, match_end;
-	const char *patch = frag->patch;
-	int size = frag->size;
-	char *old, *oldlines;
-	struct strbuf newlines;
-	int new_blank_lines_at_end = 0;
-	int found_new_blank_lines_at_end = 0;
-	int hunk_linenr = frag->linenr;
-	unsigned long leading, trailing;
-	int pos, applied_pos;
-	struct image preimage;
-	struct image postimage;
-
-	memset(&preimage, 0, sizeof(preimage));
-	memset(&postimage, 0, sizeof(postimage));
-	oldlines = xmalloc(size);
-	strbuf_init(&newlines, size);
-
-	old = oldlines;
-	while (size > 0) {
-		char first;
-		int len = linelen(patch, size);
-		int plen;
-		int added_blank_line = 0;
-		int is_blank_context = 0;
-		size_t start;
-
-		if (!len)
-			break;
-
-		/*
-		 * "plen" is how much of the line we should use for
-		 * the actual patch data. Normally we just remove the
-		 * first character on the line, but if the line is
-		 * followed by "\ No newline", then we also remove the
-		 * last one (which is the newline, of course).
-		 */
-		plen = len - 1;
-		if (len < size && patch[len] == '\\')
-			plen--;
-		first = *patch;
-		if (state->apply_in_reverse) {
-			if (first == '-')
-				first = '+';
-			else if (first == '+')
-				first = '-';
-		}
-
-		switch (first) {
-		case '\n':
-			/* Newer GNU diff, empty context line */
-			if (plen < 0)
-				/* ... followed by '\No newline'; nothing */
-				break;
-			*old++ = '\n';
-			strbuf_addch(&newlines, '\n');
-			add_line_info(&preimage, "\n", 1, LINE_COMMON);
-			add_line_info(&postimage, "\n", 1, LINE_COMMON);
-			is_blank_context = 1;
-			break;
-		case ' ':
-			if (plen && (ws_rule & WS_BLANK_AT_EOF) &&
-			    ws_blank_line(patch + 1, plen, ws_rule))
-				is_blank_context = 1;
-		case '-':
-			memcpy(old, patch + 1, plen);
-			add_line_info(&preimage, old, plen,
-				      (first == ' ' ? LINE_COMMON : 0));
-			old += plen;
-			if (first == '-')
-				break;
-		/* Fall-through for ' ' */
-		case '+':
-			/* --no-add does not add new lines */
-			if (first == '+' && state->no_add)
-				break;
-
-			start = newlines.len;
-			if (first != '+' ||
-			    !state->whitespace_error ||
-			    state->ws_error_action != correct_ws_error) {
-				strbuf_add(&newlines, patch + 1, plen);
-			}
-			else {
-				ws_fix_copy(&newlines, patch + 1, plen, ws_rule, &state->applied_after_fixing_ws);
-			}
-			add_line_info(&postimage, newlines.buf + start, newlines.len - start,
-				      (first == '+' ? 0 : LINE_COMMON));
-			if (first == '+' &&
-			    (ws_rule & WS_BLANK_AT_EOF) &&
-			    ws_blank_line(patch + 1, plen, ws_rule))
-				added_blank_line = 1;
-			break;
-		case '@': case '\\':
-			/* Ignore it, we already handled it */
-			break;
-		default:
-			if (state->apply_verbosely)
-				error(_("invalid start of line: '%c'"), first);
-			applied_pos = -1;
-			goto out;
-		}
-		if (added_blank_line) {
-			if (!new_blank_lines_at_end)
-				found_new_blank_lines_at_end = hunk_linenr;
-			new_blank_lines_at_end++;
-		}
-		else if (is_blank_context)
-			;
-		else
-			new_blank_lines_at_end = 0;
-		patch += len;
-		size -= len;
-		hunk_linenr++;
-	}
-	if (inaccurate_eof &&
-	    old > oldlines && old[-1] == '\n' &&
-	    newlines.len > 0 && newlines.buf[newlines.len - 1] == '\n') {
-		old--;
-		strbuf_setlen(&newlines, newlines.len - 1);
-	}
-
-	leading = frag->leading;
-	trailing = frag->trailing;
-
-	/*
-	 * A hunk to change lines at the beginning would begin with
-	 * @@ -1,L +N,M @@
-	 * but we need to be careful.  -U0 that inserts before the second
-	 * line also has this pattern.
-	 *
-	 * And a hunk to add to an empty file would begin with
-	 * @@ -0,0 +N,M @@
-	 *
-	 * In other words, a hunk that is (frag->oldpos <= 1) with or
-	 * without leading context must match at the beginning.
-	 */
-	match_beginning = (!frag->oldpos ||
-			   (frag->oldpos == 1 && !state->unidiff_zero));
-
-	/*
-	 * A hunk without trailing lines must match at the end.
-	 * However, we simply cannot tell if a hunk must match end
-	 * from the lack of trailing lines if the patch was generated
-	 * with unidiff without any context.
-	 */
-	match_end = !state->unidiff_zero && !trailing;
-
-	pos = frag->newpos ? (frag->newpos - 1) : 0;
-	preimage.buf = oldlines;
-	preimage.len = old - oldlines;
-	postimage.buf = newlines.buf;
-	postimage.len = newlines.len;
-	preimage.line = preimage.line_allocated;
-	postimage.line = postimage.line_allocated;
-
-	for (;;) {
-
-		applied_pos = find_pos(state, img, &preimage, &postimage, pos,
-				       ws_rule, match_beginning, match_end);
-
-		if (applied_pos >= 0)
-			break;
-
-		/* Am I at my context limits? */
-		if ((leading <= state->p_context) && (trailing <= state->p_context))
-			break;
-		if (match_beginning || match_end) {
-			match_beginning = match_end = 0;
-			continue;
-		}
-
-		/*
-		 * Reduce the number of context lines; reduce both
-		 * leading and trailing if they are equal otherwise
-		 * just reduce the larger context.
-		 */
-		if (leading >= trailing) {
-			remove_first_line(&preimage);
-			remove_first_line(&postimage);
-			pos--;
-			leading--;
-		}
-		if (trailing > leading) {
-			remove_last_line(&preimage);
-			remove_last_line(&postimage);
-			trailing--;
-		}
-	}
-
-	if (applied_pos >= 0) {
-		if (new_blank_lines_at_end &&
-		    preimage.nr + applied_pos >= img->nr &&
-		    (ws_rule & WS_BLANK_AT_EOF) &&
-		    state->ws_error_action != nowarn_ws_error) {
-			record_ws_error(state, WS_BLANK_AT_EOF, "+", 1,
-					found_new_blank_lines_at_end);
-			if (state->ws_error_action == correct_ws_error) {
-				while (new_blank_lines_at_end--)
-					remove_last_line(&postimage);
-			}
-			/*
-			 * We would want to prevent write_out_results()
-			 * from taking place in apply_patch() that follows
-			 * the callchain led us here, which is:
-			 * apply_patch->check_patch_list->check_patch->
-			 * apply_data->apply_fragments->apply_one_fragment
-			 */
-			if (state->ws_error_action == die_on_ws_error)
-				state->apply = 0;
-		}
-
-		if (state->apply_verbosely && applied_pos != pos) {
-			int offset = applied_pos - pos;
-			if (state->apply_in_reverse)
-				offset = 0 - offset;
-			fprintf_ln(stderr,
-				   Q_("Hunk #%d succeeded at %d (offset %d line).",
-				      "Hunk #%d succeeded at %d (offset %d lines).",
-				      offset),
-				   nth_fragment, applied_pos + 1, offset);
-		}
-
-		/*
-		 * Warn if it was necessary to reduce the number
-		 * of context lines.
-		 */
-		if ((leading != frag->leading) ||
-		    (trailing != frag->trailing))
-			fprintf_ln(stderr, _("Context reduced to (%ld/%ld)"
-					     " to apply fragment at %d"),
-				   leading, trailing, applied_pos+1);
-		update_image(state, img, applied_pos, &preimage, &postimage);
-	} else {
-		if (state->apply_verbosely)
-			error(_("while searching for:\n%.*s"),
-			      (int)(old - oldlines), oldlines);
-	}
-
-out:
-	free(oldlines);
-	strbuf_release(&newlines);
-	free(preimage.line_allocated);
-	free(postimage.line_allocated);
-
-	return (applied_pos < 0);
-}
-
-static int apply_binary_fragment(struct apply_state *state,
-				 struct image *img,
-				 struct patch *patch)
-{
-	struct fragment *fragment = patch->fragments;
-	unsigned long len;
-	void *dst;
-
-	if (!fragment)
-		return error(_("missing binary patch data for '%s'"),
-			     patch->new_name ?
-			     patch->new_name :
-			     patch->old_name);
-
-	/* Binary patch is irreversible without the optional second hunk */
-	if (state->apply_in_reverse) {
-		if (!fragment->next)
-			return error("cannot reverse-apply a binary patch "
-				     "without the reverse hunk to '%s'",
-				     patch->new_name
-				     ? patch->new_name : patch->old_name);
-		fragment = fragment->next;
-	}
-	switch (fragment->binary_patch_method) {
-	case BINARY_DELTA_DEFLATED:
-		dst = patch_delta(img->buf, img->len, fragment->patch,
-				  fragment->size, &len);
-		if (!dst)
-			return -1;
-		clear_image(img);
-		img->buf = dst;
-		img->len = len;
-		return 0;
-	case BINARY_LITERAL_DEFLATED:
-		clear_image(img);
-		img->len = fragment->size;
-		img->buf = xmemdupz(fragment->patch, img->len);
-		return 0;
-	}
-	return -1;
-}
-
-/*
- * Replace "img" with the result of applying the binary patch.
- * The binary patch data itself in patch->fragment is still kept
- * but the preimage prepared by the caller in "img" is freed here
- * or in the helper function apply_binary_fragment() this calls.
- */
-static int apply_binary(struct apply_state *state,
-			struct image *img,
-			struct patch *patch)
-{
-	const char *name = patch->old_name ? patch->old_name : patch->new_name;
-	unsigned char sha1[20];
-
-	/*
-	 * For safety, we require patch index line to contain
-	 * full 40-byte textual SHA1 for old and new, at least for now.
-	 */
-	if (strlen(patch->old_sha1_prefix) != 40 ||
-	    strlen(patch->new_sha1_prefix) != 40 ||
-	    get_sha1_hex(patch->old_sha1_prefix, sha1) ||
-	    get_sha1_hex(patch->new_sha1_prefix, sha1))
-		return error("cannot apply binary patch to '%s' "
-			     "without full index line", name);
-
-	if (patch->old_name) {
-		/*
-		 * See if the old one matches what the patch
-		 * applies to.
-		 */
-		hash_sha1_file(img->buf, img->len, blob_type, sha1);
-		if (strcmp(sha1_to_hex(sha1), patch->old_sha1_prefix))
-			return error("the patch applies to '%s' (%s), "
-				     "which does not match the "
-				     "current contents.",
-				     name, sha1_to_hex(sha1));
-	}
-	else {
-		/* Otherwise, the old one must be empty. */
-		if (img->len)
-			return error("the patch applies to an empty "
-				     "'%s' but it is not empty", name);
-	}
-
-	get_sha1_hex(patch->new_sha1_prefix, sha1);
-	if (is_null_sha1(sha1)) {
-		clear_image(img);
-		return 0; /* deletion patch */
-	}
-
-	if (has_sha1_file(sha1)) {
-		/* We already have the postimage */
-		enum object_type type;
-		unsigned long size;
-		char *result;
-
-		result = read_sha1_file(sha1, &type, &size);
-		if (!result)
-			return error("the necessary postimage %s for "
-				     "'%s' cannot be read",
-				     patch->new_sha1_prefix, name);
-		clear_image(img);
-		img->buf = result;
-		img->len = size;
-	} else {
-		/*
-		 * We have verified buf matches the preimage;
-		 * apply the patch data to it, which is stored
-		 * in the patch->fragments->{patch,size}.
-		 */
-		if (apply_binary_fragment(state, img, patch))
-			return error(_("binary patch does not apply to '%s'"),
-				     name);
-
-		/* verify that the result matches */
-		hash_sha1_file(img->buf, img->len, blob_type, sha1);
-		if (strcmp(sha1_to_hex(sha1), patch->new_sha1_prefix))
-			return error(_("binary patch to '%s' creates incorrect result (expecting %s, got %s)"),
-				name, patch->new_sha1_prefix, sha1_to_hex(sha1));
-	}
-
-	return 0;
-}
-
-static int apply_fragments(struct apply_state *state, struct image *img, struct patch *patch)
-{
-	struct fragment *frag = patch->fragments;
-	const char *name = patch->old_name ? patch->old_name : patch->new_name;
-	unsigned ws_rule = patch->ws_rule;
-	unsigned inaccurate_eof = patch->inaccurate_eof;
-	int nth = 0;
-
-	if (patch->is_binary)
-		return apply_binary(state, img, patch);
-
-	while (frag) {
-		nth++;
-		if (apply_one_fragment(state, img, frag, inaccurate_eof, ws_rule, nth)) {
-			error(_("patch failed: %s:%ld"), name, frag->oldpos);
-			if (!state->apply_with_reject)
-				return -1;
-			frag->rejected = 1;
-		}
-		frag = frag->next;
-	}
-	return 0;
-}
-
-static int read_blob_object(struct strbuf *buf, const unsigned char *sha1, unsigned mode)
-{
-	if (S_ISGITLINK(mode)) {
-		strbuf_grow(buf, 100);
-		strbuf_addf(buf, "Subproject commit %s\n", sha1_to_hex(sha1));
-	} else {
-		enum object_type type;
-		unsigned long sz;
-		char *result;
-
-		result = read_sha1_file(sha1, &type, &sz);
-		if (!result)
-			return -1;
-		/* XXX read_sha1_file NUL-terminates */
-		strbuf_attach(buf, result, sz, sz + 1);
-	}
-	return 0;
-}
-
-static int read_file_or_gitlink(const struct cache_entry *ce, struct strbuf *buf)
-{
-	if (!ce)
-		return 0;
-	return read_blob_object(buf, ce->sha1, ce->ce_mode);
-}
-
-static struct patch *in_fn_table(struct apply_state *state, const char *name)
-{
-	struct string_list_item *item;
-
-	if (name == NULL)
-		return NULL;
-
-	item = string_list_lookup(&state->fn_table, name);
-	if (item != NULL)
-		return (struct patch *)item->util;
-
-	return NULL;
-}
-
-/*
- * item->util in the filename table records the status of the path.
- * Usually it points at a patch (whose result records the contents
- * of it after applying it), but it could be PATH_WAS_DELETED for a
- * path that a previously applied patch has already removed, or
- * PATH_TO_BE_DELETED for a path that a later patch would remove.
- *
- * The latter is needed to deal with a case where two paths A and B
- * are swapped by first renaming A to B and then renaming B to A;
- * moving A to B should not be prevented due to presence of B as we
- * will remove it in a later patch.
- */
-#define PATH_TO_BE_DELETED ((struct patch *) -2)
-#define PATH_WAS_DELETED ((struct patch *) -1)
-
-static int to_be_deleted(struct patch *patch)
-{
-	return patch == PATH_TO_BE_DELETED;
-}
-
-static int was_deleted(struct patch *patch)
-{
-	return patch == PATH_WAS_DELETED;
-}
-
-static void add_to_fn_table(struct apply_state *state, struct patch *patch)
-{
-	struct string_list_item *item;
-
-	/*
-	 * Always add new_name unless patch is a deletion
-	 * This should cover the cases for normal diffs,
-	 * file creations and copies
-	 */
-	if (patch->new_name != NULL) {
-		item = string_list_insert(&state->fn_table, patch->new_name);
-		item->util = patch;
-	}
-
-	/*
-	 * store a failure on rename/deletion cases because
-	 * later chunks shouldn't patch old names
-	 */
-	if ((patch->new_name == NULL) || (patch->is_rename)) {
-		item = string_list_insert(&state->fn_table, patch->old_name);
-		item->util = PATH_WAS_DELETED;
-	}
-}
-
-static void prepare_fn_table(struct apply_state *state, struct patch *patch)
-{
-	/*
-	 * store information about incoming file deletion
-	 */
-	while (patch) {
-		if ((patch->new_name == NULL) || (patch->is_rename)) {
-			struct string_list_item *item;
-			item = string_list_insert(&state->fn_table, patch->old_name);
-			item->util = PATH_TO_BE_DELETED;
-		}
-		patch = patch->next;
-	}
-}
-
-static int checkout_target(struct index_state *istate,
-			   struct cache_entry *ce, struct stat *st)
-{
-	struct checkout costate;
-
-	memset(&costate, 0, sizeof(costate));
-	costate.base_dir = "";
-	costate.refresh_cache = 1;
-	costate.istate = istate;
-	if (checkout_entry(ce, &costate, NULL) || lstat(ce->name, st))
-		return error(_("cannot checkout %s"), ce->name);
-	return 0;
-}
-
-static struct patch *previous_patch(struct apply_state *state,
-				    struct patch *patch,
-				    int *gone)
-{
-	struct patch *previous;
-
-	*gone = 0;
-	if (patch->is_copy || patch->is_rename)
-		return NULL; /* "git" patches do not depend on the order */
-
-	previous = in_fn_table(state, patch->old_name);
-	if (!previous)
-		return NULL;
-
-	if (to_be_deleted(previous))
-		return NULL; /* the deletion hasn't happened yet */
-
-	if (was_deleted(previous))
-		*gone = 1;
-
-	return previous;
-}
-
-static int verify_index_match(const struct cache_entry *ce, struct stat *st)
-{
-	if (S_ISGITLINK(ce->ce_mode)) {
-		if (!S_ISDIR(st->st_mode))
-			return -1;
-		return 0;
-	}
-	return ce_match_stat(ce, st, CE_MATCH_IGNORE_VALID|CE_MATCH_IGNORE_SKIP_WORKTREE);
-}
-
-#define SUBMODULE_PATCH_WITHOUT_INDEX 1
-
-static int load_patch_target(struct apply_state *state,
-			     struct strbuf *buf,
-			     const struct cache_entry *ce,
-			     struct stat *st,
-			     const char *name,
-			     unsigned expected_mode)
-{
-	if (state->cached || state->check_index) {
-		if (read_file_or_gitlink(ce, buf))
-			return error(_("failed to read %s"), name);
-	} else if (name) {
-		if (S_ISGITLINK(expected_mode)) {
-			if (ce)
-				return read_file_or_gitlink(ce, buf);
-			else
-				return SUBMODULE_PATCH_WITHOUT_INDEX;
-		} else if (has_symlink_leading_path(name, strlen(name))) {
-			return error(_("reading from '%s' beyond a symbolic link"), name);
-		} else {
-			if (read_old_data(st, name, buf))
-				return error(_("failed to read %s"), name);
-		}
-	}
-	return 0;
-}
-
-/*
- * We are about to apply "patch"; populate the "image" with the
- * current version we have, from the working tree or from the index,
- * depending on the situation e.g. --cached/--index.  If we are
- * applying a non-git patch that incrementally updates the tree,
- * we read from the result of a previous diff.
- */
-static int load_preimage(struct apply_state *state,
-			 struct image *image,
-			 struct patch *patch, struct stat *st,
-			 const struct cache_entry *ce)
-{
-	struct strbuf buf = STRBUF_INIT;
-	size_t len;
-	char *img;
-	struct patch *previous;
-	int status;
-
-	previous = previous_patch(state, patch, &status);
-	if (status)
-		return error(_("path %s has been renamed/deleted"),
-			     patch->old_name);
-	if (previous) {
-		/* We have a patched copy in memory; use that. */
-		strbuf_add(&buf, previous->result, previous->resultsize);
-	} else {
-		status = load_patch_target(state, &buf, ce, st,
-					   patch->old_name, patch->old_mode);
-		if (status < 0)
-			return status;
-		else if (status == SUBMODULE_PATCH_WITHOUT_INDEX) {
-			/*
-			 * There is no way to apply subproject
-			 * patch without looking at the index.
-			 * NEEDSWORK: shouldn't this be flagged
-			 * as an error???
-			 */
-			free_fragment_list(patch->fragments);
-			patch->fragments = NULL;
-		} else if (status) {
-			return error(_("failed to read %s"), patch->old_name);
-		}
-	}
-
-	img = strbuf_detach(&buf, &len);
-	prepare_image(image, img, len, !patch->is_binary);
-	return 0;
-}
-
-static int three_way_merge(struct image *image,
-			   char *path,
-			   const unsigned char *base,
-			   const unsigned char *ours,
-			   const unsigned char *theirs)
-{
-	mmfile_t base_file, our_file, their_file;
-	mmbuffer_t result = { NULL };
-	int status;
-
-	read_mmblob(&base_file, base);
-	read_mmblob(&our_file, ours);
-	read_mmblob(&their_file, theirs);
-	status = ll_merge(&result, path,
-			  &base_file, "base",
-			  &our_file, "ours",
-			  &their_file, "theirs", NULL);
-	free(base_file.ptr);
-	free(our_file.ptr);
-	free(their_file.ptr);
-	if (status < 0 || !result.ptr) {
-		free(result.ptr);
-		return -1;
-	}
-	clear_image(image);
-	image->buf = result.ptr;
-	image->len = result.size;
-
-	return status;
-}
-
-/*
- * When directly falling back to add/add three-way merge, we read from
- * the current contents of the new_name.  In no cases other than that
- * this function will be called.
- */
-static int load_current(struct apply_state *state,
-			struct image *image,
-			struct patch *patch)
-{
-	struct strbuf buf = STRBUF_INIT;
-	int status, pos;
-	size_t len;
-	char *img;
-	struct stat st;
-	struct cache_entry *ce;
-	char *name = patch->new_name;
-	unsigned mode = patch->new_mode;
-
-	if (!patch->is_new)
-		die("BUG: patch to %s is not a creation", patch->old_name);
-
-	pos = cache_name_pos(name, strlen(name));
-	if (pos < 0)
-		return error(_("%s: does not exist in index"), name);
-	ce = active_cache[pos];
-	if (lstat(name, &st)) {
-		if (errno != ENOENT)
-			return error(_("%s: %s"), name, strerror(errno));
-		if (checkout_target(&the_index, ce, &st))
-			return -1;
-	}
-	if (verify_index_match(ce, &st))
-		return error(_("%s: does not match index"), name);
-
-	status = load_patch_target(state, &buf, ce, &st, name, mode);
-	if (status < 0)
-		return status;
-	else if (status)
-		return -1;
-	img = strbuf_detach(&buf, &len);
-	prepare_image(image, img, len, !patch->is_binary);
-	return 0;
-}
-
-static int try_threeway(struct apply_state *state,
-			struct image *image,
-			struct patch *patch,
-			struct stat *st,
-			const struct cache_entry *ce)
-{
-	unsigned char pre_sha1[20], post_sha1[20], our_sha1[20];
-	struct strbuf buf = STRBUF_INIT;
-	size_t len;
-	int status;
-	char *img;
-	struct image tmp_image;
-
-	/* No point falling back to 3-way merge in these cases */
-	if (patch->is_delete ||
-	    S_ISGITLINK(patch->old_mode) || S_ISGITLINK(patch->new_mode))
-		return -1;
-
-	/* Preimage the patch was prepared for */
-	if (patch->is_new)
-		write_sha1_file("", 0, blob_type, pre_sha1);
-	else if (get_sha1(patch->old_sha1_prefix, pre_sha1) ||
-		 read_blob_object(&buf, pre_sha1, patch->old_mode))
-		return error("repository lacks the necessary blob to fall back on 3-way merge.");
-
-	fprintf(stderr, "Falling back to three-way merge...\n");
-
-	img = strbuf_detach(&buf, &len);
-	prepare_image(&tmp_image, img, len, 1);
-	/* Apply the patch to get the post image */
-	if (apply_fragments(state, &tmp_image, patch) < 0) {
-		clear_image(&tmp_image);
-		return -1;
-	}
-	/* post_sha1[] is theirs */
-	write_sha1_file(tmp_image.buf, tmp_image.len, blob_type, post_sha1);
-	clear_image(&tmp_image);
-
-	/* our_sha1[] is ours */
-	if (patch->is_new) {
-		if (load_current(state, &tmp_image, patch))
-			return error("cannot read the current contents of '%s'",
-				     patch->new_name);
-	} else {
-		if (load_preimage(state, &tmp_image, patch, st, ce))
-			return error("cannot read the current contents of '%s'",
-				     patch->old_name);
-	}
-	write_sha1_file(tmp_image.buf, tmp_image.len, blob_type, our_sha1);
-	clear_image(&tmp_image);
-
-	/* in-core three-way merge between post and our using pre as base */
-	status = three_way_merge(image, patch->new_name,
-				 pre_sha1, our_sha1, post_sha1);
-	if (status < 0) {
-		fprintf(stderr, "Failed to fall back on three-way merge...\n");
-		return status;
-	}
-
-	if (status) {
-		patch->conflicted_threeway = 1;
-		if (patch->is_new)
-			oidclr(&patch->threeway_stage[0]);
-		else
-			hashcpy(patch->threeway_stage[0].hash, pre_sha1);
-		hashcpy(patch->threeway_stage[1].hash, our_sha1);
-		hashcpy(patch->threeway_stage[2].hash, post_sha1);
-		fprintf(stderr, "Applied patch to '%s' with conflicts.\n", patch->new_name);
-	} else {
-		fprintf(stderr, "Applied patch to '%s' cleanly.\n", patch->new_name);
-	}
-	return 0;
-}
-
-static int apply_data(struct apply_state *state, struct patch *patch,
-		      struct stat *st, const struct cache_entry *ce)
-{
-	struct image image;
-
-	if (load_preimage(state, &image, patch, st, ce) < 0)
-		return -1;
-
-	if (patch->direct_to_threeway ||
-	    apply_fragments(state, &image, patch) < 0) {
-		/* Note: with --reject, apply_fragments() returns 0 */
-		if (!state->threeway || try_threeway(state, &image, patch, st, ce) < 0)
-			return -1;
-	}
-	patch->result = image.buf;
-	patch->resultsize = image.len;
-	add_to_fn_table(state, patch);
-	free(image.line_allocated);
-
-	if (0 < patch->is_delete && patch->resultsize)
-		return error(_("removal patch leaves file contents"));
-
-	return 0;
-}
-
-/*
- * If "patch" that we are looking at modifies or deletes what we have,
- * we would want it not to lose any local modification we have, either
- * in the working tree or in the index.
- *
- * This also decides if a non-git patch is a creation patch or a
- * modification to an existing empty file.  We do not check the state
- * of the current tree for a creation patch in this function; the caller
- * check_patch() separately makes sure (and errors out otherwise) that
- * the path the patch creates does not exist in the current tree.
- */
-static int check_preimage(struct apply_state *state,
-			  struct patch *patch,
-			  struct cache_entry **ce,
-			  struct stat *st)
-{
-	const char *old_name = patch->old_name;
-	struct patch *previous = NULL;
-	int stat_ret = 0, status;
-	unsigned st_mode = 0;
-
-	if (!old_name)
-		return 0;
-
-	assert(patch->is_new <= 0);
-	previous = previous_patch(state, patch, &status);
-
-	if (status)
-		return error(_("path %s has been renamed/deleted"), old_name);
-	if (previous) {
-		st_mode = previous->new_mode;
-	} else if (!state->cached) {
-		stat_ret = lstat(old_name, st);
-		if (stat_ret && errno != ENOENT)
-			return error(_("%s: %s"), old_name, strerror(errno));
-	}
-
-	if (state->check_index && !previous) {
-		int pos = cache_name_pos(old_name, strlen(old_name));
-		if (pos < 0) {
-			if (patch->is_new < 0)
-				goto is_new;
-			return error(_("%s: does not exist in index"), old_name);
-		}
-		*ce = active_cache[pos];
-		if (stat_ret < 0) {
-			if (checkout_target(&the_index, *ce, st))
-				return -1;
-		}
-		if (!state->cached && verify_index_match(*ce, st))
-			return error(_("%s: does not match index"), old_name);
-		if (state->cached)
-			st_mode = (*ce)->ce_mode;
-	} else if (stat_ret < 0) {
-		if (patch->is_new < 0)
-			goto is_new;
-		return error(_("%s: %s"), old_name, strerror(errno));
-	}
-
-	if (!state->cached && !previous)
-		st_mode = ce_mode_from_stat(*ce, st->st_mode);
-
-	if (patch->is_new < 0)
-		patch->is_new = 0;
-	if (!patch->old_mode)
-		patch->old_mode = st_mode;
-	if ((st_mode ^ patch->old_mode) & S_IFMT)
-		return error(_("%s: wrong type"), old_name);
-	if (st_mode != patch->old_mode)
-		warning(_("%s has type %o, expected %o"),
-			old_name, st_mode, patch->old_mode);
-	if (!patch->new_mode && !patch->is_delete)
-		patch->new_mode = st_mode;
-	return 0;
-
- is_new:
-	patch->is_new = 1;
-	patch->is_delete = 0;
-	free(patch->old_name);
-	patch->old_name = NULL;
-	return 0;
-}
-
-
-#define EXISTS_IN_INDEX 1
-#define EXISTS_IN_WORKTREE 2
-
-static int check_to_create(struct apply_state *state,
-			   const char *new_name,
-			   int ok_if_exists)
-{
-	struct stat nst;
-
-	if (state->check_index &&
-	    cache_name_pos(new_name, strlen(new_name)) >= 0 &&
-	    !ok_if_exists)
-		return EXISTS_IN_INDEX;
-	if (state->cached)
-		return 0;
-
-	if (!lstat(new_name, &nst)) {
-		if (S_ISDIR(nst.st_mode) || ok_if_exists)
-			return 0;
-		/*
-		 * A leading component of new_name might be a symlink
-		 * that is going to be removed with this patch, but
-		 * still pointing at somewhere that has the path.
-		 * In such a case, path "new_name" does not exist as
-		 * far as git is concerned.
-		 */
-		if (has_symlink_leading_path(new_name, strlen(new_name)))
-			return 0;
-
-		return EXISTS_IN_WORKTREE;
-	} else if ((errno != ENOENT) && (errno != ENOTDIR)) {
-		return error("%s: %s", new_name, strerror(errno));
-	}
-	return 0;
-}
-
-static uintptr_t register_symlink_changes(struct apply_state *state,
-					  const char *path,
-					  uintptr_t what)
-{
-	struct string_list_item *ent;
-
-	ent = string_list_lookup(&state->symlink_changes, path);
-	if (!ent) {
-		ent = string_list_insert(&state->symlink_changes, path);
-		ent->util = (void *)0;
-	}
-	ent->util = (void *)(what | ((uintptr_t)ent->util));
-	return (uintptr_t)ent->util;
-}
-
-static uintptr_t check_symlink_changes(struct apply_state *state, const char *path)
-{
-	struct string_list_item *ent;
-
-	ent = string_list_lookup(&state->symlink_changes, path);
-	if (!ent)
-		return 0;
-	return (uintptr_t)ent->util;
-}
-
-static void prepare_symlink_changes(struct apply_state *state, struct patch *patch)
-{
-	for ( ; patch; patch = patch->next) {
-		if ((patch->old_name && S_ISLNK(patch->old_mode)) &&
-		    (patch->is_rename || patch->is_delete))
-			/* the symlink at patch->old_name is removed */
-			register_symlink_changes(state, patch->old_name, SYMLINK_GOES_AWAY);
-
-		if (patch->new_name && S_ISLNK(patch->new_mode))
-			/* the symlink at patch->new_name is created or remains */
-			register_symlink_changes(state, patch->new_name, SYMLINK_IN_RESULT);
-	}
-}
-
-static int path_is_beyond_symlink_1(struct apply_state *state, struct strbuf *name)
-{
-	do {
-		unsigned int change;
-
-		while (--name->len && name->buf[name->len] != '/')
-			; /* scan backwards */
-		if (!name->len)
-			break;
-		name->buf[name->len] = '\0';
-		change = check_symlink_changes(state, name->buf);
-		if (change & SYMLINK_IN_RESULT)
-			return 1;
-		if (change & SYMLINK_GOES_AWAY)
-			/*
-			 * This cannot be "return 0", because we may
-			 * see a new one created at a higher level.
-			 */
-			continue;
-
-		/* otherwise, check the preimage */
-		if (state->check_index) {
-			struct cache_entry *ce;
-
-			ce = cache_file_exists(name->buf, name->len, ignore_case);
-			if (ce && S_ISLNK(ce->ce_mode))
-				return 1;
-		} else {
-			struct stat st;
-			if (!lstat(name->buf, &st) && S_ISLNK(st.st_mode))
-				return 1;
-		}
-	} while (1);
-	return 0;
-}
-
-static int path_is_beyond_symlink(struct apply_state *state, const char *name_)
-{
-	int ret;
-	struct strbuf name = STRBUF_INIT;
-
-	assert(*name_ != '\0');
-	strbuf_addstr(&name, name_);
-	ret = path_is_beyond_symlink_1(state, &name);
-	strbuf_release(&name);
-
-	return ret;
-}
-
-static void die_on_unsafe_path(struct patch *patch)
-{
-	const char *old_name = NULL;
-	const char *new_name = NULL;
-	if (patch->is_delete)
-		old_name = patch->old_name;
-	else if (!patch->is_new && !patch->is_copy)
-		old_name = patch->old_name;
-	if (!patch->is_delete)
-		new_name = patch->new_name;
-
-	if (old_name && !verify_path(old_name))
-		die(_("invalid path '%s'"), old_name);
-	if (new_name && !verify_path(new_name))
-		die(_("invalid path '%s'"), new_name);
-}
-
-/*
- * Check and apply the patch in-core; leave the result in patch->result
- * for the caller to write it out to the final destination.
- */
-static int check_patch(struct apply_state *state, struct patch *patch)
-{
-	struct stat st;
-	const char *old_name = patch->old_name;
-	const char *new_name = patch->new_name;
-	const char *name = old_name ? old_name : new_name;
-	struct cache_entry *ce = NULL;
-	struct patch *tpatch;
-	int ok_if_exists;
-	int status;
-
-	patch->rejected = 1; /* we will drop this after we succeed */
-
-	status = check_preimage(state, patch, &ce, &st);
-	if (status)
-		return status;
-	old_name = patch->old_name;
-
-	/*
-	 * A type-change diff is always split into a patch to delete
-	 * old, immediately followed by a patch to create new (see
-	 * diff.c::run_diff()); in such a case it is Ok that the entry
-	 * to be deleted by the previous patch is still in the working
-	 * tree and in the index.
-	 *
-	 * A patch to swap-rename between A and B would first rename A
-	 * to B and then rename B to A.  While applying the first one,
-	 * the presence of B should not stop A from getting renamed to
-	 * B; ask to_be_deleted() about the later rename.  Removal of
-	 * B and rename from A to B is handled the same way by asking
-	 * was_deleted().
-	 */
-	if ((tpatch = in_fn_table(state, new_name)) &&
-	    (was_deleted(tpatch) || to_be_deleted(tpatch)))
-		ok_if_exists = 1;
-	else
-		ok_if_exists = 0;
-
-	if (new_name &&
-	    ((0 < patch->is_new) || patch->is_rename || patch->is_copy)) {
-		int err = check_to_create(state, new_name, ok_if_exists);
-
-		if (err && state->threeway) {
-			patch->direct_to_threeway = 1;
-		} else switch (err) {
-		case 0:
-			break; /* happy */
-		case EXISTS_IN_INDEX:
-			return error(_("%s: already exists in index"), new_name);
-			break;
-		case EXISTS_IN_WORKTREE:
-			return error(_("%s: already exists in working directory"),
-				     new_name);
-		default:
-			return err;
-		}
-
-		if (!patch->new_mode) {
-			if (0 < patch->is_new)
-				patch->new_mode = S_IFREG | 0644;
-			else
-				patch->new_mode = patch->old_mode;
-		}
-	}
-
-	if (new_name && old_name) {
-		int same = !strcmp(old_name, new_name);
-		if (!patch->new_mode)
-			patch->new_mode = patch->old_mode;
-		if ((patch->old_mode ^ patch->new_mode) & S_IFMT) {
-			if (same)
-				return error(_("new mode (%o) of %s does not "
-					       "match old mode (%o)"),
-					patch->new_mode, new_name,
-					patch->old_mode);
-			else
-				return error(_("new mode (%o) of %s does not "
-					       "match old mode (%o) of %s"),
-					patch->new_mode, new_name,
-					patch->old_mode, old_name);
-		}
-	}
-
-	if (!state->unsafe_paths)
-		die_on_unsafe_path(patch);
-
-	/*
-	 * An attempt to read from or delete a path that is beyond a
-	 * symbolic link will be prevented by load_patch_target() that
-	 * is called at the beginning of apply_data() so we do not
-	 * have to worry about a patch marked with "is_delete" bit
-	 * here.  We however need to make sure that the patch result
-	 * is not deposited to a path that is beyond a symbolic link
-	 * here.
-	 */
-	if (!patch->is_delete && path_is_beyond_symlink(state, patch->new_name))
-		return error(_("affected file '%s' is beyond a symbolic link"),
-			     patch->new_name);
-
-	if (apply_data(state, patch, &st, ce) < 0)
-		return error(_("%s: patch does not apply"), name);
-	patch->rejected = 0;
-	return 0;
-}
-
-static int check_patch_list(struct apply_state *state, struct patch *patch)
-{
-	int err = 0;
-
-	prepare_symlink_changes(state, patch);
-	prepare_fn_table(state, patch);
-	while (patch) {
-		if (state->apply_verbosely)
-			say_patch_name(stderr,
-				       _("Checking patch %s..."), patch);
-		err |= check_patch(state, patch);
-		patch = patch->next;
-	}
-	return err;
-}
-
-/* This function tries to read the sha1 from the current index */
-static int get_current_sha1(const char *path, unsigned char *sha1)
-{
-	int pos;
-
-	if (read_cache() < 0)
-		return -1;
-	pos = cache_name_pos(path, strlen(path));
-	if (pos < 0)
-		return -1;
-	hashcpy(sha1, active_cache[pos]->sha1);
-	return 0;
-}
-
-static int preimage_sha1_in_gitlink_patch(struct patch *p, unsigned char sha1[20])
-{
-	/*
-	 * A usable gitlink patch has only one fragment (hunk) that looks like:
-	 * @@ -1 +1 @@
-	 * -Subproject commit <old sha1>
-	 * +Subproject commit <new sha1>
-	 * or
-	 * @@ -1 +0,0 @@
-	 * -Subproject commit <old sha1>
-	 * for a removal patch.
-	 */
-	struct fragment *hunk = p->fragments;
-	static const char heading[] = "-Subproject commit ";
-	char *preimage;
-
-	if (/* does the patch have only one hunk? */
-	    hunk && !hunk->next &&
-	    /* is its preimage one line? */
-	    hunk->oldpos == 1 && hunk->oldlines == 1 &&
-	    /* does preimage begin with the heading? */
-	    (preimage = memchr(hunk->patch, '\n', hunk->size)) != NULL &&
-	    starts_with(++preimage, heading) &&
-	    /* does it record full SHA-1? */
-	    !get_sha1_hex(preimage + sizeof(heading) - 1, sha1) &&
-	    preimage[sizeof(heading) + 40 - 1] == '\n' &&
-	    /* does the abbreviated name on the index line agree with it? */
-	    starts_with(preimage + sizeof(heading) - 1, p->old_sha1_prefix))
-		return 0; /* it all looks fine */
-
-	/* we may have full object name on the index line */
-	return get_sha1_hex(p->old_sha1_prefix, sha1);
-}
-
-/* Build an index that contains the just the files needed for a 3way merge */
-static void build_fake_ancestor(struct patch *list, const char *filename)
-{
-	struct patch *patch;
-	struct index_state result = { NULL };
-	static struct lock_file lock;
-
-	/* Once we start supporting the reverse patch, it may be
-	 * worth showing the new sha1 prefix, but until then...
-	 */
-	for (patch = list; patch; patch = patch->next) {
-		unsigned char sha1[20];
-		struct cache_entry *ce;
-		const char *name;
-
-		name = patch->old_name ? patch->old_name : patch->new_name;
-		if (0 < patch->is_new)
-			continue;
-
-		if (S_ISGITLINK(patch->old_mode)) {
-			if (!preimage_sha1_in_gitlink_patch(patch, sha1))
-				; /* ok, the textual part looks sane */
-			else
-				die("sha1 information is lacking or useless for submodule %s",
-				    name);
-		} else if (!get_sha1_blob(patch->old_sha1_prefix, sha1)) {
-			; /* ok */
-		} else if (!patch->lines_added && !patch->lines_deleted) {
-			/* mode-only change: update the current */
-			if (get_current_sha1(patch->old_name, sha1))
-				die("mode change for %s, which is not "
-				    "in current HEAD", name);
-		} else
-			die("sha1 information is lacking or useless "
-			    "(%s).", name);
-
-		ce = make_cache_entry(patch->old_mode, sha1, name, 0, 0);
-		if (!ce)
-			die(_("make_cache_entry failed for path '%s'"), name);
-		if (add_index_entry(&result, ce, ADD_CACHE_OK_TO_ADD))
-			die ("Could not add %s to temporary index", name);
-	}
-
-	hold_lock_file_for_update(&lock, filename, LOCK_DIE_ON_ERROR);
-	if (write_locked_index(&result, &lock, COMMIT_LOCK))
-		die ("Could not write temporary index to %s", filename);
-
-	discard_index(&result);
-}
-
-static void stat_patch_list(struct apply_state *state, struct patch *patch)
-{
-	int files, adds, dels;
-
-	for (files = adds = dels = 0 ; patch ; patch = patch->next) {
-		files++;
-		adds += patch->lines_added;
-		dels += patch->lines_deleted;
-		show_stats(state, patch);
-	}
-
-	print_stat_summary(stdout, files, adds, dels);
-}
-
-static void numstat_patch_list(struct apply_state *state,
-			       struct patch *patch)
-{
-	for ( ; patch; patch = patch->next) {
-		const char *name;
-		name = patch->new_name ? patch->new_name : patch->old_name;
-		if (patch->is_binary)
-			printf("-\t-\t");
-		else
-			printf("%d\t%d\t", patch->lines_added, patch->lines_deleted);
-		write_name_quoted(name, stdout, state->line_termination);
-	}
-}
-
-static void show_file_mode_name(const char *newdelete, unsigned int mode, const char *name)
-{
-	if (mode)
-		printf(" %s mode %06o %s\n", newdelete, mode, name);
-	else
-		printf(" %s %s\n", newdelete, name);
-}
-
-static void show_mode_change(struct patch *p, int show_name)
-{
-	if (p->old_mode && p->new_mode && p->old_mode != p->new_mode) {
-		if (show_name)
-			printf(" mode change %06o => %06o %s\n",
-			       p->old_mode, p->new_mode, p->new_name);
-		else
-			printf(" mode change %06o => %06o\n",
-			       p->old_mode, p->new_mode);
-	}
-}
-
-static void show_rename_copy(struct patch *p)
-{
-	const char *renamecopy = p->is_rename ? "rename" : "copy";
-	const char *old, *new;
-
-	/* Find common prefix */
-	old = p->old_name;
-	new = p->new_name;
-	while (1) {
-		const char *slash_old, *slash_new;
-		slash_old = strchr(old, '/');
-		slash_new = strchr(new, '/');
-		if (!slash_old ||
-		    !slash_new ||
-		    slash_old - old != slash_new - new ||
-		    memcmp(old, new, slash_new - new))
-			break;
-		old = slash_old + 1;
-		new = slash_new + 1;
-	}
-	/* p->old_name thru old is the common prefix, and old and new
-	 * through the end of names are renames
-	 */
-	if (old != p->old_name)
-		printf(" %s %.*s{%s => %s} (%d%%)\n", renamecopy,
-		       (int)(old - p->old_name), p->old_name,
-		       old, new, p->score);
-	else
-		printf(" %s %s => %s (%d%%)\n", renamecopy,
-		       p->old_name, p->new_name, p->score);
-	show_mode_change(p, 0);
-}
-
-static void summary_patch_list(struct patch *patch)
-{
-	struct patch *p;
-
-	for (p = patch; p; p = p->next) {
-		if (p->is_new)
-			show_file_mode_name("create", p->new_mode, p->new_name);
-		else if (p->is_delete)
-			show_file_mode_name("delete", p->old_mode, p->old_name);
-		else {
-			if (p->is_rename || p->is_copy)
-				show_rename_copy(p);
-			else {
-				if (p->score) {
-					printf(" rewrite %s (%d%%)\n",
-					       p->new_name, p->score);
-					show_mode_change(p, 0);
-				}
-				else
-					show_mode_change(p, 1);
-			}
-		}
-	}
-}
-
-static void patch_stats(struct apply_state *state, struct patch *patch)
-{
-	int lines = patch->lines_added + patch->lines_deleted;
-
-	if (lines > state->max_change)
-		state->max_change = lines;
-	if (patch->old_name) {
-		int len = quote_c_style(patch->old_name, NULL, NULL, 0);
-		if (!len)
-			len = strlen(patch->old_name);
-		if (len > state->max_len)
-			state->max_len = len;
-	}
-	if (patch->new_name) {
-		int len = quote_c_style(patch->new_name, NULL, NULL, 0);
-		if (!len)
-			len = strlen(patch->new_name);
-		if (len > state->max_len)
-			state->max_len = len;
-	}
-}
-
-static void remove_file(struct apply_state *state, struct patch *patch, int rmdir_empty)
-{
-	if (state->update_index) {
-		if (remove_file_from_cache(patch->old_name) < 0)
-			die(_("unable to remove %s from index"), patch->old_name);
-	}
-	if (!state->cached) {
-		if (!remove_or_warn(patch->old_mode, patch->old_name) && rmdir_empty) {
-			remove_path(patch->old_name);
-		}
-	}
-}
-
-static void add_index_file(struct apply_state *state,
-			   const char *path,
-			   unsigned mode,
-			   void *buf,
-			   unsigned long size)
-{
-	struct stat st;
-	struct cache_entry *ce;
-	int namelen = strlen(path);
-	unsigned ce_size = cache_entry_size(namelen);
-
-	if (!state->update_index)
-		return;
-
-	ce = xcalloc(1, ce_size);
-	memcpy(ce->name, path, namelen);
-	ce->ce_mode = create_ce_mode(mode);
-	ce->ce_flags = create_ce_flags(0);
-	ce->ce_namelen = namelen;
-	if (S_ISGITLINK(mode)) {
-		const char *s;
-
-		if (!skip_prefix(buf, "Subproject commit ", &s) ||
-		    get_sha1_hex(s, ce->sha1))
-			die(_("corrupt patch for submodule %s"), path);
-	} else {
-		if (!state->cached) {
-			if (lstat(path, &st) < 0)
-				die_errno(_("unable to stat newly created file '%s'"),
-					  path);
-			fill_stat_cache_info(ce, &st);
-		}
-		if (write_sha1_file(buf, size, blob_type, ce->sha1) < 0)
-			die(_("unable to create backing store for newly created file %s"), path);
-	}
-	if (add_cache_entry(ce, ADD_CACHE_OK_TO_ADD) < 0)
-		die(_("unable to add cache entry for %s"), path);
-}
-
-static int try_create_file(const char *path, unsigned int mode, const char *buf, unsigned long size)
-{
-	int fd;
-	struct strbuf nbuf = STRBUF_INIT;
-
-	if (S_ISGITLINK(mode)) {
-		struct stat st;
-		if (!lstat(path, &st) && S_ISDIR(st.st_mode))
-			return 0;
-		return mkdir(path, 0777);
-	}
-
-	if (has_symlinks && S_ISLNK(mode))
-		/* Although buf:size is counted string, it also is NUL
-		 * terminated.
-		 */
-		return symlink(buf, path);
-
-	fd = open(path, O_CREAT | O_EXCL | O_WRONLY, (mode & 0100) ? 0777 : 0666);
-	if (fd < 0)
-		return -1;
-
-	if (convert_to_working_tree(path, buf, size, &nbuf)) {
-		size = nbuf.len;
-		buf  = nbuf.buf;
-	}
-	write_or_die(fd, buf, size);
-	strbuf_release(&nbuf);
-
-	if (close(fd) < 0)
-		die_errno(_("closing file '%s'"), path);
-	return 0;
-}
-
-/*
- * We optimistically assume that the directories exist,
- * which is true 99% of the time anyway. If they don't,
- * we create them and try again.
- */
-static void create_one_file(struct apply_state *state,
-			    char *path,
-			    unsigned mode,
-			    const char *buf,
-			    unsigned long size)
-{
-	if (state->cached)
-		return;
-	if (!try_create_file(path, mode, buf, size))
-		return;
-
-	if (errno == ENOENT) {
-		if (safe_create_leading_directories(path))
-			return;
-		if (!try_create_file(path, mode, buf, size))
-			return;
-	}
-
-	if (errno == EEXIST || errno == EACCES) {
-		/* We may be trying to create a file where a directory
-		 * used to be.
-		 */
-		struct stat st;
-		if (!lstat(path, &st) && (!S_ISDIR(st.st_mode) || !rmdir(path)))
-			errno = EEXIST;
-	}
-
-	if (errno == EEXIST) {
-		unsigned int nr = getpid();
-
-		for (;;) {
-			char newpath[PATH_MAX];
-			mksnpath(newpath, sizeof(newpath), "%s~%u", path, nr);
-			if (!try_create_file(newpath, mode, buf, size)) {
-				if (!rename(newpath, path))
-					return;
-				unlink_or_warn(newpath);
-				break;
-			}
-			if (errno != EEXIST)
-				break;
-			++nr;
-		}
-	}
-	die_errno(_("unable to write file '%s' mode %o"), path, mode);
-}
-
-static void add_conflicted_stages_file(struct apply_state *state,
-				       struct patch *patch)
-{
-	int stage, namelen;
-	unsigned ce_size, mode;
-	struct cache_entry *ce;
-
-	if (!state->update_index)
-		return;
-	namelen = strlen(patch->new_name);
-	ce_size = cache_entry_size(namelen);
-	mode = patch->new_mode ? patch->new_mode : (S_IFREG | 0644);
-
-	remove_file_from_cache(patch->new_name);
-	for (stage = 1; stage < 4; stage++) {
-		if (is_null_oid(&patch->threeway_stage[stage - 1]))
-			continue;
-		ce = xcalloc(1, ce_size);
-		memcpy(ce->name, patch->new_name, namelen);
-		ce->ce_mode = create_ce_mode(mode);
-		ce->ce_flags = create_ce_flags(stage);
-		ce->ce_namelen = namelen;
-		hashcpy(ce->sha1, patch->threeway_stage[stage - 1].hash);
-		if (add_cache_entry(ce, ADD_CACHE_OK_TO_ADD) < 0)
-			die(_("unable to add cache entry for %s"), patch->new_name);
-	}
-}
-
-static void create_file(struct apply_state *state, struct patch *patch)
-{
-	char *path = patch->new_name;
-	unsigned mode = patch->new_mode;
-	unsigned long size = patch->resultsize;
-	char *buf = patch->result;
-
-	if (!mode)
-		mode = S_IFREG | 0644;
-	create_one_file(state, path, mode, buf, size);
-
-	if (patch->conflicted_threeway)
-		add_conflicted_stages_file(state, patch);
-	else
-		add_index_file(state, path, mode, buf, size);
-}
-
-/* phase zero is to remove, phase one is to create */
-static void write_out_one_result(struct apply_state *state,
-				 struct patch *patch,
-				 int phase)
-{
-	if (patch->is_delete > 0) {
-		if (phase == 0)
-			remove_file(state, patch, 1);
-		return;
-	}
-	if (patch->is_new > 0 || patch->is_copy) {
-		if (phase == 1)
-			create_file(state, patch);
-		return;
-	}
-	/*
-	 * Rename or modification boils down to the same
-	 * thing: remove the old, write the new
-	 */
-	if (phase == 0)
-		remove_file(state, patch, patch->is_rename);
-	if (phase == 1)
-		create_file(state, patch);
-}
-
-static int write_out_one_reject(struct apply_state *state, struct patch *patch)
-{
-	FILE *rej;
-	char namebuf[PATH_MAX];
-	struct fragment *frag;
-	int cnt = 0;
-	struct strbuf sb = STRBUF_INIT;
-
-	for (cnt = 0, frag = patch->fragments; frag; frag = frag->next) {
-		if (!frag->rejected)
-			continue;
-		cnt++;
-	}
-
-	if (!cnt) {
-		if (state->apply_verbosely)
-			say_patch_name(stderr,
-				       _("Applied patch %s cleanly."), patch);
-		return 0;
-	}
-
-	/* This should not happen, because a removal patch that leaves
-	 * contents are marked "rejected" at the patch level.
-	 */
-	if (!patch->new_name)
-		die(_("internal error"));
-
-	/* Say this even without --verbose */
-	strbuf_addf(&sb, Q_("Applying patch %%s with %d reject...",
-			    "Applying patch %%s with %d rejects...",
-			    cnt),
-		    cnt);
-	say_patch_name(stderr, sb.buf, patch);
-	strbuf_release(&sb);
-
-	cnt = strlen(patch->new_name);
-	if (ARRAY_SIZE(namebuf) <= cnt + 5) {
-		cnt = ARRAY_SIZE(namebuf) - 5;
-		warning(_("truncating .rej filename to %.*s.rej"),
-			cnt - 1, patch->new_name);
-	}
-	memcpy(namebuf, patch->new_name, cnt);
-	memcpy(namebuf + cnt, ".rej", 5);
-
-	rej = fopen(namebuf, "w");
-	if (!rej)
-		return error(_("cannot open %s: %s"), namebuf, strerror(errno));
-
-	/* Normal git tools never deal with .rej, so do not pretend
-	 * this is a git patch by saying --git or giving extended
-	 * headers.  While at it, maybe please "kompare" that wants
-	 * the trailing TAB and some garbage at the end of line ;-).
-	 */
-	fprintf(rej, "diff a/%s b/%s\t(rejected hunks)\n",
-		patch->new_name, patch->new_name);
-	for (cnt = 1, frag = patch->fragments;
-	     frag;
-	     cnt++, frag = frag->next) {
-		if (!frag->rejected) {
-			fprintf_ln(stderr, _("Hunk #%d applied cleanly."), cnt);
-			continue;
-		}
-		fprintf_ln(stderr, _("Rejected hunk #%d."), cnt);
-		fprintf(rej, "%.*s", frag->size, frag->patch);
-		if (frag->patch[frag->size-1] != '\n')
-			fputc('\n', rej);
-	}
-	fclose(rej);
-	return -1;
-}
-
-static int write_out_results(struct apply_state *state, struct patch *list)
-{
-	int phase;
-	int errs = 0;
-	struct patch *l;
-	struct string_list cpath = STRING_LIST_INIT_DUP;
-
-	for (phase = 0; phase < 2; phase++) {
-		l = list;
-		while (l) {
-			if (l->rejected)
-				errs = 1;
-			else {
-				write_out_one_result(state, l, phase);
-				if (phase == 1) {
-					if (write_out_one_reject(state, l))
-						errs = 1;
-					if (l->conflicted_threeway) {
-						string_list_append(&cpath, l->new_name);
-						errs = 1;
-					}
-				}
-			}
-			l = l->next;
-		}
-	}
-
-	if (cpath.nr) {
-		struct string_list_item *item;
-
-		string_list_sort(&cpath);
-		for_each_string_list_item(item, &cpath)
-			fprintf(stderr, "U %s\n", item->string);
-		string_list_clear(&cpath, 0);
-
-		rerere(0);
-	}
-
-	return errs;
-}
-
 static struct lock_file lock_file;
 
-#define INACCURATE_EOF	(1<<0)
-#define RECOUNT		(1<<1)
-
-static int apply_patch(struct apply_state *state,
-		       int fd,
-		       const char *filename,
-		       int options)
-{
-	size_t offset;
-	struct strbuf buf = STRBUF_INIT; /* owns the patch text */
-	struct patch *list = NULL, **listp = &list;
-	int skipped_patch = 0;
-
-	state->patch_input_file = filename;
-	read_patch_file(&buf, fd);
-	offset = 0;
-	while (offset < buf.len) {
-		struct patch *patch;
-		int nr;
-
-		patch = xcalloc(1, sizeof(*patch));
-		patch->inaccurate_eof = !!(options & INACCURATE_EOF);
-		patch->recount =  !!(options & RECOUNT);
-		nr = parse_chunk(state, buf.buf + offset, buf.len - offset, patch);
-		if (nr < 0) {
-			free_patch(patch);
-			break;
-		}
-		if (state->apply_in_reverse)
-			reverse_patches(patch);
-		if (use_patch(state, patch)) {
-			patch_stats(state, patch);
-			*listp = patch;
-			listp = &patch->next;
-		}
-		else {
-			if (state->apply_verbosely)
-				say_patch_name(stderr, _("Skipped patch '%s'."), patch);
-			free_patch(patch);
-			skipped_patch++;
-		}
-		offset += nr;
-	}
-
-	if (!list && !skipped_patch)
-		die(_("unrecognized input"));
-
-	if (state->whitespace_error && (state->ws_error_action == die_on_ws_error))
-		state->apply = 0;
-
-	state->update_index = state->check_index && state->apply;
-	if (state->update_index && state->newfd < 0)
-		state->newfd = hold_locked_index(state->lock_file, 1);
-
-	if (state->check_index) {
-		if (read_cache() < 0)
-			die(_("unable to read index file"));
-	}
-
-	if ((state->check || state->apply) &&
-	    check_patch_list(state, list) < 0 &&
-	    !state->apply_with_reject)
-		exit(1);
-
-	if (state->apply && write_out_results(state, list)) {
-		if (state->apply_with_reject)
-			exit(1);
-		/* with --3way, we still need to write the index out */
-		return 1;
-	}
-
-	if (state->fake_ancestor)
-		build_fake_ancestor(list, state->fake_ancestor);
-
-	if (state->diffstat)
-		stat_patch_list(state, list);
-
-	if (state->numstat)
-		numstat_patch_list(state, list);
-
-	if (state->summary)
-		summary_patch_list(list);
-
-	free_patch_list(list);
-	strbuf_release(&buf);
-	string_list_clear(&state->fn_table, 0);
-	return 0;
-}
-
-static void git_apply_config(void)
-{
-	git_config_get_string_const("apply.whitespace", &apply_default_whitespace);
-	git_config_get_string_const("apply.ignorewhitespace", &apply_default_ignorewhitespace);
-	git_config(git_default_config, NULL);
-}
-
-static int option_parse_exclude(const struct option *opt,
-				const char *arg, int unset)
-{
-	struct apply_state *state = opt->value;
-	add_name_limit(state, arg, 1);
-	return 0;
-}
-
-static int option_parse_include(const struct option *opt,
-				const char *arg, int unset)
-{
-	struct apply_state *state = opt->value;
-	add_name_limit(state, arg, 0);
-	state->has_include = 1;
-	return 0;
-}
-
-static int option_parse_p(const struct option *opt,
-			  const char *arg,
-			  int unset)
-{
-	struct apply_state *state = opt->value;
-	state->p_value = atoi(arg);
-	state->p_value_known = 1;
-	return 0;
-}
-
-static int option_parse_space_change(const struct option *opt,
-				     const char *arg, int unset)
-{
-	struct apply_state *state = opt->value;
-	if (unset)
-		state->ws_ignore_action = ignore_ws_none;
-	else
-		state->ws_ignore_action = ignore_ws_change;
-	return 0;
-}
-
-static int option_parse_whitespace(const struct option *opt,
-				   const char *arg, int unset)
-{
-	struct apply_state *state = opt->value;
-	state->whitespace_option = arg;
-	parse_whitespace_option(state, arg);
-	return 0;
-}
-
-static int option_parse_directory(const struct option *opt,
-				  const char *arg, int unset)
-{
-	struct apply_state *state = opt->value;
-	strbuf_reset(&state->root);
-	strbuf_addstr(&state->root, arg);
-	strbuf_complete(&state->root, '/');
-	return 0;
-}
-
-static void init_apply_state(struct apply_state *state,
-			     const char *prefix,
-			     struct lock_file *lock_file)
-{
-	memset(state, 0, sizeof(*state));
-	state->prefix = prefix;
-	state->prefix_length = state->prefix ? strlen(state->prefix) : 0;
-	state->lock_file = lock_file;
-	state->newfd = -1;
-	state->apply = 1;
-	state->line_termination = '\n';
-	state->p_value = 1;
-	state->p_context = UINT_MAX;
-	state->squelch_whitespace_errors = 5;
-	state->ws_error_action = warn_on_ws_error;
-	state->ws_ignore_action = ignore_ws_none;
-	state->linenr = 1;
-	string_list_init(&state->fn_table, 0);
-	string_list_init(&state->limit_by_name, 0);
-	string_list_init(&state->symlink_changes, 0);
-	strbuf_init(&state->root, 0);
-
-	git_apply_config();
-	if (apply_default_whitespace)
-		parse_whitespace_option(state, apply_default_whitespace);
-	if (apply_default_ignorewhitespace)
-		parse_ignorewhitespace_option(state, apply_default_ignorewhitespace);
-}
-
-static void clear_apply_state(struct apply_state *state)
-{
-	string_list_clear(&state->limit_by_name, 0);
-	string_list_clear(&state->symlink_changes, 0);
-	strbuf_release(&state->root);
-
-	/* &state->fn_table is cleared at the end of apply_patch() */
-}
-
-static void check_apply_state(struct apply_state *state, int force_apply)
-{
-	int is_not_gitdir = !startup_info->have_repository;
-
-	if (state->apply_with_reject && state->threeway)
-		die("--reject and --3way cannot be used together.");
-	if (state->cached && state->threeway)
-		die("--cached and --3way cannot be used together.");
-	if (state->threeway) {
-		if (is_not_gitdir)
-			die(_("--3way outside a repository"));
-		state->check_index = 1;
-	}
-	if (state->apply_with_reject)
-		state->apply = state->apply_verbosely = 1;
-	if (!force_apply && (state->diffstat || state->numstat || state->summary || state->check || state->fake_ancestor))
-		state->apply = 0;
-	if (state->check_index && is_not_gitdir)
-		die(_("--index outside a repository"));
-	if (state->cached) {
-		if (is_not_gitdir)
-			die(_("--cached outside a repository"));
-		state->check_index = 1;
-	}
-	if (state->check_index)
-		state->unsafe_paths = 0;
-	if (!state->lock_file)
-		die("BUG: state->lock_file should not be NULL");
-}
-
-static int apply_all_patches(struct apply_state *state,
-			     int argc,
-			     const char **argv,
-			     int options)
-{
-	int i;
-	int errs = 0;
-	int read_stdin = 1;
-
-	for (i = 0; i < argc; i++) {
-		const char *arg = argv[i];
-		int fd;
-
-		if (!strcmp(arg, "-")) {
-			errs |= apply_patch(state, 0, "<stdin>", options);
-			read_stdin = 0;
-			continue;
-		} else if (0 < state->prefix_length)
-			arg = prefix_filename(state->prefix,
-					      state->prefix_length,
-					      arg);
-
-		fd = open(arg, O_RDONLY);
-		if (fd < 0)
-			die_errno(_("can't open patch '%s'"), arg);
-		read_stdin = 0;
-		set_default_whitespace_mode(state);
-		errs |= apply_patch(state, fd, arg, options);
-		close(fd);
-	}
-	set_default_whitespace_mode(state);
-	if (read_stdin)
-		errs |= apply_patch(state, 0, "<stdin>", options);
-
-	if (state->whitespace_error) {
-		if (state->squelch_whitespace_errors &&
-		    state->squelch_whitespace_errors < state->whitespace_error) {
-			int squelched =
-				state->whitespace_error - state->squelch_whitespace_errors;
-			warning(Q_("squelched %d whitespace error",
-				   "squelched %d whitespace errors",
-				   squelched),
-				squelched);
-		}
-		if (state->ws_error_action == die_on_ws_error)
-			die(Q_("%d line adds whitespace errors.",
-			       "%d lines add whitespace errors.",
-			       state->whitespace_error),
-			    state->whitespace_error);
-		if (state->applied_after_fixing_ws && state->apply)
-			warning("%d line%s applied after"
-				" fixing whitespace errors.",
-				state->applied_after_fixing_ws,
-				state->applied_after_fixing_ws == 1 ? "" : "s");
-		else if (state->whitespace_error)
-			warning(Q_("%d line adds whitespace errors.",
-				   "%d lines add whitespace errors.",
-				   state->whitespace_error),
-				state->whitespace_error);
-	}
-
-	if (state->update_index) {
-		if (write_locked_index(&the_index, state->lock_file, COMMIT_LOCK))
-			die(_("Unable to write new index file"));
-		state->newfd = -1;
-	}
-
-	return !!errs;
-}
-
 int cmd_apply(int argc, const char **argv, const char *prefix)
 {
 	int force_apply = 0;
@@ -4795,81 +18,15 @@ int cmd_apply(int argc, const char **argv, const char *prefix)
 	int ret;
 	struct apply_state state;
 
-	struct option builtin_apply_options[] = {
-		{ OPTION_CALLBACK, 0, "exclude", &state, N_("path"),
-			N_("don't apply changes matching the given path"),
-			0, option_parse_exclude },
-		{ OPTION_CALLBACK, 0, "include", &state, N_("path"),
-			N_("apply changes matching the given path"),
-			0, option_parse_include },
-		{ OPTION_CALLBACK, 'p', NULL, &state, N_("num"),
-			N_("remove <num> leading slashes from traditional diff paths"),
-			0, option_parse_p },
-		OPT_BOOL(0, "no-add", &state.no_add,
-			N_("ignore additions made by the patch")),
-		OPT_BOOL(0, "stat", &state.diffstat,
-			N_("instead of applying the patch, output diffstat for the input")),
-		OPT_NOOP_NOARG(0, "allow-binary-replacement"),
-		OPT_NOOP_NOARG(0, "binary"),
-		OPT_BOOL(0, "numstat", &state.numstat,
-			N_("show number of added and deleted lines in decimal notation")),
-		OPT_BOOL(0, "summary", &state.summary,
-			N_("instead of applying the patch, output a summary for the input")),
-		OPT_BOOL(0, "check", &state.check,
-			N_("instead of applying the patch, see if the patch is applicable")),
-		OPT_BOOL(0, "index", &state.check_index,
-			N_("make sure the patch is applicable to the current index")),
-		OPT_BOOL(0, "cached", &state.cached,
-			N_("apply a patch without touching the working tree")),
-		OPT_BOOL(0, "unsafe-paths", &state.unsafe_paths,
-			N_("accept a patch that touches outside the working area")),
-		OPT_BOOL(0, "apply", &force_apply,
-			N_("also apply the patch (use with --stat/--summary/--check)")),
-		OPT_BOOL('3', "3way", &state.threeway,
-			 N_( "attempt three-way merge if a patch does not apply")),
-		OPT_FILENAME(0, "build-fake-ancestor", &state.fake_ancestor,
-			N_("build a temporary index based on embedded index information")),
-		/* Think twice before adding "--nul" synonym to this */
-		OPT_SET_INT('z', NULL, &state.line_termination,
-			N_("paths are separated with NUL character"), '\0'),
-		OPT_INTEGER('C', NULL, &state.p_context,
-				N_("ensure at least <n> lines of context match")),
-		{ OPTION_CALLBACK, 0, "whitespace", &state, N_("action"),
-			N_("detect new or modified lines that have whitespace errors"),
-			0, option_parse_whitespace },
-		{ OPTION_CALLBACK, 0, "ignore-space-change", &state, NULL,
-			N_("ignore changes in whitespace when finding context"),
-			PARSE_OPT_NOARG, option_parse_space_change },
-		{ OPTION_CALLBACK, 0, "ignore-whitespace", &state, NULL,
-			N_("ignore changes in whitespace when finding context"),
-			PARSE_OPT_NOARG, option_parse_space_change },
-		OPT_BOOL('R', "reverse", &state.apply_in_reverse,
-			N_("apply the patch in reverse")),
-		OPT_BOOL(0, "unidiff-zero", &state.unidiff_zero,
-			N_("don't expect at least one line of context")),
-		OPT_BOOL(0, "reject", &state.apply_with_reject,
-			N_("leave the rejected hunks in corresponding *.rej files")),
-		OPT_BOOL(0, "allow-overlap", &state.allow_overlap,
-			N_("allow overlapping hunks")),
-		OPT__VERBOSE(&state.apply_verbosely, N_("be verbose")),
-		OPT_BIT(0, "inaccurate-eof", &options,
-			N_("tolerate incorrectly detected missing new-line at the end of file"),
-			INACCURATE_EOF),
-		OPT_BIT(0, "recount", &options,
-			N_("do not trust the line counts in the hunk headers"),
-			RECOUNT),
-		{ OPTION_CALLBACK, 0, "directory", &state, N_("root"),
-			N_("prepend <root> to all filenames"),
-			0, option_parse_directory },
-		OPT_END()
-	};
-
-	init_apply_state(&state, prefix, &lock_file);
+	if (init_apply_state(&state, prefix, &lock_file))
+		exit(128);
 
-	argc = parse_options(argc, argv, state.prefix, builtin_apply_options,
-			apply_usage, 0);
+	argc = apply_parse_options(argc, argv,
+				   &state, &force_apply, &options,
+				   apply_usage);
 
-	check_apply_state(&state, force_apply);
+	if (check_apply_state(&state, force_apply))
+		exit(128);
 
 	ret = apply_all_patches(&state, argc, argv, options);
 
diff --git a/git-compat-util.h b/git-compat-util.h
index 68615b1a6a..37cce0746f 100644
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -441,6 +441,9 @@ static inline int const_error(void)
 
 extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
 extern void set_error_routine(void (*routine)(const char *err, va_list params));
+extern void (*get_error_routine(void))(const char *err, va_list params);
+extern void set_warn_routine(void (*routine)(const char *warn, va_list params));
+extern void (*get_warn_routine(void))(const char *warn, va_list params);
 extern void set_die_is_recursing_routine(int (*routine)(void));
 extern void set_error_handle(FILE *);
 
diff --git a/t/t4012-diff-binary.sh b/t/t4012-diff-binary.sh
index 643d729157..0a8af76aab 100755
--- a/t/t4012-diff-binary.sh
+++ b/t/t4012-diff-binary.sh
@@ -68,7 +68,7 @@ test_expect_success C_LOCALE_OUTPUT 'apply detecting corrupt patch correctly' '
 	sed -e "s/-CIT/xCIT/" <output >broken &&
 	test_must_fail git apply --stat --summary broken 2>detected &&
 	detected=$(cat detected) &&
-	detected=$(expr "$detected" : "fatal.*at line \\([0-9]*\\)\$") &&
+	detected=$(expr "$detected" : "error.*at line \\([0-9]*\\)\$") &&
 	detected=$(sed -ne "${detected}p" broken) &&
 	test "$detected" = xCIT
 '
@@ -77,7 +77,7 @@ test_expect_success C_LOCALE_OUTPUT 'apply detecting corrupt patch correctly' '
 	git diff --binary | sed -e "s/-CIT/xCIT/" >broken &&
 	test_must_fail git apply --stat --summary broken 2>detected &&
 	detected=$(cat detected) &&
-	detected=$(expr "$detected" : "fatal.*at line \\([0-9]*\\)\$") &&
+	detected=$(expr "$detected" : "error.*at line \\([0-9]*\\)\$") &&
 	detected=$(sed -ne "${detected}p" broken) &&
 	test "$detected" = xCIT
 '
diff --git a/t/t4254-am-corrupt.sh b/t/t4254-am-corrupt.sh
index 85716dd6ec..9bd7dd2ba1 100755
--- a/t/t4254-am-corrupt.sh
+++ b/t/t4254-am-corrupt.sh
@@ -29,7 +29,7 @@ test_expect_success 'try to apply corrupted patch' '
 '
 
 test_expect_success 'compare diagnostic; ensure file is still here' '
-	echo "fatal: git diff header lacks filename information (line 4)" >expected &&
+	echo "error: git diff header lacks filename information (line 4)" >expected &&
 	test_path_is_file f &&
 	test_cmp expected actual
 '
diff --git a/usage.c b/usage.c
index 0efa3faf60..17f52c1b5c 100644
--- a/usage.c
+++ b/usage.c
@@ -70,6 +70,21 @@ void set_error_routine(void (*routine)(const char *err, va_list params))
 	error_routine = routine;
 }
 
+void (*get_error_routine(void))(const char *err, va_list params)
+{
+	return error_routine;
+}
+
+void set_warn_routine(void (*routine)(const char *warn, va_list params))
+{
+	warn_routine = routine;
+}
+
+void (*get_warn_routine(void))(const char *warn, va_list params)
+{
+	return warn_routine;
+}
+
 void set_die_is_recursing_routine(int (*routine)(void))
 {
 	die_is_recursing = routine;