diff options
Diffstat (limited to 'apply.c')
| -rw-r--r-- | apply.c | 4980 |
1 files changed, 4980 insertions, 0 deletions
diff --git a/apply.c b/apply.c new file mode 100644 index 0000000000..c49cef0637 --- /dev/null +++ b/apply.c @@ -0,0 +1,4980 @@ +/* + * 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); + re |