Extract helper bits from c-merge-recursive work

This backports the pieces that are not uncooked from the merge-recursive
WIP we have seen earlier, to be used in git-mv rewritten in C.

Signed-off-by: Junio C Hamano <junkio@cox.net>

4 files changed, 172 insertions, 45 deletions

diff --git a/cache.h b/cache.h
index eee5fc9f8d..d0b1f2730f 100644
--- a/cache.h
+++ b/cache.h
@@ -115,6 +115,7 @@ static inline unsigned int create_ce_mode(unsigned int mode)
 extern struct cache_entry **active_cache;
 extern unsigned int active_nr, active_alloc, active_cache_changed;
 extern struct cache_tree *active_cache_tree;
+extern int cache_errno;
 
 #define GIT_DIR_ENVIRONMENT "GIT_DIR"
 #define DEFAULT_GIT_DIR_ENVIRONMENT ".git"
@@ -142,6 +143,7 @@ extern void verify_non_filename(const char *prefix, const char *name);
 
 /* Initialize and use the cache information */
 extern int read_cache(void);
+extern int read_cache_from(const char *path);
 extern int write_cache(int newfd, struct cache_entry **cache, int entries);
 extern int verify_path(const char *path);
 extern int cache_name_pos(const char *name, int namelen);
@@ -149,6 +151,7 @@ extern int cache_name_pos(const char *name, int namelen);
 #define ADD_CACHE_OK_TO_REPLACE 2	/* Ok to replace file/directory */
 #define ADD_CACHE_SKIP_DFCHECK 4	/* Ok to skip DF conflict checks */
 extern int add_cache_entry(struct cache_entry *ce, int option);
+extern struct cache_entry *refresh_cache_entry(struct cache_entry *ce, int really);
 extern int remove_cache_entry_at(int pos);
 extern int remove_file_from_cache(const char *path);
 extern int ce_same_name(struct cache_entry *a, struct cache_entry *b);
diff --git a/path-list.c b/path-list.c
new file mode 100644
index 0000000000..f15a10de37
--- /dev/null
+++ b/path-list.c
@@ -0,0 +1,105 @@
+#include <stdio.h>
+#include "cache.h"
+#include "path-list.h"
+
+/* if there is no exact match, point to the index where the entry could be
+ * inserted */
+static int get_entry_index(const struct path_list *list, const char *path,
+		int *exact_match)
+{
+	int left = -1, right = list->nr;
+
+	while (left + 1 < right) {
+		int middle = (left + right) / 2;
+		int compare = strcmp(path, list->items[middle].path);
+		if (compare < 0)
+			right = middle;
+		else if (compare > 0)
+			left = middle;
+		else {
+			*exact_match = 1;
+			return middle;
+		}
+	}
+
+	*exact_match = 0;
+	return right;
+}
+
+/* returns -1-index if already exists */
+static int add_entry(struct path_list *list, const char *path)
+{
+	int exact_match;
+	int index = get_entry_index(list, path, &exact_match);
+
+	if (exact_match)
+		return -1 - index;
+
+	if (list->nr + 1 >= list->alloc) {
+		list->alloc += 32;
+		list->items = xrealloc(list->items, list->alloc
+				* sizeof(struct path_list_item));
+	}
+	if (index < list->nr)
+		memmove(list->items + index + 1, list->items + index,
+				(list->nr - index)
+				* sizeof(struct path_list_item));
+	list->items[index].path = list->strdup_paths ?
+		strdup(path) : (char *)path;
+	list->items[index].util = NULL;
+	list->nr++;
+
+	return index;
+}
+
+struct path_list_item *path_list_insert(const char *path, struct path_list *list)
+{
+	int index = add_entry(list, path);
+
+	if (index < 0)
+		index = 1 - index;
+
+	return list->items + index;
+}
+
+int path_list_has_path(const struct path_list *list, const char *path)
+{
+	int exact_match;
+	get_entry_index(list, path, &exact_match);
+	return exact_match;
+}
+
+struct path_list_item *path_list_lookup(const char *path, struct path_list *list)
+{
+	int exact_match, i = get_entry_index(list, path, &exact_match);
+	if (!exact_match)
+		return NULL;
+	return list->items + i;
+}
+
+void path_list_clear(struct path_list *list, int free_items)
+{
+	if (list->items) {
+		int i;
+		if (free_items)
+			for (i = 0; i < list->nr; i++) {
+				if (list->strdup_paths)
+					free(list->items[i].path);
+				if (list->items[i].util)
+					free(list->items[i].util);
+			}
+		free(list->items);
+	}
+	list->items = NULL;
+	list->nr = list->alloc = 0;
+}
+
+void print_path_list(const char *text, const struct path_list *p)
+{
+	int i;
+	if ( text )
+		printf("%s\n", text);
+	for (i = 0; i < p->nr; i++)
+		printf("%s:%p\n", p->items[i].path, p->items[i].util);
+}
+
diff --git a/path-list.h b/path-list.h
new file mode 100644
index 0000000000..d6401eaa35
--- /dev/null
+++ b/path-list.h
@@ -0,0 +1,22 @@
+#ifndef _PATH_LIST_H_
+#define _PATH_LIST_H_
+
+struct path_list_item {
+	char *path;
+	void *util;
+};
+struct path_list
+{
+	struct path_list_item *items;
+	unsigned int nr, alloc;
+	unsigned int strdup_paths:1;
+};
+
+void print_path_list(const char *text, const struct path_list *p);
+
+int path_list_has_path(const struct path_list *list, const char *path);
+void path_list_clear(struct path_list *list, int free_items);
+struct path_list_item *path_list_insert(const char *path, struct path_list *list);
+struct path_list_item *path_list_lookup(const char *path, struct path_list *list);
+
+#endif /* _PATH_LIST_H_ */
diff --git a/read-cache.c b/read-cache.c
index a50d3612c8..4c47a0eb9f 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -24,6 +24,11 @@ unsigned int active_nr = 0, active_alloc = 0, active_cache_changed = 0;
 
 struct cache_tree *active_cache_tree = NULL;
 
+int cache_errno = 0;
+
+static void *cache_mmap = NULL;
+static size_t cache_mmap_size = 0;
+
 /*
  * This only updates the "non-critical" parts of the directory
  * cache, ie the parts that aren't tracked by GIT, and only used
@@ -577,22 +582,6 @@ int add_cache_entry(struct cache_entry *ce, int option)
 	return 0;
 }
 
-/* Three functions to allow overloaded pointer return; see linux/err.h */
-static inline void *ERR_PTR(long error)
-{
-	return (void *) error;
-}
-
-static inline long PTR_ERR(const void *ptr)
-{
-	return (long) ptr;
-}
-
-static inline long IS_ERR(const void *ptr)
-{
-	return (unsigned long)ptr > (unsigned long)-1000L;
-}
-
 /*
  * "refresh" does not calculate a new sha1 file or bring the
  * cache up-to-date for mode/content changes. But what it
@@ -604,14 +593,16 @@ static inline long IS_ERR(const void *ptr)
  * For example, you'd want to do this after doing a "git-read-tree",
  * to link up the stat cache details with the proper files.
  */
-static struct cache_entry *refresh_entry(struct cache_entry *ce, int really)
+struct cache_entry *refresh_cache_entry(struct cache_entry *ce, int really)
 {
 	struct stat st;
 	struct cache_entry *updated;
 	int changed, size;
 
-	if (lstat(ce->name, &st) < 0)
-		return ERR_PTR(-errno);
+	if (lstat(ce->name, &st) < 0) {
+		cache_errno = errno;
+		return NULL;
+	}
 
 	changed = ce_match_stat(ce, &st, really);
 	if (!changed) {
@@ -619,11 +610,13 @@ static struct cache_entry *refresh_entry(struct cache_entry *ce, int really)
 		    !(ce->ce_flags & htons(CE_VALID)))
 			; /* mark this one VALID again */
 		else
-			return NULL;
+			return ce;
 	}
 
-	if (ce_modified(ce, &st, really))
-		return ERR_PTR(-EINVAL);
+	if (ce_modified(ce, &st, really)) {
+		cache_errno = EINVAL;
+		return NULL;
+	}
 
 	size = ce_size(ce);
 	updated = xmalloc(size);
@@ -666,13 +659,13 @@ int refresh_cache(unsigned int flags)
 			continue;
 		}
 
-		new = refresh_entry(ce, really);
-		if (!new)
+		new = refresh_cache_entry(ce, really);
+		if (new == ce)
 			continue;
-		if (IS_ERR(new)) {
-			if (not_new && PTR_ERR(new) == -ENOENT)
+		if (!new) {
+			if (not_new && cache_errno == ENOENT)
 				continue;
-			if (really && PTR_ERR(new) == -EINVAL) {
+			if (really && cache_errno == EINVAL) {
 				/* If we are doing --really-refresh that
 				 * means the index is not valid anymore.
 				 */
@@ -729,39 +722,43 @@ static int read_index_extension(const char *ext, void *data, unsigned long sz)
 
 int read_cache(void)
 {
+	return read_cache_from(get_index_file());
+}
+
+/* remember to discard_cache() before reading a different cache! */
+int read_cache_from(const char *path)
+{
 	int fd, i;
 	struct stat st;
-	unsigned long size, offset;
-	void *map;
+	unsigned long offset;
 	struct cache_header *hdr;
 
 	errno = EBUSY;
-	if (active_cache)
+	if (cache_mmap)
 		return active_nr;
 
 	errno = ENOENT;
 	index_file_timestamp = 0;
-	fd = open(get_index_file(), O_RDONLY);
+	fd = open(path, O_RDONLY);
 	if (fd < 0) {
 		if (errno == ENOENT)
 			return 0;
 		die("index file open failed (%s)", strerror(errno));
 	}
 
-	size = 0; /* avoid gcc warning */
-	map = MAP_FAILED;
+	cache_mmap = MAP_FAILED;
 	if (!fstat(fd, &st)) {
-		size = st.st_size;
+		cache_mmap_size = st.st_size;
 		errno = EINVAL;
-		if (size >= sizeof(struct cache_header) + 20)
-			map = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
+		if (cache_mmap_size >= sizeof(struct cache_header) + 20)
+			cache_mmap = mmap(NULL, cache_mmap_size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
 	}
 	close(fd);
-	if (map == MAP_FAILED)
+	if (cache_mmap == MAP_FAILED)
 		die("index file mmap failed (%s)", strerror(errno));
 
-	hdr = map;
-	if (verify_hdr(hdr, size) < 0)
+	hdr = cache_mmap;
+	if (verify_hdr(hdr, cache_mmap_size) < 0)
 		goto unmap;
 
 	active_nr = ntohl(hdr->hdr_entries);
@@ -770,12 +767,12 @@ int read_cache(void)
 
 	offset = sizeof(*hdr);
 	for (i = 0; i < active_nr; i++) {
-		struct cache_entry *ce = (struct cache_entry *) ((char *) map + offset);
+		struct cache_entry *ce = (struct cache_entry *) ((char *) cache_mmap + offset);
 		offset = offset + ce_size(ce);
 		active_cache[i] = ce;
 	}
 	index_file_timestamp = st.st_mtime;
-	while (offset <= size - 20 - 8) {
+	while (offset <= cache_mmap_size - 20 - 8) {
 		/* After an array of active_nr index entries,
 		 * there can be arbitrary number of extended
 		 * sections, each of which is prefixed with
@@ -783,10 +780,10 @@ int read_cache(void)
 		 * in 4-byte network byte order.
 		 */
 		unsigned long extsize;
-		memcpy(&extsize, (char *) map + offset + 4, 4);
+		memcpy(&extsize, (char *) cache_mmap + offset + 4, 4);
 		extsize = ntohl(extsize);
-		if (read_index_extension(((const char *) map) + offset,
-					 (char *) map + offset + 8,
+		if (read_index_extension(((const char *) cache_mmap) + offset,
+					 (char *) cache_mmap + offset + 8,
 					 extsize) < 0)
 			goto unmap;
 		offset += 8;
@@ -795,7 +792,7 @@ int read_cache(void)
 	return active_nr;
 
 unmap:
-	munmap(map, size);
+	munmap(cache_mmap, cache_mmap_size);
 	errno = EINVAL;
 	die("index file corrupt");
 }