add context pointer to read_tree_recursive()

Add a pointer parameter to read_tree_recursive(), which is passed to the
callback function.  This allows callers of read_tree_recursive() to
share data with the callback without resorting to global variables.  All
current callers pass NULL.

Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

8 files changed, 28 insertions, 26 deletions

diff --git a/archive-tar.c b/archive-tar.c
index 99db58f1cf..6eaf59eb01 100644
--- a/archive-tar.c
+++ b/archive-tar.c
@@ -234,9 +234,9 @@ static int git_tar_config(const char *var, const char *value, void *cb)
 	return git_default_config(var, value, cb);
 }
 
-static int write_tar_entry(const unsigned char *sha1,
-                           const char *base, int baselen,
-                           const char *filename, unsigned mode, int stage)
+static int write_tar_entry(const unsigned char *sha1, const char *base,
+		int baselen, const char *filename, unsigned mode, int stage,
+		void *context)
 {
 	static struct strbuf path = STRBUF_INIT;
 	void *buffer;
@@ -286,11 +286,12 @@ int write_tar_archive(struct archiver_args *args)
 
 		while (baselen > 0 && base[baselen - 1] == '/')
 			base[--baselen] = '\0';
-		write_tar_entry(args->tree->object.sha1, "", 0, base, 040777, 0);
+		write_tar_entry(args->tree->object.sha1, "", 0, base, 040777,
+				0, NULL);
 		free(base);
 	}
 	read_tree_recursive(args->tree, args->base, plen, 0,
-			    args->pathspec, write_tar_entry);
+			    args->pathspec, write_tar_entry, NULL);
 	write_trailer();
 
 	return 0;
diff --git a/archive-zip.c b/archive-zip.c
index 5742762ac3..0d24f3fe37 100644
--- a/archive-zip.c
+++ b/archive-zip.c
@@ -152,9 +152,9 @@ static char *construct_path(const char *base, int baselen,
 	return path;
 }
 
-static int write_zip_entry(const unsigned char *sha1,
-                           const char *base, int baselen,
-                           const char *filename, unsigned mode, int stage)
+static int write_zip_entry(const unsigned char *sha1, const char *base,
+		int baselen, const char *filename, unsigned mode, int stage,
+		void *context)
 {
 	struct zip_local_header header;
 	struct zip_dir_header dirent;
@@ -332,11 +332,12 @@ int write_zip_archive(struct archiver_args *args)
 
 		while (baselen > 0 && base[baselen - 1] == '/')
 			base[--baselen] = '\0';
-		write_zip_entry(args->tree->object.sha1, "", 0, base, 040777, 0);
+		write_zip_entry(args->tree->object.sha1, "", 0, base, 040777,
+				0, NULL);
 		free(base);
 	}
 	read_tree_recursive(args->tree, args->base, plen, 0,
-			    args->pathspec, write_zip_entry);
+			    args->pathspec, write_zip_entry, NULL);
 	write_zip_trailer(args->commit_sha1);
 
 	free(zip_dir);
diff --git a/builtin-checkout.c b/builtin-checkout.c
index d6641c2c56..fbd5105a83 100644
--- a/builtin-checkout.c
+++ b/builtin-checkout.c
@@ -43,7 +43,7 @@ static int post_checkout_hook(struct commit *old, struct commit *new,
 }
 
 static int update_some(const unsigned char *sha1, const char *base, int baselen,
-		       const char *pathname, unsigned mode, int stage)
+		const char *pathname, unsigned mode, int stage, void *context)
 {
 	int len;
 	struct cache_entry *ce;
@@ -67,7 +67,7 @@ static int update_some(const unsigned char *sha1, const char *base, int baselen,
 
 static int read_tree_some(struct tree *tree, const char **pathspec)
 {
-	read_tree_recursive(tree, "", 0, 0, pathspec, update_some);
+	read_tree_recursive(tree, "", 0, 0, pathspec, update_some, NULL);
 
 	/* update the index with the given tree's info
 	 * for all args, expanding wildcards, and exit
diff --git a/builtin-log.c b/builtin-log.c
index 430d87661e..617aa67f2b 100644
--- a/builtin-log.c
+++ b/builtin-log.c
@@ -313,7 +313,7 @@ static int show_object(const unsigned char *sha1, int show_tag_object,
 
 static int show_tree_object(const unsigned char *sha1,
 		const char *base, int baselen,
-		const char *pathname, unsigned mode, int stage)
+		const char *pathname, unsigned mode, int stage, void *context)
 {
 	printf("%s%s\n", pathname, S_ISDIR(mode) ? "/" : "");
 	return 0;
@@ -366,7 +366,7 @@ int cmd_show(int argc, const char **argv, const char *prefix)
 					name,
 					diff_get_color_opt(&rev.diffopt, DIFF_RESET));
 			read_tree_recursive((struct tree *)o, "", 0, 0, NULL,
-					show_tree_object);
+					show_tree_object, NULL);
 			break;
 		case OBJ_COMMIT:
 			rev.pending.nr = rev.pending.alloc = 0;
diff --git a/builtin-ls-tree.c b/builtin-ls-tree.c
index f4a75ddbc3..0da047c3bd 100644
--- a/builtin-ls-tree.c
+++ b/builtin-ls-tree.c
@@ -56,7 +56,7 @@ static int show_recursive(const char *base, int baselen, const char *pathname)
 }
 
 static int show_tree(const unsigned char *sha1, const char *base, int baselen,
-		     const char *pathname, unsigned mode, int stage)
+		const char *pathname, unsigned mode, int stage, void *context)
 {
 	int retval = 0;
 	const char *type = blob_type;
@@ -189,7 +189,7 @@ int cmd_ls_tree(int argc, const char **argv, const char *prefix)
 	tree = parse_tree_indirect(sha1);
 	if (!tree)
 		die("not a tree object");
-	read_tree_recursive(tree, "", 0, 0, pathspec, show_tree);
+	read_tree_recursive(tree, "", 0, 0, pathspec, show_tree, NULL);
 
 	return 0;
 }
diff --git a/builtin-merge-recursive.c b/builtin-merge-recursive.c
index 43bf6aa45e..385e742eef 100644
--- a/builtin-merge-recursive.c
+++ b/builtin-merge-recursive.c
@@ -256,7 +256,7 @@ struct tree *write_tree_from_memory(void)
 
 static int save_files_dirs(const unsigned char *sha1,
 		const char *base, int baselen, const char *path,
-		unsigned int mode, int stage)
+		unsigned int mode, int stage, void *context)
 {
 	int len = strlen(path);
 	char *newpath = xmalloc(baselen + len + 1);
@@ -276,7 +276,7 @@ static int save_files_dirs(const unsigned char *sha1,
 static int get_files_dirs(struct tree *tree)
 {
 	int n;
-	if (read_tree_recursive(tree, "", 0, 0, NULL, save_files_dirs) != 0)
+	if (read_tree_recursive(tree, "", 0, 0, NULL, save_files_dirs, NULL))
 		return 0;
 	n = current_file_set.nr + current_directory_set.nr;
 	return n;
diff --git a/tree.c b/tree.c
index 4b1825c2ad..03e782a9ca 100644
--- a/tree.c
+++ b/tree.c
@@ -29,7 +29,7 @@ static int read_one_entry_opt(const unsigned char *sha1, const char *base, int b
 	return add_cache_entry(ce, opt);
 }
 
-static int read_one_entry(const unsigned char *sha1, const char *base, int baselen, const char *pathname, unsigned mode, int stage)
+static int read_one_entry(const unsigned char *sha1, const char *base, int baselen, const char *pathname, unsigned mode, int stage, void *context)
 {
 	return read_one_entry_opt(sha1, base, baselen, pathname, mode, stage,
 				  ADD_CACHE_OK_TO_ADD|ADD_CACHE_SKIP_DFCHECK);
@@ -39,7 +39,7 @@ static int read_one_entry(const unsigned char *sha1, const char *base, int basel
  * This is used when the caller knows there is no existing entries at
  * the stage that will conflict with the entry being added.
  */
-static int read_one_entry_quick(const unsigned char *sha1, const char *base, int baselen, const char *pathname, unsigned mode, int stage)
+static int read_one_entry_quick(const unsigned char *sha1, const char *base, int baselen, const char *pathname, unsigned mode, int stage, void *context)
 {
 	return read_one_entry_opt(sha1, base, baselen, pathname, mode, stage,
 				  ADD_CACHE_JUST_APPEND);
@@ -92,7 +92,7 @@ static int match_tree_entry(const char *base, int baselen, const char *path, uns
 int read_tree_recursive(struct tree *tree,
 			const char *base, int baselen,
 			int stage, const char **match,
-			read_tree_fn_t fn)
+			read_tree_fn_t fn, void *context)
 {
 	struct tree_desc desc;
 	struct name_entry entry;
@@ -106,7 +106,7 @@ int read_tree_recursive(struct tree *tree,
 		if (!match_tree_entry(base, baselen, entry.path, entry.mode, match))
 			continue;
 
-		switch (fn(entry.sha1, base, baselen, entry.path, entry.mode, stage)) {
+		switch (fn(entry.sha1, base, baselen, entry.path, entry.mode, stage, context)) {
 		case 0:
 			continue;
 		case READ_TREE_RECURSIVE:
@@ -126,7 +126,7 @@ int read_tree_recursive(struct tree *tree,
 			retval = read_tree_recursive(lookup_tree(entry.sha1),
 						     newbase,
 						     baselen + pathlen + 1,
-						     stage, match, fn);
+						     stage, match, fn, context);
 			free(newbase);
 			if (retval)
 				return -1;
@@ -174,7 +174,7 @@ int read_tree(struct tree *tree, int stage, const char **match)
 
 	if (!fn)
 		fn = read_one_entry_quick;
-	err = read_tree_recursive(tree, "", 0, stage, match, fn);
+	err = read_tree_recursive(tree, "", 0, stage, match, fn, NULL);
 	if (fn == read_one_entry || err)
 		return err;
 
diff --git a/tree.h b/tree.h
index dd25c539ef..2ff01a4f83 100644
--- a/tree.h
+++ b/tree.h
@@ -21,12 +21,12 @@ int parse_tree(struct tree *tree);
 struct tree *parse_tree_indirect(const unsigned char *sha1);
 
 #define READ_TREE_RECURSIVE 1
-typedef int (*read_tree_fn_t)(const unsigned char *, const char *, int, const char *, unsigned int, int);
+typedef int (*read_tree_fn_t)(const unsigned char *, const char *, int, const char *, unsigned int, int, void *);
 
 extern int read_tree_recursive(struct tree *tree,
 			       const char *base, int baselen,
 			       int stage, const char **match,
-			       read_tree_fn_t fn);
+			       read_tree_fn_t fn, void *context);
 
 extern int read_tree(struct tree *tree, int stage, const char **paths);