show_object(): push path_name() call further down

In particular, pushing the "path_name()" call _into_ the show() function
would seem to allow

 - more clarity into who "owns" the name (ie now when we free the name in
   the show_object callback, it's because we generated it ourselves by
   calling path_name())

 - not calling path_name() at all, either because we don't care about the
   name in the first place, or because we are actually happy walking the
   linked list of "struct name_path *" and the last component.

Now, I didn't do that latter optimization, because it would require some
more coding, but especially looking at "builtin-pack-objects.c", we really
don't even want the whole pathname, we really would be better off with the
list of path components.

Why? We use that name for two things:
 - add_preferred_base_object(), which actually _wants_ to traverse the
   path, and now does it by looking for '/' characters!
 - for 'name_hash()', which only cares about the last 16 characters of a
   name, so again, generating the full name seems to be just unnecessary
   work.

Anyway, so I didn't look any closer at those things, but it did convince
me that the "show_object()" calling convention was crazy, and we're
actually better off doing _less_ in list-objects.c, and giving people
access to the internal data structures so that they can decide whether
they want to generate a path-name or not.

This patch does that, and then for people who did use the name (even if
they might do something more clever in the future), it just does the
straightforward "name = path_name(path, component); .. free(name);" thing.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

7 files changed, 20 insertions, 14 deletions

diff --git a/builtin-pack-objects.c b/builtin-pack-objects.c
index dde8cc3f01..71041453f2 100644
--- a/builtin-pack-objects.c
+++ b/builtin-pack-objects.c
@@ -1856,8 +1856,10 @@ static void show_commit(struct commit *commit)
 	commit->object.flags |= OBJECT_ADDED;
 }
 
-static void show_object(struct object *obj, const char *name)
+static void show_object(struct object *obj, const struct name_path *path, const char *last)
 {
+	char *name = path_name(path, last);
+
 	add_preferred_base_object(name);
 	add_object_entry(obj->sha1, obj->type, name, 0);
 	obj->flags |= OBJECT_ADDED;
diff --git a/builtin-rev-list.c b/builtin-rev-list.c
index 759e6714ce..aa3c962e56 100644
--- a/builtin-rev-list.c
+++ b/builtin-rev-list.c
@@ -169,20 +169,21 @@ static void finish_commit(struct commit *commit)
 	commit->buffer = NULL;
 }
 
-static void finish_object(struct object *obj, const char *name)
+static void finish_object(struct object *obj, const struct name_path *path, const char *name)
 {
 	if (obj->type == OBJ_BLOB && !has_sha1_file(obj->sha1))
 		die("missing blob object '%s'", sha1_to_hex(obj->sha1));
 }
 
-static void show_object(struct object *obj, const char *name)
+static void show_object(struct object *obj, const struct name_path *path, const char *component)
 {
+	char *name = path_name(path, component);
 	/* An object with name "foo\n0000000..." can be used to
 	 * confuse downstream "git pack-objects" very badly.
 	 */
 	const char *ep = strchr(name, '\n');
 
-	finish_object(obj, name);
+	finish_object(obj, path, name);
 	if (ep) {
 		printf("%s %.*s\n", sha1_to_hex(obj->sha1),
 		       (int) (ep - name),
@@ -190,6 +191,7 @@ static void show_object(struct object *obj, const char *name)
 	}
 	else
 		printf("%s %s\n", sha1_to_hex(obj->sha1), name);
+	free(name);
 }
 
 static void show_edge(struct commit *commit)
diff --git a/list-objects.c b/list-objects.c
index 5a4af62bdc..30ded3d4dd 100644
--- a/list-objects.c
+++ b/list-objects.c
@@ -23,7 +23,7 @@ static void process_blob(struct rev_info *revs,
 	if (obj->flags & (UNINTERESTING | SEEN))
 		return;
 	obj->flags |= SEEN;
-	show(obj, path_name(path, name));
+	show(obj, path, name);
 }
 
 /*
@@ -77,7 +77,7 @@ static void process_tree(struct rev_info *revs,
 	if (parse_tree(tree) < 0)
 		die("bad tree object %s", sha1_to_hex(obj->sha1));
 	obj->flags |= SEEN;
-	show(obj, path_name(path, name));
+	show(obj, path, name);
 	me.up = path;
 	me.elem = name;
 	me.elem_len = strlen(name);
@@ -140,8 +140,8 @@ static void add_pending_tree(struct rev_info *revs, struct tree *tree)
 }
 
 void traverse_commit_list(struct rev_info *revs,
-			  void (*show_commit)(struct commit *),
-			  void (*show_object)(struct object *, const char *))
+			  show_commit_fn show_commit,
+			  show_object_fn show_object)
 {
 	int i;
 	struct commit *commit;
@@ -158,7 +158,7 @@ void traverse_commit_list(struct rev_info *revs,
 			continue;
 		if (obj->type == OBJ_TAG) {
 			obj->flags |= SEEN;
-			show_object(obj, name);
+			show_object(obj, NULL, name);
 			continue;
 		}
 		if (obj->type == OBJ_TREE) {
diff --git a/list-objects.h b/list-objects.h
index 13b0dd998e..0b2de64301 100644
--- a/list-objects.h
+++ b/list-objects.h
@@ -2,7 +2,7 @@
 #define LIST_OBJECTS_H
 
 typedef void (*show_commit_fn)(struct commit *);
-typedef void (*show_object_fn)(struct object *, const char *);
+typedef void (*show_object_fn)(struct object *, const struct name_path *, const char *);
 typedef void (*show_edge_fn)(struct commit *);
 
 void traverse_commit_list(struct rev_info *revs, show_commit_fn, show_object_fn);
diff --git a/revision.c b/revision.c
index f95104b080..69d5fd4784 100644
--- a/revision.c
+++ b/revision.c
@@ -14,9 +14,9 @@
 
 volatile show_early_output_fn_t show_early_output;
 
-char *path_name(struct name_path *path, const char *name)
+char *path_name(const struct name_path *path, const char *name)
 {
-	struct name_path *p;
+	const struct name_path *p;
 	char *n, *m;
 	int nlen = strlen(name);
 	int len = nlen + 1;
diff --git a/revision.h b/revision.h
index 6fcfb8ce0c..e5b8908fde 100644
--- a/revision.h
+++ b/revision.h
@@ -141,7 +141,7 @@ struct name_path {
 	const char *elem;
 };
 
-char *path_name(struct name_path *path, const char *name);
+char *path_name(const struct name_path *path, const char *name);
 
 extern void add_object(struct object *obj,
 		       struct object_array *p,
diff --git a/upload-pack.c b/upload-pack.c
index bdbd67bc1d..d8ce30654b 100644
--- a/upload-pack.c
+++ b/upload-pack.c
@@ -78,11 +78,12 @@ static void show_commit(struct commit *commit)
 	commit->buffer = NULL;
 }
 
-static void show_object(struct object *obj, const char *name)
+static void show_object(struct object *obj, const struct name_path *path, const char *component)
 {
 	/* An object with name "foo\n0000000..." can be used to
 	 * confuse downstream git-pack-objects very badly.
 	 */
+	const char *name = path_name(path, component);
 	const char *ep = strchr(name, '\n');
 	if (ep) {
 		fprintf(pack_pipe, "%s %.*s\n", sha1_to_hex(obj->sha1),
@@ -92,6 +93,7 @@ static void show_object(struct object *obj, const char *name)
 	else
 		fprintf(pack_pipe, "%s %s\n",
 				sha1_to_hex(obj->sha1), name);
+	free((char *)name);
 }
 
 static void show_edge(struct commit *commit)