tree-walk: add a strbuf wrapper for make_traverse_path()
All but one of the callers of make_traverse_path() allocate a new heap
buffer to store the path. Let's give them an easy way to write to a
strbuf, which saves them from computing the length themselves (which is
especially tricky when they want to add to the path). It will also make
it easier for us to change the make_traverse_path() interface in a
future patch to improve its bounds-checking.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/Documentation/technical/api-tree-walking.txt b/Documentation/technical/api-tree-walking.txt
index 59d78e0..7962e32 100644
--- a/Documentation/technical/api-tree-walking.txt
+++ b/Documentation/technical/api-tree-walking.txt
@@ -138,6 +138,10 @@
This utilizes the memory structure of a tree entry to avoid the
overhead of using a generic strlen().
+`strbuf_make_traverse_path`::
+
+ Convenience wrapper to `make_traverse_path` into a strbuf.
+
Authors
-------
diff --git a/builtin/merge-tree.c b/builtin/merge-tree.c
index 0629c87..87d949c 100644
--- a/builtin/merge-tree.c
+++ b/builtin/merge-tree.c
@@ -180,8 +180,9 @@
static char *traverse_path(const struct traverse_info *info, const struct name_entry *n)
{
- char *path = xmallocz(traverse_path_len(info, tree_entry_len(n)));
- return make_traverse_path(path, info, n->path, n->pathlen);
+ struct strbuf buf = STRBUF_INIT;
+ strbuf_make_traverse_path(&buf, info, n->path, n->pathlen);
+ return strbuf_detach(&buf, NULL);
}
static void resolve(const struct traverse_info *info, struct name_entry *ours, struct name_entry *result)
diff --git a/tree-walk.c b/tree-walk.c
index 70f9eb5..c2952f3 100644
--- a/tree-walk.c
+++ b/tree-walk.c
@@ -200,6 +200,17 @@
return path;
}
+void strbuf_make_traverse_path(struct strbuf *out,
+ const struct traverse_info *info,
+ const char *name, size_t namelen)
+{
+ size_t len = traverse_path_len(info, namelen);
+
+ strbuf_grow(out, len);
+ make_traverse_path(out->buf + out->len, info, name, namelen);
+ strbuf_setlen(out, out->len + len);
+}
+
struct tree_desc_skip {
struct tree_desc_skip *prev;
const void *ptr;
@@ -396,12 +407,10 @@
tx[i].d = t[i];
if (info->prev) {
- strbuf_grow(&base, info->pathlen);
- make_traverse_path(base.buf, info->prev, info->name,
- info->namelen);
- base.buf[info->pathlen-1] = '/';
- strbuf_setlen(&base, info->pathlen);
- traverse_path = xstrndup(base.buf, info->pathlen);
+ strbuf_make_traverse_path(&base, info->prev,
+ info->name, info->namelen);
+ strbuf_addch(&base, '/');
+ traverse_path = xstrndup(base.buf, base.len);
} else {
traverse_path = xstrndup(info->name, info->pathlen);
}
diff --git a/tree-walk.h b/tree-walk.h
index a25c751..994c14a 100644
--- a/tree-walk.h
+++ b/tree-walk.h
@@ -72,6 +72,9 @@
int get_tree_entry(const struct object_id *, const char *, struct object_id *, unsigned short *);
char *make_traverse_path(char *path, const struct traverse_info *info,
const char *name, size_t namelen);
+void strbuf_make_traverse_path(struct strbuf *out,
+ const struct traverse_info *info,
+ const char *name, size_t namelen);
void setup_traverse_info(struct traverse_info *info, const char *base);
static inline size_t traverse_path_len(const struct traverse_info *info,
diff --git a/unpack-trees.c b/unpack-trees.c
index 492eff6..c3059c2 100644
--- a/unpack-trees.c
+++ b/unpack-trees.c
@@ -686,21 +686,19 @@
struct traverse_info *info)
{
struct unpack_trees_options *o = info->data;
- size_t len = traverse_path_len(info, tree_entry_len(names));
- char *name = xmalloc(len + 1 /* slash */ + 1 /* NUL */);
+ struct strbuf name = STRBUF_INIT;
int pos;
- make_traverse_path(name, info, names->path, names->pathlen);
- name[len++] = '/';
- name[len] = '\0';
- pos = index_name_pos(o->src_index, name, len);
+ strbuf_make_traverse_path(&name, info, names->path, names->pathlen);
+ strbuf_addch(&name, '/');
+ pos = index_name_pos(o->src_index, name.buf, name.len);
if (pos >= 0)
BUG("This is a directory and should not exist in index");
pos = -pos - 1;
- if (!starts_with(o->src_index->cache[pos]->name, name) ||
- (pos > 0 && starts_with(o->src_index->cache[pos-1]->name, name)))
+ if (!starts_with(o->src_index->cache[pos]->name, name.buf) ||
+ (pos > 0 && starts_with(o->src_index->cache[pos-1]->name, name.buf)))
BUG("pos must point at the first entry in this directory");
- free(name);
+ strbuf_release(&name);
return pos;
}
