wt-status: move strbuf into read_and_strip_branch()
The strbufs are placed outside read_and_strip_branch as a premature
optimization: when it reads "refs/heads/foo" to strbuf and wants to
return just "foo", it could do so without memory movement. In return
the caller must not use the returned pointer after releasing strbufs,
which own the buffers that contain the returned strings. It's a clumsy
design.
By moving strbufs into read_and_strip_branch(), the returned pointer
always points to a malloc'd buffer or NULL. The pointer can be passed
around and freed after use.
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/wt-status.c b/wt-status.c
index 983e2f4..aa53436 100644
--- a/wt-status.c
+++ b/wt-status.c
@@ -967,41 +967,41 @@
/*
* Extract branch information from rebase/bisect
*/
-static void read_and_strip_branch(struct strbuf *sb,
- const char **branch,
- const char *path)
+static char *read_and_strip_branch(const char *path)
{
+ struct strbuf sb = STRBUF_INIT;
unsigned char sha1[20];
- strbuf_reset(sb);
- if (strbuf_read_file(sb, git_path("%s", path), 0) <= 0)
- return;
+ if (strbuf_read_file(&sb, git_path("%s", path), 0) <= 0)
+ goto got_nothing;
- while (sb->len && sb->buf[sb->len - 1] == '\n')
- strbuf_setlen(sb, sb->len - 1);
- if (!sb->len)
- return;
- if (!prefixcmp(sb->buf, "refs/heads/"))
- *branch = sb->buf + strlen("refs/heads/");
- else if (!prefixcmp(sb->buf, "refs/"))
- *branch = sb->buf;
- else if (!get_sha1_hex(sb->buf, sha1)) {
+ while (&sb.len && sb.buf[sb.len - 1] == '\n')
+ strbuf_setlen(&sb, sb.len - 1);
+ if (!sb.len)
+ goto got_nothing;
+ if (!prefixcmp(sb.buf, "refs/heads/"))
+ strbuf_remove(&sb,0, strlen("refs/heads/"));
+ else if (!prefixcmp(sb.buf, "refs/"))
+ ;
+ else if (!get_sha1_hex(sb.buf, sha1)) {
const char *abbrev;
abbrev = find_unique_abbrev(sha1, DEFAULT_ABBREV);
- strbuf_reset(sb);
- strbuf_addstr(sb, abbrev);
- *branch = sb->buf;
- } else if (!strcmp(sb->buf, "detached HEAD")) /* rebase */
- ;
+ strbuf_reset(&sb);
+ strbuf_addstr(&sb, abbrev);
+ } else if (!strcmp(sb.buf, "detached HEAD")) /* rebase */
+ goto got_nothing;
else /* bisect */
- *branch = sb->buf;
+ ;
+ return strbuf_detach(&sb, NULL);
+
+got_nothing:
+ strbuf_release(&sb);
+ return NULL;
}
static void wt_status_print_state(struct wt_status *s)
{
const char *state_color = color(WT_STATUS_HEADER, s);
- struct strbuf branch = STRBUF_INIT;
- struct strbuf onto = STRBUF_INIT;
struct wt_status_state state;
struct stat st;
@@ -1016,27 +1016,22 @@
state.am_empty_patch = 1;
} else {
state.rebase_in_progress = 1;
- read_and_strip_branch(&branch, &state.branch,
- "rebase-apply/head-name");
- read_and_strip_branch(&onto, &state.onto,
- "rebase-apply/onto");
+ state.branch = read_and_strip_branch("rebase-apply/head-name");
+ state.onto = read_and_strip_branch("rebase-apply/onto");
}
} else if (!stat(git_path("rebase-merge"), &st)) {
if (!stat(git_path("rebase-merge/interactive"), &st))
state.rebase_interactive_in_progress = 1;
else
state.rebase_in_progress = 1;
- read_and_strip_branch(&branch, &state.branch,
- "rebase-merge/head-name");
- read_and_strip_branch(&onto, &state.onto,
- "rebase-merge/onto");
+ state.branch = read_and_strip_branch("rebase-merge/head-name");
+ state.onto = read_and_strip_branch("rebase-merge/onto");
} else if (!stat(git_path("CHERRY_PICK_HEAD"), &st)) {
state.cherry_pick_in_progress = 1;
}
if (!stat(git_path("BISECT_LOG"), &st)) {
state.bisect_in_progress = 1;
- read_and_strip_branch(&branch, &state.branch,
- "BISECT_START");
+ state.branch = read_and_strip_branch("BISECT_START");
}
if (state.merge_in_progress)
@@ -1049,8 +1044,8 @@
show_cherry_pick_in_progress(s, &state, state_color);
if (state.bisect_in_progress)
show_bisect_in_progress(s, &state, state_color);
- strbuf_release(&branch);
- strbuf_release(&onto);
+ free(state.branch);
+ free(state.onto);
}
void wt_status_print(struct wt_status *s)
