From 8b87cfd000c7c98f58279cff698f6e8c7892c059 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Nguy=E1=BB=85n=20Th=C3=A1i=20Ng=E1=BB=8Dc=20Duy?= Date: Sat, 16 Mar 2013 09:12:36 +0700 Subject: [PATCH] wt-status: move strbuf into read_and_strip_branch() MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Signed-off-by: Junio C Hamano --- wt-status.c | 65 ++++++++++++++++++++++++++++--------------------------------- wt-status.h | 4 ++-- 2 files changed, 32 insertions(+), 37 deletions(-) diff --git a/wt-status.c b/wt-status.c index 983e2f4b5e..aa53436118 100644 --- a/wt-status.c +++ b/wt-status.c @@ -967,41 +967,41 @@ static void show_bisect_in_progress(struct wt_status *s, /* * 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 @@ static void wt_status_print_state(struct wt_status *s) 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 @@ static void wt_status_print_state(struct wt_status *s) 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) diff --git a/wt-status.h b/wt-status.h index 81e1dcf84d..b8c3512903 100644 --- a/wt-status.h +++ b/wt-status.h @@ -79,8 +79,8 @@ struct wt_status_state { int rebase_interactive_in_progress; int cherry_pick_in_progress; int bisect_in_progress; - const char *branch; - const char *onto; + char *branch; + char *onto; }; void wt_status_prepare(struct wt_status *s); -- 2.11.4.GIT