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authorJeff King <peff@peff.net>2013-04-05 21:15:50 (GMT)
committerJunio C Hamano <gitster@pobox.com>2013-04-07 01:57:15 (GMT)
commitaaa07e3eee6f42d0adeac826dfb52d5ade26defc (patch)
tree0a188f1f8321dce9fe433eba70b8598669a4f77d /builtin/show-branch.c
parent15999998fbda60552742275570947431b57108ae (diff)
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show-branch: use strbuf instead of static buffer
When we generate relative names (e.g., "master~20^2"), we format the name into a static buffer, then xstrdup the result to attach it to the commit. Since the first thing we add into the static buffer is the already-computed name of the child commit, the names may get longer and longer as the traversal gets deeper, and we may eventually overflow the fixed-size buffer. Fix this by converting the fixed-size buffer into a dynamic strbuf. The performance implications should be minimal, as we end up allocating a heap copy of the name anyway (and now we can just detach the heap copy from the strbuf). Reported-by: Eric Roman <eroman@chromium.org> Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'builtin/show-branch.c')
-rw-r--r--builtin/show-branch.c17
1 files changed, 8 insertions, 9 deletions
diff --git a/builtin/show-branch.c b/builtin/show-branch.c
index d208fd6..90fc6b1 100644
--- a/builtin/show-branch.c
+++ b/builtin/show-branch.c
@@ -162,29 +162,28 @@ static void name_commits(struct commit_list *list,
nth = 0;
while (parents) {
struct commit *p = parents->item;
- char newname[1000], *en;
+ struct strbuf newname = STRBUF_INIT;
parents = parents->next;
nth++;
if (p->util)
continue;
- en = newname;
switch (n->generation) {
case 0:
- en += sprintf(en, "%s", n->head_name);
+ strbuf_addstr(&newname, n->head_name);
break;
case 1:
- en += sprintf(en, "%s^", n->head_name);
+ strbuf_addf(&newname, "%s^", n->head_name);
break;
default:
- en += sprintf(en, "%s~%d",
- n->head_name, n->generation);
+ strbuf_addf(&newname, "%s~%d",
+ n->head_name, n->generation);
break;
}
if (nth == 1)
- en += sprintf(en, "^");
+ strbuf_addch(&newname, '^');
else
- en += sprintf(en, "^%d", nth);
- name_commit(p, xstrdup(newname), 0);
+ strbuf_addf(&newname, "^%d", nth);
+ name_commit(p, strbuf_detach(&newname, NULL), 0);
i++;
name_first_parent_chain(p);
}