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transport: use strbufs for status table "quickref" strings 

We generate range strings like "1234abcd...5678efab" for use
in the the fetch and push status tables. We use fixed-size
buffers along with strcat to do so. These aren't buggy, as
our manual size computation is correct, but there's nothing
checking that this is so.  Let's switch them to strbufs
instead, which are obviously correct, and make it easier to
audit the code base for problematic calls to strcat().

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King 2015-09-24 17:07:40 -04:00 committed by Junio C Hamano
parent 6c31c22ceb
commit bd22d4ffbc
2 changed files with 19 additions and 16 deletions
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22
builtin/fetch.c
View File

@ -528,36 +528,38 @@ static int update_local_ref(struct ref *ref,
}
if (in_merge_bases(current, updated)) {
char quickref[83];
struct strbuf quickref = STRBUF_INIT;
int r;
strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
strcat(quickref, "..");
strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
strbuf_add_unique_abbrev(&quickref, current->object.sha1, DEFAULT_ABBREV);
strbuf_addstr(&quickref, "..");
strbuf_add_unique_abbrev(&quickref, ref->new_sha1, DEFAULT_ABBREV);
if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
(recurse_submodules != RECURSE_SUBMODULES_ON))
check_for_new_submodule_commits(ref->new_sha1);
r = s_update_ref("fast-forward", ref, 1);
strbuf_addf(display, "%c %-*s %-*s -> %s%s",
r ? '!' : ' ',
TRANSPORT_SUMMARY_WIDTH, quickref,
TRANSPORT_SUMMARY_WIDTH, quickref.buf,
REFCOL_WIDTH, remote, pretty_ref,
r ? _(" (unable to update local ref)") : "");
strbuf_release(&quickref);
return r;
} else if (force || ref->force) {
char quickref[84];
struct strbuf quickref = STRBUF_INIT;
int r;
strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
strcat(quickref, "...");
strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
strbuf_add_unique_abbrev(&quickref, current->object.sha1, DEFAULT_ABBREV);
strbuf_addstr(&quickref, "...");
strbuf_add_unique_abbrev(&quickref, ref->new_sha1, DEFAULT_ABBREV);
if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
(recurse_submodules != RECURSE_SUBMODULES_ON))
check_for_new_submodule_commits(ref->new_sha1);
r = s_update_ref("forced-update", ref, 1);
strbuf_addf(display, "%c %-*s %-*s -> %s (%s)",
r ? '!' : '+',
TRANSPORT_SUMMARY_WIDTH, quickref,
TRANSPORT_SUMMARY_WIDTH, quickref.buf,
REFCOL_WIDTH, remote, pretty_ref,
r ? _("unable to update local ref") : _("forced update"));
strbuf_release(&quickref);
return r;
} else {
strbuf_addf(display, "! %-*s %-*s -> %s %s",

13
transport.c
View File

@ -654,23 +654,24 @@ static void print_ok_ref_status(struct ref *ref, int porcelain)
"[new branch]"),
ref, ref->peer_ref, NULL, porcelain);
else {
char quickref[84];
struct strbuf quickref = STRBUF_INIT;
char type;
const char *msg;
strcpy(quickref, status_abbrev(ref->old_sha1));
strbuf_addstr(&quickref, status_abbrev(ref->old_sha1));
if (ref->forced_update) {
strcat(quickref, "...");
strbuf_addstr(&quickref, "...");
type = '+';
msg = "forced update";
} else {
strcat(quickref, "..");
strbuf_addstr(&quickref, "..");
type = ' ';
msg = NULL;
}
strcat(quickref, status_abbrev(ref->new_sha1));
strbuf_addstr(&quickref, status_abbrev(ref->new_sha1));
print_ref_status(type, quickref, ref, ref->peer_ref, msg, porcelain);
print_ref_status(type, quickref.buf, ref, ref->peer_ref, msg, porcelain);
strbuf_release(&quickref);
}
}