transport: use strbufs for status table "quickref" strings
authorJeff King <peff@peff.net>
Thu, 24 Sep 2015 21:07:40 +0000 (17:07 -0400)
committerJunio C Hamano <gitster@pobox.com>
Mon, 5 Oct 2015 18:08:04 +0000 (11:08 -0700)
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>
builtin/fetch.c
transport.c

index 4703725..841880e 100644 (file)
@@ -528,36 +528,38 @@ static int update_local_ref(struct ref *ref,
        }
 
        if (in_merge_bases(current, updated)) {
        }
 
        if (in_merge_bases(current, updated)) {
-               char quickref[83];
+               struct strbuf quickref = STRBUF_INIT;
                int r;
                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 ? '!' : ' ',
                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)") : "");
                            REFCOL_WIDTH, remote, pretty_ref,
                            r ? _("  (unable to update local ref)") : "");
+               strbuf_release(&quickref);
                return r;
        } else if (force || ref->force) {
                return r;
        } else if (force || ref->force) {
-               char quickref[84];
+               struct strbuf quickref = STRBUF_INIT;
                int r;
                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 ? '!' : '+',
                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"));
                            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",
                return r;
        } else {
                strbuf_addf(display, "! %-*s %-*s -> %s  %s",
index 2d51348..3b47d49 100644 (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 {
                        "[new branch]"),
                        ref, ref->peer_ref, NULL, porcelain);
        else {
-               char quickref[84];
+               struct strbuf quickref = STRBUF_INIT;
                char type;
                const char *msg;
 
                char type;
                const char *msg;
 
-               strcpy(quickref, status_abbrev(ref->old_sha1));
+               strbuf_addstr(&quickref, status_abbrev(ref->old_sha1));
                if (ref->forced_update) {
                if (ref->forced_update) {
-                       strcat(quickref, "...");
+                       strbuf_addstr(&quickref, "...");
                        type = '+';
                        msg = "forced update";
                } else {
                        type = '+';
                        msg = "forced update";
                } else {
-                       strcat(quickref, "..");
+                       strbuf_addstr(&quickref, "..");
                        type = ' ';
                        msg = NULL;
                }
                        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);
        }
 }
 
        }
 }