receive-pack: simplify keep_arg computation
authorJeff King <peff@peff.net>
Thu, 24 Sep 2015 21:08:14 +0000 (17:08 -0400)
committerJunio C Hamano <gitster@pobox.com>
Mon, 5 Oct 2015 18:08:05 +0000 (11:08 -0700)
To generate "--keep=receive-pack $pid on $host", we write
progressively into a single buffer, which requires keeping
track of how much we've written so far. But since the result
is destined to go into our argv array, we can simply use
argv_array_pushf.

Unfortunately we still have to have a fixed-size buffer for
the gethostname() call, but at least it now doesn't involve
any extra size computation. And as a bonus, we drop an
sprintf and a strcpy call.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
builtin/receive-pack.c

index 39eb064..bcb624b 100644 (file)
@@ -1524,15 +1524,18 @@ static const char *unpack(int err_fd, struct shallow_info *si)
                if (status)
                        return "unpack-objects abnormal exit";
        } else {
-               int s;
-               char keep_arg[256];
-
-               s = sprintf(keep_arg, "--keep=receive-pack %"PRIuMAX" on ", (uintmax_t) getpid());
-               if (gethostname(keep_arg + s, sizeof(keep_arg) - s))
-                       strcpy(keep_arg + s, "localhost");
+               char hostname[256];
 
                argv_array_pushl(&child.args, "index-pack",
-                                "--stdin", hdr_arg, keep_arg, NULL);
+                                "--stdin", hdr_arg, NULL);
+
+               if (gethostname(hostname, sizeof(hostname)))
+                       xsnprintf(hostname, sizeof(hostname), "localhost");
+               argv_array_pushf(&child.args,
+                                "--keep=receive-pack %"PRIuMAX" on %s",
+                                (uintmax_t)getpid(),
+                                hostname);
+
                if (fsck_objects)
                        argv_array_pushf(&child.args, "--strict%s",
                                fsck_msg_types.buf);