pack-write: simplify index_pack_lockfile using skip_prefix() and xstrfmt()

Get rid of magic string length constants by using skip_prefix() instead of memcmp() and use xstrfmt() for building a string instead of a PATH_MAX-sized buffer, snprintf() and xstrdup(). Signed-off-by: Rene Scharfe <l.s.r@web.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>

René Scharfe committed Aug 30, 2014 at 11:47 UTC d773144417b1a87b4529144ab0530ecfea103754
1 file changed +5 -6
pack-write.c
+5 -6
@@ -288,13 +288,12 @@ char *index_pack_lockfile(int ip_out)
288 * case, we need it to remove the corresponding .keep file
289 * later on. If we don't get that then tough luck with it.
290 */
291 - if (read_in_full(ip_out, packname, 46) == 46 && packname[45] == '\n' &&
292 - memcmp(packname, "keep\t", 5) == 0) {
293 - char path[PATH_MAX];
291 + if (read_in_full(ip_out, packname, 46) == 46 && packname[45] == '\n') {
292 + const char *name;
293 packname[45] = 0;
295 - snprintf(path, sizeof(path), "%s/pack/pack-%s.keep",
296 - get_object_directory(), packname + 5);
297 - return xstrdup(path);
294 + if (skip_prefix(packname, "keep\t", &name))
295 + return xstrfmt("%s/pack/pack-%s.keep",
296 + get_object_directory(), name);
297 }
298 return NULL;
299 }