use skip_prefix to avoid magic numbers

diff --git a/fetch-pack.c b/fetch-pack.c
index eeee2bb7e08a21dfe091a30c8378da6d488228f5..3de3bd508e2199cb39ad0fac9e955a9e28bef93b 100644 (file)
--- a/fetch-pack.c
+++ b/fetch-pack.c
@@ -319,18 +319,19 @@ static int find_common(struct fetch_pack_args *args,
 
        if (args->depth > 0) {
                char *line;
+               const char *arg;
                unsigned char sha1[20];
 
                send_request(args, fd[1], &req_buf);
                while ((line = packet_read_line(fd[0], NULL))) {
-                       if (starts_with(line, "shallow ")) {
-                               if (get_sha1_hex(line + 8, sha1))
+                       if (skip_prefix(line, "shallow ", &arg)) {
+                               if (get_sha1_hex(arg, sha1))
                                        die("invalid shallow line: %s", line);
                                register_shallow(sha1);
                                continue;
                        }
-                       if (starts_with(line, "unshallow ")) {
-                               if (get_sha1_hex(line + 10, sha1))
+                       if (skip_prefix(line, "unshallow ", &arg)) {
+                               if (get_sha1_hex(arg, sha1))
                                        die("invalid unshallow line: %s", line);
                                if (!lookup_object(sha1))
                                        die("object not found: %s", line);