if (len < 43 || line[40] != '\t')
                return 1;
 
-       if (!prefixcmp(line + 41, "not-for-merge"))
+       if (starts_with(line + 41, "not-for-merge"))
                return 0;
 
        if (line[41] != '\t')
        if (pulling_head) {
                origin = src;
                src_data->head_status |= 1;
-       } else if (!prefixcmp(line, "branch ")) {
+       } else if (starts_with(line, "branch ")) {
                origin_data->is_local_branch = 1;
                origin = line + 7;
                string_list_append(&src_data->branch, origin);
                src_data->head_status |= 2;
-       } else if (!prefixcmp(line, "tag ")) {
+       } else if (starts_with(line, "tag ")) {
                origin = line;
                string_list_append(&src_data->tag, origin + 4);
                src_data->head_status |= 2;
-       } else if (!prefixcmp(line, "remote-tracking branch ")) {
+       } else if (starts_with(line, "remote-tracking branch ")) {
                origin = line + strlen("remote-tracking branch ");
                string_list_append(&src_data->r_branch, origin);
                src_data->head_status |= 2;
                resolve_refdup("HEAD", head_sha1, 1, NULL);
        if (!current_branch)
                die("No current branch");
-       if (!prefixcmp(current_branch, "refs/heads/"))
+       if (starts_with(current_branch, "refs/heads/"))
                current_branch += 11;
 
        find_merge_parents(&merge_parents, in, head_sha1);