+static int check_ref_format_branch(const char *arg)
+{
+ struct strbuf sb = STRBUF_INIT;
+ int nongit;
+
+ setup_git_directory_gently(&nongit);
+ if (strbuf_check_branch_ref(&sb, arg))
+ die("'%s' is not a valid branch name", arg);
+ printf("%s\n", sb.buf + 11);
+ return 0;
+}
+
+static int check_ref_format_print(const char *arg)
+{
+ char *refname = xmalloc(strlen(arg) + 1);
+
+ if (check_ref_format(arg))
+ return 1;
+ collapse_slashes(refname, arg);
+ printf("%s\n", refname);
+ return 0;
+}
+