+struct warn_if_dangling_data {
+ const char *refname;
+ const char *msg_fmt;
+};
+
+static int warn_if_dangling_symref(const char *refname, const unsigned char *sha1,
+ int flags, void *cb_data)
+{
+ struct warn_if_dangling_data *d = cb_data;
+ const char *resolves_to;
+ unsigned char junk[20];
+
+ if (!(flags & REF_ISSYMREF))
+ return 0;
+
+ resolves_to = resolve_ref(refname, junk, 0, NULL);
+ if (!resolves_to || strcmp(resolves_to, d->refname))
+ return 0;
+
+ printf(d->msg_fmt, refname);
+ return 0;
+}
+
+void warn_dangling_symref(const char *msg_fmt, const char *refname)
+{
+ struct warn_if_dangling_data data = { refname, msg_fmt };
+ for_each_rawref(warn_if_dangling_symref, &data);
+}
+