extern int read_ref_at(const char *ref, unsigned long at_time, int cnt, unsigned char *sha1);
/* iterate over reflog entries */
-typedef int each_reflog_ent_fn(unsigned char *osha1, unsigned char *nsha1, char *, void *);
-void for_each_reflog_ent(const char *ref, each_reflog_ent_fn fn, void *cb_data);
+typedef int each_reflog_ent_fn(unsigned char *osha1, unsigned char *nsha1, const char *, unsigned long, int, const char *, void *);
+int for_each_reflog_ent(const char *ref, each_reflog_ent_fn fn, void *cb_data);
/** Returns 0 if target has the right format for a ref. **/
extern int check_ref_format(const char *target);