struct ref *alloc_ref(const char *name);
struct ref *copy_ref(const struct ref *ref);
struct ref *copy_ref_list(const struct ref *ref);
-void sort_ref_list(struct ref **, int (*cmp)(const void *, const void *));
int count_refspec_match(const char *, struct ref *refs, struct ref **matched_ref);
-int ref_compare_name(const void *, const void *);
int check_ref_type(const struct ref *ref, int flags);