+extern int chk_zero(int result, char *msg);
+extern int chk_positive(int result, char *msg);
+extern int chk_non_negative(int result, char *msg);
+
+extern char *trim_end(const char *str, char c);
+extern char *ensure_end(const char *str, char c);
+
+extern void strbuf_ensure_end(struct strbuf *sb, char c);
+
+extern void cgit_add_ref(struct reflist *list, struct refinfo *ref);
+extern void cgit_free_reflist_inner(struct reflist *list);
+extern int cgit_refs_cb(const char *refname, const struct object_id *oid,
+ int flags, void *cb_data);
+
+extern void cgit_free_commitinfo(struct commitinfo *info);
+extern void cgit_free_taginfo(struct taginfo *info);
+
+void cgit_diff_tree_cb(struct diff_queue_struct *q,
+ struct diff_options *options, void *data);
+
+extern int cgit_diff_files(const struct object_id *old_oid,
+ const struct object_id *new_oid,
+ unsigned long *old_size, unsigned long *new_size,
+ int *binary, int context, int ignorews,
+ linediff_fn fn);
+
+extern void cgit_diff_tree(const struct object_id *old_oid,
+ const struct object_id *new_oid,
+ filepair_fn fn, const char *prefix, int ignorews);
+
+extern void cgit_diff_commit(struct commit *commit, filepair_fn fn,
+ const char *prefix);
+
+__attribute__((format (printf,1,2)))