+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)))
+extern char *fmt(const char *format,...);
+
+__attribute__((format (printf,1,2)))
+extern char *fmtalloc(const char *format,...);
+
+extern struct commitinfo *cgit_parse_commit(struct commit *commit);
+extern struct taginfo *cgit_parse_tag(struct tag *tag);
+extern void cgit_parse_url(const char *url);
+
+extern const char *cgit_repobasename(const char *reponame);
+
+extern int cgit_parse_snapshots_mask(const char *str);
+extern const struct object_id *cgit_snapshot_get_sig(const char *ref,
+ const struct cgit_snapshot_format *f);
+extern const unsigned cgit_snapshot_format_bit(const struct cgit_snapshot_format *f);
+
+extern int cgit_open_filter(struct cgit_filter *filter, ...);
+extern int cgit_close_filter(struct cgit_filter *filter);
+extern void cgit_fprintf_filter(struct cgit_filter *filter, FILE *f, const char *prefix);
+extern void cgit_exec_filter_init(struct cgit_exec_filter *filter, char *cmd, char **argv);
+extern struct cgit_filter *cgit_new_filter(const char *cmd, filter_type filtertype);
+extern void cgit_cleanup_filters(void);
+extern void cgit_init_filters(void);
+
+extern void cgit_prepare_repo_env(struct cgit_repo * repo);
+
+extern int readfile(const char *path, char **buf, size_t *size);
+
+extern char *expand_macros(const char *txt);
+
+extern char *get_mimetype_for_filename(const char *filename);