extern char *get_id_string(struct id_element *ids, int id);
extern char *get_id_string(struct id_element *ids, int id, char *def);
extern int get_string_id(struct id_element *ids, char *str);
extern int get_string_id(struct id_element *ids, char *str, int def);
extern char *format_string(char *format, ...);
extern char *get_id_string(struct id_element *ids, int id);
extern char *get_id_string(struct id_element *ids, int id, char *def);
extern int get_string_id(struct id_element *ids, char *str);
extern int get_string_id(struct id_element *ids, char *str, int def);
extern char *format_string(char *format, ...);