-void *chars_init(enum chars);
-const char *chars_num2char(const char *, size_t);
-const char *chars_spec2str(void *, const char *, size_t, size_t *);
-int chars_spec2cp(void *, const char *, size_t);
-const char *chars_res2str(void *, const char *, size_t, size_t *);
-int chars_res2cp(void *, const char *, size_t);
-void chars_free(void *);
-