-char * recode_string (const char *to, const char *from,
- const char *text, int len);
+struct pool;
+
+char recode_byte (const char *to, const char *from, char);
+
+char *recode_string (const char *to, const char *from,
+ const char *text, int len);
+char *recode_string_pool (const char *to, const char *from,
+ const char *text, int length, struct pool *);
+struct substring recode_substring_pool (const char *to, const char *from,
+ struct substring text, struct pool *);