extern size_t utf8_strlen_validate ( char *);
/* from charcnv.c */
+extern int set_charset_name(charset_t, const char *);
extern void init_iconv (void);
extern size_t convert_string (charset_t, charset_t, void const *, size_t, void *, size_t);
extern size_t convert_string_allocate (charset_t, charset_t, void const *, size_t, char **);