size_t wcrtomb (char *s, wchar_t wc, mbstate_t *ps);
size_t mbrtowc (wchar_t *pwc, const char *s, size_t n, mbstate_t *ps);
int iswprint (wint_t wc);
size_t wcrtomb (char *s, wchar_t wc, mbstate_t *ps);
size_t mbrtowc (wchar_t *pwc, const char *s, size_t n, mbstate_t *ps);
int iswprint (wint_t wc);