_citrus_ctype_wcrtomb
err = _citrus_ctype_wcrtomb(cc, buf, (wchar_t)wc, (void *)&pspriv, &nr);
err = _citrus_ctype_wcrtomb(cc, buf, *pwcs0, psenc, &siz);
err0 = _citrus_ctype_wcrtomb(_ps_to_ctype(ps, loc), s, wc,