wcrtomb
size_t wcrtomb(char * __restrict, wchar_t, mbstate_t * __restrict);
clen = wcrtomb(buf, *str, &mbs);
clen = wcrtomb(mbdst, *dst, &mbstate);
ps = &locale->wcrtomb;
__mbstate_t wcrtomb;
clen = wcrtomb(buf, *p++, &mbs);
mbseqlen = wcrtomb(cp = buf,
if ((len = wcrtomb(buf, wc, &mbs)) == (size_t)-1) {
nconv = wcrtomb(mbp, wi, &mbs);
nconv = wcrtomb(mbp, wi, &mbs);
nconv = wcrtomb(mbp, wi, &mbs);
mbseqlen = wcrtomb(buf, (wchar_t)ii, &mbs);
clen = wcrtomb(buf, *p++, &mbs);
len = wcrtomb(buf, ch, NULL);