mbrtowc_l
size_t mbrtowc_l(wchar_t * __restrict, const char * __restrict, size_t,
wc_len = mbrtowc_l(&wc, buf, len, &mbrtowcstate, loc);
len = mbrtowc_l(&wc, s, n, ps, loc);
return mbrtowc_l(pwc, s, n, ps, _current_locale());
nconv = mbrtowc_l(wcp, buf, n, &mbs,
nconv = mbrtowc_l(wcp, buf, n, &mbs,
nconv = mbrtowc_l(wcp, buf, n, &mbs,
nconv = mbrtowc_l(wcp, p, insize, &mbs, loc);