4 size_t mbrtoc32(char32_t *restrict pc32, const char *restrict s, size_t n, mbstate_t *restrict ps)
6 static unsigned internal_state;
7 if (!ps) ps = (void *)&internal_state;
8 if (!s) return mbrtoc32(0, "", 1, ps);
10 size_t ret = mbrtowc(&wc, s, n, ps);
11 if (ret <= 4 && pc32) *pc32 = wc;