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#include <uchar.h>
#include <wchar.h>
size_t mbrtoc32(char32_t *restrict pc32, const char *restrict s, size_t n, mbstate_t *restrict ps)
{
static unsigned internal_state;
if (!ps) ps = (void *)&internal_state;
if (!s) return mbrtoc32(0, "", 1, ps);
wchar_t wc;
size_t ret = mbrtowc(&wc, s, n, ps);
if (ret <= 4 && pc32) *pc32 = wc;
return ret;
}
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