implement mbtowc directly, not as a wrapper for mbrtowc

[musl] / src / multibyte / mbstowcs.c

#include <stdlib.h>
#include <wchar.h>

size_t mbstowcs(wchar_t *restrict ws, const char *restrict s, size_t wn)
{
        return mbsrtowcs(ws, (void*)&s, wn, 0);
}