iswcntrl.c

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#include <wctype.h>

int iswcntrl(wint_t wc)
{
    return (unsigned)wc < 32 || (unsigned)(wc - 0x7f) < 33 || (unsigned)(wc - 0x2028) < 2 ||
           (unsigned)(wc - 0xfff9) < 3;
}