iswalpha.c

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#include <wctype.h>

static const unsigned char table[] = {
#include "alpha.h"
};

int iswalpha(wint_t wc)
{
    if(wc < 0x20000U)
    {
        return (table[table[wc >> 8] * 32 + ((wc & 255) >> 3)] >> (wc & 7)) & 1;
    }
    if(wc < 0x2fffeU)
    {
        return 1;
    }
    return 0;
}