wcwidth.c

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#include <wchar.h>

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

static const unsigned char wtable[] = {
#include "wide.h"
};

int wcwidth(wchar_t wc)
{
    if(wc < (wchar_t)0xffU)
    {
        return (wc + 1 & 0x7f) >= 0x21 ? 1 : wc ? -1 : 0;
    }

    if((wc & (wchar_t)0xfffeffffU) < 0xfffe)
    {
        if((table[table[wc >> 8] * 32 + ((wc & 255) >> 3)] >> (wc & 7)) & 1)
        {
            return 0;
        }

        if((wtable[wtable[wc >> 8] * 32 + ((wc & 255) >> 3)] >> (wc & 7)) & 1)
        {
            return 2;
        }

        return 1;
    }

    if((wc & 0xfffe) == 0xfffe)
    {
        return -1;
    }

    if(wc - (wchar_t)0x20000U < 0x20000)
    {
        return 2;
    }

    if(wc == 0xe0001 || wc - (wchar_t)0xe0020U < 0x5f || wc - 0xe0100 < 0xef)
    {
        return 0;
    }

    return 1;
}