iswprint.c

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#include <wctype.h>

/* Consider all legal codepoints as printable except for:
 * - C0 and C1 control characters
 * - U+2028 and U+2029 (line/para break)
 * - U+FFF9 through U+FFFB (interlinear annotation controls)
 * The following code is optimized heavily to make hot paths for the
 * expected printable characters. */

int iswprint(wint_t wc)
{
    if(wc < 0xffU)
    {
        return (wc + 1 & 0x7f) >= 0x21;
    }
    if(wc < 0x2028U || wc - 0x202aU < 0xd800 - 0x202a || wc - 0xe000U < 0xfff9 - 0xe000)
    {
        return 1;
    }
    if(wc - 0xfffcU > 0x10ffff - 0xfffc || (wc & 0xfffe) == 0xfffe)
    {
        return 0;
    }

    return 1;
}