rt-thread/components/libc/compilers/common/cwchar.c

/*
 * Copyright (c) 2006-2022, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2014-01-01     mattn        implement wcwidth
 */

#include "posix/wchar.h"
#include <string.h>

struct interval
{
    long first;
    long last;
};

static int bisearch(wchar_t ucs, const struct interval *table, int max)
{
    int min = 0;
    int mid;

    if (ucs < table[0].first || ucs > table[max].last)
    {
        return 0;
    }

    while (max >= min)
    {
        mid = (min + max) / 2;
        if (ucs > table[mid].last)
        {
            min = mid + 1;
        }
        else if (ucs < table[mid].first)
        {
            max = mid - 1;
        }
        else
        {
            return 1;
        }
    }

    return 0;
}

int wcwidth(wchar_t ucs)
{
    /* sorted list of non-overlapping intervals of non-spacing characters */
    static const struct interval combining[] = {
        { 0x0300, 0x034E }, { 0x0360, 0x0362 }, { 0x0483, 0x0486 },
        { 0x0488, 0x0489 }, { 0x0591, 0x05A1 }, { 0x05A3, 0x05B9 },
        { 0x05BB, 0x05BD }, { 0x05BF, 0x05BF }, { 0x05C1, 0x05C2 },
        { 0x05C4, 0x05C4 }, { 0x064B, 0x0655 }, { 0x0670, 0x0670 },
        { 0x06D6, 0x06E4 }, { 0x06E7, 0x06E8 }, { 0x06EA, 0x06ED },
        { 0x070F, 0x070F }, { 0x0711, 0x0711 }, { 0x0730, 0x074A },
        { 0x07A6, 0x07B0 }, { 0x0901, 0x0902 }, { 0x093C, 0x093C },
        { 0x0941, 0x0948 }, { 0x094D, 0x094D }, { 0x0951, 0x0954 },
        { 0x0962, 0x0963 }, { 0x0981, 0x0981 }, { 0x09BC, 0x09BC },
        { 0x09C1, 0x09C4 }, { 0x09CD, 0x09CD }, { 0x09E2, 0x09E3 },
        { 0x0A02, 0x0A02 }, { 0x0A3C, 0x0A3C }, { 0x0A41, 0x0A42 },
        { 0x0A47, 0x0A48 }, { 0x0A4B, 0x0A4D }, { 0x0A70, 0x0A71 },
        { 0x0A81, 0x0A82 }, { 0x0ABC, 0x0ABC }, { 0x0AC1, 0x0AC5 },
        { 0x0AC7, 0x0AC8 }, { 0x0ACD, 0x0ACD }, { 0x0B01, 0x0B01 },
        { 0x0B3C, 0x0B3C }, { 0x0B3F, 0x0B3F }, { 0x0B41, 0x0B43 },
        { 0x0B4D, 0x0B4D }, { 0x0B56, 0x0B56 }, { 0x0B82, 0x0B82 },
        { 0x0BC0, 0x0BC0 }, { 0x0BCD, 0x0BCD }, { 0x0C3E, 0x0C40 },
        { 0x0C46, 0x0C48 }, { 0x0C4A, 0x0C4D }, { 0x0C55, 0x0C56 },
        { 0x0CBF, 0x0CBF }, { 0x0CC6, 0x0CC6 }, { 0x0CCC, 0x0CCD },
        { 0x0D41, 0x0D43 }, { 0x0D4D, 0x0D4D }, { 0x0DCA, 0x0DCA },
        { 0x0DD2, 0x0DD4 }, { 0x0DD6, 0x0DD6 }, { 0x0E31, 0x0E31 },
        { 0x0E34, 0x0E3A }, { 0x0E47, 0x0E4E }, { 0x0EB1, 0x0EB1 },
        { 0x0EB4, 0x0EB9 }, { 0x0EBB, 0x0EBC }, { 0x0EC8, 0x0ECD },
        { 0x0F18, 0x0F19 }, { 0x0F35, 0x0F35 }, { 0x0F37, 0x0F37 },
        { 0x0F39, 0x0F39 }, { 0x0F71, 0x0F7E }, { 0x0F80, 0x0F84 },
        { 0x0F86, 0x0F87 }, { 0x0F90, 0x0F97 }, { 0x0F99, 0x0FBC },
        { 0x0FC6, 0x0FC6 }, { 0x102D, 0x1030 }, { 0x1032, 0x1032 },
        { 0x1036, 0x1037 }, { 0x1039, 0x1039 }, { 0x1058, 0x1059 },
        { 0x1160, 0x11FF }, { 0x17B7, 0x17BD }, { 0x17C6, 0x17C6 },
        { 0x17C9, 0x17D3 }, { 0x180B, 0x180E }, { 0x18A9, 0x18A9 },
        { 0x200B, 0x200F }, { 0x202A, 0x202E }, { 0x206A, 0x206F },
        { 0x20D0, 0x20E3 }, { 0x302A, 0x302F }, { 0x3099, 0x309A },
        { 0xFB1E, 0xFB1E }, { 0xFE20, 0xFE23 }, { 0xFEFF, 0xFEFF },
        { 0xFFF9, 0xFFFB }
    };

    /* test for 8-bit control characters */
    if (ucs == 0)
    {
        return 0;
    }
    if (ucs < 32 || (ucs >= 0x7f && ucs < 0xa0))
    {
        return -1;
    }

    /* binary search in table of non-spacing characters */
    if (bisearch(ucs, combining, sizeof(combining) / sizeof(struct interval) - 1))
    {
        return 0;
    }

    return 1 +
        (ucs >= 0x1100 &&
        (ucs <= 0x115f ||                    /* Hangul Jamo init. consonants */
        (ucs >= 0x2e80 && ucs <= 0xa4cf && (ucs & ~0x0011) != 0x300a &&
        ucs != 0x303f) ||                  /* CJK ... Yi */
        (ucs >= 0xac00 && ucs <= 0xd7a3) || /* Hangul Syllables */
        (ucs >= 0xf900 && ucs <= 0xfaff) || /* CJK Compatibility Ideographs */
        (ucs >= 0xfe30 && ucs <= 0xfe6f) || /* CJK Compatibility Forms */
        (ucs >= 0xff00 && ucs <= 0xff5f) || /* Fullwidth Forms */
        (ucs >= 0xffe0 && ucs <= 0xffe6) // ||
    //#ifndef _WIN32
    //      (ucs >= 0x20000 && ucs <= 0x2ffff)
    //#else
    //    0
    //#endif
        ));
}

int wcswidth(const wchar_t *pwcs, size_t n)
{
    int w, width = 0;

    for (;*pwcs && n-- > 0; pwcs++)
    {
        if ((w = wcwidth(*pwcs)) < 0)
        {
            return -1;
        }
        else
        {
            width += w;
        }
    }
    return width;
}