120 lines
4.2 KiB
C
120 lines
4.2 KiB
C
/*
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* This is an implementation of wcwidth() and wcswidth() as defined in
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* "The Single UNIX Specification, Version 2, The Open Group, 1997"
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* <http://www.UNIX-systems.org/online.html>
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*
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* Markus Kuhn -- 2001-01-12 -- public domain
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* ftp://ftp.maths.tcd.ie/src/windows/putty/wcwidth.c
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*/
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#include <wchar.h>
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struct interval {
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unsigned short first;
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unsigned short last;
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};
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/* auxiliary function for binary search in interval table */
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static int bisearch(wchar_t ucs, const struct interval *table, int max) {
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int min = 0;
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int mid;
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if (ucs < table[0].first || ucs > table[max].last)
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return 0;
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while (max >= min) {
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mid = (min + max) / 2;
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if (ucs > table[mid].last)
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min = mid + 1;
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else if (ucs < table[mid].first)
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max = mid - 1;
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else
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return 1;
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}
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return 0;
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}
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#ifdef _WIN32
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int wcwidth(wchar_t ucs)
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{
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/* sorted list of non-overlapping intervals of non-spacing characters */
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static const struct interval combining[] = {
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{ 0x0300, 0x034E }, { 0x0360, 0x0362 }, { 0x0483, 0x0486 },
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{ 0x0488, 0x0489 }, { 0x0591, 0x05A1 }, { 0x05A3, 0x05B9 },
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{ 0x05BB, 0x05BD }, { 0x05BF, 0x05BF }, { 0x05C1, 0x05C2 },
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{ 0x05C4, 0x05C4 }, { 0x064B, 0x0655 }, { 0x0670, 0x0670 },
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{ 0x06D6, 0x06E4 }, { 0x06E7, 0x06E8 }, { 0x06EA, 0x06ED },
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{ 0x070F, 0x070F }, { 0x0711, 0x0711 }, { 0x0730, 0x074A },
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{ 0x07A6, 0x07B0 }, { 0x0901, 0x0902 }, { 0x093C, 0x093C },
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{ 0x0941, 0x0948 }, { 0x094D, 0x094D }, { 0x0951, 0x0954 },
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{ 0x0962, 0x0963 }, { 0x0981, 0x0981 }, { 0x09BC, 0x09BC },
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{ 0x09C1, 0x09C4 }, { 0x09CD, 0x09CD }, { 0x09E2, 0x09E3 },
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{ 0x0A02, 0x0A02 }, { 0x0A3C, 0x0A3C }, { 0x0A41, 0x0A42 },
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{ 0x0A47, 0x0A48 }, { 0x0A4B, 0x0A4D }, { 0x0A70, 0x0A71 },
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{ 0x0A81, 0x0A82 }, { 0x0ABC, 0x0ABC }, { 0x0AC1, 0x0AC5 },
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{ 0x0AC7, 0x0AC8 }, { 0x0ACD, 0x0ACD }, { 0x0B01, 0x0B01 },
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{ 0x0B3C, 0x0B3C }, { 0x0B3F, 0x0B3F }, { 0x0B41, 0x0B43 },
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{ 0x0B4D, 0x0B4D }, { 0x0B56, 0x0B56 }, { 0x0B82, 0x0B82 },
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{ 0x0BC0, 0x0BC0 }, { 0x0BCD, 0x0BCD }, { 0x0C3E, 0x0C40 },
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{ 0x0C46, 0x0C48 }, { 0x0C4A, 0x0C4D }, { 0x0C55, 0x0C56 },
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{ 0x0CBF, 0x0CBF }, { 0x0CC6, 0x0CC6 }, { 0x0CCC, 0x0CCD },
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{ 0x0D41, 0x0D43 }, { 0x0D4D, 0x0D4D }, { 0x0DCA, 0x0DCA },
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{ 0x0DD2, 0x0DD4 }, { 0x0DD6, 0x0DD6 }, { 0x0E31, 0x0E31 },
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{ 0x0E34, 0x0E3A }, { 0x0E47, 0x0E4E }, { 0x0EB1, 0x0EB1 },
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{ 0x0EB4, 0x0EB9 }, { 0x0EBB, 0x0EBC }, { 0x0EC8, 0x0ECD },
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{ 0x0F18, 0x0F19 }, { 0x0F35, 0x0F35 }, { 0x0F37, 0x0F37 },
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{ 0x0F39, 0x0F39 }, { 0x0F71, 0x0F7E }, { 0x0F80, 0x0F84 },
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{ 0x0F86, 0x0F87 }, { 0x0F90, 0x0F97 }, { 0x0F99, 0x0FBC },
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{ 0x0FC6, 0x0FC6 }, { 0x102D, 0x1030 }, { 0x1032, 0x1032 },
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{ 0x1036, 0x1037 }, { 0x1039, 0x1039 }, { 0x1058, 0x1059 },
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{ 0x1160, 0x11FF }, { 0x17B7, 0x17BD }, { 0x17C6, 0x17C6 },
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{ 0x17C9, 0x17D3 }, { 0x180B, 0x180E }, { 0x18A9, 0x18A9 },
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{ 0x200B, 0x200F }, { 0x202A, 0x202E }, { 0x206A, 0x206F },
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{ 0x20D0, 0x20E3 }, { 0x302A, 0x302F }, { 0x3099, 0x309A },
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{ 0xFB1E, 0xFB1E }, { 0xFE20, 0xFE23 }, { 0xFEFF, 0xFEFF },
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{ 0xFFF9, 0xFFFB }
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};
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/* test for 8-bit control characters */
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if (ucs == 0)
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return 0;
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if (ucs < 32 || (ucs >= 0x7f && ucs < 0xa0))
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return -1;
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/* binary search in table of non-spacing characters */
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if (bisearch(ucs, combining,
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sizeof(combining) / sizeof(struct interval) - 1))
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return 0;
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/* if we arrive here, ucs is not a combining or C0/C1 control character */
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return 1 +
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(ucs >= 0x1100 &&
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(ucs <= 0x115f || /* Hangul Jamo init. consonants */
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(ucs >= 0x2e80 && ucs <= 0xa4cf && (ucs & ~0x0011) != 0x300a &&
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ucs != 0x303f) || /* CJK ... Yi */
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(ucs >= 0xac00 && ucs <= 0xd7a3) || /* Hangul Syllables */
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(ucs >= 0xf900 && ucs <= 0xfaff) || /* CJK Compatibility Ideographs */
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(ucs >= 0xfe30 && ucs <= 0xfe6f) || /* CJK Compatibility Forms */
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(ucs >= 0xff00 && ucs <= 0xff5f) || /* Fullwidth Forms */
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(ucs >= 0xffe0 && ucs <= 0xffe6) ||
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(ucs >= 0x20000 && ucs <= 0x2ffff)));
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}
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int wcswidth(const wchar_t *pwcs, size_t n)
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{
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int w, width = 0;
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for (;*pwcs && n-- > 0; pwcs++)
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if ((w = wcwidth(*pwcs)) < 0)
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return -1;
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else
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width += w;
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return width;
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}
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#endif
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