The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/teken/teken_wcwidth.h

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    1 /*
    2  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
    3  *
    4  * Permission to use, copy, modify, and distribute this software
    5  * for any purpose and without fee is hereby granted. The author
    6  * disclaims all warranties with regard to this software.
    7  *
    8  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
    9  *
   10  * $FreeBSD: releng/11.0/sys/teken/teken_wcwidth.h 186681 2009-01-01 13:26:53Z ed $
   11  */
   12 
   13 struct interval {
   14   teken_char_t first;
   15   teken_char_t last;
   16 };
   17 
   18 /* auxiliary function for binary search in interval table */
   19 static int bisearch(teken_char_t ucs, const struct interval *table, int max) {
   20   int min = 0;
   21   int mid;
   22 
   23   if (ucs < table[0].first || ucs > table[max].last)
   24     return 0;
   25   while (max >= min) {
   26     mid = (min + max) / 2;
   27     if (ucs > table[mid].last)
   28       min = mid + 1;
   29     else if (ucs < table[mid].first)
   30       max = mid - 1;
   31     else
   32       return 1;
   33   }
   34 
   35   return 0;
   36 }
   37 
   38 static int teken_wcwidth(teken_char_t ucs)
   39 {
   40   /* sorted list of non-overlapping intervals of non-spacing characters */
   41   /* generated by "uniset +cat=Me +cat=Mn +cat=Cf -00AD +1160-11FF +200B c" */
   42   static const struct interval combining[] = {
   43     { 0x0300, 0x036F }, { 0x0483, 0x0486 }, { 0x0488, 0x0489 },
   44     { 0x0591, 0x05BD }, { 0x05BF, 0x05BF }, { 0x05C1, 0x05C2 },
   45     { 0x05C4, 0x05C5 }, { 0x05C7, 0x05C7 }, { 0x0600, 0x0603 },
   46     { 0x0610, 0x0615 }, { 0x064B, 0x065E }, { 0x0670, 0x0670 },
   47     { 0x06D6, 0x06E4 }, { 0x06E7, 0x06E8 }, { 0x06EA, 0x06ED },
   48     { 0x070F, 0x070F }, { 0x0711, 0x0711 }, { 0x0730, 0x074A },
   49     { 0x07A6, 0x07B0 }, { 0x07EB, 0x07F3 }, { 0x0901, 0x0902 },
   50     { 0x093C, 0x093C }, { 0x0941, 0x0948 }, { 0x094D, 0x094D },
   51     { 0x0951, 0x0954 }, { 0x0962, 0x0963 }, { 0x0981, 0x0981 },
   52     { 0x09BC, 0x09BC }, { 0x09C1, 0x09C4 }, { 0x09CD, 0x09CD },
   53     { 0x09E2, 0x09E3 }, { 0x0A01, 0x0A02 }, { 0x0A3C, 0x0A3C },
   54     { 0x0A41, 0x0A42 }, { 0x0A47, 0x0A48 }, { 0x0A4B, 0x0A4D },
   55     { 0x0A70, 0x0A71 }, { 0x0A81, 0x0A82 }, { 0x0ABC, 0x0ABC },
   56     { 0x0AC1, 0x0AC5 }, { 0x0AC7, 0x0AC8 }, { 0x0ACD, 0x0ACD },
   57     { 0x0AE2, 0x0AE3 }, { 0x0B01, 0x0B01 }, { 0x0B3C, 0x0B3C },
   58     { 0x0B3F, 0x0B3F }, { 0x0B41, 0x0B43 }, { 0x0B4D, 0x0B4D },
   59     { 0x0B56, 0x0B56 }, { 0x0B82, 0x0B82 }, { 0x0BC0, 0x0BC0 },
   60     { 0x0BCD, 0x0BCD }, { 0x0C3E, 0x0C40 }, { 0x0C46, 0x0C48 },
   61     { 0x0C4A, 0x0C4D }, { 0x0C55, 0x0C56 }, { 0x0CBC, 0x0CBC },
   62     { 0x0CBF, 0x0CBF }, { 0x0CC6, 0x0CC6 }, { 0x0CCC, 0x0CCD },
   63     { 0x0CE2, 0x0CE3 }, { 0x0D41, 0x0D43 }, { 0x0D4D, 0x0D4D },
   64     { 0x0DCA, 0x0DCA }, { 0x0DD2, 0x0DD4 }, { 0x0DD6, 0x0DD6 },
   65     { 0x0E31, 0x0E31 }, { 0x0E34, 0x0E3A }, { 0x0E47, 0x0E4E },
   66     { 0x0EB1, 0x0EB1 }, { 0x0EB4, 0x0EB9 }, { 0x0EBB, 0x0EBC },
   67     { 0x0EC8, 0x0ECD }, { 0x0F18, 0x0F19 }, { 0x0F35, 0x0F35 },
   68     { 0x0F37, 0x0F37 }, { 0x0F39, 0x0F39 }, { 0x0F71, 0x0F7E },
   69     { 0x0F80, 0x0F84 }, { 0x0F86, 0x0F87 }, { 0x0F90, 0x0F97 },
   70     { 0x0F99, 0x0FBC }, { 0x0FC6, 0x0FC6 }, { 0x102D, 0x1030 },
   71     { 0x1032, 0x1032 }, { 0x1036, 0x1037 }, { 0x1039, 0x1039 },
   72     { 0x1058, 0x1059 }, { 0x1160, 0x11FF }, { 0x135F, 0x135F },
   73     { 0x1712, 0x1714 }, { 0x1732, 0x1734 }, { 0x1752, 0x1753 },
   74     { 0x1772, 0x1773 }, { 0x17B4, 0x17B5 }, { 0x17B7, 0x17BD },
   75     { 0x17C6, 0x17C6 }, { 0x17C9, 0x17D3 }, { 0x17DD, 0x17DD },
   76     { 0x180B, 0x180D }, { 0x18A9, 0x18A9 }, { 0x1920, 0x1922 },
   77     { 0x1927, 0x1928 }, { 0x1932, 0x1932 }, { 0x1939, 0x193B },
   78     { 0x1A17, 0x1A18 }, { 0x1B00, 0x1B03 }, { 0x1B34, 0x1B34 },
   79     { 0x1B36, 0x1B3A }, { 0x1B3C, 0x1B3C }, { 0x1B42, 0x1B42 },
   80     { 0x1B6B, 0x1B73 }, { 0x1DC0, 0x1DCA }, { 0x1DFE, 0x1DFF },
   81     { 0x200B, 0x200F }, { 0x202A, 0x202E }, { 0x2060, 0x2063 },
   82     { 0x206A, 0x206F }, { 0x20D0, 0x20EF }, { 0x302A, 0x302F },
   83     { 0x3099, 0x309A }, { 0xA806, 0xA806 }, { 0xA80B, 0xA80B },
   84     { 0xA825, 0xA826 }, { 0xFB1E, 0xFB1E }, { 0xFE00, 0xFE0F },
   85     { 0xFE20, 0xFE23 }, { 0xFEFF, 0xFEFF }, { 0xFFF9, 0xFFFB },
   86     { 0x10A01, 0x10A03 }, { 0x10A05, 0x10A06 }, { 0x10A0C, 0x10A0F },
   87     { 0x10A38, 0x10A3A }, { 0x10A3F, 0x10A3F }, { 0x1D167, 0x1D169 },
   88     { 0x1D173, 0x1D182 }, { 0x1D185, 0x1D18B }, { 0x1D1AA, 0x1D1AD },
   89     { 0x1D242, 0x1D244 }, { 0xE0001, 0xE0001 }, { 0xE0020, 0xE007F },
   90     { 0xE0100, 0xE01EF }
   91   };
   92 
   93   /* test for 8-bit control characters */
   94   if (ucs == 0)
   95     return 0;
   96   if (ucs < 32 || (ucs >= 0x7f && ucs < 0xa0))
   97     return -1;
   98 
   99   /* binary search in table of non-spacing characters */
  100   if (bisearch(ucs, combining,
  101                sizeof(combining) / sizeof(struct interval) - 1))
  102     return 0;
  103 
  104   /* if we arrive here, ucs is not a combining or C0/C1 control character */
  105 
  106   return 1 + 
  107     (ucs >= 0x1100 &&
  108      (ucs <= 0x115f ||                    /* Hangul Jamo init. consonants */
  109       ucs == 0x2329 || ucs == 0x232a ||
  110       (ucs >= 0x2e80 && ucs <= 0xa4cf &&
  111        ucs != 0x303f) ||                  /* CJK ... Yi */
  112       (ucs >= 0xac00 && ucs <= 0xd7a3) || /* Hangul Syllables */
  113       (ucs >= 0xf900 && ucs <= 0xfaff) || /* CJK Compatibility Ideographs */
  114       (ucs >= 0xfe10 && ucs <= 0xfe19) || /* Vertical forms */
  115       (ucs >= 0xfe30 && ucs <= 0xfe6f) || /* CJK Compatibility Forms */
  116       (ucs >= 0xff00 && ucs <= 0xff60) || /* Fullwidth Forms */
  117       (ucs >= 0xffe0 && ucs <= 0xffe6) ||
  118       (ucs >= 0x20000 && ucs <= 0x2fffd) ||
  119       (ucs >= 0x30000 && ucs <= 0x3fffd)));
  120 }

Cache object: a67b7f58fbc61e85cd3852378c6c2ebd


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