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      1 #include "vterm_internal.h"
      2 
      3 // ### The following from http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
      4 // With modifications:
      5 //   made functions static
      6 //   moved 'combining' table to file scope, so other functions can see it
      7 // ###################################################################
      8 
      9 /*
     10  * This is an implementation of wcwidth() and wcswidth() (defined in
     11  * IEEE Std 1002.1-2001) for Unicode.
     12  *
     13  * http://www.opengroup.org/onlinepubs/007904975/functions/wcwidth.html
     14  * http://www.opengroup.org/onlinepubs/007904975/functions/wcswidth.html
     15  *
     16  * In fixed-width output devices, Latin characters all occupy a single
     17  * "cell" position of equal width, whereas ideographic CJK characters
     18  * occupy two such cells. Interoperability between terminal-line
     19  * applications and (teletype-style) character terminals using the
     20  * UTF-8 encoding requires agreement on which character should advance
     21  * the cursor by how many cell positions. No established formal
     22  * standards exist at present on which Unicode character shall occupy
     23  * how many cell positions on character terminals. These routines are
     24  * a first attempt of defining such behavior based on simple rules
     25  * applied to data provided by the Unicode Consortium.
     26  *
     27  * For some graphical characters, the Unicode standard explicitly
     28  * defines a character-cell width via the definition of the East Asian
     29  * FullWidth (F), Wide (W), Half-width (H), and Narrow (Na) classes.
     30  * In all these cases, there is no ambiguity about which width a
     31  * terminal shall use. For characters in the East Asian Ambiguous (A)
     32  * class, the width choice depends purely on a preference of backward
     33  * compatibility with either historic CJK or Western practice.
     34  * Choosing single-width for these characters is easy to justify as
     35  * the appropriate long-term solution, as the CJK practice of
     36  * displaying these characters as double-width comes from historic
     37  * implementation simplicity (8-bit encoded characters were displayed
     38  * single-width and 16-bit ones double-width, even for Greek,
     39  * Cyrillic, etc.) and not any typographic considerations.
     40  *
     41  * Much less clear is the choice of width for the Not East Asian
     42  * (Neutral) class. Existing practice does not dictate a width for any
     43  * of these characters. It would nevertheless make sense
     44  * typographically to allocate two character cells to characters such
     45  * as for instance EM SPACE or VOLUME INTEGRAL, which cannot be
     46  * represented adequately with a single-width glyph. The following
     47  * routines at present merely assign a single-cell width to all
     48  * neutral characters, in the interest of simplicity. This is not
     49  * entirely satisfactory and should be reconsidered before
     50  * establishing a formal standard in this area. At the moment, the
     51  * decision which Not East Asian (Neutral) characters should be
     52  * represented by double-width glyphs cannot yet be answered by
     53  * applying a simple rule from the Unicode database content. Setting
     54  * up a proper standard for the behavior of UTF-8 character terminals
     55  * will require a careful analysis not only of each Unicode character,
     56  * but also of each presentation form, something the author of these
     57  * routines has avoided to do so far.
     58  *
     59  * http://www.unicode.org/unicode/reports/tr11/
     60  *
     61  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
     62  *
     63  * Permission to use, copy, modify, and distribute this software
     64  * for any purpose and without fee is hereby granted. The author
     65  * disclaims all warranties with regard to this software.
     66  *
     67  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
     68  */
     69 
     70 #include <wchar.h>
     71 
     72 struct interval {
     73   int first;
     74   int last;
     75 };
     76 
     77 /* sorted list of non-overlapping intervals of non-spacing characters */
     78 /* generated by "uniset +cat=Me +cat=Mn +cat=Cf -00AD +1160-11FF +200B c" */
     79 static const struct interval combining[] = {
     80   { 0x0300, 0x036F }, { 0x0483, 0x0486 }, { 0x0488, 0x0489 },
     81   { 0x0591, 0x05BD }, { 0x05BF, 0x05BF }, { 0x05C1, 0x05C2 },
     82   { 0x05C4, 0x05C5 }, { 0x05C7, 0x05C7 }, { 0x0600, 0x0603 },
     83   { 0x0610, 0x0615 }, { 0x064B, 0x065E }, { 0x0670, 0x0670 },
     84   { 0x06D6, 0x06E4 }, { 0x06E7, 0x06E8 }, { 0x06EA, 0x06ED },
     85   { 0x070F, 0x070F }, { 0x0711, 0x0711 }, { 0x0730, 0x074A },
     86   { 0x07A6, 0x07B0 }, { 0x07EB, 0x07F3 }, { 0x0901, 0x0902 },
     87   { 0x093C, 0x093C }, { 0x0941, 0x0948 }, { 0x094D, 0x094D },
     88   { 0x0951, 0x0954 }, { 0x0962, 0x0963 }, { 0x0981, 0x0981 },
     89   { 0x09BC, 0x09BC }, { 0x09C1, 0x09C4 }, { 0x09CD, 0x09CD },
     90   { 0x09E2, 0x09E3 }, { 0x0A01, 0x0A02 }, { 0x0A3C, 0x0A3C },
     91   { 0x0A41, 0x0A42 }, { 0x0A47, 0x0A48 }, { 0x0A4B, 0x0A4D },
     92   { 0x0A70, 0x0A71 }, { 0x0A81, 0x0A82 }, { 0x0ABC, 0x0ABC },
     93   { 0x0AC1, 0x0AC5 }, { 0x0AC7, 0x0AC8 }, { 0x0ACD, 0x0ACD },
     94   { 0x0AE2, 0x0AE3 }, { 0x0B01, 0x0B01 }, { 0x0B3C, 0x0B3C },
     95   { 0x0B3F, 0x0B3F }, { 0x0B41, 0x0B43 }, { 0x0B4D, 0x0B4D },
     96   { 0x0B56, 0x0B56 }, { 0x0B82, 0x0B82 }, { 0x0BC0, 0x0BC0 },
     97   { 0x0BCD, 0x0BCD }, { 0x0C3E, 0x0C40 }, { 0x0C46, 0x0C48 },
     98   { 0x0C4A, 0x0C4D }, { 0x0C55, 0x0C56 }, { 0x0CBC, 0x0CBC },
     99   { 0x0CBF, 0x0CBF }, { 0x0CC6, 0x0CC6 }, { 0x0CCC, 0x0CCD },
    100   { 0x0CE2, 0x0CE3 }, { 0x0D41, 0x0D43 }, { 0x0D4D, 0x0D4D },
    101   { 0x0DCA, 0x0DCA }, { 0x0DD2, 0x0DD4 }, { 0x0DD6, 0x0DD6 },
    102   { 0x0E31, 0x0E31 }, { 0x0E34, 0x0E3A }, { 0x0E47, 0x0E4E },
    103   { 0x0EB1, 0x0EB1 }, { 0x0EB4, 0x0EB9 }, { 0x0EBB, 0x0EBC },
    104   { 0x0EC8, 0x0ECD }, { 0x0F18, 0x0F19 }, { 0x0F35, 0x0F35 },
    105   { 0x0F37, 0x0F37 }, { 0x0F39, 0x0F39 }, { 0x0F71, 0x0F7E },
    106   { 0x0F80, 0x0F84 }, { 0x0F86, 0x0F87 }, { 0x0F90, 0x0F97 },
    107   { 0x0F99, 0x0FBC }, { 0x0FC6, 0x0FC6 }, { 0x102D, 0x1030 },
    108   { 0x1032, 0x1032 }, { 0x1036, 0x1037 }, { 0x1039, 0x1039 },
    109   { 0x1058, 0x1059 }, { 0x1160, 0x11FF }, { 0x135F, 0x135F },
    110   { 0x1712, 0x1714 }, { 0x1732, 0x1734 }, { 0x1752, 0x1753 },
    111   { 0x1772, 0x1773 }, { 0x17B4, 0x17B5 }, { 0x17B7, 0x17BD },
    112   { 0x17C6, 0x17C6 }, { 0x17C9, 0x17D3 }, { 0x17DD, 0x17DD },
    113   { 0x180B, 0x180D }, { 0x18A9, 0x18A9 }, { 0x1920, 0x1922 },
    114   { 0x1927, 0x1928 }, { 0x1932, 0x1932 }, { 0x1939, 0x193B },
    115   { 0x1A17, 0x1A18 }, { 0x1B00, 0x1B03 }, { 0x1B34, 0x1B34 },
    116   { 0x1B36, 0x1B3A }, { 0x1B3C, 0x1B3C }, { 0x1B42, 0x1B42 },
    117   { 0x1B6B, 0x1B73 }, { 0x1DC0, 0x1DCA }, { 0x1DFE, 0x1DFF },
    118   { 0x200B, 0x200F }, { 0x202A, 0x202E }, { 0x2060, 0x2063 },
    119   { 0x206A, 0x206F }, { 0x20D0, 0x20EF }, { 0x302A, 0x302F },
    120   { 0x3099, 0x309A }, { 0xA806, 0xA806 }, { 0xA80B, 0xA80B },
    121   { 0xA825, 0xA826 }, { 0xFB1E, 0xFB1E }, { 0xFE00, 0xFE0F },
    122   { 0xFE20, 0xFE23 }, { 0xFEFF, 0xFEFF }, { 0xFFF9, 0xFFFB },
    123   { 0x10A01, 0x10A03 }, { 0x10A05, 0x10A06 }, { 0x10A0C, 0x10A0F },
    124   { 0x10A38, 0x10A3A }, { 0x10A3F, 0x10A3F }, { 0x1D167, 0x1D169 },
    125   { 0x1D173, 0x1D182 }, { 0x1D185, 0x1D18B }, { 0x1D1AA, 0x1D1AD },
    126   { 0x1D242, 0x1D244 }, { 0xE0001, 0xE0001 }, { 0xE0020, 0xE007F },
    127   { 0xE0100, 0xE01EF }
    128 };
    129 
    130 
    131 /* auxiliary function for binary search in interval table */
    132 static int bisearch(wchar_t ucs, const struct interval *table, int max) {
    133   int min = 0;
    134   int mid;
    135 
    136   if (ucs < table[0].first || ucs > table[max].last)
    137     return 0;
    138   while (max >= min) {
    139     mid = (min + max) / 2;
    140     if (ucs > table[mid].last)
    141       min = mid + 1;
    142     else if (ucs < table[mid].first)
    143       max = mid - 1;
    144     else
    145       return 1;
    146   }
    147 
    148   return 0;
    149 }
    150 
    151 
    152 /* The following two functions define the column width of an ISO 10646
    153  * character as follows:
    154  *
    155  *    - The null character (U+0000) has a column width of 0.
    156  *
    157  *    - Other C0/C1 control characters and DEL will lead to a return
    158  *      value of -1.
    159  *
    160  *    - Non-spacing and enclosing combining characters (general
    161  *      category code Mn or Me in the Unicode database) have a
    162  *      column width of 0.
    163  *
    164  *    - SOFT HYPHEN (U+00AD) has a column width of 1.
    165  *
    166  *    - Other format characters (general category code Cf in the Unicode
    167  *      database) and ZERO WIDTH SPACE (U+200B) have a column width of 0.
    168  *
    169  *    - Hangul Jamo medial vowels and final consonants (U+1160-U+11FF)
    170  *      have a column width of 0.
    171  *
    172  *    - Spacing characters in the East Asian Wide (W) or East Asian
    173  *      Full-width (F) category as defined in Unicode Technical
    174  *      Report #11 have a column width of 2.
    175  *
    176  *    - All remaining characters (including all printable
    177  *      ISO 8859-1 and WGL4 characters, Unicode control characters,
    178  *      etc.) have a column width of 1.
    179  *
    180  * This implementation assumes that wchar_t characters are encoded
    181  * in ISO 10646.
    182  */
    183 
    184 
    185 static int mk_wcwidth(wchar_t ucs)
    186 {
    187   /* test for 8-bit control characters */
    188   if (ucs == 0)
    189     return 0;
    190   if (ucs < 32 || (ucs >= 0x7f && ucs < 0xa0))
    191     return -1;
    192 
    193   /* binary search in table of non-spacing characters */
    194   if (bisearch(ucs, combining,
    195                sizeof(combining) / sizeof(struct interval) - 1))
    196     return 0;
    197 
    198   /* if we arrive here, ucs is not a combining or C0/C1 control character */
    199 
    200   return 1 +
    201     (ucs >= 0x1100 &&
    202      (ucs <= 0x115f ||                    /* Hangul Jamo init. consonants */
    203       ucs == 0x2329 || ucs == 0x232a ||
    204       (ucs >= 0x2e80 && ucs <= 0xa4cf &&
    205        ucs != 0x303f) ||                  /* CJK ... Yi */
    206       (ucs >= 0xac00 && ucs <= 0xd7a3) || /* Hangul Syllables */
    207       (ucs >= 0xf900 && ucs <= 0xfaff) || /* CJK Compatibility Ideographs */
    208       (ucs >= 0xfe10 && ucs <= 0xfe19) || /* Vertical forms */
    209       (ucs >= 0xfe30 && ucs <= 0xfe6f) || /* CJK Compatibility Forms */
    210       (ucs >= 0xff00 && ucs <= 0xff60) || /* Fullwidth Forms */
    211       (ucs >= 0xffe0 && ucs <= 0xffe6) ||
    212       (ucs >= 0x20000 && ucs <= 0x2fffd) ||
    213       (ucs >= 0x30000 && ucs <= 0x3fffd)));
    214 }
    215 
    216 
    217 static int mk_wcswidth(const wchar_t *pwcs, size_t n)
    218 {
    219   int w, width = 0;
    220 
    221   for (;*pwcs && n-- > 0; pwcs++)
    222     if ((w = mk_wcwidth(*pwcs)) < 0)
    223       return -1;
    224     else
    225       width += w;
    226 
    227   return width;
    228 }
    229 
    230 
    231 /*
    232  * The following functions are the same as mk_wcwidth() and
    233  * mk_wcswidth(), except that spacing characters in the East Asian
    234  * Ambiguous (A) category as defined in Unicode Technical Report #11
    235  * have a column width of 2. This variant might be useful for users of
    236  * CJK legacy encodings who want to migrate to UCS without changing
    237  * the traditional terminal character-width behaviour. It is not
    238  * otherwise recommended for general use.
    239  */
    240 static int mk_wcwidth_cjk(wchar_t ucs)
    241 {
    242   /* sorted list of non-overlapping intervals of East Asian Ambiguous
    243    * characters, generated by "uniset +WIDTH-A -cat=Me -cat=Mn -cat=Cf c" */
    244   static const struct interval ambiguous[] = {
    245     { 0x00A1, 0x00A1 }, { 0x00A4, 0x00A4 }, { 0x00A7, 0x00A8 },
    246     { 0x00AA, 0x00AA }, { 0x00AE, 0x00AE }, { 0x00B0, 0x00B4 },
    247     { 0x00B6, 0x00BA }, { 0x00BC, 0x00BF }, { 0x00C6, 0x00C6 },
    248     { 0x00D0, 0x00D0 }, { 0x00D7, 0x00D8 }, { 0x00DE, 0x00E1 },
    249     { 0x00E6, 0x00E6 }, { 0x00E8, 0x00EA }, { 0x00EC, 0x00ED },
    250     { 0x00F0, 0x00F0 }, { 0x00F2, 0x00F3 }, { 0x00F7, 0x00FA },
    251     { 0x00FC, 0x00FC }, { 0x00FE, 0x00FE }, { 0x0101, 0x0101 },
    252     { 0x0111, 0x0111 }, { 0x0113, 0x0113 }, { 0x011B, 0x011B },
    253     { 0x0126, 0x0127 }, { 0x012B, 0x012B }, { 0x0131, 0x0133 },
    254     { 0x0138, 0x0138 }, { 0x013F, 0x0142 }, { 0x0144, 0x0144 },
    255     { 0x0148, 0x014B }, { 0x014D, 0x014D }, { 0x0152, 0x0153 },
    256     { 0x0166, 0x0167 }, { 0x016B, 0x016B }, { 0x01CE, 0x01CE },
    257     { 0x01D0, 0x01D0 }, { 0x01D2, 0x01D2 }, { 0x01D4, 0x01D4 },
    258     { 0x01D6, 0x01D6 }, { 0x01D8, 0x01D8 }, { 0x01DA, 0x01DA },
    259     { 0x01DC, 0x01DC }, { 0x0251, 0x0251 }, { 0x0261, 0x0261 },
    260     { 0x02C4, 0x02C4 }, { 0x02C7, 0x02C7 }, { 0x02C9, 0x02CB },
    261     { 0x02CD, 0x02CD }, { 0x02D0, 0x02D0 }, { 0x02D8, 0x02DB },
    262     { 0x02DD, 0x02DD }, { 0x02DF, 0x02DF }, { 0x0391, 0x03A1 },
    263     { 0x03A3, 0x03A9 }, { 0x03B1, 0x03C1 }, { 0x03C3, 0x03C9 },
    264     { 0x0401, 0x0401 }, { 0x0410, 0x044F }, { 0x0451, 0x0451 },
    265     { 0x2010, 0x2010 }, { 0x2013, 0x2016 }, { 0x2018, 0x2019 },
    266     { 0x201C, 0x201D }, { 0x2020, 0x2022 }, { 0x2024, 0x2027 },
    267     { 0x2030, 0x2030 }, { 0x2032, 0x2033 }, { 0x2035, 0x2035 },
    268     { 0x203B, 0x203B }, { 0x203E, 0x203E }, { 0x2074, 0x2074 },
    269     { 0x207F, 0x207F }, { 0x2081, 0x2084 }, { 0x20AC, 0x20AC },
    270     { 0x2103, 0x2103 }, { 0x2105, 0x2105 }, { 0x2109, 0x2109 },
    271     { 0x2113, 0x2113 }, { 0x2116, 0x2116 }, { 0x2121, 0x2122 },
    272     { 0x2126, 0x2126 }, { 0x212B, 0x212B }, { 0x2153, 0x2154 },
    273     { 0x215B, 0x215E }, { 0x2160, 0x216B }, { 0x2170, 0x2179 },
    274     { 0x2190, 0x2199 }, { 0x21B8, 0x21B9 }, { 0x21D2, 0x21D2 },
    275     { 0x21D4, 0x21D4 }, { 0x21E7, 0x21E7 }, { 0x2200, 0x2200 },
    276     { 0x2202, 0x2203 }, { 0x2207, 0x2208 }, { 0x220B, 0x220B },
    277     { 0x220F, 0x220F }, { 0x2211, 0x2211 }, { 0x2215, 0x2215 },
    278     { 0x221A, 0x221A }, { 0x221D, 0x2220 }, { 0x2223, 0x2223 },
    279     { 0x2225, 0x2225 }, { 0x2227, 0x222C }, { 0x222E, 0x222E },
    280     { 0x2234, 0x2237 }, { 0x223C, 0x223D }, { 0x2248, 0x2248 },
    281     { 0x224C, 0x224C }, { 0x2252, 0x2252 }, { 0x2260, 0x2261 },
    282     { 0x2264, 0x2267 }, { 0x226A, 0x226B }, { 0x226E, 0x226F },
    283     { 0x2282, 0x2283 }, { 0x2286, 0x2287 }, { 0x2295, 0x2295 },
    284     { 0x2299, 0x2299 }, { 0x22A5, 0x22A5 }, { 0x22BF, 0x22BF },
    285     { 0x2312, 0x2312 }, { 0x2460, 0x24E9 }, { 0x24EB, 0x254B },
    286     { 0x2550, 0x2573 }, { 0x2580, 0x258F }, { 0x2592, 0x2595 },
    287     { 0x25A0, 0x25A1 }, { 0x25A3, 0x25A9 }, { 0x25B2, 0x25B3 },
    288     { 0x25B6, 0x25B7 }, { 0x25BC, 0x25BD }, { 0x25C0, 0x25C1 },
    289     { 0x25C6, 0x25C8 }, { 0x25CB, 0x25CB }, { 0x25CE, 0x25D1 },
    290     { 0x25E2, 0x25E5 }, { 0x25EF, 0x25EF }, { 0x2605, 0x2606 },
    291     { 0x2609, 0x2609 }, { 0x260E, 0x260F }, { 0x2614, 0x2615 },
    292     { 0x261C, 0x261C }, { 0x261E, 0x261E }, { 0x2640, 0x2640 },
    293     { 0x2642, 0x2642 }, { 0x2660, 0x2661 }, { 0x2663, 0x2665 },
    294     { 0x2667, 0x266A }, { 0x266C, 0x266D }, { 0x266F, 0x266F },
    295     { 0x273D, 0x273D }, { 0x2776, 0x277F }, { 0xE000, 0xF8FF },
    296     { 0xFFFD, 0xFFFD }, { 0xF0000, 0xFFFFD }, { 0x100000, 0x10FFFD }
    297   };
    298 
    299   /* binary search in table of non-spacing characters */
    300   if (bisearch(ucs, ambiguous,
    301                sizeof(ambiguous) / sizeof(struct interval) - 1))
    302     return 2;
    303 
    304   return mk_wcwidth(ucs);
    305 }
    306 
    307 
    308 static int mk_wcswidth_cjk(const wchar_t *pwcs, size_t n)
    309 {
    310   int w, width = 0;
    311 
    312   for (;*pwcs && n-- > 0; pwcs++)
    313     if ((w = mk_wcwidth_cjk(*pwcs)) < 0)
    314       return -1;
    315     else
    316       width += w;
    317 
    318   return width;
    319 }
    320 
    321 // ################################
    322 // ### The rest added by Paul Evans
    323 
    324 int vterm_unicode_width(int codepoint)
    325 {
    326   return mk_wcwidth(codepoint);
    327 }
    328 
    329 int vterm_unicode_is_combining(int codepoint)
    330 {
    331   return bisearch(codepoint, combining, sizeof(combining) / sizeof(struct interval) - 1);
    332 }
    333