| /* |
| * This is an implementation of wcwidth() and wcswidth() (defined in |
| * IEEE Std 1002.1-2001) for Unicode. |
| * |
| * http://www.opengroup.org/onlinepubs/007904975/functions/wcwidth.html |
| * http://www.opengroup.org/onlinepubs/007904975/functions/wcswidth.html |
| * |
| * In fixed-width output devices, Latin characters all occupy a single |
| * "cell" position of equal width, whereas ideographic CJK characters |
| * occupy two such cells. Interoperability between terminal-line |
| * applications and (teletype-style) character terminals using the |
| * UTF-8 encoding requires agreement on which character should advance |
| * the cursor by how many cell positions. No established formal |
| * standards exist at present on which Unicode character shall occupy |
| * how many cell positions on character terminals. These routines are |
| * a first attempt of defining such behavior based on simple rules |
| * applied to data provided by the Unicode Consortium. |
| * |
| * For some graphical characters, the Unicode standard explicitly |
| * defines a character-cell width via the definition of the East Asian |
| * FullWidth (F), Wide (W), Half-width (H), and Narrow (Na) classes. |
| * In all these cases, there is no ambiguity about which width a |
| * terminal shall use. For characters in the East Asian Ambiguous (A) |
| * class, the width choice depends purely on a preference of backward |
| * compatibility with either historic CJK or Western practice. |
| * Choosing single-width for these characters is easy to justify as |
| * the appropriate long-term solution, as the CJK practice of |
| * displaying these characters as double-width comes from historic |
| * implementation simplicity (8-bit encoded characters were displayed |
| * single-width and 16-bit ones double-width, even for Greek, |
| * Cyrillic, etc.) and not any typographic considerations. |
| * |
| * Much less clear is the choice of width for the Not East Asian |
| * (Neutral) class. Existing practice does not dictate a width for any |
| * of these characters. It would nevertheless make sense |
| * typographically to allocate two character cells to characters such |
| * as for instance EM SPACE or VOLUME INTEGRAL, which cannot be |
| * represented adequately with a single-width glyph. The following |
| * routines at present merely assign a single-cell width to all |
| * neutral characters, in the interest of simplicity. This is not |
| * entirely satisfactory and should be reconsidered before |
| * establishing a formal standard in this area. At the moment, the |
| * decision which Not East Asian (Neutral) characters should be |
| * represented by double-width glyphs cannot yet be answered by |
| * applying a simple rule from the Unicode database content. Setting |
| * up a proper standard for the behavior of UTF-8 character terminals |
| * will require a careful analysis not only of each Unicode character, |
| * but also of each presentation form, something the author of these |
| * routines has avoided to do so far. |
| * |
| * http://www.unicode.org/unicode/reports/tr11/ |
| * |
| * Markus Kuhn -- 2007-05-26 (Unicode 5.0) |
| * |
| * Permission to use, copy, modify, and distribute this software |
| * for any purpose and without fee is hereby granted. The author |
| * disclaims all warranties with regard to this software. |
| * |
| * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c |
| */ |
| |
| struct interval { |
| uint16_t first; |
| uint16_t last; |
| }; |
| |
| /* auxiliary function for binary search in interval table */ |
| static int in_interval_table(unsigned ucs, const struct interval *table, unsigned max) |
| { |
| unsigned min; |
| unsigned mid; |
| |
| if (ucs < table[0].first || ucs > table[max].last) |
| return 0; |
| |
| min = 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; |
| } |
| |
| static int in_uint16_table(unsigned ucs, const uint16_t *table, unsigned max) |
| { |
| unsigned min; |
| unsigned mid; |
| unsigned first, last; |
| |
| first = table[0] >> 2; |
| last = first + (table[0] & 3); |
| if (ucs < first || ucs > last) |
| return 0; |
| |
| min = 0; |
| while (max >= min) { |
| mid = (min + max) / 2; |
| first = table[mid] >> 2; |
| last = first + (table[mid] & 3); |
| if (ucs > last) |
| min = mid + 1; |
| else if (ucs < first) |
| max = mid - 1; |
| else |
| return 1; |
| } |
| return 0; |
| } |
| |
| |
| /* The following two functions define the column width of an ISO 10646 |
| * character as follows: |
| * |
| * - The null character (U+0000) has a column width of 0. |
| * |
| * - Other C0/C1 control characters and DEL will lead to a return |
| * value of -1. |
| * |
| * - Non-spacing and enclosing combining characters (general |
| * category code Mn or Me in the Unicode database) have a |
| * column width of 0. |
| * |
| * - SOFT HYPHEN (U+00AD) has a column width of 1. |
| * |
| * - Other format characters (general category code Cf in the Unicode |
| * database) and ZERO WIDTH SPACE (U+200B) have a column width of 0. |
| * |
| * - Hangul Jamo medial vowels and final consonants (U+1160-U+11FF) |
| * have a column width of 0. |
| * |
| * - Spacing characters in the East Asian Wide (W) or East Asian |
| * Full-width (F) category as defined in Unicode Technical |
| * Report #11 have a column width of 2. |
| * |
| * - All remaining characters (including all printable |
| * ISO 8859-1 and WGL4 characters, Unicode control characters, |
| * etc.) have a column width of 1. |
| * |
| * This implementation assumes that wchar_t characters are encoded |
| * in ISO 10646. |
| */ |
| static int wcwidth(unsigned ucs) |
| { |
| /* sorted list of non-overlapping intervals of non-spacing characters */ |
| /* generated by "uniset +cat=Me +cat=Mn +cat=Cf -00AD +1160-11FF +200B c" */ |
| static const struct interval combining[] = { |
| #define BIG_(a,b) { a, b }, |
| #define PAIR(a,b) |
| /* PAIR if < 0x4000 and no more than 4 chars big */ |
| BIG_(0x0300, 0x036F) |
| PAIR(0x0483, 0x0486) |
| PAIR(0x0488, 0x0489) |
| BIG_(0x0591, 0x05BD) |
| PAIR(0x05BF, 0x05BF) |
| PAIR(0x05C1, 0x05C2) |
| PAIR(0x05C4, 0x05C5) |
| PAIR(0x05C7, 0x05C7) |
| PAIR(0x0600, 0x0603) |
| BIG_(0x0610, 0x0615) |
| BIG_(0x064B, 0x065E) |
| PAIR(0x0670, 0x0670) |
| BIG_(0x06D6, 0x06E4) |
| PAIR(0x06E7, 0x06E8) |
| PAIR(0x06EA, 0x06ED) |
| PAIR(0x070F, 0x070F) |
| PAIR(0x0711, 0x0711) |
| BIG_(0x0730, 0x074A) |
| BIG_(0x07A6, 0x07B0) |
| BIG_(0x07EB, 0x07F3) |
| PAIR(0x0901, 0x0902) |
| PAIR(0x093C, 0x093C) |
| BIG_(0x0941, 0x0948) |
| PAIR(0x094D, 0x094D) |
| PAIR(0x0951, 0x0954) |
| PAIR(0x0962, 0x0963) |
| PAIR(0x0981, 0x0981) |
| PAIR(0x09BC, 0x09BC) |
| PAIR(0x09C1, 0x09C4) |
| PAIR(0x09CD, 0x09CD) |
| PAIR(0x09E2, 0x09E3) |
| PAIR(0x0A01, 0x0A02) |
| PAIR(0x0A3C, 0x0A3C) |
| PAIR(0x0A41, 0x0A42) |
| PAIR(0x0A47, 0x0A48) |
| PAIR(0x0A4B, 0x0A4D) |
| PAIR(0x0A70, 0x0A71) |
| PAIR(0x0A81, 0x0A82) |
| PAIR(0x0ABC, 0x0ABC) |
| BIG_(0x0AC1, 0x0AC5) |
| PAIR(0x0AC7, 0x0AC8) |
| PAIR(0x0ACD, 0x0ACD) |
| PAIR(0x0AE2, 0x0AE3) |
| PAIR(0x0B01, 0x0B01) |
| PAIR(0x0B3C, 0x0B3C) |
| PAIR(0x0B3F, 0x0B3F) |
| PAIR(0x0B41, 0x0B43) |
| PAIR(0x0B4D, 0x0B4D) |
| PAIR(0x0B56, 0x0B56) |
| PAIR(0x0B82, 0x0B82) |
| PAIR(0x0BC0, 0x0BC0) |
| PAIR(0x0BCD, 0x0BCD) |
| PAIR(0x0C3E, 0x0C40) |
| PAIR(0x0C46, 0x0C48) |
| PAIR(0x0C4A, 0x0C4D) |
| PAIR(0x0C55, 0x0C56) |
| PAIR(0x0CBC, 0x0CBC) |
| PAIR(0x0CBF, 0x0CBF) |
| PAIR(0x0CC6, 0x0CC6) |
| PAIR(0x0CCC, 0x0CCD) |
| PAIR(0x0CE2, 0x0CE3) |
| PAIR(0x0D41, 0x0D43) |
| PAIR(0x0D4D, 0x0D4D) |
| PAIR(0x0DCA, 0x0DCA) |
| PAIR(0x0DD2, 0x0DD4) |
| PAIR(0x0DD6, 0x0DD6) |
| PAIR(0x0E31, 0x0E31) |
| BIG_(0x0E34, 0x0E3A) |
| BIG_(0x0E47, 0x0E4E) |
| PAIR(0x0EB1, 0x0EB1) |
| BIG_(0x0EB4, 0x0EB9) |
| PAIR(0x0EBB, 0x0EBC) |
| BIG_(0x0EC8, 0x0ECD) |
| PAIR(0x0F18, 0x0F19) |
| PAIR(0x0F35, 0x0F35) |
| PAIR(0x0F37, 0x0F37) |
| PAIR(0x0F39, 0x0F39) |
| BIG_(0x0F71, 0x0F7E) |
| BIG_(0x0F80, 0x0F84) |
| PAIR(0x0F86, 0x0F87) |
| PAIR(0x0FC6, 0x0FC6) |
| BIG_(0x0F90, 0x0F97) |
| BIG_(0x0F99, 0x0FBC) |
| PAIR(0x102D, 0x1030) |
| PAIR(0x1032, 0x1032) |
| PAIR(0x1036, 0x1037) |
| PAIR(0x1039, 0x1039) |
| PAIR(0x1058, 0x1059) |
| BIG_(0x1160, 0x11FF) |
| PAIR(0x135F, 0x135F) |
| PAIR(0x1712, 0x1714) |
| PAIR(0x1732, 0x1734) |
| PAIR(0x1752, 0x1753) |
| PAIR(0x1772, 0x1773) |
| PAIR(0x17B4, 0x17B5) |
| BIG_(0x17B7, 0x17BD) |
| PAIR(0x17C6, 0x17C6) |
| BIG_(0x17C9, 0x17D3) |
| PAIR(0x17DD, 0x17DD) |
| PAIR(0x180B, 0x180D) |
| PAIR(0x18A9, 0x18A9) |
| PAIR(0x1920, 0x1922) |
| PAIR(0x1927, 0x1928) |
| PAIR(0x1932, 0x1932) |
| PAIR(0x1939, 0x193B) |
| PAIR(0x1A17, 0x1A18) |
| PAIR(0x1B00, 0x1B03) |
| PAIR(0x1B34, 0x1B34) |
| BIG_(0x1B36, 0x1B3A) |
| PAIR(0x1B3C, 0x1B3C) |
| PAIR(0x1B42, 0x1B42) |
| BIG_(0x1B6B, 0x1B73) |
| BIG_(0x1DC0, 0x1DCA) |
| PAIR(0x1DFE, 0x1DFF) |
| BIG_(0x200B, 0x200F) |
| BIG_(0x202A, 0x202E) |
| PAIR(0x2060, 0x2063) |
| BIG_(0x206A, 0x206F) |
| BIG_(0x20D0, 0x20EF) |
| BIG_(0x302A, 0x302F) |
| PAIR(0x3099, 0x309A) |
| /* Too big to be packed in PAIRs: */ |
| { 0xA806, 0xA806 }, |
| { 0xA80B, 0xA80B }, |
| { 0xA825, 0xA826 }, |
| { 0xFB1E, 0xFB1E }, |
| { 0xFE00, 0xFE0F }, |
| { 0xFE20, 0xFE23 }, |
| { 0xFEFF, 0xFEFF }, |
| { 0xFFF9, 0xFFFB } |
| #undef BIG_ |
| #undef PAIR |
| }; |
| static const uint16_t combining1[] = { |
| #define BIG_(a,b) |
| #define PAIR(a,b) (a << 2) | (b-a), |
| /* Exact copy-n-paste of the above: */ |
| BIG_(0x0300, 0x036F) |
| PAIR(0x0483, 0x0486) |
| PAIR(0x0488, 0x0489) |
| BIG_(0x0591, 0x05BD) |
| PAIR(0x05BF, 0x05BF) |
| PAIR(0x05C1, 0x05C2) |
| PAIR(0x05C4, 0x05C5) |
| PAIR(0x05C7, 0x05C7) |
| PAIR(0x0600, 0x0603) |
| BIG_(0x0610, 0x0615) |
| BIG_(0x064B, 0x065E) |
| PAIR(0x0670, 0x0670) |
| BIG_(0x06D6, 0x06E4) |
| PAIR(0x06E7, 0x06E8) |
| PAIR(0x06EA, 0x06ED) |
| PAIR(0x070F, 0x070F) |
| PAIR(0x0711, 0x0711) |
| BIG_(0x0730, 0x074A) |
| BIG_(0x07A6, 0x07B0) |
| BIG_(0x07EB, 0x07F3) |
| PAIR(0x0901, 0x0902) |
| PAIR(0x093C, 0x093C) |
| BIG_(0x0941, 0x0948) |
| PAIR(0x094D, 0x094D) |
| PAIR(0x0951, 0x0954) |
| PAIR(0x0962, 0x0963) |
| PAIR(0x0981, 0x0981) |
| PAIR(0x09BC, 0x09BC) |
| PAIR(0x09C1, 0x09C4) |
| PAIR(0x09CD, 0x09CD) |
| PAIR(0x09E2, 0x09E3) |
| PAIR(0x0A01, 0x0A02) |
| PAIR(0x0A3C, 0x0A3C) |
| PAIR(0x0A41, 0x0A42) |
| PAIR(0x0A47, 0x0A48) |
| PAIR(0x0A4B, 0x0A4D) |
| PAIR(0x0A70, 0x0A71) |
| PAIR(0x0A81, 0x0A82) |
| PAIR(0x0ABC, 0x0ABC) |
| BIG_(0x0AC1, 0x0AC5) |
| PAIR(0x0AC7, 0x0AC8) |
| PAIR(0x0ACD, 0x0ACD) |
| PAIR(0x0AE2, 0x0AE3) |
| PAIR(0x0B01, 0x0B01) |
| PAIR(0x0B3C, 0x0B3C) |
| PAIR(0x0B3F, 0x0B3F) |
| PAIR(0x0B41, 0x0B43) |
| PAIR(0x0B4D, 0x0B4D) |
| PAIR(0x0B56, 0x0B56) |
| PAIR(0x0B82, 0x0B82) |
| PAIR(0x0BC0, 0x0BC0) |
| PAIR(0x0BCD, 0x0BCD) |
| PAIR(0x0C3E, 0x0C40) |
| PAIR(0x0C46, 0x0C48) |
| PAIR(0x0C4A, 0x0C4D) |
| PAIR(0x0C55, 0x0C56) |
| PAIR(0x0CBC, 0x0CBC) |
| PAIR(0x0CBF, 0x0CBF) |
| PAIR(0x0CC6, 0x0CC6) |
| PAIR(0x0CCC, 0x0CCD) |
| PAIR(0x0CE2, 0x0CE3) |
| PAIR(0x0D41, 0x0D43) |
| PAIR(0x0D4D, 0x0D4D) |
| PAIR(0x0DCA, 0x0DCA) |
| PAIR(0x0DD2, 0x0DD4) |
| PAIR(0x0DD6, 0x0DD6) |
| PAIR(0x0E31, 0x0E31) |
| BIG_(0x0E34, 0x0E3A) |
| BIG_(0x0E47, 0x0E4E) |
| PAIR(0x0EB1, 0x0EB1) |
| BIG_(0x0EB4, 0x0EB9) |
| PAIR(0x0EBB, 0x0EBC) |
| BIG_(0x0EC8, 0x0ECD) |
| PAIR(0x0F18, 0x0F19) |
| PAIR(0x0F35, 0x0F35) |
| PAIR(0x0F37, 0x0F37) |
| PAIR(0x0F39, 0x0F39) |
| BIG_(0x0F71, 0x0F7E) |
| BIG_(0x0F80, 0x0F84) |
| PAIR(0x0F86, 0x0F87) |
| PAIR(0x0FC6, 0x0FC6) |
| BIG_(0x0F90, 0x0F97) |
| BIG_(0x0F99, 0x0FBC) |
| PAIR(0x102D, 0x1030) |
| PAIR(0x1032, 0x1032) |
| PAIR(0x1036, 0x1037) |
| PAIR(0x1039, 0x1039) |
| PAIR(0x1058, 0x1059) |
| BIG_(0x1160, 0x11FF) |
| PAIR(0x135F, 0x135F) |
| PAIR(0x1712, 0x1714) |
| PAIR(0x1732, 0x1734) |
| PAIR(0x1752, 0x1753) |
| PAIR(0x1772, 0x1773) |
| PAIR(0x17B4, 0x17B5) |
| BIG_(0x17B7, 0x17BD) |
| PAIR(0x17C6, 0x17C6) |
| BIG_(0x17C9, 0x17D3) |
| PAIR(0x17DD, 0x17DD) |
| PAIR(0x180B, 0x180D) |
| PAIR(0x18A9, 0x18A9) |
| PAIR(0x1920, 0x1922) |
| PAIR(0x1927, 0x1928) |
| PAIR(0x1932, 0x1932) |
| PAIR(0x1939, 0x193B) |
| PAIR(0x1A17, 0x1A18) |
| PAIR(0x1B00, 0x1B03) |
| PAIR(0x1B34, 0x1B34) |
| BIG_(0x1B36, 0x1B3A) |
| PAIR(0x1B3C, 0x1B3C) |
| PAIR(0x1B42, 0x1B42) |
| BIG_(0x1B6B, 0x1B73) |
| BIG_(0x1DC0, 0x1DCA) |
| PAIR(0x1DFE, 0x1DFF) |
| BIG_(0x200B, 0x200F) |
| BIG_(0x202A, 0x202E) |
| PAIR(0x2060, 0x2063) |
| BIG_(0x206A, 0x206F) |
| BIG_(0x20D0, 0x20EF) |
| BIG_(0x302A, 0x302F) |
| PAIR(0x3099, 0x309A) |
| #undef BIG_ |
| #undef PAIR |
| }; |
| struct CHECK { |
| #define BIG_(a,b) char big##a[b-a <= 3 ? -1 : 1]; |
| #define PAIR(a,b) char pair##a[b-a > 3 ? -1 : 1]; |
| /* Copy-n-paste it here again to verify correctness */ |
| #undef BIG_ |
| #undef PAIR |
| }; |
| static const struct interval combining0x10000[] = { |
| { 0x0A01, 0x0A03 }, { 0x0A05, 0x0A06 }, { 0x0A0C, 0x0A0F }, |
| { 0x0A38, 0x0A3A }, { 0x0A3F, 0x0A3F }, { 0xD167, 0xD169 }, |
| { 0xD173, 0xD182 }, { 0xD185, 0xD18B }, { 0xD1AA, 0xD1AD }, |
| { 0xD242, 0xD244 } |
| }; |
| |
| if (ucs == 0) |
| return 0; |
| /* test for 8-bit control characters (00-1f, 80-9f, 7f) */ |
| if ((ucs & ~0x80) < 0x20 || ucs == 0x7f) |
| return -1; |
| if (ucs < 0x0300) /* optimization */ |
| return 1; |
| |
| /* binary search in table of non-spacing characters */ |
| if (in_interval_table(ucs, combining, ARRAY_SIZE(combining) - 1)) |
| return 0; |
| if (in_uint16_table(ucs, combining1, ARRAY_SIZE(combining1) - 1)) |
| return 0; |
| |
| if (ucs < 0x1100) /* optimization */ |
| return 1; |
| |
| /* binary search in table of non-spacing characters, cont. */ |
| if (in_interval_table(ucs ^ 0x10000, combining0x10000, ARRAY_SIZE(combining0x10000) - 1)) |
| return 0; |
| if (ucs == 0xE0001 |
| || (ucs >= 0xE0020 && ucs <= 0xE007F) |
| || (ucs >= 0xE0100 && ucs <= 0xE01EF) |
| ) { |
| return 0; |
| } |
| |
| /* if we arrive here, ucs is not a combining or C0/C1 control character */ |
| |
| return 1 + |
| ( (/*ucs >= 0x1100 &&*/ ucs <= 0x115f) /* Hangul Jamo init. consonants */ |
| || ucs == 0x2329 |
| || ucs == 0x232a |
| || (ucs >= 0x2e80 && ucs <= 0xa4cf && ucs != 0x303f) /* CJK ... Yi */ |
| || (ucs >= 0xac00 && ucs <= 0xd7a3) /* Hangul Syllables */ |
| || (ucs >= 0xf900 && ucs <= 0xfaff) /* CJK Compatibility Ideographs */ |
| || (ucs >= 0xfe10 && ucs <= 0xfe19) /* Vertical forms */ |
| || (ucs >= 0xfe30 && ucs <= 0xfe6f) /* CJK Compatibility Forms */ |
| || (ucs >= 0xff00 && ucs <= 0xff60) /* Fullwidth Forms */ |
| || (ucs >= 0xffe0 && ucs <= 0xffe6) |
| || (ucs >= 0x20000 && ucs <= 0x2fffd) |
| || (ucs >= 0x30000 && ucs <= 0x3fffd) |
| ); |
| } |
