1 /* 2 * This is an implementation of wcwidth() and wcswidth() as defined in 3 * "The Single UNIX Specification, Version 2, The Open Group, 1997" 4 * <http://www.UNIX-systems.org/online.html> 5 * 6 * Markus Kuhn -- 2001-09-08 -- public domain 7 */ 8 9 #include <wchar.h> 10 11 struct interval { 12 unsigned short first; 13 unsigned short last; 14 }; 15 16 /* auxiliary function for binary search in interval table */ 17 static int bisearch(wchar_t ucs, const struct interval *table, int max) { 18 int min = 0; 19 int mid; 20 21 if (ucs < table[0].first || ucs > table[max].last) 22 return 0; 23 while (max >= min) { 24 mid = (min + max) / 2; 25 if (ucs > table[mid].last) 26 min = mid + 1; 27 else if (ucs < table[mid].first) 28 max = mid - 1; 29 else 30 return 1; 31 } 32 33 return 0; 34 } 35 36 37 /* The following functions define the column width of an ISO 10646 38 * character as follows: 39 * 40 * - The null character (U+0000) has a column width of 0. 41 * 42 * - Other C0/C1 control characters and DEL will lead to a return 43 * value of -1. 44 * 45 * - Non-spacing and enclosing combining characters (general 46 * category code Mn or Me in the Unicode database) have a 47 * column width of 0. 48 * 49 * - Other format characters (general category code Cf in the Unicode 50 * database) and ZERO WIDTH SPACE (U+200B) have a column width of 0. 51 * 52 * - Hangul Jamo medial vowels and final consonants (U+1160-U+11FF) 53 * have a column width of 0. 54 * 55 * - Spacing characters in the East Asian Wide (W) or East Asian 56 * FullWidth (F) category as defined in Unicode Technical 57 * Report #11 have a column width of 2. 58 * 59 * - All remaining characters (including all printable 60 * ISO 8859-1 and WGL4 characters, Unicode control characters, 61 * etc.) have a column width of 1. 62 * 63 * This implementation assumes that wchar_t characters are encoded 64 * in ISO 10646. 65 */ 66 67 int wcwidth(wchar_t ucs) 68 { 69 /* sorted list of non-overlapping intervals of non-spacing characters */ 70 static const struct interval combining[] = { 71 { 0x0300, 0x034E }, { 0x0360, 0x0362 }, { 0x0483, 0x0486 }, 72 { 0x0488, 0x0489 }, { 0x0591, 0x05A1 }, { 0x05A3, 0x05B9 }, 73 { 0x05BB, 0x05BD }, { 0x05BF, 0x05BF }, { 0x05C1, 0x05C2 }, 74 { 0x05C4, 0x05C4 }, { 0x064B, 0x0655 }, { 0x0670, 0x0670 }, 75 { 0x06D6, 0x06E4 }, { 0x06E7, 0x06E8 }, { 0x06EA, 0x06ED }, 76 { 0x070F, 0x070F }, { 0x0711, 0x0711 }, { 0x0730, 0x074A }, 77 { 0x07A6, 0x07B0 }, { 0x0901, 0x0902 }, { 0x093C, 0x093C }, 78 { 0x0941, 0x0948 }, { 0x094D, 0x094D }, { 0x0951, 0x0954 }, 79 { 0x0962, 0x0963 }, { 0x0981, 0x0981 }, { 0x09BC, 0x09BC }, 80 { 0x09C1, 0x09C4 }, { 0x09CD, 0x09CD }, { 0x09E2, 0x09E3 }, 81 { 0x0A02, 0x0A02 }, { 0x0A3C, 0x0A3C }, { 0x0A41, 0x0A42 }, 82 { 0x0A47, 0x0A48 }, { 0x0A4B, 0x0A4D }, { 0x0A70, 0x0A71 }, 83 { 0x0A81, 0x0A82 }, { 0x0ABC, 0x0ABC }, { 0x0AC1, 0x0AC5 }, 84 { 0x0AC7, 0x0AC8 }, { 0x0ACD, 0x0ACD }, { 0x0B01, 0x0B01 }, 85 { 0x0B3C, 0x0B3C }, { 0x0B3F, 0x0B3F }, { 0x0B41, 0x0B43 }, 86 { 0x0B4D, 0x0B4D }, { 0x0B56, 0x0B56 }, { 0x0B82, 0x0B82 }, 87 { 0x0BC0, 0x0BC0 }, { 0x0BCD, 0x0BCD }, { 0x0C3E, 0x0C40 }, 88 { 0x0C46, 0x0C48 }, { 0x0C4A, 0x0C4D }, { 0x0C55, 0x0C56 }, 89 { 0x0CBF, 0x0CBF }, { 0x0CC6, 0x0CC6 }, { 0x0CCC, 0x0CCD }, 90 { 0x0D41, 0x0D43 }, { 0x0D4D, 0x0D4D }, { 0x0DCA, 0x0DCA }, 91 { 0x0DD2, 0x0DD4 }, { 0x0DD6, 0x0DD6 }, { 0x0E31, 0x0E31 }, 92 { 0x0E34, 0x0E3A }, { 0x0E47, 0x0E4E }, { 0x0EB1, 0x0EB1 }, 93 { 0x0EB4, 0x0EB9 }, { 0x0EBB, 0x0EBC }, { 0x0EC8, 0x0ECD }, 94 { 0x0F18, 0x0F19 }, { 0x0F35, 0x0F35 }, { 0x0F37, 0x0F37 }, 95 { 0x0F39, 0x0F39 }, { 0x0F71, 0x0F7E }, { 0x0F80, 0x0F84 }, 96 { 0x0F86, 0x0F87 }, { 0x0F90, 0x0F97 }, { 0x0F99, 0x0FBC }, 97 { 0x0FC6, 0x0FC6 }, { 0x102D, 0x1030 }, { 0x1032, 0x1032 }, 98 { 0x1036, 0x1037 }, { 0x1039, 0x1039 }, { 0x1058, 0x1059 }, 99 { 0x1160, 0x11FF }, { 0x17B7, 0x17BD }, { 0x17C6, 0x17C6 }, 100 { 0x17C9, 0x17D3 }, { 0x180B, 0x180E }, { 0x18A9, 0x18A9 }, 101 { 0x200B, 0x200F }, { 0x202A, 0x202E }, { 0x206A, 0x206F }, 102 { 0x20D0, 0x20E3 }, { 0x302A, 0x302F }, { 0x3099, 0x309A }, 103 { 0xFB1E, 0xFB1E }, { 0xFE20, 0xFE23 }, { 0xFEFF, 0xFEFF }, 104 { 0xFFF9, 0xFFFB } 105 }; 106 107 /* test for 8-bit control characters */ 108 if (ucs == 0) 109 return 0; 110 if (ucs < 32 || (ucs >= 0x7f && ucs < 0xa0)) 111 return -1; 112 113 /* binary search in table of non-spacing characters */ 114 if (bisearch(ucs, combining, 115 sizeof(combining) / sizeof(struct interval) - 1)) 116 return 0; 117 118 /* if we arrive here, ucs is not a combining or C0/C1 control character */ 119 120 return 1 + 121 (ucs >= 0x1100 && 122 (ucs <= 0x115f || /* Hangul Jamo init. consonants */ 123 (ucs >= 0x2e80 && ucs <= 0xa4cf && (ucs & ~0x0011) != 0x300a && 124 ucs != 0x303f) || /* CJK ... Yi */ 125 (ucs >= 0xac00 && ucs <= 0xd7a3) || /* Hangul Syllables */ 126 (ucs >= 0xf900 && ucs <= 0xfaff) || /* CJK Compatibility Ideographs */ 127 (ucs >= 0xfe30 && ucs <= 0xfe6f) || /* CJK Compatibility Forms */ 128 (ucs >= 0xff00 && ucs <= 0xff5f) || /* Fullwidth Forms */ 129 (ucs >= 0xffe0 && ucs <= 0xffe6) || 130 (ucs >= 0x20000 && ucs <= 0x2ffff))); 131 } 132 133 134 int wcswidth(const wchar_t *pwcs, size_t n) 135 { 136 int w, width = 0; 137 138 for (;*pwcs && n-- > 0; pwcs++) 139 if ((w = wcwidth(*pwcs)) < 0) 140 return -1; 141 else 142 width += w; 143 144 return width; 145 } 146 147 148 /* 149 * The following function is the same as wcwidth(), except that 150 * spacing characters in the East Asian Ambiguous (A) category as 151 * defined in Unicode Technical Report #11 have a column width of 2. 152 * This experimental variant might be useful for users of CJK legacy 153 * encodings who want to migrate to UCS. It is not otherwise 154 * recommended for general use. 155 */ 156 static int wcwidth_cjk(wchar_t ucs) 157 { 158 /* sorted list of non-overlapping intervals of East Asian Ambiguous 159 * characters */ 160 static const struct interval ambiguous[] = { 161 { 0x00A1, 0x00A1 }, { 0x00A4, 0x00A4 }, { 0x00A7, 0x00A8 }, 162 { 0x00AA, 0x00AA }, { 0x00AD, 0x00AE }, { 0x00B0, 0x00B4 }, 163 { 0x00B6, 0x00BA }, { 0x00BC, 0x00BF }, { 0x00C6, 0x00C6 }, 164 { 0x00D0, 0x00D0 }, { 0x00D7, 0x00D8 }, { 0x00DE, 0x00E1 }, 165 { 0x00E6, 0x00E6 }, { 0x00E8, 0x00EA }, { 0x00EC, 0x00ED }, 166 { 0x00F0, 0x00F0 }, { 0x00F2, 0x00F3 }, { 0x00F7, 0x00FA }, 167 { 0x00FC, 0x00FC }, { 0x00FE, 0x00FE }, { 0x0101, 0x0101 }, 168 { 0x0111, 0x0111 }, { 0x0113, 0x0113 }, { 0x011B, 0x011B }, 169 { 0x0126, 0x0127 }, { 0x012B, 0x012B }, { 0x0131, 0x0133 }, 170 { 0x0138, 0x0138 }, { 0x013F, 0x0142 }, { 0x0144, 0x0144 }, 171 { 0x0148, 0x014B }, { 0x014D, 0x014D }, { 0x0152, 0x0153 }, 172 { 0x0166, 0x0167 }, { 0x016B, 0x016B }, { 0x01CE, 0x01CE }, 173 { 0x01D0, 0x01D0 }, { 0x01D2, 0x01D2 }, { 0x01D4, 0x01D4 }, 174 { 0x01D6, 0x01D6 }, { 0x01D8, 0x01D8 }, { 0x01DA, 0x01DA }, 175 { 0x01DC, 0x01DC }, { 0x0251, 0x0251 }, { 0x0261, 0x0261 }, 176 { 0x02C4, 0x02C4 }, { 0x02C7, 0x02C7 }, { 0x02C9, 0x02CB }, 177 { 0x02CD, 0x02CD }, { 0x02D0, 0x02D0 }, { 0x02D8, 0x02DB }, 178 { 0x02DD, 0x02DD }, { 0x02DF, 0x02DF }, { 0x0300, 0x034E }, 179 { 0x0360, 0x0362 }, { 0x0391, 0x03A1 }, { 0x03A3, 0x03A9 }, 180 { 0x03B1, 0x03C1 }, { 0x03C3, 0x03C9 }, { 0x0401, 0x0401 }, 181 { 0x0410, 0x044F }, { 0x0451, 0x0451 }, { 0x2010, 0x2010 }, 182 { 0x2013, 0x2016 }, { 0x2018, 0x2019 }, { 0x201C, 0x201D }, 183 { 0x2020, 0x2022 }, { 0x2024, 0x2027 }, { 0x2030, 0x2030 }, 184 { 0x2032, 0x2033 }, { 0x2035, 0x2035 }, { 0x203B, 0x203B }, 185 { 0x203E, 0x203E }, { 0x2074, 0x2074 }, { 0x207F, 0x207F }, 186 { 0x2081, 0x2084 }, { 0x20AC, 0x20AC }, { 0x2103, 0x2103 }, 187 { 0x2105, 0x2105 }, { 0x2109, 0x2109 }, { 0x2113, 0x2113 }, 188 { 0x2116, 0x2116 }, { 0x2121, 0x2122 }, { 0x2126, 0x2126 }, 189 { 0x212B, 0x212B }, { 0x2153, 0x2155 }, { 0x215B, 0x215E }, 190 { 0x2160, 0x216B }, { 0x2170, 0x2179 }, { 0x2190, 0x2199 }, 191 { 0x21B8, 0x21B9 }, { 0x21D2, 0x21D2 }, { 0x21D4, 0x21D4 }, 192 { 0x21E7, 0x21E7 }, { 0x2200, 0x2200 }, { 0x2202, 0x2203 }, 193 { 0x2207, 0x2208 }, { 0x220B, 0x220B }, { 0x220F, 0x220F }, 194 { 0x2211, 0x2211 }, { 0x2215, 0x2215 }, { 0x221A, 0x221A }, 195 { 0x221D, 0x2220 }, { 0x2223, 0x2223 }, { 0x2225, 0x2225 }, 196 { 0x2227, 0x222C }, { 0x222E, 0x222E }, { 0x2234, 0x2237 }, 197 { 0x223C, 0x223D }, { 0x2248, 0x2248 }, { 0x224C, 0x224C }, 198 { 0x2252, 0x2252 }, { 0x2260, 0x2261 }, { 0x2264, 0x2267 }, 199 { 0x226A, 0x226B }, { 0x226E, 0x226F }, { 0x2282, 0x2283 }, 200 { 0x2286, 0x2287 }, { 0x2295, 0x2295 }, { 0x2299, 0x2299 }, 201 { 0x22A5, 0x22A5 }, { 0x22BF, 0x22BF }, { 0x2312, 0x2312 }, 202 { 0x2329, 0x232A }, { 0x2460, 0x24BF }, { 0x24D0, 0x24E9 }, 203 { 0x2500, 0x254B }, { 0x2550, 0x2574 }, { 0x2580, 0x258F }, 204 { 0x2592, 0x2595 }, { 0x25A0, 0x25A1 }, { 0x25A3, 0x25A9 }, 205 { 0x25B2, 0x25B3 }, { 0x25B6, 0x25B7 }, { 0x25BC, 0x25BD }, 206 { 0x25C0, 0x25C1 }, { 0x25C6, 0x25C8 }, { 0x25CB, 0x25CB }, 207 { 0x25CE, 0x25D1 }, { 0x25E2, 0x25E5 }, { 0x25EF, 0x25EF }, 208 { 0x2605, 0x2606 }, { 0x2609, 0x2609 }, { 0x260E, 0x260F }, 209 { 0x261C, 0x261C }, { 0x261E, 0x261E }, { 0x2640, 0x2640 }, 210 { 0x2642, 0x2642 }, { 0x2660, 0x2661 }, { 0x2663, 0x2665 }, 211 { 0x2667, 0x266A }, { 0x266C, 0x266D }, { 0x266F, 0x266F }, 212 { 0x273D, 0x273D }, { 0x3008, 0x300B }, { 0x3014, 0x3015 }, 213 { 0x3018, 0x301B }, { 0xFFFD, 0xFFFD } 214 }; 215 216 /* binary search in table of non-spacing characters */ 217 if (bisearch(ucs, ambiguous, 218 sizeof(ambiguous) / sizeof(struct interval) - 1)) 219 return 2; 220 221 return wcwidth(ucs); 222 } 223 224 225 int wcswidth_cjk(const wchar_t *pwcs, size_t n) 226 { 227 int w, width = 0; 228 229 for (;*pwcs && n-- > 0; pwcs++) 230 if ((w = wcwidth_cjk(*pwcs)) < 0) 231 return -1; 232 else 233 width += w; 234 235 return width; 236 } 237