19b934d09SEd Schouten /* 29b934d09SEd Schouten * Markus Kuhn -- 2007-05-26 (Unicode 5.0) 39b934d09SEd Schouten * 49b934d09SEd Schouten * Permission to use, copy, modify, and distribute this software 59b934d09SEd Schouten * for any purpose and without fee is hereby granted. The author 69b934d09SEd Schouten * disclaims all warranties with regard to this software. 79b934d09SEd Schouten * 89b934d09SEd Schouten * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c 99b934d09SEd Schouten */ 109b934d09SEd Schouten 119e589b09SBojan Novković #define TEKEN_UTF8_INVALID_CODEPOINT -1 129e589b09SBojan Novković 139b934d09SEd Schouten struct interval { 149b934d09SEd Schouten teken_char_t first; 159b934d09SEd Schouten teken_char_t last; 169b934d09SEd Schouten }; 179b934d09SEd Schouten 189b934d09SEd Schouten /* auxiliary function for binary search in interval table */ 199b934d09SEd Schouten static int bisearch(teken_char_t ucs, const struct interval *table, int max) { 209b934d09SEd Schouten int min = 0; 219b934d09SEd Schouten int mid; 229b934d09SEd Schouten 239b934d09SEd Schouten if (ucs < table[0].first || ucs > table[max].last) 249b934d09SEd Schouten return 0; 259b934d09SEd Schouten while (max >= min) { 269b934d09SEd Schouten mid = (min + max) / 2; 279b934d09SEd Schouten if (ucs > table[mid].last) 289b934d09SEd Schouten min = mid + 1; 299b934d09SEd Schouten else if (ucs < table[mid].first) 309b934d09SEd Schouten max = mid - 1; 319b934d09SEd Schouten else 329b934d09SEd Schouten return 1; 339b934d09SEd Schouten } 349b934d09SEd Schouten 359b934d09SEd Schouten return 0; 369b934d09SEd Schouten } 379b934d09SEd Schouten 389b934d09SEd Schouten static int teken_wcwidth(teken_char_t ucs) 399b934d09SEd Schouten { 409b934d09SEd Schouten /* sorted list of non-overlapping intervals of non-spacing characters */ 419b934d09SEd Schouten /* generated by "uniset +cat=Me +cat=Mn +cat=Cf -00AD +1160-11FF +200B c" */ 429b934d09SEd Schouten static const struct interval combining[] = { 439b934d09SEd Schouten { 0x0300, 0x036F }, { 0x0483, 0x0486 }, { 0x0488, 0x0489 }, 449b934d09SEd Schouten { 0x0591, 0x05BD }, { 0x05BF, 0x05BF }, { 0x05C1, 0x05C2 }, 459b934d09SEd Schouten { 0x05C4, 0x05C5 }, { 0x05C7, 0x05C7 }, { 0x0600, 0x0603 }, 469b934d09SEd Schouten { 0x0610, 0x0615 }, { 0x064B, 0x065E }, { 0x0670, 0x0670 }, 479b934d09SEd Schouten { 0x06D6, 0x06E4 }, { 0x06E7, 0x06E8 }, { 0x06EA, 0x06ED }, 489b934d09SEd Schouten { 0x070F, 0x070F }, { 0x0711, 0x0711 }, { 0x0730, 0x074A }, 499b934d09SEd Schouten { 0x07A6, 0x07B0 }, { 0x07EB, 0x07F3 }, { 0x0901, 0x0902 }, 509b934d09SEd Schouten { 0x093C, 0x093C }, { 0x0941, 0x0948 }, { 0x094D, 0x094D }, 519b934d09SEd Schouten { 0x0951, 0x0954 }, { 0x0962, 0x0963 }, { 0x0981, 0x0981 }, 529b934d09SEd Schouten { 0x09BC, 0x09BC }, { 0x09C1, 0x09C4 }, { 0x09CD, 0x09CD }, 539b934d09SEd Schouten { 0x09E2, 0x09E3 }, { 0x0A01, 0x0A02 }, { 0x0A3C, 0x0A3C }, 549b934d09SEd Schouten { 0x0A41, 0x0A42 }, { 0x0A47, 0x0A48 }, { 0x0A4B, 0x0A4D }, 559b934d09SEd Schouten { 0x0A70, 0x0A71 }, { 0x0A81, 0x0A82 }, { 0x0ABC, 0x0ABC }, 569b934d09SEd Schouten { 0x0AC1, 0x0AC5 }, { 0x0AC7, 0x0AC8 }, { 0x0ACD, 0x0ACD }, 579b934d09SEd Schouten { 0x0AE2, 0x0AE3 }, { 0x0B01, 0x0B01 }, { 0x0B3C, 0x0B3C }, 589b934d09SEd Schouten { 0x0B3F, 0x0B3F }, { 0x0B41, 0x0B43 }, { 0x0B4D, 0x0B4D }, 599b934d09SEd Schouten { 0x0B56, 0x0B56 }, { 0x0B82, 0x0B82 }, { 0x0BC0, 0x0BC0 }, 609b934d09SEd Schouten { 0x0BCD, 0x0BCD }, { 0x0C3E, 0x0C40 }, { 0x0C46, 0x0C48 }, 619b934d09SEd Schouten { 0x0C4A, 0x0C4D }, { 0x0C55, 0x0C56 }, { 0x0CBC, 0x0CBC }, 629b934d09SEd Schouten { 0x0CBF, 0x0CBF }, { 0x0CC6, 0x0CC6 }, { 0x0CCC, 0x0CCD }, 639b934d09SEd Schouten { 0x0CE2, 0x0CE3 }, { 0x0D41, 0x0D43 }, { 0x0D4D, 0x0D4D }, 649b934d09SEd Schouten { 0x0DCA, 0x0DCA }, { 0x0DD2, 0x0DD4 }, { 0x0DD6, 0x0DD6 }, 659b934d09SEd Schouten { 0x0E31, 0x0E31 }, { 0x0E34, 0x0E3A }, { 0x0E47, 0x0E4E }, 669b934d09SEd Schouten { 0x0EB1, 0x0EB1 }, { 0x0EB4, 0x0EB9 }, { 0x0EBB, 0x0EBC }, 679b934d09SEd Schouten { 0x0EC8, 0x0ECD }, { 0x0F18, 0x0F19 }, { 0x0F35, 0x0F35 }, 689b934d09SEd Schouten { 0x0F37, 0x0F37 }, { 0x0F39, 0x0F39 }, { 0x0F71, 0x0F7E }, 699b934d09SEd Schouten { 0x0F80, 0x0F84 }, { 0x0F86, 0x0F87 }, { 0x0F90, 0x0F97 }, 709b934d09SEd Schouten { 0x0F99, 0x0FBC }, { 0x0FC6, 0x0FC6 }, { 0x102D, 0x1030 }, 719b934d09SEd Schouten { 0x1032, 0x1032 }, { 0x1036, 0x1037 }, { 0x1039, 0x1039 }, 729b934d09SEd Schouten { 0x1058, 0x1059 }, { 0x1160, 0x11FF }, { 0x135F, 0x135F }, 739b934d09SEd Schouten { 0x1712, 0x1714 }, { 0x1732, 0x1734 }, { 0x1752, 0x1753 }, 749b934d09SEd Schouten { 0x1772, 0x1773 }, { 0x17B4, 0x17B5 }, { 0x17B7, 0x17BD }, 759b934d09SEd Schouten { 0x17C6, 0x17C6 }, { 0x17C9, 0x17D3 }, { 0x17DD, 0x17DD }, 769b934d09SEd Schouten { 0x180B, 0x180D }, { 0x18A9, 0x18A9 }, { 0x1920, 0x1922 }, 779b934d09SEd Schouten { 0x1927, 0x1928 }, { 0x1932, 0x1932 }, { 0x1939, 0x193B }, 789b934d09SEd Schouten { 0x1A17, 0x1A18 }, { 0x1B00, 0x1B03 }, { 0x1B34, 0x1B34 }, 799b934d09SEd Schouten { 0x1B36, 0x1B3A }, { 0x1B3C, 0x1B3C }, { 0x1B42, 0x1B42 }, 809b934d09SEd Schouten { 0x1B6B, 0x1B73 }, { 0x1DC0, 0x1DCA }, { 0x1DFE, 0x1DFF }, 819b934d09SEd Schouten { 0x200B, 0x200F }, { 0x202A, 0x202E }, { 0x2060, 0x2063 }, 829b934d09SEd Schouten { 0x206A, 0x206F }, { 0x20D0, 0x20EF }, { 0x302A, 0x302F }, 839b934d09SEd Schouten { 0x3099, 0x309A }, { 0xA806, 0xA806 }, { 0xA80B, 0xA80B }, 849b934d09SEd Schouten { 0xA825, 0xA826 }, { 0xFB1E, 0xFB1E }, { 0xFE00, 0xFE0F }, 859b934d09SEd Schouten { 0xFE20, 0xFE23 }, { 0xFEFF, 0xFEFF }, { 0xFFF9, 0xFFFB }, 869b934d09SEd Schouten { 0x10A01, 0x10A03 }, { 0x10A05, 0x10A06 }, { 0x10A0C, 0x10A0F }, 879b934d09SEd Schouten { 0x10A38, 0x10A3A }, { 0x10A3F, 0x10A3F }, { 0x1D167, 0x1D169 }, 889b934d09SEd Schouten { 0x1D173, 0x1D182 }, { 0x1D185, 0x1D18B }, { 0x1D1AA, 0x1D1AD }, 899b934d09SEd Schouten { 0x1D242, 0x1D244 }, { 0xE0001, 0xE0001 }, { 0xE0020, 0xE007F }, 909b934d09SEd Schouten { 0xE0100, 0xE01EF } 919b934d09SEd Schouten }; 929b934d09SEd Schouten 939b934d09SEd Schouten /* test for 8-bit control characters */ 949b934d09SEd Schouten if (ucs == 0) 959b934d09SEd Schouten return 0; 969b934d09SEd Schouten if (ucs < 32 || (ucs >= 0x7f && ucs < 0xa0)) 979b934d09SEd Schouten return -1; 989b934d09SEd Schouten 999b934d09SEd Schouten /* binary search in table of non-spacing characters */ 1009b934d09SEd Schouten if (bisearch(ucs, combining, 1019b934d09SEd Schouten sizeof(combining) / sizeof(struct interval) - 1)) 1029b934d09SEd Schouten return 0; 1039b934d09SEd Schouten 1049b934d09SEd Schouten /* if we arrive here, ucs is not a combining or C0/C1 control character */ 1059b934d09SEd Schouten 1069b934d09SEd Schouten return 1 + 1079b934d09SEd Schouten (ucs >= 0x1100 && 1089b934d09SEd Schouten (ucs <= 0x115f || /* Hangul Jamo init. consonants */ 1099b934d09SEd Schouten ucs == 0x2329 || ucs == 0x232a || 1109b934d09SEd Schouten (ucs >= 0x2e80 && ucs <= 0xa4cf && 1119b934d09SEd Schouten ucs != 0x303f) || /* CJK ... Yi */ 1129b934d09SEd Schouten (ucs >= 0xac00 && ucs <= 0xd7a3) || /* Hangul Syllables */ 1139b934d09SEd Schouten (ucs >= 0xf900 && ucs <= 0xfaff) || /* CJK Compatibility Ideographs */ 1149b934d09SEd Schouten (ucs >= 0xfe10 && ucs <= 0xfe19) || /* Vertical forms */ 1159b934d09SEd Schouten (ucs >= 0xfe30 && ucs <= 0xfe6f) || /* CJK Compatibility Forms */ 1169b934d09SEd Schouten (ucs >= 0xff00 && ucs <= 0xff60) || /* Fullwidth Forms */ 1179b934d09SEd Schouten (ucs >= 0xffe0 && ucs <= 0xffe6) || 1189b934d09SEd Schouten (ucs >= 0x20000 && ucs <= 0x2fffd) || 1199b934d09SEd Schouten (ucs >= 0x30000 && ucs <= 0x3fffd))); 1209b934d09SEd Schouten } 1219e589b09SBojan Novković 1229e589b09SBojan Novković /* 1239e589b09SBojan Novković * Converts an UTF-8 byte sequence to a codepoint as specified in 1249e589b09SBojan Novković * https://datatracker.ietf.org/doc/html/rfc3629#section-3 . The function 1259e589b09SBojan Novković * expects the 'bytes' array to start with the leading character. 1269e589b09SBojan Novković */ 1279e589b09SBojan Novković static teken_char_t 1289e589b09SBojan Novković teken_utf8_bytes_to_codepoint(uint8_t bytes[4], int nbytes) 1299e589b09SBojan Novković { 1309e589b09SBojan Novković 1319e589b09SBojan Novković /* Check for malformed characters. */ 1329e589b09SBojan Novković if (bitcount(bytes[0] & 0xf0) != nbytes) 1339e589b09SBojan Novković return (TEKEN_UTF8_INVALID_CODEPOINT); 1349e589b09SBojan Novković 1359e589b09SBojan Novković switch (nbytes) { 1369e589b09SBojan Novković case 1: 1379e589b09SBojan Novković return (bytes[0] & 0x7f); 1389e589b09SBojan Novković case 2: 1399e589b09SBojan Novković return (bytes[0] & 0xf) << 6 | (bytes[1] & 0x3f); 1409e589b09SBojan Novković case 3: 1419e589b09SBojan Novković return (bytes[0] & 0xf) << 12 | (bytes[1] & 0x3f) << 6 | (bytes[2] & 0x3f); 1429e589b09SBojan Novković case 4: 1439e589b09SBojan Novković return (bytes[0] & 0x7) << 18 | (bytes[1] & 0x3f) << 12 | 1449e589b09SBojan Novković (bytes[2] & 0x3f) << 6 | (bytes[3] & 0x3f); 1459e589b09SBojan Novković default: 1469e589b09SBojan Novković return (TEKEN_UTF8_INVALID_CODEPOINT); 1479e589b09SBojan Novković } 1489e589b09SBojan Novković } 149