/* * utf-8.c * Copyright (C) 2001 A.J. van Os; Released under GPL * *==================================================================== * This part of the software is based on: * An implementation of wcwidth() as defined in * "The Single UNIX Specification, Version 2, The Open Group, 1997" * * Markus Kuhn -- 2001-01-12 -- public domain *==================================================================== * The credit should go to him, but all the bugs are mine. */ #include #include #include "antiword.h" struct interval { unsigned short first; unsigned short last; }; /* Sorted list of non-overlapping intervals of non-spacing characters */ static const struct interval combining[] = { { 0x0300, 0x034E }, { 0x0360, 0x0362 }, { 0x0483, 0x0486 }, { 0x0488, 0x0489 }, { 0x0591, 0x05A1 }, { 0x05A3, 0x05B9 }, { 0x05BB, 0x05BD }, { 0x05BF, 0x05BF }, { 0x05C1, 0x05C2 }, { 0x05C4, 0x05C4 }, { 0x064B, 0x0655 }, { 0x0670, 0x0670 }, { 0x06D6, 0x06E4 }, { 0x06E7, 0x06E8 }, { 0x06EA, 0x06ED }, { 0x070F, 0x070F }, { 0x0711, 0x0711 }, { 0x0730, 0x074A }, { 0x07A6, 0x07B0 }, { 0x0901, 0x0902 }, { 0x093C, 0x093C }, { 0x0941, 0x0948 }, { 0x094D, 0x094D }, { 0x0951, 0x0954 }, { 0x0962, 0x0963 }, { 0x0981, 0x0981 }, { 0x09BC, 0x09BC }, { 0x09C1, 0x09C4 }, { 0x09CD, 0x09CD }, { 0x09E2, 0x09E3 }, { 0x0A02, 0x0A02 }, { 0x0A3C, 0x0A3C }, { 0x0A41, 0x0A42 }, { 0x0A47, 0x0A48 }, { 0x0A4B, 0x0A4D }, { 0x0A70, 0x0A71 }, { 0x0A81, 0x0A82 }, { 0x0ABC, 0x0ABC }, { 0x0AC1, 0x0AC5 }, { 0x0AC7, 0x0AC8 }, { 0x0ACD, 0x0ACD }, { 0x0B01, 0x0B01 }, { 0x0B3C, 0x0B3C }, { 0x0B3F, 0x0B3F }, { 0x0B41, 0x0B43 }, { 0x0B4D, 0x0B4D }, { 0x0B56, 0x0B56 }, { 0x0B82, 0x0B82 }, { 0x0BC0, 0x0BC0 }, { 0x0BCD, 0x0BCD }, { 0x0C3E, 0x0C40 }, { 0x0C46, 0x0C48 }, { 0x0C4A, 0x0C4D }, { 0x0C55, 0x0C56 }, { 0x0CBF, 0x0CBF }, { 0x0CC6, 0x0CC6 }, { 0x0CCC, 0x0CCD }, { 0x0D41, 0x0D43 }, { 0x0D4D, 0x0D4D }, { 0x0DCA, 0x0DCA }, { 0x0DD2, 0x0DD4 }, { 0x0DD6, 0x0DD6 }, { 0x0E31, 0x0E31 }, { 0x0E34, 0x0E3A }, { 0x0E47, 0x0E4E }, { 0x0EB1, 0x0EB1 }, { 0x0EB4, 0x0EB9 }, { 0x0EBB, 0x0EBC }, { 0x0EC8, 0x0ECD }, { 0x0F18, 0x0F19 }, { 0x0F35, 0x0F35 }, { 0x0F37, 0x0F37 }, { 0x0F39, 0x0F39 }, { 0x0F71, 0x0F7E }, { 0x0F80, 0x0F84 }, { 0x0F86, 0x0F87 }, { 0x0F90, 0x0F97 }, { 0x0F99, 0x0FBC }, { 0x0FC6, 0x0FC6 }, { 0x102D, 0x1030 }, { 0x1032, 0x1032 }, { 0x1036, 0x1037 }, { 0x1039, 0x1039 }, { 0x1058, 0x1059 }, { 0x1160, 0x11FF }, { 0x17B7, 0x17BD }, { 0x17C6, 0x17C6 }, { 0x17C9, 0x17D3 }, { 0x180B, 0x180E }, { 0x18A9, 0x18A9 }, { 0x200B, 0x200F }, { 0x202A, 0x202E }, { 0x206A, 0x206F }, { 0x20D0, 0x20E3 }, { 0x302A, 0x302F }, { 0x3099, 0x309A }, { 0xFB1E, 0xFB1E }, { 0xFE20, 0xFE23 }, { 0xFEFF, 0xFEFF }, { 0xFFF9, 0xFFFB } }; /* Auxiliary function for binary search in interval table */ static BOOL bIsZeroWidthChar(unsigned long ucs) { int low = 0; int high = elementsof(combining) - 1; int mid; if (ucs < combining[low].first || ucs > combining[high].last) { return FALSE; } while (high >= low) { mid = (low + high) / 2; if (ucs > combining[mid].last) { low = mid + 1; } else if (ucs < combining[mid].first) { high = mid - 1; } else { return TRUE; } } return FALSE; } /* end of bIsZeroWidthChar */ /* The following 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. * * - 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 * FullWidth (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 all characters are encoded * in ISO 10646. */ int wcwidth(unsigned long ucs) { /* Test for 8-bit control characters */ if (ucs == 0) { return 0; } if (ucs < 0x20 || (ucs >= 0x7f && ucs < 0xa0)) { return -1; } /* Binary search in table of non-spacing characters */ if (bIsZeroWidthChar(ucs)) { return 0; } /* Ucs is not a combining or C0/C1 control character */ return 1 + (ucs >= 0x1100 && (ucs <= 0x115f || /* Hangul Jamo init. consonants */ (ucs >= 0x2e80 && ucs <= 0xa4cf && (ucs & ~0x0011) != 0x300a && ucs != 0x303f) || /* CJK ... Yi */ (ucs >= 0xac00 && ucs <= 0xd7a3) || /* Hangul Syllables */ (ucs >= 0xf900 && ucs <= 0xfaff) || /* CJK Compatibility Ideographs */ (ucs >= 0xfe30 && ucs <= 0xfe6f) || /* CJK Compatibility Forms */ (ucs >= 0xff00 && ucs <= 0xff5f) || /* Fullwidth Forms */ (ucs >= 0xffe0 && ucs <= 0xffe6) || (ucs >= 0x20000 && ucs <= 0x2ffff))); } /* end of wcwidth */ #if 0 int wcswidth(const unsigned long *pwcs, size_t n) { int w, width = 0; for (;*pwcs && n-- > 0; pwcs++) { w = wcwidth(*pwcs); if (w < 0) { return -1; } width += w; } return width; } /* end of wcswidth */ #endif static unsigned long utf8_to_ucs(const char *p, int *utflen) { unsigned long wc = (unsigned long)(unsigned char)p[0]; int charlen; int j; if (wc < 0x80) { *utflen = 1; return wc; } if (wc < 0xe0){ charlen = 2; wc &= 0x1f; } else if (wc < 0xf0){ charlen = 3; wc &= 0x0f; } else if (wc < 0xf8){ charlen = 4; wc &= 0x07; } else if (wc < 0xfc){ charlen = 5; wc &= 0x03; } else { charlen = 6; wc &= 0x01; } for (j = 1; j < charlen; j++) { wc <<= 6; wc |= (unsigned char)p[j] & 0x3f; } *utflen = charlen; return wc; } /* end of utf8_to_ucs */ long utf8_strwidth(const char *p, int numchars) { const char *maxp; unsigned long ucs; long totlen; int utflen; totlen = 0; maxp = p + numchars; while (*p != '\0' && p < maxp) { ucs = utf8_to_ucs(p, &utflen); totlen += wcwidth(ucs); p += utflen; } return totlen; } /* end of utf8_strwidth */ /* * Original version: * Copyright (C) 1999 Bruno Haible */ BOOL is_locale_utf8(void) { const char *locale, *cp, *encoding; /* * Determine the current locale the same way as setlocale() does, * according to POSIX. */ locale = getenv("LC_ALL"); if (locale == NULL || locale[0] == '\0') { locale = getenv("LC_CTYPE"); if (locale == NULL || locale[0] == '\0') { locale = getenv("LANG"); } } if (locale == NULL || locale[0] == '\0') { return FALSE; } /* The most general syntax of a locale (not all optional parts * recognized by all systems) is * language[_territory][.codeset][@modifier][+special][,[sponsor][_revision]] * To retrieve the codeset, search the first dot. Stop searching when * a '@' or '+' or ',' is encountered. */ for (cp = locale; *cp != '\0' && *cp != '@' && *cp != '+' && *cp != ','; cp++) { if (*cp != '.') { continue; } encoding = cp + 1; for (cp = encoding; *cp != '\0' && *cp != '@' && *cp != '+' && *cp != ','; cp++) ; /* EMPTY */ /* * The encoding is now contained in the part from encoding to * cp. Check it for "UTF-8", which is the only official IANA * name of UTF-8. Also check for the lowercase-no-dashes * version, which is what some SystemV systems use. */ if ((cp - encoding == 5 && STRNEQ(encoding, "UTF-8", 5)) || (cp - encoding == 4 && STRNEQ(encoding, "utf8", 4))) { return TRUE; } return FALSE; } return FALSE; } /* end of is_locale_utf8 */