diff options
Diffstat (limited to 'libbb/unicode.c')
| -rw-r--r-- | libbb/unicode.c | 434 |
1 files changed, 427 insertions, 7 deletions
diff --git a/libbb/unicode.c b/libbb/unicode.c index bc9714562..83e70b412 100644 --- a/libbb/unicode.c +++ b/libbb/unicode.c @@ -14,12 +14,12 @@ uint8_t unicode_status; #endif -/* This file is compiled only if FEATURE_ASSUME_UNICODE is on. +/* This file is compiled only if UNICODE_SUPPORT is on. * We check other options and decide whether to use libc support * via locale, or use our own logic: */ -#if ENABLE_LOCALE_SUPPORT +#if ENABLE_UNICODE_USING_LOCALE /* Unicode support using libc locale support. */ @@ -139,7 +139,7 @@ size_t FAST_FUNC wcstombs(char *dest, const wchar_t *src, size_t n) return org_n - n; } -#define ERROR_WCHAR (~(wchar_t)0) +# define ERROR_WCHAR (~(wchar_t)0) static const char *mbstowc_internal(wchar_t *res, const char *src) { @@ -239,7 +239,427 @@ int FAST_FUNC iswpunct(wint_t wc) return (unsigned)wc <= 0x7f && ispunct(wc); } -#include "unicode_wcwidth.c" + +# if LAST_SUPPORTED_WCHAR >= 0x300 +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; +} +# endif + + +/* + * 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 + */ + +/* Assigned Unicode character ranges: + * Plane Range + * 0 0000–FFFF Basic Multilingual Plane + * 1 10000–1FFFF Supplementary Multilingual Plane + * 2 20000–2FFFF Supplementary Ideographic Plane + * 3 30000-3FFFF Tertiary Ideographic Plane (no chars assigned yet) + * 4-13 40000–DFFFF currently unassigned + * 14 E0000–EFFFF Supplementary Special-purpose Plane + * 15 F0000–FFFFF Supplementary Private Use Area-A + * 16 100000–10FFFF Supplementary Private Use Area-B + * + * "Supplementary Special-purpose Plane currently contains non-graphical + * characters in two blocks of 128 and 240 characters. The first block + * is for language tag characters for use when language cannot be indicated + * through other protocols (such as the xml:lang attribute in XML). + * The other block contains glyph variation selectors to indicate + * an alternate glyph for a character that cannot be determined by context." + * + * In simpler terms: it is a tool to fix the "Han unification" mess + * created by Unicode committee, to select Chinese/Japanese/Korean/Taiwan + * version of a character. (They forgot that the whole purpose of the Unicode + * was to be able to write all chars in one charset without such tricks). + * Until East Asian users say it is actually necessary to support these + * code points in console applications like busybox + * (i.e. do these chars ever appear in filenames, hostnames, text files + * and such?), we are treating these code points as invalid. + * + * Tertiary Ideographic Plane is also ignored for now, + * until Unicode committee assigns something there. + */ +/* 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) +{ +# if LAST_SUPPORTED_WCHAR >= 0x300 + /* 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) +# define ARRAY /* 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: */ \ + BIG_(0xA806, 0xA806) \ + BIG_(0xA80B, 0xA80B) \ + BIG_(0xA825, 0xA826) \ + BIG_(0xFB1E, 0xFB1E) \ + BIG_(0xFE00, 0xFE0F) \ + BIG_(0xFE20, 0xFE23) \ + BIG_(0xFEFF, 0xFEFF) \ + BIG_(0xFFF9, 0xFFFB) + ARRAY +# undef BIG_ +# undef PAIR + }; +# define BIG_(a,b) +# define PAIR(a,b) (a << 2) | (b-a), + static const uint16_t combining1[] = { ARRAY }; +# undef BIG_ +# undef PAIR +# define BIG_(a,b) char big_##a[b < 0x4000 && b-a <= 3 ? -1 : 1]; +# define PAIR(a,b) char pair##a[b >= 0x4000 || b-a > 3 ? -1 : 1]; + struct CHECK { ARRAY }; +# undef BIG_ +# undef PAIR +# undef ARRAY +# endif + + if (ucs == 0) + return 0; + + /* Test for 8-bit control characters (00-1f, 80-9f, 7f) */ + if ((ucs & ~0x80) < 0x20 || ucs == 0x7f) + return -1; + /* Quick abort if it is an obviously invalid char */ + if (ucs > LAST_SUPPORTED_WCHAR) + return -1; + + /* Optimization: no combining chars below 0x300 */ + if (LAST_SUPPORTED_WCHAR < 0x300 || ucs < 0x300) + return 1; + +# if LAST_SUPPORTED_WCHAR >= 0x300 + /* 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; + + /* Optimization: all chars below 0x1100 are not double-width */ + if (LAST_SUPPORTED_WCHAR < 0x1100 || ucs < 0x1100) + return 1; + +# if LAST_SUPPORTED_WCHAR >= 0x1100 + /* Invalid code points: */ + /* High (d800..dbff) and low (dc00..dfff) surrogates (valid only in UTF16) */ + /* Private Use Area (e000..f8ff) */ + /* Noncharacters fdd0..fdef */ + if ((LAST_SUPPORTED_WCHAR >= 0xd800 && ucs >= 0xd800 && ucs <= 0xf8ff) + || (LAST_SUPPORTED_WCHAR >= 0xfdd0 && ucs >= 0xfdd0 && ucs <= 0xfdef) + ) { + return -1; + } + /* 0xfffe and 0xffff in every plane are invalid */ + if (LAST_SUPPORTED_WCHAR >= 0xfffe && ((ucs & 0xfffe) == 0xfffe)) { + return -1; + } + +# if LAST_SUPPORTED_WCHAR >= 0x10000 + if (ucs >= 0x10000) { + /* Combining chars in Supplementary Multilingual Plane 0x1xxxx */ + 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 } + }; + /* Binary search in table of non-spacing characters in Supplementary Multilingual Plane */ + if (in_interval_table(ucs ^ 0x10000, combining0x10000, ARRAY_SIZE(combining0x10000) - 1)) + return 0; + /* Check a few non-spacing chars in Supplementary Special-purpose Plane 0xExxxx */ + if (LAST_SUPPORTED_WCHAR >= 0xE0001 + && ( ucs == 0xE0001 + || (ucs >= 0xE0020 && ucs <= 0xE007F) + || (ucs >= 0xE0100 && ucs <= 0xE01EF) + ) + ) { + return 0; + } + } +# endif + + /* If we arrive here, ucs is not a combining or C0/C1 control character. + * Check whether it's 1 char or 2-shar wide. + */ + return 1 + + ( (/*ucs >= 0x1100 &&*/ ucs <= 0x115f) /* Hangul Jamo init. consonants */ + || ucs == 0x2329 /* left-pointing angle bracket; also CJK punct. char */ + || ucs == 0x232a /* right-pointing angle bracket; also CJK punct. char */ + || (ucs >= 0x2e80 && ucs <= 0xa4cf && ucs != 0x303f) /* CJK ... Yi */ +# if LAST_SUPPORTED_WCHAR >= 0xac00 + || (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 >> 17) == (2 >> 1)) /* 20000..3ffff: Supplementary and Tertiary Ideographic Planes */ +# endif + ); +# endif /* >= 0x1100 */ +# endif /* >= 0x300 */ +} + # if ENABLE_UNICODE_BIDI_SUPPORT int FAST_FUNC unicode_bidi_isrtl(wint_t wc) @@ -592,7 +1012,7 @@ static char* FAST_FUNC unicode_conv_to_printable2(uni_stat_t *stats, const char int w; wchar_t wc; -#if ENABLE_LOCALE_SUPPORT +#if ENABLE_UNICODE_USING_LOCALE { mbstate_t mbst = { 0 }; ssize_t rc = mbsrtowcs(&wc, &src, 1, &mbst); @@ -647,7 +1067,7 @@ static char* FAST_FUNC unicode_conv_to_printable2(uni_stat_t *stats, const char uni_count++; uni_width += w; dst = xrealloc(dst, dst_len + MB_CUR_MAX); -#if ENABLE_LOCALE_SUPPORT +#if ENABLE_UNICODE_USING_LOCALE { mbstate_t mbst = { 0 }; dst_len += wcrtomb(&dst[dst_len], wc, &mbst); @@ -699,7 +1119,7 @@ unsigned FAST_FUNC unicode_padding_to_width(unsigned width, const char *src) int w; wchar_t wc; -#if ENABLE_LOCALE_SUPPORT +#if ENABLE_UNICODE_USING_LOCALE { mbstate_t mbst = { 0 }; ssize_t rc = mbsrtowcs(&wc, &src, 1, &mbst); |