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authorDenys Vlasenko <vda.linux@googlemail.com>2010-03-26 14:06:56 +0100
committerDenys Vlasenko <vda.linux@googlemail.com>2010-03-26 14:06:56 +0100
commit19158a837df5093a2d655536424412bac2b07467 (patch)
tree3f3ce9c808e05dbf8dd38292f4c2db52cb73b429 /libbb/unicode.c
parentaa167556cd2954bb9a9fb0a005178462087a4600 (diff)
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unicode: s/FEATURE_ASSUME_UNICODE/UNICODE_SUPPORT, add UNICODE_USING_LOCALE
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'libbb/unicode.c')
-rw-r--r--libbb/unicode.c434
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 @@
14uint8_t unicode_status; 14uint8_t unicode_status;
15#endif 15#endif
16 16
17/* This file is compiled only if FEATURE_ASSUME_UNICODE is on. 17/* This file is compiled only if UNICODE_SUPPORT is on.
18 * We check other options and decide whether to use libc support 18 * We check other options and decide whether to use libc support
19 * via locale, or use our own logic: 19 * via locale, or use our own logic:
20 */ 20 */
21 21
22#if ENABLE_LOCALE_SUPPORT 22#if ENABLE_UNICODE_USING_LOCALE
23 23
24/* Unicode support using libc locale support. */ 24/* Unicode support using libc locale support. */
25 25
@@ -139,7 +139,7 @@ size_t FAST_FUNC wcstombs(char *dest, const wchar_t *src, size_t n)
139 return org_n - n; 139 return org_n - n;
140} 140}
141 141
142#define ERROR_WCHAR (~(wchar_t)0) 142# define ERROR_WCHAR (~(wchar_t)0)
143 143
144static const char *mbstowc_internal(wchar_t *res, const char *src) 144static const char *mbstowc_internal(wchar_t *res, const char *src)
145{ 145{
@@ -239,7 +239,427 @@ int FAST_FUNC iswpunct(wint_t wc)
239 return (unsigned)wc <= 0x7f && ispunct(wc); 239 return (unsigned)wc <= 0x7f && ispunct(wc);
240} 240}
241 241
242#include "unicode_wcwidth.c" 242
243# if LAST_SUPPORTED_WCHAR >= 0x300
244struct interval {
245 uint16_t first;
246 uint16_t last;
247};
248
249/* auxiliary function for binary search in interval table */
250static int in_interval_table(unsigned ucs, const struct interval *table, unsigned max)
251{
252 unsigned min;
253 unsigned mid;
254
255 if (ucs < table[0].first || ucs > table[max].last)
256 return 0;
257
258 min = 0;
259 while (max >= min) {
260 mid = (min + max) / 2;
261 if (ucs > table[mid].last)
262 min = mid + 1;
263 else if (ucs < table[mid].first)
264 max = mid - 1;
265 else
266 return 1;
267 }
268 return 0;
269}
270
271static int in_uint16_table(unsigned ucs, const uint16_t *table, unsigned max)
272{
273 unsigned min;
274 unsigned mid;
275 unsigned first, last;
276
277 first = table[0] >> 2;
278 last = first + (table[0] & 3);
279 if (ucs < first || ucs > last)
280 return 0;
281
282 min = 0;
283 while (max >= min) {
284 mid = (min + max) / 2;
285 first = table[mid] >> 2;
286 last = first + (table[mid] & 3);
287 if (ucs > last)
288 min = mid + 1;
289 else if (ucs < first)
290 max = mid - 1;
291 else
292 return 1;
293 }
294 return 0;
295}
296# endif
297
298
299/*
300 * This is an implementation of wcwidth() and wcswidth() (defined in
301 * IEEE Std 1002.1-2001) for Unicode.
302 *
303 * http://www.opengroup.org/onlinepubs/007904975/functions/wcwidth.html
304 * http://www.opengroup.org/onlinepubs/007904975/functions/wcswidth.html
305 *
306 * In fixed-width output devices, Latin characters all occupy a single
307 * "cell" position of equal width, whereas ideographic CJK characters
308 * occupy two such cells. Interoperability between terminal-line
309 * applications and (teletype-style) character terminals using the
310 * UTF-8 encoding requires agreement on which character should advance
311 * the cursor by how many cell positions. No established formal
312 * standards exist at present on which Unicode character shall occupy
313 * how many cell positions on character terminals. These routines are
314 * a first attempt of defining such behavior based on simple rules
315 * applied to data provided by the Unicode Consortium.
316 *
317 * For some graphical characters, the Unicode standard explicitly
318 * defines a character-cell width via the definition of the East Asian
319 * FullWidth (F), Wide (W), Half-width (H), and Narrow (Na) classes.
320 * In all these cases, there is no ambiguity about which width a
321 * terminal shall use. For characters in the East Asian Ambiguous (A)
322 * class, the width choice depends purely on a preference of backward
323 * compatibility with either historic CJK or Western practice.
324 * Choosing single-width for these characters is easy to justify as
325 * the appropriate long-term solution, as the CJK practice of
326 * displaying these characters as double-width comes from historic
327 * implementation simplicity (8-bit encoded characters were displayed
328 * single-width and 16-bit ones double-width, even for Greek,
329 * Cyrillic, etc.) and not any typographic considerations.
330 *
331 * Much less clear is the choice of width for the Not East Asian
332 * (Neutral) class. Existing practice does not dictate a width for any
333 * of these characters. It would nevertheless make sense
334 * typographically to allocate two character cells to characters such
335 * as for instance EM SPACE or VOLUME INTEGRAL, which cannot be
336 * represented adequately with a single-width glyph. The following
337 * routines at present merely assign a single-cell width to all
338 * neutral characters, in the interest of simplicity. This is not
339 * entirely satisfactory and should be reconsidered before
340 * establishing a formal standard in this area. At the moment, the
341 * decision which Not East Asian (Neutral) characters should be
342 * represented by double-width glyphs cannot yet be answered by
343 * applying a simple rule from the Unicode database content. Setting
344 * up a proper standard for the behavior of UTF-8 character terminals
345 * will require a careful analysis not only of each Unicode character,
346 * but also of each presentation form, something the author of these
347 * routines has avoided to do so far.
348 *
349 * http://www.unicode.org/unicode/reports/tr11/
350 *
351 * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
352 *
353 * Permission to use, copy, modify, and distribute this software
354 * for any purpose and without fee is hereby granted. The author
355 * disclaims all warranties with regard to this software.
356 *
357 * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
358 */
359
360/* Assigned Unicode character ranges:
361 * Plane Range
362 * 0 0000–FFFF Basic Multilingual Plane
363 * 1 10000–1FFFF Supplementary Multilingual Plane
364 * 2 20000–2FFFF Supplementary Ideographic Plane
365 * 3 30000-3FFFF Tertiary Ideographic Plane (no chars assigned yet)
366 * 4-13 40000–DFFFF currently unassigned
367 * 14 E0000–EFFFF Supplementary Special-purpose Plane
368 * 15 F0000–FFFFF Supplementary Private Use Area-A
369 * 16 100000–10FFFF Supplementary Private Use Area-B
370 *
371 * "Supplementary Special-purpose Plane currently contains non-graphical
372 * characters in two blocks of 128 and 240 characters. The first block
373 * is for language tag characters for use when language cannot be indicated
374 * through other protocols (such as the xml:lang attribute in XML).
375 * The other block contains glyph variation selectors to indicate
376 * an alternate glyph for a character that cannot be determined by context."
377 *
378 * In simpler terms: it is a tool to fix the "Han unification" mess
379 * created by Unicode committee, to select Chinese/Japanese/Korean/Taiwan
380 * version of a character. (They forgot that the whole purpose of the Unicode
381 * was to be able to write all chars in one charset without such tricks).
382 * Until East Asian users say it is actually necessary to support these
383 * code points in console applications like busybox
384 * (i.e. do these chars ever appear in filenames, hostnames, text files
385 * and such?), we are treating these code points as invalid.
386 *
387 * Tertiary Ideographic Plane is also ignored for now,
388 * until Unicode committee assigns something there.
389 */
390/* The following two functions define the column width of an ISO 10646
391 * character as follows:
392 *
393 * - The null character (U+0000) has a column width of 0.
394 *
395 * - Other C0/C1 control characters and DEL will lead to a return
396 * value of -1.
397 *
398 * - Non-spacing and enclosing combining characters (general
399 * category code Mn or Me in the Unicode database) have a
400 * column width of 0.
401 *
402 * - SOFT HYPHEN (U+00AD) has a column width of 1.
403 *
404 * - Other format characters (general category code Cf in the Unicode
405 * database) and ZERO WIDTH SPACE (U+200B) have a column width of 0.
406 *
407 * - Hangul Jamo medial vowels and final consonants (U+1160-U+11FF)
408 * have a column width of 0.
409 *
410 * - Spacing characters in the East Asian Wide (W) or East Asian
411 * Full-width (F) category as defined in Unicode Technical
412 * Report #11 have a column width of 2.
413 *
414 * - All remaining characters (including all printable
415 * ISO 8859-1 and WGL4 characters, Unicode control characters,
416 * etc.) have a column width of 1.
417 *
418 * This implementation assumes that wchar_t characters are encoded
419 * in ISO 10646.
420 */
421static int wcwidth(unsigned ucs)
422{
423# if LAST_SUPPORTED_WCHAR >= 0x300
424 /* sorted list of non-overlapping intervals of non-spacing characters */
425 /* generated by "uniset +cat=Me +cat=Mn +cat=Cf -00AD +1160-11FF +200B c" */
426 static const struct interval combining[] = {
427# define BIG_(a,b) { a, b },
428# define PAIR(a,b)
429# define ARRAY /* PAIR if < 0x4000 and no more than 4 chars big */ \
430 BIG_(0x0300, 0x036F) \
431 PAIR(0x0483, 0x0486) \
432 PAIR(0x0488, 0x0489) \
433 BIG_(0x0591, 0x05BD) \
434 PAIR(0x05BF, 0x05BF) \
435 PAIR(0x05C1, 0x05C2) \
436 PAIR(0x05C4, 0x05C5) \
437 PAIR(0x05C7, 0x05C7) \
438 PAIR(0x0600, 0x0603) \
439 BIG_(0x0610, 0x0615) \
440 BIG_(0x064B, 0x065E) \
441 PAIR(0x0670, 0x0670) \
442 BIG_(0x06D6, 0x06E4) \
443 PAIR(0x06E7, 0x06E8) \
444 PAIR(0x06EA, 0x06ED) \
445 PAIR(0x070F, 0x070F) \
446 PAIR(0x0711, 0x0711) \
447 BIG_(0x0730, 0x074A) \
448 BIG_(0x07A6, 0x07B0) \
449 BIG_(0x07EB, 0x07F3) \
450 PAIR(0x0901, 0x0902) \
451 PAIR(0x093C, 0x093C) \
452 BIG_(0x0941, 0x0948) \
453 PAIR(0x094D, 0x094D) \
454 PAIR(0x0951, 0x0954) \
455 PAIR(0x0962, 0x0963) \
456 PAIR(0x0981, 0x0981) \
457 PAIR(0x09BC, 0x09BC) \
458 PAIR(0x09C1, 0x09C4) \
459 PAIR(0x09CD, 0x09CD) \
460 PAIR(0x09E2, 0x09E3) \
461 PAIR(0x0A01, 0x0A02) \
462 PAIR(0x0A3C, 0x0A3C) \
463 PAIR(0x0A41, 0x0A42) \
464 PAIR(0x0A47, 0x0A48) \
465 PAIR(0x0A4B, 0x0A4D) \
466 PAIR(0x0A70, 0x0A71) \
467 PAIR(0x0A81, 0x0A82) \
468 PAIR(0x0ABC, 0x0ABC) \
469 BIG_(0x0AC1, 0x0AC5) \
470 PAIR(0x0AC7, 0x0AC8) \
471 PAIR(0x0ACD, 0x0ACD) \
472 PAIR(0x0AE2, 0x0AE3) \
473 PAIR(0x0B01, 0x0B01) \
474 PAIR(0x0B3C, 0x0B3C) \
475 PAIR(0x0B3F, 0x0B3F) \
476 PAIR(0x0B41, 0x0B43) \
477 PAIR(0x0B4D, 0x0B4D) \
478 PAIR(0x0B56, 0x0B56) \
479 PAIR(0x0B82, 0x0B82) \
480 PAIR(0x0BC0, 0x0BC0) \
481 PAIR(0x0BCD, 0x0BCD) \
482 PAIR(0x0C3E, 0x0C40) \
483 PAIR(0x0C46, 0x0C48) \
484 PAIR(0x0C4A, 0x0C4D) \
485 PAIR(0x0C55, 0x0C56) \
486 PAIR(0x0CBC, 0x0CBC) \
487 PAIR(0x0CBF, 0x0CBF) \
488 PAIR(0x0CC6, 0x0CC6) \
489 PAIR(0x0CCC, 0x0CCD) \
490 PAIR(0x0CE2, 0x0CE3) \
491 PAIR(0x0D41, 0x0D43) \
492 PAIR(0x0D4D, 0x0D4D) \
493 PAIR(0x0DCA, 0x0DCA) \
494 PAIR(0x0DD2, 0x0DD4) \
495 PAIR(0x0DD6, 0x0DD6) \
496 PAIR(0x0E31, 0x0E31) \
497 BIG_(0x0E34, 0x0E3A) \
498 BIG_(0x0E47, 0x0E4E) \
499 PAIR(0x0EB1, 0x0EB1) \
500 BIG_(0x0EB4, 0x0EB9) \
501 PAIR(0x0EBB, 0x0EBC) \
502 BIG_(0x0EC8, 0x0ECD) \
503 PAIR(0x0F18, 0x0F19) \
504 PAIR(0x0F35, 0x0F35) \
505 PAIR(0x0F37, 0x0F37) \
506 PAIR(0x0F39, 0x0F39) \
507 BIG_(0x0F71, 0x0F7E) \
508 BIG_(0x0F80, 0x0F84) \
509 PAIR(0x0F86, 0x0F87) \
510 PAIR(0x0FC6, 0x0FC6) \
511 BIG_(0x0F90, 0x0F97) \
512 BIG_(0x0F99, 0x0FBC) \
513 PAIR(0x102D, 0x1030) \
514 PAIR(0x1032, 0x1032) \
515 PAIR(0x1036, 0x1037) \
516 PAIR(0x1039, 0x1039) \
517 PAIR(0x1058, 0x1059) \
518 BIG_(0x1160, 0x11FF) \
519 PAIR(0x135F, 0x135F) \
520 PAIR(0x1712, 0x1714) \
521 PAIR(0x1732, 0x1734) \
522 PAIR(0x1752, 0x1753) \
523 PAIR(0x1772, 0x1773) \
524 PAIR(0x17B4, 0x17B5) \
525 BIG_(0x17B7, 0x17BD) \
526 PAIR(0x17C6, 0x17C6) \
527 BIG_(0x17C9, 0x17D3) \
528 PAIR(0x17DD, 0x17DD) \
529 PAIR(0x180B, 0x180D) \
530 PAIR(0x18A9, 0x18A9) \
531 PAIR(0x1920, 0x1922) \
532 PAIR(0x1927, 0x1928) \
533 PAIR(0x1932, 0x1932) \
534 PAIR(0x1939, 0x193B) \
535 PAIR(0x1A17, 0x1A18) \
536 PAIR(0x1B00, 0x1B03) \
537 PAIR(0x1B34, 0x1B34) \
538 BIG_(0x1B36, 0x1B3A) \
539 PAIR(0x1B3C, 0x1B3C) \
540 PAIR(0x1B42, 0x1B42) \
541 BIG_(0x1B6B, 0x1B73) \
542 BIG_(0x1DC0, 0x1DCA) \
543 PAIR(0x1DFE, 0x1DFF) \
544 BIG_(0x200B, 0x200F) \
545 BIG_(0x202A, 0x202E) \
546 PAIR(0x2060, 0x2063) \
547 BIG_(0x206A, 0x206F) \
548 BIG_(0x20D0, 0x20EF) \
549 BIG_(0x302A, 0x302F) \
550 PAIR(0x3099, 0x309A) \
551 /* Too big to be packed in PAIRs: */ \
552 BIG_(0xA806, 0xA806) \
553 BIG_(0xA80B, 0xA80B) \
554 BIG_(0xA825, 0xA826) \
555 BIG_(0xFB1E, 0xFB1E) \
556 BIG_(0xFE00, 0xFE0F) \
557 BIG_(0xFE20, 0xFE23) \
558 BIG_(0xFEFF, 0xFEFF) \
559 BIG_(0xFFF9, 0xFFFB)
560 ARRAY
561# undef BIG_
562# undef PAIR
563 };
564# define BIG_(a,b)
565# define PAIR(a,b) (a << 2) | (b-a),
566 static const uint16_t combining1[] = { ARRAY };
567# undef BIG_
568# undef PAIR
569# define BIG_(a,b) char big_##a[b < 0x4000 && b-a <= 3 ? -1 : 1];
570# define PAIR(a,b) char pair##a[b >= 0x4000 || b-a > 3 ? -1 : 1];
571 struct CHECK { ARRAY };
572# undef BIG_
573# undef PAIR
574# undef ARRAY
575# endif
576
577 if (ucs == 0)
578 return 0;
579
580 /* Test for 8-bit control characters (00-1f, 80-9f, 7f) */
581 if ((ucs & ~0x80) < 0x20 || ucs == 0x7f)
582 return -1;
583 /* Quick abort if it is an obviously invalid char */
584 if (ucs > LAST_SUPPORTED_WCHAR)
585 return -1;
586
587 /* Optimization: no combining chars below 0x300 */
588 if (LAST_SUPPORTED_WCHAR < 0x300 || ucs < 0x300)
589 return 1;
590
591# if LAST_SUPPORTED_WCHAR >= 0x300
592 /* Binary search in table of non-spacing characters */
593 if (in_interval_table(ucs, combining, ARRAY_SIZE(combining) - 1))
594 return 0;
595 if (in_uint16_table(ucs, combining1, ARRAY_SIZE(combining1) - 1))
596 return 0;
597
598 /* Optimization: all chars below 0x1100 are not double-width */
599 if (LAST_SUPPORTED_WCHAR < 0x1100 || ucs < 0x1100)
600 return 1;
601
602# if LAST_SUPPORTED_WCHAR >= 0x1100
603 /* Invalid code points: */
604 /* High (d800..dbff) and low (dc00..dfff) surrogates (valid only in UTF16) */
605 /* Private Use Area (e000..f8ff) */
606 /* Noncharacters fdd0..fdef */
607 if ((LAST_SUPPORTED_WCHAR >= 0xd800 && ucs >= 0xd800 && ucs <= 0xf8ff)
608 || (LAST_SUPPORTED_WCHAR >= 0xfdd0 && ucs >= 0xfdd0 && ucs <= 0xfdef)
609 ) {
610 return -1;
611 }
612 /* 0xfffe and 0xffff in every plane are invalid */
613 if (LAST_SUPPORTED_WCHAR >= 0xfffe && ((ucs & 0xfffe) == 0xfffe)) {
614 return -1;
615 }
616
617# if LAST_SUPPORTED_WCHAR >= 0x10000
618 if (ucs >= 0x10000) {
619 /* Combining chars in Supplementary Multilingual Plane 0x1xxxx */
620 static const struct interval combining0x10000[] = {
621 { 0x0A01, 0x0A03 }, { 0x0A05, 0x0A06 }, { 0x0A0C, 0x0A0F },
622 { 0x0A38, 0x0A3A }, { 0x0A3F, 0x0A3F }, { 0xD167, 0xD169 },
623 { 0xD173, 0xD182 }, { 0xD185, 0xD18B }, { 0xD1AA, 0xD1AD },
624 { 0xD242, 0xD244 }
625 };
626 /* Binary search in table of non-spacing characters in Supplementary Multilingual Plane */
627 if (in_interval_table(ucs ^ 0x10000, combining0x10000, ARRAY_SIZE(combining0x10000) - 1))
628 return 0;
629 /* Check a few non-spacing chars in Supplementary Special-purpose Plane 0xExxxx */
630 if (LAST_SUPPORTED_WCHAR >= 0xE0001
631 && ( ucs == 0xE0001
632 || (ucs >= 0xE0020 && ucs <= 0xE007F)
633 || (ucs >= 0xE0100 && ucs <= 0xE01EF)
634 )
635 ) {
636 return 0;
637 }
638 }
639# endif
640
641 /* If we arrive here, ucs is not a combining or C0/C1 control character.
642 * Check whether it's 1 char or 2-shar wide.
643 */
644 return 1 +
645 ( (/*ucs >= 0x1100 &&*/ ucs <= 0x115f) /* Hangul Jamo init. consonants */
646 || ucs == 0x2329 /* left-pointing angle bracket; also CJK punct. char */
647 || ucs == 0x232a /* right-pointing angle bracket; also CJK punct. char */
648 || (ucs >= 0x2e80 && ucs <= 0xa4cf && ucs != 0x303f) /* CJK ... Yi */
649# if LAST_SUPPORTED_WCHAR >= 0xac00
650 || (ucs >= 0xac00 && ucs <= 0xd7a3) /* Hangul Syllables */
651 || (ucs >= 0xf900 && ucs <= 0xfaff) /* CJK Compatibility Ideographs */
652 || (ucs >= 0xfe10 && ucs <= 0xfe19) /* Vertical forms */
653 || (ucs >= 0xfe30 && ucs <= 0xfe6f) /* CJK Compatibility Forms */
654 || (ucs >= 0xff00 && ucs <= 0xff60) /* Fullwidth Forms */
655 || (ucs >= 0xffe0 && ucs <= 0xffe6)
656 || ((ucs >> 17) == (2 >> 1)) /* 20000..3ffff: Supplementary and Tertiary Ideographic Planes */
657# endif
658 );
659# endif /* >= 0x1100 */
660# endif /* >= 0x300 */
661}
662
243 663
244# if ENABLE_UNICODE_BIDI_SUPPORT 664# if ENABLE_UNICODE_BIDI_SUPPORT
245int FAST_FUNC unicode_bidi_isrtl(wint_t wc) 665int 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
592 int w; 1012 int w;
593 wchar_t wc; 1013 wchar_t wc;
594 1014
595#if ENABLE_LOCALE_SUPPORT 1015#if ENABLE_UNICODE_USING_LOCALE
596 { 1016 {
597 mbstate_t mbst = { 0 }; 1017 mbstate_t mbst = { 0 };
598 ssize_t rc = mbsrtowcs(&wc, &src, 1, &mbst); 1018 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
647 uni_count++; 1067 uni_count++;
648 uni_width += w; 1068 uni_width += w;
649 dst = xrealloc(dst, dst_len + MB_CUR_MAX); 1069 dst = xrealloc(dst, dst_len + MB_CUR_MAX);
650#if ENABLE_LOCALE_SUPPORT 1070#if ENABLE_UNICODE_USING_LOCALE
651 { 1071 {
652 mbstate_t mbst = { 0 }; 1072 mbstate_t mbst = { 0 };
653 dst_len += wcrtomb(&dst[dst_len], wc, &mbst); 1073 dst_len += wcrtomb(&dst[dst_len], wc, &mbst);
@@ -699,7 +1119,7 @@ unsigned FAST_FUNC unicode_padding_to_width(unsigned width, const char *src)
699 int w; 1119 int w;
700 wchar_t wc; 1120 wchar_t wc;
701 1121
702#if ENABLE_LOCALE_SUPPORT 1122#if ENABLE_UNICODE_USING_LOCALE
703 { 1123 {
704 mbstate_t mbst = { 0 }; 1124 mbstate_t mbst = { 0 };
705 ssize_t rc = mbsrtowcs(&wc, &src, 1, &mbst); 1125 ssize_t rc = mbsrtowcs(&wc, &src, 1, &mbst);