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time: fix incorrect DST offset when using POSIX timezones without DST
[musl.git] / src / locale / iconv.c
blob3047c27b2e8b36561dd8feba244f274492be1693
1 #include <iconv.h>
2 #include <errno.h>
3 #include <wchar.h>
4 #include <string.h>
5 #include <stdlib.h>
6 #include <limits.h>
7 #include <stdint.h>
8 #include "locale_impl.h"
9
10 #define UTF_32BE 0300
11 #define UTF_16LE 0301
12 #define UTF_16BE 0302
13 #define UTF_32LE 0303
14 #define UCS2BE 0304
15 #define UCS2LE 0305
16 #define WCHAR_T 0306
17 #define US_ASCII 0307
18 #define UTF_8 0310
19 #define UTF_16 0312
20 #define UTF_32 0313
21 #define UCS2 0314
22 #define EUC_JP 0320
23 #define SHIFT_JIS 0321
24 #define ISO2022_JP 0322
25 #define GB18030 0330
26 #define GBK 0331
27 #define GB2312 0332
28 #define BIG5 0340
29 #define EUC_KR 0350
30
31 /* Definitions of charmaps. Each charmap consists of:
32 * 1. Empty-string-terminated list of null-terminated aliases.
33 * 2. Special type code or number of elided quads of entries.
34 * 3. Character table (size determined by field 2), consisting
35 * of 5 bytes for every 4 characters, interpreted as 10-bit
36 * indices into the legacy_chars table. */
37
38 static const unsigned char charmaps[] =
39 "utf8\0char\0\0\310"
40 "wchart\0\0\306"
41 "ucs2be\0\0\304"
42 "ucs2le\0\0\305"
43 "utf16be\0\0\302"
44 "utf16le\0\0\301"
45 "ucs4be\0utf32be\0\0\300"
46 "ucs4le\0utf32le\0\0\303"
47 "ascii\0usascii\0iso646\0iso646us\0\0\307"
48 "utf16\0\0\312"
49 "ucs4\0utf32\0\0\313"
50 "ucs2\0\0\314"
51 "eucjp\0\0\320"
52 "shiftjis\0sjis\0\0\321"
53 "iso2022jp\0\0\322"
54 "gb18030\0\0\330"
55 "gbk\0\0\331"
56 "gb2312\0\0\332"
57 "big5\0bigfive\0cp950\0big5hkscs\0\0\340"
58 "euckr\0ksc5601\0ksx1001\0cp949\0\0\350"
59 #include "codepages.h"
60 ;
61
62 /* Table of characters that appear in legacy 8-bit codepages,
63 * limited to 1024 slots (10 bit indices). The first 256 entries
64 * are elided since those characters are obviously all included. */
65 static const unsigned short legacy_chars[] = {
66 #include "legacychars.h"
67 };
68
69 static const unsigned short jis0208[84][94] = {
70 #include "jis0208.h"
71 };
72
73 static const unsigned short gb18030[126][190] = {
74 #include "gb18030.h"
75 };
76
77 static const unsigned short big5[89][157] = {
78 #include "big5.h"
79 };
80
81 static const unsigned short hkscs[] = {
82 #include "hkscs.h"
83 };
84
85 static const unsigned short ksc[93][94] = {
86 #include "ksc.h"
87 };
88
89 static const unsigned short rev_jis[] = {
90 #include "revjis.h"
91 };
92
93 static int fuzzycmp(const unsigned char *a, const unsigned char *b)
94 {
95 for (; *a && *b; a++, b++) {
96 while (*a && (*a|32U)-'a'>26 && *a-'0'>10U) a++;
97 if ((*a|32U) != *b) return 1;
98 }
99 return *a != *b;
100 }
101
102 static size_t find_charmap(const void *name)
103 {
104 const unsigned char *s;
105 if (!*(char *)name) name=charmaps; /* "utf8" */
106 for (s=charmaps; *s; ) {
107 if (!fuzzycmp(name, s)) {
108 for (; *s; s+=strlen((void *)s)+1);
109 return s+1-charmaps;
110 }
111 s += strlen((void *)s)+1;
112 if (!*s) {
113 if (s[1] > 0200) s+=2;
114 else s+=2+(64U-s[1])*5;
115 }
116 }
117 return -1;
118 }
119
120 struct stateful_cd {
121 iconv_t base_cd;
122 unsigned state;
123 };
124
125 static iconv_t combine_to_from(size_t t, size_t f)
126 {
127 return (void *)(f<<16 | t<<1 | 1);
128 }
129
130 static size_t extract_from(iconv_t cd)
131 {
132 return (size_t)cd >> 16;
133 }
134
135 static size_t extract_to(iconv_t cd)
136 {
137 return (size_t)cd >> 1 & 0x7fff;
138 }
139
140 iconv_t iconv_open(const char *to, const char *from)
141 {
142 size_t f, t;
143 struct stateful_cd *scd;
144
145 if ((t = find_charmap(to))==-1
146 || (f = find_charmap(from))==-1
147 || (charmaps[t] >= 0330)) {
148 errno = EINVAL;
149 return (iconv_t)-1;
150 }
151 iconv_t cd = combine_to_from(t, f);
152
153 switch (charmaps[f]) {
154 case UTF_16:
155 case UTF_32:
156 case UCS2:
157 case ISO2022_JP:
158 scd = malloc(sizeof *scd);
159 if (!scd) return (iconv_t)-1;
160 scd->base_cd = cd;
161 scd->state = 0;
162 cd = (iconv_t)scd;
163 }
164
165 return cd;
166 }
167
168 static unsigned get_16(const unsigned char *s, int e)
169 {
170 e &= 1;
171 return s[e]<<8 | s[1-e];
172 }
173
174 static void put_16(unsigned char *s, unsigned c, int e)
175 {
176 e &= 1;
177 s[e] = c>>8;
178 s[1-e] = c;
179 }
180
181 static unsigned get_32(const unsigned char *s, int e)
182 {
183 e &= 3;
184 return s[e]+0U<<24 | s[e^1]<<16 | s[e^2]<<8 | s[e^3];
185 }
186
187 static void put_32(unsigned char *s, unsigned c, int e)
188 {
189 e &= 3;
190 s[e^0] = c>>24;
191 s[e^1] = c>>16;
192 s[e^2] = c>>8;
193 s[e^3] = c;
194 }
195
196 /* Adapt as needed */
197 #define mbrtowc_utf8 mbrtowc
198 #define wctomb_utf8 wctomb
199
200 static unsigned legacy_map(const unsigned char *map, unsigned c)
201 {
202 if (c < 4*map[-1]) return c;
203 unsigned x = c - 4*map[-1];
204 x = map[x*5/4]>>2*x%8 | map[x*5/4+1]<<8-2*x%8 & 1023;
205 return x < 256 ? x : legacy_chars[x-256];
206 }
207
208 static unsigned uni_to_jis(unsigned c)
209 {
210 unsigned nel = sizeof rev_jis / sizeof *rev_jis;
211 unsigned d, j, i, b = 0;
212 for (;;) {
213 i = nel/2;
214 j = rev_jis[b+i];
215 d = jis0208[j/256][j%256];
216 if (d==c) return j + 0x2121;
217 else if (nel == 1) return 0;
218 else if (c < d)
219 nel /= 2;
220 else {
221 b += i;
222 nel -= nel/2;
223 }
224 }
225 }
226
227 size_t iconv(iconv_t cd, char **restrict in, size_t *restrict inb, char **restrict out, size_t *restrict outb)
228 {
229 size_t x=0;
230 struct stateful_cd *scd=0;
231 if (!((size_t)cd & 1)) {
232 scd = (void *)cd;
233 cd = scd->base_cd;
234 }
235 unsigned to = extract_to(cd);
236 unsigned from = extract_from(cd);
237 const unsigned char *map = charmaps+from+1;
238 const unsigned char *tomap = charmaps+to+1;
239 mbstate_t st = {0};
240 wchar_t wc;
241 unsigned c, d;
242 size_t k, l;
243 int err;
244 unsigned char type = map[-1];
245 unsigned char totype = tomap[-1];
246 locale_t *ploc = &CURRENT_LOCALE, loc = *ploc;
247
248 if (!in || !*in || !*inb) return 0;
249
250 *ploc = UTF8_LOCALE;
251
252 for (; *inb; *in+=l, *inb-=l) {
253 c = *(unsigned char *)*in;
254 l = 1;
255
256 switch (type) {
257 case UTF_8:
258 if (c < 128) break;
259 l = mbrtowc_utf8(&wc, *in, *inb, &st);
260 if (l == (size_t)-1) goto ilseq;
261 if (l == (size_t)-2) goto starved;
262 c = wc;
263 break;
264 case US_ASCII:
265 if (c >= 128) goto ilseq;
266 break;
267 case WCHAR_T:
268 l = sizeof(wchar_t);
269 if (*inb < l) goto starved;
270 c = *(wchar_t *)*in;
271 if (0) {
272 case UTF_32BE:
273 case UTF_32LE:
274 l = 4;
275 if (*inb < 4) goto starved;
276 c = get_32((void *)*in, type);
277 }
278 if (c-0xd800u < 0x800u || c >= 0x110000u) goto ilseq;
279 break;
280 case UCS2BE:
281 case UCS2LE:
282 case UTF_16BE:
283 case UTF_16LE:
284 l = 2;
285 if (*inb < 2) goto starved;
286 c = get_16((void *)*in, type);
287 if ((unsigned)(c-0xdc00) < 0x400) goto ilseq;
288 if ((unsigned)(c-0xd800) < 0x400) {
289 if (type-UCS2BE < 2U) goto ilseq;
290 l = 4;
291 if (*inb < 4) goto starved;
292 d = get_16((void *)(*in + 2), type);
293 if ((unsigned)(d-0xdc00) >= 0x400) goto ilseq;
294 c = ((c-0xd7c0)<<10) + (d-0xdc00);
295 }
296 break;
297 case UCS2:
298 case UTF_16:
299 l = 0;
300 if (!scd->state) {
301 if (*inb < 2) goto starved;
302 c = get_16((void *)*in, 0);
303 scd->state = type==UCS2
304 ? c==0xfffe ? UCS2LE : UCS2BE
305 : c==0xfffe ? UTF_16LE : UTF_16BE;
306 if (c == 0xfffe || c == 0xfeff)
307 l = 2;
308 }
309 type = scd->state;
310 continue;
311 case UTF_32:
312 l = 0;
313 if (!scd->state) {
314 if (*inb < 4) goto starved;
315 c = get_32((void *)*in, 0);
316 scd->state = c==0xfffe0000 ? UTF_32LE : UTF_32BE;
317 if (c == 0xfffe0000 || c == 0xfeff)
318 l = 4;
319 }
320 type = scd->state;
321 continue;
322 case SHIFT_JIS:
323 if (c < 128) break;
324 if (c-0xa1 <= 0xdf-0xa1) {
325 c += 0xff61-0xa1;
326 break;
327 }
328 l = 2;
329 if (*inb < 2) goto starved;
330 d = *((unsigned char *)*in + 1);
331 if (c-129 <= 159-129) c -= 129;
332 else if (c-224 <= 239-224) c -= 193;
333 else goto ilseq;
334 c *= 2;
335 if (d-64 <= 158-64) {
336 if (d==127) goto ilseq;
337 if (d>127) d--;
338 d -= 64;
339 } else if (d-159 <= 252-159) {
340 c++;
341 d -= 159;
342 }
343 c = jis0208[c][d];
344 if (!c) goto ilseq;
345 break;
346 case EUC_JP:
347 if (c < 128) break;
348 l = 2;
349 if (*inb < 2) goto starved;
350 d = *((unsigned char *)*in + 1);
351 if (c==0x8e) {
352 c = d;
353 if (c-0xa1 > 0xdf-0xa1) goto ilseq;
354 c += 0xff61 - 0xa1;
355 break;
356 }
357 c -= 0xa1;
358 d -= 0xa1;
359 if (c >= 84 || d >= 94) goto ilseq;
360 c = jis0208[c][d];
361 if (!c) goto ilseq;
362 break;
363 case ISO2022_JP:
364 if (c >= 128) goto ilseq;
365 if (c == '\033') {
366 l = 3;
367 if (*inb < 3) goto starved;
368 c = *((unsigned char *)*in + 1);
369 d = *((unsigned char *)*in + 2);
370 if (c != '(' && c != '$') goto ilseq;
371 switch (128*(c=='$') + d) {
372 case 'B': scd->state=0; continue;
373 case 'J': scd->state=1; continue;
374 case 'I': scd->state=4; continue;
375 case 128+'@': scd->state=2; continue;
376 case 128+'B': scd->state=3; continue;
377 }
378 goto ilseq;
379 }
380 switch (scd->state) {
381 case 1:
382 if (c=='\\') c = 0xa5;
383 if (c=='~') c = 0x203e;
384 break;
385 case 2:
386 case 3:
387 l = 2;
388 if (*inb < 2) goto starved;
389 d = *((unsigned char *)*in + 1);
390 c -= 0x21;
391 d -= 0x21;
392 if (c >= 84 || d >= 94) goto ilseq;
393 c = jis0208[c][d];
394 if (!c) goto ilseq;
395 break;
396 case 4:
397 if (c-0x60 < 0x1f) goto ilseq;
398 if (c-0x21 < 0x5e) c += 0xff61-0x21;
399 break;
400 }
401 break;
402 case GB2312:
403 if (c < 128) break;
404 if (c < 0xa1) goto ilseq;
405 case GBK:
406 case GB18030:
407 if (c < 128) break;
408 c -= 0x81;
409 if (c >= 126) goto ilseq;
410 l = 2;
411 if (*inb < 2) goto starved;
412 d = *((unsigned char *)*in + 1);
413 if (d < 0xa1 && type == GB2312) goto ilseq;
414 if (d-0x40>=191 || d==127) {
415 if (d-'0'>9 || type != GB18030)
416 goto ilseq;
417 l = 4;
418 if (*inb < 4) goto starved;
419 c = (10*c + d-'0') * 1260;
420 d = *((unsigned char *)*in + 2);
421 if (d-0x81>126) goto ilseq;
422 c += 10*(d-0x81);
423 d = *((unsigned char *)*in + 3);
424 if (d-'0'>9) goto ilseq;
425 c += d-'0';
426 c += 128;
427 for (d=0; d<=c; ) {
428 k = 0;
429 for (int i=0; i<126; i++)
430 for (int j=0; j<190; j++)
431 if (gb18030[i][j]-d <= c-d)
432 k++;
433 d = c+1;
434 c += k;
435 }
436 break;
437 }
438 d -= 0x40;
439 if (d>63) d--;
440 c = gb18030[c][d];
441 break;
442 case BIG5:
443 if (c < 128) break;
444 l = 2;
445 if (*inb < 2) goto starved;
446 d = *((unsigned char *)*in + 1);
447 if (d-0x40>=0xff-0x40 || d-0x7f<0xa1-0x7f) goto ilseq;
448 d -= 0x40;
449 if (d > 0x3e) d -= 0x22;
450 if (c-0xa1>=0xfa-0xa1) {
451 if (c-0x87>=0xff-0x87) goto ilseq;
452 if (c < 0xa1) c -= 0x87;
453 else c -= 0x87 + (0xfa-0xa1);
454 c = (hkscs[4867+(c*157+d)/16]>>(c*157+d)%16)%2<<17
455 | hkscs[c*157+d];
456 /* A few HKSCS characters map to pairs of UCS
457 * characters. These are mapped to surrogate
458 * range in the hkscs table then hard-coded
459 * here. Ugly, yes. */
460 if (c/256 == 0xdc) {
461 union {
462 char c[8];
463 wchar_t wc[2];
464 } tmp;
465 char *ptmp = tmp.c;
466 size_t tmpx = iconv(combine_to_from(to, find_charmap("utf8")),
467 &(char *){"\303\212\314\204"
468 "\303\212\314\214"
469 "\303\252\314\204"
470 "\303\252\314\214"
471 +c%256}, &(size_t){4},
472 &ptmp, &(size_t){sizeof tmp});
473 size_t tmplen = ptmp - tmp.c;
474 if (tmplen > *outb) goto toobig;
475 if (tmpx) x++;
476 memcpy(*out, &tmp, tmplen);
477 *out += tmplen;
478 *outb -= tmplen;
479 continue;
480 }
481 if (!c) goto ilseq;
482 break;
483 }
484 c -= 0xa1;
485 c = big5[c][d]|(c==0x27&&(d==0x3a||d==0x3c||d==0x42))<<17;
486 if (!c) goto ilseq;
487 break;
488 case EUC_KR:
489 if (c < 128) break;
490 l = 2;
491 if (*inb < 2) goto starved;
492 d = *((unsigned char *)*in + 1);
493 c -= 0xa1;
494 d -= 0xa1;
495 if (c >= 93 || d >= 94) {
496 c += (0xa1-0x81);
497 d += 0xa1;
498 if (c >= 93 || c>=0xc6-0x81 && d>0x52)
499 goto ilseq;
500 if (d-'A'<26) d = d-'A';
501 else if (d-'a'<26) d = d-'a'+26;
502 else if (d-0x81<0xff-0x81) d = d-0x81+52;
503 else goto ilseq;
504 if (c < 0x20) c = 178*c + d;
505 else c = 178*0x20 + 84*(c-0x20) + d;
506 c += 0xac00;
507 for (d=0xac00; d<=c; ) {
508 k = 0;
509 for (int i=0; i<93; i++)
510 for (int j=0; j<94; j++)
511 if (ksc[i][j]-d <= c-d)
512 k++;
513 d = c+1;
514 c += k;
515 }
516 break;
517 }
518 c = ksc[c][d];
519 if (!c) goto ilseq;
520 break;
521 default:
522 if (!c) break;
523 c = legacy_map(map, c);
524 if (!c) goto ilseq;
525 }
526
527 switch (totype) {
528 case WCHAR_T:
529 if (*outb < sizeof(wchar_t)) goto toobig;
530 *(wchar_t *)*out = c;
531 *out += sizeof(wchar_t);
532 *outb -= sizeof(wchar_t);
533 break;
534 case UTF_8:
535 if (*outb < 4) {
536 char tmp[4];
537 k = wctomb_utf8(tmp, c);
538 if (*outb < k) goto toobig;
539 memcpy(*out, tmp, k);
540 } else k = wctomb_utf8(*out, c);
541 *out += k;
542 *outb -= k;
543 break;
544 case US_ASCII:
545 if (c > 0x7f) subst: x++, c='*';
546 default:
547 if (*outb < 1) goto toobig;
548 if (c<256 && c==legacy_map(tomap, c)) {
549 revout:
550 if (*outb < 1) goto toobig;
551 *(*out)++ = c;
552 *outb -= 1;
553 break;
554 }
555 d = c;
556 for (c=4*totype; c<256; c++) {
557 if (d == legacy_map(tomap, c)) {
558 goto revout;
559 }
560 }
561 goto subst;
562 case SHIFT_JIS:
563 if (c < 128) goto revout;
564 if (c == 0xa5) {
565 x++;
566 c = '\\';
567 goto revout;
568 }
569 if (c == 0x203e) {
570 x++;
571 c = '~';
572 goto revout;
573 }
574 if (c-0xff61 <= 0xdf-0xa1) {
575 c += 0xa1 - 0xff61;
576 goto revout;
577 }
578 c = uni_to_jis(c);
579 if (!c) goto subst;
580 if (*outb < 2) goto toobig;
581 d = c%256;
582 c = c/256;
583 *(*out)++ = (c+1)/2 + (c<95 ? 112 : 176);
584 *(*out)++ = c%2 ? d + 31 + d/96 : d + 126;
585 *outb -= 2;
586 break;
587 case EUC_JP:
588 if (c < 128) goto revout;
589 if (c-0xff61 <= 0xdf-0xa1) {
590 c += 0x0e00 + 0x21 - 0xff61;
591 } else {
592 c = uni_to_jis(c);
593 }
594 if (!c) goto subst;
595 if (*outb < 2) goto toobig;
596 *(*out)++ = c/256 + 0x80;
597 *(*out)++ = c%256 + 0x80;
598 *outb -= 2;
599 break;
600 case ISO2022_JP:
601 if (c < 128) goto revout;
602 if (c-0xff61 <= 0xdf-0xa1 || c==0xa5 || c==0x203e) {
603 if (*outb < 7) goto toobig;
604 *(*out)++ = '\033';
605 *(*out)++ = '(';
606 if (c==0xa5) {
607 *(*out)++ = 'J';
608 *(*out)++ = '\\';
609 } else if (c==0x203e) {
610 *(*out)++ = 'J';
611 *(*out)++ = '~';
612 } else {
613 *(*out)++ = 'I';
614 *(*out)++ = c-0xff61+0x21;
615 }
616 *(*out)++ = '\033';
617 *(*out)++ = '(';
618 *(*out)++ = 'B';
619 *outb -= 7;
620 break;
621 }
622 c = uni_to_jis(c);
623 if (!c) goto subst;
624 if (*outb < 8) goto toobig;
625 *(*out)++ = '\033';
626 *(*out)++ = '$';
627 *(*out)++ = 'B';
628 *(*out)++ = c/256;
629 *(*out)++ = c%256;
630 *(*out)++ = '\033';
631 *(*out)++ = '(';
632 *(*out)++ = 'B';
633 *outb -= 8;
634 break;
635 case UCS2:
636 totype = UCS2BE;
637 case UCS2BE:
638 case UCS2LE:
639 case UTF_16:
640 case UTF_16BE:
641 case UTF_16LE:
642 if (c < 0x10000 || totype-UCS2BE < 2U) {
643 if (c >= 0x10000) c = 0xFFFD;
644 if (*outb < 2) goto toobig;
645 put_16((void *)*out, c, totype);
646 *out += 2;
647 *outb -= 2;
648 break;
649 }
650 if (*outb < 4) goto toobig;
651 c -= 0x10000;
652 put_16((void *)*out, (c>>10)|0xd800, totype);
653 put_16((void *)(*out + 2), (c&0x3ff)|0xdc00, totype);
654 *out += 4;
655 *outb -= 4;
656 break;
657 case UTF_32:
658 totype = UTF_32BE;
659 case UTF_32BE:
660 case UTF_32LE:
661 if (*outb < 4) goto toobig;
662 put_32((void *)*out, c, totype);
663 *out += 4;
664 *outb -= 4;
665 break;
666 }
667 }
668 *ploc = loc;
669 return x;
670 ilseq:
671 err = EILSEQ;
672 x = -1;
673 goto end;
674 toobig:
675 err = E2BIG;
676 x = -1;
677 goto end;
678 starved:
679 err = EINVAL;
680 x = -1;
681 end:
682 errno = err;
683 *ploc = loc;
684 return x;
685 }
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