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syslog: revert LOG_FAC/LOG_FACMASK changes
[musl.git] / src / locale / iconv.c
blob7fb2e1efa1df54f882436fefe28968e683de120a
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\0cp932\0\0\321"
53 "iso2022jp\0\0\322"
54 "gb18030\0\0\330"
55 "gbk\0cp936\0windows936\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 if (c>=84) goto ilseq;
344 c = jis0208[c][d];
345 if (!c) goto ilseq;
346 break;
347 case EUC_JP:
348 if (c < 128) break;
349 l = 2;
350 if (*inb < 2) goto starved;
351 d = *((unsigned char *)*in + 1);
352 if (c==0x8e) {
353 c = d;
354 if (c-0xa1 > 0xdf-0xa1) goto ilseq;
355 c += 0xff61 - 0xa1;
356 break;
357 }
358 c -= 0xa1;
359 d -= 0xa1;
360 if (c >= 84 || d >= 94) goto ilseq;
361 c = jis0208[c][d];
362 if (!c) goto ilseq;
363 break;
364 case ISO2022_JP:
365 if (c >= 128) goto ilseq;
366 if (c == '\033') {
367 l = 3;
368 if (*inb < 3) goto starved;
369 c = *((unsigned char *)*in + 1);
370 d = *((unsigned char *)*in + 2);
371 if (c != '(' && c != '$') goto ilseq;
372 switch (128*(c=='$') + d) {
373 case 'B': scd->state=0; continue;
374 case 'J': scd->state=1; continue;
375 case 'I': scd->state=4; continue;
376 case 128+'@': scd->state=2; continue;
377 case 128+'B': scd->state=3; continue;
378 }
379 goto ilseq;
380 }
381 switch (scd->state) {
382 case 1:
383 if (c=='\\') c = 0xa5;
384 if (c=='~') c = 0x203e;
385 break;
386 case 2:
387 case 3:
388 l = 2;
389 if (*inb < 2) goto starved;
390 d = *((unsigned char *)*in + 1);
391 c -= 0x21;
392 d -= 0x21;
393 if (c >= 84 || d >= 94) goto ilseq;
394 c = jis0208[c][d];
395 if (!c) goto ilseq;
396 break;
397 case 4:
398 if (c-0x60 < 0x1f) goto ilseq;
399 if (c-0x21 < 0x5e) c += 0xff61-0x21;
400 break;
401 }
402 break;
403 case GB2312:
404 if (c < 128) break;
405 if (c < 0xa1) goto ilseq;
406 case GBK:
407 if (c == 128) {
408 c = 0x20ac;
409 break;
410 }
411 case GB18030:
412 if (c < 128) break;
413 c -= 0x81;
414 if (c >= 126) goto ilseq;
415 l = 2;
416 if (*inb < 2) goto starved;
417 d = *((unsigned char *)*in + 1);
418 if (d < 0xa1 && type == GB2312) goto ilseq;
419 if (d-0x40>=191 || d==127) {
420 if (d-'0'>9 || type != GB18030)
421 goto ilseq;
422 l = 4;
423 if (*inb < 4) goto starved;
424 c = (10*c + d-'0') * 1260;
425 d = *((unsigned char *)*in + 2);
426 if (d-0x81>126) goto ilseq;
427 c += 10*(d-0x81);
428 d = *((unsigned char *)*in + 3);
429 if (d-'0'>9) goto ilseq;
430 c += d-'0';
431 c += 128;
432 for (d=0; d<=c; ) {
433 k = 0;
434 for (int i=0; i<126; i++)
435 for (int j=0; j<190; j++)
436 if (gb18030[i][j]-d <= c-d)
437 k++;
438 d = c+1;
439 c += k;
440 }
441 break;
442 }
443 d -= 0x40;
444 if (d>63) d--;
445 c = gb18030[c][d];
446 break;
447 case BIG5:
448 if (c < 128) break;
449 l = 2;
450 if (*inb < 2) goto starved;
451 d = *((unsigned char *)*in + 1);
452 if (d-0x40>=0xff-0x40 || d-0x7f<0xa1-0x7f) goto ilseq;
453 d -= 0x40;
454 if (d > 0x3e) d -= 0x22;
455 if (c-0xa1>=0xfa-0xa1) {
456 if (c-0x87>=0xff-0x87) goto ilseq;
457 if (c < 0xa1) c -= 0x87;
458 else c -= 0x87 + (0xfa-0xa1);
459 c = (hkscs[4867+(c*157+d)/16]>>(c*157+d)%16)%2<<17
460 | hkscs[c*157+d];
461 /* A few HKSCS characters map to pairs of UCS
462 * characters. These are mapped to surrogate
463 * range in the hkscs table then hard-coded
464 * here. Ugly, yes. */
465 if (c/256 == 0xdc) {
466 union {
467 char c[8];
468 wchar_t wc[2];
469 } tmp;
470 char *ptmp = tmp.c;
471 size_t tmpx = iconv(combine_to_from(to, find_charmap("utf8")),
472 &(char *){"\303\212\314\204"
473 "\303\212\314\214"
474 "\303\252\314\204"
475 "\303\252\314\214"
476 +c%256}, &(size_t){4},
477 &ptmp, &(size_t){sizeof tmp});
478 size_t tmplen = ptmp - tmp.c;
479 if (tmplen > *outb) goto toobig;
480 if (tmpx) x++;
481 memcpy(*out, &tmp, tmplen);
482 *out += tmplen;
483 *outb -= tmplen;
484 continue;
485 }
486 if (!c) goto ilseq;
487 break;
488 }
489 c -= 0xa1;
490 c = big5[c][d]|(c==0x27&&(d==0x3a||d==0x3c||d==0x42))<<17;
491 if (!c) goto ilseq;
492 break;
493 case EUC_KR:
494 if (c < 128) break;
495 l = 2;
496 if (*inb < 2) goto starved;
497 d = *((unsigned char *)*in + 1);
498 c -= 0xa1;
499 d -= 0xa1;
500 if (c >= 93 || d >= 94) {
501 c += (0xa1-0x81);
502 d += 0xa1;
503 if (c >= 93 || c>=0xc6-0x81 && d>0x52)
504 goto ilseq;
505 if (d-'A'<26) d = d-'A';
506 else if (d-'a'<26) d = d-'a'+26;
507 else if (d-0x81<0xff-0x81) d = d-0x81+52;
508 else goto ilseq;
509 if (c < 0x20) c = 178*c + d;
510 else c = 178*0x20 + 84*(c-0x20) + d;
511 c += 0xac00;
512 for (d=0xac00; d<=c; ) {
513 k = 0;
514 for (int i=0; i<93; i++)
515 for (int j=0; j<94; j++)
516 if (ksc[i][j]-d <= c-d)
517 k++;
518 d = c+1;
519 c += k;
520 }
521 break;
522 }
523 c = ksc[c][d];
524 if (!c) goto ilseq;
525 break;
526 default:
527 if (!c) break;
528 c = legacy_map(map, c);
529 if (!c) goto ilseq;
530 }
531
532 switch (totype) {
533 case WCHAR_T:
534 if (*outb < sizeof(wchar_t)) goto toobig;
535 *(wchar_t *)*out = c;
536 *out += sizeof(wchar_t);
537 *outb -= sizeof(wchar_t);
538 break;
539 case UTF_8:
540 if (*outb < 4) {
541 char tmp[4];
542 k = wctomb_utf8(tmp, c);
543 if (*outb < k) goto toobig;
544 memcpy(*out, tmp, k);
545 } else k = wctomb_utf8(*out, c);
546 *out += k;
547 *outb -= k;
548 break;
549 case US_ASCII:
550 if (c > 0x7f) subst: x++, c='*';
551 default:
552 if (*outb < 1) goto toobig;
553 if (c<256 && c==legacy_map(tomap, c)) {
554 revout:
555 if (*outb < 1) goto toobig;
556 *(*out)++ = c;
557 *outb -= 1;
558 break;
559 }
560 d = c;
561 for (c=4*totype; c<256; c++) {
562 if (d == legacy_map(tomap, c)) {
563 goto revout;
564 }
565 }
566 goto subst;
567 case SHIFT_JIS:
568 if (c < 128) goto revout;
569 if (c == 0xa5) {
570 x++;
571 c = '\\';
572 goto revout;
573 }
574 if (c == 0x203e) {
575 x++;
576 c = '~';
577 goto revout;
578 }
579 if (c-0xff61 <= 0xdf-0xa1) {
580 c += 0xa1 - 0xff61;
581 goto revout;
582 }
583 c = uni_to_jis(c);
584 if (!c) goto subst;
585 if (*outb < 2) goto toobig;
586 d = c%256;
587 c = c/256;
588 *(*out)++ = (c+1)/2 + (c<95 ? 112 : 176);
589 *(*out)++ = c%2 ? d + 31 + d/96 : d + 126;
590 *outb -= 2;
591 break;
592 case EUC_JP:
593 if (c < 128) goto revout;
594 if (c-0xff61 <= 0xdf-0xa1) {
595 c += 0x0e00 + 0x21 - 0xff61;
596 } else {
597 c = uni_to_jis(c);
598 }
599 if (!c) goto subst;
600 if (*outb < 2) goto toobig;
601 *(*out)++ = c/256 + 0x80;
602 *(*out)++ = c%256 + 0x80;
603 *outb -= 2;
604 break;
605 case ISO2022_JP:
606 if (c < 128) goto revout;
607 if (c-0xff61 <= 0xdf-0xa1 || c==0xa5 || c==0x203e) {
608 if (*outb < 7) goto toobig;
609 *(*out)++ = '\033';
610 *(*out)++ = '(';
611 if (c==0xa5) {
612 *(*out)++ = 'J';
613 *(*out)++ = '\\';
614 } else if (c==0x203e) {
615 *(*out)++ = 'J';
616 *(*out)++ = '~';
617 } else {
618 *(*out)++ = 'I';
619 *(*out)++ = c-0xff61+0x21;
620 }
621 *(*out)++ = '\033';
622 *(*out)++ = '(';
623 *(*out)++ = 'B';
624 *outb -= 7;
625 break;
626 }
627 c = uni_to_jis(c);
628 if (!c) goto subst;
629 if (*outb < 8) goto toobig;
630 *(*out)++ = '\033';
631 *(*out)++ = '$';
632 *(*out)++ = 'B';
633 *(*out)++ = c/256;
634 *(*out)++ = c%256;
635 *(*out)++ = '\033';
636 *(*out)++ = '(';
637 *(*out)++ = 'B';
638 *outb -= 8;
639 break;
640 case UCS2:
641 totype = UCS2BE;
642 case UCS2BE:
643 case UCS2LE:
644 case UTF_16:
645 case UTF_16BE:
646 case UTF_16LE:
647 if (c < 0x10000 || totype-UCS2BE < 2U) {
648 if (c >= 0x10000) c = 0xFFFD;
649 if (*outb < 2) goto toobig;
650 put_16((void *)*out, c, totype);
651 *out += 2;
652 *outb -= 2;
653 break;
654 }
655 if (*outb < 4) goto toobig;
656 c -= 0x10000;
657 put_16((void *)*out, (c>>10)|0xd800, totype);
658 put_16((void *)(*out + 2), (c&0x3ff)|0xdc00, totype);
659 *out += 4;
660 *outb -= 4;
661 break;
662 case UTF_32:
663 totype = UTF_32BE;
664 case UTF_32BE:
665 case UTF_32LE:
666 if (*outb < 4) goto toobig;
667 put_32((void *)*out, c, totype);
668 *out += 4;
669 *outb -= 4;
670 break;
671 }
672 }
673 *ploc = loc;
674 return x;
675 ilseq:
676 err = EILSEQ;
677 x = -1;
678 goto end;
679 toobig:
680 err = E2BIG;
681 x = -1;
682 goto end;
683 starved:
684 err = EINVAL;
685 x = -1;
686 end:
687 errno = err;
688 *ploc = loc;
689 return x;
690 }
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