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when building for arm as thumb2 code, also request assembly as thumb
[musl.git] / src / locale / iconv.c
blob1eeea94e0a38753691269b978f105b5e65ee33b8
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 EUC_JP 0320
20 #define SHIFT_JIS 0321
21 #define GB18030 0330
22 #define GBK 0331
23 #define GB2312 0332
24 #define BIG5 0340
25 #define EUC_KR 0350
26
27 /* Definitions of charmaps. Each charmap consists of:
28 * 1. Empty-string-terminated list of null-terminated aliases.
29 * 2. Special type code or number of elided entries.
30 * 3. Character table (size determined by field 2). */
31
32 static const unsigned char charmaps[] =
33 "utf8\0char\0\0\310"
34 "wchart\0\0\306"
35 "ucs2\0ucs2be\0\0\304"
36 "ucs2le\0\0\305"
37 "utf16\0utf16be\0\0\302"
38 "utf16le\0\0\301"
39 "ucs4\0ucs4be\0utf32\0utf32be\0\0\300"
40 "ucs4le\0utf32le\0\0\303"
41 "ascii\0usascii\0iso646\0iso646us\0\0\307"
42 "eucjp\0\0\320"
43 "shiftjis\0sjis\0\0\321"
44 "gb18030\0\0\330"
45 "gbk\0\0\331"
46 "gb2312\0\0\332"
47 "big5\0bigfive\0cp950\0big5hkscs\0\0\340"
48 "euckr\0ksc5601\0ksx1001\0cp949\0\0\350"
49 #include "codepages.h"
50 ;
51
52 static const unsigned short legacy_chars[] = {
53 #include "legacychars.h"
54 };
55
56 static const unsigned short jis0208[84][94] = {
57 #include "jis0208.h"
58 };
59
60 static const unsigned short gb18030[126][190] = {
61 #include "gb18030.h"
62 };
63
64 static const unsigned short big5[89][157] = {
65 #include "big5.h"
66 };
67
68 static const unsigned short hkscs[] = {
69 #include "hkscs.h"
70 };
71
72 static const unsigned short ksc[93][94] = {
73 #include "ksc.h"
74 };
75
76 static int fuzzycmp(const unsigned char *a, const unsigned char *b)
77 {
78 for (; *a && *b; a++, b++) {
79 while (*a && (*a|32U)-'a'>26 && *a-'0'>10U) a++;
80 if ((*a|32U) != *b) return 1;
81 }
82 return *a != *b;
83 }
84
85 static size_t find_charmap(const void *name)
86 {
87 const unsigned char *s;
88 if (!*(char *)name) name=charmaps; /* "utf8" */
89 for (s=charmaps; *s; ) {
90 if (!fuzzycmp(name, s)) {
91 for (; *s; s+=strlen((void *)s)+1);
92 return s+1-charmaps;
93 }
94 s += strlen((void *)s)+1;
95 if (!*s) {
96 if (s[1] > 0200) s+=2;
97 else s+=2+(128U-s[1])/4*5;
98 }
99 }
100 return -1;
101 }
102
103 iconv_t iconv_open(const char *to, const char *from)
104 {
105 size_t f, t;
106
107 if ((t = find_charmap(to))==-1
108 || (f = find_charmap(from))==-1
109 || (charmaps[t] >= 0320)) {
110 errno = EINVAL;
111 return (iconv_t)-1;
112 }
113
114 return (void *)(f<<16 | t);
115 }
116
117 int iconv_close(iconv_t cd)
118 {
119 return 0;
120 }
121
122 static unsigned get_16(const unsigned char *s, int e)
123 {
124 e &= 1;
125 return s[e]<<8 | s[1-e];
126 }
127
128 static void put_16(unsigned char *s, unsigned c, int e)
129 {
130 e &= 1;
131 s[e] = c>>8;
132 s[1-e] = c;
133 }
134
135 static unsigned get_32(const unsigned char *s, int e)
136 {
137 e &= 3;
138 return s[e]+0U<<24 | s[e^1]<<16 | s[e^2]<<8 | s[e^3];
139 }
140
141 static void put_32(unsigned char *s, unsigned c, int e)
142 {
143 e &= 3;
144 s[e^0] = c>>24;
145 s[e^1] = c>>16;
146 s[e^2] = c>>8;
147 s[e^3] = c;
148 }
149
150 /* Adapt as needed */
151 #define mbrtowc_utf8 mbrtowc
152 #define wctomb_utf8 wctomb
153
154 size_t iconv(iconv_t cd0, char **restrict in, size_t *restrict inb, char **restrict out, size_t *restrict outb)
155 {
156 size_t x=0;
157 unsigned long cd = (unsigned long)cd0;
158 unsigned to = cd & 0xffff;
159 unsigned from = cd >> 16;
160 const unsigned char *map = charmaps+from+1;
161 const unsigned char *tomap = charmaps+to+1;
162 mbstate_t st = {0};
163 wchar_t wc;
164 unsigned c, d;
165 size_t k, l;
166 int err;
167 unsigned char type = map[-1];
168 unsigned char totype = tomap[-1];
169 locale_t *ploc = &CURRENT_LOCALE, loc = *ploc;
170
171 if (!in || !*in || !*inb) return 0;
172
173 *ploc = UTF8_LOCALE;
174
175 for (; *inb; *in+=l, *inb-=l) {
176 c = *(unsigned char *)*in;
177 l = 1;
178
179 if (c >= 128 || type-UTF_32BE < 7U) switch (type) {
180 case UTF_8:
181 l = mbrtowc_utf8(&wc, *in, *inb, &st);
182 if (!l) l++;
183 else if (l == (size_t)-1) goto ilseq;
184 else if (l == (size_t)-2) goto starved;
185 c = wc;
186 break;
187 case US_ASCII:
188 goto ilseq;
189 case WCHAR_T:
190 l = sizeof(wchar_t);
191 if (*inb < l) goto starved;
192 c = *(wchar_t *)*in;
193 if (0) {
194 case UTF_32BE:
195 case UTF_32LE:
196 l = 4;
197 if (*inb < 4) goto starved;
198 c = get_32((void *)*in, type);
199 }
200 if (c-0xd800u < 0x800u || c >= 0x110000u) goto ilseq;
201 break;
202 case UCS2BE:
203 case UCS2LE:
204 case UTF_16BE:
205 case UTF_16LE:
206 l = 2;
207 if (*inb < 2) goto starved;
208 c = get_16((void *)*in, type);
209 if ((unsigned)(c-0xdc00) < 0x400) goto ilseq;
210 if ((unsigned)(c-0xd800) < 0x400) {
211 if (type-UCS2BE < 2U) goto ilseq;
212 l = 4;
213 if (*inb < 4) goto starved;
214 d = get_16((void *)(*in + 2), type);
215 if ((unsigned)(d-0xdc00) >= 0x400) goto ilseq;
216 c = ((c-0xd7c0)<<10) + (d-0xdc00);
217 }
218 break;
219 case SHIFT_JIS:
220 if (c-0xa1 <= 0xdf-0xa1) {
221 c += 0xff61-0xa1;
222 break;
223 }
224 l = 2;
225 if (*inb < 2) goto starved;
226 d = *((unsigned char *)*in + 1);
227 if (c-129 <= 159-129) c -= 129;
228 else if (c-224 <= 239-224) c -= 193;
229 else goto ilseq;
230 c *= 2;
231 if (d-64 <= 158-64) {
232 if (d==127) goto ilseq;
233 if (d>127) d--;
234 d -= 64;
235 } else if (d-159 <= 252-159) {
236 c++;
237 d -= 159;
238 }
239 c = jis0208[c][d];
240 if (!c) goto ilseq;
241 break;
242 case EUC_JP:
243 l = 2;
244 if (*inb < 2) goto starved;
245 d = *((unsigned char *)*in + 1);
246 if (c==0x8e) {
247 c = d;
248 if (c-0xa1 > 0xdf-0xa1) goto ilseq;
249 c += 0xff61 - 0xa1;
250 break;
251 }
252 c -= 0xa1;
253 d -= 0xa1;
254 if (c >= 84 || d >= 94) goto ilseq;
255 c = jis0208[c][d];
256 if (!c) goto ilseq;
257 break;
258 case GB2312:
259 if (c < 0xa1) goto ilseq;
260 case GBK:
261 case GB18030:
262 c -= 0x81;
263 if (c >= 126) goto ilseq;
264 l = 2;
265 if (*inb < 2) goto starved;
266 d = *((unsigned char *)*in + 1);
267 if (d < 0xa1 && type == GB2312) goto ilseq;
268 if (d-0x40>=191 || d==127) {
269 if (d-'0'>9 || type != GB18030)
270 goto ilseq;
271 l = 4;
272 if (*inb < 4) goto starved;
273 c = (10*c + d-'0') * 1260;
274 d = *((unsigned char *)*in + 2);
275 if (d-0x81>126) goto ilseq;
276 c += 10*(d-0x81);
277 d = *((unsigned char *)*in + 3);
278 if (d-'0'>9) goto ilseq;
279 c += d-'0';
280 c += 128;
281 for (d=0; d<=c; ) {
282 k = 0;
283 for (int i=0; i<126; i++)
284 for (int j=0; j<190; j++)
285 if (gb18030[i][j]-d <= c-d)
286 k++;
287 d = c+1;
288 c += k;
289 }
290 break;
291 }
292 d -= 0x40;
293 if (d>63) d--;
294 c = gb18030[c][d];
295 break;
296 case BIG5:
297 l = 2;
298 if (*inb < 2) goto starved;
299 d = *((unsigned char *)*in + 1);
300 if (d-0x40>=0xff-0x40 || d-0x7f<0xa1-0x7f) goto ilseq;
301 d -= 0x40;
302 if (d > 0x3e) d -= 0x22;
303 if (c-0xa1>=0xfa-0xa1) {
304 if (c-0x87>=0xff-0x87) goto ilseq;
305 if (c < 0xa1) c -= 0x87;
306 else c -= 0x87 + (0xfa-0xa1);
307 c = (hkscs[4867+(c*157+d)/16]>>(c*157+d)%16)%2<<17
308 | hkscs[c*157+d];
309 /* A few HKSCS characters map to pairs of UCS
310 * characters. These are mapped to surrogate
311 * range in the hkscs table then hard-coded
312 * here. Ugly, yes. */
313 if (c/256 == 0xdc) {
314 if (totype-0300U > 8) k = 2;
315 else k = "\10\4\4\10\4\4\10\2\4"[totype-0300];
316 if (k > *outb) goto toobig;
317 x += iconv((iconv_t)(uintptr_t)to,
318 &(char *){"\303\212\314\204"
319 "\303\212\314\214"
320 "\303\252\314\204"
321 "\303\252\314\214"
322 +c%256}, &(size_t){4},
323 out, outb);
324 continue;
325 }
326 if (!c) goto ilseq;
327 break;
328 }
329 c -= 0xa1;
330 c = big5[c][d]|(c==0x27&&(d==0x3a||d==0x3c||d==0x42))<<17;
331 if (!c) goto ilseq;
332 break;
333 case EUC_KR:
334 l = 2;
335 if (*inb < 2) goto starved;
336 d = *((unsigned char *)*in + 1);
337 c -= 0xa1;
338 d -= 0xa1;
339 if (c >= 93 || d >= 94) {
340 c += (0xa1-0x81);
341 d += 0xa1;
342 if (c >= 93 || c>=0xc6-0x81 && d>0x52)
343 goto ilseq;
344 if (d-'A'<26) d = d-'A';
345 else if (d-'a'<26) d = d-'a'+26;
346 else if (d-0x81<0xff-0x81) d = d-0x81+52;
347 else goto ilseq;
348 if (c < 0x20) c = 178*c + d;
349 else c = 178*0x20 + 84*(c-0x20) + d;
350 c += 0xac00;
351 for (d=0xac00; d<=c; ) {
352 k = 0;
353 for (int i=0; i<93; i++)
354 for (int j=0; j<94; j++)
355 if (ksc[i][j]-d <= c-d)
356 k++;
357 d = c+1;
358 c += k;
359 }
360 break;
361 }
362 c = ksc[c][d];
363 if (!c) goto ilseq;
364 break;
365 default:
366 if (c < 128+type) break;
367 c -= 128+type;
368 c = legacy_chars[ map[c*5/4]>>2*c%8 |
369 map[c*5/4+1]<<8-2*c%8 & 1023 ];
370 if (!c) c = *(unsigned char *)*in;
371 if (c==1) goto ilseq;
372 }
373
374 switch (totype) {
375 case WCHAR_T:
376 if (*outb < sizeof(wchar_t)) goto toobig;
377 *(wchar_t *)*out = c;
378 *out += sizeof(wchar_t);
379 *outb -= sizeof(wchar_t);
380 break;
381 case UTF_8:
382 if (*outb < 4) {
383 char tmp[4];
384 k = wctomb_utf8(tmp, c);
385 if (*outb < k) goto toobig;
386 memcpy(*out, tmp, k);
387 } else k = wctomb_utf8(*out, c);
388 *out += k;
389 *outb -= k;
390 break;
391 case US_ASCII:
392 if (c > 0x7f) subst: x++, c='*';
393 default:
394 if (*outb < 1) goto toobig;
395 if (c < 128+totype) {
396 revout:
397 *(*out)++ = c;
398 *outb -= 1;
399 break;
400 }
401 d = c;
402 for (c=0; c<128-totype; c++) {
403 if (d == legacy_chars[ tomap[c*5/4]>>2*c%8 |
404 tomap[c*5/4+1]<<8-2*c%8 & 1023 ]) {
405 c += 128;
406 goto revout;
407 }
408 }
409 goto subst;
410 case UCS2BE:
411 case UCS2LE:
412 case UTF_16BE:
413 case UTF_16LE:
414 if (c < 0x10000 || type-UCS2BE < 2U) {
415 if (c >= 0x10000) c = 0xFFFD;
416 if (*outb < 2) goto toobig;
417 put_16((void *)*out, c, totype);
418 *out += 2;
419 *outb -= 2;
420 break;
421 }
422 if (*outb < 4) goto toobig;
423 c -= 0x10000;
424 put_16((void *)*out, (c>>10)|0xd800, totype);
425 put_16((void *)(*out + 2), (c&0x3ff)|0xdc00, totype);
426 *out += 4;
427 *outb -= 4;
428 break;
429 case UTF_32BE:
430 case UTF_32LE:
431 if (*outb < 4) goto toobig;
432 put_32((void *)*out, c, totype);
433 *out += 4;
434 *outb -= 4;
435 break;
436 }
437 }
438 *ploc = loc;
439 return x;
440 ilseq:
441 err = EILSEQ;
442 x = -1;
443 goto end;
444 toobig:
445 err = E2BIG;
446 x = -1;
447 goto end;
448 starved:
449 err = EINVAL;
450 x = -1;
451 end:
452 errno = err;
453 *ploc = loc;
454 return x;
455 }
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