lib/libc/citrus/modules/citrus_utf1632.c

   1 /*      $NetBSD: citrus_utf1632.c,v 1.12 2012/02/12 13:51:29 wiz Exp $  */
   2
   3 /*-
   4  * Copyright (c)2003 Citrus Project,
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #include <sys/cdefs.h>
  30 #if defined(LIBC_SCCS) && !defined(lint)
  31 __RCSID("$NetBSD: citrus_utf1632.c,v 1.12 2012/02/12 13:51:29 wiz Exp $");
  32 #endif /* LIBC_SCCS and not lint */
  33
  34 #include <assert.h>
  35 #include <errno.h>
  36 #include <string.h>
  37 #include <stdio.h>
  38 #include <stdlib.h>
  39 #include <stddef.h>
  40 #include <limits.h>
  41 #include <wchar.h>
  42 #include <sys/types.h>
  43 #include <machine/endian.h>
  44
  45 #include "citrus_namespace.h"
  46 #include "citrus_types.h"
  47 #include "citrus_module.h"
  48 #include "citrus_stdenc.h"
  49 #include "citrus_bcs.h"
  50
  51 #include "citrus_utf1632.h"
  52
  53
  54 /* ----------------------------------------------------------------------
  55  * private stuffs used by templates
  56  */
  57
  58 typedef struct {
  59         u_int8_t                ch[4];
  60         int                     chlen;
  61         int                     current_endian;
  62 } _UTF1632State;
  63
  64 typedef struct {
  65         int             preffered_endian;
  66         unsigned int    cur_max;
  67 #define _ENDIAN_UNKNOWN 0
  68 #define _ENDIAN_BIG     1
  69 #define _ENDIAN_LITTLE  2
  70         u_int32_t       mode;
  71 #define _MODE_UTF32             0x00000001U
  72 #define _MODE_FORCE_ENDIAN      0x00000002U
  73 } _UTF1632EncodingInfo;
  74
  75 #define _FUNCNAME(m)                    _citrus_UTF1632_##m
  76 #define _ENCODING_INFO                  _UTF1632EncodingInfo
  77 #define _ENCODING_STATE                 _UTF1632State
  78 #define _ENCODING_MB_CUR_MAX(_ei_)      ((_ei_)->cur_max)
  79 #define _ENCODING_IS_STATE_DEPENDENT    0
  80 #define _STATE_NEEDS_EXPLICIT_INIT(_ps_)        0
  81
  82
  83 static __inline void
  84 /*ARGSUSED*/
  85 _citrus_UTF1632_init_state(_UTF1632EncodingInfo *ei, _UTF1632State *s)
  86 {
  87         memset(s, 0, sizeof(*s));
  88 }
  89
  90 static int
  91 _citrus_UTF1632_mbrtowc_priv(_UTF1632EncodingInfo *ei, wchar_t *pwc,
  92                              const char **s, size_t n, _UTF1632State *psenc,
  93                              size_t *nresult)
  94 {
  95         int chlenbak, endian, needlen;
  96         wchar_t wc;
  97         size_t result;
  98         const char *s0;
  99
 100         _DIAGASSERT(nresult != 0);
 101         _DIAGASSERT(ei != NULL);
 102         _DIAGASSERT(s != NULL);
 103         _DIAGASSERT(psenc != NULL);
 104
 105         s0 = *s;
 106
 107         if (s0 == NULL) {
 108                 _citrus_UTF1632_init_state(ei, psenc);
 109                 *nresult = 0; /* state independent */
 110                 return (0);
 111         }
 112
 113         result = 0;
 114         chlenbak = psenc->chlen;
 115
 116 refetch:
 117         if ((ei->mode & _MODE_UTF32) != 0 || chlenbak>=2)
 118                 needlen = 4;
 119         else
 120                 needlen = 2;
 121
 122         while (chlenbak < needlen) {
 123                 if (n==0)
 124                         goto restart;
 125                 psenc->ch[chlenbak++] = *s0++;
 126                 n--;
 127                 result++;
 128         }
 129
 130         if (psenc->current_endian == _ENDIAN_UNKNOWN) {
 131                 if ((ei->mode & _MODE_FORCE_ENDIAN) == 0) {
 132                         /* judge endian marker */
 133                         if ((ei->mode & _MODE_UTF32) == 0) {
 134                                 /* UTF16 */
 135                                 if (psenc->ch[0]==0xFE && psenc->ch[1]==0xFF) {
 136                                         psenc->current_endian = _ENDIAN_BIG;
 137                                         chlenbak = 0;
 138                                         goto refetch;
 139                                 } else if (psenc->ch[0]==0xFF && psenc->ch[1]==0xFE) {
 140                                         psenc->current_endian = _ENDIAN_LITTLE;
 141                                         chlenbak = 0;
 142                                         goto refetch;
 143                                 }
 144                         } else {
 145                                 /* UTF32 */
 146                                 if (psenc->ch[0]==0x00 && psenc->ch[1]==0x00 &&
 147                                     psenc->ch[2]==0xFE && psenc->ch[3]==0xFF) {
 148                                         psenc->current_endian = _ENDIAN_BIG;
 149                                         chlenbak = 0;
 150                                         goto refetch;
 151                                 } else if (psenc->ch[0]==0xFF && psenc->ch[1]==0xFE &&
 152                                            psenc->ch[2]==0x00 && psenc->ch[3]==0x00) {
 153                                         psenc->current_endian = _ENDIAN_LITTLE;
 154                                         chlenbak = 0;
 155                                         goto refetch;
 156                                 }
 157                         }
 158                 }
 159                 psenc->current_endian = ei->preffered_endian;
 160         }
 161         endian = psenc->current_endian;
 162
 163         /* get wc */
 164         if ((ei->mode & _MODE_UTF32) == 0) {
 165                 /* UTF16 */
 166                 if (needlen==2) {
 167                         switch (endian) {
 168                         case _ENDIAN_LITTLE:
 169                                 wc = (psenc->ch[0] |
 170                                       ((wchar_t)psenc->ch[1] << 8));
 171                                 break;
 172                         case _ENDIAN_BIG:
 173                                 wc = (psenc->ch[1] |
 174                                       ((wchar_t)psenc->ch[0] << 8));
 175                                 break;
 176                         default:
 177                                 goto ilseq;
 178                         }
 179                         if (wc >= 0xD800 && wc <= 0xDBFF) {
 180                                 /* surrogate high */
 181                                 needlen=4;
 182                                 goto refetch;
 183                         }
 184                 } else {
 185                         /* surrogate low */
 186                         wc -= 0xD800; /* wc : surrogate high (see above) */
 187                         wc <<= 10;
 188                         switch (endian) {
 189                         case _ENDIAN_LITTLE:
 190                                 if (psenc->ch[3]<0xDC || psenc->ch[3]>0xDF)
 191                                         goto ilseq;
 192                                 wc |= psenc->ch[2];
 193                                 wc |= (wchar_t)(psenc->ch[3] & 3) << 8;
 194                                 break;
 195                         case _ENDIAN_BIG:
 196                                 if (psenc->ch[2]<0xDC || psenc->ch[2]>0xDF)
 197                                         goto ilseq;
 198                                 wc |= psenc->ch[3];
 199                                 wc |= (wchar_t)(psenc->ch[2] & 3) << 8;
 200                                 break;
 201                         default:
 202                                 goto ilseq;
 203                         }
 204                         wc += 0x10000;
 205                 }
 206         } else {
 207                 /* UTF32 */
 208                 switch (endian) {
 209                 case _ENDIAN_LITTLE:
 210                         wc = (psenc->ch[0] |
 211                               ((wchar_t)psenc->ch[1] << 8) |
 212                               ((wchar_t)psenc->ch[2] << 16) |
 213                               ((wchar_t)psenc->ch[3] << 24));
 214                         break;
 215                 case _ENDIAN_BIG:
 216                         wc = (psenc->ch[3] |
 217                               ((wchar_t)psenc->ch[2] << 8) |
 218                               ((wchar_t)psenc->ch[1] << 16) |
 219                               ((wchar_t)psenc->ch[0] << 24));
 220                         break;
 221                 default:
 222                         goto ilseq;
 223                 }
 224                 if (wc >= 0xD800 && wc <= 0xDFFF)
 225                         goto ilseq;
 226         }
 227
 228
 229         *pwc = wc;
 230         psenc->chlen = 0;
 231         *nresult = result;
 232         *s = s0;
 233
 234         return (0);
 235
 236 ilseq:
 237         *nresult = (size_t)-1;
 238         psenc->chlen = 0;
 239         return (EILSEQ);
 240
 241 restart:
 242         *nresult = (size_t)-2;
 243         psenc->chlen = chlenbak;
 244         *s = s0;
 245         return (0);
 246 }
 247
 248 static int
 249 _citrus_UTF1632_wcrtomb_priv(_UTF1632EncodingInfo *ei, char *s, size_t n,
 250                              wchar_t wc, _UTF1632State *psenc,
 251                              size_t *nresult)
 252 {
 253         wchar_t wc2;
 254         static const char _bom[4] = {
 255 #if BYTE_ORDER == BIG_ENDIAN
 256             0x00, 0x00, 0xFE, 0xFF,
 257 #else
 258             0xFF, 0xFE, 0x00, 0x00,
 259 #endif
 260         };
 261         const char *bom = &_bom[0];
 262         size_t cnt;
 263
 264         _DIAGASSERT(ei != NULL);
 265         _DIAGASSERT(nresult != 0);
 266         _DIAGASSERT(s != NULL);
 267
 268         cnt = (size_t)0;
 269         if (psenc->current_endian == _ENDIAN_UNKNOWN) {
 270                 if ((ei->mode & _MODE_FORCE_ENDIAN) == 0) {
 271                         if (ei->mode & _MODE_UTF32) {
 272                                 cnt = 4;
 273                         } else {
 274                                 cnt = 2;
 275 #if BYTE_ORDER == BIG_ENDIAN
 276                                 bom += 2;
 277 #endif
 278                         }
 279                         if (n < cnt)
 280                                 goto e2big;
 281                         memcpy(s, bom, cnt);
 282                         s += cnt, n -= cnt;
 283                 }
 284                 psenc->current_endian = ei->preffered_endian;
 285         }
 286
 287         wc2 = 0;
 288         if ((ei->mode & _MODE_UTF32)==0) {
 289                 /* UTF16 */
 290                 if (wc>0xFFFF) {
 291                         /* surrogate */
 292                         if (wc>0x10FFFF)
 293                                 goto ilseq;
 294                         if (n < 4)
 295                                 goto e2big;
 296                         cnt += 4;
 297                         wc -= 0x10000;
 298                         wc2 = (wc & 0x3FF) | 0xDC00;
 299                         wc = (wc>>10) | 0xD800;
 300                 } else {
 301                         if (n < 2)
 302                                 goto e2big;
 303                         cnt += 2;
 304                 }
 305
 306 surrogate:
 307                 switch (psenc->current_endian) {
 308                 case _ENDIAN_BIG:
 309                         s[1] = wc;
 310                         s[0] = (wc >>= 8);
 311                         break;
 312                 case _ENDIAN_LITTLE:
 313                         s[0] = wc;
 314                         s[1] = (wc >>= 8);
 315                         break;
 316                 }
 317                 if (wc2!=0) {
 318                         wc = wc2;
 319                         wc2 = 0;
 320                         s += 2;
 321                         goto surrogate;
 322                 }
 323         } else {
 324                 /* UTF32 */
 325                 if (wc >= 0xD800 && wc <= 0xDFFF)
 326                         goto ilseq;
 327                 if (n < 4)
 328                         goto e2big;
 329                 cnt += 4;
 330                 switch (psenc->current_endian) {
 331                 case _ENDIAN_BIG:
 332                         s[3] = wc;
 333                         s[2] = (wc >>= 8);
 334                         s[1] = (wc >>= 8);
 335                         s[0] = (wc >>= 8);
 336                         break;
 337                 case _ENDIAN_LITTLE:
 338                         s[0] = wc;
 339                         s[1] = (wc >>= 8);
 340                         s[2] = (wc >>= 8);
 341                         s[3] = (wc >>= 8);
 342                         break;
 343                 }
 344         }
 345         *nresult = cnt;
 346
 347         return 0;
 348
 349 ilseq:
 350         *nresult = (size_t)-1;
 351         return EILSEQ;
 352 e2big:
 353         *nresult = (size_t)-1;
 354         return E2BIG;
 355 }
 356
 357 static void
 358 parse_variable(_UTF1632EncodingInfo * __restrict ei,
 359                const void * __restrict var, size_t lenvar)
 360 {
 361 #define MATCH(x, act)                                           \
 362 do {                                                            \
 363         if (lenvar >= (sizeof(#x)-1) &&                         \
 364             _bcs_strncasecmp(p, #x, sizeof(#x)-1) == 0) {       \
 365                 act;                                            \
 366                 lenvar -= sizeof(#x)-1;                         \
 367                 p += sizeof(#x)-1;                              \
 368         }                                                       \
 369 } while (/*CONSTCOND*/0)
 370         const char *p;
 371         p = var;
 372         while (lenvar>0) {
 373                 switch (*p) {
 374                 case 'B':
 375                 case 'b':
 376                         MATCH(big, ei->preffered_endian = _ENDIAN_BIG);
 377                         break;
 378                 case 'L':
 379                 case 'l':
 380                         MATCH(little, ei->preffered_endian = _ENDIAN_LITTLE);
 381                         break;
 382                 case 'F':
 383                 case 'f':
 384                         MATCH(force, ei->mode |= _MODE_FORCE_ENDIAN);
 385                         break;
 386                 case 'U':
 387                 case 'u':
 388                         MATCH(utf32, ei->mode |= _MODE_UTF32);
 389                         break;
 390                 }
 391                 p++;
 392                 lenvar--;
 393         }
 394 }
 395
 396 static int
 397 /*ARGSUSED*/
 398 _citrus_UTF1632_encoding_module_init(_UTF1632EncodingInfo * __restrict ei,
 399                                      const void * __restrict var,
 400                                      size_t lenvar)
 401 {
 402         _DIAGASSERT(ei != NULL);
 403
 404         memset((void *)ei, 0, sizeof(*ei));
 405
 406         parse_variable(ei, var, lenvar);
 407
 408         if ((ei->mode&_MODE_UTF32)==0)
 409                 ei->cur_max = 6; /* endian + surrogate */
 410         else
 411                 ei->cur_max = 8; /* endian + normal */
 412
 413         if (ei->preffered_endian == _ENDIAN_UNKNOWN) {
 414 #if BYTE_ORDER == BIG_ENDIAN
 415                 ei->preffered_endian = _ENDIAN_BIG;
 416 #else
 417                 ei->preffered_endian = _ENDIAN_LITTLE;
 418 #endif
 419         }
 420
 421         return (0);
 422 }
 423
 424 static void
 425 /*ARGSUSED*/
 426 _citrus_UTF1632_encoding_module_uninit(_UTF1632EncodingInfo *ei)
 427 {
 428 }
 429
 430 static __inline int
 431 /*ARGSUSED*/
 432 _citrus_UTF1632_stdenc_wctocs(_UTF1632EncodingInfo * __restrict ei,
 433                               _csid_t * __restrict csid,
 434                               _index_t * __restrict idx,
 435                               _wc_t wc)
 436 {
 437
 438         _DIAGASSERT(csid != NULL && idx != NULL);
 439
 440         *csid = 0;
 441         *idx = (_index_t)wc;
 442
 443         return (0);
 444 }
 445
 446 static __inline int
 447 /*ARGSUSED*/
 448 _citrus_UTF1632_stdenc_cstowc(_UTF1632EncodingInfo * __restrict ei,
 449                               _wc_t * __restrict wc,
 450                               _csid_t csid, _index_t idx)
 451 {
 452
 453         _DIAGASSERT(wc != NULL);
 454
 455         if (csid != 0)
 456                 return (EILSEQ);
 457
 458         *wc = (_wc_t)idx;
 459
 460         return (0);
 461 }
 462
 463 static __inline int
 464 /*ARGSUSED*/
 465 _citrus_UTF1632_stdenc_get_state_desc_generic(_UTF1632EncodingInfo * __restrict ei,
 466                                               _UTF1632State * __restrict psenc,
 467                                               int * __restrict rstate)
 468 {
 469
 470         if (psenc->chlen == 0)
 471                 *rstate = _STDENC_SDGEN_INITIAL;
 472         else
 473                 *rstate = _STDENC_SDGEN_INCOMPLETE_CHAR;
 474
 475         return 0;
 476 }
 477
 478 /* ----------------------------------------------------------------------
 479  * public interface for stdenc
 480  */
 481
 482 _CITRUS_STDENC_DECLS(UTF1632);
 483 _CITRUS_STDENC_DEF_OPS(UTF1632);
 484
 485 #include "citrus_stdenc_template.h"