lib/libc/citrus/modules/citrus_euc.c

   1 /*      $NetBSD: citrus_euc.c,v 1.12.6.1 2009/01/04 17:02:19 christos Exp $     */
   2
   3 /*-
   4  * Copyright (c)2002 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 /*-
  30  * Copyright (c) 1993
  31  *      The Regents of the University of California.  All rights reserved.
  32  *
  33  * This code is derived from software contributed to Berkeley by
  34  * Paul Borman at Krystal Technologies.
  35  *
  36  * Redistribution and use in source and binary forms, with or without
  37  * modification, are permitted provided that the following conditions
  38  * are met:
  39  * 1. Redistributions of source code must retain the above copyright
  40  *    notice, this list of conditions and the following disclaimer.
  41  * 2. Redistributions in binary form must reproduce the above copyright
  42  *    notice, this list of conditions and the following disclaimer in the
  43  *    documentation and/or other materials provided with the distribution.
  44  * 3. Neither the name of the University nor the names of its contributors
  45  *    may be used to endorse or promote products derived from this software
  46  *    without specific prior written permission.
  47  *
  48  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  49  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  50  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  51  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  52  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  53  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  54  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  57  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  58  * SUCH DAMAGE.
  59  */
  60
  61 #include <sys/cdefs.h>
  62 #if defined(LIBC_SCCS) && !defined(lint)
  63 __RCSID("$NetBSD: citrus_euc.c,v 1.12.6.1 2009/01/04 17:02:19 christos Exp $");
  64 #endif /* LIBC_SCCS and not lint */
  65
  66 #include <assert.h>
  67 #include <errno.h>
  68 #include <string.h>
  69 #include <stdio.h>
  70 #include <stdlib.h>
  71 #include <stddef.h>
  72 #include <wchar.h>
  73 #include <sys/types.h>
  74 #include <limits.h>
  75
  76 #include "citrus_namespace.h"
  77 #include "citrus_bcs.h"
  78 #include "citrus_types.h"
  79 #include "citrus_module.h"
  80 #include "citrus_ctype.h"
  81 #include "citrus_stdenc.h"
  82 #include "citrus_euc.h"
  83
  84
  85 /* ----------------------------------------------------------------------
  86  * private stuffs used by templates
  87  */
  88
  89 typedef struct {
  90         char ch[3];
  91         int chlen;
  92 } _EUCState;
  93
  94 typedef struct {
  95         unsigned        count[4];
  96         wchar_t         bits[4];
  97         wchar_t         mask;
  98         unsigned        mb_cur_max;
  99 } _EUCEncodingInfo;
 100
 101 typedef struct {
 102         _EUCEncodingInfo        ei;
 103         struct {
 104                 /* for future multi-locale facility */
 105                 _EUCState       s_mblen;
 106                 _EUCState       s_mbrlen;
 107                 _EUCState       s_mbrtowc;
 108                 _EUCState       s_mbtowc;
 109                 _EUCState       s_mbsrtowcs;
 110                 _EUCState       s_wcrtomb;
 111                 _EUCState       s_wcsrtombs;
 112                 _EUCState       s_wctomb;
 113         } states;
 114 } _EUCCTypeInfo;
 115
 116 #define _SS2    0x008e
 117 #define _SS3    0x008f
 118
 119 #define _CEI_TO_EI(_cei_)               (&(_cei_)->ei)
 120 #define _CEI_TO_STATE(_cei_, _func_)    (_cei_)->states.s_##_func_
 121
 122 #define _FUNCNAME(m)                    _citrus_EUC_##m
 123 #define _ENCODING_INFO                  _EUCEncodingInfo
 124 #define _CTYPE_INFO                     _EUCCTypeInfo
 125 #define _ENCODING_STATE                 _EUCState
 126 #define _ENCODING_MB_CUR_MAX(_ei_)      (_ei_)->mb_cur_max
 127 #define _ENCODING_IS_STATE_DEPENDENT    0
 128 #define _STATE_NEEDS_EXPLICIT_INIT(_ps_)        0
 129
 130
 131 static __inline int
 132 _citrus_EUC_cs(unsigned int c)
 133 {
 134         c &= 0xff;
 135
 136         return ((c & 0x80) ? c == _SS3 ? 3 : c == _SS2 ? 2 : 1 : 0);
 137 }
 138
 139 static __inline int
 140 _citrus_EUC_parse_variable(_EUCEncodingInfo *ei,
 141                            const void *var, size_t lenvar)
 142 {
 143         const char *v, *e;
 144         int x;
 145
 146         /* parse variable string */
 147         if (!var)
 148                 return (EFTYPE);
 149
 150         v = (const char *) var;
 151
 152         while (*v == ' ' || *v == '\t')
 153                 ++v;
 154
 155         ei->mb_cur_max = 1;
 156         for (x = 0; x < 4; ++x) {
 157                 ei->count[x] = (int)_bcs_strtol(v, (char **)&e, 0);
 158                 if (v == e || !(v = e) || ei->count[x]<1 || ei->count[x]>4) {
 159                         return (EFTYPE);
 160                 }
 161                 if (ei->mb_cur_max < ei->count[x])
 162                         ei->mb_cur_max = ei->count[x];
 163                 while (*v == ' ' || *v == '\t')
 164                         ++v;
 165                 ei->bits[x] = (int)_bcs_strtol(v, (char **)&e, 0);
 166                 if (v == e || !(v = e)) {
 167                         return (EFTYPE);
 168                 }
 169                 while (*v == ' ' || *v == '\t')
 170                         ++v;
 171         }
 172         ei->mask = (int)_bcs_strtol(v, (char **)&e, 0);
 173         if (v == e || !(v = e)) {
 174                 return (EFTYPE);
 175         }
 176
 177         return 0;
 178 }
 179
 180
 181 static __inline void
 182 /*ARGSUSED*/
 183 _citrus_EUC_init_state(_EUCEncodingInfo *ei, _EUCState *s)
 184 {
 185         memset(s, 0, sizeof(*s));
 186 }
 187
 188 static __inline void
 189 /*ARGSUSED*/
 190 _citrus_EUC_pack_state(_EUCEncodingInfo *ei, void *pspriv, const _EUCState *s)
 191 {
 192         memcpy(pspriv, (const void *)s, sizeof(*s));
 193 }
 194
 195 static __inline void
 196 /*ARGSUSED*/
 197 _citrus_EUC_unpack_state(_EUCEncodingInfo *ei, _EUCState *s,
 198                          const void *pspriv)
 199 {
 200         memcpy((void *)s, pspriv, sizeof(*s));
 201 }
 202
 203 static int
 204 _citrus_EUC_mbrtowc_priv(_EUCEncodingInfo *ei, wchar_t *pwc, const char **s,
 205                          size_t n, _EUCState *psenc, size_t *nresult)
 206 {
 207         wchar_t wchar;
 208         int c, cs, len;
 209         int chlenbak;
 210         const char *s0, *s1 = NULL;
 211
 212         _DIAGASSERT(nresult != 0);
 213         _DIAGASSERT(ei != NULL);
 214         _DIAGASSERT(psenc != NULL);
 215         _DIAGASSERT(s != NULL);
 216
 217         s0 = *s;
 218
 219         if (s0 == NULL) {
 220                 _citrus_EUC_init_state(ei, psenc);
 221                 *nresult = 0; /* state independent */
 222                 return (0);
 223         }
 224
 225         chlenbak = psenc->chlen;
 226
 227         /* make sure we have the first byte in the buffer */
 228         switch (psenc->chlen) {
 229         case 0:
 230                 if (n < 1)
 231                         goto restart;
 232                 psenc->ch[0] = *s0++;
 233                 psenc->chlen = 1;
 234                 n--;
 235                 break;
 236         case 1:
 237         case 2:
 238                 break;
 239         default:
 240                 /* illgeal state */
 241                 goto encoding_error;
 242         }
 243
 244         c = ei->count[cs = _citrus_EUC_cs(psenc->ch[0] & 0xff)];
 245         if (c == 0)
 246                 goto encoding_error;
 247         while (psenc->chlen < c) {
 248                 if (n < 1)
 249                         goto restart;
 250                 psenc->ch[psenc->chlen] = *s0++;
 251                 psenc->chlen++;
 252                 n--;
 253         }
 254         *s = s0;
 255
 256         switch (cs) {
 257         case 3:
 258         case 2:
 259                 /* skip SS2/SS3 */
 260                 len = c - 1;
 261                 s1 = &psenc->ch[1];
 262                 break;
 263         case 1:
 264         case 0:
 265                 len = c;
 266                 s1 = &psenc->ch[0];
 267                 break;
 268         default:
 269                 goto encoding_error;
 270         }
 271         wchar = 0;
 272         while (len-- > 0)
 273                 wchar = (wchar << 8) | (*s1++ & 0xff);
 274         wchar = (wchar & ~ei->mask) | ei->bits[cs];
 275
 276         psenc->chlen = 0;
 277         if (pwc)
 278                 *pwc = wchar;
 279
 280         if (!wchar) {
 281                 *nresult = 0;
 282         } else {
 283                 *nresult = (size_t)(c - chlenbak);
 284         }
 285
 286         return 0;
 287
 288 encoding_error:
 289         psenc->chlen = 0;
 290         *nresult = (size_t)-1;
 291         return (EILSEQ);
 292
 293 restart:
 294         *nresult = (size_t)-2;
 295         *s = s0;
 296         return (0);
 297 }
 298
 299 static int
 300 _citrus_EUC_wcrtomb_priv(_EUCEncodingInfo *ei, char *s, size_t n, wchar_t wc,
 301                          _EUCState *psenc, size_t *nresult)
 302 {
 303         wchar_t m, nm;
 304         int cs, i, ret;
 305
 306         _DIAGASSERT(ei != NULL);
 307         _DIAGASSERT(nresult != 0);
 308         _DIAGASSERT(s != NULL);
 309
 310         m = wc & ei->mask;
 311         nm = wc & ~m;
 312
 313         for (cs = 0;
 314              cs < sizeof(ei->count)/sizeof(ei->count[0]);
 315              cs++) {
 316                 if (m == ei->bits[cs])
 317                         break;
 318         }
 319         /* fallback case - not sure if it is necessary */
 320         if (cs == sizeof(ei->count)/sizeof(ei->count[0]))
 321                 cs = 1;
 322
 323         i = ei->count[cs];
 324         if (n < i) {
 325                 ret = E2BIG;
 326                 goto err;
 327         }
 328         m = (cs) ? 0x80 : 0x00;
 329         switch (cs) {
 330         case 2:
 331                 *s++ = _SS2;
 332                 i--;
 333                 break;
 334         case 3:
 335                 *s++ = _SS3;
 336                 i--;
 337                 break;
 338         }
 339
 340         while (i-- > 0)
 341                 *s++ = ((nm >> (i << 3)) & 0xff) | m;
 342
 343         *nresult = (size_t)ei->count[cs];
 344         return 0;
 345
 346 err:
 347         *nresult = (size_t)-1;
 348         return ret;
 349 }
 350
 351 static __inline int
 352 /*ARGSUSED*/
 353 _citrus_EUC_stdenc_wctocs(_EUCEncodingInfo * __restrict ei,
 354                           _csid_t * __restrict csid,
 355                           _index_t * __restrict idx, wchar_t wc)
 356 {
 357         wchar_t m, nm;
 358
 359         _DIAGASSERT(ei != NULL && csid != NULL && idx != NULL);
 360
 361         m = wc & ei->mask;
 362         nm = wc & ~m;
 363
 364         *csid = (_citrus_csid_t)m;
 365         *idx  = (_citrus_index_t)nm;
 366
 367         return (0);
 368 }
 369
 370 static __inline int
 371 /*ARGSUSED*/
 372 _citrus_EUC_stdenc_cstowc(_EUCEncodingInfo * __restrict ei,
 373                           wchar_t * __restrict wc,
 374                           _csid_t csid, _index_t idx)
 375 {
 376
 377         _DIAGASSERT(ei != NULL && wc != NULL);
 378
 379         if ((csid & ~ei->mask) != 0 || (idx & ei->mask) != 0)
 380                 return (EINVAL);
 381
 382         *wc = (wchar_t)csid | (wchar_t)idx;
 383
 384         return (0);
 385 }
 386
 387 static __inline int
 388 /*ARGSUSED*/
 389 _citrus_EUC_stdenc_get_state_desc_generic(_EUCEncodingInfo * __restrict ei,
 390                                           _EUCState * __restrict psenc,
 391                                           int * __restrict rstate)
 392 {
 393
 394         if (psenc->chlen == 0)
 395                 *rstate = _STDENC_SDGEN_INITIAL;
 396         else
 397                 *rstate = _STDENC_SDGEN_INCOMPLETE_CHAR;
 398
 399         return 0;
 400 }
 401
 402 static int
 403 /*ARGSUSED*/
 404 _citrus_EUC_encoding_module_init(_EUCEncodingInfo * __restrict ei,
 405                                  const void * __restrict var, size_t lenvar)
 406 {
 407
 408         _DIAGASSERT(ei != NULL);
 409
 410         return (_citrus_EUC_parse_variable(ei, var, lenvar));
 411 }
 412
 413 static void
 414 /*ARGSUSED*/
 415 _citrus_EUC_encoding_module_uninit(_EUCEncodingInfo * __restrict ei)
 416 {
 417 }
 418
 419 /* ----------------------------------------------------------------------
 420  * public interface for ctype
 421  */
 422
 423 _CITRUS_CTYPE_DECLS(EUC);
 424 _CITRUS_CTYPE_DEF_OPS(EUC);
 425
 426 #include "citrus_ctype_template.h"
 427
 428 /* ----------------------------------------------------------------------
 429  * public interface for stdenc
 430  */
 431
 432 _CITRUS_STDENC_DECLS(EUC);
 433 _CITRUS_STDENC_DEF_OPS(EUC);
 434
 435 #include "citrus_stdenc_template.h"