lib/libc/citrus/modules/citrus_euc.c

   1 /*      $NetBSD: citrus_euc.c,v 1.17 2014/01/18 15:21:41 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 1.17 2014/01/18 15:21:41 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_mbsnrtowcs;
 111                 _EUCState       s_wcrtomb;
 112                 _EUCState       s_wcsrtombs;
 113                 _EUCState       s_wcsnrtombs;
 114                 _EUCState       s_wctomb;
 115         } states;
 116 } _EUCCTypeInfo;
 117
 118 #define _SS2    0x008e
 119 #define _SS3    0x008f
 120
 121 #define _CEI_TO_EI(_cei_)               (&(_cei_)->ei)
 122 #define _CEI_TO_STATE(_cei_, _func_)    (_cei_)->states.s_##_func_
 123
 124 #define _FUNCNAME(m)                    _citrus_EUC_##m
 125 #define _ENCODING_INFO                  _EUCEncodingInfo
 126 #define _CTYPE_INFO                     _EUCCTypeInfo
 127 #define _ENCODING_STATE                 _EUCState
 128 #define _ENCODING_MB_CUR_MAX(_ei_)      (_ei_)->mb_cur_max
 129 #define _ENCODING_IS_STATE_DEPENDENT    0
 130 #define _STATE_NEEDS_EXPLICIT_INIT(_ps_)        0
 131
 132
 133 static __inline int
 134 _citrus_EUC_cs(unsigned int c)
 135 {
 136         c &= 0xff;
 137
 138         return ((c & 0x80) ? c == _SS3 ? 3 : c == _SS2 ? 2 : 1 : 0);
 139 }
 140
 141 static __inline int
 142 _citrus_EUC_parse_variable(_EUCEncodingInfo *ei,
 143                            const void *var, size_t lenvar)
 144 {
 145         const char *v, *e;
 146         int x;
 147
 148         /* parse variable string */
 149         if (!var)
 150                 return (EFTYPE);
 151
 152         v = (const char *) var;
 153
 154         while (*v == ' ' || *v == '\t')
 155                 ++v;
 156
 157         ei->mb_cur_max = 1;
 158         for (x = 0; x < 4; ++x) {
 159                 ei->count[x] = (int)_bcs_strtol(v, (char **)&e, 0);
 160                 if (v == e || !(v = e) || ei->count[x]<1 || ei->count[x]>4) {
 161                         return (EFTYPE);
 162                 }
 163                 if (ei->mb_cur_max < ei->count[x])
 164                         ei->mb_cur_max = ei->count[x];
 165                 while (*v == ' ' || *v == '\t')
 166                         ++v;
 167                 ei->bits[x] = (int)_bcs_strtol(v, (char **)&e, 0);
 168                 if (v == e || !(v = e)) {
 169                         return (EFTYPE);
 170                 }
 171                 while (*v == ' ' || *v == '\t')
 172                         ++v;
 173         }
 174         ei->mask = (int)_bcs_strtol(v, (char **)&e, 0);
 175         if (v == e || !(v = e)) {
 176                 return (EFTYPE);
 177         }
 178
 179         return 0;
 180 }
 181
 182
 183 static __inline void
 184 /*ARGSUSED*/
 185 _citrus_EUC_init_state(_EUCEncodingInfo *ei, _EUCState *s)
 186 {
 187         memset(s, 0, sizeof(*s));
 188 }
 189
 190 static __inline void
 191 /*ARGSUSED*/
 192 _citrus_EUC_pack_state(_EUCEncodingInfo *ei, void *pspriv, const _EUCState *s)
 193 {
 194         memcpy(pspriv, (const void *)s, sizeof(*s));
 195 }
 196
 197 static __inline void
 198 /*ARGSUSED*/
 199 _citrus_EUC_unpack_state(_EUCEncodingInfo *ei, _EUCState *s,
 200                          const void *pspriv)
 201 {
 202         memcpy((void *)s, pspriv, sizeof(*s));
 203 }
 204
 205 static int
 206 _citrus_EUC_mbrtowc_priv(_EUCEncodingInfo *ei, wchar_t *pwc, const char **s,
 207                          size_t n, _EUCState *psenc, size_t *nresult)
 208 {
 209         wchar_t wchar;
 210         int c, cs, len;
 211         int chlenbak;
 212         const char *s0, *s1 = NULL;
 213
 214         _DIAGASSERT(nresult != 0);
 215         _DIAGASSERT(ei != NULL);
 216         _DIAGASSERT(psenc != NULL);
 217         _DIAGASSERT(s != NULL);
 218
 219         s0 = *s;
 220
 221         if (s0 == NULL) {
 222                 _citrus_EUC_init_state(ei, psenc);
 223                 *nresult = 0; /* state independent */
 224                 return (0);
 225         }
 226
 227         chlenbak = psenc->chlen;
 228
 229         /* make sure we have the first byte in the buffer */
 230         switch (psenc->chlen) {
 231         case 0:
 232                 if (n < 1)
 233                         goto restart;
 234                 psenc->ch[0] = *s0++;
 235                 psenc->chlen = 1;
 236                 n--;
 237                 break;
 238         case 1:
 239         case 2:
 240                 break;
 241         default:
 242                 /* illgeal state */
 243                 goto encoding_error;
 244         }
 245
 246         c = ei->count[cs = _citrus_EUC_cs(psenc->ch[0] & 0xff)];
 247         if (c == 0)
 248                 goto encoding_error;
 249         while (psenc->chlen < c) {
 250                 if (n < 1)
 251                         goto restart;
 252                 psenc->ch[psenc->chlen] = *s0++;
 253                 psenc->chlen++;
 254                 n--;
 255         }
 256         *s = s0;
 257
 258         switch (cs) {
 259         case 3:
 260         case 2:
 261                 /* skip SS2/SS3 */
 262                 len = c - 1;
 263                 s1 = &psenc->ch[1];
 264                 break;
 265         case 1:
 266         case 0:
 267                 len = c;
 268                 s1 = &psenc->ch[0];
 269                 break;
 270         default:
 271                 goto encoding_error;
 272         }
 273         wchar = 0;
 274         while (len-- > 0)
 275                 wchar = (wchar << 8) | (*s1++ & 0xff);
 276         wchar = (wchar & ~ei->mask) | ei->bits[cs];
 277
 278         psenc->chlen = 0;
 279         if (pwc)
 280                 *pwc = wchar;
 281
 282         if (!wchar) {
 283                 *nresult = 0;
 284         } else {
 285                 *nresult = (size_t)(c - chlenbak);
 286         }
 287
 288         return 0;
 289
 290 encoding_error:
 291         psenc->chlen = 0;
 292         *nresult = (size_t)-1;
 293         return (EILSEQ);
 294
 295 restart:
 296         *nresult = (size_t)-2;
 297         *s = s0;
 298         return (0);
 299 }
 300
 301 static int
 302 _citrus_EUC_wcrtomb_priv(_EUCEncodingInfo *ei, char *s, size_t n, wchar_t wc,
 303                          _EUCState *psenc, size_t *nresult)
 304 {
 305         wchar_t m, nm;
 306         int cs, i, ret;
 307
 308         _DIAGASSERT(ei != NULL);
 309         _DIAGASSERT(nresult != 0);
 310         _DIAGASSERT(s != NULL);
 311
 312         m = wc & ei->mask;
 313         nm = wc & ~m;
 314
 315         for (cs = 0;
 316              cs < sizeof(ei->count)/sizeof(ei->count[0]);
 317              cs++) {
 318                 if (m == ei->bits[cs])
 319                         break;
 320         }
 321         /* fallback case - not sure if it is necessary */
 322         if (cs == sizeof(ei->count)/sizeof(ei->count[0]))
 323                 cs = 1;
 324
 325         i = ei->count[cs];
 326         if (n < i) {
 327                 ret = E2BIG;
 328                 goto err;
 329         }
 330         m = (cs) ? 0x80 : 0x00;
 331         switch (cs) {
 332         case 2:
 333                 *s++ = _SS2;
 334                 i--;
 335                 break;
 336         case 3:
 337                 *s++ = _SS3;
 338                 i--;
 339                 break;
 340         }
 341
 342         while (i-- > 0)
 343                 *s++ = ((nm >> (i << 3)) & 0xff) | m;
 344
 345         *nresult = (size_t)ei->count[cs];
 346         return 0;
 347
 348 err:
 349         *nresult = (size_t)-1;
 350         return ret;
 351 }
 352
 353 static __inline int
 354 /*ARGSUSED*/
 355 _citrus_EUC_stdenc_wctocs(_EUCEncodingInfo * __restrict ei,
 356                           _csid_t * __restrict csid,
 357                           _index_t * __restrict idx, wchar_t wc)
 358 {
 359         wchar_t m, nm;
 360
 361         _DIAGASSERT(ei != NULL && csid != NULL && idx != NULL);
 362
 363         m = wc & ei->mask;
 364         nm = wc & ~m;
 365
 366         *csid = (_citrus_csid_t)m;
 367         *idx  = (_citrus_index_t)nm;
 368
 369         return (0);
 370 }
 371
 372 static __inline int
 373 /*ARGSUSED*/
 374 _citrus_EUC_stdenc_cstowc(_EUCEncodingInfo * __restrict ei,
 375                           wchar_t * __restrict wc,
 376                           _csid_t csid, _index_t idx)
 377 {
 378
 379         _DIAGASSERT(ei != NULL && wc != NULL);
 380
 381         if ((csid & ~ei->mask) != 0 || (idx & ei->mask) != 0)
 382                 return (EINVAL);
 383
 384         *wc = (wchar_t)csid | (wchar_t)idx;
 385
 386         return (0);
 387 }
 388
 389 static __inline int
 390 /*ARGSUSED*/
 391 _citrus_EUC_stdenc_get_state_desc_generic(_EUCEncodingInfo * __restrict ei,
 392                                           _EUCState * __restrict psenc,
 393                                           int * __restrict rstate)
 394 {
 395
 396         if (psenc->chlen == 0)
 397                 *rstate = _STDENC_SDGEN_INITIAL;
 398         else
 399                 *rstate = _STDENC_SDGEN_INCOMPLETE_CHAR;
 400
 401         return 0;
 402 }
 403
 404 static int
 405 /*ARGSUSED*/
 406 _citrus_EUC_encoding_module_init(_EUCEncodingInfo * __restrict ei,
 407                                  const void * __restrict var, size_t lenvar)
 408 {
 409
 410         _DIAGASSERT(ei != NULL);
 411
 412         return (_citrus_EUC_parse_variable(ei, var, lenvar));
 413 }
 414
 415 static void
 416 /*ARGSUSED*/
 417 _citrus_EUC_encoding_module_uninit(_EUCEncodingInfo * __restrict ei)
 418 {
 419 }
 420
 421 /* ----------------------------------------------------------------------
 422  * public interface for ctype
 423  */
 424
 425 _CITRUS_CTYPE_DECLS(EUC);
 426 _CITRUS_CTYPE_DEF_OPS(EUC);
 427
 428 #include "citrus_ctype_template.h"
 429
 430 /* ----------------------------------------------------------------------
 431  * public interface for stdenc
 432  */
 433
 434 _CITRUS_STDENC_DECLS(EUC);
 435 _CITRUS_STDENC_DEF_OPS(EUC);
 436
 437 #include "citrus_stdenc_template.h"