release/src/router/libiconv/lib/iconv.c

   1 /*
   2  * Copyright (C) 1999-2008, 2011 Free Software Foundation, Inc.
   3  * This file is part of the GNU LIBICONV Library.
   4  *
   5  * The GNU LIBICONV Library is free software; you can redistribute it
   6  * and/or modify it under the terms of the GNU Library General Public
   7  * License as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  *
  10  * The GNU LIBICONV Library is distributed in the hope that it will be
  11  * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Library General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Library General Public
  16  * License along with the GNU LIBICONV Library; see the file COPYING.LIB.
  17  * If not, write to the Free Software Foundation, Inc., 51 Franklin Street,
  18  * Fifth Floor, Boston, MA 02110-1301, USA.
  19  */
  20
  21 #include <iconv.h>
  22
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include "config.h"
  26 #include "localcharset.h"
  27
  28 #ifdef __CYGWIN__
  29 #include <cygwin/version.h>
  30 #endif
  31
  32 #if ENABLE_EXTRA
  33 /*
  34  * Consider all system dependent encodings, for any system,
  35  * and the extra encodings.
  36  */
  37 #define USE_AIX
  38 #define USE_OSF1
  39 #define USE_DOS
  40 #define USE_EXTRA
  41 #else
  42 /*
  43  * Consider those system dependent encodings that are needed for the
  44  * current system.
  45  */
  46 #ifdef _AIX
  47 #define USE_AIX
  48 #endif
  49 #if defined(__osf__) || defined(VMS)
  50 #define USE_OSF1
  51 #endif
  52 #if defined(__DJGPP__) || (defined(_WIN32) && (defined(_MSC_VER) || defined(__MINGW32__)))
  53 #define USE_DOS
  54 #endif
  55 #endif
  56
  57 /*
  58  * Data type for general conversion loop.
  59  */
  60 struct loop_funcs {
  61   size_t (*loop_convert) (iconv_t icd,
  62                           const char* * inbuf, size_t *inbytesleft,
  63                           char* * outbuf, size_t *outbytesleft);
  64   size_t (*loop_reset) (iconv_t icd,
  65                         char* * outbuf, size_t *outbytesleft);
  66 };
  67
  68 /*
  69  * Converters.
  70  */
  71 #include "converters.h"
  72
  73 /*
  74  * Transliteration tables.
  75  */
  76 #include "cjk_variants.h"
  77 #include "translit.h"
  78
  79 /*
  80  * Table of all supported encodings.
  81  */
  82 struct encoding {
  83   struct mbtowc_funcs ifuncs; /* conversion multibyte -> unicode */
  84   struct wctomb_funcs ofuncs; /* conversion unicode -> multibyte */
  85   int oflags;                 /* flags for unicode -> multibyte conversion */
  86 };
  87 #define DEFALIAS(xxx_alias,xxx) /* nothing */
  88 enum {
  89 #define DEFENCODING(xxx_names,xxx,xxx_ifuncs1,xxx_ifuncs2,xxx_ofuncs1,xxx_ofuncs2) \
  90   ei_##xxx ,
  91 #include "encodings.def"
  92 #ifdef USE_AIX
  93 # include "encodings_aix.def"
  94 #endif
  95 #ifdef USE_OSF1
  96 # include "encodings_osf1.def"
  97 #endif
  98 #ifdef USE_DOS
  99 # include "encodings_dos.def"
 100 #endif
 101 #ifdef USE_EXTRA
 102 # include "encodings_extra.def"
 103 #endif
 104 #include "encodings_local.def"
 105 #undef DEFENCODING
 106 ei_for_broken_compilers_that_dont_like_trailing_commas
 107 };
 108 #include "flags.h"
 109 static struct encoding const all_encodings[] = {
 110 #define DEFENCODING(xxx_names,xxx,xxx_ifuncs1,xxx_ifuncs2,xxx_ofuncs1,xxx_ofuncs2) \
 111   { xxx_ifuncs1,xxx_ifuncs2, xxx_ofuncs1,xxx_ofuncs2, ei_##xxx##_oflags },
 112 #include "encodings.def"
 113 #ifdef USE_AIX
 114 # include "encodings_aix.def"
 115 #endif
 116 #ifdef USE_OSF1
 117 # include "encodings_osf1.def"
 118 #endif
 119 #ifdef USE_DOS
 120 # include "encodings_dos.def"
 121 #endif
 122 #ifdef USE_EXTRA
 123 # include "encodings_extra.def"
 124 #endif
 125 #undef DEFENCODING
 126 #define DEFENCODING(xxx_names,xxx,xxx_ifuncs1,xxx_ifuncs2,xxx_ofuncs1,xxx_ofuncs2) \
 127   { xxx_ifuncs1,xxx_ifuncs2, xxx_ofuncs1,xxx_ofuncs2, 0 },
 128 #include "encodings_local.def"
 129 #undef DEFENCODING
 130 };
 131 #undef DEFALIAS
 132
 133 /*
 134  * Conversion loops.
 135  */
 136 #include "loops.h"
 137
 138 /*
 139  * Alias lookup function.
 140  * Defines
 141  *   struct alias { int name; unsigned int encoding_index; };
 142  *   const struct alias * aliases_lookup (const char *str, unsigned int len);
 143  *   #define MAX_WORD_LENGTH ...
 144  */
 145 #if defined _AIX
 146 # include "aliases_sysaix.h"
 147 #elif defined hpux || defined __hpux
 148 # include "aliases_syshpux.h"
 149 #elif defined __osf__
 150 # include "aliases_sysosf1.h"
 151 #elif defined __sun
 152 # include "aliases_syssolaris.h"
 153 #else
 154 # include "aliases.h"
 155 #endif
 156
 157 /*
 158  * System dependent alias lookup function.
 159  * Defines
 160  *   const struct alias * aliases2_lookup (const char *str);
 161  */
 162 #if defined(USE_AIX) || defined(USE_OSF1) || defined(USE_DOS) || defined(USE_EXTRA) /* || ... */
 163 struct stringpool2_t {
 164 #define S(tag,name,encoding_index) char stringpool_##tag[sizeof(name)];
 165 #include "aliases2.h"
 166 #undef S
 167 };
 168 static const struct stringpool2_t stringpool2_contents = {
 169 #define S(tag,name,encoding_index) name,
 170 #include "aliases2.h"
 171 #undef S
 172 };
 173 #define stringpool2 ((const char *) &stringpool2_contents)
 174 static const struct alias sysdep_aliases[] = {
 175 #define S(tag,name,encoding_index) { (int)(long)&((struct stringpool2_t *)0)->stringpool_##tag, encoding_index },
 176 #include "aliases2.h"
 177 #undef S
 178 };
 179 #ifdef __GNUC__
 180 __inline
 181 #endif
 182 const struct alias *
 183 aliases2_lookup (register const char *str)
 184 {
 185   const struct alias * ptr;
 186   unsigned int count;
 187   for (ptr = sysdep_aliases, count = sizeof(sysdep_aliases)/sizeof(sysdep_aliases[0]); count > 0; ptr++, count--)
 188     if (!strcmp(str, stringpool2 + ptr->name))
 189       return ptr;
 190   return NULL;
 191 }
 192 #else
 193 #define aliases2_lookup(str)  NULL
 194 #define stringpool2  NULL
 195 #endif
 196
 197 #if 0
 198 /* Like !strcasecmp, except that the both strings can be assumed to be ASCII
 199    and the first string can be assumed to be in uppercase. */
 200 static int strequal (const char* str1, const char* str2)
 201 {
 202   unsigned char c1;
 203   unsigned char c2;
 204   for (;;) {
 205     c1 = * (unsigned char *) str1++;
 206     c2 = * (unsigned char *) str2++;
 207     if (c1 == 0)
 208       break;
 209     if (c2 >= 'a' && c2 <= 'z')
 210       c2 -= 'a'-'A';
 211     if (c1 != c2)
 212       break;
 213   }
 214   return (c1 == c2);
 215 }
 216 #endif
 217
 218 iconv_t iconv_open (const char* tocode, const char* fromcode)
 219 {
 220   struct conv_struct * cd;
 221   unsigned int from_index;
 222   int from_wchar;
 223   unsigned int to_index;
 224   int to_wchar;
 225   int transliterate;
 226   int discard_ilseq;
 227
 228 #include "iconv_open1.h"
 229
 230   cd = (struct conv_struct *) malloc(from_wchar != to_wchar
 231                                      ? sizeof(struct wchar_conv_struct)
 232                                      : sizeof(struct conv_struct));
 233   if (cd == NULL) {
 234     errno = ENOMEM;
 235     return (iconv_t)(-1);
 236   }
 237
 238 #include "iconv_open2.h"
 239
 240   return (iconv_t)cd;
 241 invalid:
 242   errno = EINVAL;
 243   return (iconv_t)(-1);
 244 }
 245
 246 size_t iconv (iconv_t icd,
 247               ICONV_CONST char* * inbuf, size_t *inbytesleft,
 248               char* * outbuf, size_t *outbytesleft)
 249 {
 250   conv_t cd = (conv_t) icd;
 251   if (inbuf == NULL || *inbuf == NULL)
 252     return cd->lfuncs.loop_reset(icd,outbuf,outbytesleft);
 253   else
 254     return cd->lfuncs.loop_convert(icd,
 255                                    (const char* *)inbuf,inbytesleft,
 256                                    outbuf,outbytesleft);
 257 }
 258
 259 int iconv_close (iconv_t icd)
 260 {
 261   conv_t cd = (conv_t) icd;
 262   free(cd);
 263   return 0;
 264 }
 265
 266 #ifndef LIBICONV_PLUG
 267
 268 /*
 269  * Verify that a 'struct conv_struct' and a 'struct wchar_conv_struct' each
 270  * fit in an iconv_allocation_t.
 271  * If this verification fails, iconv_allocation_t must be made larger and
 272  * the major version in LIBICONV_VERSION_INFO must be bumped.
 273  * Currently 'struct conv_struct' has 21 integer/pointer fields, and
 274  * 'struct wchar_conv_struct' additionally has an 'mbstate_t' field.
 275  */
 276 typedef int verify_size_1[2 * (sizeof (struct conv_struct) <= sizeof (iconv_allocation_t)) - 1];
 277 typedef int verify_size_2[2 * (sizeof (struct wchar_conv_struct) <= sizeof (iconv_allocation_t)) - 1];
 278
 279 int iconv_open_into (const char* tocode, const char* fromcode,
 280                      iconv_allocation_t* resultp)
 281 {
 282   struct conv_struct * cd;
 283   unsigned int from_index;
 284   int from_wchar;
 285   unsigned int to_index;
 286   int to_wchar;
 287   int transliterate;
 288   int discard_ilseq;
 289
 290 #include "iconv_open1.h"
 291
 292   cd = (struct conv_struct *) resultp;
 293
 294 #include "iconv_open2.h"
 295
 296   return 0;
 297 invalid:
 298   errno = EINVAL;
 299   return -1;
 300 }
 301
 302 int iconvctl (iconv_t icd, int request, void* argument)
 303 {
 304   conv_t cd = (conv_t) icd;
 305   switch (request) {
 306     case ICONV_TRIVIALP:
 307       *(int *)argument =
 308         ((cd->lfuncs.loop_convert == unicode_loop_convert
 309           && cd->iindex == cd->oindex)
 310          || cd->lfuncs.loop_convert == wchar_id_loop_convert
 311          ? 1 : 0);
 312       return 0;
 313     case ICONV_GET_TRANSLITERATE:
 314       *(int *)argument = cd->transliterate;
 315       return 0;
 316     case ICONV_SET_TRANSLITERATE:
 317       cd->transliterate = (*(const int *)argument ? 1 : 0);
 318       return 0;
 319     case ICONV_GET_DISCARD_ILSEQ:
 320       *(int *)argument = cd->discard_ilseq;
 321       return 0;
 322     case ICONV_SET_DISCARD_ILSEQ:
 323       cd->discard_ilseq = (*(const int *)argument ? 1 : 0);
 324       return 0;
 325     case ICONV_SET_HOOKS:
 326       if (argument != NULL) {
 327         cd->hooks = *(const struct iconv_hooks *)argument;
 328       } else {
 329         cd->hooks.uc_hook = NULL;
 330         cd->hooks.wc_hook = NULL;
 331         cd->hooks.data = NULL;
 332       }
 333       return 0;
 334     case ICONV_SET_FALLBACKS:
 335       if (argument != NULL) {
 336         cd->fallbacks = *(const struct iconv_fallbacks *)argument;
 337       } else {
 338         cd->fallbacks.mb_to_uc_fallback = NULL;
 339         cd->fallbacks.uc_to_mb_fallback = NULL;
 340         cd->fallbacks.mb_to_wc_fallback = NULL;
 341         cd->fallbacks.wc_to_mb_fallback = NULL;
 342         cd->fallbacks.data = NULL;
 343       }
 344       return 0;
 345     default:
 346       errno = EINVAL;
 347       return -1;
 348   }
 349 }
 350
 351 /* An alias after its name has been converted from 'int' to 'const char*'. */
 352 struct nalias { const char* name; unsigned int encoding_index; };
 353
 354 static int compare_by_index (const void * arg1, const void * arg2)
 355 {
 356   const struct nalias * alias1 = (const struct nalias *) arg1;
 357   const struct nalias * alias2 = (const struct nalias *) arg2;
 358   return (int)alias1->encoding_index - (int)alias2->encoding_index;
 359 }
 360
 361 static int compare_by_name (const void * arg1, const void * arg2)
 362 {
 363   const char * name1 = *(const char **)arg1;
 364   const char * name2 = *(const char **)arg2;
 365   /* Compare alphabetically, but put "CS" names at the end. */
 366   int sign = strcmp(name1,name2);
 367   if (sign != 0) {
 368     sign = ((name1[0]=='C' && name1[1]=='S') - (name2[0]=='C' && name2[1]=='S'))
 369            * 4 + (sign >= 0 ? 1 : -1);
 370   }
 371   return sign;
 372 }
 373
 374 void iconvlist (int (*do_one) (unsigned int namescount,
 375                                const char * const * names,
 376                                void* data),
 377                 void* data)
 378 {
 379 #define aliascount1  sizeof(aliases)/sizeof(aliases[0])
 380 #ifndef aliases2_lookup
 381 #define aliascount2  sizeof(sysdep_aliases)/sizeof(sysdep_aliases[0])
 382 #else
 383 #define aliascount2  0
 384 #endif
 385 #define aliascount  (aliascount1+aliascount2)
 386   struct nalias aliasbuf[aliascount];
 387   const char * namesbuf[aliascount];
 388   size_t num_aliases;
 389   {
 390     /* Put all existing aliases into a buffer. */
 391     size_t i;
 392     size_t j;
 393     j = 0;
 394     for (i = 0; i < aliascount1; i++) {
 395       const struct alias * p = &aliases[i];
 396       if (p->name >= 0
 397           && p->encoding_index != ei_local_char
 398           && p->encoding_index != ei_local_wchar_t) {
 399         aliasbuf[j].name = stringpool + p->name;
 400         aliasbuf[j].encoding_index = p->encoding_index;
 401         j++;
 402       }
 403     }
 404 #ifndef aliases2_lookup
 405     for (i = 0; i < aliascount2; i++) {
 406       aliasbuf[j].name = stringpool2 + sysdep_aliases[i].name;
 407       aliasbuf[j].encoding_index = sysdep_aliases[i].encoding_index;
 408       j++;
 409     }
 410 #endif
 411     num_aliases = j;
 412   }
 413   /* Sort by encoding_index. */
 414   if (num_aliases > 1)
 415     qsort(aliasbuf, num_aliases, sizeof(struct nalias), compare_by_index);
 416   {
 417     /* Process all aliases with the same encoding_index together. */
 418     size_t j;
 419     j = 0;
 420     while (j < num_aliases) {
 421       unsigned int ei = aliasbuf[j].encoding_index;
 422       size_t i = 0;
 423       do
 424         namesbuf[i++] = aliasbuf[j++].name;
 425       while (j < num_aliases && aliasbuf[j].encoding_index == ei);
 426       if (i > 1)
 427         qsort(namesbuf, i, sizeof(const char *), compare_by_name);
 428       /* Call the callback. */
 429       if (do_one(i,namesbuf,data))
 430         break;
 431     }
 432   }
 433 #undef aliascount
 434 #undef aliascount2
 435 #undef aliascount1
 436 }
 437
 438 /*
 439  * Table of canonical names of encodings.
 440  * Instead of strings, it contains offsets into stringpool and stringpool2.
 441  */
 442 static const unsigned short all_canonical[] = {
 443 #if defined _AIX
 444 # include "canonical_sysaix.h"
 445 #elif defined hpux || defined __hpux
 446 # include "canonical_syshpux.h"
 447 #elif defined __osf__
 448 # include "canonical_sysosf1.h"
 449 #elif defined __sun
 450 # include "canonical_syssolaris.h"
 451 #else
 452 # include "canonical.h"
 453 #endif
 454 #ifdef USE_AIX
 455 # if defined _AIX
 456 #  include "canonical_aix_sysaix.h"
 457 # else
 458 #  include "canonical_aix.h"
 459 # endif
 460 #endif
 461 #ifdef USE_OSF1
 462 # if defined __osf__
 463 #  include "canonical_osf1_sysosf1.h"
 464 # else
 465 #  include "canonical_osf1.h"
 466 # endif
 467 #endif
 468 #ifdef USE_DOS
 469 # include "canonical_dos.h"
 470 #endif
 471 #ifdef USE_EXTRA
 472 # include "canonical_extra.h"
 473 #endif
 474 #if defined _AIX
 475 # include "canonical_local_sysaix.h"
 476 #elif defined hpux || defined __hpux
 477 # include "canonical_local_syshpux.h"
 478 #elif defined __osf__
 479 # include "canonical_local_sysosf1.h"
 480 #elif defined __sun
 481 # include "canonical_local_syssolaris.h"
 482 #else
 483 # include "canonical_local.h"
 484 #endif
 485 };
 486
 487 const char * iconv_canonicalize (const char * name)
 488 {
 489   const char* code;
 490   char buf[MAX_WORD_LENGTH+10+1];
 491   const char* cp;
 492   char* bp;
 493   const struct alias * ap;
 494   unsigned int count;
 495   unsigned int index;
 496   const char* pool;
 497
 498   /* Before calling aliases_lookup, convert the input string to upper case,
 499    * and check whether it's entirely ASCII (we call gperf with option "-7"
 500    * to achieve a smaller table) and non-empty. If it's not entirely ASCII,
 501    * or if it's too long, it is not a valid encoding name.
 502    */
 503   for (code = name;;) {
 504     /* Search code in the table. */
 505     for (cp = code, bp = buf, count = MAX_WORD_LENGTH+10+1; ; cp++, bp++) {
 506       unsigned char c = * (unsigned char *) cp;
 507       if (c >= 0x80)
 508         goto invalid;
 509       if (c >= 'a' && c <= 'z')
 510         c -= 'a'-'A';
 511       *bp = c;
 512       if (c == '\0')
 513         break;
 514       if (--count == 0)
 515         goto invalid;
 516     }
 517     for (;;) {
 518       if (bp-buf >= 10 && memcmp(bp-10,"//TRANSLIT",10)==0) {
 519         bp -= 10;
 520         *bp = '\0';
 521         continue;
 522       }
 523       if (bp-buf >= 8 && memcmp(bp-8,"//IGNORE",8)==0) {
 524         bp -= 8;
 525         *bp = '\0';
 526         continue;
 527       }
 528       break;
 529     }
 530     if (buf[0] == '\0') {
 531       code = locale_charset();
 532       /* Avoid an endless loop that could occur when using an older version
 533          of localcharset.c. */
 534       if (code[0] == '\0')
 535         goto invalid;
 536       continue;
 537     }
 538     pool = stringpool;
 539     ap = aliases_lookup(buf,bp-buf);
 540     if (ap == NULL) {
 541       pool = stringpool2;
 542       ap = aliases2_lookup(buf);
 543       if (ap == NULL)
 544         goto invalid;
 545     }
 546     if (ap->encoding_index == ei_local_char) {
 547       code = locale_charset();
 548       /* Avoid an endless loop that could occur when using an older version
 549          of localcharset.c. */
 550       if (code[0] == '\0')
 551         goto invalid;
 552       continue;
 553     }
 554     if (ap->encoding_index == ei_local_wchar_t) {
 555       /* On systems which define __STDC_ISO_10646__, wchar_t is Unicode.
 556          This is also the case on native Woe32 systems and Cygwin >= 1.7, where
 557          we know that it is UTF-16.  */
 558 #if ((defined _WIN32 || defined __WIN32__) && !defined __CYGWIN__) || (defined __CYGWIN__ && CYGWIN_VERSION_DLL_MAJOR >= 1007)
 559       if (sizeof(wchar_t) == 4) {
 560         index = ei_ucs4internal;
 561         break;
 562       }
 563       if (sizeof(wchar_t) == 2) {
 564 # if WORDS_LITTLEENDIAN
 565         index = ei_utf16le;
 566 # else
 567         index = ei_utf16be;
 568 # endif
 569         break;
 570       }
 571 #elif __STDC_ISO_10646__
 572       if (sizeof(wchar_t) == 4) {
 573         index = ei_ucs4internal;
 574         break;
 575       }
 576       if (sizeof(wchar_t) == 2) {
 577         index = ei_ucs2internal;
 578         break;
 579       }
 580       if (sizeof(wchar_t) == 1) {
 581         index = ei_iso8859_1;
 582         break;
 583       }
 584 #endif
 585     }
 586     index = ap->encoding_index;
 587     break;
 588   }
 589   return all_canonical[index] + pool;
 590  invalid:
 591   return name;
 592 }
 593
 594 int _libiconv_version = _LIBICONV_VERSION;
 595
 596 #if defined __FreeBSD__ && !defined __gnu_freebsd__
 597 /* GNU libiconv is the native FreeBSD iconv implementation since 2002.
 598    It wants to define the symbols 'iconv_open', 'iconv', 'iconv_close'.  */
 599 #define strong_alias(name, aliasname) _strong_alias(name, aliasname)
 600 #define _strong_alias(name, aliasname) \
 601   extern __typeof (name) aliasname __attribute__ ((alias (#name)));
 602 #undef iconv_open
 603 #undef iconv
 604 #undef iconv_close
 605 strong_alias (libiconv_open, iconv_open)
 606 strong_alias (libiconv, iconv)
 607 strong_alias (libiconv_close, iconv_close)
 608 #endif
 609
 610 #endif