iconv/gconv_simple.c

   1 /* Simple transformations functions.
   2    Copyright (C) 1997, 1998, 1999 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Library General Public License as
   8    published by the Free Software Foundation; either version 2 of the
   9    License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Library General Public License for more details.
  15
  16    You should have received a copy of the GNU Library General Public
  17    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  18    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #include <byteswap.h>
  22 #include <endian.h>
  23 #include <errno.h>
  24 #include <gconv.h>
  25 #include <stdint.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <wchar.h>
  29 #include <sys/param.h>
  30
  31 #ifndef EILSEQ
  32 # define EILSEQ EINVAL
  33 #endif
  34
  35
  36 /* These are definitions used by some of the functions for handling
  37    UTF-8 encoding below.  */
  38 static const uint32_t encoding_mask[] =
  39 {
  40   ~0x7ff, ~0xffff, ~0x1fffff, ~0x3ffffff
  41 };
  42
  43 static const unsigned char encoding_byte[] =
  44 {
  45   0xc0, 0xe0, 0xf0, 0xf8, 0xfc
  46 };
  47
  48
  49 /* Transform from the internal, UCS4-like format, to UCS4.  The
  50    difference between the internal ucs4 format and the real UCS4
  51    format is, if any, the endianess.  The Unicode/ISO 10646 says that
  52    unless some higher protocol specifies it differently, the byte
  53    order is big endian.*/
  54 #define DEFINE_INIT             0
  55 #define DEFINE_FINI             0
  56 #define MIN_NEEDED_FROM         4
  57 #define MIN_NEEDED_TO           4
  58 #define FROM_DIRECTION          1
  59 #define FROM_LOOP               internal_ucs4_loop
  60 #define TO_LOOP                 internal_ucs4_loop /* This is not used.  */
  61 #define FUNCTION_NAME           __gconv_transform_internal_ucs4
  62
  63
  64 static inline int
  65 internal_ucs4_loop (const unsigned char **inptrp, const unsigned char *inend,
  66                     unsigned char **outptrp, unsigned char *outend,
  67                     mbstate_t *state, void *data, size_t *converted)
  68 {
  69   const unsigned char *inptr = *inptrp;
  70   unsigned char *outptr = *outptrp;
  71   size_t n_convert = MIN (inend - inptr, outend - outptr) / 4;
  72   int result;
  73
  74 #if __BYTE_ORDER == __LITTLE_ENDIAN
  75   /* Sigh, we have to do some real work.  */
  76   size_t cnt;
  77
  78   for (cnt = 0; cnt < n_convert; ++cnt, inptr += 4)
  79     *((uint32_t *) outptr)++ = bswap_32 (*(uint32_t *) inptr);
  80
  81   *inptrp = inptr;
  82   *outptrp = outptr;
  83 #elif __BYTE_ORDER == __BIG_ENDIAN
  84   /* Simply copy the data.  */
  85   *inptrp = inptr + n_convert * 4;
  86   *outptrp = __mempcpy (outptr, inptr, n_convert * 4);
  87 #else
  88 # error "This endianess is not supported."
  89 #endif
  90
  91   /* Determine the status.  */
  92   if (*outptrp == outend)
  93     result = GCONV_FULL_OUTPUT;
  94   else if (*inptrp == inend)
  95     result = GCONV_EMPTY_INPUT;
  96   else
  97     result = GCONV_INCOMPLETE_INPUT;
  98
  99   if (converted != NULL)
 100     converted += n_convert;
 101
 102   return result;
 103 }
 104
 105 #include <iconv/skeleton.c>
 106
 107
 108 /* Convert from ISO 646-IRV to the internal (UCS4-like) format.  */
 109 #define DEFINE_INIT             0
 110 #define DEFINE_FINI             0
 111 #define MIN_NEEDED_FROM         1
 112 #define MIN_NEEDED_TO           4
 113 #define FROM_DIRECTION          1
 114 #define FROM_LOOP               ascii_internal_loop
 115 #define TO_LOOP                 ascii_internal_loop /* This is not used.  */
 116 #define FUNCTION_NAME           __gconv_transform_ascii_internal
 117
 118 #define MIN_NEEDED_INPUT        MIN_NEEDED_FROM
 119 #define MIN_NEEDED_OUTPUT       MIN_NEEDED_TO
 120 #define LOOPFCT                 FROM_LOOP
 121 #define BODY \
 122   {                                                                           \
 123     if (*inptr > '\x7f')                                                      \
 124       {                                                                       \
 125         /* This is no correct ANSI_X3.4-1968 character.  */                   \
 126         result = GCONV_ILLEGAL_INPUT;                                         \
 127         break;                                                                \
 128       }                                                                       \
 129                                                                               \
 130     /* It's an one byte sequence.  */                                         \
 131     *((uint32_t *) outptr)++ = *inptr++;                                      \
 132   }
 133 #include <iconv/loop.c>
 134 #include <iconv/skeleton.c>
 135
 136
 137 /* Convert from the internal (UCS4-like) format to ISO 646-IRV.  */
 138 #define DEFINE_INIT             0
 139 #define DEFINE_FINI             0
 140 #define MIN_NEEDED_FROM         4
 141 #define MIN_NEEDED_TO           1
 142 #define FROM_DIRECTION          1
 143 #define FROM_LOOP               internal_ascii_loop
 144 #define TO_LOOP                 internal_ascii_loop /* This is not used.  */
 145 #define FUNCTION_NAME           __gconv_transform_internal_ascii
 146
 147 #define MIN_NEEDED_INPUT        MIN_NEEDED_FROM
 148 #define MIN_NEEDED_OUTPUT       MIN_NEEDED_TO
 149 #define LOOPFCT                 FROM_LOOP
 150 #define BODY \
 151   {                                                                           \
 152     if (*((uint32_t *) inptr) > 0x7f)                                         \
 153       {                                                                       \
 154         /* This is no correct ANSI_X3.4-1968 character.  */                   \
 155         result = GCONV_ILLEGAL_INPUT;                                         \
 156         break;                                                                \
 157       }                                                                       \
 158                                                                               \
 159     /* It's an one byte sequence.  */                                         \
 160     *outptr++ = *((uint32_t *) inptr)++;                                      \
 161   }
 162 #include <iconv/loop.c>
 163 #include <iconv/skeleton.c>
 164
 165
 166 /* Convert from the internal (UCS4-like) format to UTF-8.  */
 167 #define DEFINE_INIT             0
 168 #define DEFINE_FINI             0
 169 #define MIN_NEEDED_FROM         4
 170 #define MIN_NEEDED_TO           1
 171 #define MAX_NEEDED_TO           6
 172 #define FROM_DIRECTION          1
 173 #define FROM_LOOP               internal_utf8_loop
 174 #define TO_LOOP                 internal_utf8_loop /* This is not used.  */
 175 #define FUNCTION_NAME           __gconv_transform_internal_utf8
 176
 177 #define MIN_NEEDED_INPUT        MIN_NEEDED_FROM
 178 #define MIN_NEEDED_OUTPUT       MIN_NEEDED_TO
 179 #define MAX_NEEDED_OUTPUT       MAX_NEEDED_TO
 180 #define LOOPFCT                 FROM_LOOP
 181 #define BODY \
 182   {                                                                           \
 183     uint32_t wc = *((uint32_t *) inptr);                                      \
 184                                                                               \
 185     /* Since we control every character we read this cannot happen.  */       \
 186     assert (wc <= 0x7fffffff);                                                \
 187                                                                               \
 188     if (wc < 0x80)                                                            \
 189       /* It's an one byte sequence.  */                                       \
 190       *outptr++ = (unsigned char) wc;                                         \
 191     else                                                                      \
 192       {                                                                       \
 193         size_t step;                                                          \
 194         char *start;                                                          \
 195                                                                               \
 196         for (step = 2; step < 6; ++step)                                      \
 197           if ((wc & encoding_mask[step - 2]) == 0)                            \
 198             break;                                                            \
 199                                                                               \
 200         if (outptr + step >= outend)                                          \
 201           {                                                                   \
 202             /* Too long.  */                                                  \
 203             result = GCONV_FULL_OUTPUT;                                       \
 204             break;                                                            \
 205           }                                                                   \
 206                                                                               \
 207         start = outptr;                                                       \
 208         *outptr = encoding_byte[step - 2];                                    \
 209         outptr += step;                                                       \
 210         --step;                                                               \
 211         do                                                                    \
 212           {                                                                   \
 213             start[step] = 0x80 | (wc & 0x3f);                                 \
 214             wc >>= 6;                                                         \
 215           }                                                                   \
 216         while (--step > 0);                                                   \
 217         start[0] |= wc;                                                       \
 218       }                                                                       \
 219                                                                               \
 220     inptr += 4;                                                               \
 221   }
 222 #include <iconv/loop.c>
 223 #include <iconv/skeleton.c>
 224
 225
 226 /* Convert from UTF-8 to the internal (UCS4-like) format.  */
 227 #define DEFINE_INIT             0
 228 #define DEFINE_FINI             0
 229 #define MIN_NEEDED_FROM         1
 230 #define MAX_NEEDED_FROM         6
 231 #define MIN_NEEDED_TO           4
 232 #define FROM_DIRECTION          1
 233 #define FROM_LOOP               utf8_internal_loop
 234 #define TO_LOOP                 utf8_internal_loop /* This is not used.  */
 235 #define FUNCTION_NAME           __gconv_transform_utf8_internal
 236
 237 #define MIN_NEEDED_INPUT        MIN_NEEDED_FROM
 238 #define MAX_NEEDED_INPUT        MAX_NEEDED_FROM
 239 #define MIN_NEEDED_OUTPUT       MIN_NEEDED_TO
 240 #define LOOPFCT                 FROM_LOOP
 241 #define BODY \
 242   {                                                                           \
 243     uint32_t ch;                                                              \
 244     uint_fast32_t cnt;                                                        \
 245     uint_fast32_t i;                                                          \
 246                                                                               \
 247     /* Next input byte.  */                                                   \
 248     ch = *inptr;                                                              \
 249                                                                               \
 250     if (ch < 0x80)                                                            \
 251       {                                                                       \
 252         /* One byte sequence.  */                                             \
 253         cnt = 1;                                                              \
 254         ++inptr;                                                              \
 255       }                                                                       \
 256     else                                                                      \
 257       {                                                                       \
 258         if ((ch & 0xe0) == 0xc0)                                              \
 259           {                                                                   \
 260             cnt = 2;                                                          \
 261             ch &= 0x1f;                                                       \
 262           }                                                                   \
 263         else if ((ch & 0xf0) == 0xe0)                                         \
 264           {                                                                   \
 265             /* We expect three bytes.  */                                     \
 266             cnt = 3;                                                          \
 267             ch &= 0x0f;                                                       \
 268           }                                                                   \
 269         else if ((ch & 0xf8) == 0xf0)                                         \
 270           {                                                                   \
 271             /* We expect four bytes.  */                                      \
 272             cnt = 4;                                                          \
 273             ch &= 0x07;                                                       \
 274           }                                                                   \
 275         else if ((ch & 0xfc) == 0xf8)                                         \
 276           {                                                                   \
 277             /* We expect five bytes.  */                                      \
 278             cnt = 5;                                                          \
 279             ch &= 0x03;                                                       \
 280           }                                                                   \
 281         else if ((ch & 0xfe) == 0xfc)                                         \
 282           {                                                                   \
 283             /* We expect six bytes.  */                                       \
 284             cnt = 6;                                                          \
 285             ch &= 0x01;                                                       \
 286           }                                                                   \
 287         else                                                                  \
 288           {                                                                   \
 289             /* This is an illegal encoding.  */                               \
 290             result = GCONV_ILLEGAL_INPUT;                                     \
 291             break;                                                            \
 292           }                                                                   \
 293                                                                               \
 294         if (NEED_LENGTH_TEST && inptr + cnt > inend)                          \
 295           {                                                                   \
 296             /* We don't have enough input.  */                                \
 297             result = GCONV_INCOMPLETE_INPUT;                                  \
 298             break;                                                            \
 299           }                                                                   \
 300                                                                               \
 301         /* Read the possible remaining bytes.  */                             \
 302         for (i = 1; i < cnt; ++i)                                             \
 303           {                                                                   \
 304             uint32_t byte = inptr[i];                                         \
 305                                                                               \
 306             if ((byte & 0xc0) != 0x80)                                        \
 307               {                                                               \
 308                 /* This is an illegal encoding.  */                           \
 309                 result = GCONV_ILLEGAL_INPUT;                                 \
 310                 break;                                                        \
 311               }                                                               \
 312                                                                               \
 313             ch <<= 6;                                                         \
 314             ch |= byte & 0x3f;                                                \
 315           }                                                                   \
 316         inptr += cnt;                                                         \
 317       }                                                                       \
 318                                                                               \
 319     /* Now adjust the pointers and store the result.  */                      \
 320     *((uint32_t *) outptr)++ = ch;                                            \
 321   }
 322 #include <iconv/loop.c>
 323 #include <iconv/skeleton.c>
 324
 325
 326 /* Convert from UCS2 to the internal (UCS4-like) format.  */
 327 #define DEFINE_INIT             0
 328 #define DEFINE_FINI             0
 329 #define MIN_NEEDED_FROM         2
 330 #define MIN_NEEDED_TO           4
 331 #define FROM_DIRECTION          1
 332 #define FROM_LOOP               ucs2_internal_loop
 333 #define TO_LOOP                 ucs2_internal_loop /* This is not used.  */
 334 #define FUNCTION_NAME           __gconv_transform_ucs2_internal
 335
 336 #define MIN_NEEDED_INPUT        MIN_NEEDED_FROM
 337 #define MIN_NEEDED_OUTPUT       MIN_NEEDED_TO
 338 #define LOOPFCT                 FROM_LOOP
 339 #if __BYTE_ORDER == __LITTLE_ENDIAN
 340 # define BODY \
 341   *((uint32_t *) outptr)++ = bswap_16 (*(uint16_t *) inptr);                  \
 342   inptr += 2;
 343 #else
 344 # define BODY \
 345   *((uint32_t *) outptr)++ = *((uint16_t *) inptr)++;
 346 #endif
 347 #include <iconv/loop.c>
 348 #include <iconv/skeleton.c>
 349
 350
 351 /* Convert from the internal (UCS4-like) format to UCS2.  */
 352 #define DEFINE_INIT             0
 353 #define DEFINE_FINI             0
 354 #define MIN_NEEDED_FROM         4
 355 #define MIN_NEEDED_TO           2
 356 #define FROM_DIRECTION          1
 357 #define FROM_LOOP               internal_ucs2_loop
 358 #define TO_LOOP                 internal_ucs2_loop /* This is not used.  */
 359 #define FUNCTION_NAME           __gconv_transform_internal_ucs2
 360
 361 #define MIN_NEEDED_INPUT        MIN_NEEDED_FROM
 362 #define MIN_NEEDED_OUTPUT       MIN_NEEDED_TO
 363 #define LOOPFCT                 FROM_LOOP
 364 #if __BYTE_ORDER == __LITTLE_ENDIAN
 365 # define BODY \
 366   {                                                                           \
 367     if (*((uint32_t *) inptr) >= 0x10000)                                     \
 368       {                                                                       \
 369         result = GCONV_ILLEGAL_INPUT;                                         \
 370         break;                                                                \
 371       }                                                                       \
 372     /* Please note that we use the `uint32_t' from-pointer as an `uint16_t'   \
 373        pointer which works since we are on a little endian machine.  */       \
 374     *((uint16_t *) outptr)++ = bswap_16 (*((uint16_t *) inptr));              \
 375     inptr += 4;                                                               \
 376   }
 377 #else
 378 # define BODY \
 379   {                                                                           \
 380     if (*((uint32_t *) inptr) >= 0x10000)                                     \
 381       {                                                                       \
 382         result = GCONV_ILLEGAL_INPUT;                                         \
 383         break;                                                                \
 384       }                                                                       \
 385     *((uint16_t *) outptr)++ = *((uint32_t *) inptr)++;                       \
 386   }
 387 #endif
 388 #include <iconv/loop.c>
 389 #include <iconv/skeleton.c>
 390
 391
 392 /* Convert from UCS2 in little endian to the internal (UCS4-like) format.  */
 393 #define DEFINE_INIT             0
 394 #define DEFINE_FINI             0
 395 #define MIN_NEEDED_FROM         2
 396 #define MIN_NEEDED_TO           4
 397 #define FROM_DIRECTION          1
 398 #define FROM_LOOP               ucs2little_internal_loop
 399 #define TO_LOOP                 ucs2little_internal_loop /* This is not used.*/
 400 #define FUNCTION_NAME           __gconv_transform_ucs2little_internal
 401
 402 #define MIN_NEEDED_INPUT        MIN_NEEDED_FROM
 403 #define MIN_NEEDED_OUTPUT       MIN_NEEDED_TO
 404 #define LOOPFCT                 FROM_LOOP
 405 #if __BYTE_ORDER == __LITTLE_ENDIAN
 406 # define BODY \
 407   *((uint32_t *) outptr)++ = *((uint16_t *) inptr)++;
 408 #else
 409 # define BODY \
 410   *((uint32_t *) outptr)++ = bswap_16 (*(uint16_t *) inptr);                  \
 411   inptr += 2;
 412 #endif
 413 #include <iconv/loop.c>
 414 #include <iconv/skeleton.c>
 415
 416
 417 /* Convert from the internal (UCS4-like) format to UCS2 in little endian.  */
 418 #define DEFINE_INIT             0
 419 #define DEFINE_FINI             0
 420 #define MIN_NEEDED_FROM         4
 421 #define MIN_NEEDED_TO           2
 422 #define FROM_DIRECTION          1
 423 #define FROM_LOOP               internal_ucs2little_loop
 424 #define TO_LOOP                 internal_ucs2little_loop /* This is not used.*/
 425 #define FUNCTION_NAME           __gconv_transform_internal_ucs2little
 426
 427 #define MIN_NEEDED_INPUT        MIN_NEEDED_FROM
 428 #define MIN_NEEDED_OUTPUT       MIN_NEEDED_TO
 429 #define LOOPFCT                 FROM_LOOP
 430 #if __BYTE_ORDER == __LITTLE_ENDIAN
 431 # define BODY \
 432   {                                                                           \
 433     if (*((uint32_t *) inptr) >= 0x10000)                                     \
 434       {                                                                       \
 435         result = GCONV_ILLEGAL_INPUT;                                         \
 436         break;                                                                \
 437       }                                                                       \
 438     *((uint16_t *) outptr)++ = *((uint32_t *) inptr)++;                       \
 439   }
 440 #else
 441 # define BODY \
 442   {                                                                           \
 443     if (*((uint32_t *) inptr) >= 0x10000)                                     \
 444       {                                                                       \
 445         result = GCONV_ILLEGAL_INPUT;                                         \
 446         break;                                                                \
 447       }                                                                       \
 448     *((uint16_t *) outptr)++ = bswap_16 (((uint16_t *) inptr)[1]);            \
 449     inptr += 4;                                                               \
 450   }
 451 #endif
 452 #include <iconv/loop.c>
 453 #include <iconv/skeleton.c>
 454
 455
 456 /* Convert from the internal (UCS4-like) format to UTF-16.  */
 457 #define DEFINE_INIT             0
 458 #define DEFINE_FINI             0
 459 #define MIN_NEEDED_FROM         4
 460 #define MIN_NEEDED_TO           2
 461 #define MAX_NEEDED_TO           4
 462 #define FROM_DIRECTION          1
 463 #define FROM_LOOP               internal_utf16_loop
 464 #define TO_LOOP                 internal_utf16_loop /* This is not used.  */
 465 #define FUNCTION_NAME           __gconv_transform_internal_utf16
 466
 467 #define MIN_NEEDED_INPUT        MIN_NEEDED_FROM
 468 #define MIN_NEEDED_OUTPUT       MIN_NEEDED_TO
 469 #define MAX_NEEDED_OUTPUT       MAX_NEEDED_TO
 470 #define LOOPFCT                 FROM_LOOP
 471 #if __BYTE_ORDER == __LITTLE_ENDIAN
 472 # define BODY \
 473   {                                                                           \
 474     if (*((uint32_t *) inptr) >= 0x10000)                                     \
 475       {                                                                       \
 476         if (*((uint32_t *) inptr) >= 0x110000)                                \
 477           {                                                                   \
 478             result = GCONV_ILLEGAL_INPUT;                                     \
 479             break;                                                            \
 480           }                                                                   \
 481                                                                               \
 482         /* Generate a surrogate character.  */                                \
 483         if (NEED_LENGTH_TEST && outptr + 4 > outend)                          \
 484           {                                                                   \
 485             /* Overflow in the output buffer.  */                             \
 486             result = GCONV_FULL_OUTPUT;                                       \
 487             break;                                                            \
 488           }                                                                   \
 489                                                                               \
 490         *((uint16_t *) outptr)++ = bswap_16 (0xd7c0                           \
 491                                              + (*((uint32_t *) inptr) >> 10));\
 492         *((uint16_t *) outptr)++ = bswap_16 (0xdc00                           \
 493                                              + (*((uint32_t *) inptr)         \
 494                                                 & 0x3ff));                    \
 495       }                                                                       \
 496     else                                                                      \
 497       /* Please note that we use the `uint32_t' from-pointer as an `uint16_t' \
 498          pointer which works since we are on a little endian machine.  */     \
 499       *((uint16_t *) outptr)++ = bswap_16 (*((uint16_t *) inptr));            \
 500     inptr += 4;                                                               \
 501   }
 502 #else
 503 # define BODY \
 504   {                                                                           \
 505     if (*((uint32_t *) inptr) >= 0x10000)                                     \
 506       {                                                                       \
 507         if (*((uint32_t *) inptr) >= 0x110000)                                \
 508           {                                                                   \
 509             result = GCONV_ILLEGAL_INPUT;                                     \
 510             break;                                                            \
 511           }                                                                   \
 512                                                                               \
 513         /* Generate a surrogate character.  */                                \
 514         if (NEED_LENGTH_TEST && outptr + 4 > outend)                          \
 515           {                                                                   \
 516             /* Overflow in the output buffer.  */                             \
 517             result = GCONV_FULL_OUTPUT;                                       \
 518             break;                                                            \
 519           }                                                                   \
 520                                                                               \
 521         *((uint16_t *) outptr)++ = 0xd7c0 + (*((uint32_t *) inptr) >> 10);    \
 522         *((uint16_t *) outptr)++ = 0xdc00 + (*((uint32_t *) inptr) & 0x3ff);  \
 523       }                                                                       \
 524     else                                                                      \
 525       *((uint16_t *) outptr)++ = *((uint32_t *) inptr)++;                     \
 526   }
 527 #endif
 528 #include <iconv/loop.c>
 529 #include <iconv/skeleton.c>
 530
 531
 532 /* Convert from UTF-16 to the internal (UCS4-like) format.  */
 533 #define DEFINE_INIT             0
 534 #define DEFINE_FINI             0
 535 #define MIN_NEEDED_FROM         2
 536 #define MAX_NEEDED_FROM         4
 537 #define MIN_NEEDED_TO           4
 538 #define FROM_DIRECTION          1
 539 #define FROM_LOOP               utf16_internal_loop
 540 #define TO_LOOP                 utf16_internal_loop /* This is not used.*/
 541 #define FUNCTION_NAME           __gconv_transform_utf16_internal
 542
 543 #define MIN_NEEDED_INPUT        MIN_NEEDED_FROM
 544 #define MAX_NEEDED_INPUT        MAX_NEEDED_FROM
 545 #define MIN_NEEDED_OUTPUT       MIN_NEEDED_TO
 546 #define LOOPFCT                 FROM_LOOP
 547 #if __BYTE_ORDER == __LITTLE_ENDIAN
 548 # define BODY \
 549   {                                                                           \
 550     uint16_t u1 = bswap_16 (*(uint16_t *) inptr);                             \
 551                                                                               \
 552     if (u1 < 0xd800 || u1 > 0xdfff)                                           \
 553       {                                                                       \
 554         /* No surrogate.  */                                                  \
 555         *((uint32_t *) outptr)++ = u1;                                        \
 556         inptr += 2;                                                           \
 557       }                                                                       \
 558     else                                                                      \
 559       {                                                                       \
 560         uint16_t u2;                                                          \
 561                                                                               \
 562         /* It's a surrogate character.  At least the first word says          \
 563            it is.  */                                                         \
 564         if (NEED_LENGTH_TEST && inptr + 4 > inend)                            \
 565           {                                                                   \
 566             /* We don't have enough input for another complete input          \
 567                character.  */                                                 \
 568             result = GCONV_INCOMPLETE_INPUT;                                  \
 569             break;                                                            \
 570           }                                                                   \
 571                                                                               \
 572         u2 = bswap_16 (((uint16_t *) inptr)[1]);                              \
 573         if (u2 < 0xdc00 || u2 >= 0xdfff)                                      \
 574           {                                                                   \
 575             /* This is no valid second word for a surrogate.  */              \
 576             result = GCONV_ILLEGAL_INPUT;                                     \
 577             break;                                                            \
 578           }                                                                   \
 579                                                                               \
 580         *((uint32_t *) outptr)++ = ((u1 - 0xd7c0) << 10) + (u2 - 0xdc00);     \
 581         inptr += 4;                                                           \
 582       }                                                                       \
 583   }
 584 #else
 585 # define BODY \
 586   {                                                                           \
 587     uint16_t u1 = *(uint16_t *) inptr;                                        \
 588                                                                               \
 589     if (u1 < 0xd800 || u1 > 0xdfff)                                           \
 590       {                                                                       \
 591         /* No surrogate.  */                                                  \
 592         *((uint32_t *) outptr)++ = u1;                                        \
 593         inptr += 2;                                                           \
 594       }                                                                       \
 595     else                                                                      \
 596       {                                                                       \
 597         uint16_t u2;                                                          \
 598                                                                               \
 599         /* It's a surrogate character.  At least the first word says          \
 600            it is.  */                                                         \
 601         if (NEED_LENGTH_TEST && inptr + 4 > inend)                            \
 602           {                                                                   \
 603             /* We don't have enough input for another complete input          \
 604                character.  */                                                 \
 605             result = GCONV_INCOMPLETE_INPUT;                                  \
 606             break;                                                            \
 607           }                                                                   \
 608                                                                               \
 609         u2 = ((uint16_t *) inptr)[1];                                         \
 610         if (u2 < 0xdc00 || u2 >= 0xdfff)                                      \
 611           {                                                                   \
 612             /* This is no valid second word for a surrogate.  */              \
 613             result = GCONV_ILLEGAL_INPUT;                                     \
 614             break;                                                            \
 615           }                                                                   \
 616                                                                               \
 617         *((uint32_t *) outptr)++ = ((u1 - 0xd7c0) << 10) + (u2 - 0xdc00);     \
 618         inptr += 4;                                                           \
 619       }                                                                       \
 620   }
 621 #endif
 622 #include <iconv/loop.c>
 623 #include <iconv/skeleton.c>