iconvdata/iso-2022-cn-ext.c

   1 /* Conversion module for ISO-2022-CN-EXT.
   2    Copyright (C) 2000-2024 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <dlfcn.h>
  20 #include <gconv.h>
  21 #include <stdint.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include "gb2312.h"
  25 #include "iso-ir-165.h"
  26 #include "cns11643.h"
  27 #include "cns11643l1.h"
  28 #include "cns11643l2.h"
  29 #include <libc-diag.h>
  30
  31 #include <assert.h>
  32
  33 /* This makes obvious what everybody knows: 0x1b is the Esc character.  */
  34 #define ESC     0x1b
  35
  36 /* We have single-byte shift-in and shift-out sequences, and the single
  37    shift sequences SS2 and SS3 which replaces the SS2/SS3 designation for
  38    the next two bytes.  */
  39 #define SI      0x0f
  40 #define SO      0x0e
  41 #define SS2_0   ESC
  42 #define SS2_1   0x4e
  43 #define SS3_0   ESC
  44 #define SS3_1   0x4f
  45
  46 /* Definitions used in the body of the `gconv' function.  */
  47 #define CHARSET_NAME            "ISO-2022-CN-EXT//"
  48 #define DEFINE_INIT             1
  49 #define DEFINE_FINI             1
  50 #define ONE_DIRECTION           0
  51 #define FROM_LOOP               from_iso2022cn_ext_loop
  52 #define TO_LOOP                 to_iso2022cn_ext_loop
  53 #define FROM_LOOP_MIN_NEEDED_FROM       1
  54 #define FROM_LOOP_MAX_NEEDED_FROM       4
  55 #define FROM_LOOP_MIN_NEEDED_TO         4
  56 #define FROM_LOOP_MAX_NEEDED_TO         4
  57 #define TO_LOOP_MIN_NEEDED_FROM         4
  58 #define TO_LOOP_MAX_NEEDED_FROM         4
  59 #define TO_LOOP_MIN_NEEDED_TO           1
  60 #define TO_LOOP_MAX_NEEDED_TO           6
  61 #define PREPARE_LOOP \
  62   int save_set;                                                               \
  63   int *setp = &data->__statep->__count;
  64 #define EXTRA_LOOP_ARGS         , setp
  65
  66
  67 /* The charsets GB/T 12345-90, GB 7589-87, GB/T 13131-9X, GB 7590-87,
  68    and GB/T 13132-9X are not registered to the best of my knowledge and
  69    therefore have no escape sequence assigned.  We cannot handle them
  70    for this reason.  Tell the implementation about this.  */
  71 #define X12345  '\0'
  72 #define X7589   '\0'
  73 #define X13131  '\0'
  74 #define X7590   '\0'
  75 #define X13132  '\0'
  76
  77
  78 /* The COUNT element of the state keeps track of the currently selected
  79    character set.  The possible values are:  */
  80 enum
  81 {
  82   ASCII_set = 0,
  83   GB2312_set,
  84   GB12345_set,
  85   CNS11643_1_set,
  86   ISO_IR_165_set,
  87   SO_mask = 7,
  88
  89   GB7589_set = 1 << 3,
  90   GB13131_set = 2 << 3,
  91   CNS11643_2_set = 3 << 3,
  92   SS2_mask = 3 << 3,
  93
  94   GB7590_set = 1 << 5,
  95   GB13132_set = 2 << 5,
  96   CNS11643_3_set = 3 << 5,
  97   CNS11643_4_set = 4 << 5,
  98   CNS11643_5_set = 5 << 5,
  99   CNS11643_6_set = 6 << 5,
 100   CNS11643_7_set = 7 << 5,
 101   SS3_mask = 7 << 5,
 102
 103 #define CURRENT_MASK (SO_mask | SS2_mask | SS3_mask)
 104
 105   GB2312_ann = 1 << 8,
 106   GB12345_ann = 2 << 8,
 107   CNS11643_1_ann = 3 << 8,
 108   ISO_IR_165_ann = 4 << 8,
 109   SO_ann = 7 << 8,
 110
 111   GB7589_ann = 1 << 11,
 112   GB13131_ann = 2 << 11,
 113   CNS11643_2_ann = 3 << 11,
 114   SS2_ann = 3 << 11,
 115
 116   GB7590_ann = 1 << 13,
 117   GB13132_ann = 2 << 13,
 118   CNS11643_3_ann = 3 << 13,
 119   CNS11643_4_ann = 4 << 13,
 120   CNS11643_5_ann = 5 << 13,
 121   CNS11643_6_ann = 6 << 13,
 122   CNS11643_7_ann = 7 << 13,
 123   SS3_ann = 7 << 13
 124 };
 125
 126
 127 /* Since this is a stateful encoding we have to provide code which resets
 128    the output state to the initial state.  This has to be done during the
 129    flushing.  */
 130 #define EMIT_SHIFT_TO_INIT \
 131   if (data->__statep->__count >> 3 != ASCII_set)                              \
 132     {                                                                         \
 133       if (FROM_DIRECTION)                                                     \
 134         /* It's easy, we don't have to emit anything, we just reset the       \
 135            state for the input.  */                                           \
 136         data->__statep->__count = ASCII_set << 3;                             \
 137       else                                                                    \
 138         {                                                                     \
 139           /* We are not in the initial state.  To switch back we have         \
 140              to emit `SI'.  */                                                \
 141           if (__glibc_unlikely (outbuf == outend))                            \
 142             /* We don't have enough room in the output buffer.  */            \
 143             status = __GCONV_FULL_OUTPUT;                                     \
 144           else                                                                \
 145             {                                                                 \
 146               /* Write out the shift sequence.  */                            \
 147               *outbuf++ = SI;                                                 \
 148               if (data->__flags & __GCONV_IS_LAST)                            \
 149                 *irreversible += 1;                                           \
 150               data->__statep->__count = ASCII_set << 3;                       \
 151             }                                                                 \
 152         }                                                                     \
 153     }
 154
 155
 156 /* Since we might have to reset input pointer we must be able to save
 157    and restore the state.  */
 158 #define SAVE_RESET_STATE(Save) \
 159   if (Save)                                                                   \
 160     save_set = *setp;                                                         \
 161   else                                                                        \
 162     *setp = save_set
 163
 164
 165 /* First define the conversion function from ISO-2022-CN to UCS4.  */
 166 #define MIN_NEEDED_INPUT        FROM_LOOP_MIN_NEEDED_FROM
 167 #define MAX_NEEDED_INPUT        FROM_LOOP_MAX_NEEDED_FROM
 168 #define MIN_NEEDED_OUTPUT       FROM_LOOP_MIN_NEEDED_TO
 169 #define MAX_NEEDED_OUTPUT       FROM_LOOP_MAX_NEEDED_TO
 170 #define LOOPFCT                 FROM_LOOP
 171 #define BODY \
 172   {                                                                           \
 173     uint32_t ch = *inptr;                                                     \
 174                                                                               \
 175     /* This is a 7bit character set, disallow all 8bit characters.  */        \
 176     if (ch > 0x7f)                                                            \
 177       STANDARD_FROM_LOOP_ERR_HANDLER (1);                                     \
 178                                                                               \
 179     /* Recognize escape sequences.  */                                        \
 180     if (ch == ESC)                                                            \
 181       {                                                                       \
 182         /* There are three kinds of escape sequences we have to handle:       \
 183            - those announcing the use of GB and CNS characters on the         \
 184              line; we can simply ignore them                                  \
 185            - the initial byte of the SS2 sequence.                            \
 186            - the initial byte of the SS3 sequence.                            \
 187         */                                                                    \
 188         if (inptr + 2 > inend                                                 \
 189             || (inptr[1] == '$'                                               \
 190                 && (inptr + 3 > inend                                         \
 191                     || (inptr[2] == ')' && inptr + 4 > inend)                 \
 192                     || (inptr[2] == '*' && inptr + 4 > inend)                 \
 193                     || (inptr[2] == '+' && inptr + 4 > inend)))               \
 194             || (inptr[1] == SS2_1 && inptr + 4 > inend)                       \
 195             || (inptr[1] == SS3_1 && inptr + 4 > inend))                      \
 196           {                                                                   \
 197             result = __GCONV_INCOMPLETE_INPUT;                                \
 198             break;                                                            \
 199           }                                                                   \
 200         if (inptr[1] == '$'                                                   \
 201             && ((inptr[2] == ')'                                              \
 202                  && (inptr[3] == 'A'                                          \
 203                      || (X12345 != '\0' && inptr[3] == X12345)                \
 204                      || inptr[3] == 'E' || inptr[3] == 'G'))                  \
 205                 || (inptr[2] == '*'                                           \
 206                     && ((X7589 != '\0' && inptr[3] == X7589)                  \
 207                         || (X13131 != '\0' && inptr[3] == X13131)             \
 208                         || inptr[3] == 'H'))                                  \
 209                 || (inptr[2] == '+'                                           \
 210                     && ((X7590 != '\0' && inptr[3] == X7590)                  \
 211                         || (X13132 != '\0' && inptr[3] == X13132)             \
 212                         || inptr[3] == 'I' || inptr[3] == 'J'                 \
 213                         || inptr[3] == 'K' || inptr[3] == 'L'                 \
 214                         || inptr[3] == 'M'))))                                \
 215           {                                                                   \
 216             /* OK, we accept those character sets.  */                        \
 217             if (inptr[3] == 'A')                                              \
 218               ann = (ann & ~SO_ann) | GB2312_ann;                             \
 219             else if (inptr[3] == 'G')                                         \
 220               ann = (ann & ~SO_ann) | CNS11643_1_ann;                         \
 221             else if (inptr[3] == 'E')                                         \
 222               ann = (ann & ~SO_ann) | ISO_IR_165_ann;                         \
 223             else if (X12345 != '\0' && inptr[3] == X12345)                    \
 224               ann = (ann & ~SO_ann) | GB12345_ann;                            \
 225             else if (inptr[3] == 'H')                                         \
 226               ann = (ann & ~SS2_ann) | CNS11643_2_ann;                        \
 227             else if (X7589 != '\0' && inptr[3] == X7589)                      \
 228               ann = (ann & ~SS2_ann) | GB7589_ann;                            \
 229             else if (X13131 != '\0' && inptr[3] == X13131)                    \
 230               ann = (ann & ~SS2_ann) | GB13131_ann;                           \
 231             else if (inptr[3] == 'I')                                         \
 232               ann = (ann & ~SS3_ann) | CNS11643_3_ann;                        \
 233             else if (inptr[3] == 'J')                                         \
 234               ann = (ann & ~SS3_ann) | CNS11643_4_ann;                        \
 235             else if (inptr[3] == 'K')                                         \
 236               ann = (ann & ~SS3_ann) | CNS11643_5_ann;                        \
 237             else if (inptr[3] == 'L')                                         \
 238               ann = (ann & ~SS3_ann) | CNS11643_6_ann;                        \
 239             else if (inptr[3] == 'M')                                         \
 240               ann = (ann & ~SS3_ann) | CNS11643_7_ann;                        \
 241             else if (X7590 != '\0' && inptr[3] == X7590)                      \
 242               ann = (ann & ~SS3_ann) | GB7590_ann;                            \
 243             else if (X13132 != '\0' && inptr[3] == X13132)                    \
 244               ann = (ann & ~SS3_ann) | GB13132_ann;                           \
 245             inptr += 4;                                                       \
 246             continue;                                                         \
 247           }                                                                   \
 248       }                                                                       \
 249     else if (ch == SO)                                                        \
 250       {                                                                       \
 251         /* Switch to use GB2312, GB12345, CNS 11643 plane 1, or ISO-IR-165,   \
 252            depending on which S0 designation came last.  The only problem     \
 253            is what to do with faulty input files where no designator came.    \
 254            XXX For now I'll default to use GB2312.  If this is not the        \
 255            best behavior (e.g., we should flag an error) let me know.  */     \
 256         ++inptr;                                                              \
 257         if ((ann & SO_ann) != 0)                                              \
 258           switch (ann & SO_ann)                                               \
 259             {                                                                 \
 260             case GB2312_ann:                                                  \
 261               set = GB2312_set;                                               \
 262               break;                                                          \
 263             case GB12345_ann:                                                 \
 264               set = GB12345_set;                                              \
 265               break;                                                          \
 266             case CNS11643_1_ann:                                              \
 267               set = CNS11643_1_set;                                           \
 268               break;                                                          \
 269             case ISO_IR_165_ann:                                              \
 270               set = ISO_IR_165_set;                                           \
 271               break;                                                          \
 272             default:                                                          \
 273               abort ();                                                       \
 274             }                                                                 \
 275         else                                                                  \
 276           {                                                                   \
 277             STANDARD_FROM_LOOP_ERR_HANDLER (1);                               \
 278           }                                                                   \
 279         continue;                                                             \
 280       }                                                                       \
 281     else if (ch == SI)                                                        \
 282       {                                                                       \
 283         /* Switch to use ASCII.  */                                           \
 284         ++inptr;                                                              \
 285         set = ASCII_set;                                                      \
 286         continue;                                                             \
 287       }                                                                       \
 288                                                                               \
 289     if (ch == ESC && inptr[1] == SS2_1)                                       \
 290       {                                                                       \
 291         /* This is a character from CNS 11643 plane 2.                        \
 292            XXX We could test here whether the use of this character           \
 293            set was announced.                                                 \
 294            XXX Currently GB7589 and GB13131 are not supported.  */            \
 295         inptr += 2;                                                           \
 296         ch = cns11643l2_to_ucs4 (&inptr, 2, 0);                               \
 297         if (ch == __UNKNOWN_10646_CHAR)                                       \
 298           STANDARD_FROM_LOOP_ERR_HANDLER (2);                                 \
 299       }                                                                       \
 300     /* Note that we can assume here that at least 4 bytes are available if    \
 301        the first byte is ESC since otherwise the first if would have been     \
 302        true.  */                                                              \
 303     else if (ch == ESC && inptr[1] == SS3_1)                                  \
 304       {                                                                       \
 305         /* This is a character from CNS 11643 plane 3 or higher.              \
 306            XXX Currently GB7590 and GB13132 are not supported.  */            \
 307         unsigned char buf[3];                                                 \
 308         const unsigned char *tmp = buf;                                       \
 309                                                                               \
 310         buf[1] = inptr[2];                                                    \
 311         buf[2] = inptr[3];                                                    \
 312         switch (ann & SS3_ann)                                                \
 313           {                                                                   \
 314           case CNS11643_3_ann:                                                \
 315             buf[0] = 0x23;                                                    \
 316             ch = cns11643_to_ucs4 (&tmp, 3, 0);                               \
 317             break;                                                            \
 318           case CNS11643_4_ann:                                                \
 319             buf[0] = 0x24;                                                    \
 320             ch = cns11643_to_ucs4 (&tmp, 3, 0);                               \
 321             break;                                                            \
 322           case CNS11643_5_ann:                                                \
 323             buf[0] = 0x25;                                                    \
 324             ch = cns11643_to_ucs4 (&tmp, 3, 0);                               \
 325             break;                                                            \
 326           case CNS11643_6_ann:                                                \
 327             buf[0] = 0x26;                                                    \
 328             ch = cns11643_to_ucs4 (&tmp, 3, 0);                               \
 329             break;                                                            \
 330           case CNS11643_7_ann:                                                \
 331             buf[0] = 0x27;                                                    \
 332             ch = cns11643_to_ucs4 (&tmp, 3, 0);                               \
 333             break;                                                            \
 334           default:                                                            \
 335             /* XXX Currently GB7590 and GB13132 are not supported.  */        \
 336             ch = __UNKNOWN_10646_CHAR;                                        \
 337             break;                                                            \
 338           }                                                                   \
 339         if (ch == __UNKNOWN_10646_CHAR)                                       \
 340           {                                                                   \
 341             STANDARD_FROM_LOOP_ERR_HANDLER (4);                               \
 342           }                                                                   \
 343         assert (tmp == buf + 3);                                              \
 344         inptr += 4;                                                           \
 345       }                                                                       \
 346     else if (set == ASCII_set)                                                \
 347       {                                                                       \
 348         /* Almost done, just advance the input pointer.  */                   \
 349         ++inptr;                                                              \
 350       }                                                                       \
 351     else                                                                      \
 352       {                                                                       \
 353         /* That's pretty easy, we have a dedicated functions for this.  */    \
 354         if (inend - inptr < 2)                                                \
 355           {                                                                   \
 356             result = __GCONV_INCOMPLETE_INPUT;                                \
 357             break;                                                            \
 358           }                                                                   \
 359         if (set == GB2312_set)                                                \
 360           ch = gb2312_to_ucs4 (&inptr, inend - inptr, 0);                     \
 361         else if (set == ISO_IR_165_set)                                       \
 362           ch = isoir165_to_ucs4 (&inptr, inend - inptr);                      \
 363         else                                                                  \
 364           {                                                                   \
 365             assert (set == CNS11643_1_set);                                   \
 366             ch = cns11643l1_to_ucs4 (&inptr, inend - inptr, 0);               \
 367           }                                                                   \
 368                                                                               \
 369         if (ch == 0)                                                          \
 370           {                                                                   \
 371             result = __GCONV_INCOMPLETE_INPUT;                                \
 372             break;                                                            \
 373           }                                                                   \
 374         else if (ch == __UNKNOWN_10646_CHAR)                                  \
 375           {                                                                   \
 376             STANDARD_FROM_LOOP_ERR_HANDLER (2);                               \
 377           }                                                                   \
 378       }                                                                       \
 379                                                                               \
 380     *((uint32_t *) outptr) = ch;                                              \
 381     outptr += sizeof (uint32_t);                                              \
 382   }
 383 #define EXTRA_LOOP_DECLS        , int *setp
 384 #define INIT_PARAMS             int set = (*setp >> 3) & CURRENT_MASK; \
 385                                 int ann = (*setp >> 3) & ~CURRENT_MASK
 386 #define UPDATE_PARAMS           *setp = (set | ann) << 3
 387 #define LOOP_NEED_FLAGS
 388 #include <iconv/loop.c>
 389
 390
 391 /* Next, define the other direction.  */
 392 #define MIN_NEEDED_INPUT        TO_LOOP_MIN_NEEDED_FROM
 393 #define MAX_NEEDED_INPUT        TO_LOOP_MAX_NEEDED_FROM
 394 #define MIN_NEEDED_OUTPUT       TO_LOOP_MIN_NEEDED_TO
 395 #define MAX_NEEDED_OUTPUT       TO_LOOP_MAX_NEEDED_TO
 396 #define LOOPFCT                 TO_LOOP
 397 /* With GCC 5.3 when compiling with -Os the compiler emits a warning
 398    that buf[0] and buf[1] may be used uninitialized.  This can only
 399    happen in the case where tmpbuf[3] is used, and in that case the
 400    write to the tmpbuf[1] and tmpbuf[2] was assured because
 401    ucs4_to_cns11643 would have filled in those entries.  The difficulty
 402    is in getting the compiler to see this logic because tmpbuf[0] is
 403    involved in determining the code page and is the indicator that
 404    tmpbuf[2] is initialized.  */
 405 DIAG_PUSH_NEEDS_COMMENT;
 406 DIAG_IGNORE_Os_NEEDS_COMMENT (5, "-Wmaybe-uninitialized");
 407 #define BODY \
 408   {                                                                           \
 409     uint32_t ch;                                                              \
 410     size_t written = 0;                                                       \
 411                                                                               \
 412     ch = *((const uint32_t *) inptr);                                         \
 413                                                                               \
 414     /* First see whether we can write the character using the currently       \
 415        selected character set.  */                                            \
 416     if (ch < 0x80)                                                            \
 417       {                                                                       \
 418         if (set != ASCII_set)                                                 \
 419           {                                                                   \
 420             *outptr++ = SI;                                                   \
 421             set = ASCII_set;                                                  \
 422             if (outptr == outend)                                             \
 423               {                                                               \
 424                 result = __GCONV_FULL_OUTPUT;                                 \
 425                 break;                                                        \
 426               }                                                               \
 427           }                                                                   \
 428                                                                               \
 429         *outptr++ = ch;                                                       \
 430         written = 1;                                                          \
 431                                                                               \
 432         /* At the end of the line we have to clear the `ann' flags since      \
 433            every line must contain this information again.  */                \
 434         if (ch == L'\n')                                                      \
 435           ann = 0;                                                            \
 436       }                                                                       \
 437     else                                                                      \
 438       {                                                                       \
 439         unsigned char buf[2] = { 0, 0 };                                      \
 440         int used;                                                             \
 441                                                                               \
 442         if (set == GB2312_set || ((ann & SO_ann) != CNS11643_1_ann            \
 443                                   && (ann & SO_ann) != ISO_IR_165_ann))       \
 444           {                                                                   \
 445             written = ucs4_to_gb2312 (ch, buf, 2);                            \
 446             used = GB2312_set;                                                \
 447           }                                                                   \
 448         else if (set == ISO_IR_165_set || (ann & SO_ann) == ISO_IR_165_set)   \
 449           {                                                                   \
 450             written = ucs4_to_isoir165 (ch, buf, 2);                          \
 451             used = ISO_IR_165_set;                                            \
 452           }                                                                   \
 453         else                                                                  \
 454           {                                                                   \
 455             written = ucs4_to_cns11643l1 (ch, buf, 2);                        \
 456             used = CNS11643_1_set;                                            \
 457           }                                                                   \
 458                                                                               \
 459         if (written == __UNKNOWN_10646_CHAR)                                  \
 460           {                                                                   \
 461             /* Cannot convert it using the currently selected SO set.         \
 462                Next try the SS2 set.  */                                      \
 463             written = ucs4_to_cns11643l2 (ch, buf, 2);                        \
 464             if (written != __UNKNOWN_10646_CHAR)                              \
 465               /* Yep, that worked.  */                                        \
 466               used = CNS11643_2_set;                                          \
 467             else                                                              \
 468               {                                                               \
 469                 unsigned char tmpbuf[3];                                      \
 470                                                                               \
 471                 switch (0)                                                    \
 472                   {                                                           \
 473                   default:                                                    \
 474                     /* Well, see whether we have to change the SO set.  */    \
 475                                                                               \
 476                     if (used != GB2312_set)                                   \
 477                       {                                                       \
 478                         written = ucs4_to_gb2312 (ch, buf, 2);                \
 479                         if (written != __UNKNOWN_10646_CHAR)                  \
 480                           {                                                   \
 481                             used = GB2312_set;                                \
 482                             break;                                            \
 483                           }                                                   \
 484                       }                                                       \
 485                                                                               \
 486                     if (used != ISO_IR_165_set)                               \
 487                       {                                                       \
 488                         written = ucs4_to_isoir165 (ch, buf, 2);              \
 489                         if (written != __UNKNOWN_10646_CHAR)                  \
 490                           {                                                   \
 491                             used = ISO_IR_165_set;                            \
 492                             break;                                            \
 493                           }                                                   \
 494                       }                                                       \
 495                                                                               \
 496                     if (used != CNS11643_1_set)                               \
 497                       {                                                       \
 498                         written = ucs4_to_cns11643l1 (ch, buf, 2);            \
 499                         if (written != __UNKNOWN_10646_CHAR)                  \
 500                           {                                                   \
 501                             used = CNS11643_1_set;                            \
 502                             break;                                            \
 503                           }                                                   \
 504                       }                                                       \
 505                                                                               \
 506                     written = ucs4_to_cns11643 (ch, tmpbuf, 3);               \
 507                     if (written == 3 && tmpbuf[0] >= 3 && tmpbuf[0] <= 7)     \
 508                       {                                                       \
 509                         buf[0] = tmpbuf[1];                                   \
 510                         buf[1] = tmpbuf[2];                                   \
 511                         switch (tmpbuf[0])                                    \
 512                           {                                                   \
 513                           case 3:                                             \
 514                             used = CNS11643_3_set;                            \
 515                             break;                                            \
 516                           case 4:                                             \
 517                             used = CNS11643_4_set;                            \
 518                             break;                                            \
 519                           case 5:                                             \
 520                             used = CNS11643_5_set;                            \
 521                             break;                                            \
 522                           case 6:                                             \
 523                             used = CNS11643_6_set;                            \
 524                             break;                                            \
 525                           case 7:                                             \
 526                             used = CNS11643_7_set;                            \
 527                             break;                                            \
 528                           default:                                            \
 529                             abort ();                                         \
 530                           }                                                   \
 531                         written = 2;                                          \
 532                         break;                                                \
 533                       }                                                       \
 534                                                                               \
 535                     /* XXX Currently GB7590 and GB13132 are not supported.  */\
 536                                                                               \
 537                     /* Even this does not work.  Error.  */                   \
 538                     used = ASCII_set;                                         \
 539                   }                                                           \
 540                 if (used == ASCII_set)                                        \
 541                   {                                                           \
 542                     UNICODE_TAG_HANDLER (ch, 4);                              \
 543                     STANDARD_TO_LOOP_ERR_HANDLER (4);                         \
 544                   }                                                           \
 545               }                                                               \
 546           }                                                                   \
 547         assert (written == 2);                                                \
 548                                                                               \
 549         /* See whether we have to emit an escape sequence.  */                \
 550         if (set != used)                                                      \
 551           {                                                                   \
 552             /* First see whether we announced that we use this                \
 553                character set.  */                                             \
 554             if ((used & SO_mask) != 0 && (ann & SO_ann) != (used << 8))       \
 555               {                                                               \
 556                 const char *escseq;                                           \
 557                                                                               \
 558                 if (outptr + 4 > outend)                                      \
 559                   {                                                           \
 560                     result = __GCONV_FULL_OUTPUT;                             \
 561                     break;                                                    \
 562                   }                                                           \
 563                                                                               \
 564                 assert (used >= 1 && used <= 4);                              \
 565                 escseq = ")A\0\0)G)E" + (used - 1) * 2;                       \
 566                 *outptr++ = ESC;                                              \
 567                 *outptr++ = '$';                                              \
 568                 *outptr++ = *escseq++;                                        \
 569                 *outptr++ = *escseq++;                                        \
 570                                                                               \
 571                 ann = (ann & ~SO_ann) | (used << 8);                          \
 572               }                                                               \
 573             else if ((used & SS2_mask) != 0 && (ann & SS2_ann) != (used << 8))\
 574               {                                                               \
 575                 const char *escseq;                                           \
 576                                                                               \
 577                 assert (used == CNS11643_2_set); /* XXX */                    \
 578                 escseq = "*H";                                                \
 579                 *outptr++ = ESC;                                              \
 580                 *outptr++ = '$';                                              \
 581                 *outptr++ = *escseq++;                                        \
 582                 *outptr++ = *escseq++;                                        \
 583                                                                               \
 584                 ann = (ann & ~SS2_ann) | (used << 8);                         \
 585               }                                                               \
 586             else if ((used & SS3_mask) != 0 && (ann & SS3_ann) != (used << 8))\
 587               {                                                               \
 588                 const char *escseq;                                           \
 589                                                                               \
 590                 assert ((used >> 5) >= 3 && (used >> 5) <= 7);                \
 591                 escseq = "+I+J+K+L+M" + ((used >> 5) - 3) * 2;                \
 592                 *outptr++ = ESC;                                              \
 593                 *outptr++ = '$';                                              \
 594                 *outptr++ = *escseq++;                                        \
 595                 *outptr++ = *escseq++;                                        \
 596                                                                               \
 597                 ann = (ann & ~SS3_ann) | (used << 8);                         \
 598               }                                                               \
 599                                                                               \
 600             if (used == CNS11643_2_set)                                       \
 601               {                                                               \
 602                 if (outptr + 2 > outend)                                      \
 603                   {                                                           \
 604                     result = __GCONV_FULL_OUTPUT;                             \
 605                     break;                                                    \
 606                   }                                                           \
 607                 *outptr++ = SS2_0;                                            \
 608                 *outptr++ = SS2_1;                                            \
 609               }                                                               \
 610             else if (used >= CNS11643_3_set && used <= CNS11643_7_set)        \
 611               {                                                               \
 612                 if (outptr + 2 > outend)                                      \
 613                   {                                                           \
 614                     result = __GCONV_FULL_OUTPUT;                             \
 615                     break;                                                    \
 616                   }                                                           \
 617                 *outptr++ = SS3_0;                                            \
 618                 *outptr++ = SS3_1;                                            \
 619               }                                                               \
 620             else                                                              \
 621               {                                                               \
 622                 /* We only have to emit something if currently ASCII is       \
 623                    selected.  Otherwise we are switching within the           \
 624                    SO charset.  */                                            \
 625                 if (set == ASCII_set)                                         \
 626                   {                                                           \
 627                     if (outptr + 1 > outend)                                  \
 628                       {                                                       \
 629                         result = __GCONV_FULL_OUTPUT;                         \
 630                         break;                                                \
 631                       }                                                       \
 632                     *outptr++ = SO;                                           \
 633                   }                                                           \
 634               }                                                               \
 635                                                                               \
 636             /* Always test the length here since we have used up all the      \
 637                guaranteed output buffer slots.  */                            \
 638             if (outptr + 2 > outend)                                          \
 639               {                                                               \
 640                 result = __GCONV_FULL_OUTPUT;                                 \
 641                 break;                                                        \
 642               }                                                               \
 643           }                                                                   \
 644         else if (outptr + 2 > outend)                                         \
 645           {                                                                   \
 646             result = __GCONV_FULL_OUTPUT;                                     \
 647             break;                                                            \
 648           }                                                                   \
 649                                                                               \
 650         *outptr++ = buf[0];                                                   \
 651         *outptr++ = buf[1];                                                   \
 652         set = used;                                                           \
 653       }                                                                       \
 654                                                                               \
 655     /* Now that we wrote the output increment the input pointer.  */          \
 656     inptr += 4;                                                               \
 657   }
 658 DIAG_POP_NEEDS_COMMENT;
 659 #define EXTRA_LOOP_DECLS        , int *setp
 660 #define INIT_PARAMS             int set = (*setp >> 3) & CURRENT_MASK; \
 661                                 int ann = (*setp >> 3) & ~CURRENT_MASK
 662 #define REINIT_PARAMS           do                                            \
 663                                   {                                           \
 664                                     set = (*setp >> 3) & CURRENT_MASK;        \
 665                                     ann = (*setp >> 3) & ~CURRENT_MASK;       \
 666                                   }                                           \
 667                                 while (0)
 668 #define UPDATE_PARAMS           *setp = (set | ann) << 3
 669 #define LOOP_NEED_FLAGS
 670 #include <iconv/loop.c>
 671
 672
 673 /* Now define the toplevel functions.  */
 674 #include <iconv/skeleton.c>