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iso-2022-cn-ext.c

/* Conversion module for ISO-2022-CN-EXT.
   Copyright (C) 2000-2002 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@cygnus.com>, 2000.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include <dlfcn.h>
#include <gconv.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "gb2312.h"
#include "iso-ir-165.h"
#include "cns11643.h"
#include "cns11643l1.h"
#include "cns11643l2.h"

#include <assert.h>

/* This makes obvious what everybody knows: 0x1b is the Esc character.  */
#define ESC 0x1b

/* We have single-byte shift-in and shift-out sequences, and the single
   shift sequences SS2 and SS3 which replaces the SS2/SS3 designation for
   the next two bytes.  */
#define SI  0x0f
#define SO  0x0e
#define SS2_0     ESC
#define SS2_1     0x4e
#define SS3_0     ESC
#define SS3_1     0x4f

/* Definitions used in the body of the `gconv' function.  */
#define CHARSET_NAME          "ISO-2022-CN-EXT//"
#define DEFINE_INIT           1
#define DEFINE_FINI           1
#define FROM_LOOP       from_iso2022cn_ext_loop
#define TO_LOOP               to_iso2022cn_ext_loop
#define FROM_LOOP_MIN_NEEDED_FROM   1
#define FROM_LOOP_MAX_NEEDED_FROM   4
#define FROM_LOOP_MIN_NEEDED_TO           4
#define FROM_LOOP_MAX_NEEDED_TO           4
#define TO_LOOP_MIN_NEEDED_FROM           4
#define TO_LOOP_MAX_NEEDED_FROM           4
#define TO_LOOP_MIN_NEEDED_TO       1
#define TO_LOOP_MAX_NEEDED_TO       6
#define PREPARE_LOOP \
  int save_set;                                                   \
  int *setp = &data->__statep->__count;
#define EXTRA_LOOP_ARGS       , setp


/* The charsets GB/T 12345-90, GB 7589-87, GB/T 13131-9X, GB 7590-87,
   and GB/T 13132-9X are not registered to the best of my knowledge and
   therefore have no escape sequence assigned.  We cannot handle them
   for this reason.  Tell the implementation about this.  */
#define X12345    '\0'
#define X7589     '\0'
#define X13131    '\0'
#define X7590     '\0'
#define X13132    '\0'


/* The COUNT element of the state keeps track of the currently selected
   character set.  The possible values are:  */
enum
{
  ASCII_set = 0,
  GB2312_set,
  GB12345_set,
  CNS11643_1_set,
  ISO_IR_165_set,
  SO_mask = 7,

  GB7589_set = 1 << 3,
  GB13131_set = 2 << 3,
  CNS11643_2_set = 3 << 3,
  SS2_mask = 3 << 3,

  GB7590_set = 1 << 5,
  GB13132_set = 2 << 5,
  CNS11643_3_set = 3 << 5,
  CNS11643_4_set = 4 << 5,
  CNS11643_5_set = 5 << 5,
  CNS11643_6_set = 6 << 5,
  CNS11643_7_set = 7 << 5,
  SS3_mask = 7 << 5,

#define CURRENT_MASK (SO_mask | SS2_mask | SS3_mask)

  GB2312_ann = 1 << 8,
  GB12345_ann = 2 << 8,
  CNS11643_1_ann = 3 << 8,
  ISO_IR_165_ann = 4 << 8,
  SO_ann = 7 << 8,

  GB7589_ann = 1 << 11,
  GB13131_ann = 2 << 11,
  CNS11643_2_ann = 3 << 11,
  SS2_ann = 3 << 11,

  GB7590_ann = 1 << 13,
  GB13132_ann = 2 << 13,
  CNS11643_3_ann = 3 << 13,
  CNS11643_4_ann = 4 << 13,
  CNS11643_5_ann = 5 << 13,
  CNS11643_6_ann = 6 << 13,
  CNS11643_7_ann = 7 << 13,
  SS3_ann = 7 << 13
};


/* Since this is a stateful encoding we have to provide code which resets
   the output state to the initial state.  This has to be done during the
   flushing.  */
#define EMIT_SHIFT_TO_INIT \
  if (data->__statep->__count >> 3 != ASCII_set)                        \
    {                                                       \
      if (FROM_DIRECTION)                                         \
      /* It's easy, we don't have to emit anything, we just reset the         \
         state for the input.  */                                 \
      data->__statep->__count = ASCII_set << 3;                   \
      else                                                  \
      {                                                     \
        /* We are not in the initial state.  To switch back we have           \
           to emit `SI'.  */                                      \
        if (__builtin_expect (outbuf == outend, 0))                     \
          /* We don't have enough room in the output buffer.  */        \
          status = __GCONV_FULL_OUTPUT;                           \
        else                                                      \
          {                                                 \
            /* Write out the shift sequence.  */                        \
            *outbuf++ = SI;                                       \
            if (data->__flags & __GCONV_IS_LAST)                        \
            *irreversible += 1;                                   \
            data->__statep->__count = ASCII_set << 3;                   \
          }                                                 \
      }                                                     \
    }


/* Since we might have to reset input pointer we must be able to save
   and retore the state.  */
#define SAVE_RESET_STATE(Save) \
  if (Save)                                                 \
    save_set = *setp;                                             \
  else                                                            \
    *setp = save_set


/* First define the conversion function from ISO-2022-CN to UCS4.  */
#define MIN_NEEDED_INPUT      FROM_LOOP_MIN_NEEDED_FROM
#define MAX_NEEDED_INPUT      FROM_LOOP_MAX_NEEDED_FROM
#define MIN_NEEDED_OUTPUT     FROM_LOOP_MIN_NEEDED_TO
#define MAX_NEEDED_OUTPUT     FROM_LOOP_MAX_NEEDED_TO
#define LOOPFCT               FROM_LOOP
#define BODY \
  {                                                         \
    uint32_t ch = *inptr;                                         \
                                                            \
    /* This is a 7bit character set, disallow all 8bit characters.  */        \
    if (ch > 0x7f)                                                \
      STANDARD_FROM_LOOP_ERR_HANDLER (1);                         \
                                                            \
    /* Recognize escape sequences.  */                                  \
    if (ch == ESC)                                                \
      {                                                           \
      /* There are three kinds of escape sequences we have to handle:         \
         - those announcing the use of GB and CNS characters on the           \
           line; we can simply ignore them                              \
         - the initial byte of the SS2 sequence.                        \
         - the initial byte of the SS3 sequence.                        \
      */                                                    \
      if (inptr + 2 > inend                                       \
          || (inptr[1] == '$'                                     \
            && (inptr + 3 > inend                                 \
                || (inptr[2] == ')' && inptr + 4 > inend)               \
                || (inptr[2] == '*' && inptr + 4 > inend)               \
                || (inptr[2] == '+' && inptr + 4 > inend)))             \
          || (inptr[1] == SS2_1 && inptr + 4 > inend)                   \
          || (inptr[1] == SS3_1 && inptr + 4 > inend))                  \
        {                                                   \
          result = __GCONV_INCOMPLETE_INPUT;                            \
          break;                                            \
        }                                                   \
      if (inptr[1] == '$'                                         \
          && ((inptr[2] == ')'                                    \
             && (inptr[3] == 'A'                                  \
                 || (X12345 != '\0' && inptr[3] == X12345)              \
                 || inptr[3] == 'E' || inptr[3] == 'G'))                \
            || (inptr[2] == '*'                                   \
                && ((X7589 != '\0' && inptr[3] == X7589)                \
                  || (X13131 != '\0' && inptr[3] == X13131)       \
                  || inptr[3] == 'H'))                            \
            || (inptr[2] == '+'                                   \
                && ((X7590 != '\0' && inptr[3] == X7590)                \
                  || (X13132 != '\0' && inptr[3] == X13132)       \
                  || inptr[3] == 'I' || inptr[3] == 'J'                 \
                  || inptr[3] == 'K' || inptr[3] == 'L'                 \
                  || inptr[3] == 'M'))))                          \
        {                                                   \
          /* OK, we accept those character sets.  */                    \
          if (inptr[3] == 'A')                                    \
            ann = (ann & ~SO_ann) | GB2312_ann;                   \
          else if (inptr[3] == 'G')                               \
            ann = (ann & ~SO_ann) | CNS11643_1_ann;                     \
          else if (inptr[3] == 'E')                               \
            ann = (ann & ~SO_ann) | ISO_IR_165_ann;                     \
          else if (X12345 != '\0' && inptr[3] == X12345)                \
            ann = (ann & ~SO_ann) | GB12345_ann;                        \
          else if (inptr[3] == 'H')                               \
            ann = (ann & ~SS2_ann) | CNS11643_2_ann;                    \
          else if (X7589 != '\0' && inptr[3] == X7589)                  \
            ann = (ann & ~SS2_ann) | GB7589_ann;                        \
          else if (X13131 != '\0' && inptr[3] == X13131)                \
            ann = (ann & ~SS2_ann) | GB13131_ann;                       \
          else if (inptr[3] == 'I')                               \
            ann = (ann & ~SS3_ann) | CNS11643_3_ann;                    \
          else if (inptr[3] == 'J')                               \
            ann = (ann & ~SS3_ann) | CNS11643_4_ann;                    \
          else if (inptr[3] == 'K')                               \
            ann = (ann & ~SS3_ann) | CNS11643_5_ann;                    \
          else if (inptr[3] == 'L')                               \
            ann = (ann & ~SS3_ann) | CNS11643_6_ann;                    \
          else if (inptr[3] == 'M')                               \
            ann = (ann & ~SS3_ann) | CNS11643_7_ann;                    \
          else if (X7590 != '\0' && inptr[3] == X7590)                  \
            ann = (ann & ~SS3_ann) | GB7590_ann;                        \
          else if (X13132 != '\0' && inptr[3] == X13132)                \
            ann = (ann & ~SS3_ann) | GB13132_ann;                       \
          inptr += 4;                                             \
          continue;                                               \
        }                                                   \
      }                                                           \
    else if (ch == SO)                                            \
      {                                                           \
      /* Switch to use GB2312, GB12345, CNS 11643 plane 1, or ISO-IR-165,   \
         depending on which S0 designation came last.  The only problem     \
         is what to do with faulty input files where no designator came.    \
         XXX For now I'll default to use GB2312.  If this is not the          \
         best behavior (e.g., we should flag an error) let me know.  */     \
      ++inptr;                                              \
      if ((ann & SO_ann) != 0)                                    \
        switch (ann & SO_ann)                                     \
          {                                                 \
          case GB2312_ann:                                        \
            set = GB2312_set;                                     \
            break;                                                \
          case GB12345_ann:                                       \
            set = GB12345_set;                                    \
            break;                                                \
          case CNS11643_1_ann:                                    \
            set = CNS11643_1_set;                                 \
            break;                                                \
          case ISO_IR_165_ann:                                    \
            set = ISO_IR_165_set;                                 \
            break;                                                \
          default:                                                \
            abort ();                                             \
          }                                                 \
      else                                                  \
        {                                                   \
          STANDARD_FROM_LOOP_ERR_HANDLER (1);                           \
        }                                                   \
      continue;                                             \
      }                                                           \
    else if (ch == SI)                                            \
      {                                                           \
      /* Switch to use ASCII.  */                                 \
      ++inptr;                                              \
      set = ASCII_set;                                      \
      continue;                                             \
      }                                                           \
                                                            \
    if (ch == ESC && inptr[1] == SS2_1)                                 \
      {                                                           \
      /* This is a character from CNS 11643 plane 2.                    \
         XXX We could test here whether the use of this character       \
         set was announced.                                       \
         XXX Currently GB7589 and GB13131 are not supported.  */        \
      inptr += 2;                                           \
      ch = cns11643l2_to_ucs4 (&inptr, 2, 0);                           \
      if (ch == __UNKNOWN_10646_CHAR)                                   \
        STANDARD_FROM_LOOP_ERR_HANDLER (2);                             \
      }                                                           \
    /* Note that we can assume here that at least 4 bytes are available if    \
       the first byte is ESC since otherwise the first if would have been     \
       true.  */                                            \
    else if (ch == ESC && inptr[1] == SS3_1)                            \
      {                                                           \
      /* This is a character from CNS 11643 plane 3 or higher.          \
         XXX Currently GB7590 and GB13132 are not supported.  */        \
      char buf[3];                                                \
      const char *tmp = buf;                                      \
                                                            \
      buf[1] = inptr[2];                                          \
      buf[2] = inptr[3];                                          \
      switch (ann & SS3_ann)                                      \
        {                                                   \
        case CNS11643_3_ann:                                      \
          buf[0] = 0x23;                                          \
          ch = cns11643_to_ucs4 (&tmp, 3, 0);                           \
          break;                                            \
        case CNS11643_4_ann:                                      \
          buf[0] = 0x24;                                          \
          ch = cns11643_to_ucs4 (&tmp, 3, 0);                           \
          break;                                            \
        case CNS11643_5_ann:                                      \
          buf[0] = 0x25;                                          \
          ch = cns11643_to_ucs4 (&tmp, 3, 0);                           \
          break;                                            \
        case CNS11643_6_ann:                                      \
          buf[0] = 0x26;                                          \
          ch = cns11643_to_ucs4 (&tmp, 3, 0);                           \
          break;                                            \
        case CNS11643_7_ann:                                      \
          buf[0] = 0x27;                                          \
          ch = cns11643_to_ucs4 (&tmp, 3, 0);                           \
          break;                                            \
        default:                                            \
          /* XXX Currently GB7590 and GB13132 are not supported.  */          \
          ch = __UNKNOWN_10646_CHAR;                                    \
          break;                                            \
        }                                                   \
      if (ch == __UNKNOWN_10646_CHAR)                                   \
        {                                                   \
          STANDARD_FROM_LOOP_ERR_HANDLER (4);                           \
        }                                                   \
      assert (tmp == buf + 3);                                    \
      inptr += 4;                                           \
      }                                                           \
    else if (set == ASCII_set)                                          \
      {                                                           \
      /* Almost done, just advance the input pointer.  */               \
      ++inptr;                                              \
      }                                                           \
    else                                                    \
      {                                                           \
      /* That's pretty easy, we have a dedicated functions for this.  */    \
      if (inend - inptr < 2)                                      \
        {                                                   \
          result = __GCONV_INCOMPLETE_INPUT;                            \
          break;                                            \
        }                                                   \
      if (set == GB2312_set)                                      \
        ch = gb2312_to_ucs4 (&inptr, inend - inptr, 0);                 \
      else if (set == ISO_IR_165_set)                                   \
        ch = isoir165_to_ucs4 (&inptr, inend - inptr);                  \
      else                                                  \
        {                                                   \
          assert (set == CNS11643_1_set);                         \
          ch = cns11643l1_to_ucs4 (&inptr, inend - inptr, 0);                 \
        }                                                   \
                                                            \
      if (ch == 0)                                                \
        {                                                   \
          result = __GCONV_INCOMPLETE_INPUT;                            \
          break;                                            \
        }                                                   \
      else if (ch == __UNKNOWN_10646_CHAR)                              \
        {                                                   \
          STANDARD_FROM_LOOP_ERR_HANDLER (2);                           \
        }                                                   \
      }                                                           \
                                                            \
    *((uint32_t *) outptr)++ = ch;                                \
  }
#define EXTRA_LOOP_DECLS      , int *setp
#define INIT_PARAMS           int set = (*setp >> 3) & CURRENT_MASK; \
                        int ann = (*setp >> 3) & ~CURRENT_MASK
#define UPDATE_PARAMS         *setp = (set | ann) << 3
#define LOOP_NEED_FLAGS
#include <iconv/loop.c>


/* Next, define the other direction.  */
#define MIN_NEEDED_INPUT      TO_LOOP_MIN_NEEDED_FROM
#define MAX_NEEDED_INPUT      TO_LOOP_MAX_NEEDED_FROM
#define MIN_NEEDED_OUTPUT     TO_LOOP_MIN_NEEDED_TO
#define MAX_NEEDED_OUTPUT     TO_LOOP_MAX_NEEDED_TO
#define LOOPFCT               TO_LOOP
#define BODY \
  {                                                         \
    uint32_t ch;                                            \
    size_t written = 0;                                           \
                                                            \
    ch = *((const uint32_t *) inptr);                                   \
                                                            \
    /* First see whether we can write the character using the currently       \
       selected character set.  */                                \
    if (ch < 0x80)                                                \
      {                                                           \
      if (set != ASCII_set)                                       \
        {                                                   \
          *outptr++ = SI;                                         \
          set = ASCII_set;                                        \
          if (outptr == outend)                                   \
            {                                                     \
            result = __GCONV_FULL_OUTPUT;                         \
            break;                                                \
            }                                                     \
        }                                                   \
                                                            \
      *outptr++ = ch;                                             \
      written = 1;                                                \
                                                            \
      /* At the end of the line we have to clear the `ann' flags since      \
         every line must contain this information again.  */                  \
      if (ch == L'\n')                                      \
        ann = 0;                                            \
      }                                                           \
    else                                                    \
      {                                                           \
      char buf[2];                                                \
      int used;                                             \
                                                            \
      if (set == GB2312_set || ((ann & SO_ann) != CNS11643_1_ann        \
                          && (ann & SO_ann) != ISO_IR_165_ann))         \
        {                                                   \
          written = ucs4_to_gb2312 (ch, buf, 2);                        \
          used = GB2312_set;                                      \
        }                                                   \
      else if (set == ISO_IR_165_set || (ann & SO_ann) == ISO_IR_165_set)   \
        {                                                   \
          written = ucs4_to_isoir165 (ch, buf, 2);                      \
          used = ISO_IR_165_set;                                  \
        }                                                   \
      else                                                  \
        {                                                   \
          written = ucs4_to_cns11643l1 (ch, buf, 2);                    \
          used = CNS11643_1_set;                                  \
        }                                                   \
                                                            \
      if (written == __UNKNOWN_10646_CHAR)                              \
        {                                                   \
          /* Cannot convert it using the currently selected SO set.           \
             Next try the SS2 set.  */                            \
          written = ucs4_to_cns11643l2 (ch, buf, 2);                    \
          if (written != __UNKNOWN_10646_CHAR)                    \
            /* Yep, that worked.  */                                    \
            used = CNS11643_2_set;                                \
          else                                              \
            {                                                     \
            char tmpbuf[3];                                       \
                                                            \
            switch (0)                                      \
              {                                             \
              default:                                      \
                /* Well, see whether we have to change the SO set.  */    \
                                                            \
                if (used != GB2312_set)                           \
                  {                                               \
                  written = ucs4_to_gb2312 (ch, buf, 2);                \
                  if (written != __UNKNOWN_10646_CHAR)                  \
                    {                                       \
                      used = GB2312_set;                          \
                      break;                                \
                    }                                       \
                  }                                               \
                                                            \
                if (used != ISO_IR_165_set)                             \
                  {                                               \
                  written = ucs4_to_isoir165 (ch, buf, 2);        \
                  if (written != __UNKNOWN_10646_CHAR)                  \
                    {                                       \
                      used = ISO_IR_165_set;                      \
                      break;                                \
                    }                                       \
                  }                                               \
                                                            \
                if (used != CNS11643_1_set)                             \
                  {                                               \
                  written = ucs4_to_cns11643l1 (ch, buf, 2);            \
                  if (written != __UNKNOWN_10646_CHAR)                  \
                    {                                       \
                      used = CNS11643_1_set;                      \
                      break;                                \
                    }                                       \
                  }                                               \
                                                            \
                written = ucs4_to_cns11643 (ch, tmpbuf, 3);             \
                if (written == 3 && tmpbuf[0] >= 3 && tmpbuf[0] <= 7)     \
                  {                                               \
                  buf[0] = tmpbuf[1];                             \
                  buf[1] = tmpbuf[2];                             \
                  switch (tmpbuf[0])                              \
                    {                                       \
                    case 3:                                 \
                      used = CNS11643_3_set;                      \
                      break;                                \
                    case 4:                                 \
                      used = CNS11643_4_set;                      \
                      break;                                \
                    case 5:                                 \
                      used = CNS11643_5_set;                      \
                      break;                                \
                    case 6:                                 \
                      used = CNS11643_6_set;                      \
                      break;                                \
                    case 7:                                 \
                      used = CNS11643_7_set;                      \
                      break;                                \
                    default:                                \
                      abort ();                                   \
                    }                                       \
                  written = 2;                                    \
                  break;                                          \
                  }                                               \
                                                            \
                /* XXX Currently GB7590 and GB13132 are not supported.  */\
                                                            \
                /* Even this does not work.  Error.  */                 \
                used = ASCII_set;                                 \
              }                                             \
            if (used == ASCII_set)                                \
              {                                             \
                UNICODE_TAG_HANDLER (ch, 4);                      \
                STANDARD_TO_LOOP_ERR_HANDLER (4);                       \
              }                                             \
            }                                                     \
        }                                                   \
      assert (written == 2);                                      \
                                                            \
      /* See whether we have to emit an escape sequence.  */                  \
      if (set != used)                                      \
        {                                                   \
          /* First see whether we announced that we use this                  \
             character set.  */                                   \
          if ((used & SO_mask) != 0 && (ann & SO_ann) != (used << 8))         \
            {                                                     \
            const char *escseq;                                   \
                                                            \
            if (outptr + 4 > outend)                              \
              {                                             \
                result = __GCONV_FULL_OUTPUT;                     \
                break;                                      \
              }                                             \
                                                            \
            assert (used >= 1 && used <= 4);                      \
            escseq = ")A\0\0)G)E" + (used - 1) * 2;                     \
            *outptr++ = ESC;                                \
            *outptr++ = '$';                                \
            *outptr++ = *escseq++;                                \
            *outptr++ = *escseq++;                                \
                                                            \
            ann = (ann & ~SO_ann) | (used << 8);                        \
            }                                                     \
          else if ((used & SS2_mask) != 0 && (ann & SS2_ann) != (used << 8))\
            {                                                     \
            const char *escseq;                                   \
                                                            \
            assert (used == CNS11643_2_set); /* XXX */                  \
            escseq = "*H";                                        \
            *outptr++ = ESC;                                \
            *outptr++ = '$';                                \
            *outptr++ = *escseq++;                                \
            *outptr++ = *escseq++;                                \
                                                            \
            ann = (ann & ~SS2_ann) | (used << 8);                       \
            }                                                     \
          else if ((used & SS3_mask) != 0 && (ann & SS3_ann) != (used << 8))\
            {                                                     \
            const char *escseq;                                   \
                                                            \
            assert ((used >> 5) >= 3 && (used >> 5) <= 7);              \
            escseq = "+I+J+K+L+M" + ((used >> 5) - 3) * 2;              \
            *outptr++ = ESC;                                \
            *outptr++ = '$';                                \
            *outptr++ = *escseq++;                                \
            *outptr++ = *escseq++;                                \
                                                            \
            ann = (ann & ~SS3_ann) | (used << 8);                       \
            }                                                     \
                                                            \
          if (used == CNS11643_2_set)                                   \
            {                                                     \
            if (outptr + 2 > outend)                              \
              {                                             \
                result = __GCONV_FULL_OUTPUT;                     \
                break;                                      \
              }                                             \
            *outptr++ = SS2_0;                                    \
            *outptr++ = SS2_1;                                    \
            }                                                     \
          else if (used >= CNS11643_3_set && used <= CNS11643_7_set)          \
            {                                                     \
            if (outptr + 2 > outend)                              \
              {                                             \
                result = __GCONV_FULL_OUTPUT;                     \
                break;                                      \
              }                                             \
            *outptr++ = SS3_0;                                    \
            *outptr++ = SS3_1;                                    \
            }                                                     \
          else                                              \
            {                                                     \
            /* We only have to emit something if currently ASCII is           \
               selected.  Otherwise we are switching within the         \
               SO charset.  */                                    \
            if (set == ASCII_set)                                 \
              {                                             \
                if (outptr + 1 > outend)                          \
                  {                                               \
                  result = __GCONV_FULL_OUTPUT;                   \
                  break;                                          \
                  }                                               \
                *outptr++ = SO;                                   \
              }                                             \
            }                                                     \
                                                            \
          /* Always test the length here since we have used up all the      \
             guaranteed output buffer slots.  */                        \
          if (outptr + 2 > outend)                                \
            {                                                     \
            result = __GCONV_FULL_OUTPUT;                         \
            break;                                                \
            }                                                     \
        }                                                   \
      else if (outptr + 2 > outend)                               \
        {                                                   \
          result = __GCONV_FULL_OUTPUT;                           \
          break;                                            \
        }                                                   \
                                                            \
      *outptr++ = buf[0];                                         \
      *outptr++ = buf[1];                                         \
      set = used;                                           \
      }                                                           \
                                                            \
    /* Now that we wrote the output increment the input pointer.  */          \
    inptr += 4;                                                   \
  }
#define EXTRA_LOOP_DECLS      , int *setp
#define INIT_PARAMS           int set = (*setp >> 3) & CURRENT_MASK; \
                        int ann = (*setp >> 3) & ~CURRENT_MASK
#define UPDATE_PARAMS         *setp = (set | ann) << 3
#define LOOP_NEED_FLAGS
#include <iconv/loop.c>


/* Now define the toplevel functions.  */
#include <iconv/skeleton.c>

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