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tscii.c

/* Conversion from and to TSCII.
   Copyright (C) 2002 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Bruno Haible <bruno@clisp.org>, 2002.

   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 <stdint.h>
#include <gconv.h>
#include <assert.h>

/* TSCII is an 8-bit encoding consisting of:
   0x00..0x7F:       ASCII
   0x80..0x90, 0x95..0x9F, 0xAB..0xFE:
                     Tamil letters and glyphs
   0xA1..0xA5, 0xAA: Tamil combining letters (after the base character)
   0xA6..0xA8:       Tamil combining letters (before the base character)
   0x91..0x94:       Punctuation
   0xA9:             Symbols
*/

/* Definitions used in the body of the `gconv' function.  */
#define CHARSET_NAME          "TSCII//"
#define FROM_LOOP       from_tscii
#define TO_LOOP               to_tscii
#define DEFINE_INIT           1
#define DEFINE_FINI           1
#define FROM_LOOP_MIN_NEEDED_FROM   1
#define FROM_LOOP_MAX_NEEDED_FROM   2
#define FROM_LOOP_MIN_NEEDED_TO           4
#define FROM_LOOP_MAX_NEEDED_TO            16
#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       3
#define PREPARE_LOOP \
  int saved_state;                                                \
  int *statep = &data->__statep->__count;
#define EXTRA_LOOP_ARGS       , statep


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


/* During TSCII to UCS-4 conversion, the COUNT element of the state contains
   the last UCS-4 character to be output, shifted by 8 bits, and an encoded
   representation of additional UCS-4 characters to be output (if any),
   shifted by 4 bits.  This character can be:
     0x0000                   Nothing pending.
     0x0BCD                   Pending VIRAMA sign. If bit 3 is set, it may be
                              omitted if followed by a vowel sign U or UU.
     0x0BC6, 0x0BC7, 0x0BC8   Pending vowel sign.  Bit 3 is set after the
                              consonant was seen.
     Other                    Bit 3 always cleared.  */

/* During UCS-4 to TSCII conversion, the COUNT element of the state contains
   the last byte (or sometimes the last two bytes) to be output, shifted by
   3 bits. This can be:
     0x00                     Nothing pending.
     0xB8..0xC9, 0x83..0x86   A consonant.
     0xEC, 0x8A               A consonant with VIRAMA sign (final or joining).
     0x87, 0xC38A             Two consonants combined through a VIRAMA sign. */

/* 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 != 0)                               \
    {                                                       \
      if (FROM_DIRECTION)                                         \
      {                                                     \
        do                                                  \
          {                                                 \
            if (__builtin_expect (outbuf + 4 > outend, 0))              \
            {                                               \
              /* We don't have enough room in the output buffer.  */      \
              status = __GCONV_FULL_OUTPUT;                             \
              break;                                        \
            }                                               \
            /* Write out the pending character.  */                     \
            *((uint32_t *) outbuf)++ = data->__statep->__count >> 8;          \
            /* Retrieve the successor state.  */                        \
            data->__statep->__count =                                   \
            tscii_next_state[(data->__statep->__count >> 4) & 0x0f];      \
          }                                                 \
        while (data->__statep->__count != 0);                           \
      }                                                     \
      else                                                  \
      {                                                     \
        uint32_t last = data->__statep->__count >> 3;                   \
        if (__builtin_expect (last >> 8, 0))                            \
          {                                                 \
            /* Write out the last character, two bytes.  */             \
            if (__builtin_expect (outbuf + 2 <= outend, 1))             \
            {                                               \
              *outbuf++ = last & 0xff;                            \
              *outbuf++ = (last >> 8) & 0xff;                     \
              data->__statep->__count = 0;                              \
            }                                               \
            else                                            \
            /* We don't have enough room in the output buffer.  */            \
            status = __GCONV_FULL_OUTPUT;                         \
          }                                                 \
        else                                                      \
          {                                                 \
            /* Write out the last character, a single byte.  */         \
            if (__builtin_expect (outbuf < outend, 1))                  \
            {                                               \
              *outbuf++ = last & 0xff;                            \
              data->__statep->__count = 0;                              \
            }                                               \
            else                                            \
            /* We don't have enough room in the output buffer.  */            \
            status = __GCONV_FULL_OUTPUT;                         \
          }                                                 \
      }                                                     \
    }


/* First define the conversion function from TSCII to UCS-4.  */

static const uint16_t tscii_to_ucs4[128][2] =
  {
    { 0x0BE6,      0 },
    { 0x0BE7,      0 },
    {      0,      0 }, /* 0x82 - maps to <U0BB8><U0BCD><U0BB0><U0BC0> */
    { 0x0B9C,      0 },
    { 0x0BB7,      0 },
    { 0x0BB8,      0 },
    { 0x0BB9,      0 },
    {      0,      0 }, /* 0x87 - maps to <U0B95><U0BCD><U0BB7> */
    { 0x0B9C, 0x0BCD },
    { 0x0BB7, 0x0BCD },
    {      0,      0 }, /* 0x8a - maps to <U0BB8> and buffers <U0BCD> */
    {      0,      0 }, /* 0x8b - maps to <U0BB9> and buffers <U0BCD> */
    {      0,      0 }, /* 0x8c - maps to <U0B95><U0BCD><U0BB7><U0BCD> */
    { 0x0BE8,      0 },
    { 0x0BE9,      0 },
    { 0x0BEA,      0 },
    { 0x0BEB,      0 },
    { 0x2018,      0 },
    { 0x2019,      0 },
    { 0x201C,      0 },
    { 0x201D,      0 },
    { 0x0BEC,      0 },
    { 0x0BED,      0 },
    { 0x0BEE,      0 },
    { 0x0BEF,      0 },
    { 0x0B99, 0x0BC1 },
    { 0x0B9E, 0x0BC1 },
    { 0x0B99, 0x0BC2 },
    { 0x0B9E, 0x0BC2 },
    { 0x0BF0,      0 },
    { 0x0BF1,      0 },
    { 0x0BF2,      0 },
    {      0,      0 }, /* 0xa0 - unmapped */
    { 0x0BBE,      0 },
    { 0x0BBF,      0 },
    { 0x0BC0,      0 },
    { 0x0BC1,      0 },
    { 0x0BC2,      0 },
    {      0,      0 }, /* 0xa6 - buffers <U0BC6> */
    {      0,      0 }, /* 0xa7 - buffers <U0BC7> */
    {      0,      0 }, /* 0xa8 - buffers <U0BC8> */
    { 0x00A9,      0 },
    { 0x0BD7,      0 },
    { 0x0B85,      0 },
    { 0x0B86,      0 },
    { 0x0B87,      0 },
    { 0x0B88,      0 },
    { 0x0B89,      0 },
    { 0x0B8A,      0 },
    { 0x0B8E,      0 },
    { 0x0B8F,      0 },
    { 0x0B90,      0 },
    { 0x0B92,      0 },
    { 0x0B93,      0 },
    { 0x0B94,      0 },
    { 0x0B83,      0 },
    { 0x0B95,      0 },
    { 0x0B99,      0 },
    { 0x0B9A,      0 },
    { 0x0B9E,      0 },
    { 0x0B9F,      0 },
    { 0x0BA3,      0 },
    { 0x0BA4,      0 },
    { 0x0BA8,      0 },
    { 0x0BAA,      0 },
    { 0x0BAE,      0 },
    { 0x0BAF,      0 },
    { 0x0BB0,      0 },
    { 0x0BB2,      0 },
    { 0x0BB5,      0 },
    { 0x0BB4,      0 },
    { 0x0BB3,      0 },
    { 0x0BB1,      0 },
    { 0x0BA9,      0 },
    { 0x0B9F, 0x0BBF },
    { 0x0B9F, 0x0BC0 },
    { 0x0B95, 0x0BC1 },
    { 0x0B9A, 0x0BC1 },
    { 0x0B9F, 0x0BC1 },
    { 0x0BA3, 0x0BC1 },
    { 0x0BA4, 0x0BC1 },
    { 0x0BA8, 0x0BC1 },
    { 0x0BAA, 0x0BC1 },
    { 0x0BAE, 0x0BC1 },
    { 0x0BAF, 0x0BC1 },
    { 0x0BB0, 0x0BC1 },
    { 0x0BB2, 0x0BC1 },
    { 0x0BB5, 0x0BC1 },
    { 0x0BB4, 0x0BC1 },
    { 0x0BB3, 0x0BC1 },
    { 0x0BB1, 0x0BC1 },
    { 0x0BA9, 0x0BC1 },
    { 0x0B95, 0x0BC2 },
    { 0x0B9A, 0x0BC2 },
    { 0x0B9F, 0x0BC2 },
    { 0x0BA3, 0x0BC2 },
    { 0x0BA4, 0x0BC2 },
    { 0x0BA8, 0x0BC2 },
    { 0x0BAA, 0x0BC2 },
    { 0x0BAE, 0x0BC2 },
    { 0x0BAF, 0x0BC2 },
    { 0x0BB0, 0x0BC2 },
    { 0x0BB2, 0x0BC2 },
    { 0x0BB5, 0x0BC2 },
    { 0x0BB4, 0x0BC2 },
    { 0x0BB3, 0x0BC2 },
    { 0x0BB1, 0x0BC2 },
    { 0x0BA9, 0x0BC2 },
    { 0x0B95, 0x0BCD },
    { 0x0B99, 0x0BCD },
    { 0x0B9A, 0x0BCD },
    { 0x0B9E, 0x0BCD },
    { 0x0B9F, 0x0BCD },
    { 0x0BA3, 0x0BCD },
    { 0x0BA4, 0x0BCD },
    { 0x0BA8, 0x0BCD },
    { 0x0BAA, 0x0BCD },
    { 0x0BAE, 0x0BCD },
    { 0x0BAF, 0x0BCD },
    { 0x0BB0, 0x0BCD },
    { 0x0BB2, 0x0BCD },
    { 0x0BB5, 0x0BCD },
    { 0x0BB4, 0x0BCD },
    { 0x0BB3, 0x0BCD },
    { 0x0BB1, 0x0BCD },
    { 0x0BA9, 0x0BCD },
    { 0x0B87,      0 },
    {      0,      0 }  /* 0xff - unmapped */
  };

static const uint32_t tscii_next_state[6] =
  {
    /* 0 means no more pending Unicode characters.  */
    0,
    /* 1 means <U0BB7>.  */
    (0x0BB7 << 8),
    /* 2 means <U0BC0>.  */
    (0x0BC0 << 8),
    /* 3 means <U0BCD>.  */
    (0x0BCD << 8),
    /* 4 means <U0BB0><U0BC0>.  */
    (0x0BB0 << 8) + (2 << 4),
    /* 5 means <U0BB7><U0BCD>.  */
    (0x0BB7 << 8) + (3 << 4)
  };

#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;                                         \
                                                            \
    if ((*statep >> 8) != 0)                                      \
      {                                                           \
      /* Attempt to combine the last character with this one.  */       \
      uint32_t last = *statep >> 8;                               \
                                                            \
      if (last == 0x0BCD && (*statep & (1 << 3)))                       \
        {                                                   \
          if (ch == 0xa4 || ch == 0xa5)                           \
            {                                                     \
            ch += 0xb1d;                                          \
            /* Now ch = 0x0BC1 or ch = 0x0BC2.  */                      \
            put32 (outptr, ch);                                   \
            outptr += 4;                                          \
            *statep = 0;                                          \
            inptr++;                                        \
            continue;                                       \
            }                                                     \
        }                                                   \
      else if (last >= 0x0BC6 && last <= 0x0BC8)                        \
        {                                                   \
          if ((last == 0x0BC6 && ch == 0xa1)                            \
            || (last == 0x0BC7 && (ch == 0xa1 || ch == 0xaa)))          \
            {                                                     \
            ch = last + 4 + (ch != 0xa1);                         \
            /* Now ch = 0x0BCA or ch = 0x0BCB or ch = 0x0BCC.  */       \
            put32 (outptr, ch);                                   \
            outptr += 4;                                          \
            *statep = 0;                                          \
            inptr++;                                        \
            continue;                                       \
            }                                                     \
          if ((ch >= 0xb8 && ch <= 0xc9) && (*statep & (1 << 3)) == 0)      \
            {                                                     \
            ch = tscii_to_ucs4[ch - 0x80][0];                     \
            put32 (outptr, ch);                                   \
            outptr += 4;                                          \
            *statep |= 1 << 3;                                    \
            inptr++;                                        \
            continue;                                       \
            }                                                     \
        }                                                   \
                                                            \
      do                                                    \
        {                                                   \
          /* Output the buffered character.  */                   \
          put32 (outptr, last);                                   \
          outptr += 4;                                      \
          /* Retrieve the successor state.  */                    \
          *statep = tscii_next_state[(*statep >> 4) & 0x0f];                  \
        }                                                   \
      while (*statep != 0 && __builtin_expect (outptr + 4 <= outend, 1));   \
                                                            \
      if (*statep != 0)                                     \
        {                                                   \
          /* We don't have enough room in the output buffer.                  \
             Tell the caller why we terminate the loop.  */             \
          result = __GCONV_FULL_OUTPUT;                           \
          break;                                            \
        }                                                   \
                                                            \
      continue;                                             \
      }                                                           \
                                                            \
    if (ch < 0x80)                                                \
      {                                                           \
      /* Plain ASCII character.  */                               \
      put32 (outptr, ch);                                         \
      outptr += 4;                                                \
      }                                                           \
    else                                                    \
      {                                                           \
      /* Tamil character.  */                                     \
      uint32_t u1 = tscii_to_ucs4[ch - 0x80][0];                        \
                                                            \
      if (u1 != 0)                                                \
        {                                                   \
          uint32_t u2 = tscii_to_ucs4[ch - 0x80][1];                    \
                                                            \
          inptr++;                                                \
                                                            \
          put32 (outptr, u1);                                     \
          outptr += 4;                                      \
                                                            \
          if (u2 != 0)                                      \
            {                                                     \
            /* See whether we have room for two characters.  Otherwise    \
               store only the first character now, and put the second     \
               one into the queue.  */                            \
            if (__builtin_expect (outptr + 4 > outend, 0))              \
              {                                             \
                *statep = u2 << 8;                                \
                result = __GCONV_FULL_OUTPUT;                     \
                break;                                      \
              }                                             \
            put32 (outptr, u2);                                   \
            outptr += 4;                                          \
            }                                                     \
          continue;                                               \
        }                                                   \
      /* Special handling of a few Tamil characters.  */                \
      else if (ch == 0xa6 || ch == 0xa7 || ch == 0xa8)                  \
        {                                                   \
          ch += 0x0b20;                                     \
          /* Now ch = 0x0BC6 or ch = 0x0BC7 or ch = 0x0BC8.  */         \
          *statep = ch << 8;                                      \
          inptr++;                                                \
          continue;                                               \
        }                                                   \
      else if (ch == 0x8a || ch == 0x8b)                          \
        {                                                   \
          ch += 0x0b2e;                                     \
          /* Now ch = 0x0BB8 or ch = 0x0BB9.  */                        \
          put32 (outptr, ch);                                     \
          outptr += 4;                                      \
          *statep = (0x0BCD << 8) + (1 << 3);                           \
          inptr++;                                                \
          continue;                                               \
        }                                                   \
      else if (ch == 0x82)                                        \
        {                                                   \
          /* Output <U0BB8><U0BCD><U0BB0><U0BC0>, if we have room for         \
             four characters.  */                                 \
          inptr++;                                                \
          put32 (outptr, 0x0BB8);                                 \
          outptr += 4;                                      \
          if (__builtin_expect (outptr + 4 > outend, 0))                \
            {                                                     \
            *statep = (0x0BCD << 8) + (4 << 4);                   \
            result = __GCONV_FULL_OUTPUT;                         \
            break;                                                \
            }                                                     \
          put32 (outptr, 0x0BCD);                                 \
          outptr += 4;                                      \
          if (__builtin_expect (outptr + 4 > outend, 0))                \
            {                                                     \
            *statep = (0x0BB0 << 8) + (2 << 4);                   \
            result = __GCONV_FULL_OUTPUT;                         \
            break;                                                \
            }                                                     \
          put32 (outptr, 0x0BB0);                                 \
          outptr += 4;                                      \
          if (__builtin_expect (outptr + 4 > outend, 0))                \
            {                                                     \
            *statep = (0x0BC0 << 8);                              \
            result = __GCONV_FULL_OUTPUT;                         \
            break;                                                \
            }                                                     \
          put32 (outptr, 0x0BC0);                                 \
          outptr += 4;                                      \
          continue;                                               \
        }                                                   \
      else if (ch == 0x87)                                        \
        {                                                   \
          /* Output <U0B95><U0BCD><U0BB7>, if we have room for          \
             three characters.  */                                \
          inptr++;                                                \
          put32 (outptr, 0x0B95);                                 \
          outptr += 4;                                      \
          if (__builtin_expect (outptr + 4 > outend, 0))                \
            {                                                     \
            *statep = (0x0BCD << 8) + (1 << 4);                   \
            result = __GCONV_FULL_OUTPUT;                         \
            break;                                                \
            }                                                     \
          put32 (outptr, 0x0BCD);                                 \
          outptr += 4;                                      \
          if (__builtin_expect (outptr + 4 > outend, 0))                \
            {                                                     \
            *statep = (0x0BB7 << 8);                              \
            result = __GCONV_FULL_OUTPUT;                         \
            break;                                                \
            }                                                     \
          put32 (outptr, 0x0BB7);                                 \
          outptr += 4;                                      \
          continue;                                               \
        }                                                   \
      else if (ch == 0x8c)                                        \
        {                                                   \
          /* Output <U0B95><U0BCD><U0BB7><U0BCD>, if we have room for         \
             four characters.  */                                 \
          inptr++;                                                \
          put32 (outptr, 0x0B95);                                 \
          outptr += 4;                                      \
          if (__builtin_expect (outptr + 4 > outend, 0))                \
            {                                                     \
            *statep = (0x0BCD << 8) + (5 << 4);                   \
            result = __GCONV_FULL_OUTPUT;                         \
            break;                                                \
            }                                                     \
          put32 (outptr, 0x0BCD);                                 \
          outptr += 4;                                      \
          if (__builtin_expect (outptr + 4 > outend, 0))                \
            {                                                     \
            *statep = (0x0BB7 << 8) + (3 << 4);                   \
            result = __GCONV_FULL_OUTPUT;                         \
            break;                                                \
            }                                                     \
          put32 (outptr, 0x0BB7);                                 \
          outptr += 4;                                      \
          if (__builtin_expect (outptr + 4 > outend, 0))                \
            {                                                     \
            *statep = (0x0BCD << 8);                              \
            result = __GCONV_FULL_OUTPUT;                         \
            break;                                                \
            }                                                     \
          put32 (outptr, 0x0BCD);                                 \
          outptr += 4;                                      \
          continue;                                               \
        }                                                   \
      else                                                  \
        {                                                   \
          /* This is illegal.  */                                 \
          STANDARD_FROM_LOOP_ERR_HANDLER (1);                           \
        }                                                   \
      }                                                           \
                                                            \
    /* Now that we wrote the output increment the input pointer.  */          \
    inptr++;                                                      \
  }
#define LOOP_NEED_FLAGS
#define EXTRA_LOOP_DECLS      , int *statep
#include <iconv/loop.c>


/* Next, define the other direction, from UCS-4 to TSCII.  */

static const uint8_t ucs4_to_tscii[128] =
  {
       0,    0,    0, 0xb7,    0, 0xab, 0xac, 0xfe, /* 0x0B80..0x0B87 */
    0xae, 0xaf, 0xb0,    0,    0,    0, 0xb1, 0xb2, /* 0x0B88..0x0B8F */
    0xb3,    0, 0xb4, 0xb5, 0xb6, 0xb8,    0,    0, /* 0x0B90..0x0B97 */
       0, 0xb9, 0xba,    0, 0x83,    0, 0xbb, 0xbc, /* 0x0B98..0x0B9F */
       0,    0,    0, 0xbd, 0xbe,    0,    0,    0, /* 0x0BA0..0x0BA7 */
    0xbf, 0xc9, 0xc0,    0,    0,    0, 0xc1, 0xc2, /* 0x0BA8..0x0BAF */
    0xc3, 0xc8, 0xc4, 0xc7, 0xc6, 0xc5,    0, 0x84, /* 0x0BB0..0x0BB7 */
    0x85, 0x86,    0,    0,    0,    0, 0xa1, 0xa2, /* 0x0BB8..0x0BBF */
    0xa3, 0xa4, 0xa5,    0,    0,    0, 0xa6, 0xa7, /* 0x0BC0..0x0BC7 */
    0xa8,    0,    0,    0,    0,    0,    0,    0, /* 0x0BC8..0x0BCF */
       0,    0,    0,    0,    0,    0,    0, 0xaa, /* 0x0BD0..0x0BD7 */
       0,    0,    0,    0,    0,    0,    0,    0, /* 0x0BD8..0x0BDF */
       0,    0,    0,    0,    0,    0, 0x80, 0x81, /* 0x0BE0..0x0BE7 */
    0x8d, 0x8e, 0x8f, 0x90, 0x95, 0x96, 0x97, 0x98, /* 0x0BE8..0x0BEF */
    0x9d, 0x9e, 0x9f,    0,    0,    0,    0,    0, /* 0x0BF0..0x0BF7 */
       0,    0,    0,    0,    0,    0,    0,    0  /* 0x0BF8..0x0BFF */
  };

static const uint8_t consonant_with_u[18] =
  {
    0xcc, 0x99, 0xcd, 0x9a, 0xce, 0xcf, 0xd0, 0xd1, 0xd2,
    0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xdb
  };

static const uint8_t consonant_with_uu[18] =
  {
    0xdc, 0x9b, 0xdd, 0x9c, 0xde, 0xdf, 0xe0, 0xe1, 0xe2,
    0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, 0xeb
  };

static const uint8_t consonant_with_virama[18] =
  {
    0xec, 0xed, 0xee, 0xef, 0xf0, 0xf1, 0xf2, 0xf3, 0xf4,
    0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd
  };

#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 = get32 (inptr);                                  \
                                                            \
    if ((*statep >> 3) != 0)                                      \
      {                                                           \
      /* Attempt to combine the last character with this one.  */       \
      uint32_t last = *statep >> 3;                               \
                                                            \
      if (last >= 0xb8 && last <= 0xc9)                           \
        {                                                   \
          if (ch == 0x0BC1)                                       \
            {                                                     \
            *outptr++ = consonant_with_u[last - 0xb8];                  \
            *statep = 0;                                          \
            inptr += 4;                                     \
            continue;                                       \
            }                                                     \
          if (ch == 0x0BC2)                                       \
            {                                                     \
            *outptr++ = consonant_with_uu[last - 0xb8];                 \
            *statep = 0;                                          \
            inptr += 4;                                     \
            continue;                                       \
            }                                                     \
          if (ch == 0x0BC6)                                       \
            {                                                     \
            if (__builtin_expect (outptr + 2 <= outend, 1))             \
              {                                             \
                *outptr++ = 0xa6;                                 \
                *outptr++ = last;                                 \
                *statep = 0;                                \
                inptr += 4;                                       \
                continue;                                         \
              }                                             \
            else                                            \
              {                                             \
                result = __GCONV_FULL_OUTPUT;                     \
                break;                                      \
              }                                             \
            }                                                     \
          if (ch == 0x0BC7)                                       \
            {                                                     \
            if (__builtin_expect (outptr + 2 <= outend, 1))             \
              {                                             \
                *outptr++ = 0xa7;                                 \
                *outptr++ = last;                                 \
                *statep = 0;                                \
                inptr += 4;                                       \
                continue;                                         \
              }                                             \
            else                                            \
              {                                             \
                result = __GCONV_FULL_OUTPUT;                     \
                break;                                      \
              }                                             \
            }                                                     \
          if (ch == 0x0BC8)                                       \
            {                                                     \
            if (__builtin_expect (outptr + 2 <= outend, 1))             \
              {                                             \
                *outptr++ = 0xa8;                                 \
                *outptr++ = last;                                 \
                *statep = 0;                                \
                inptr += 4;                                       \
                continue;                                         \
              }                                             \
            else                                            \
              {                                             \
                result = __GCONV_FULL_OUTPUT;                     \
                break;                                      \
              }                                             \
            }                                                     \
          if (ch == 0x0BCA)                                       \
            {                                                     \
            if (__builtin_expect (outptr + 3 <= outend, 1))             \
              {                                             \
                *outptr++ = 0xa6;                                 \
                *outptr++ = last;                                 \
                *outptr++ = 0xa1;                                 \
                *statep = 0;                                \
                inptr += 4;                                       \
                continue;                                         \
              }                                             \
            else                                            \
              {                                             \
                result = __GCONV_FULL_OUTPUT;                     \
                break;                                      \
              }                                             \
            }                                                     \
          if (ch == 0x0BCB)                                       \
            {                                                     \
            if (__builtin_expect (outptr + 3 <= outend, 1))             \
              {                                             \
                *outptr++ = 0xa7;                                 \
                *outptr++ = last;                                 \
                *outptr++ = 0xa1;                                 \
                *statep = 0;                                \
                inptr += 4;                                       \
                continue;                                         \
              }                                             \
            else                                            \
              {                                             \
                result = __GCONV_FULL_OUTPUT;                     \
                break;                                      \
              }                                             \
            }                                                     \
          if (ch == 0x0BCC)                                       \
            {                                                     \
            if (__builtin_expect (outptr + 3 <= outend, 1))             \
              {                                             \
                *outptr++ = 0xa7;                                 \
                *outptr++ = last;                                 \
                *outptr++ = 0xaa;                                 \
                *statep = 0;                                \
                inptr += 4;                                       \
                continue;                                         \
              }                                             \
            else                                            \
              {                                             \
                result = __GCONV_FULL_OUTPUT;                     \
                break;                                      \
              }                                             \
            }                                                     \
          if (ch == 0x0BCD)                                       \
            {                                                     \
            if (last != 0xb8)                               \
              {                                             \
                *outptr++ = consonant_with_virama[last - 0xb8];         \
                *statep = 0;                                \
              }                                             \
            else                                            \
              *statep = 0xec << 3;                                \
            inptr += 4;                                     \
            continue;                                       \
            }                                                     \
          if (last == 0xbc && (ch == 0x0BBF || ch == 0x0BC0))                 \
            {                                                     \
            *outptr++ = ch - 0x0af5;                              \
            *statep = 0;                                          \
            inptr += 4;                                     \
            continue;                                       \
            }                                                     \
        }                                                   \
      else if (last >= 0x83 && last <= 0x86)                            \
        {                                                   \
          if (last >= 0x85 && (ch == 0x0BC1 || ch == 0x0BC2))                 \
            {                                                     \
            *outptr++ = last + 5;                                 \
            *statep = 0;                                          \
            continue;                                       \
            }                                                     \
          if (ch == 0x0BCD)                                       \
            {                                                     \
            if (last != 0x85)                               \
              {                                             \
                *outptr++ = last + 5;                             \
                *statep = 0;                                \
              }                                             \
            else                                            \
              *statep = 0x8a << 3;                                \
            inptr += 4;                                     \
            continue;                                       \
            }                                                     \
        }                                                   \
      else if (last == 0xec)                                      \
        {                                                   \
          if (ch == 0x0BB7)                                       \
            {                                                     \
            *statep = 0x87 << 3;                                  \
            inptr += 4;                                     \
            continue;                                       \
            }                                                     \
        }                                                   \
      else if (last == 0x8a)                                      \
        {                                                   \
          if (ch == 0x0BB0)                                       \
            {                                                     \
            *statep = 0xc38a << 3;                                \
            inptr += 4;                                     \
            continue;                                       \
            }                                                     \
        }                                                   \
      else if (last == 0x87)                                      \
        {                                                   \
          if (ch == 0x0BCD)                                       \
            {                                                     \
            *outptr++ = 0x8c;                               \
            *statep = 0;                                          \
            inptr += 4;                                     \
            continue;                                       \
            }                                                     \
        }                                                   \
      else                                                  \
        {                                                   \
          assert (last == 0xc38a);                                \
          if (ch == 0x0BC0)                                       \
            {                                                     \
            *outptr++ = 0x82;                               \
            *statep = 0;                                          \
            inptr += 4;                                     \
            continue;                                       \
            }                                                     \
        }                                                   \
                                                            \
      /* Output the buffered character.  */                             \
      if (__builtin_expect (last >> 8, 0))                              \
        {                                                   \
          if (__builtin_expect (outptr + 2 <= outend, 1))               \
            {                                                     \
            *outptr++ = last & 0xff;                              \
            *outptr++ = (last >> 8) & 0xff;                             \
            }                                                     \
          else                                              \
            {                                                     \
            result = __GCONV_FULL_OUTPUT;                         \
            break;                                                \
            }                                                     \
        }                                                   \
        else                                                      \
        *outptr++ = last & 0xff;                                  \
      *statep = 0;                                                \
      continue;                                             \
      }                                                           \
                                                            \
    if (ch < 0x80)                                                \
      /* Plain ASCII character.  */                               \
      *outptr++ = ch;                                             \
    else if (ch >= 0x0B80 && ch <= 0x0BFF)                              \
      {                                                           \
      /* Tamil character.  */                                     \
      uint8_t t = ucs4_to_tscii[ch - 0x0B80];                           \
                                                            \
      if (t != 0)                                           \
        {                                                   \
          if ((t >= 0xb8 && t <= 0xc9) || (t >= 0x83 && t <= 0x86))           \
            *statep = (uint32_t) t << 3;                          \
          else                                              \
            *outptr++ = t;                                        \
        }                                                   \
      else if (ch >= 0x0BCA && ch <= 0x0BCC)                            \
        {                                                   \
          /* See whether we have room for two bytes.  */                \
          if (__builtin_expect (outptr + 2 <= outend, 1))               \
            {                                                     \
            *outptr++ = (ch == 0x0BCA ? 0xa6 : 0xa7);             \
            *outptr++ = (ch != 0x0BCC ? 0xa1 : 0xaa);             \
            }                                                     \
          else                                              \
            {                                                     \
            result = __GCONV_FULL_OUTPUT;                         \
            break;                                                \
            }                                                     \
        }                                                   \
      else                                                  \
        {                                                   \
          /* Illegal character.  */                               \
          STANDARD_TO_LOOP_ERR_HANDLER (4);                             \
        }                                                   \
      }                                                           \
    else if (ch == 0x00A9)                                        \
      *outptr++ = ch;                                             \
    else if (ch == 0x2018 || ch == 0x2019)                              \
      *outptr++ = ch - 0x1f87;                                          \
    else if (ch == 0x201C || ch == 0x201D)                              \
      *outptr++ = ch - 0x1f89;                                          \
    else                                                    \
      {                                                           \
      UNICODE_TAG_HANDLER (ch, 4);                                \
                                                            \
      /* Illegal character.  */                                   \
      STANDARD_TO_LOOP_ERR_HANDLER (4);                           \
      }                                                           \
                                                            \
    /* Now that we wrote the output increment the input pointer.  */          \
    inptr += 4;                                                   \
  }
#define LOOP_NEED_FLAGS
#define EXTRA_LOOP_DECLS      , int *statep
#include <iconv/loop.c>


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

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