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skeleton.c

/* Skeleton for a conversion module.
   Copyright (C) 1998-2002, 2005 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.

   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.  */

/* This file can be included to provide definitions of several things
   many modules have in common.  It can be customized using the following
   macros:

     DEFINE_INIT  define the default initializer.  This requires the
                  following symbol to be defined.

     CHARSET_NAME string with official name of the coded character
                  set (in all-caps)

     DEFINE_FINI  define the default destructor function.

     MIN_NEEDED_FROM    minimal number of bytes needed for the from-charset.
     MIN_NEEDED_TO      likewise for the to-charset.

     MAX_NEEDED_FROM    maximal number of bytes needed for the from-charset.
                  This macro is optional, it defaults to MIN_NEEDED_FROM.
     MAX_NEEDED_TO      likewise for the to-charset.

     FROM_LOOP_MIN_NEEDED_FROM
     FROM_LOOP_MAX_NEEDED_FROM
                        minimal/maximal number of bytes needed on input
                        of one round through the FROM_LOOP.  Defaults
                        to MIN_NEEDED_FROM and MAX_NEEDED_FROM, respectively.
     FROM_LOOP_MIN_NEEDED_TO
     FROM_LOOP_MAX_NEEDED_TO
                        minimal/maximal number of bytes needed on output
                        of one round through the FROM_LOOP.  Defaults
                        to MIN_NEEDED_TO and MAX_NEEDED_TO, respectively.
     TO_LOOP_MIN_NEEDED_FROM
     TO_LOOP_MAX_NEEDED_FROM
                        minimal/maximal number of bytes needed on input
                        of one round through the TO_LOOP.  Defaults
                        to MIN_NEEDED_TO and MAX_NEEDED_TO, respectively.
     TO_LOOP_MIN_NEEDED_TO
     TO_LOOP_MAX_NEEDED_TO
                        minimal/maximal number of bytes needed on output
                        of one round through the TO_LOOP.  Defaults
                        to MIN_NEEDED_FROM and MAX_NEEDED_FROM, respectively.

     FROM_DIRECTION     this macro is supposed to return a value != 0
                  if we convert from the current character set,
                  otherwise it return 0.

     EMIT_SHIFT_TO_INIT this symbol is optional.  If it is defined it
                  defines some code which writes out a sequence
                  of bytes which bring the current state into
                  the initial state.

     FROM_LOOP          name of the function implementing the conversion
                  from the current character set.
     TO_LOOP            likewise for the other direction

     ONE_DIRECTION      optional.  If defined to 1, only one conversion
                  direction is defined instead of two.  In this
                  case, FROM_DIRECTION should be defined to 1, and
                  FROM_LOOP and TO_LOOP should have the same value.

     SAVE_RESET_STATE   in case of an error we must reset the state for
                  the rerun so this macro must be defined for
                  stateful encodings.  It takes an argument which
                  is nonzero when saving.

     RESET_INPUT_BUFFER If the input character sets allow this the macro
                  can be defined to reset the input buffer pointers
                  to cover only those characters up to the error.

     FUNCTION_NAME      if not set the conversion function is named `gconv'.

     PREPARE_LOOP optional code preparing the conversion loop.  Can
                  contain variable definitions.
     END_LOOP           also optional, may be used to store information

     EXTRA_LOOP_ARGS    optional macro specifying extra arguments passed
                  to loop function.

     STORE_REST         optional, needed only when MAX_NEEDED_FROM > 4.
                  This macro stores the seen but unconverted input bytes
                  in the state.

     FROM_ONEBYTE optional.  If defined, should be the name of a
                  specialized conversion function for a single byte
                  from the current character set to INTERNAL.  This
                  function has prototype
                     wint_t
                     FROM_ONEBYTE (struct __gconv_step *, unsigned char);
                  and does a special conversion:
                  - The input is a single byte.
                  - The output is a single uint32_t.
                  - The state before the conversion is the initial state;
                    the state after the conversion is irrelevant.
                  - No transliteration.
                  - __invocation_counter = 0.
                  - __internal_use = 1.
                  - do_flush = 0.

   Modules can use mbstate_t to store conversion state as follows:

   * Bits 2..0 of '__count' contain the number of lookahead input bytes
     stored in __value.__wchb.  Always zero if the converter never
     returns __GCONV_INCOMPLETE_INPUT.

   * Bits 31..3 of '__count' are module dependent shift state.

   * __value: When STORE_REST/UNPACK_BYTES aren't defined and when the
     converter has returned __GCONV_INCOMPLETE_INPUT, this contains
     at most 4 lookahead bytes. Converters with an mb_cur_max > 4
     (currently only UTF-8) must find a way to store their state
     in __value.__wch and define STORE_REST/UNPACK_BYTES appropriately.

   When __value contains lookahead, __count must not be zero, because
   the converter is not in the initial state then, and mbsinit() --
   defined as a (__count == 0) test -- must reflect this.
 */

#include <assert.h>
#include <gconv.h>
#include <string.h>
#define __need_size_t
#define __need_NULL
#include <stddef.h>

#ifndef STATIC_GCONV
# include <dlfcn.h>
#endif

#include <sysdep.h>

#ifndef DL_CALL_FCT
# define DL_CALL_FCT(fct, args) fct args
#endif

/* The direction objects.  */
#if DEFINE_INIT
# ifndef FROM_DIRECTION
#  define FROM_DIRECTION_VAL NULL
#  define TO_DIRECTION_VAL ((void *) ~((uintptr_t) 0))
#  define FROM_DIRECTION (step->__data == FROM_DIRECTION_VAL)
# endif
#else
# ifndef FROM_DIRECTION
#  error "FROM_DIRECTION must be provided if non-default init is used"
# endif
#endif


/* How many bytes are needed at most for the from-charset.  */
#ifndef MAX_NEEDED_FROM
# define MAX_NEEDED_FROM      MIN_NEEDED_FROM
#endif

/* Same for the to-charset.  */
#ifndef MAX_NEEDED_TO
# define MAX_NEEDED_TO        MIN_NEEDED_TO
#endif

/* Defaults for the per-direction min/max constants.  */
#ifndef FROM_LOOP_MIN_NEEDED_FROM
# define FROM_LOOP_MIN_NEEDED_FROM  MIN_NEEDED_FROM
#endif
#ifndef FROM_LOOP_MAX_NEEDED_FROM
# define FROM_LOOP_MAX_NEEDED_FROM  MAX_NEEDED_FROM
#endif
#ifndef FROM_LOOP_MIN_NEEDED_TO
# define FROM_LOOP_MIN_NEEDED_TO    MIN_NEEDED_TO
#endif
#ifndef FROM_LOOP_MAX_NEEDED_TO
# define FROM_LOOP_MAX_NEEDED_TO    MAX_NEEDED_TO
#endif
#ifndef TO_LOOP_MIN_NEEDED_FROM
# define TO_LOOP_MIN_NEEDED_FROM    MIN_NEEDED_TO
#endif
#ifndef TO_LOOP_MAX_NEEDED_FROM
# define TO_LOOP_MAX_NEEDED_FROM    MAX_NEEDED_TO
#endif
#ifndef TO_LOOP_MIN_NEEDED_TO
# define TO_LOOP_MIN_NEEDED_TO            MIN_NEEDED_FROM
#endif
#ifndef TO_LOOP_MAX_NEEDED_TO
# define TO_LOOP_MAX_NEEDED_TO            MAX_NEEDED_FROM
#endif


/* Define macros which can access unaligned buffers.  These macros are
   supposed to be used only in code outside the inner loops.  For the inner
   loops we have other definitions which allow optimized access.  */
#ifdef _STRING_ARCH_unaligned
/* We can handle unaligned memory access.  */
# define get16u(addr) *((__const uint16_t *) (addr))
# define get32u(addr) *((__const uint32_t *) (addr))

/* We need no special support for writing values either.  */
# define put16u(addr, val) *((uint16_t *) (addr)) = (val)
# define put32u(addr, val) *((uint32_t *) (addr)) = (val)
#else
/* Distinguish between big endian and little endian.  */
# if __BYTE_ORDER == __LITTLE_ENDIAN
#  define get16u(addr) \
     (((__const unsigned char *) (addr))[1] << 8                        \
      | ((__const unsigned char *) (addr))[0])
#  define get32u(addr) \
     (((((__const unsigned char *) (addr))[3] << 8                      \
      | ((__const unsigned char *) (addr))[2]) << 8                     \
       | ((__const unsigned char *) (addr))[1]) << 8                    \
      | ((__const unsigned char *) (addr))[0])

#  define put16u(addr, val) \
     ({ uint16_t __val = (val);                                         \
      ((unsigned char *) (addr))[0] = __val;                            \
      ((unsigned char *) (addr))[1] = __val >> 8;                       \
      (void) 0; })
#  define put32u(addr, val) \
     ({ uint32_t __val = (val);                                         \
      ((unsigned char *) (addr))[0] = __val;                            \
      __val >>= 8;                                                \
      ((unsigned char *) (addr))[1] = __val;                            \
      __val >>= 8;                                                \
      ((unsigned char *) (addr))[2] = __val;                            \
      __val >>= 8;                                                \
      ((unsigned char *) (addr))[3] = __val;                            \
      (void) 0; })
# else
#  define get16u(addr) \
     (((__const unsigned char *) (addr))[0] << 8                        \
      | ((__const unsigned char *) (addr))[1])
#  define get32u(addr) \
     (((((__const unsigned char *) (addr))[0] << 8                      \
      | ((__const unsigned char *) (addr))[1]) << 8                     \
       | ((__const unsigned char *) (addr))[2]) << 8                    \
      | ((__const unsigned char *) (addr))[3])

#  define put16u(addr, val) \
     ({ uint16_t __val = (val);                                         \
      ((unsigned char *) (addr))[1] = __val;                            \
      ((unsigned char *) (addr))[0] = __val >> 8;                       \
      (void) 0; })
#  define put32u(addr, val) \
     ({ uint32_t __val = (val);                                         \
      ((unsigned char *) (addr))[3] = __val;                            \
      __val >>= 8;                                                \
      ((unsigned char *) (addr))[2] = __val;                            \
      __val >>= 8;                                                \
      ((unsigned char *) (addr))[1] = __val;                            \
      __val >>= 8;                                                \
      ((unsigned char *) (addr))[0] = __val;                            \
      (void) 0; })
# endif
#endif


/* For conversions from a fixed width character set to another fixed width
   character set we can define RESET_INPUT_BUFFER in a very fast way.  */
#if !defined RESET_INPUT_BUFFER && !defined SAVE_RESET_STATE
# if FROM_LOOP_MIN_NEEDED_FROM == FROM_LOOP_MAX_NEEDED_FROM \
     && FROM_LOOP_MIN_NEEDED_TO == FROM_LOOP_MAX_NEEDED_TO \
     && TO_LOOP_MIN_NEEDED_FROM == TO_LOOP_MAX_NEEDED_FROM \
     && TO_LOOP_MIN_NEEDED_TO == TO_LOOP_MAX_NEEDED_TO
/* We have to use these `if's here since the compiler cannot know that
   (outbuf - outerr) is always divisible by FROM/TO_LOOP_MIN_NEEDED_TO.
   The ?:1 avoids division by zero warnings that gcc 3.2 emits even for
   obviously unreachable code.  */
#  define RESET_INPUT_BUFFER \
  if (FROM_DIRECTION)                                             \
    {                                                       \
      if (FROM_LOOP_MIN_NEEDED_FROM % FROM_LOOP_MIN_NEEDED_TO == 0)           \
      *inptrp -= (outbuf - outerr)                                \
               * (FROM_LOOP_MIN_NEEDED_FROM / FROM_LOOP_MIN_NEEDED_TO);   \
      else if (FROM_LOOP_MIN_NEEDED_TO % FROM_LOOP_MIN_NEEDED_FROM == 0)      \
      *inptrp -= (outbuf - outerr)                                \
               / (FROM_LOOP_MIN_NEEDED_TO / FROM_LOOP_MIN_NEEDED_FROM     \
                  ? : 1);                                         \
      else                                                  \
      *inptrp -= ((outbuf - outerr) / FROM_LOOP_MIN_NEEDED_TO)          \
               * FROM_LOOP_MIN_NEEDED_FROM;                             \
    }                                                       \
  else                                                            \
    {                                                       \
      if (TO_LOOP_MIN_NEEDED_FROM % TO_LOOP_MIN_NEEDED_TO == 0)               \
      *inptrp -= (outbuf - outerr)                                \
               * (TO_LOOP_MIN_NEEDED_FROM / TO_LOOP_MIN_NEEDED_TO);           \
      else if (TO_LOOP_MIN_NEEDED_TO % TO_LOOP_MIN_NEEDED_FROM == 0)          \
      *inptrp -= (outbuf - outerr)                                \
               / (TO_LOOP_MIN_NEEDED_TO / TO_LOOP_MIN_NEEDED_FROM ? : 1); \
      else                                                  \
      *inptrp -= ((outbuf - outerr) / TO_LOOP_MIN_NEEDED_TO)                  \
               * TO_LOOP_MIN_NEEDED_FROM;                         \
    }
# endif
#endif


/* The default init function.  It simply matches the name and initializes
   the step data to point to one of the objects above.  */
#if DEFINE_INIT
# ifndef CHARSET_NAME
#  error "CHARSET_NAME not defined"
# endif

extern int gconv_init (struct __gconv_step *step);
int
gconv_init (struct __gconv_step *step)
{
  /* Determine which direction.  */
  if (strcmp (step->__from_name, CHARSET_NAME) == 0)
    {
      step->__data = FROM_DIRECTION_VAL;

      step->__min_needed_from = FROM_LOOP_MIN_NEEDED_FROM;
      step->__max_needed_from = FROM_LOOP_MAX_NEEDED_FROM;
      step->__min_needed_to = FROM_LOOP_MIN_NEEDED_TO;
      step->__max_needed_to = FROM_LOOP_MAX_NEEDED_TO;

#ifdef FROM_ONEBYTE
      step->__btowc_fct = FROM_ONEBYTE;
#endif
    }
  else if (__builtin_expect (strcmp (step->__to_name, CHARSET_NAME), 0) == 0)
    {
      step->__data = TO_DIRECTION_VAL;

      step->__min_needed_from = TO_LOOP_MIN_NEEDED_FROM;
      step->__max_needed_from = TO_LOOP_MAX_NEEDED_FROM;
      step->__min_needed_to = TO_LOOP_MIN_NEEDED_TO;
      step->__max_needed_to = TO_LOOP_MAX_NEEDED_TO;
    }
  else
    return __GCONV_NOCONV;

#ifdef SAVE_RESET_STATE
  step->__stateful = 1;
#else
  step->__stateful = 0;
#endif

  return __GCONV_OK;
}
#endif


/* The default destructor function does nothing in the moment and so
   we don't define it at all.  But we still provide the macro just in
   case we need it some day.  */
#if DEFINE_FINI
#endif


/* If no arguments have to passed to the loop function define the macro
   as empty.  */
#ifndef EXTRA_LOOP_ARGS
# define EXTRA_LOOP_ARGS
#endif


/* This is the actual conversion function.  */
#ifndef FUNCTION_NAME
# define FUNCTION_NAME  gconv
#endif

/* The macros are used to access the function to convert single characters.  */
#define SINGLE(fct) SINGLE2 (fct)
#define SINGLE2(fct) fct##_single


extern int FUNCTION_NAME (struct __gconv_step *step,
                    struct __gconv_step_data *data,
                    const unsigned char **inptrp,
                    const unsigned char *inend,
                    unsigned char **outbufstart, size_t *irreversible,
                    int do_flush, int consume_incomplete);
int
FUNCTION_NAME (struct __gconv_step *step, struct __gconv_step_data *data,
             const unsigned char **inptrp, const unsigned char *inend,
             unsigned char **outbufstart, size_t *irreversible, int do_flush,
             int consume_incomplete)
{
  struct __gconv_step *next_step = step + 1;
  struct __gconv_step_data *next_data = data + 1;
  __gconv_fct fct = NULL;
  int status;

  if ((data->__flags & __GCONV_IS_LAST) == 0)
    {
      fct = next_step->__fct;
#ifdef PTR_DEMANGLE
      if (next_step->__shlib_handle != NULL)
      PTR_DEMANGLE (fct);
#endif
    }

  /* If the function is called with no input this means we have to reset
     to the initial state.  The possibly partly converted input is
     dropped.  */
  if (__builtin_expect (do_flush, 0))
    {
      /* This should never happen during error handling.  */
      assert (outbufstart == NULL);

      status = __GCONV_OK;

#ifdef EMIT_SHIFT_TO_INIT
      if (do_flush == 1)
      {
        /* We preserve the initial values of the pointer variables.  */
        unsigned char *outbuf = data->__outbuf;
        unsigned char *outstart = outbuf;
        unsigned char *outend = data->__outbufend;

# ifdef PREPARE_LOOP
        PREPARE_LOOP
# endif

# ifdef SAVE_RESET_STATE
        SAVE_RESET_STATE (1);
# endif

        /* Emit the escape sequence to reset the state.  */
        EMIT_SHIFT_TO_INIT;

        /* Call the steps down the chain if there are any but only if we
           successfully emitted the escape sequence.  This should only
           fail if the output buffer is full.  If the input is invalid
           it should be discarded since the user wants to start from a
           clean state.  */
        if (status == __GCONV_OK)
          {
            if (data->__flags & __GCONV_IS_LAST)
            /* Store information about how many bytes are available.  */
            data->__outbuf = outbuf;
            else
            {
              /* Write out all output which was produced.  */
              if (outbuf > outstart)
                {
                  const unsigned char *outerr = outstart;
                  int result;

                  result = DL_CALL_FCT (fct, (next_step, next_data,
                                      &outerr, outbuf, NULL,
                                      irreversible, 0,
                                      consume_incomplete));

                  if (result != __GCONV_EMPTY_INPUT)
                  {
                    if (__builtin_expect (outerr != outbuf, 0))
                      {
                        /* We have a problem.  Undo the conversion.  */
                        outbuf = outstart;

                        /* Restore the state.  */
# ifdef SAVE_RESET_STATE
                        SAVE_RESET_STATE (0);
# endif
                      }

                    /* Change the status.  */
                    status = result;
                  }
                }

              if (status == __GCONV_OK)
                /* Now flush the remaining steps.  */
                status = DL_CALL_FCT (fct, (next_step, next_data, NULL,
                                    NULL, NULL, irreversible, 1,
                                    consume_incomplete));
            }
          }
      }
      else
#endif
      {
        /* Clear the state object.  There might be bytes in there from
           previous calls with CONSUME_INCOMPLETE == 1.  But don't emit
           escape sequences.  */
        memset (data->__statep, '\0', sizeof (*data->__statep));

        if (! (data->__flags & __GCONV_IS_LAST))
          /* Now flush the remaining steps.  */
          status = DL_CALL_FCT (fct, (next_step, next_data, NULL, NULL,
                              NULL, irreversible, do_flush,
                              consume_incomplete));
      }
    }
  else
    {
      /* We preserve the initial values of the pointer variables.  */
      const unsigned char *inptr = *inptrp;
      unsigned char *outbuf = (__builtin_expect (outbufstart == NULL, 1)
                         ? data->__outbuf : *outbufstart);
      unsigned char *outend = data->__outbufend;
      unsigned char *outstart;
      /* This variable is used to count the number of characters we
       actually converted.  */
      size_t lirreversible = 0;
      size_t *lirreversiblep = irreversible ? &lirreversible : NULL;

      /* The following assumes that encodings, which have a variable length
       what might unalign a buffer even though it is a aligned in the
       beginning, either don't have the minimal number of bytes as a divisor
       of the maximum length or have a minimum length of 1.  This is true
       for all known and supported encodings.
       We use && instead of || to combine the subexpression for the FROM
       encoding and for the TO encoding, because usually one of them is
       INTERNAL, for which the subexpression evaluates to 1, but INTERNAL
       buffers are always aligned correctly.  */
#define POSSIBLY_UNALIGNED \
  (!defined _STRING_ARCH_unaligned                                \
   && (((FROM_LOOP_MIN_NEEDED_FROM != 1                                 \
       && FROM_LOOP_MAX_NEEDED_FROM % FROM_LOOP_MIN_NEEDED_FROM == 0)         \
      && (FROM_LOOP_MIN_NEEDED_TO != 1                            \
          && FROM_LOOP_MAX_NEEDED_TO % FROM_LOOP_MIN_NEEDED_TO == 0))         \
       || ((TO_LOOP_MIN_NEEDED_FROM != 1                          \
          && TO_LOOP_MAX_NEEDED_FROM % TO_LOOP_MIN_NEEDED_FROM == 0)          \
         && (TO_LOOP_MIN_NEEDED_TO != 1                           \
             && TO_LOOP_MAX_NEEDED_TO % TO_LOOP_MIN_NEEDED_TO == 0))))
#if POSSIBLY_UNALIGNED
      int unaligned;
# define GEN_unaligned(name) GEN_unaligned2 (name)
# define GEN_unaligned2(name) name##_unaligned
#else
# define unaligned 0
#endif

#ifdef PREPARE_LOOP
      PREPARE_LOOP
#endif

#if FROM_LOOP_MAX_NEEDED_FROM > 1 || TO_LOOP_MAX_NEEDED_FROM > 1
      /* If the function is used to implement the mb*towc*() or wc*tomb*()
       functions we must test whether any bytes from the last call are
       stored in the `state' object.  */
      if (((FROM_LOOP_MAX_NEEDED_FROM > 1 && TO_LOOP_MAX_NEEDED_FROM > 1)
         || (FROM_LOOP_MAX_NEEDED_FROM > 1 && FROM_DIRECTION)
         || (TO_LOOP_MAX_NEEDED_FROM > 1 && !FROM_DIRECTION))
        && consume_incomplete && (data->__statep->__count & 7) != 0)
      {
        /* Yep, we have some bytes left over.  Process them now.
             But this must not happen while we are called from an
             error handler.  */
        assert (outbufstart == NULL);

# if FROM_LOOP_MAX_NEEDED_FROM > 1
        if (TO_LOOP_MAX_NEEDED_FROM == 1 || FROM_DIRECTION)
          status = SINGLE(FROM_LOOP) (step, data, inptrp, inend, &outbuf,
                              outend, lirreversiblep
                              EXTRA_LOOP_ARGS);
# endif
# if !ONE_DIRECTION
#  if FROM_LOOP_MAX_NEEDED_FROM > 1 && TO_LOOP_MAX_NEEDED_FROM > 1
        else
#  endif
#  if TO_LOOP_MAX_NEEDED_FROM > 1
          status = SINGLE(TO_LOOP) (step, data, inptrp, inend, &outbuf,
                              outend, lirreversiblep EXTRA_LOOP_ARGS);
#  endif
# endif

        if (__builtin_expect (status, __GCONV_OK) != __GCONV_OK)
          return status;
      }
#endif

#if POSSIBLY_UNALIGNED
      unaligned =
      ((FROM_DIRECTION
        && ((uintptr_t) inptr % FROM_LOOP_MIN_NEEDED_FROM != 0
            || ((data->__flags & __GCONV_IS_LAST)
              && (uintptr_t) outbuf % FROM_LOOP_MIN_NEEDED_TO != 0)))
       || (!FROM_DIRECTION
           && (((data->__flags & __GCONV_IS_LAST)
              && (uintptr_t) outbuf % TO_LOOP_MIN_NEEDED_TO != 0)
             || (uintptr_t) inptr % TO_LOOP_MIN_NEEDED_FROM != 0)));
#endif

      while (1)
      {
        struct __gconv_trans_data *trans;

        /* Remember the start value for this round.  */
        inptr = *inptrp;
        /* The outbuf buffer is empty.  */
        outstart = outbuf;

#ifdef SAVE_RESET_STATE
        SAVE_RESET_STATE (1);
#endif

        if (__builtin_expect (!unaligned, 1))
          {
            if (FROM_DIRECTION)
            /* Run the conversion loop.  */
            status = FROM_LOOP (step, data, inptrp, inend, &outbuf, outend,
                            lirreversiblep EXTRA_LOOP_ARGS);
            else
            /* Run the conversion loop.  */
            status = TO_LOOP (step, data, inptrp, inend, &outbuf, outend,
                          lirreversiblep EXTRA_LOOP_ARGS);
          }
#if POSSIBLY_UNALIGNED
        else
          {
            if (FROM_DIRECTION)
            /* Run the conversion loop.  */
            status = GEN_unaligned (FROM_LOOP) (step, data, inptrp, inend,
                                        &outbuf, outend,
                                        lirreversiblep
                                        EXTRA_LOOP_ARGS);
            else
            /* Run the conversion loop.  */
            status = GEN_unaligned (TO_LOOP) (step, data, inptrp, inend,
                                      &outbuf, outend,
                                      lirreversiblep
                                      EXTRA_LOOP_ARGS);
          }
#endif

        /* If we were called as part of an error handling module we
           don't do anything else here.  */
        if (__builtin_expect (outbufstart != NULL, 0))
          {
            *outbufstart = outbuf;
            return status;
          }

        /* Give the transliteration module the chance to store the
           original text and the result in case it needs a context.  */
        for (trans = data->__trans; trans != NULL; trans = trans->__next)
          if (trans->__trans_context_fct != NULL)
            DL_CALL_FCT (trans->__trans_context_fct,
                     (trans->__data, inptr, *inptrp, outstart, outbuf));

        /* We finished one use of the loops.  */
        ++data->__invocation_counter;

        /* If this is the last step leave the loop, there is nothing
             we can do.  */
        if (__builtin_expect (data->__flags & __GCONV_IS_LAST, 0))
          {
            /* Store information about how many bytes are available.  */
            data->__outbuf = outbuf;

            /* Remember how many non-identical characters we
                 converted in a irreversible way.  */
            *irreversible += lirreversible;

            break;
          }

        /* Write out all output which was produced.  */
        if (__builtin_expect (outbuf > outstart, 1))
          {
            const unsigned char *outerr = data->__outbuf;
            int result;

            result = DL_CALL_FCT (fct, (next_step, next_data, &outerr,
                                outbuf, NULL, irreversible, 0,
                                consume_incomplete));

            if (result != __GCONV_EMPTY_INPUT)
            {
              if (__builtin_expect (outerr != outbuf, 0))
                {
#ifdef RESET_INPUT_BUFFER
                  RESET_INPUT_BUFFER;
#else
                  /* We have a problem in one of the functions below.
                   Undo the conversion upto the error point.  */
                  size_t nstatus;

                  /* Reload the pointers.  */
                  *inptrp = inptr;
                  outbuf = outstart;

                  /* Restore the state.  */
# ifdef SAVE_RESET_STATE
                  SAVE_RESET_STATE (0);
# endif

                  if (__builtin_expect (!unaligned, 1))
                  {
                    if (FROM_DIRECTION)
                      /* Run the conversion loop.  */
                      nstatus = FROM_LOOP (step, data, inptrp, inend,
                                     &outbuf, outerr,
                                     lirreversiblep
                                     EXTRA_LOOP_ARGS);
                    else
                      /* Run the conversion loop.  */
                      nstatus = TO_LOOP (step, data, inptrp, inend,
                                     &outbuf, outerr,
                                     lirreversiblep
                                     EXTRA_LOOP_ARGS);
                  }
# if POSSIBLY_UNALIGNED
                  else
                  {
                    if (FROM_DIRECTION)
                      /* Run the conversion loop.  */
                      nstatus = GEN_unaligned (FROM_LOOP) (step, data,
                                                 inptrp, inend,
                                                 &outbuf,
                                                 outerr,
                                                 lirreversiblep
                                                 EXTRA_LOOP_ARGS);
                    else
                      /* Run the conversion loop.  */
                      nstatus = GEN_unaligned (TO_LOOP) (step, data,
                                                 inptrp, inend,
                                                 &outbuf, outerr,
                                                 lirreversiblep
                                                 EXTRA_LOOP_ARGS);
                  }
# endif

                  /* We must run out of output buffer space in this
                   rerun.  */
                  assert (outbuf == outerr);
                  assert (nstatus == __GCONV_FULL_OUTPUT);

                  /* If we haven't consumed a single byte decrement
                   the invocation counter.  */
                  if (__builtin_expect (outbuf == outstart, 0))
                  --data->__invocation_counter;
#endif      /* reset input buffer */
                }

              /* Change the status.  */
              status = result;
            }
            else
            /* All the output is consumed, we can make another run
               if everything was ok.  */
            if (status == __GCONV_FULL_OUTPUT)
              {
                status = __GCONV_OK;
                outbuf = data->__outbuf;
              }
          }

        if (status != __GCONV_OK)
          break;

        /* Reset the output buffer pointer for the next round.  */
        outbuf = data->__outbuf;
      }

#ifdef END_LOOP
      END_LOOP
#endif

      /* If we are supposed to consume all character store now all of the
       remaining characters in the `state' object.  */
#if FROM_LOOP_MAX_NEEDED_FROM > 1 || TO_LOOP_MAX_NEEDED_FROM > 1
      if (((FROM_LOOP_MAX_NEEDED_FROM > 1 && TO_LOOP_MAX_NEEDED_FROM > 1)
         || (FROM_LOOP_MAX_NEEDED_FROM > 1 && FROM_DIRECTION)
         || (TO_LOOP_MAX_NEEDED_FROM > 1 && !FROM_DIRECTION))
        && __builtin_expect (consume_incomplete, 0)
        && status == __GCONV_INCOMPLETE_INPUT)
      {
# ifdef STORE_REST
        mbstate_t *state = data->__statep;

        STORE_REST
# else
        /* Make sure the remaining bytes fit into the state objects
             buffer.  */
        assert (inend - *inptrp < 4);

        size_t cnt;
        for (cnt = 0; *inptrp < inend; ++cnt)
          data->__statep->__value.__wchb[cnt] = *(*inptrp)++;
        data->__statep->__count &= ~7;
        data->__statep->__count |= cnt;
# endif
      }
#endif
#undef unaligned
#undef POSSIBLY_UNALIGNED
    }

  return status;
}

#undef DEFINE_INIT
#undef CHARSET_NAME
#undef DEFINE_FINI
#undef MIN_NEEDED_FROM
#undef MIN_NEEDED_TO
#undef MAX_NEEDED_FROM
#undef MAX_NEEDED_TO
#undef FROM_LOOP_MIN_NEEDED_FROM
#undef FROM_LOOP_MAX_NEEDED_FROM
#undef FROM_LOOP_MIN_NEEDED_TO
#undef FROM_LOOP_MAX_NEEDED_TO
#undef TO_LOOP_MIN_NEEDED_FROM
#undef TO_LOOP_MAX_NEEDED_FROM
#undef TO_LOOP_MIN_NEEDED_TO
#undef TO_LOOP_MAX_NEEDED_TO
#undef FROM_DIRECTION
#undef EMIT_SHIFT_TO_INIT
#undef FROM_LOOP
#undef TO_LOOP
#undef ONE_DIRECTION
#undef SAVE_RESET_STATE
#undef RESET_INPUT_BUFFER
#undef FUNCTION_NAME
#undef PREPARE_LOOP
#undef END_LOOP
#undef EXTRA_LOOP_ARGS
#undef STORE_REST
#undef FROM_ONEBYTE

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