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/* Convert characters in input buffer using conversion descriptor to

   output buffer.

   Copyright (C) 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.

   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 <assert.h>

#include <gconv_int.h>

#include <sys/param.h>

#include <dlfcn.h>

#include <stddef.h>

int

internal_function

__gconv (__gconv_t cd, const unsigned char **inbuf,

         const unsigned char *inbufend, unsigned char **outbuf,

         unsigned char *outbufend, size_t *irreversible)

{

  size_t last_step;

  int result;

  if (cd == (__gconv_t) -1L)

    return __GCONV_ILLEGAL_DESCRIPTOR;

  last_step = cd->__nsteps - 1;

  assert (irreversible != NULL);

  *irreversible = 0;

  cd->__data[last_step].__outbuf = outbuf != NULL ? *outbuf : NULL;

  cd->__data[last_step].__outbufend = outbufend;

  if (inbuf == NULL || *inbuf == NULL)

    /* We just flush.  */

    result = cd->__steps->__fct (cd->__steps, cd->__data, NULL, NULL, NULL,

                                 irreversible,

                                 cd->__data[last_step].__outbuf == NULL ? 2 : 1, 0);

  else

    {

      const unsigned char *last_start;

      assert (outbuf != NULL && *outbuf != NULL);

      do

        {

          last_start = *inbuf;

          result = cd->__steps->__fct (cd->__steps, cd->__data, inbuf, inbufend,

                                 NULL, irreversible, 0, 0);

        }

      while (result == __GCONV_EMPTY_INPUT && last_start != *inbuf

             && *inbuf + cd->__steps->__min_needed_from <= inbufend);

    }

  if (outbuf != NULL && *outbuf != NULL)

    *outbuf = cd->__data[last_step].__outbuf;

  return result;

}