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/*

 * Copyright (c) 2003-2004, Artem B. Bityuckiy

 * Copyright (c) 1999,2000, Konstantin Chuguev. All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 */

/*

FUNCTION

<<iconv>>, <<iconv_open>>, <<iconv_close>>---charset conversion routines

INDEX

        iconv

INDEX

        iconv_open

INDEX

        iconv_close

INDEX

        _iconv_r

INDEX

        _iconv_open_r

INDEX

        _iconv_close_r

ANSI_SYNOPSIS

        #include <iconv.h>

        iconv_t iconv_open (const char *<[to]>, const char *<[from]>);

        int iconv_close (iconv_t <[cd]>);

        size_t iconv (iconv_t <[cd]>, char **<[inbuf]>,

                      size_t *<[inbytesleft]>,

                      char **<[outbuf]>, size_t *<[outbytesleft]>),

        iconv_t _iconv_open_r (struct _reent *<[rptr]>,

                               const char *<[to]>, const char *<[from]>);

        int _iconv_close_r (struct _reent *<[rptr]>, iconv_t <[cd]>);

        size_t _iconv_r (struct _reent *<[rptr]>,

                         iconv_t <[cd]>, const char **<[inbuf]>,

                         size_t *<[inbytesleft]>,

                         char **<[outbuf]>, size_t *<[outbytesleft]>),

TRAD_SYNOPSIS

        #include <iconv.h>

        size_t iconv (<[cd]>, <[in]>, <[inleft]>, <[out]>, <[outleft]>)

        iconv_t <[cd]>;

        char **<[in]>;

        size_t *<[inleft]>;

        char **<[out]>;

        size_t *<[outleft]>);

        #include <iconv.h>

        iconv_t iconv_open (<[to]>, <[from]>);

        const char *<[to]>;

        const char *<[from]>;

        #include <iconv.h>

        int iconv_close (<[cd]>);

        iconv_t <[cd]>;

        #include <iconv.h>

        size_t _iconv_r (<[rptr]>, <[cd]>, <[in]>, <[inleft]>, <[out]>, <[outleft]>)

        struct _reent *<[rptr]>;

        iconv_t <[cd]>;

        const char **<[in]>;

        size_t *<[inleft]>;

        char **<[out]>;

        size_t *<[outleft]>);

        #include <iconv.h>

        iconv_t _iconv_open_r (<[rptr]>, <[to]>, <[from]>);

        struct _reent *<[rptr]>;

        const char *<[to]>;

        const char *<[from]>;

        #include <iconv.h>

        int iconv_close (<[rptr]>, <[cd]>);

        struct _reent *<[rptr]>;

        iconv_t <[cd]>;

DESCRIPTION

The function <<iconv>> converts characters from <[in]> which are in one

encoding to characters of another encoding, outputting them to <[out]>.

The value <[inleft]> specifies the number of input bytes to convert whereas

the value <[outleft]> specifies the size remaining in the <[out]> buffer.

The conversion descriptor <[cd]> specifies the conversion being performed

and is created via <<iconv_open>>.

An <<iconv>> conversion stops if: the input bytes are exhausted, the output

buffer is full, an invalid input character sequence occurs, or the

conversion specifier is invalid.

The function <<iconv_open>> is used to specify a conversion from one

encoding: <[from]> to another: <[to]>.  The result of the call is

to create a conversion specifier that can be used with <<iconv>>.

The function <<iconv_close>> is used to close a conversion specifier after

it is no longer needed.

The <<_iconv_r>>, <<_iconv_open_r>>, and <<_iconv_close_r>> functions are

reentrant versions of <<iconv>>, <<iconv_open>>, and <<iconv_close>>,

respectively.  An additional reentrancy struct pointer: <[rptr]> is passed

to properly set <<errno>>.

RETURNS

The <<iconv>> function returns the number of non-identical conversions

performed.  If an error occurs, (size_t)-1 is returned and <<errno>>

is set appropriately.  The values of <[inleft]>, <[in]>, <[out]>,

and <[outleft]> are modified to indicate how much input was processed

and how much output was created.

The <<iconv_open>> function returns either a valid conversion specifier

or (iconv_t)-1 to indicate failure.  If failure occurs, <<errno>> is set

appropriately.

The <<iconv_close>> function returns 0 on success or -1 on failure.

If failure occurs <<errno>> is set appropriately.

PORTABILITY

<<iconv>>, <<iconv_open>>, and <<iconv_close>> are non-ANSI and are specified

by the Single Unix specification.

No supporting OS subroutine calls are required.

*/

#include <_ansi.h>

#include <reent.h>

#include <sys/types.h>

#include <errno.h>

#include <string.h>

#include <stdlib.h>

#include <iconv.h>

#include <wchar.h>

#include <sys/iconvnls.h>

#include "local.h"

#include "conv.h"

#include "ucsconv.h"

/*

 * iconv interface functions as specified by Single Unix specification.

 */

iconv_t

_DEFUN(iconv_open, (to, from),

                   _CONST char *to _AND

                   _CONST char *from)

{

  return _iconv_open_r (_REENT, to, from);

}

size_t

_DEFUN(iconv, (cd, inbuf, inbytesleft, outbuf, outbytesleft),

              iconv_t cd          _AND

              char **inbuf _AND

              size_t *inbytesleft _AND

              char **outbuf       _AND

              size_t *outbytesleft)

{

    return _iconv_r (_REENT, cd, (_CONST char **) inbuf, inbytesleft,

                     outbuf, outbytesleft);

}

int

_DEFUN(iconv_close, (cd), iconv_t cd)

{

    return _iconv_close_r (_REENT, cd);

}

#ifndef _REENT_ONLY

iconv_t

_DEFUN(_iconv_open_r, (rptr, to, from),

                      struct _reent *rptr _AND

                      _CONST char *to     _AND

                      _CONST char *from)

{

  iconv_conversion_t *ic;

  if (to == NULL || from == NULL || *to == '\0' || *from == '\0')

    return (iconv_t)-1;

  if ((to = (_CONST char *)_iconv_resolve_encoding_name (rptr, to)) == NULL)

    return (iconv_t)-1;

  if ((from = (_CONST char *)_iconv_resolve_encoding_name (rptr, from)) == NULL)

    {

      _free_r (rptr, (_VOID_PTR)to);

      return (iconv_t)-1;

    }

  ic = (iconv_conversion_t *)_malloc_r (rptr, sizeof (iconv_conversion_t));

  if (ic == NULL)

    return (iconv_t)-1;

  /* Select which conversion type to use */

  if (strcmp (from, to) == 0)

    {

      /* Use null conversion */

      ic->handlers = &_iconv_null_conversion_handlers;

      ic->data = ic->handlers->open (rptr, to, from);

    }

  else

    {

      /* Use UCS-based conversion */

      ic->handlers = &_iconv_ucs_conversion_handlers;

      ic->data = ic->handlers->open (rptr, to, from);

    }

  _free_r (rptr, (_VOID_PTR)to);

  _free_r (rptr, (_VOID_PTR)from);

  if (ic->data == NULL)

    {

      _free_r (rptr, (_VOID_PTR)ic);

      return (iconv_t)-1;

    }

  return (_VOID_PTR)ic;

}

size_t

_DEFUN(_iconv_r, (rptr, cd, inbuf, inbytesleft, outbuf, outbytesleft),

                 struct _reent *rptr _AND

                 iconv_t cd          _AND

                 _CONST char **inbuf _AND

                 size_t *inbytesleft _AND

                 char **outbuf       _AND

                 size_t *outbytesleft)

{

  iconv_conversion_t *ic = (iconv_conversion_t *)cd;

  if ((_VOID_PTR)cd == NULL || cd == (iconv_t)-1 || ic->data == NULL

       || (ic->handlers != &_iconv_null_conversion_handlers

           && ic->handlers != &_iconv_ucs_conversion_handlers))

    {

      __errno_r (rptr) = EBADF;

      return (size_t)-1;

    }

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

    {

      mbstate_t state_null = ICONV_ZERO_MB_STATE_T;

      if (!ic->handlers->is_stateful(ic->data, 1))

        return (size_t)0;

      if (outbuf == NULL || *outbuf == NULL)

        {

          /* Reset shift state */

          ic->handlers->set_state (ic->data, &state_null, 1);

          return (size_t)0;

        }

      if (outbytesleft != NULL)

        {

          mbstate_t state_save = ICONV_ZERO_MB_STATE_T;

          /* Save current shift state */

          ic->handlers->get_state (ic->data, &state_save, 1);

          /* Reset shift state */

          ic->handlers->set_state (ic->data, &state_null, 1);

          /* Get initial shift state sequence and it's length */

          ic->handlers->get_state (ic->data, &state_null, 1);

          if (*outbytesleft >= state_null.__count)

            {

              memcpy ((_VOID_PTR)(*outbuf), (_VOID_PTR)&state_null, state_null.__count);

              *outbuf += state_null.__count;

              *outbytesleft -= state_null.__count;

              return (size_t)0;

            }

           /* Restore shift state if output buffer is too small */

           ic->handlers->set_state (ic->data, &state_save, 1);

        }

      __errno_r (rptr) = E2BIG;

      return (size_t)-1;

    }

  if (*inbytesleft == 0)

    {

      __errno_r (rptr) = EINVAL;

      return (size_t)-1;

    }

  if (*outbytesleft == 0 || *outbuf == NULL)

    {

      __errno_r (rptr) = E2BIG;

      return (size_t)-1;

    }

  return ic->handlers->convert (rptr,

                                ic->data,

                                (_CONST unsigned char**)inbuf,

                                inbytesleft,

                                (unsigned char**)outbuf,

                                outbytesleft,

                                0);

}

int

_DEFUN(_iconv_close_r, (rptr, cd),

                       struct _reent *rptr _AND

                       iconv_t cd)

{

  int res;

  iconv_conversion_t *ic = (iconv_conversion_t *)cd;

  if ((_VOID_PTR)cd == NULL || cd == (iconv_t)-1 || ic->data == NULL

       || (ic->handlers != &_iconv_null_conversion_handlers

           && ic->handlers != &_iconv_ucs_conversion_handlers))

    {

      __errno_r (rptr) = EBADF;

      return -1;

    }

  res = (int)ic->handlers->close (rptr, ic->data);

  _free_r (rptr, (_VOID_PTR)cd);

  return res;

}

#endif /* !_REENT_ONLY */