/* Conversion from UTF-8 to legacy encodings.

   Copyright (C) 2002, 2006-2007, 2009-2022 Free Software Foundation, Inc.

   This file is free software.

   It is dual-licensed under "the GNU LGPLv3+ or the GNU GPLv2+".

   You can redistribute it and/or modify it under either

     - the terms of the GNU Lesser General Public License as published

       by the Free Software Foundation; either version 3, or (at your

       option) any later version, or

     - the terms of the GNU General Public License as published by the

       Free Software Foundation; either version 2, or (at your option)

       any later version, or

     - the same dual license "the GNU LGPLv3+ or the GNU GPLv2+".

   This file 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 and the GNU General Public License

   for more details.

   You should have received a copy of the GNU Lesser General Public

   License and of the GNU General Public License along with this

   program.  If not, see <https://www.gnu.org/licenses/>.  */

/* Written by Bruno Haible <bruno@clisp.org>.  */

#include <config.h>

/* Specification.  */

#include "uniconv.h"

#include <errno.h>

#include <stdlib.h>

#include <string.h>

#include "c-strcaseeq.h"

#include "striconveha.h"

#include "unistr.h"

char *

u8_strconv_to_encoding (const uint8_t *string,

                        const char *tocode,

                        enum iconv_ilseq_handler handler)

{

  char *result;

  size_t length;

  if (STRCASEEQ (tocode, "UTF-8", 'U','T','F','-','8',0,0,0,0))

    {

      /* Conversion from UTF-8 to UTF-8.  No need to go through iconv().  */

      length = u8_strlen (string) + 1;

      if (u8_check (string, length))

        {

          errno = EILSEQ;

          return NULL;

        }

      result = (char *) malloc (length);

      if (result == NULL)

        {

          errno = ENOMEM;

          return NULL;

        }

      memcpy (result, (const char *) string, length);

      return result;

    }

  else

    {

      result = NULL;

      length = 0;

      if (mem_iconveha ((const char *) string, u8_strlen (string) + 1,

                        "UTF-8", tocode,

                        handler == iconveh_question_mark, handler,

                        NULL, &result, &length) < 0)

        return NULL;

      /* Verify the result has exactly one NUL byte, at the end.  */

      if (!(length > 0 && result[length-1] == '\0'

            && strlen (result) == length-1))

        {

          free (result);

          errno = EILSEQ;

          return NULL;

        }

      return result;

    }

}