/* Convert unibyte character to wide character.

   Copyright (C) 2008, 2010-2025 Free Software Foundation, Inc.

   Written by Bruno Haible <bruno@clisp.org>, 2008.

   This file 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.

   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 for more details.

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

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

#include <config.h>

/* Specification.  */

#include <wchar.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

wint_t

btowc (int c)

{

  if (c != EOF)

    {

      char buf[1];

      wchar_t wc;

      buf[0] = c;

#if HAVE_MBRTOWC

      mbstate_t state;

      mbszero (&state);

      size_t ret = mbrtowc (&wc, buf, 1, &state);

      if (!(ret == (size_t)(-1) || ret == (size_t)(-2)))

#else

      if (mbtowc (&wc, buf, 1) >= 0)

#endif

        return wc;

    }

  return WEOF;

}