incubator-nuttx/libs/libc/wchar/lib_mbrtowc.c

/****************************************************************************
 * libs/libc/wchar/lib_mbrtowc.c
 *
 *   Copyright (c)1999 Citrus Project,
 *   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.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <nuttx/config.h>

#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <wchar.h>

#ifdef CONFIG_LIBC_WCHAR

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: mbrtowc
 *
 * Description:
 *   Convert a multibyte sequence to a wide character
 *
 ****************************************************************************/

size_t mbrtowc(FAR wchar_t *pwc, FAR const char *s,
               size_t n, FAR mbstate_t *ps)
{
  int retval = 0;

  if (s == NULL)
    {
      retval = mbtowc(NULL, "", 1);
    }
  else
    {
      retval = mbtowc(pwc, s, n);
    }

  if (retval == -1)
    {
      return (size_t)(-1);
    }
  else
    {
      return (size_t)retval;
    }
}
#endif