stdlib/wcstombs.c


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/* Copyright (C) 1991-2019 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   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, see
   <https://www.gnu.org/licenses/>.  */

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


/* Convert the `wchar_t' string in PWCS to a multibyte character string
   in S, writing no more than N characters.  Return the number of bytes
   written, or (size_t) -1 if an invalid `wchar_t' was found.  */
size_t
wcstombs (char *s, const wchar_t *pwcs, size_t n)
{
  mbstate_t state;

  memset (&state, '\0', sizeof state);

  /* Return how many we wrote (or maybe an error).  */
  return __wcsrtombs (s, &pwcs, n, &state);
}