1  /* Copyright (C) 1991-2023 Free Software Foundation, Inc.
       2     This file is part of the GNU C Library.
       3  
       4     The GNU C Library is free software; you can redistribute it and/or
       5     modify it under the terms of the GNU Lesser General Public
       6     License as published by the Free Software Foundation; either
       7     version 2.1 of the License, or (at your option) any later version.
       8  
       9     The GNU C Library is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12     Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public
      15     License along with the GNU C Library; if not, see
      16     <https://www.gnu.org/licenses/>.  */
      17  
      18  #include <stdlib.h>
      19  #include <string.h>
      20  #include <wchar.h>
      21  
      22  
      23  /* Convert the `wchar_t' string in PWCS to a multibyte character string
      24     in S, writing no more than N characters.  Return the number of bytes
      25     written, or (size_t) -1 if an invalid `wchar_t' was found.  */
      26  size_t
      27  wcstombs (char *s, const wchar_t *pwcs, size_t n)
      28  {
      29    mbstate_t state;
      30  
      31    memset (&state, '\0', sizeof state);
      32  
      33    /* Return how many we wrote (or maybe an error).  */
      34    return __wcsrtombs (s, &pwcs, n, &state);
      35  }