stdlib/wctomb.c

   1 /* Copyright (C) 1991, 1992, 1995, 1996 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 Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 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 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <stdlib.h>
  20 #include <wchar.h>
  21
  22
  23 extern mbstate_t __no_r_state;  /* Defined in mbtowc.c.  */
  24
  25 /* Convert WCHAR into its multibyte character representation,
  26    putting this in S and returning its length.
  27
  28    Attention: this function should NEVER be intentionally used.
  29    The interface is completely stupid.  The state is shared between
  30    all conversion functions.  You should use instead the restartable
  31    version `wcrtomb'.  */
  32 int
  33 wctomb (char *s, wchar_t wchar)
  34 {
  35   /* If S is NULL the function has to return null or not null
  36      depending on the encoding having a state depending encoding or
  37      not.  This is nonsense because any multibyte encoding has a
  38      state.  The ISO C amendment 1 corrects this while introducing the
  39      restartable functions.  We simply say here all encodings have a
  40      state.  */
  41   if (s == NULL)
  42     return 1;
  43
  44   return __wcrtomb (s, wchar, &__no_r_state);
  45 }