stdlib/wctomb.c

   1 /* Copyright (C) 1991, 1992, 1995-1999, 2002, 2008
   2    Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <stdlib.h>
  21 #include <string.h>
  22 #include <wchar.h>
  23 #include <gconv.h>
  24 #include <wcsmbs/wcsmbsload.h>
  25
  26
  27 /* Shared with __wctomb_chk.  */
  28 mbstate_t __wctomb_state attribute_hidden;
  29
  30 /* Convert WCHAR into its multibyte character representation,
  31    putting this in S and returning its length.
  32
  33    Attention: this function should NEVER be intentionally used.
  34    The interface is completely stupid.  The state is shared between
  35    all conversion functions.  You should use instead the restartable
  36    version `wcrtomb'.  */
  37 int
  38 wctomb (char *s, wchar_t wchar)
  39 {
  40   /* If S is NULL the function has to return null or not null
  41      depending on the encoding having a state depending encoding or
  42      not.  */
  43   if (s == NULL)
  44     {
  45       const struct gconv_fcts *fcts;
  46
  47       /* Get the conversion functions.  */
  48       fcts = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE));
  49
  50       /* This is an extension in the Unix standard which does not directly
  51          violate ISO C.  */
  52       memset (&__wctomb_state, '\0', sizeof __wctomb_state);
  53
  54       return fcts->tomb->__stateful;
  55     }
  56
  57   return __wcrtomb (s, wchar, &__wctomb_state);
  58 }
  59 libc_hidden_def (wctomb)