debug/mbstowcs_chk.c

   1 /* Copyright (C) 2005 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, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <locale.h>
  20 #include <string.h>
  21 #include <wchar.h>
  22
  23
  24 size_t
  25 __mbstowcs_chk (wchar_t *dst, const char *src, size_t len, size_t dstlen)
  26 {
  27   if (__builtin_expect (dstlen < len, 0))
  28     __chk_fail ();
  29
  30   mbstate_t state;
  31
  32   memset (&state, '\0', sizeof state);
  33   /* Return how many we wrote (or maybe an error).  */
  34   return __mbsrtowcs (dst, &src, len, &state);
  35 }