debug/wcsncpy_chk.c

   1 /* Copyright (C) 1995, 1996, 1997, 2005 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995.
   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 <wchar.h>
  21
  22
  23 /* Copy no more than N wide-characters of SRC to DEST.  */
  24 wchar_t *
  25 __wcsncpy_chk (wchar_t *dest, const wchar_t *src, size_t n, size_t destlen)
  26 {
  27   if (__builtin_expect (destlen < n, 0))
  28     __chk_fail ();
  29
  30   /* This function is not often enough used to justify not using a
  31      tail call.  */
  32   return __wcsncpy (dest, src, n);
  33 }