debug/wcsncpy_chk.c

   1 /* Copyright (C) 1995-2014 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, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <wchar.h>
  20
  21
  22 /* Copy no more than N wide-characters of SRC to DEST.  */
  23 wchar_t *
  24 __wcsncpy_chk (wchar_t *dest, const wchar_t *src, size_t n, size_t destlen)
  25 {
  26   if (__builtin_expect (destlen < n, 0))
  27     __chk_fail ();
  28
  29   /* This function is not often enough used to justify not using a
  30      tail call.  */
  31   return __wcsncpy (dest, src, n);
  32 }