debug/memmove_chk.c

   1 /* Copy memory to memory until the specified number of bytes
   2    has been copied with error checking.  Overlap is handled correctly.
   3    Copyright (C) 1991-2014 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5    Contributed by Torbjorn Granlund (tege@sics.se).
   6
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Lesser General Public
   9    License as published by the Free Software Foundation; either
  10    version 2.1 of the License, or (at your option) any later version.
  11
  12    The GNU C Library is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Lesser General Public License for more details.
  16
  17    You should have received a copy of the GNU Lesser General Public
  18    License along with the GNU C Library; if not, see
  19    <http://www.gnu.org/licenses/>.  */
  20
  21 #include <string.h>
  22 #include <memcopy.h>
  23 #include <pagecopy.h>
  24
  25 #ifndef MEMMOVE_CHK
  26 # define MEMMOVE_CHK __memmove_chk
  27 #endif
  28
  29 void *
  30 MEMMOVE_CHK (dest, src, len, destlen)
  31      void *dest;
  32      const void *src;
  33      size_t len;
  34      size_t destlen;
  35 {
  36   if (__builtin_expect (destlen < len, 0))
  37     __chk_fail ();
  38
  39   return memmove (dest, src, len);
  40 }