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) 1991-2015 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
  24 #ifndef MEMMOVE_CHK
  25 # define MEMMOVE_CHK __memmove_chk
  26 #endif
  27
  28 void *
  29 MEMMOVE_CHK (dest, src, len, destlen)
  30      void *dest;
  31      const void *src;
  32      size_t len;
  33      size_t destlen;
  34 {
  35   if (__glibc_unlikely (destlen < len))
  36     __chk_fail ();
  37
  38   return memmove (dest, src, len);
  39 }