debug/mempcpy_chk.c

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