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) 1991-2018 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
  25 void *
  26 __mempcpy_chk (void *dstpp, const void *srcpp, size_t len, size_t dstlen)
  27 {
  28   if (__glibc_unlikely (dstlen < len))
  29     __chk_fail ();
  30
  31   return __mempcpy (dstpp, srcpp, len);
  32 }