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) 1991-2022 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <https://www.gnu.org/licenses/>.  */
  19
  20 #include <string.h>
  21 #include <memcopy.h>
  22
  23 #ifndef MEMMOVE_CHK
  24 # define MEMMOVE_CHK __memmove_chk
  25 #endif
  26
  27 void *
  28 MEMMOVE_CHK (void *dest, const void *src, size_t len, size_t destlen)
  29 {
  30   if (__glibc_unlikely (destlen < len))
  31     __chk_fail ();
  32
  33   return memmove (dest, src, len);
  34 }