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) 1991-2023 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  }
      35  libc_hidden_builtin_def (MEMMOVE_CHK)