debug/strcpy_chk.c

   1 /* Copyright (C) 1991-2017 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <stddef.h>
  19 #include <string.h>
  20 #include <memcopy.h>
  21
  22 #undef strcpy
  23
  24 /* Copy SRC to DEST with checking of destination buffer overflow.  */
  25 char *
  26 __strcpy_chk (char *dest, const char *src, size_t destlen)
  27 {
  28   size_t len = strlen (src);
  29   if (len >= destlen)
  30     __chk_fail ();
  31
  32   return memcpy (dest, src, len + 1);
  33 }