/* Generic implementation of __explicit_bzero_chk.

   Copyright (C) 1991-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Torbjorn Granlund (tege@sics.se).

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

/* This is the generic definition of __explicit_bzero_chk.  The

   __explicit_bzero_chk symbol is used as the implementation of

   explicit_bzero throughout glibc.  If this file is overriden by an

   architecture, both __explicit_bzero_chk and

   __explicit_bzero_chk_internal have to be defined (the latter not as

   an IFUNC).  */

#include <string.h>

void

__explicit_bzero_chk (void *dst, size_t len, size_t dstlen)

{

  /* Inline __memset_chk to avoid a PLT reference to __memset_chk.  */

  if (__glibc_unlikely (dstlen < len))

    __chk_fail ();

  memset (dst, '\0', len);

  /* Compiler barrier.  */

  asm volatile ("" ::: "memory");

}

/* libc-internal references use the hidden

   __explicit_bzero_chk_internal symbol.  This is necessary if

   __explicit_bzero_chk is implemented as an IFUNC because some

   targets do not support hidden references to IFUNC symbols.  */

strong_alias (__explicit_bzero_chk, __explicit_bzero_chk_internal)