/* Copyright (C) 1996-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1996.

   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/>.  */

#include <wchar.h>

#define __need_ptrdiff_t

#include <stddef.h>

/* Copy SRC to DEST, returning the address of the terminating L'\0' in

   DEST.  Check for overflows.  */

wchar_t *

__wcpcpy_chk (wchar_t *dest, const wchar_t *src, size_t destlen)

{

  wchar_t *wcp = (wchar_t *) dest - 1;

  wint_t c;

  const ptrdiff_t off = src - dest + 1;

  do

    {

      if (__glibc_unlikely (destlen-- == 0))

	__chk_fail ();

      c = wcp[off];

      *++wcp = c;

    }

  while (c != L'\0');

  return wcp;

}