1: /* Copyright (C) 1996, 1997, 2005 Free Software Foundation, Inc.
    2:    This file is part of the GNU C Library.
    3:    Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1996.
    4: 
    5:    The GNU C Library is free software; you can redistribute it and/or
    6:    modify it under the terms of the GNU Lesser General Public
    7:    License as published by the Free Software Foundation; either
    8:    version 2.1 of the License, or (at your option) any later version.
    9: 
   10:    The GNU C Library is distributed in the hope that it will be useful,
   11:    but WITHOUT ANY WARRANTY; without even the implied warranty of
   12:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   13:    Lesser General Public License for more details.
   14: 
   15:    You should have received a copy of the GNU Lesser General Public
   16:    License along with the GNU C Library; if not, write to the Free
   17:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   18:    02111-1307 USA.  */
   19: 
   20: #include <wchar.h>
   21: 
   22: #define __need_ptrdiff_t
   23: #include <stddef.h>
   24: 
   25: 
   26: /* Copy SRC to DEST, returning the address of the terminating L'\0' in
   27:    DEST.  Check for overflows.  */
   28: wchar_t *
   29: __wcpcpy_chk (wchar_t *dest, const wchar_t *src, size_t destlen)
   30: {
   31:   wchar_t *wcp = (wchar_t *) dest - 1;
   32:   wint_t c;
   33:   const ptrdiff_t off = src - dest + 1;
   34: 
   35:   do
   36:     {
   37:       if (__builtin_expect (destlen-- == 0, 0))
   38:         __chk_fail ();
   39:       c = wcp[off];
   40:       *++wcp = c;
   41:     }
   42:   while (c != L'\0');
   43: 
   44:   return wcp;
   45: }