debug/wcscpy_chk.c

   1 /* Copyright (C) 1995, 1996, 1997, 2003, 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>, 1995.
   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 <stddef.h>
  21 #include <wchar.h>
  22
  23
  24 /* Copy SRC to DEST.  */
  25 wchar_t *
  26 __wcscpy_chk (wchar_t *dest, const wchar_t *src, size_t n)
  27 {
  28   wint_t c;
  29   wchar_t *wcp;
  30
  31   if (__alignof__ (wchar_t) >= sizeof (wchar_t))
  32     {
  33       const ptrdiff_t off = dest - src - 1;
  34
  35       wcp = (wchar_t *) src;
  36
  37       do
  38         {
  39           if (__builtin_expect (n-- == 0, 0))
  40             __chk_fail ();
  41           c = *wcp++;
  42           wcp[off] = c;
  43         }
  44       while (c != L'\0');
  45     }
  46   else
  47     {
  48       wcp = dest;
  49
  50       do
  51         {
  52           if (__builtin_expect (n-- == 0, 0))
  53             __chk_fail ();
  54           c = *src++;
  55           *wcp++ = c;
  56         }
  57       while (c != L'\0');
  58     }
  59
  60   return dest;
  61 }