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glibc  2.9
wcscpy_chk.c
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00001 /* Copyright (C) 1995, 1996, 1997, 2003, 2005 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003    Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.  */
00019 
00020 #include <stddef.h>
00021 #include <wchar.h>
00022 
00023 
00024 /* Copy SRC to DEST.  */
00025 wchar_t *
00026 __wcscpy_chk (wchar_t *dest, const wchar_t *src, size_t n)
00027 {
00028   wint_t c;
00029   wchar_t *wcp;
00030 
00031   if (__alignof__ (wchar_t) >= sizeof (wchar_t))
00032     {
00033       const ptrdiff_t off = dest - src - 1;
00034 
00035       wcp = (wchar_t *) src;
00036 
00037       do
00038        {
00039          if (__builtin_expect (n-- == 0, 0))
00040            __chk_fail ();
00041          c = *wcp++;
00042          wcp[off] = c;
00043        }
00044       while (c != L'\0');
00045     }
00046   else
00047     {
00048       wcp = dest;
00049 
00050       do
00051        {
00052          if (__builtin_expect (n-- == 0, 0))
00053            __chk_fail ();
00054          c = *src++;
00055          *wcp++ = c;
00056        }
00057       while (c != L'\0');
00058     }
00059 
00060   return dest;
00061 }