* sysdeps/unix/sysv/linux/configure.in: Bump minimal kernel
[glibc.git] / debug / wcscat_chk.c
blobeef04519fdbce0a8c2e7bfd7784c6d8ecc7de8ea
1 /* Copyright (C) 1995, 1996, 1997, 2001, 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.
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.
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.
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. */
20 #include <wchar.h>
23 /* Append SRC on the end of DEST. Check for overflows. */
24 wchar_t *
25 __wcscat_chk (wchar_t *dest, const wchar_t *src, size_t destlen)
27 register wchar_t *s1 = dest;
28 register const wchar_t *s2 = src;
29 wchar_t c;
31 /* Find the end of the string. */
34 if (__builtin_expect (destlen-- == 0, 0))
35 __chk_fail ();
36 c = *s1++;
38 while (c != L'\0');
40 /* Make S1 point before the next character, so we can increment
41 it while memory is read (wins on pipelined cpus). */
42 s1 -= 2;
43 ++destlen;
47 if (__builtin_expect (destlen-- == 0, 0))
48 __chk_fail ();
49 c = *s2++;
50 *++s1 = c;
52 while (c != L'\0');
54 return dest;