i386: Move futex functions from lowlevellock.h to lowlevellock-futex.h.
[glibc.git] / debug / strcat_chk.c
blob653efb47be5bbbda9a083ceee92ac45354fbd630
1 /* Copyright (C) 1991-2014 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <http://www.gnu.org/licenses/>. */
18 #include <string.h>
19 #include <memcopy.h>
22 /* Append SRC on the end of DEST. */
23 char *
24 __strcat_chk (dest, src, destlen)
25 char *dest;
26 const char *src;
27 size_t destlen;
29 char *s1 = dest;
30 const char *s2 = src;
31 char c;
33 /* Find the end of the string. */
36 if (__glibc_unlikely (destlen-- == 0))
37 __chk_fail ();
38 c = *s1++;
40 while (c != '\0');
42 /* Make S1 point before the next character, so we can increment
43 it while memory is read (wins on pipelined cpus). */
44 ++destlen;
45 s1 -= 2;
49 if (__glibc_unlikely (destlen-- == 0))
50 __chk_fail ();
51 c = *s2++;
52 *++s1 = c;
54 while (c != '\0');
56 return dest;