1 /* $NetBSD: stpncpy_chk.c,v 1.3 2015/05/09 15:42:21 christos Exp $ */
2
3 /*-
4 * Copyright (c) 2013 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Christos Zoulas.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31 #define _DEFAULT_SOURCE
32 #include <sys/cdefs.h>
33 __RCSID("$NetBSD: stpncpy_chk.c,v 1.3 2015/05/09 15:42:21 christos Exp $");
34
35 /*LINTLIBRARY*/
36
37 #include <ssp/ssp.h>
38 #include <string.h>
39
40 #undef stpncpy
41
42 #if !__GNUC_PREREQ__(4, 8)
43 char *__stpncpy_chk(char * __restrict, const char * __restrict, size_t, size_t);
44 #endif
45
46 char *
__stpncpy_chk(char * __restrict dst,const char * __restrict src,size_t len,size_t slen)47 __stpncpy_chk(char * __restrict dst, const char * __restrict src, size_t len,
48 size_t slen)
49 {
50 if (len > slen)
51 __chk_fail();
52
53 if (__ssp_overlap(src, dst, len))
54 __chk_fail();
55
56 return stpncpy(dst, src, len);
57 }
58
