1*be04fec4SKyle Evans /*-
2*be04fec4SKyle Evans *
3*be04fec4SKyle Evans * SPDX-License-Identifier: BSD-2-Clause
4*be04fec4SKyle Evans *
5*be04fec4SKyle Evans * Copyright (c) 2006 The NetBSD Foundation, Inc.
6*be04fec4SKyle Evans * All rights reserved.
7*be04fec4SKyle Evans *
8*be04fec4SKyle Evans * This code is derived from software contributed to The NetBSD Foundation
9*be04fec4SKyle Evans * by Christos Zoulas.
10*be04fec4SKyle Evans *
11*be04fec4SKyle Evans * Redistribution and use in source and binary forms, with or without
12*be04fec4SKyle Evans * modification, are permitted provided that the following conditions
13*be04fec4SKyle Evans * are met:
14*be04fec4SKyle Evans * 1. Redistributions of source code must retain the above copyright
15*be04fec4SKyle Evans * notice, this list of conditions and the following disclaimer.
16*be04fec4SKyle Evans * 2. Redistributions in binary form must reproduce the above copyright
17*be04fec4SKyle Evans * notice, this list of conditions and the following disclaimer in the
18*be04fec4SKyle Evans * documentation and/or other materials provided with the distribution.
19*be04fec4SKyle Evans *
20*be04fec4SKyle Evans * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
21*be04fec4SKyle Evans * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22*be04fec4SKyle Evans * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23*be04fec4SKyle Evans * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
24*be04fec4SKyle Evans * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25*be04fec4SKyle Evans * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26*be04fec4SKyle Evans * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27*be04fec4SKyle Evans * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28*be04fec4SKyle Evans * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29*be04fec4SKyle Evans * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30*be04fec4SKyle Evans * POSSIBILITY OF SUCH DAMAGE.
31*be04fec4SKyle Evans */
32*be04fec4SKyle Evans #include <sys/cdefs.h>
33*be04fec4SKyle Evans __RCSID("$NetBSD: strncat_chk.c,v 1.5 2014/09/17 00:39:28 joerg Exp $");
34*be04fec4SKyle Evans
35*be04fec4SKyle Evans #include <stdio.h>
36*be04fec4SKyle Evans #include <string.h>
37*be04fec4SKyle Evans
38*be04fec4SKyle Evans #include <ssp/string.h>
39*be04fec4SKyle Evans
40*be04fec4SKyle Evans char *
__strncat_chk(char * __restrict dst,const char * __restrict src,size_t len,size_t slen)41*be04fec4SKyle Evans __strncat_chk(char * __restrict dst, const char * __restrict src, size_t len,
42*be04fec4SKyle Evans size_t slen)
43*be04fec4SKyle Evans {
44*be04fec4SKyle Evans char *d;
45*be04fec4SKyle Evans
46*be04fec4SKyle Evans if (len == 0)
47*be04fec4SKyle Evans return (dst);
48*be04fec4SKyle Evans
49*be04fec4SKyle Evans if (len > slen)
50*be04fec4SKyle Evans __chk_fail();
51*be04fec4SKyle Evans
52*be04fec4SKyle Evans for (d = dst; *d; d++) {
53*be04fec4SKyle Evans if (slen-- == 0)
54*be04fec4SKyle Evans __chk_fail();
55*be04fec4SKyle Evans }
56*be04fec4SKyle Evans
57*be04fec4SKyle Evans do {
58*be04fec4SKyle Evans if ((*d = *src++) == '\0')
59*be04fec4SKyle Evans break;
60*be04fec4SKyle Evans if (slen-- == 0)
61*be04fec4SKyle Evans __chk_fail();
62*be04fec4SKyle Evans d++;
63*be04fec4SKyle Evans } while (--len != 0);
64*be04fec4SKyle Evans
65*be04fec4SKyle Evans if (slen-- == 0)
66*be04fec4SKyle Evans __chk_fail();
67*be04fec4SKyle Evans
68*be04fec4SKyle Evans *d = '\0';
69*be04fec4SKyle Evans return (dst);
70*be04fec4SKyle Evans }
71