vsprintf_chk.c revision 1.6 1 1.6 lukem /* $NetBSD: vsprintf_chk.c,v 1.6 2009/02/05 05:39:38 lukem Exp $ */
2 1.1 tls
3 1.1 tls /*-
4 1.1 tls * Copyright (c) 2006 The NetBSD Foundation, Inc.
5 1.1 tls * All rights reserved.
6 1.1 tls *
7 1.1 tls * This code is derived from software contributed to The NetBSD Foundation
8 1.1 tls * by Christos Zoulas.
9 1.1 tls *
10 1.1 tls * Redistribution and use in source and binary forms, with or without
11 1.1 tls * modification, are permitted provided that the following conditions
12 1.1 tls * are met:
13 1.1 tls * 1. Redistributions of source code must retain the above copyright
14 1.1 tls * notice, this list of conditions and the following disclaimer.
15 1.1 tls * 2. Redistributions in binary form must reproduce the above copyright
16 1.1 tls * notice, this list of conditions and the following disclaimer in the
17 1.1 tls * documentation and/or other materials provided with the distribution.
18 1.1 tls *
19 1.1 tls * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 1.1 tls * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 1.1 tls * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 1.1 tls * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 1.1 tls * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 1.1 tls * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 1.1 tls * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 1.1 tls * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 1.1 tls * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 1.1 tls * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 1.1 tls * POSSIBILITY OF SUCH DAMAGE.
30 1.1 tls */
31 1.1 tls #include <sys/cdefs.h>
32 1.6 lukem __RCSID("$NetBSD: vsprintf_chk.c,v 1.6 2009/02/05 05:39:38 lukem Exp $");
33 1.1 tls
34 1.1 tls /*LINTLIBRARY*/
35 1.1 tls
36 1.2 tls #include <ssp/ssp.h>
37 1.1 tls #include <stdio.h>
38 1.1 tls #include <limits.h>
39 1.1 tls #include <stdarg.h>
40 1.4 kristerw #include <ssp/stdio.h>
41 1.1 tls
42 1.3 christos #undef vsprintf
43 1.3 christos #undef vsnprintf
44 1.3 christos
45 1.1 tls /*ARGSUSED*/
46 1.1 tls int
47 1.1 tls __vsprintf_chk(char * __restrict buf, int flags, size_t slen,
48 1.1 tls const char * __restrict fmt, va_list ap)
49 1.1 tls {
50 1.1 tls int rv;
51 1.1 tls
52 1.1 tls if (slen > (size_t)INT_MAX)
53 1.1 tls rv = vsprintf(buf, fmt, ap);
54 1.1 tls else {
55 1.6 lukem if ((rv = vsnprintf(buf, slen, fmt, ap)) >= 0 && (size_t)rv >= slen)
56 1.1 tls __chk_fail();
57 1.1 tls }
58 1.1 tls
59 1.1 tls return rv;
60 1.1 tls }
61