1 /* $NetBSD: sprintf_chk.c,v 1.4 2007/08/04 19:37:52 kristerw Exp $ */ 2 3 /*- 4 * Copyright (c) 2006 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 #include <sys/cdefs.h> 39 __RCSID("$NetBSD: sprintf_chk.c,v 1.4 2007/08/04 19:37:52 kristerw Exp $"); 40 41 /*LINTLIBRARY*/ 42 43 #include <ssp/ssp.h> 44 #include <stdio.h> 45 #include <limits.h> 46 #include <stdarg.h> 47 #include <ssp/stdio.h> 48 49 #undef vsnprintf 50 #undef vsprintf 51 52 int 53 /*ARGSUSED*/ 54 __sprintf_chk(char * __restrict buf, int flags, size_t slen, 55 const char * __restrict fmt, ...) 56 { 57 va_list ap; 58 int rv; 59 60 va_start(ap, fmt); 61 if (slen > (size_t)INT_MAX) 62 rv = vsprintf(buf, fmt, ap); 63 else { 64 if ((rv = vsnprintf(buf, slen, fmt, ap)) >= 0 && rv >= slen) 65 __chk_fail(); 66 } 67 va_end(ap); 68 69 return rv; 70 } 71