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      1 /*	$NetBSD: sprintf_chk.c,v 1.6 2009/02/05 05:40:36 lukem 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  *
     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 #include <sys/cdefs.h>
     32 __RCSID("$NetBSD: sprintf_chk.c,v 1.6 2009/02/05 05:40:36 lukem Exp $");
     33 
     34 /*LINTLIBRARY*/
     35 
     36 #include <ssp/ssp.h>
     37 #include <stdio.h>
     38 #include <limits.h>
     39 #include <stdarg.h>
     40 #include <ssp/stdio.h>
     41 
     42 #undef vsnprintf
     43 #undef vsprintf
     44 
     45 int
     46 /*ARGSUSED*/
     47 __sprintf_chk(char * __restrict buf, int flags, size_t slen,
     48     const char * __restrict fmt, ...)
     49 {
     50 	va_list ap;
     51 	int rv;
     52 
     53 	va_start(ap, fmt);
     54 	if (slen > (size_t)INT_MAX)
     55 		rv = vsprintf(buf, fmt, ap);
     56 	else {
     57 		if ((rv = vsnprintf(buf, slen, fmt, ap)) >= 0 && (size_t)rv >= slen)
     58 			__chk_fail();
     59 	}
     60 	va_end(ap);
     61 
     62 	return rv;
     63 }
     64