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sprintf_chk.c revision 1.5.8.2 
      1  1.5.8.2  martin /*	$NetBSD: sprintf_chk.c,v 1.5.8.2 2008/04/28 20:23:01 martin Exp $	*/
      2  1.5.8.2  martin 
      3  1.5.8.2  martin /*-
      4  1.5.8.2  martin  * Copyright (c) 2006 The NetBSD Foundation, Inc.
      5  1.5.8.2  martin  * All rights reserved.
      6  1.5.8.2  martin  *
      7  1.5.8.2  martin  * This code is derived from software contributed to The NetBSD Foundation
      8  1.5.8.2  martin  * by Christos Zoulas.
      9  1.5.8.2  martin  *
     10  1.5.8.2  martin  * Redistribution and use in source and binary forms, with or without
     11  1.5.8.2  martin  * modification, are permitted provided that the following conditions
     12  1.5.8.2  martin  * are met:
     13  1.5.8.2  martin  * 1. Redistributions of source code must retain the above copyright
     14  1.5.8.2  martin  *    notice, this list of conditions and the following disclaimer.
     15  1.5.8.2  martin  * 2. Redistributions in binary form must reproduce the above copyright
     16  1.5.8.2  martin  *    notice, this list of conditions and the following disclaimer in the
     17  1.5.8.2  martin  *    documentation and/or other materials provided with the distribution.
     18  1.5.8.2  martin  *
     19  1.5.8.2  martin  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  1.5.8.2  martin  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  1.5.8.2  martin  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  1.5.8.2  martin  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  1.5.8.2  martin  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  1.5.8.2  martin  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  1.5.8.2  martin  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  1.5.8.2  martin  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  1.5.8.2  martin  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  1.5.8.2  martin  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  1.5.8.2  martin  * POSSIBILITY OF SUCH DAMAGE.
     30  1.5.8.2  martin  */
     31  1.5.8.2  martin #include <sys/cdefs.h>
     32  1.5.8.2  martin __RCSID("$NetBSD: sprintf_chk.c,v 1.5.8.2 2008/04/28 20:23:01 martin Exp $");
     33  1.5.8.2  martin 
     34  1.5.8.2  martin /*LINTLIBRARY*/
     35  1.5.8.2  martin 
     36  1.5.8.2  martin #include <ssp/ssp.h>
     37  1.5.8.2  martin #include <stdio.h>
     38  1.5.8.2  martin #include <limits.h>
     39  1.5.8.2  martin #include <stdarg.h>
     40  1.5.8.2  martin #include <ssp/stdio.h>
     41  1.5.8.2  martin 
     42  1.5.8.2  martin #undef vsnprintf
     43  1.5.8.2  martin #undef vsprintf
     44  1.5.8.2  martin 
     45  1.5.8.2  martin int
     46  1.5.8.2  martin /*ARGSUSED*/
     47  1.5.8.2  martin __sprintf_chk(char * __restrict buf, int flags, size_t slen,
     48  1.5.8.2  martin     const char * __restrict fmt, ...)
     49  1.5.8.2  martin {
     50  1.5.8.2  martin 	va_list ap;
     51  1.5.8.2  martin 	int rv;
     52  1.5.8.2  martin 
     53  1.5.8.2  martin 	va_start(ap, fmt);
     54  1.5.8.2  martin 	if (slen > (size_t)INT_MAX)
     55  1.5.8.2  martin 		rv = vsprintf(buf, fmt, ap);
     56  1.5.8.2  martin 	else {
     57  1.5.8.2  martin 		if ((rv = vsnprintf(buf, slen, fmt, ap)) >= 0 && rv >= slen)
     58  1.5.8.2  martin 			__chk_fail();
     59  1.5.8.2  martin 	}
     60  1.5.8.2  martin 	va_end(ap);
     61  1.5.8.2  martin 
     62  1.5.8.2  martin 	return rv;
     63  1.5.8.2  martin }
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