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File: [cvs.NetBSD.org] / src / lib / libc / ssp / strncat_chk.c (download)

Revision 1.2, Wed May 30 21:14:36 2007 UTC (13 years, 9 months ago) by tls
Branch: MAIN
CVS Tags: yamt-pf42-baseX, yamt-pf42-base, matt-mips64-base, matt-mips64, matt-armv6-prevmlocking, matt-armv6-nbase, matt-armv6-base, matt-armv6, keiichi-mipv6-base, keiichi-mipv6, hpcarm-cleanup-base, hpcarm-cleanup, cube-autoconf-base, cube-autoconf
Branch point for: yamt-pf42, wrstuden-fixsa, netbsd-4
Changes since 1.1: +3 -3 lines

Match usage of FORTIFY_SOURCE on other platforms by not requiring special
include path: the normal header files now include the "SSP" ones (which one
should note are not really named right: SSP and FORTIFY_SOURCE are independent
features).

Disable USE_SSP on targets where the compiler doesn't support it at all
(mips, alpha) or it's known broken (sh3).  But enable FORTIFY_SOURCE,
without SSP, on those platforms -- tested on mipsel.

/*	$NetBSD: strncat_chk.c,v 1.2 2007/05/30 21:14:36 tls Exp $	*/

/*-
 * Copyright (c) 2006 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Christos Zoulas.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *        This product includes software developed by the NetBSD
 *        Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
#include <sys/cdefs.h>
__RCSID("$NetBSD: strncat_chk.c,v 1.2 2007/05/30 21:14:36 tls Exp $");

/*LINTLIBRARY*/

#include <ssp/ssp.h>
#include <string.h>
#include <stdio.h>

char *
__strncat_chk(char * __restrict dst, char * __restrict src, size_t len,
    size_t slen)
{
	char *d;

	if (len == 0)
		return dst;

	if (len > slen)
		__chk_fail();

	for (d = dst; *d; d++) {
		if (slen-- == 0)
			__chk_fail();
	}

	do {
		if ((*d = *src++) == '\0')
			break;
		if (slen-- == 0)
			__chk_fail();
		d++;
	} while (--len != 0);

	if (slen-- == 0)
		__chk_fail();

	*d = '\0';
	return dst;
}