minix/lib/nbsd_libc/ssp/strncat_chk.c

75 lines
2.1 KiB
C
Raw Normal View History

/* $NetBSD: strncat_chk.c,v 1.4 2009/11/17 20:44:26 drochner 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.
*
* 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 1.4 2009/11/17 20:44:26 drochner Exp $");
/*LINTLIBRARY*/
#include <ssp/ssp.h>
#include <string.h>
#include <stdio.h>
#if __SSP_FORTIFY_LEVEL > 0
char *
__strncat_chk(char * __restrict dst, const 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;
}
#endif