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      1 /*	$NetBSD: strncat_chk.c,v 1.5 2014/09/17 00:39:28 joerg 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: strncat_chk.c,v 1.5 2014/09/17 00:39:28 joerg Exp $");
     33 
     34 /*LINTLIBRARY*/
     35 
     36 #include <ssp/ssp.h>
     37 #include <string.h>
     38 #include <stdio.h>
     39 
     40 char *__strncat_chk(char * __restrict, const char * __restrict, size_t,
     41     size_t);
     42 
     43 char *
     44 __strncat_chk(char * __restrict dst, const char * __restrict src, size_t len,
     45     size_t slen)
     46 {
     47 	char *d;
     48 
     49 	if (len == 0)
     50 		return dst;
     51 
     52 	if (len > slen)
     53 		__chk_fail();
     54 
     55 	for (d = dst; *d; d++) {
     56 		if (slen-- == 0)
     57 			__chk_fail();
     58 	}
     59 
     60 	do {
     61 		if ((*d = *src++) == '\0')
     62 			break;
     63 		if (slen-- == 0)
     64 			__chk_fail();
     65 		d++;
     66 	} while (--len != 0);
     67 
     68 	if (slen-- == 0)
     69 		__chk_fail();
     70 
     71 	*d = '\0';
     72 	return dst;
     73 }
     74