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      1 /*	$NetBSD: stpcpy_chk.c,v 1.6 2015/05/09 15:42:21 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2013 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: stpcpy_chk.c,v 1.6 2015/05/09 15:42:21 christos Exp $");
     33 
     34 /*LINTLIBRARY*/
     35 
     36 #include <ssp/ssp.h>
     37 #include <string.h>
     38 
     39 #undef memcpy
     40 
     41 #if !__GNUC_PREREQ__(4, 8)
     42 char *__stpcpy_chk(char * __restrict, const char * __restrict, size_t);
     43 #endif
     44 
     45 char *
     46 __stpcpy_chk(char * __restrict dst, const char * __restrict src, size_t slen)
     47 {
     48 	size_t len = strlen(src);
     49 
     50 	if (len >= slen)
     51 		__chk_fail();
     52 
     53 	if (__ssp_overlap(src, dst, len))
     54 		__chk_fail();
     55 
     56 	(void)memcpy(dst, src, len + 1);
     57 	return dst + len;
     58 }
     59