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	1	/*
	2	* Copyright (c) 2007-2013 Apple Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. Please obtain a copy of the License at
	10	* http://www.opensource.apple.com/apsl/ and read it before using this
	11	* file.
	12	*
	13	* The Original Code and all software distributed under the License are
	14	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	15	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	16	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	17	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	18	* Please see the License for the specific language governing rights and
	19	* limitations under the License.
	20	*
	21	* @APPLE_LICENSE_HEADER_END@
	22	*/
	23
	24	#include <stdlib.h>
	25	#include <string.h>
	26	#include "secure.h"
	27
	28	char *
	29	__strncat_chk (char restrict dest, const char restrict append,
	30	size_t len, size_t dstlen)
	31	{
	32	size_t len1 = strlen(dest);
	33	size_t len2 = strnlen(append, len);
	34
	35	if (__builtin_expect (dstlen < len1 + len2 + 1, 0))
	36	__chk_fail_overflow ();
	37
	38	if (__builtin_expect (__chk_assert_no_overlap != 0, 1))
	39	__chk_overlap(dest, len1 + len2 + 1, append, len2 + 1);
	40
	41	/* memmove() all but the NUL, since it might not actually be NUL */
	42	memcpy(dest + len1, append, len2);
	43	dest[len1 + len2] = '\0';
	44
	45	return dest;
	46	}