1/* 2 * Copyright (c) 2010-2013 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 28char * 29__stpncpy_chk (char *restrict dest, char *restrict src, 30 size_t len, size_t dstlen) 31{ 32 size_t n; 33 char *retval; 34 35 if (__builtin_expect (dstlen < len, 0)) 36 __chk_fail_overflow (); 37 38 retval = stpncpy (dest, src, len); // Normally returns a pointer to the \0 39 n = retval - dest + 1; 40 41 // Check if it's pointing to the location after the buffer after not writing \0 42 if (n == len + 1) 43 n--; 44 45 if (__builtin_expect (__chk_assert_no_overlap != 0, 1)) 46 __chk_overlap(dest, n, src, n); 47 48 return retval; 49} 50