1/* 2 * Copyright (c) 1999-2010 Apple Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_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. The rights granted to you under the License 10 * may not be used to create, or enable the creation or redistribution of, 11 * unlawful or unlicensed copies of an Apple operating system, or to 12 * circumvent, violate, or enable the circumvention or violation of, any 13 * terms of an Apple operating system software license agreement. 14 * 15 * Please obtain a copy of the License at 16 * http://www.opensource.apple.com/apsl/ and read it before using this file. 17 * 18 * The Original Code and all software distributed under the License are 19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23 * Please see the License for the specific language governing rights and 24 * limitations under the License. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27 */ 28/* 29 * Mach Operating System 30 * Copyright (c) 1991,1990,1989 Carnegie Mellon University 31 * All Rights Reserved. 32 * 33 * Permission to use, copy, modify and distribute this software and its 34 * documentation is hereby granted, provided that both the copyright 35 * notice and this permission notice appear in all copies of the 36 * software, derivative works or modified versions, and any portions 37 * thereof, and that both notices appear in supporting documentation. 38 * 39 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 40 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 41 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 42 * 43 * Carnegie Mellon requests users of this software to return to 44 * 45 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 46 * School of Computer Science 47 * Carnegie Mellon University 48 * Pittsburgh PA 15213-3890 49 * 50 * any improvements or extensions that they make and grant Carnegie Mellon 51 * the rights to redistribute these changes. 52 */ 53/* 54 * mig_strncpy.c - by Joshua Block 55 * 56 * mig_strncpy -- Bounded string copy. Does what the library routine strncpy 57 * OUGHT to do: Copies the (null terminated) string in src into dest, a 58 * buffer of length len. Assures that the copy is still null terminated 59 * and doesn't overflow the buffer, truncating the copy if necessary. 60 * 61 * Parameters: 62 * 63 * dest - Pointer to destination buffer. 64 * 65 * src - Pointer to source string. 66 * 67 * len - Length of destination buffer. 68 * 69 * Result: 70 * length of string copied, INCLUDING the trailing 0. 71 */ 72#include <mach/mig_errors.h> 73 74int 75mig_strncpy( 76 char *dest, 77 const char *src, 78 int len) 79{ 80 int i; 81 82 if (len <= 0) { 83 return 0; 84 } 85 86 for (i = 1; i < len; i++) { 87 if (!(*dest++ = *src++)) { 88 return i; 89 } 90 } 91 92 *dest = '\0'; 93 return i; 94} 95