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2d21ac55 | 1 | /* |
6d2010ae | 2 | * Copyright (c) 1999-2010 Apple Inc. All rights reserved. |
2d21ac55 A |
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 | ||
74 | int | |
75 | mig_strncpy( | |
6d2010ae A |
76 | char *dest, |
77 | const char *src, | |
78 | int len) | |
2d21ac55 | 79 | { |
6d2010ae | 80 | int i; |
2d21ac55 | 81 | |
6d2010ae A |
82 | if (len <= 0) { |
83 | return 0; | |
84 | } | |
2d21ac55 | 85 | |
6d2010ae A |
86 | for (i = 1; i < len; i++) { |
87 | if (!(*dest++ = *src++)) { | |
88 | return i; | |
89 | } | |
90 | } | |
2d21ac55 A |
91 | |
92 | *dest = '\0'; | |
93 | return i; | |
94 | } | |
39037602 A |
95 | |
96 | /* | |
97 | * mig_strncpy_zerofill -- Bounded string copy. Does what the | |
98 | * library routine strncpy OUGHT to do: Copies the (null terminated) | |
99 | * string in src into dest, a buffer of length len. Assures that | |
100 | * the copy is still null terminated and doesn't overflow the buffer, | |
101 | * truncating the copy if necessary. If the string in src is smaller | |
102 | * than given length len, it will zero fill the remaining bytes in dest. | |
103 | * | |
104 | * Parameters: | |
105 | * | |
106 | * dest - Pointer to destination buffer. | |
107 | * | |
108 | * src - Pointer to source string. | |
109 | * | |
110 | * len - Length of destination buffer. | |
111 | * | |
112 | * Result: | |
113 | * length of string copied, INCLUDING the trailing 0. | |
114 | */ | |
115 | int | |
116 | mig_strncpy_zerofill( | |
117 | char *dest, | |
118 | const char *src, | |
119 | int len) | |
120 | { | |
121 | int i; | |
122 | boolean_t terminated = FALSE; | |
123 | int retval = 0; | |
124 | ||
125 | if (len <= 0 || dest == 0) { | |
126 | return 0; | |
127 | } | |
128 | ||
129 | if (src == 0) { | |
130 | terminated = TRUE; | |
131 | } | |
132 | ||
133 | for (i = 1; i < len; i++) { | |
134 | if (!terminated) { | |
135 | if (!(*dest++ = *src++)) { | |
136 | retval = i; | |
137 | terminated = TRUE; | |
138 | } | |
139 | } else { | |
140 | *dest++ = '\0'; | |
141 | } | |
142 | } | |
143 | ||
144 | *dest = '\0'; | |
145 | if (!terminated) { | |
146 | retval = i; | |
147 | } | |
148 | ||
149 | return retval; | |
150 | } |