1 /*
2 * Copyright (c) 2000-2006 Apple Computer, 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 * Copyright (c) 1997 by Apple Computer, Inc., all rights reserved
30 * Copyright (c) 1993 NeXT Computer, Inc.
31 *
32 */
33
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/ioctl.h>
37 #include <sys/tty.h>
38 #include <sys/conf.h>
39 #include <sys/kauth.h>
40 #include <sys/ucred.h>
41 #include <sys/proc_internal.h>
42 #include <sys/user.h>
43 #include <kern/task.h>
44 #include <kern/thread.h>
45 #include <vm/vm_map.h>
46 #include <machine/machine_routines.h>
47
48 /*
49 * copy a null terminated string from the kernel address space into
50 * the user address space.
51 * - if the user is denied write access, return EFAULT.
52 * - if the end of string isn't found before
53 * maxlen bytes are copied, return ENAMETOOLONG,
54 * indicating an incomplete copy.
55 * - otherwise, return 0, indicating success.
56 * the number of bytes copied is always returned in lencopied.
57 */
58 int
copyoutstr(const void * from,user_addr_t to,size_t maxlen,size_t * lencopied)59 copyoutstr(const void *from, user_addr_t to, size_t maxlen, size_t *lencopied)
60 {
61 size_t slen;
62 size_t len;
63 int error = 0;
64
65 slen = strlen(from) + 1;
66 if (slen > maxlen) {
67 error = ENAMETOOLONG;
68 }
69
70 len = min(maxlen, slen);
71 if (copyout(from, to, len)) {
72 error = EFAULT;
73 }
74 *lencopied = len;
75
76 return error;
77 }
78
79
80 /*
81 * copy a null terminated string from one point to another in
82 * the kernel address space.
83 * - no access checks are performed.
84 * - if the end of string isn't found before
85 * maxlen bytes are copied, return ENAMETOOLONG,
86 * indicating an incomplete copy.
87 * - otherwise, return 0, indicating success.
88 * the number of bytes copied is always returned in lencopied.
89 */
90 /* from ppc/fault_copy.c -Titan1T4 VERSION */
91 int
copystr(const void * vfrom,void * vto,size_t maxlen,size_t * lencopied)92 copystr(const void *vfrom, void *vto, size_t maxlen, size_t *lencopied)
93 {
94 size_t l;
95 char const *from = (char const *) vfrom;
96 char *to = (char *) vto;
97
98 for (l = 0; l < maxlen; l++) {
99 if ((*to++ = *from++) == '\0') {
100 if (lencopied) {
101 *lencopied = l + 1;
102 }
103 return 0;
104 }
105 }
106 if (lencopied) {
107 *lencopied = maxlen;
108 }
109 return ENAMETOOLONG;
110 }
111
112 int
copywithin(void * src,void * dst,size_t count)113 copywithin(void *src, void *dst, size_t count)
114 {
115 bcopy(src, dst, count);
116 return 0;
117 }
118