1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or https://opensource.org/licenses/CDDL-1.0.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright 2007 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25
26 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
27 /* All Rights Reserved */
28
29 /*
30 * University Copyright- Copyright (c) 1982, 1986, 1988
31 * The Regents of the University of California
32 * All Rights Reserved
33 *
34 * University Acknowledgment- Portions of this document are derived from
35 * software developed by the University of California, Berkeley, and its
36 * contributors.
37 */
38
39
40 #include <sys/types.h>
41 #include <sys/pathname.h>
42 #include <sys/kmem.h>
43 #include <sys/sysmacros.h>
44
45 /*
46 * Pathname utilities.
47 *
48 * In translating file names we copy each argument file
49 * name into a pathname structure where we operate on it.
50 * Each pathname structure can hold "pn_bufsize" characters
51 * including a terminating null, and operations here support
52 * allocating and freeing pathname structures, fetching
53 * strings from user space, getting the next character from
54 * a pathname, combining two pathnames (used in symbolic
55 * link processing), and peeling off the first component
56 * of a pathname.
57 */
58
59 /*
60 * Allocate contents of pathname structure. Structure is typically
61 * an automatic variable in calling routine for convenience.
62 *
63 * May sleep in the call to kmem_alloc() and so must not be called
64 * from interrupt level.
65 */
66 void
pn_alloc(struct pathname * pnp)67 pn_alloc(struct pathname *pnp)
68 {
69 pn_alloc_sz(pnp, MAXPATHLEN);
70 }
71 void
pn_alloc_sz(struct pathname * pnp,size_t sz)72 pn_alloc_sz(struct pathname *pnp, size_t sz)
73 {
74 pnp->pn_buf = kmem_alloc(sz, KM_SLEEP);
75 pnp->pn_bufsize = sz;
76 }
77
78 /*
79 * Free pathname resources.
80 */
81 void
pn_free(struct pathname * pnp)82 pn_free(struct pathname *pnp)
83 {
84 /* pn_bufsize is usually MAXPATHLEN, but may not be */
85 kmem_free(pnp->pn_buf, pnp->pn_bufsize);
86 pnp->pn_buf = NULL;
87 pnp->pn_bufsize = 0;
88 }
89