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, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22 /*
23 * Copyright (c) 1996, by Sun Microsystems, Inc.
24 * All rights reserved.
25 */
26
27 #pragma ident "%Z%%M% %I% %E% SMI"
28
29 /*
30 * m_pathmax: mks specific library routine.
31 *
32 * Copyright 1992 by Mortice Kern Systems Inc. All rights reserved.
33 *
34 */
35 #ifdef M_RCSID
36 #ifndef lint
37 static char rcsID[] = "$Header: /rd/src/libc/mks/rcs/m_pathma.c 1.4 1992/06/19 17:28:24 gord Exp $";
38 #endif
39 #endif /* M_RCSID */
40
41 #include <mks.h>
42 #include <unistd.h>
43 #include <stdlib.h>
44 #include <limits.h>
45 #include <stdio.h>
46 #include <errno.h>
47 #include <assert.h>
48
49 #ifdef m_pathmax
50 #undef m_pathmax /* in case its #define'd in mks.h */
51 #endif
52
53 /*f
54 * m_pathmax()
55 * - Determine current configuration value for PC_PATH_MAX
56 * relative to 'path'.
57 * - If 'path' is NULL, then relative to "/"
58 * - Return:
59 * configuration value
60 * or M_PATH_MAX if configuration value is indeterminate
61 * or -1 and errno is set if there's a problem with 'path'
62 */
63 int
m_pathmax(path)64 m_pathmax(path)
65 char* path;
66 {
67 int x;
68
69 if (path == NULL)
70 path = "/";
71
72 errno = 0;
73 x = pathconf(path, _PC_PATH_MAX);
74 if (x == -1) {
75 if (errno == 0) {
76 /*
77 * unlimited size - so we use M_PATH_MAX
78 *
79 * M_PATH_MAX defined in mkslocal.h
80 * - use a sufficiently LARGE number (e.g 1024 or 2048)
81 */
82 if (M_PATH_MAX < _POSIX_PATH_MAX) {
83 printf("m_pathmax(): Assert failure: ");
84 printf("M_PATH_MAX < _POSIX_PATH_MAX\n");
85 (void) exit(126);
86 }
87 return M_PATH_MAX;
88 } else {
89 /* ASSUME: cannot get errno = EINVAL because PC_PATH_MAX * must be supported, and must
90 * be associated with all *valid* 'path's
91 * (if 'path' is not valid, then we
92 * should get ENOENT or ENOTDIR,
93 * not EINVAL)
94 */
95 if (errno == EINVAL) {
96 printf("m_pathmax(): Assert failure: ");
97 printf("pathconf() = -1 and errno = EINVAL\n");
98 (void) exit(126);
99 }
100 return -1;
101 }
102 }
103
104 return x;
105 }
106
107 #ifdef TEST
108 /*
109 * compile with
110 * "make m_pathma COPTS=TEST" - using MKS make and MKS environment
111 * or
112 * "cc -o m_pathma -DTEST m_pathma.c" - to get sunos std libraries
113 *
114 */
main(argc,argv)115 main(argc, argv)
116 int argc;
117 char ** argv;
118 {
119 if (argc > 1) {
120 int x;
121 x = m_pathmax(argv[1]);
122 printf("m_pathmax('%s') returns %d\n", argv[1], x );
123 if (x == -1)
124 #ifdef __STDC__
125 printf("errno = %d (%s)\n", errno, strerror(errno));
126 #else
127 printf("errno = %d \n", errno);
128 #endif
129 } else
130 printf("usage: %s filename\n", argv[0]);
131
132 }
133 #endif /* TEST */
134