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 /*
28 * m_pathmax: mks specific library routine.
29 *
30 * Copyright 1992 by Mortice Kern Systems Inc. All rights reserved.
31 *
32 */
33 #ifdef M_RCSID
34 #ifndef lint
35 static char rcsID[] = "$Header: /rd/src/libc/mks/rcs/m_pathma.c 1.4 1992/06/19 17:28:24 gord Exp $";
36 #endif
37 #endif /* M_RCSID */
38
39 #include <mks.h>
40 #include <unistd.h>
41 #include <stdlib.h>
42 #include <limits.h>
43 #include <stdio.h>
44 #include <errno.h>
45 #include <assert.h>
46
47 #ifdef m_pathmax
48 #undef m_pathmax /* in case its #define'd in mks.h */
49 #endif
50
51 /*f
52 * m_pathmax()
53 * - Determine current configuration value for PC_PATH_MAX
54 * relative to 'path'.
55 * - If 'path' is NULL, then relative to "/"
56 * - Return:
57 * configuration value
58 * or M_PATH_MAX if configuration value is indeterminate
59 * or -1 and errno is set if there's a problem with 'path'
60 */
61 int
m_pathmax(path)62 m_pathmax(path)
63 char* path;
64 {
65 int x;
66
67 if (path == NULL)
68 path = "/";
69
70 errno = 0;
71 x = pathconf(path, _PC_PATH_MAX);
72 if (x == -1) {
73 if (errno == 0) {
74 /*
75 * unlimited size - so we use M_PATH_MAX
76 *
77 * M_PATH_MAX defined in mkslocal.h
78 * - use a sufficiently LARGE number (e.g 1024 or 2048)
79 */
80 if (M_PATH_MAX < _POSIX_PATH_MAX) {
81 printf("m_pathmax(): Assert failure: ");
82 printf("M_PATH_MAX < _POSIX_PATH_MAX\n");
83 (void) exit(126);
84 }
85 return M_PATH_MAX;
86 } else {
87 /* ASSUME: cannot get errno = EINVAL because PC_PATH_MAX * must be supported, and must
88 * be associated with all *valid* 'path's
89 * (if 'path' is not valid, then we
90 * should get ENOENT or ENOTDIR,
91 * not EINVAL)
92 */
93 if (errno == EINVAL) {
94 printf("m_pathmax(): Assert failure: ");
95 printf("pathconf() = -1 and errno = EINVAL\n");
96 (void) exit(126);
97 }
98 return -1;
99 }
100 }
101
102 return x;
103 }
104
105 #ifdef TEST
106 /*
107 * compile with
108 * "make m_pathma COPTS=TEST" - using MKS make and MKS environment
109 * or
110 * "cc -o m_pathma -DTEST m_pathma.c" - to get sunos std libraries
111 *
112 */
main(argc,argv)113 main(argc, argv)
114 int argc;
115 char ** argv;
116 {
117 if (argc > 1) {
118 int x;
119 x = m_pathmax(argv[1]);
120 printf("m_pathmax('%s') returns %d\n", argv[1], x );
121 if (x == -1)
122 #ifdef __STDC__
123 printf("errno = %d (%s)\n", errno, strerror(errno));
124 #else
125 printf("errno = %d \n", errno);
126 #endif
127 } else
128 printf("usage: %s filename\n", argv[0]);
129
130 }
131 #endif /* TEST */
132