getmntopts.c revision 50476 
1/*-
2 * Copyright (c) 1994
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35#if 0
36static char sccsid[] = "@(#)getmntopts.c	8.3 (Berkeley) 3/29/95";
37#else
38static const char rcsid[] =
39  "$FreeBSD: head/sbin/mount/getmntopts.c 50476 1999-08-28 00:22:10Z peter $";
40#endif
41#endif /* not lint */
42
43#include <sys/param.h>
44
45#include <err.h>
46#include <stdlib.h>
47#include <string.h>
48
49#include "mntopts.h"
50
51int getmnt_silent = 0;
52
53void
54getmntopts(options, m0, flagp, altflagp)
55	const char *options;
56	const struct mntopt *m0;
57	int *flagp;
58	int *altflagp;
59{
60	const struct mntopt *m;
61	int negative, len;
62	char *opt, *optbuf, *p;
63	int *thisflagp;
64
65	/* Copy option string, since it is about to be torn asunder... */
66	if ((optbuf = strdup(options)) == NULL)
67		err(1, NULL);
68
69	for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
70		/* Check for "no" prefix. */
71		if (opt[0] == 'n' && opt[1] == 'o') {
72			negative = 1;
73			opt += 2;
74		} else
75			negative = 0;
76
77		/*
78		 * for options with assignments in them (ie. quotas)
79		 * ignore the assignment as it's handled elsewhere
80		 */
81		p = strchr(opt, '=');
82		if (p)
83			 *++p = '\0';
84
85		/* Scan option table. */
86		for (m = m0; m->m_option != NULL; ++m) {
87			len = strlen(m->m_option);
88			if (strncasecmp(opt, m->m_option, len) == 0)
89				if (   m->m_option[len]	== '\0'
90				    || m->m_option[len]	== '='
91				   )
92				break;
93		}
94
95		/* Save flag, or fail if option is not recognized. */
96		if (m->m_option) {
97			thisflagp = m->m_altloc ? altflagp : flagp;
98			if (negative == m->m_inverse)
99				*thisflagp |= m->m_flag;
100			else
101				*thisflagp &= ~m->m_flag;
102		} else if (!getmnt_silent) {
103			errx(1, "-o %s: option not supported", opt);
104		}
105	}
106
107	free(optbuf);
108}
109