getmntopts.c revision 114589 
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#if 0
35#ifndef lint
36static char sccsid[] = "@(#)getmntopts.c	8.3 (Berkeley) 3/29/95";
37#endif /* not lint */
38#endif
39#include <sys/cdefs.h>
40__FBSDID("$FreeBSD: head/sbin/mount/getmntopts.c 114589 2003-05-03 18:41:59Z obrien $");
41
42#include <sys/param.h>
43#include <sys/stat.h>
44
45#include <err.h>
46#include <errno.h>
47#include <stdlib.h>
48#include <string.h>
49#include <sysexits.h>
50
51#include "mntopts.h"
52
53int getmnt_silent = 0;
54
55void
56getmntopts(options, m0, flagp, altflagp)
57	const char *options;
58	const struct mntopt *m0;
59	int *flagp;
60	int *altflagp;
61{
62	const struct mntopt *m;
63	int negative, len;
64	char *opt, *optbuf, *p;
65	int *thisflagp;
66
67	/* Copy option string, since it is about to be torn asunder... */
68	if ((optbuf = strdup(options)) == NULL)
69		err(1, NULL);
70
71	for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
72		/* Check for "no" prefix. */
73		if (opt[0] == 'n' && opt[1] == 'o') {
74			negative = 1;
75			opt += 2;
76		} else
77			negative = 0;
78
79		/*
80		 * for options with assignments in them (ie. quotas)
81		 * ignore the assignment as it's handled elsewhere
82		 */
83		p = strchr(opt, '=');
84		if (p)
85			 *++p = '\0';
86
87		/* Scan option table. */
88		for (m = m0; m->m_option != NULL; ++m) {
89			len = strlen(m->m_option);
90			if (strncasecmp(opt, m->m_option, len) == 0)
91				if (   m->m_option[len]	== '\0'
92				    || m->m_option[len]	== '='
93				   )
94				break;
95		}
96
97		/* Save flag, or fail if option is not recognized. */
98		if (m->m_option) {
99			thisflagp = m->m_altloc ? altflagp : flagp;
100			if (negative == m->m_inverse)
101				*thisflagp |= m->m_flag;
102			else
103				*thisflagp &= ~m->m_flag;
104		} else if (!getmnt_silent) {
105			errx(1, "-o %s: option not supported", opt);
106		}
107	}
108
109	free(optbuf);
110}
111
112void
113rmslashes(rrpin, rrpout)
114	char *rrpin;
115	char *rrpout;
116{
117	char *rrpoutstart;
118
119	*rrpout = *rrpin;
120	for (rrpoutstart = rrpout; *rrpin != '\0'; *rrpout++ = *rrpin++) {
121
122		/* skip all double slashes */
123		while (*rrpin == '/' && *(rrpin + 1) == '/')
124			 rrpin++;
125	}
126
127	/* remove trailing slash if necessary */
128	if (rrpout - rrpoutstart > 1 && *(rrpout - 1) == '/')
129		*(rrpout - 1) = '\0';
130	else
131		*rrpout = '\0';
132}
133
134void
135checkpath(path, resolved)
136	const char *path;
137	char *resolved;
138{
139	struct stat sb;
140
141	if (realpath(path, resolved) != NULL && stat(resolved, &sb) == 0) {
142		if (!S_ISDIR(sb.st_mode))
143			errx(EX_USAGE, "%s: not a directory", resolved);
144	} else
145		errx(EX_USAGE, "%s: %s", resolved, strerror(errno));
146}
147