getmntopts.c revision 52055 
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 52055 1999-10-09 11:54:14Z phk $";
40#endif
41#endif /* not lint */
42
43#include <sys/param.h>
44#include <sys/stat.h>
45
46#include <err.h>
47#include <errno.h>
48#include <stdlib.h>
49#include <string.h>
50#include <sysexits.h>
51
52#include "mntopts.h"
53
54int getmnt_silent = 0;
55
56void
57getmntopts(options, m0, flagp, altflagp)
58	const char *options;
59	const struct mntopt *m0;
60	int *flagp;
61	int *altflagp;
62{
63	const struct mntopt *m;
64	int negative, len;
65	char *opt, *optbuf, *p;
66	int *thisflagp;
67
68	/* Copy option string, since it is about to be torn asunder... */
69	if ((optbuf = strdup(options)) == NULL)
70		err(1, NULL);
71
72	for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
73		/* Check for "no" prefix. */
74		if (opt[0] == 'n' && opt[1] == 'o') {
75			negative = 1;
76			opt += 2;
77		} else
78			negative = 0;
79
80		/*
81		 * for options with assignments in them (ie. quotas)
82		 * ignore the assignment as it's handled elsewhere
83		 */
84		p = strchr(opt, '=');
85		if (p)
86			 *++p = '\0';
87
88		/* Scan option table. */
89		for (m = m0; m->m_option != NULL; ++m) {
90			len = strlen(m->m_option);
91			if (strncasecmp(opt, m->m_option, len) == 0)
92				if (   m->m_option[len]	== '\0'
93				    || m->m_option[len]	== '='
94				   )
95				break;
96		}
97
98		/* Save flag, or fail if option is not recognized. */
99		if (m->m_option) {
100			thisflagp = m->m_altloc ? altflagp : flagp;
101			if (negative == m->m_inverse)
102				*thisflagp |= m->m_flag;
103			else
104				*thisflagp &= ~m->m_flag;
105		} else if (!getmnt_silent) {
106			errx(1, "-o %s: option not supported", opt);
107		}
108	}
109
110	free(optbuf);
111}
112
113void
114rmslashes(rrpin, rrpout)
115	char *rrpin;
116	char *rrpout;
117{
118	char *rrpoutstart;
119
120	*rrpout = *rrpin;
121	for (rrpoutstart = rrpout; *rrpin != '\0'; *rrpout++ = *rrpin++) {
122
123		/* skip all double slashes */
124		while (*rrpin == '/' && *(rrpin + 1) == '/')
125			 rrpin++;
126	}
127
128	/* remove trailing slash if necessary */
129	if (rrpout - rrpoutstart > 1 && *(rrpout - 1) == '/')
130		*(rrpout - 1) = '\0';
131	else
132		*rrpout = '\0';
133}
134
135void
136checkpath(path, resolved)
137	const char *path;
138	char *resolved;
139{
140	struct stat sb;
141
142	if (realpath(path, resolved) != NULL && stat(resolved, &sb) == 0) {
143		if (!S_ISDIR(sb.st_mode))
144			errx(EX_USAGE, "%s: not a directory", resolved);
145	} else
146		errx(EX_USAGE, "%s: %s", resolved, strerror(errno));
147}
148