getmntopts.c revision 138094 
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 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#if 0
31#ifndef lint
32static char sccsid[] = "@(#)getmntopts.c	8.3 (Berkeley) 3/29/95";
33#endif /* not lint */
34#endif
35#include <sys/cdefs.h>
36__FBSDID("$FreeBSD: head/sbin/mount/getmntopts.c 138094 2004-11-25 13:24:46Z phk $");
37
38#include <sys/param.h>
39#include <sys/stat.h>
40
41#include <err.h>
42#include <errno.h>
43#include <stdlib.h>
44#include <string.h>
45#include <sysexits.h>
46
47#include "mntopts.h"
48
49int getmnt_silent = 0;
50
51void
52getmntopts(options, m0, flagp, altflagp)
53	const char *options;
54	const struct mntopt *m0;
55	int *flagp;
56	int *altflagp;
57{
58	const struct mntopt *m;
59	int negative, len;
60	char *opt, *optbuf, *p;
61	int *thisflagp;
62
63	/* Copy option string, since it is about to be torn asunder... */
64	if ((optbuf = strdup(options)) == NULL)
65		err(1, NULL);
66
67	for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
68		/* Check for "no" prefix. */
69		if (opt[0] == 'n' && opt[1] == 'o') {
70			negative = 1;
71			opt += 2;
72		} else
73			negative = 0;
74
75		/*
76		 * for options with assignments in them (ie. quotas)
77		 * ignore the assignment as it's handled elsewhere
78		 */
79		p = strchr(opt, '=');
80		if (p != NULL)
81			 *++p = '\0';
82
83		/* Scan option table. */
84		for (m = m0; m->m_option != NULL; ++m) {
85			len = strlen(m->m_option);
86			if (strncasecmp(opt, m->m_option, len) == 0)
87				if (opt[len] == '\0' || opt[len] == '=')
88					break;
89		}
90
91		/* Save flag, or fail if option is not recognized. */
92		if (m->m_option) {
93			thisflagp = m->m_altloc ? altflagp : flagp;
94			if (negative == m->m_inverse)
95				*thisflagp |= m->m_flag;
96			else
97				*thisflagp &= ~m->m_flag;
98		} else if (!getmnt_silent) {
99			errx(1, "-o %s: option not supported", opt);
100		}
101	}
102
103	free(optbuf);
104}
105
106void
107rmslashes(rrpin, rrpout)
108	char *rrpin;
109	char *rrpout;
110{
111	char *rrpoutstart;
112
113	*rrpout = *rrpin;
114	for (rrpoutstart = rrpout; *rrpin != '\0'; *rrpout++ = *rrpin++) {
115
116		/* skip all double slashes */
117		while (*rrpin == '/' && *(rrpin + 1) == '/')
118			 rrpin++;
119	}
120
121	/* remove trailing slash if necessary */
122	if (rrpout - rrpoutstart > 1 && *(rrpout - 1) == '/')
123		*(rrpout - 1) = '\0';
124	else
125		*rrpout = '\0';
126}
127
128void
129checkpath(path, resolved)
130	const char *path;
131	char *resolved;
132{
133	struct stat sb;
134
135	if (realpath(path, resolved) != NULL && stat(resolved, &sb) == 0) {
136		if (!S_ISDIR(sb.st_mode))
137			errx(EX_USAGE, "%s: not a directory", resolved);
138	} else
139		errx(EX_USAGE, "%s: %s", resolved, strerror(errno));
140}
141