1/*	$NetBSD: getmntopts.c,v 1.3 2003/08/07 16:44:58 agc Exp $	*/
2
3/*-
4 * Copyright (c) 1994
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33#ifndef lint
34#if 0
35static char sccsid[] = "@(#)getmntopts.c	8.3 (Berkeley) 3/29/95";
36#else
37__RCSID("$NetBSD: getmntopts.c,v 1.3 2003/08/07 16:44:58 agc Exp $");
38#endif
39#endif /* not lint */
40
41#include <sys/param.h>
42#include <sys/mount.h>
43
44#include <err.h>
45#include <errno.h>
46#include <fstab.h>
47#include <stdlib.h>
48#include <string.h>
49
50#include <mntopts.h>
51
52int getmnt_silent = 0;
53
54static const char errmsg[] = "-o %s: option not supported";
55
56struct mntoptparse {
57	const char *options;
58	const struct mntopt *mopts;
59	char *optbuf;
60	char **optarg;
61};
62
63const char *
64getmntoptstr(mntoptparse_t mp, const char *opt)
65{
66	const struct mntopt *m;
67
68	for (m = mp->mopts; m->m_option != NULL; m++)
69		if (strcasecmp(opt, m->m_option) == 0)
70			break;
71
72	if (m->m_option == NULL) {
73		if (getmnt_silent == 0)
74			errx(1, errmsg, opt);
75		else
76			return NULL;
77	}
78
79	return mp->optarg[m - mp->mopts];
80}
81
82long
83getmntoptnum(mntoptparse_t mp, const char *opt)
84{
85	char *ep;
86	long rv;
87	void (*fun)(int, const char *, ...) = NULL;
88	const char *val = getmntoptstr(mp, opt);
89
90	if (val == NULL) {
91		if (getmnt_silent == 0)
92			errx(1, "Missing %s argument", opt);
93		else
94			return -1;
95	}
96
97	errno = 0;
98	rv = strtol(val, &ep, 0);
99
100	if (*ep)
101		fun = errx;
102
103	if (errno == ERANGE && (rv == LONG_MAX || rv == LONG_MIN))
104		fun = err;
105
106	if (fun) {
107		if (getmnt_silent != 0)
108			return -1;
109		(*fun)(1, "Invalid %s argument `%s'", opt, val);
110	}
111	return rv;
112}
113
114void
115freemntopts(mntoptparse_t mp)
116{
117	free(mp->optbuf);
118	free(mp->optarg);
119	free(mp);
120}
121
122mntoptparse_t
123getmntopts(const char *options, const struct mntopt *m0, int *flagp,
124    int *altflagp)
125{
126	const struct mntopt *m;
127	int negative;
128	char *opt, *p;
129	int *thisflagp;
130	size_t nopts;
131	mntoptparse_t mp;
132
133	for (nopts = 0, m = m0; m->m_option != NULL; ++m, nopts++)
134		continue;
135
136	if ((mp = malloc(sizeof(struct mntoptparse))) == NULL)
137		return NULL;
138
139	/* Copy option string, since it is about to be torn asunder... */
140	if ((mp->optbuf = strdup(options)) == NULL) {
141		free(mp);
142		return NULL;
143	}
144
145	if ((mp->optarg = calloc(nopts, sizeof(char *))) == NULL) {
146		free(mp->optbuf);
147		free(mp);
148		return NULL;
149	}
150
151	mp->mopts = m0;
152	mp->options = options;
153
154	for (opt = mp->optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
155		/* Check for "no" prefix. */
156		if (opt[0] == 'n' && opt[1] == 'o') {
157			negative = 1;
158			opt += 2;
159		} else
160			negative = 0;
161
162		/*
163		 * for options with assignments in them (ie. quotas)
164		 * ignore the assignment as it's handled elsewhere
165		 */
166		p = strchr(opt, '=');
167		if (p) {
168			 *p++ = '\0';
169		}
170
171		/* Scan option table. */
172		for (m = m0; m->m_option != NULL; ++m)
173			if (strcasecmp(opt, m->m_option) == 0)
174				break;
175
176		/* Save flag, or fail if option is not recognised. */
177		if (m->m_option) {
178			mp->optarg[m - m0] = p;
179			thisflagp = m->m_altloc ? altflagp : flagp;
180			if (negative == m->m_inverse)
181				*thisflagp |= m->m_flag;
182			else
183				*thisflagp &= ~m->m_flag;
184		} else if (!getmnt_silent) {
185			errx(1, errmsg, opt);
186		} else {
187			free(mp->optbuf);
188			free(mp);
189
190			return NULL;
191		}
192	}
193	return mp;
194}
195