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/* $OpenBSD: getmntopts.c,v 1.12 2015/01/16 06:39:59 deraadt Exp $ */
/* $NetBSD: getmntopts.c,v 1.3 1995/03/18 14:56:58 cgd Exp $ */
/*-
* Copyright (c) 1994
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/mount.h>
#include <err.h>
#include <errno.h>
#include <fstab.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include "mntopts.h"
int
getmntopts(const char *optionp, const struct mntopt *m0, int *flagp)
{
char *p, *q;
union mntval val;
int ret = 0;
p = q = strdup(optionp);
if (p == NULL)
err(1, NULL);
while (p != NULL) {
ret |= getmntopt(&p, &val, m0, flagp);
}
free(q);
return (ret);
}
int
getmntopt(char **optionp, union mntval *valuep, const struct mntopt *m0,
int *flagp)
{
const struct mntopt *m;
char *opt, *value, *endp;
long l;
int inverse, negative, needval, ret = 0;
/* Pull out the next option. */
do {
if (*optionp == NULL)
return (0);
opt = strsep(optionp, ",");
} while (opt == NULL || *opt == '\0');
/* Check for "no" prefix. */
if (opt[0] == 'n' && opt[1] == 'o') {
negative = 1;
opt += 2;
} else
negative = 0;
/* Stash the value for options with assignments in them. */
if ((value = strchr(opt, '=')) != NULL)
*value++ = '\0';
/* Scan option table. */
for (m = m0; m->m_option != NULL; ++m)
if (strcasecmp(opt, m->m_option) == 0)
break;
/* Save flag, or fail if option is not recognised. */
if (m->m_option) {
needval = (m->m_oflags & (MFLAG_INTVAL|MFLAG_STRVAL)) != 0;
if (needval != (value != NULL) && !(m->m_oflags & MFLAG_OPT))
errx(1, "-o %s: option %s a value", opt,
needval ? "needs" : "does not need");
inverse = (m->m_oflags & MFLAG_INVERSE) ? 1 : 0;
if (m->m_oflags & MFLAG_SET) {
if (negative == inverse)
*flagp |= m->m_flag;
else
*flagp &= ~m->m_flag;
}
else if (negative == inverse)
ret = m->m_flag;
} else
errx(1, "-o %s: option not supported", opt);
/* Store the value for options with assignments in them. */
if (value != NULL) {
if (m->m_oflags & MFLAG_INTVAL) {
errno = 0;
l = strtol(value, &endp, 10);
if (endp == value || l < 0 || l > INT_MAX ||
(l == LONG_MAX && errno == ERANGE))
errx(1, "%s: illegal value '%s'",
opt, value);
valuep->ival = (int)l;
} else
valuep->strval = value;
} else
memset(valuep, 0, sizeof(*valuep));
return (ret);
}
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