128 lines
3.8 KiB
C
128 lines
3.8 KiB
C
/* $OpenBSD: getmntopts.c,v 1.13 2019/06/28 13:32:44 deraadt Exp $ */
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/* $NetBSD: getmntopts.c,v 1.3 1995/03/18 14:56:58 cgd Exp $ */
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/*-
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* Copyright (c) 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <sys/mount.h>
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#include <err.h>
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#include <errno.h>
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#include <fstab.h>
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#include <stdlib.h>
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#include <string.h>
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#include <limits.h>
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#include "mntopts.h"
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int
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getmntopts(const char *optionp, const struct mntopt *m0, int *flagp)
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{
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char *p, *q;
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union mntval val;
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int ret = 0;
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p = q = strdup(optionp);
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if (p == NULL)
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err(1, NULL);
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while (p != NULL) {
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ret |= getmntopt(&p, &val, m0, flagp);
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}
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free(q);
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return (ret);
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}
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int
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getmntopt(char **optionp, union mntval *valuep, const struct mntopt *m0,
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int *flagp)
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{
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const struct mntopt *m;
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char *opt, *value, *endp;
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long l;
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int inverse, negative, needval, ret = 0;
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/* Pull out the next option. */
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do {
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if (*optionp == NULL)
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return (0);
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opt = strsep(optionp, ",");
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} while (opt == NULL || *opt == '\0');
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/* Check for "no" prefix. */
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if (opt[0] == 'n' && opt[1] == 'o') {
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negative = 1;
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opt += 2;
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} else
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negative = 0;
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/* Stash the value for options with assignments in them. */
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if ((value = strchr(opt, '=')) != NULL)
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*value++ = '\0';
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/* Scan option table. */
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for (m = m0; m->m_option != NULL; ++m)
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if (strcasecmp(opt, m->m_option) == 0)
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break;
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/* Save flag, or fail if option is not recognised. */
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if (m->m_option) {
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needval = (m->m_oflags & (MFLAG_INTVAL|MFLAG_STRVAL)) != 0;
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if (needval != (value != NULL) && !(m->m_oflags & MFLAG_OPT))
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errx(1, "-o %s: option %s a value", opt,
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needval ? "needs" : "does not need");
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inverse = (m->m_oflags & MFLAG_INVERSE) ? 1 : 0;
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if (m->m_oflags & MFLAG_SET) {
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if (negative == inverse)
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*flagp |= m->m_flag;
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else
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*flagp &= ~m->m_flag;
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}
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else if (negative == inverse)
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ret = m->m_flag;
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} else
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errx(1, "-o %s: option not supported", opt);
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/* Store the value for options with assignments in them. */
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if (value != NULL) {
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if (m->m_oflags & MFLAG_INTVAL) {
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errno = 0;
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l = strtol(value, &endp, 10);
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if (endp == value || l == -1 || l > INT_MAX ||
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(l == LONG_MAX && errno == ERANGE))
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errx(1, "%s: illegal value '%s'",
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opt, value);
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valuep->ival = (int)l;
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} else
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valuep->strval = value;
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} else
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memset(valuep, 0, sizeof(*valuep));
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return (ret);
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}
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