minix/lib/libutil/getmntopts.c

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/* $NetBSD: getmntopts.c,v 1.4 2007/08/26 22:46:15 pooka 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/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)getmntopts.c 8.3 (Berkeley) 3/29/95";
#else
__RCSID("$NetBSD: getmntopts.c,v 1.4 2007/08/26 22:46:15 pooka Exp $");
#endif
#endif /* not lint */
#include <sys/param.h>
#include <sys/mount.h>
#include <err.h>
#include <errno.h>
#include <fstab.h>
#include <stdlib.h>
#include <string.h>
#include <mntopts.h>
int getmnt_silent = 0;
static const char errmsg[] = "-o %s: option not supported";
struct mntoptparse {
const char *options;
const struct mntopt *mopts;
char *optbuf;
char **optarg;
};
const char *
getmntoptstr(mntoptparse_t mp, const char *opt)
{
const struct mntopt *m;
for (m = mp->mopts; m->m_option != NULL; m++)
if (strcasecmp(opt, m->m_option) == 0)
break;
if (m->m_option == NULL) {
if (getmnt_silent == 0)
errx(1, errmsg, opt);
else
return NULL;
}
return mp->optarg[m - mp->mopts];
}
long
getmntoptnum(mntoptparse_t mp, const char *opt)
{
char *ep;
long rv;
void (*fun)(int, const char *, ...) = NULL;
const char *val = getmntoptstr(mp, opt);
if (val == NULL) {
if (getmnt_silent == 0)
errx(1, "Missing %s argument", opt);
else
return -1;
}
errno = 0;
rv = strtol(val, &ep, 0);
if (*ep)
fun = errx;
if (errno == ERANGE && (rv == LONG_MAX || rv == LONG_MIN))
fun = err;
if (fun) {
if (getmnt_silent != 0)
return -1;
(*fun)(1, "Invalid %s argument `%s'", opt, val);
}
return rv;
}
void
freemntopts(mntoptparse_t mp)
{
free(mp->optbuf);
free(mp->optarg);
free(mp);
}
mntoptparse_t
getmntopts(const char *options, const struct mntopt *m0, int *flagp,
int *altflagp)
{
const struct mntopt *m;
int negative;
char *opt, *p;
int *thisflagp;
size_t nopts;
mntoptparse_t mp;
for (nopts = 0, m = m0; m->m_option != NULL; ++m, nopts++)
continue;
if ((mp = malloc(sizeof(struct mntoptparse))) == NULL)
return NULL;
/* Copy option string, since it is about to be torn asunder... */
if ((mp->optbuf = strdup(options)) == NULL) {
free(mp);
return NULL;
}
if ((mp->optarg = calloc(nopts, sizeof(char *))) == NULL) {
free(mp->optbuf);
free(mp);
return NULL;
}
mp->mopts = m0;
mp->options = options;
for (opt = mp->optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
/* Check for "no" prefix. */
if (opt[0] == 'n' && opt[1] == 'o') {
negative = 1;
opt += 2;
} else
negative = 0;
/*
* for options with assignments in them (ie. quotas)
* ignore the assignment as it's handled elsewhere
*/
p = strchr(opt, '=');
if (p) {
*p++ = '\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) {
mp->optarg[m - m0] = p;
thisflagp = m->m_altloc ? altflagp : flagp;
if (negative == m->m_inverse)
*thisflagp |= m->m_flag;
else
*thisflagp &= ~m->m_flag;
} else if (!getmnt_silent) {
errx(1, errmsg, opt);
} else {
free(mp->optbuf);
free(mp);
return NULL;
}
}
return mp;
}