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File: [cvs.NetBSD.org] / src / lib / libutil / getmntopts.c (download)

Revision 1.4, Sun Aug 26 22:46:15 2007 UTC (12 years, 7 months ago) by pooka
Branch: MAIN
CVS Tags: yamt-pf42-baseX, yamt-pf42-base4, yamt-pf42-base3, yamt-pf42-base2, yamt-pf42-base, yamt-pf42, yamt-pagecache-tag8, yamt-pagecache-base9, yamt-pagecache-base8, yamt-pagecache-base7, yamt-pagecache-base6, yamt-pagecache-base5, yamt-pagecache-base4, yamt-pagecache-base3, yamt-pagecache-base2, yamt-pagecache-base, yamt-pagecache, wrstuden-revivesa-base-3, wrstuden-revivesa-base-2, wrstuden-revivesa-base-1, wrstuden-revivesa-base, wrstuden-revivesa, tls-maxphys-base, tls-maxphys, tls-earlyentropy-base, tls-earlyentropy, riastradh-xf86-video-intel-2-7-1-pre-2-21-15, riastradh-drm2-base3, riastradh-drm2-base2, riastradh-drm2-base1, riastradh-drm2-base, riastradh-drm2, prg-localcount2-base3, prg-localcount2-base2, prg-localcount2-base1, prg-localcount2-base, prg-localcount2, phil-wifi-base, phil-wifi-20191119, phil-wifi-20190609, phil-wifi, pgoyette-localcount-base, pgoyette-localcount-20170426, pgoyette-localcount-20170320, pgoyette-localcount-20170107, pgoyette-localcount-20161104, pgoyette-localcount-20160806, pgoyette-localcount-20160726, pgoyette-localcount, pgoyette-compat-merge-20190127, pgoyette-compat-base, pgoyette-compat-20190127, pgoyette-compat-20190118, pgoyette-compat-1226, pgoyette-compat-1126, pgoyette-compat-1020, pgoyette-compat-0930, pgoyette-compat-0906, pgoyette-compat-0728, pgoyette-compat-0625, pgoyette-compat-0521, pgoyette-compat-0502, pgoyette-compat-0422, pgoyette-compat-0415, pgoyette-compat-0407, pgoyette-compat-0330, pgoyette-compat-0322, pgoyette-compat-0315, pgoyette-compat, perseant-stdc-iso10646-base, perseant-stdc-iso10646, netbsd-9-base, netbsd-9-0-RELEASE, netbsd-9-0-RC2, netbsd-9-0-RC1, netbsd-9, netbsd-8-base, netbsd-8-2-RELEASE, netbsd-8-1-RELEASE, netbsd-8-1-RC1, netbsd-8-0-RELEASE, netbsd-8-0-RC2, netbsd-8-0-RC1, netbsd-8, netbsd-7-nhusb-base-20170116, netbsd-7-nhusb-base, netbsd-7-nhusb, netbsd-7-base, netbsd-7-2-RELEASE, netbsd-7-1-RELEASE, netbsd-7-1-RC2, netbsd-7-1-RC1, netbsd-7-1-2-RELEASE, netbsd-7-1-1-RELEASE, netbsd-7-1, netbsd-7-0-RELEASE, netbsd-7-0-RC3, netbsd-7-0-RC2, netbsd-7-0-RC1, netbsd-7-0-2-RELEASE, netbsd-7-0-1-RELEASE, netbsd-7-0, netbsd-7, netbsd-6-base, netbsd-6-1-RELEASE, netbsd-6-1-RC4, netbsd-6-1-RC3, netbsd-6-1-RC2, netbsd-6-1-RC1, netbsd-6-1-5-RELEASE, netbsd-6-1-4-RELEASE, netbsd-6-1-3-RELEASE, netbsd-6-1-2-RELEASE, netbsd-6-1-1-RELEASE, netbsd-6-1, netbsd-6-0-RELEASE, netbsd-6-0-RC2, netbsd-6-0-RC1, netbsd-6-0-6-RELEASE, netbsd-6-0-5-RELEASE, netbsd-6-0-4-RELEASE, netbsd-6-0-3-RELEASE, netbsd-6-0-2-RELEASE, netbsd-6-0-1-RELEASE, netbsd-6-0, netbsd-6, netbsd-5-base, netbsd-5-2-RELEASE, netbsd-5-2-RC1, netbsd-5-2-3-RELEASE, netbsd-5-2-2-RELEASE, netbsd-5-2-1-RELEASE, netbsd-5-2, netbsd-5-1-RELEASE, netbsd-5-1-RC4, netbsd-5-1-RC3, netbsd-5-1-RC2, netbsd-5-1-RC1, netbsd-5-1-5-RELEASE, netbsd-5-1-4-RELEASE, netbsd-5-1-3-RELEASE, netbsd-5-1-2-RELEASE, netbsd-5-1-1-RELEASE, netbsd-5-1, netbsd-5-0-RELEASE, netbsd-5-0-RC4, netbsd-5-0-RC3, netbsd-5-0-RC2, netbsd-5-0-RC1, netbsd-5-0-2-RELEASE, netbsd-5-0-1-RELEASE, netbsd-5-0, netbsd-5, mjf-devfs2-base, mjf-devfs2, matt-premerge-20091211, matt-nb8-mediatek-base, matt-nb8-mediatek, matt-nb6-plus-nbase, matt-nb6-plus-base, matt-nb6-plus, matt-nb5-pq3-base, matt-nb5-pq3, matt-nb5-mips64-u2-k2-k4-k7-k8-k9, matt-nb5-mips64-u1-k1-k5, matt-nb5-mips64-premerge-20101231, matt-nb5-mips64-premerge-20091211, matt-nb5-mips64-k15, matt-nb5-mips64, matt-nb4-mips64-k7-u2a-k9b, matt-mips64-premerge-20101231, matt-mips64-base2, matt-armv6-prevmlocking, matt-armv6-nbase, matt-armv6-base, matt-armv6, localcount-20160914, keiichi-mipv6-base, keiichi-mipv6, jym-xensuspend-nbase, jym-xensuspend-base, jym-xensuspend, hpcarm-cleanup-nbase, hpcarm-cleanup-base, cube-autoconf-base, cube-autoconf, christos-time_t-base, christos-time_t, cherry-xenmp-base, cherry-xenmp, bouyer-socketcan-base1, bouyer-socketcan-base, bouyer-socketcan, bouyer-quota2-nbase, bouyer-quota2-base, bouyer-quota2, agc-symver-base, agc-symver, HEAD
Changes since 1.3: +7 -2 lines

Emulate behaviour described in man page and return NULL if an error occurs.

/*	$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;
}