File: mntent.c

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/*
 * Copyright (c) 1980, 1989, 1993, 1994
 *      The Regents of the University of California.  All rights reserved.
 * Copyright (c) 2001
 *      David Rufino <daverufino@btinternet.com>
 * Copyright (c) 2013
 *      xaizek <xaizek@posteo.net>
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. 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.
 */

/* Most of this was ripped from the mount(3) source. */

#include "mntent.h"

#if (!defined(HAVE_MNTENT_H) || !HAVE_MNTENT_H) && \
    defined(HAVE_GETMNTINFO) && HAVE_GETMNTINFO

#include <sys/param.h>
#include <sys/ucred.h>
#include <sys/mount.h>

#include <stdlib.h>
#include <string.h>

#ifdef __NetBSD__
#define statfs statvfs
#define f_flags f_flag
#endif

static struct mntent * statfs_to_mntent(struct statfs *mntbuf);
static char * flags2opts(int flags);
static char * catopt(char s0[], const char s1[]);

char *
hasmntopt(const struct mntent *mnt, const char option[])
{
	char *opt, *optbuf;

	optbuf = strdup(mnt->mnt_opts);
	for(opt = optbuf; (opt = strtok(opt, " ")) != NULL; opt = NULL)
	{
		if(!strcasecmp(opt, option))
		{
			opt = opt - optbuf + mnt->mnt_opts;
			free(optbuf);
			return (opt);
		}
	}
	free(optbuf);
	return NULL;
}

struct mntent *
getmntent(FILE *fp)
{
	static int pos = -1;
	static int mntsize = -1;

	static struct statfs *mntbuf;

	if(pos == -1 || mntsize == -1)
	{
		mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
	}

	pos++;
	if(pos == mntsize)
	{
		pos = mntsize = -1;
		return NULL;
	}

	return statfs_to_mntent(&mntbuf[pos]);
}

static struct mntent *
statfs_to_mntent(struct statfs *mntbuf)
{
	static struct mntent _mntent;
	static char opts_buf[40], *tmp;

	_mntent.mnt_fsname = mntbuf->f_mntfromname;
	_mntent.mnt_dir = mntbuf->f_mntonname;
	_mntent.mnt_type = mntbuf->f_fstypename;
	tmp = flags2opts (mntbuf->f_flags);
	if(tmp != NULL)
	{
		opts_buf[sizeof(opts_buf) - 1] = '\0';
		strncpy(opts_buf, tmp, sizeof(opts_buf) - 1);
		free(tmp);
	}
	else
	{
		*opts_buf = '\0';
	}
	_mntent.mnt_opts = opts_buf;
	_mntent.mnt_freq = _mntent.mnt_passno = 0;
	return &_mntent;
}

static char *
flags2opts(int flags)
{
	char *res = catopt(NULL, (flags & MNT_RDONLY) ? "ro" : "rw");
	if(flags & MNT_SYNCHRONOUS) res = catopt(res, "sync");
	if(flags & MNT_NOEXEC)      res = catopt(res, "noexec");
	if(flags & MNT_NOSUID)      res = catopt(res, "nosuid");
#ifndef __OpenBSD__
	if(flags & MNT_UNION)       res = catopt(res, "union");
#endif
	if(flags & MNT_ASYNC)       res = catopt(res, "async");
	if(flags & MNT_NOATIME)     res = catopt(res, "noatime");
#if !defined(__APPLE__) && !defined(__OpenBSD__) && !defined(__NetBSD__)
	if(flags & MNT_NOCLUSTERR)  res = catopt(res, "noclusterr");
	if(flags & MNT_NOCLUSTERW)  res = catopt(res, "noclusterw");
	if(flags & MNT_NOSYMFOLLOW) res = catopt(res, "nosymfollow");
	if(flags & MNT_SUIDDIR)     res = catopt(res, "suiddir");
#endif

	return res;
}

static char *
catopt(char s0[], const char s1[])
{
	char *cp;

	if(s1 == NULL || *s1 == '\0')
	{
		return s0;
	}
	if(s0 && *s0)
	{
		const size_t i = strlen(s0) + strlen(s1) + 1 + 1;
		if((cp = malloc(i)) == NULL)
		{
			return NULL;
		}
		(void)snprintf(cp, i, "%s %s", s0, s1);
	}
	else
	{
		cp = strdup(s1);
	}

	free(s0);
	return cp;
}

#endif /* HAVE_MNTENT_H */

/* vim: set tabstop=2 softtabstop=2 shiftwidth=2 noexpandtab cinoptions-=(0 : */
/* vim: set cinoptions+=t0 filetype=c : */