/*
 * $QNXtpLicenseC:
 * Copyright 2007, QNX Software Systems. All Rights Reserved.
 * 
 * You must obtain a written license from and pay applicable license fees to QNX 
 * Software Systems before you may reproduce, modify or distribute this software, 
 * or any work that includes all or part of this software.   Free development 
 * licenses are available for evaluation and non-commercial purposes.  For more 
 * information visit http://licensing.qnx.com or email licensing@qnx.com.
 *  
 * This file may contain contributions from others.  Please review this entire 
 * file for other proprietary rights or license notices, as well as the QNX 
 * Development Suite License Guide at http://licensing.qnx.com/license-guide/ 
 * for other information.
 * $
 */





/*	$NetBSD: fstab.c,v 1.16 1998/10/16 11:24:30 kleink Exp $	*/

/*
 * Copyright (c) 1980, 1988, 1993
 *	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. 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.
 */

#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)fstab.c	8.1 (Berkeley) 6/4/93";
#else
__RCSID("$NetBSD: fstab.c,v 1.16 1998/10/16 11:24:30 kleink Exp $");
#endif
#endif /* LIBC_SCCS and not lint */

#include <sys/types.h>
#include <sys/uio.h>
#include <err.h>
#include <errno.h>
#include <fstab.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#ifndef __QNXNTO__
#include "namespace.h"
#else
#include <sys/mount.h>
#endif

static FILE *_fs_fp;
static struct fstab _fs_fstab;

static void error(int);
static int fstabscan(void);

static int
fstabscan(void)
{
	char *cp;
#define	MAXLINELENGTH	1024
	static char line[MAXLINELENGTH];
	char subline[MAXLINELENGTH];
	int typexx;
	char *lastp;
	static const char ws[] = " \t\n";

	for (;;) {
		if (!(cp = fgets(line, sizeof(line), _fs_fp)))
			return(0);

		_fs_fstab.fs_spec = strtok_r(cp, ws, &lastp);
		if (!_fs_fstab.fs_spec || *_fs_fstab.fs_spec == '#')
			continue;
		_fs_fstab.fs_file = strtok_r(NULL, ws, &lastp);
		_fs_fstab.fs_vfstype = strtok_r(NULL, ws, &lastp);
		_fs_fstab.fs_mntops = strtok_r(NULL, ws, &lastp);
		if (_fs_fstab.fs_mntops == NULL)
			goto bad;

		_fs_fstab.init_flags = 0;
		_fs_fstab.init_mask = _MFLAG_OCB;
		_fs_fstab.fs_type = NULL;

		(void)strncpy(subline, _fs_fstab.fs_mntops, sizeof(subline)-1);
		for (typexx = 0, cp = strtok_r(subline, ",", &lastp); cp;
			cp = strtok_r((char *)NULL, ",", &lastp)) {
			if (!strcmp(cp, FSTAB_OCB)) {
				_fs_fstab.init_flags |= _MFLAG_OCB;
				_fs_fstab.init_mask &= ~_MFLAG_OCB;
			} else if (!strcmp(cp, FSTAB_IMPLIED)) {
				_fs_fstab.init_flags |= _MOUNT_IMPLIED;
				_fs_fstab.init_mask &= ~_MOUNT_IMPLIED;
			} else if (!strcmp(cp, FSTAB_RW)) {
				_fs_fstab.fs_type = FSTAB_RW;
			} else if (!strcmp(cp, FSTAB_RO)) {
				_fs_fstab.fs_type = FSTAB_RO;
			} else if (!strcmp(cp, FSTAB_XX)) {
				_fs_fstab.fs_type = FSTAB_XX;
				typexx++;
			}
		}
		if (typexx)
			continue;
		if (_fs_fstab.fs_type != NULL)
			return(1);

bad:		/* no way to distinguish between EOF and syntax error */
		error(ENOENT);
	}
	/* NOTREACHED */
}

struct fstab *
getfsent(void)
{
	if ((!_fs_fp && !setfsent()) || !fstabscan())
		return((struct fstab *)NULL);
	return &_fs_fstab;
}

struct fstab *
getfsspec(const char *name)
{
	if (setfsent())
		while (fstabscan())
			if (!strcmp(_fs_fstab.fs_spec, name))
				return &_fs_fstab;
	return (struct fstab *)NULL;
}

struct fstab *
getfsfile(const char *name)
{
	if (setfsent())
		while (fstabscan())
			if (!strcmp(_fs_fstab.fs_file, name))
				return &_fs_fstab;
	return (struct fstab *)NULL;
}

int
setfsent(void)
{
	if (_fs_fp) {
		rewind(_fs_fp);
		return 1;
	}
	if ((_fs_fp = fopen(_PATH_FSTAB, "r")) != NULL) {
		return 1;
	}

	error(errno);
	return 0;
}

void
endfsent(void)
{
	if (_fs_fp) {
		(void)fclose(_fs_fp);
		_fs_fp = NULL;
	}
}
static void
error(int err)
{
	errno = err;
}
