gen/common/fstab.c

	fstab.c revision 5d54f3d8999eac1762fe0a8c7177d20f1f201fae
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 1990 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include <fstab.h>
#include <stdio.h>
#include <ctype.h>
#include <mntent.h>

static  struct fstab *pfs;
static  FILE *fs_file;

static int
fstabscan(struct fstab *fs)
{
    struct mntent *mnt;

    /* skip over all filesystem types except '4.2', 'swap' & 'ignore' */
    while (((mnt = getmntent(fs_file)) != NULL) &&
        !((strcmp(mnt->mnt_type, MNTTYPE_42) == 0) ||
          (strcmp(mnt->mnt_type, MNTTYPE_SWAP) == 0) ||
          (strcmp(mnt->mnt_type, MNTTYPE_IGNORE) == 0)))
                continue;
    if (mnt == NULL)
        return (EOF);
    fs->fs_spec = mnt->mnt_fsname;
    fs->fs_file = mnt->mnt_dir;
    if (strcmp(mnt->mnt_type, MNTTYPE_IGNORE) == 0) {
        strcpy(mnt->mnt_opts, FSTAB_XX);
    } else if (strcmp(mnt->mnt_type, MNTTYPE_SWAP) == 0) {
        strcpy(mnt->mnt_opts, FSTAB_SW);
    } else if (hasmntopt(mnt, MNTOPT_RO)) {
        strcpy(mnt->mnt_opts, FSTAB_RO);
    } else if (hasmntopt(mnt, MNTOPT_QUOTA)) {
        strcpy(mnt->mnt_opts, FSTAB_RQ);
    } else {
        strcpy(mnt->mnt_opts, FSTAB_RW);
    }
    fs->fs_type = mnt->mnt_opts;
    fs->fs_freq = mnt->mnt_freq;
    fs->fs_passno = mnt->mnt_passno;
    return (5);
}

int
setfsent(void)
{

    if (fs_file)
        endfsent();
    if ((fs_file = setmntent(FSTAB, "r")) == NULL) {
        fs_file = 0;
        return (0);
    }
    return (1);
}

int
endfsent(void)
{

    if (fs_file) {
        endmntent(fs_file);
        fs_file = 0;
    }
    return (1);
}

struct fstab *
getfsent(void)
{
    int nfields;

    if ((fs_file == 0) && (setfsent() == 0))
        return ((struct fstab *)0);
    if (pfs == 0) {
        pfs = (struct fstab *)malloc(sizeof (struct fstab));
        if (pfs == 0)
            return (0);
    }
    nfields = fstabscan(pfs);
    if (nfields == EOF || nfields != 5)
        return ((struct fstab *)0);
    return (pfs);
}

struct fstab *
getfsspec(char *name)
{
    struct fstab *fsp;

    if (setfsent() == 0)    /* start from the beginning */
        return ((struct fstab *)0);
    while((fsp = getfsent()) != 0)
        if (strcmp(fsp->fs_spec, name) == 0)
            return (fsp);
    return ((struct fstab *)0);
}

struct fstab *
getfsfile(char *name)
{
    struct fstab *fsp;

    if (setfsent() == 0)    /* start from the beginning */
        return ((struct fstab *)0);
    while ((fsp = getfsent()) != 0)
        if (strcmp(fsp->fs_file, name) == 0)
            return (fsp);
    return ((struct fstab *)0);
}

struct fstab *
getfstype(char *type)
{
    struct fstab *fs;

    if (setfsent() == 0)
        return ((struct fstab *)0);
    while ((fs = getfsent()) != 0)
        if (strcmp(fs->fs_type, type) == 0)
            return (fs);
    return ((struct fstab *)0);
}