/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (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 2006 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/*        All Rights Reserved   */

/* EMACS_MODES: !fill, lnumb, !overwrite, !nodelete, !picture */

#include "stdio.h"
#include "string.h"
#include "errno.h"
#include "sys/types.h"
#include <syslog.h>

#include "lp.h"
#include "class.h"

/**
 ** getclass() - READ CLASS FROM TO DISK
 **/

CLASS *
getclass(char *name)
{
        static long             lastdir         = -1;

        CLASS           *clsp;

        char                    *file,
                                buf[BUFSIZ];

        int fd;

        syslog(LOG_DEBUG, "getclass(%s)", name ? name : "");

        if (!name || !*name) {
                errno = EINVAL;
                return (0);
        }

        /*
         * Getting ``all''? If so, jump into the directory
         * wherever we left off.
         */
        if (STREQU(NAME_ALL, name)) {
                if (!(name = next_file(Lp_A_Classes, &lastdir)))
                        return (0);
        } else
                lastdir = -1;

        /*
         * Get the class list.
         */

        if (!(file = getclassfile(name)))
                return (0);

        if ((fd = open_locked(file, "r", 0)) < 0) {
                Free (file);
                return (0);
        }
        Free (file);

        clsp = (CLASS *)calloc(sizeof (*clsp), 1);

        if (!(clsp->name = Strdup(name))) {
                Free (clsp);
                close(fd);
                errno = ENOMEM;
                return (0);
        }

        clsp->members = 0;
        errno = 0;
        while (fdgets(buf, BUFSIZ, fd)) {
                buf[strlen(buf) - 1] = 0;
                addlist (&clsp->members, buf);
        }
        if (errno != 0) {
                int                     save_errno = errno;

                freelist (clsp->members);
                Free (clsp->name);
                Free (clsp);
                close(fd);
                errno = save_errno;
                return (0);
        }
        close(fd);

        if (!clsp->members) {
                Free (clsp->name);
                Free (clsp);
                errno = EBADF;
                return (0);
        }

        return (clsp);
}