lib/class/getclass.c

	getclass.c revision 0a44ef6d9afbfe052a7e975f55ea0d2954b62a82
/*
 * 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   */


#pragma ident   "%Z%%M% %I% %E% SMI"
/* 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);
}