lib/class/getclass.c

	getclass.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * 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 1997 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"    /* SVr4.0 1.9   */
/* EMACS_MODES: !fill, lnumb, !overwrite, !nodelete, !picture */

#include "stdio.h"
#include "string.h"
#include "errno.h"
#include "sys/types.h"

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

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

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

    static CLASS        clsbuf;

    char            *file,
                buf[BUFSIZ];

    int fd;


    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);

    if (!(clsbuf.name = Strdup(name))) {
        close(fd);
        errno = ENOMEM;
        return (0);
    }

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

        freelist (clsbuf.members);
        Free (clsbuf.name);
        close(fd);
        errno = save_errno;
        return (0);
    }
    close(fd);

    if (!clsbuf.members) {
        Free (clsbuf.name);
        errno = EBADF;
        return (0);
    }

    return (&clsbuf);
}