/*
 * 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 (c) 1983-2000 by Sun Microsystems, Inc.
 * All rights reserved.
 */

#include <sys/acctctl.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>

#include "lastcomm.h"

int
main(int argc, char *argv[])
{
        int res;
        int opt;
        char *filename = NULL;
        char buf[PATH_MAX];
        ea_file_t ef;
        int xflag = 0;

        while ((opt = getopt(argc, argv, "f:x")) != EOF) {
                switch (opt) {
                case 'f':
                        filename = optarg;
                        break;
                case 'x':
                        xflag = 1;
                        break;
                default:
                        (void) fprintf(stderr,
                            gettext("Usage:\tlastcomm [-x] [-f filename]"
                            " [command] ... [user] ... [terminal] ...\n"));
                        exit(2);
                }
        }

        if (xflag) {
                /*
                 * User wants to see extended accounting statistics.
                 */
                if (filename) {
                        return (lc_exacct(filename, argc, argv, optind));
                } else {
                        if (acctctl(AC_PROC | AC_FILE_GET, buf, PATH_MAX) < 0) {
                                (void) fprintf(stderr, gettext("lastcomm: "
                                    "cannot open extended accounting file: "
                                    "%s\n"), strerror(errno));
                                return (1);
                        } else {
                                return (lc_exacct(buf, argc, argv, optind));
                        }
                }
        }
        if (filename == NULL) {
                /*
                 * If no option is specified, then first try to open current
                 * extended process accounting file and then old-style process
                 * accounting.
                 */
                if (acctctl(AC_PROC | AC_FILE_GET, buf, PATH_MAX) < 0)
                        return (lc_pacct("/var/adm/pacct", argc, argv, optind));
                else
                        return (lc_exacct(buf, argc, argv, optind));
        } else {
                /*
                 * If accounting file was specified and we don't know its
                 * format, then first try to open it as an extended accounting
                 * file and then as an old-style accounting file.
                 */
                if ((res = ea_open(&ef, filename, EXACCT_CREATOR,
                    EO_TAIL | EO_VALID_HDR, O_RDONLY, 0)) >= 0)
                        (void) ea_close(&ef);

                if (res < 0)
                        return (lc_pacct(filename, argc, argv, optind));
                else
                        return (lc_exacct(filename, argc, argv, optind));
        }
}