/*
 * Copyright (c) 1989, 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * @(#) Copyright (c) 1989, 1993 The Regents of the University of California.  All rights reserved.
 * @(#)calendar.c  8.3 (Berkeley) 3/25/94
 * $FreeBSD: src/usr.bin/calendar/calendar.c,v 1.11.2.5 2003/04/06 20:04:56 dwmalone Exp $
 * $DragonFly: src/usr.bin/calendar/calendar.c,v 1.5 2007/09/24 20:49:09 pavalos Exp $
 */

#include <err.h>
#include <errno.h>
#include <locale.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <sysexits.h>
#include <time.h>
#include <unistd.h>

#include "pathnames.h"
#include "calendar.h"

struct passwd *pw;
int doall = 0;
int f_dayAfter = 0; /* days after current date */
int f_dayBefore = 0; /* days before current date */
int Friday = 5;	     /* day before weekend */

static void	usage(void);

int
main(int argc, char **argv)
{
	int ch;
	time_t f_time = 0;

	setlocale(LC_ALL, "");

	while ((ch = getopt(argc, argv, "-af:t:A:B:F:W:")) != -1) {
		switch (ch) {
		case '-':		/* backward compatible */
		case 'a':
			if (getuid()) {
				errno = EPERM;
				err(EXIT_FAILURE, NULL);
			}
			doall = 1;
			break;
			
		case 'f': /* other calendar file */
		        calendarFile = optarg;
			break;

		case 't': /* other date, undocumented, for tests */
			f_time = Mktime(optarg);
			break;

		case 'W': /* we don't need no steenking Fridays */
			Friday = -1;

			/* FALLTHROUGH */			
		case 'A': /* days after current date */
			f_dayAfter = atoi(optarg);
			break;

		case 'B': /* days before current date */
			f_dayBefore = atoi(optarg); 
			break;

		case 'F':
			Friday = atoi(optarg);
			break;

		case '?':
		default:
			usage();
		}
	}
	argc -= optind;
	argv += optind;

	if (argc)
		usage();

	/* use current time */
	if (f_time <= 0) 
	    time(&f_time);

	settime(f_time);
	
	if (doall)
		while ((pw = getpwent()) != NULL) {
			setegid(pw->pw_gid);
			initgroups(pw->pw_name, pw->pw_gid);
			seteuid(pw->pw_uid);
			if (!chdir(pw->pw_dir))
				cal();
			seteuid(0);
		}
	else
		cal();
	exit(EX_OK);
}


static void
usage(void)
{
	fprintf(stderr, "%s\n%s\n",
	    "usage: calendar [-a] [-A days] [-B days] [-F friday] "
	    "[-f calendarfile]",
	    "                [-t dd[.mm[.year]]] [-W days]");
	exit(EX_USAGE);
}