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warnx?/errx? paranoia (use "%s" not a bare string unless it is a
constant).  These are not security holes but it is worth fixing
them anyway both for robustness and so folks looking for examples
in the tree are not misled into doing something potentially dangerous.
Furthermore, it is a bad idea to assume that pathnames will not
include '%' in them and that error routines don't return strings
with '%' in them (especially in light of the possibility of locales).

/*	$OpenBSD: calendar.c,v 1.13 2000/06/30 16:00:11 millert Exp $	*/

/*
 * 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.
 */

#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1989, 1993\n\
	The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#ifndef lint
#if 0
static const char sccsid[] = "@(#)calendar.c  8.3 (Berkeley) 3/25/94";
#else
static char rcsid[] = "$OpenBSD: calendar.c,v 1.13 2000/06/30 16:00:11 millert Exp $";
#endif
#endif /* not lint */

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

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

struct passwd *pw;
int doall = 0;
time_t f_time = 0;

int f_dayAfter = 0; /* days after current date */
int f_dayBefore = 0; /* days before current date */

struct specialev spev[NUMEV];

int
main(argc, argv)
	int argc;
	char *argv[];
{
	int ch, i;
	char *caldir;

	(void)setlocale(LC_ALL, "");

	while ((ch = getopt(argc, argv, "-af:t:A:B:")) != -1)
		switch (ch) {
		case '-':		/* backward contemptible */
		case 'a':
			if (getuid())
				errx(1, "%s", strerror(EPERM));
			doall = 1;
			break;

		case 'f': /* other calendar file */
		        calendarFile = optarg;
			break;

		case 't': /* other date, undocumented, for tests */
			if ((f_time = Mktime(optarg)) <= 0)
				errx(1, "specified date is outside allowed range");
			break;

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

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

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

	if (argc)
		usage();

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

	if (f_dayBefore) {
		/* Move back in time and only look forwards */
		f_dayAfter += f_dayBefore;
		f_time -= SECSPERDAY * f_dayBefore;
		f_dayBefore = 0;
	}
	settime(&f_time);

	if (doall) {
		while ((pw = getpwent()) != NULL) {
			(void)setlocale(LC_ALL, "");
			(void)setegid(pw->pw_gid);
			(void)initgroups(pw->pw_name, pw->pw_gid);
			(void)seteuid(pw->pw_uid);
			if (!chdir(pw->pw_dir)) {
				cal();
				/* Keep user settings from propogating */
				for (i = 0; i < NUMEV; i++)
					if (spev[i].uname != NULL)
						free(spev[i].uname);
			}
			(void)seteuid(0);
		}
	}
	else if ((caldir = getenv("CALENDAR_DIR")) != NULL) {
		if(!chdir(caldir))
			cal();
	} else
		cal();

	exit(0);
}


void
usage()
{
	(void)fprintf(stderr,
	    "usage: calendar [-a] [-A days] [-B days] [-f calendarfile] [-t [[[yy]yy][mm]]dd]\n");
	exit(1);
}