/usr.bin/calendar/calendar.c

  1/*-
  2 * Copyright (c) 1989, 1993, 1994
  3 *	The Regents of the University of California.  All rights reserved.
  4 *
  5 * Redistribution and use in source and binary forms, with or without
  6 * modification, are permitted provided that the following conditions
  7 * are met:
  8 * 1. Redistributions of source code must retain the above copyright
  9 *    notice, this list of conditions and the following disclaimer.
 10 * 2. Redistributions in binary form must reproduce the above copyright
 11 *    notice, this list of conditions and the following disclaimer in the
 12 *    documentation and/or other materials provided with the distribution.
 13 * 4. Neither the name of the University nor the names of its contributors
 14 *    may be used to endorse or promote products derived from this software
 15 *    without specific prior written permission.
 16 *
 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 27 * SUCH DAMAGE.
 28 */
 29
 30#ifndef lint
 31static const char copyright[] =
 32"@(#) Copyright (c) 1989, 1993\n\
 33	The Regents of the University of California.  All rights reserved.\n";
 34#endif
 35
 36#if 0
 37#ifndef lint
 38static char sccsid[] = "@(#)calendar.c	8.3 (Berkeley) 3/25/94";
 39#endif
 40#endif
 41
 42#include <sys/cdefs.h>
 43__FBSDID("$FreeBSD$");
 44
 45#include <err.h>
 46#include <errno.h>
 47#include <locale.h>
 48#include <pwd.h>
 49#include <stdio.h>
 50#include <stdlib.h>
 51#include <string.h>
 52#include <time.h>
 53#include <unistd.h>
 54
 55#include "calendar.h"
 56
 57#define	UTCOFFSET_NOTSET	100	/* Expected between -24 and +24 */
 58#define	LONGITUDE_NOTSET	1000	/* Expected between -360 and +360 */
 59
 60struct passwd	*pw;
 61int		doall = 0;
 62int		debug = 0;
 63char		*DEBUG = NULL;
 64time_t		f_time = 0;
 65double		UTCOffset = UTCOFFSET_NOTSET;
 66int		EastLongitude = LONGITUDE_NOTSET;
 67
 68static void	usage(void) __dead2;
 69
 70int
 71main(int argc, char *argv[])
 72{
 73	int	f_dayAfter = 0;		/* days after current date */
 74	int	f_dayBefore = 0;	/* days before current date */
 75	int	Friday = 5;		/* day before weekend */
 76
 77	int ch;
 78	struct tm tp1, tp2;
 79
 80	(void)setlocale(LC_ALL, "");
 81
 82	while ((ch = getopt(argc, argv, "-A:aB:D:dF:f:l:t:U:W:?")) != -1)
 83		switch (ch) {
 84		case '-':		/* backward contemptible */
 85		case 'a':
 86			if (getuid()) {
 87				errno = EPERM;
 88				err(1, NULL);
 89			}
 90			doall = 1;
 91			break;
 92
 93		case 'W': /* we don't need no steenking Fridays */
 94			Friday = -1;
 95			/* FALLTHROUGH */
 96
 97		case 'A': /* days after current date */
 98			f_dayAfter = atoi(optarg);
 99			break;
100
101		case 'B': /* days before current date */
102			f_dayBefore = atoi(optarg);
103			break;
104
105		case 'D': /* debug output of sun and moon info */
106			DEBUG = optarg;
107			break;
108
109		case 'd': /* debug output of current date */
110			debug = 1;
111			break;
112
113		case 'F': /* Change the time: When does weekend start? */
114			Friday = atoi(optarg);
115			break;
116
117		case 'f': /* other calendar file */
118			calendarFile = optarg;
119			break;
120
121		case 'l': /* Change longitudal position */
122			EastLongitude = strtol(optarg, NULL, 10);
123			break;
124
125		case 't': /* other date, for tests */
126			f_time = Mktime(optarg);
127			break;
128
129		case 'U': /* Change UTC offset */
130			UTCOffset = strtod(optarg, NULL);
131			break;
132
133		case '?':
134		default:
135			usage();
136		}
137
138	argc -= optind;
139	argv += optind;
140
141	if (argc)
142		usage();
143
144	/* use current time */
145	if (f_time <= 0)
146		(void)time(&f_time);
147
148	/* if not set, determine where I could be */
149	{
150		if (UTCOffset == UTCOFFSET_NOTSET &&
151		    EastLongitude == LONGITUDE_NOTSET) {
152			/* Calculate on difference between here and UTC */
153			time_t t;
154			struct tm tm;
155			long utcoffset, hh, mm, ss;
156			double uo;
157
158			time(&t);
159			localtime_r(&t, &tm);
160			utcoffset = tm.tm_gmtoff;
161			/* seconds -> hh:mm:ss */
162			hh = utcoffset / SECSPERHOUR;
163			utcoffset %= SECSPERHOUR;
164			mm = utcoffset / SECSPERMINUTE;
165			utcoffset %= SECSPERMINUTE;
166			ss = utcoffset;
167
168			/* hh:mm:ss -> hh.mmss */
169			uo = mm + (100.0 * (ss / 60.0));
170			uo /=  60.0 / 100.0;
171			uo = hh + uo / 100;
172
173			UTCOffset = uo;
174			EastLongitude = UTCOffset * 15;
175		} else if (UTCOffset == UTCOFFSET_NOTSET) {
176			/* Base on information given */
177			UTCOffset = EastLongitude / 15;
178		} else if (EastLongitude == LONGITUDE_NOTSET) {
179			/* Base on information given */
180			EastLongitude = UTCOffset * 15;
181		}
182	}
183
184	settimes(f_time, f_dayBefore, f_dayAfter, Friday, &tp1, &tp2);
185	generatedates(&tp1, &tp2);
186
187	/*
188	 * FROM now on, we are working in UTC.
189	 * This will only affect moon and sun related events anyway.
190	 */
191	if (setenv("TZ", "UTC", 1) != 0)
192		errx(1, "setenv: %s", strerror(errno));
193	tzset();
194
195	if (debug)
196		dumpdates();
197
198	if (DEBUG != NULL) {
199		dodebug(DEBUG);
200		exit(0);
201	}
202
203	if (doall)
204		while ((pw = getpwent()) != NULL) {
205			(void)setegid(pw->pw_gid);
206			(void)initgroups(pw->pw_name, pw->pw_gid);
207			(void)seteuid(pw->pw_uid);
208			if (!chdir(pw->pw_dir))
209				cal();
210			(void)seteuid(0);
211		}
212	else
213		cal();
214	exit(0);
215}
216
217
218static void __dead2
219usage(void)
220{
221
222	fprintf(stderr, "%s\n%s\n%s\n",
223	    "usage: calendar [-A days] [-a] [-B days] [-D sun|moon] [-d]",
224	    "		     [-F friday] [-f calendarfile] [-l longitude]",
225	    "		     [-t dd[.mm[.year]]] [-U utcoffset] [-W days]"
226	    );
227	exit(1);
228}