2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1989, 1993, 1994
5 * The Regents of the University of California. All rights reserved.
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8 * modification, are permitted provided that the following conditions
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11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
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17 * without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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34 static char sccsid[] = "@(#)calendar.c 8.3 (Berkeley) 3/25/94";
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD: head/usr.bin/calendar/calendar.c 326025 2017-11-20 19:49:47Z pfg $");
53 #define UTCOFFSET_NOTSET 100 /* Expected between -24 and +24 */
54 #define LONGITUDE_NOTSET 1000 /* Expected between -360 and +360 */
59 static char *DEBUG = NULL;
60 static time_t f_time = 0;
61 double UTCOffset = UTCOFFSET_NOTSET;
62 int EastLongitude = LONGITUDE_NOTSET;
64 static void usage(void) __dead2;
67 main(int argc, char *argv[])
69 int f_dayAfter = 0; /* days after current date */
70 int f_dayBefore = 0; /* days before current date */
71 int Friday = 5; /* day before weekend */
76 (void)setlocale(LC_ALL, "");
78 while ((ch = getopt(argc, argv, "-A:aB:D:dF:f:l:t:U:W:?")) != -1)
80 case '-': /* backward contemptible */
89 case 'W': /* we don't need no steenking Fridays */
93 case 'A': /* days after current date */
94 f_dayAfter = atoi(optarg);
96 errx(1, "number of days must be positive");
99 case 'B': /* days before current date */
100 f_dayBefore = atoi(optarg);
102 errx(1, "number of days must be positive");
105 case 'D': /* debug output of sun and moon info */
109 case 'd': /* debug output of current date */
113 case 'F': /* Change the time: When does weekend start? */
114 Friday = atoi(optarg);
117 case 'f': /* other calendar file */
118 calendarFile = optarg;
121 case 'l': /* Change longitudal position */
122 EastLongitude = strtol(optarg, NULL, 10);
125 case 't': /* other date, for tests */
126 f_time = Mktime(optarg);
129 case 'U': /* Change UTC offset */
130 UTCOffset = strtod(optarg, NULL);
144 /* use current time */
148 /* if not set, determine where I could be */
150 if (UTCOffset == UTCOFFSET_NOTSET &&
151 EastLongitude == LONGITUDE_NOTSET) {
152 /* Calculate on difference between here and UTC */
155 long utcoffset, hh, mm, ss;
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;
168 /* hh:mm:ss -> hh.mmss */
169 uo = mm + (100.0 * (ss / 60.0));
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;
184 settimes(f_time, f_dayBefore, f_dayAfter, Friday, &tp1, &tp2);
185 generatedates(&tp1, &tp2);
188 * FROM now on, we are working in UTC.
189 * This will only affect moon and sun related events anyway.
191 if (setenv("TZ", "UTC", 1) != 0)
192 errx(1, "setenv: %s", strerror(errno));
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))
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]"