1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1989, 1993, 1994
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
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
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #ifndef lint
33 static const char copyright[] =
34 "@(#) Copyright (c) 1989, 1993\n\
35 The Regents of the University of California. All rights reserved.\n";
36 #endif
37
38 #if 0
39 #ifndef lint
40 static char sccsid[] = "@(#)calendar.c 8.3 (Berkeley) 3/25/94";
41 #endif
42 #endif
43
44 #include <sys/cdefs.h>
45 __FBSDID("$FreeBSD: stable/12/usr.bin/calendar/calendar.c 368921 2021-01-01 09:07:00Z se $");
46
47 #include <err.h>
48 #include <errno.h>
49 #include <locale.h>
50 #include <langinfo.h>
51 #include <pwd.h>
52 #include <stdio.h>
53 #include <stdlib.h>
54 #include <string.h>
55 #include <time.h>
56 #include <unistd.h>
57
58 #include "calendar.h"
59
60 #define UTCOFFSET_NOTSET 100 /* Expected between -24 and +24 */
61 #define LONGITUDE_NOTSET 1000 /* Expected between -360 and +360 */
62
63 struct passwd *pw;
64 int doall = 0;
65 int debug = 0;
66 static char *DEBUG = NULL;
67 static time_t f_time = 0;
68 double UTCOffset = UTCOFFSET_NOTSET;
69 int EastLongitude = LONGITUDE_NOTSET;
70 #ifdef WITH_ICONV
71 const char *outputEncoding;
72 #endif
73
74 static void usage(void) __dead2;
75
76 int
main(int argc,char * argv[])77 main(int argc, char *argv[])
78 {
79 int f_dayAfter = 0; /* days after current date */
80 int f_dayBefore = 0; /* days before current date */
81 int Friday = 5; /* day before weekend */
82
83 int ch;
84 struct tm tp1, tp2;
85
86 (void)setlocale(LC_ALL, "");
87 #ifdef WITH_ICONV
88 /* save the information about the encoding used in the terminal */
89 outputEncoding = strdup(nl_langinfo(CODESET));
90 if (outputEncoding == NULL)
91 errx(1, "cannot allocate memory");
92 #endif
93
94 while ((ch = getopt(argc, argv, "-A:aB:D:dF:f:l:t:U:W:?")) != -1)
95 switch (ch) {
96 case '-': /* backward contemptible */
97 case 'a':
98 if (getuid()) {
99 errno = EPERM;
100 err(1, NULL);
101 }
102 doall = 1;
103 break;
104
105 case 'W': /* we don't need no steenking Fridays */
106 Friday = -1;
107 /* FALLTHROUGH */
108
109 case 'A': /* days after current date */
110 f_dayAfter = atoi(optarg);
111 if (f_dayAfter < 0)
112 errx(1, "number of days must be positive");
113 break;
114
115 case 'B': /* days before current date */
116 f_dayBefore = atoi(optarg);
117 if (f_dayBefore < 0)
118 errx(1, "number of days must be positive");
119 break;
120
121 case 'D': /* debug output of sun and moon info */
122 DEBUG = optarg;
123 break;
124
125 case 'd': /* debug output of current date */
126 debug = 1;
127 break;
128
129 case 'F': /* Change the time: When does weekend start? */
130 Friday = atoi(optarg);
131 break;
132
133 case 'f': /* other calendar file */
134 calendarFile = optarg;
135 break;
136
137 case 'l': /* Change longitudal position */
138 EastLongitude = strtol(optarg, NULL, 10);
139 break;
140
141 case 't': /* other date, for tests */
142 f_time = Mktime(optarg);
143 break;
144
145 case 'U': /* Change UTC offset */
146 UTCOffset = strtod(optarg, NULL);
147 break;
148
149 case '?':
150 default:
151 usage();
152 }
153
154 argc -= optind;
155 argv += optind;
156
157 if (argc)
158 usage();
159
160 /* use current time */
161 if (f_time <= 0)
162 (void)time(&f_time);
163
164 /* if not set, determine where I could be */
165 {
166 if (UTCOffset == UTCOFFSET_NOTSET &&
167 EastLongitude == LONGITUDE_NOTSET) {
168 /* Calculate on difference between here and UTC */
169 time_t t;
170 struct tm tm;
171 long utcoffset, hh, mm, ss;
172 double uo;
173
174 time(&t);
175 localtime_r(&t, &tm);
176 utcoffset = tm.tm_gmtoff;
177 /* seconds -> hh:mm:ss */
178 hh = utcoffset / SECSPERHOUR;
179 utcoffset %= SECSPERHOUR;
180 mm = utcoffset / SECSPERMINUTE;
181 utcoffset %= SECSPERMINUTE;
182 ss = utcoffset;
183
184 /* hh:mm:ss -> hh.mmss */
185 uo = mm + (100.0 * (ss / 60.0));
186 uo /= 60.0 / 100.0;
187 uo = hh + uo / 100;
188
189 UTCOffset = uo;
190 EastLongitude = UTCOffset * 15;
191 } else if (UTCOffset == UTCOFFSET_NOTSET) {
192 /* Base on information given */
193 UTCOffset = EastLongitude / 15;
194 } else if (EastLongitude == LONGITUDE_NOTSET) {
195 /* Base on information given */
196 EastLongitude = UTCOffset * 15;
197 }
198 }
199
200 settimes(f_time, f_dayBefore, f_dayAfter, Friday, &tp1, &tp2);
201 generatedates(&tp1, &tp2);
202
203 /*
204 * FROM now on, we are working in UTC.
205 * This will only affect moon and sun related events anyway.
206 */
207 if (setenv("TZ", "UTC", 1) != 0)
208 errx(1, "setenv: %s", strerror(errno));
209 tzset();
210
211 if (debug)
212 dumpdates();
213
214 if (DEBUG != NULL) {
215 dodebug(DEBUG);
216 exit(0);
217 }
218
219 if (doall)
220 while ((pw = getpwent()) != NULL) {
221 (void)setegid(pw->pw_gid);
222 (void)initgroups(pw->pw_name, pw->pw_gid);
223 (void)seteuid(pw->pw_uid);
224 if (!chdir(pw->pw_dir)) {
225 setenv("HOME", pw->pw_dir, 1);
226 cal();
227 }
228 (void)seteuid(0);
229 }
230 else
231 cal();
232 exit(0);
233 }
234
235
236 static void __dead2
usage(void)237 usage(void)
238 {
239
240 fprintf(stderr, "%s\n%s\n%s\n",
241 "usage: calendar [-A days] [-a] [-B days] [-D sun|moon] [-d]",
242 " [-F friday] [-f calendarfile] [-l longitude]",
243 " [-t dd[.mm[.year]]] [-U utcoffset] [-W days]"
244 );
245 exit(1);
246 }
247