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#include <sys/types.h>
33#include <err.h>
34#include <errno.h>
35#include <locale.h>
36#include <login_cap.h>
37#include <langinfo.h>
38#include <pwd.h>
39#include <stdio.h>
40#include <stdlib.h>
41#include <string.h>
42#include <time.h>
43#include <unistd.h>
44
45#include "calendar.h"
46
47#define	UTCOFFSET_NOTSET	100	/* Expected between -24 and +24 */
48#define	LONGITUDE_NOTSET	1000	/* Expected between -360 and +360 */
49
50struct passwd	*pw;
51int		doall = 0;
52int		debug = 0;
53static char	*DEBUG = NULL;
54static time_t	f_time = 0;
55double		UTCOffset = UTCOFFSET_NOTSET;
56int		EastLongitude = LONGITUDE_NOTSET;
57#ifdef WITH_ICONV
58const char	*outputEncoding = NULL;
59#endif
60
61static void	usage(void) __dead2;
62
63int
64main(int argc, char *argv[])
65{
66	int	f_dayAfter = 0;		/* days after current date */
67	int	f_dayBefore = 0;	/* days before current date */
68	int	Friday = 5;		/* day before weekend */
69
70	int ch;
71	struct tm tp1, tp2;
72
73	(void)setlocale(LC_ALL, "");
74
75	while ((ch = getopt(argc, argv, "-A:aB:D:dF:f:l:t:U:W:?")) != -1)
76		switch (ch) {
77		case '-':		/* backward contemptible */
78		case 'a':
79			if (getuid()) {
80				errno = EPERM;
81				err(1, NULL);
82			}
83			doall = 1;
84			break;
85
86		case 'W': /* we don't need no steenking Fridays */
87			Friday = -1;
88			/* FALLTHROUGH */
89
90		case 'A': /* days after current date */
91			f_dayAfter = atoi(optarg);
92			if (f_dayAfter < 0)
93				errx(1, "number of days must be positive");
94			break;
95
96		case 'B': /* days before current date */
97			f_dayBefore = atoi(optarg);
98			if (f_dayBefore < 0)
99				errx(1, "number of days must be positive");
100			break;
101
102		case 'D': /* debug output of sun and moon info */
103			DEBUG = optarg;
104			break;
105
106		case 'd': /* debug output of current date */
107			debug = 1;
108			break;
109
110		case 'F': /* Change the time: When does weekend start? */
111			Friday = atoi(optarg);
112			break;
113
114		case 'f': /* other calendar file */
115			calendarFile = optarg;
116			break;
117
118		case 'l': /* Change longitudal position */
119			EastLongitude = strtol(optarg, NULL, 10);
120			break;
121
122		case 't': /* other date, for tests */
123			f_time = Mktime(optarg);
124			break;
125
126		case 'U': /* Change UTC offset */
127			UTCOffset = strtod(optarg, NULL);
128			break;
129
130		case '?':
131		default:
132			usage();
133		}
134
135	argc -= optind;
136	argv += optind;
137
138	if (argc)
139		usage();
140
141	/* use current time */
142	if (f_time <= 0)
143		(void)time(&f_time);
144
145	/* if not set, determine where I could be */
146	{
147		if (UTCOffset == UTCOFFSET_NOTSET &&
148		    EastLongitude == LONGITUDE_NOTSET) {
149			/* Calculate on difference between here and UTC */
150			time_t t;
151			struct tm tm;
152			long utcoffset, hh, mm, ss;
153			double uo;
154
155			time(&t);
156			localtime_r(&t, &tm);
157			utcoffset = tm.tm_gmtoff;
158			/* seconds -> hh:mm:ss */
159			hh = utcoffset / SECSPERHOUR;
160			utcoffset %= SECSPERHOUR;
161			mm = utcoffset / SECSPERMINUTE;
162			utcoffset %= SECSPERMINUTE;
163			ss = utcoffset;
164
165			/* hh:mm:ss -> hh.mmss */
166			uo = mm + (100.0 * (ss / 60.0));
167			uo /=  60.0 / 100.0;
168			uo = hh + uo / 100;
169
170			UTCOffset = uo;
171			EastLongitude = UTCOffset * 15;
172		} else if (UTCOffset == UTCOFFSET_NOTSET) {
173			/* Base on information given */
174			UTCOffset = EastLongitude / 15;
175		} else if (EastLongitude == LONGITUDE_NOTSET) {
176			/* Base on information given */
177			EastLongitude = UTCOffset * 15;
178		}
179	}
180
181	settimes(f_time, f_dayBefore, f_dayAfter, Friday, &tp1, &tp2);
182	generatedates(&tp1, &tp2);
183
184	/*
185	 * FROM now on, we are working in UTC.
186	 * This will only affect moon and sun related events anyway.
187	 */
188	if (setenv("TZ", "UTC", 1) != 0)
189		errx(1, "setenv: %s", strerror(errno));
190	tzset();
191
192	if (debug)
193		dumpdates();
194
195	if (DEBUG != NULL) {
196		dodebug(DEBUG);
197		exit(0);
198	}
199
200	if (doall)
201		while ((pw = getpwent()) != NULL) {
202			pid_t pid;
203
204			if (chdir(pw->pw_dir) == -1)
205				continue;
206			pid = fork();
207			if (pid < 0)
208				err(1, "fork");
209			if (pid == 0) {
210				login_cap_t *lc;
211
212				lc = login_getpwclass(pw);
213				if (setusercontext(lc, pw, pw->pw_uid,
214				    LOGIN_SETALL) != 0)
215					errx(1, "setusercontext");
216				setenv("HOME", pw->pw_dir, 1);
217				cal();
218				exit(0);
219			}
220		}
221	else {
222#ifdef WITH_ICONV
223		/* Save the information about the encoding used in the terminal. */
224		outputEncoding = strdup(nl_langinfo(CODESET));
225		if (outputEncoding == NULL)
226			errx(1, "cannot allocate memory");
227#endif
228		cal();
229	}
230	exit(0);
231}
232
233
234static void __dead2
235usage(void)
236{
237
238	fprintf(stderr, "%s\n%s\n%s\n",
239	    "usage: calendar [-A days] [-a] [-B days] [-D sun|moon] [-d]",
240	    "		     [-F friday] [-f calendarfile] [-l longitude]",
241	    "		     [-t dd[.mm[.year]]] [-U utcoffset] [-W days]"
242	    );
243	exit(1);
244}
245