calendar.c revision 330897
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 * 4. 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 33static 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 40static char sccsid[] = "@(#)calendar.c 8.3 (Berkeley) 3/25/94"; 41#endif 42#endif 43 44#include <sys/cdefs.h> 45__FBSDID("$FreeBSD: stable/11/usr.bin/calendar/calendar.c 330897 2018-03-14 03:19:51Z eadler $"); 46 47#include <err.h> 48#include <errno.h> 49#include <locale.h> 50#include <pwd.h> 51#include <stdio.h> 52#include <stdlib.h> 53#include <string.h> 54#include <time.h> 55#include <unistd.h> 56 57#include "calendar.h" 58 59#define UTCOFFSET_NOTSET 100 /* Expected between -24 and +24 */ 60#define LONGITUDE_NOTSET 1000 /* Expected between -360 and +360 */ 61 62struct passwd *pw; 63int doall = 0; 64int debug = 0; 65static char *DEBUG = NULL; 66static time_t f_time = 0; 67double UTCOffset = UTCOFFSET_NOTSET; 68int EastLongitude = LONGITUDE_NOTSET; 69 70static void usage(void) __dead2; 71 72int 73main(int argc, char *argv[]) 74{ 75 int f_dayAfter = 0; /* days after current date */ 76 int f_dayBefore = 0; /* days before current date */ 77 int Friday = 5; /* day before weekend */ 78 79 int ch; 80 struct tm tp1, tp2; 81 82 (void)setlocale(LC_ALL, ""); 83 84 while ((ch = getopt(argc, argv, "-A:aB:D:dF:f:l:t:U:W:?")) != -1) 85 switch (ch) { 86 case '-': /* backward contemptible */ 87 case 'a': 88 if (getuid()) { 89 errno = EPERM; 90 err(1, NULL); 91 } 92 doall = 1; 93 break; 94 95 case 'W': /* we don't need no steenking Fridays */ 96 Friday = -1; 97 /* FALLTHROUGH */ 98 99 case 'A': /* days after current date */ 100 f_dayAfter = atoi(optarg); 101 if (f_dayAfter < 0) 102 errx(1, "number of days must be positive"); 103 break; 104 105 case 'B': /* days before current date */ 106 f_dayBefore = atoi(optarg); 107 if (f_dayBefore < 0) 108 errx(1, "number of days must be positive"); 109 break; 110 111 case 'D': /* debug output of sun and moon info */ 112 DEBUG = optarg; 113 break; 114 115 case 'd': /* debug output of current date */ 116 debug = 1; 117 break; 118 119 case 'F': /* Change the time: When does weekend start? */ 120 Friday = atoi(optarg); 121 break; 122 123 case 'f': /* other calendar file */ 124 calendarFile = optarg; 125 break; 126 127 case 'l': /* Change longitudal position */ 128 EastLongitude = strtol(optarg, NULL, 10); 129 break; 130 131 case 't': /* other date, for tests */ 132 f_time = Mktime(optarg); 133 break; 134 135 case 'U': /* Change UTC offset */ 136 UTCOffset = strtod(optarg, NULL); 137 break; 138 139 case '?': 140 default: 141 usage(); 142 } 143 144 argc -= optind; 145 argv += optind; 146 147 if (argc) 148 usage(); 149 150 /* use current time */ 151 if (f_time <= 0) 152 (void)time(&f_time); 153 154 /* if not set, determine where I could be */ 155 { 156 if (UTCOffset == UTCOFFSET_NOTSET && 157 EastLongitude == LONGITUDE_NOTSET) { 158 /* Calculate on difference between here and UTC */ 159 time_t t; 160 struct tm tm; 161 long utcoffset, hh, mm, ss; 162 double uo; 163 164 time(&t); 165 localtime_r(&t, &tm); 166 utcoffset = tm.tm_gmtoff; 167 /* seconds -> hh:mm:ss */ 168 hh = utcoffset / SECSPERHOUR; 169 utcoffset %= SECSPERHOUR; 170 mm = utcoffset / SECSPERMINUTE; 171 utcoffset %= SECSPERMINUTE; 172 ss = utcoffset; 173 174 /* hh:mm:ss -> hh.mmss */ 175 uo = mm + (100.0 * (ss / 60.0)); 176 uo /= 60.0 / 100.0; 177 uo = hh + uo / 100; 178 179 UTCOffset = uo; 180 EastLongitude = UTCOffset * 15; 181 } else if (UTCOffset == UTCOFFSET_NOTSET) { 182 /* Base on information given */ 183 UTCOffset = EastLongitude / 15; 184 } else if (EastLongitude == LONGITUDE_NOTSET) { 185 /* Base on information given */ 186 EastLongitude = UTCOffset * 15; 187 } 188 } 189 190 settimes(f_time, f_dayBefore, f_dayAfter, Friday, &tp1, &tp2); 191 generatedates(&tp1, &tp2); 192 193 /* 194 * FROM now on, we are working in UTC. 195 * This will only affect moon and sun related events anyway. 196 */ 197 if (setenv("TZ", "UTC", 1) != 0) 198 errx(1, "setenv: %s", strerror(errno)); 199 tzset(); 200 201 if (debug) 202 dumpdates(); 203 204 if (DEBUG != NULL) { 205 dodebug(DEBUG); 206 exit(0); 207 } 208 209 if (doall) 210 while ((pw = getpwent()) != NULL) { 211 (void)setegid(pw->pw_gid); 212 (void)initgroups(pw->pw_name, pw->pw_gid); 213 (void)seteuid(pw->pw_uid); 214 if (!chdir(pw->pw_dir)) 215 cal(); 216 (void)seteuid(0); 217 } 218 else 219 cal(); 220 exit(0); 221} 222 223 224static void __dead2 225usage(void) 226{ 227 228 fprintf(stderr, "%s\n%s\n%s\n", 229 "usage: calendar [-A days] [-a] [-B days] [-D sun|moon] [-d]", 230 " [-F friday] [-f calendarfile] [-l longitude]", 231 " [-t dd[.mm[.year]]] [-U utcoffset] [-W days]" 232 ); 233 exit(1); 234} 235