calendar.c revision 267654
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: releng/9.3/usr.bin/calendar/calendar.c 205872 2010-03-30 06:42:01Z edwin $"); 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:dD:F: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 'f': /* other calendar file */ 94 calendarFile = optarg; 95 break; 96 97 case 'W': /* we don't need no steenking Fridays */ 98 Friday = -1; 99 /* FALLTHROUGH */ 100 101 case 'A': /* days after current date */ 102 f_dayAfter = atoi(optarg); 103 break; 104 105 case 'B': /* days before current date */ 106 f_dayBefore = atoi(optarg); 107 break; 108 109 case 'F': /* Change the time: When does weekend start? */ 110 Friday = atoi(optarg); 111 break; 112 case 'l': /* Change longitudal position */ 113 EastLongitude = strtol(optarg, NULL, 10); 114 break; 115 case 'U': /* Change UTC offset */ 116 UTCOffset = strtod(optarg, NULL); 117 break; 118 119 case 'd': 120 debug = 1; 121 break; 122 case 'D': 123 DEBUG = optarg; 124 break; 125 case 't': /* other date, undocumented, for tests */ 126 f_time = Mktime(optarg); 127 break; 128 129 case '?': 130 default: 131 usage(); 132 } 133 134 argc -= optind; 135 argv += optind; 136 137 if (argc) 138 usage(); 139 140 /* use current time */ 141 if (f_time <= 0) 142 (void)time(&f_time); 143 144 /* if not set, determine where I could be */ 145 { 146 if (UTCOffset == UTCOFFSET_NOTSET && 147 EastLongitude == LONGITUDE_NOTSET) { 148 /* Calculate on difference between here and UTC */ 149 time_t t; 150 struct tm tm; 151 long utcoffset, hh, mm, ss; 152 double uo; 153 154 time(&t); 155 localtime_r(&t, &tm); 156 utcoffset = tm.tm_gmtoff; 157 /* seconds -> hh:mm:ss */ 158 hh = utcoffset / SECSPERHOUR; 159 utcoffset %= SECSPERHOUR; 160 mm = utcoffset / SECSPERMINUTE; 161 utcoffset %= SECSPERMINUTE; 162 ss = utcoffset; 163 164 /* hh:mm:ss -> hh.mmss */ 165 uo = mm + (100.0 * (ss / 60.0)); 166 uo /= 60.0 / 100.0; 167 uo = hh + uo / 100; 168 169 UTCOffset = uo; 170 EastLongitude = UTCOffset * 15; 171 } else if (UTCOffset == UTCOFFSET_NOTSET) { 172 /* Base on information given */ 173 UTCOffset = EastLongitude / 15; 174 } else if (EastLongitude == LONGITUDE_NOTSET) { 175 /* Base on information given */ 176 EastLongitude = UTCOffset * 15; 177 } 178 } 179 180 settimes(f_time, f_dayBefore, f_dayAfter, Friday, &tp1, &tp2); 181 generatedates(&tp1, &tp2); 182 183 /* 184 * FROM now on, we are working in UTC. 185 * This will only affect moon and sun related events anyway. 186 */ 187 if (setenv("TZ", "UTC", 1) != 0) 188 errx(1, "setenv: %s", strerror(errno)); 189 tzset(); 190 191 if (debug) 192 dumpdates(); 193 194 if (DEBUG != NULL) { 195 dodebug(DEBUG); 196 exit(0); 197 } 198 199 if (doall) 200 while ((pw = getpwent()) != NULL) { 201 (void)setegid(pw->pw_gid); 202 (void)initgroups(pw->pw_name, pw->pw_gid); 203 (void)seteuid(pw->pw_uid); 204 if (!chdir(pw->pw_dir)) 205 cal(); 206 (void)seteuid(0); 207 } 208 else 209 cal(); 210 exit(0); 211} 212 213 214static void __dead2 215usage(void) 216{ 217 218 fprintf(stderr, "%s\n%s\n%s\n", 219 "usage: calendar [-a] [-A days] [-B days] [-F friday] " 220 "[-f calendarfile]", 221 " [-d] [-t dd[.mm[.year]]] [-W days]", 222 " [-U utcoffset] [-l longitude]" 223 ); 224 exit(1); 225} 226