calendar.c revision 205821
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 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34#ifndef lint 35static const char copyright[] = 36"@(#) Copyright (c) 1989, 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38#endif 39 40#if 0 41#ifndef lint 42static char sccsid[] = "@(#)calendar.c 8.3 (Berkeley) 3/25/94"; 43#endif 44#endif 45 46#include <sys/cdefs.h> 47__FBSDID("$FreeBSD: head/usr.bin/calendar/calendar.c 205821 2010-03-29 06:49:20Z edwin $"); 48 49#include <err.h> 50#include <errno.h> 51#include <locale.h> 52#include <pwd.h> 53#include <stdio.h> 54#include <stdlib.h> 55#include <string.h> 56#include <time.h> 57#include <unistd.h> 58 59#include "calendar.h" 60 61#define UTCOFFSET_NOTSET 100 /* Expected between -24 and +24 */ 62#define LONGITUDE_NOTSET 1000 /* Expected between -360 and +360 */ 63 64struct passwd *pw; 65int doall = 0; 66int debug = 0; 67char *DEBUG = NULL; 68time_t f_time = 0; 69double UTCOffset = UTCOFFSET_NOTSET; 70int EastLongitude = LONGITUDE_NOTSET; 71 72static void usage(void) __dead2; 73 74int 75main(int argc, char *argv[]) 76{ 77 int f_dayAfter = 0; /* days after current date */ 78 int f_dayBefore = 0; /* days before current date */ 79 int Friday = 5; /* day before weekend */ 80 81 int ch; 82 struct tm tp1, tp2; 83 84 (void)setlocale(LC_ALL, ""); 85 86 while ((ch = getopt(argc, argv, "-A:aB:dD:F:f:l:t:U:W:")) != -1) 87 switch (ch) { 88 case '-': /* backward contemptible */ 89 case 'a': 90 if (getuid()) { 91 errno = EPERM; 92 err(1, NULL); 93 } 94 doall = 1; 95 break; 96 97 case 'f': /* other calendar file */ 98 calendarFile = optarg; 99 break; 100 101 case 'W': /* we don't need no steenking Fridays */ 102 Friday = -1; 103 /* FALLTHROUGH */ 104 105 case 'A': /* days after current date */ 106 f_dayAfter = atoi(optarg); 107 break; 108 109 case 'B': /* days before current date */ 110 f_dayBefore = atoi(optarg); 111 break; 112 113 case 'F': /* Change the time: When does weekend start? */ 114 Friday = atoi(optarg); 115 break; 116 case 'l': /* Change longitudal position */ 117 EastLongitude = strtol(optarg, NULL, 10); 118 break; 119 case 'U': /* Change UTC offset */ 120 UTCOffset = strtod(optarg, NULL); 121 break; 122 123 case 'd': 124 debug = 1; 125 break; 126 case 'D': 127 DEBUG = optarg; 128 break; 129 case 't': /* other date, undocumented, for tests */ 130 f_time = Mktime(optarg); 131 break; 132 133 case '?': 134 default: 135 usage(); 136 } 137 138 argc -= optind; 139 argv += optind; 140 141 if (argc) 142 usage(); 143 144 /* use current time */ 145 if (f_time <= 0) 146 (void)time(&f_time); 147 148 /* if not set, determine where I could be */ 149 { 150 if (UTCOffset == UTCOFFSET_NOTSET && 151 EastLongitude == LONGITUDE_NOTSET) { 152 /* Calculate on difference between here and UTC */ 153 time_t t; 154 struct tm tm; 155 long utcoffset, hh, mm, ss; 156 double uo; 157 158 time(&t); 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; 166 ss = utcoffset; 167 168 /* hh:mm:ss -> hh.mmss */ 169 uo = mm + (100.0 * (ss / 60.0)); 170 uo /= 60.0 / 100.0; 171 uo = hh + uo / 100; 172 173 UTCOffset = uo; 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; 181 } 182 } 183 184 settimes(f_time, f_dayBefore, f_dayAfter, Friday, &tp1, &tp2); 185 generatedates(&tp1, &tp2); 186 187 /* 188 * FROM now on, we are working in UTC. 189 * This will only affect moon and sun related events anyway. 190 */ 191 if (setenv("TZ", "UTC", 1) != 0) 192 errx(1, "setenv: %s", strerror(errno)); 193 tzset(); 194 195 if (debug) 196 dumpdates(); 197 198 if (DEBUG != NULL) { 199 dodebug(DEBUG); 200 exit(0); 201 } 202 203 if (doall) 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)) 209 cal(); 210 (void)seteuid(0); 211 } 212 else 213 cal(); 214 exit(0); 215} 216 217 218static void __dead2 219usage(void) 220{ 221 222 fprintf(stderr, "%s\n%s\n%s\n", 223 "usage: calendar [-a] [-A days] [-B days] [-F friday] " 224 "[-f calendarfile]", 225 " [-d] [-t dd[.mm[.year]]] [-W days]", 226 " [-U utcoffset] [-l longitude]" 227 ); 228 exit(1); 229} 230