1/* $NetBSD: tzfile.h,v 1.6 1998/07/30 14:11:22 kleink Exp $ */ 2 3/* 4 * Copyright (c) 1988, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Arthur David Olson of the National Cancer Institute. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)tzfile.h 8.1 (Berkeley) 6/2/93 35 */ 36 37#ifndef _TZFILE_H_ 38#define _TZFILE_H_ 39 40/* 41 * Information about time zone files. 42 */ 43 /* Time zone object file directory */ 44#define TZDIR "/usr/share/zoneinfo" 45#define TZDEFAULT "/etc/localtime" 46#define TZDEFRULES "posixrules" 47 48/* 49** Each file begins with. . . 50*/ 51 52#define TZ_MAGIC "TZif" 53 54struct tzhead { 55 char tzh_magic[4]; /* TZ_MAGIC */ 56 char tzh_reserved[16]; /* reserved for future use */ 57 char tzh_ttisgmtcnt[4]; /* coded number of trans. time flags */ 58 char tzh_ttisstdcnt[4]; /* coded number of trans. time flags */ 59 char tzh_leapcnt[4]; /* coded number of leap seconds */ 60 char tzh_timecnt[4]; /* coded number of transition times */ 61 char tzh_typecnt[4]; /* coded number of local time types */ 62 char tzh_charcnt[4]; /* coded number of abbr. chars */ 63}; 64 65/* 66** . . .followed by. . . 67** 68** tzh_timecnt (char [4])s coded transition times a la time(2) 69** tzh_timecnt (unsigned char)s types of local time starting at above 70** tzh_typecnt repetitions of 71** one (char [4]) coded UTC offset in seconds 72** one (unsigned char) used to set tm_isdst 73** one (unsigned char) that's an abbreviation list index 74** tzh_charcnt (char)s '\0'-terminated zone abbreviations 75** tzh_leapcnt repetitions of 76** one (char [4]) coded leap second transition times 77** one (char [4]) total correction after above 78** tzh_ttisstdcnt (char)s indexed by type; if TRUE, transition 79** time is standard time, if FALSE, 80** transition time is wall clock time 81** if absent, transition times are 82** assumed to be wall clock time 83** tzh_ttisgmtcnt (char)s indexed by type; if TRUE, transition 84** time is UTC, if FALSE, 85** transition time is wall clock time 86** if absent, transition times are 87** assumed to be local time 88*/ 89 90/* 91** In the current implementation, "tzset()" refuses to deal with files that 92** exceed any of the limits below. 93*/ 94 95/* 96** The TZ_MAX_TIMES value below is enough to handle a bit more than a 97** year's worth of solar time (corrected daily to the nearest second) or 98** 138 years of Pacific Presidential Election time 99** (where there are three time zone transitions every fourth year). 100*/ 101#define TZ_MAX_TIMES 370 102 103#define NOSOLAR /* 4BSD doesn't currently handle solar time */ 104 105#ifndef NOSOLAR 106#define TZ_MAX_TYPES 256 /* Limited by what (unsigned char)'s can hold */ 107#else 108#define TZ_MAX_TYPES 10 /* Maximum number of local time types */ 109#endif 110 111#define TZ_MAX_CHARS 50 /* Maximum number of abbreviation characters */ 112 113#define TZ_MAX_LEAPS 50 /* Maximum number of leap second corrections */ 114 115#define SECSPERMIN 60 116#define MINSPERHOUR 60 117#define HOURSPERDAY 24 118#define DAYSPERWEEK 7 119#define DAYSPERNYEAR 365 120#define DAYSPERLYEAR 366 121#define SECSPERHOUR (SECSPERMIN * MINSPERHOUR) 122#define SECSPERDAY ((long) SECSPERHOUR * HOURSPERDAY) 123#define MONSPERYEAR 12 124 125#define TM_SUNDAY 0 126#define TM_MONDAY 1 127#define TM_TUESDAY 2 128#define TM_WEDNESDAY 3 129#define TM_THURSDAY 4 130#define TM_FRIDAY 5 131#define TM_SATURDAY 6 132 133#define TM_JANUARY 0 134#define TM_FEBRUARY 1 135#define TM_MARCH 2 136#define TM_APRIL 3 137#define TM_MAY 4 138#define TM_JUNE 5 139#define TM_JULY 6 140#define TM_AUGUST 7 141#define TM_SEPTEMBER 8 142#define TM_OCTOBER 9 143#define TM_NOVEMBER 10 144#define TM_DECEMBER 11 145 146#define TM_YEAR_BASE 1900 147 148#define EPOCH_YEAR 1970 149#define EPOCH_WDAY TM_THURSDAY 150 151/* 152** Accurate only for the past couple of centuries; 153** that will probably do. 154*/ 155 156#define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0) 157 158#endif /* !_TZFILE_H_ */ 159