tzfile.h revision 92991
1#ifndef TZFILE_H 2#define TZFILE_H 3 4 5/* 6** This file is in the public domain, so clarified as of 7** 1996-06-05 by Arthur David Olson (arthur_david_olson@nih.gov). 8** 9** $FreeBSD: head/lib/libc/stdtime/tzfile.h 92991 2002-03-22 23:42:05Z obrien $ 10*/ 11 12/* 13** This header is for use ONLY with the time conversion code. 14** There is no guarantee that it will remain unchanged, 15** or that it will remain at all. 16** Do NOT copy it to any system include directory. 17** Thank you! 18*/ 19 20/* 21** ID 22*/ 23 24#ifndef lint 25#ifndef NOID 26/* 27static char tzfilehid[] = "@(#)tzfile.h 7.14"; 28*/ 29#endif /* !defined NOID */ 30#endif /* !defined lint */ 31 32/* 33** Information about time zone files. 34*/ 35 36#ifndef TZDIR 37#define TZDIR "/usr/share/zoneinfo" /* Time zone object file directory */ 38#endif /* !defined TZDIR */ 39 40#ifndef TZDEFAULT 41#define TZDEFAULT "/etc/localtime" 42#endif /* !defined TZDEFAULT */ 43 44#ifndef TZDEFRULES 45#define TZDEFRULES "posixrules" 46#endif /* !defined TZDEFRULES */ 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 local 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#ifndef TZ_MAX_TIMES 96/* 97** The TZ_MAX_TIMES value below is enough to handle a bit more than a 98** year's worth of solar time (corrected daily to the nearest second) or 99** 138 years of Pacific Presidential Election time 100** (where there are three time zone transitions every fourth year). 101*/ 102#define TZ_MAX_TIMES 370 103#endif /* !defined TZ_MAX_TIMES */ 104 105#ifndef TZ_MAX_TYPES 106#ifndef NOSOLAR 107#define TZ_MAX_TYPES 256 /* Limited by what (unsigned char)'s can hold */ 108#endif /* !defined NOSOLAR */ 109#ifdef NOSOLAR 110/* 111** Must be at least 14 for Europe/Riga as of Jan 12 1995, 112** as noted by Earl Chew <earl@hpato.aus.hp.com>. 113*/ 114#define TZ_MAX_TYPES 20 /* Maximum number of local time types */ 115#endif /* !defined NOSOLAR */ 116#endif /* !defined TZ_MAX_TYPES */ 117 118#ifndef TZ_MAX_CHARS 119#define TZ_MAX_CHARS 50 /* Maximum number of abbreviation characters */ 120 /* (limited by what unsigned chars can hold) */ 121#endif /* !defined TZ_MAX_CHARS */ 122 123#ifndef TZ_MAX_LEAPS 124#define TZ_MAX_LEAPS 50 /* Maximum number of leap second corrections */ 125#endif /* !defined TZ_MAX_LEAPS */ 126 127#define SECSPERMIN 60 128#define MINSPERHOUR 60 129#define HOURSPERDAY 24 130#define DAYSPERWEEK 7 131#define DAYSPERNYEAR 365 132#define DAYSPERLYEAR 366 133#define SECSPERHOUR (SECSPERMIN * MINSPERHOUR) 134#define SECSPERDAY ((long) SECSPERHOUR * HOURSPERDAY) 135#define MONSPERYEAR 12 136 137#define TM_SUNDAY 0 138#define TM_MONDAY 1 139#define TM_TUESDAY 2 140#define TM_WEDNESDAY 3 141#define TM_THURSDAY 4 142#define TM_FRIDAY 5 143#define TM_SATURDAY 6 144 145#define TM_JANUARY 0 146#define TM_FEBRUARY 1 147#define TM_MARCH 2 148#define TM_APRIL 3 149#define TM_MAY 4 150#define TM_JUNE 5 151#define TM_JULY 6 152#define TM_AUGUST 7 153#define TM_SEPTEMBER 8 154#define TM_OCTOBER 9 155#define TM_NOVEMBER 10 156#define TM_DECEMBER 11 157 158#define TM_YEAR_BASE 1900 159 160#define EPOCH_YEAR 1970 161#define EPOCH_WDAY TM_THURSDAY 162 163/* 164** Accurate only for the past couple of centuries; 165** that will probably do. 166*/ 167 168#define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0)) 169 170#ifndef USG 171 172/* 173** Use of the underscored variants may cause problems if you move your code to 174** certain System-V-based systems; for maximum portability, use the 175** underscore-free variants. The underscored variants are provided for 176** backward compatibility only; they may disappear from future versions of 177** this file. 178*/ 179 180#define SECS_PER_MIN SECSPERMIN 181#define MINS_PER_HOUR MINSPERHOUR 182#define HOURS_PER_DAY HOURSPERDAY 183#define DAYS_PER_WEEK DAYSPERWEEK 184#define DAYS_PER_NYEAR DAYSPERNYEAR 185#define DAYS_PER_LYEAR DAYSPERLYEAR 186#define SECS_PER_HOUR SECSPERHOUR 187#define SECS_PER_DAY SECSPERDAY 188#define MONS_PER_YEAR MONSPERYEAR 189 190#endif /* !defined USG */ 191 192#endif /* !defined TZFILE_H */ 193