1/* $OpenBSD: tzfile.h,v 1.9 2012/09/13 11:14:20 millert Exp $ */ 2 3#ifndef TZFILE_H 4 5#define TZFILE_H 6 7/* 8** This file is in the public domain, so clarified as of 9** 1996-06-05 by Arthur David Olson. 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** Information about time zone files. 22*/ 23 24#ifndef TZDIR 25#define TZDIR "/usr/share/zoneinfo" /* Time zone object file directory */ 26#endif /* !defined TZDIR */ 27 28#ifndef TZDEFAULT 29#define TZDEFAULT "/etc/localtime" 30#endif /* !defined TZDEFAULT */ 31 32#ifndef TZDEFRULES 33#define TZDEFRULES "posixrules" 34#endif /* !defined TZDEFRULES */ 35 36/* 37** Each file begins with. . . 38*/ 39 40#define TZ_MAGIC "TZif" 41 42struct tzhead { 43 char tzh_magic[4]; /* TZ_MAGIC */ 44 char tzh_version[1]; /* '\0' or '2' as of 2005 */ 45 char tzh_reserved[15]; /* reserved--must be zero */ 46 char tzh_ttisgmtcnt[4]; /* coded number of trans. time flags */ 47 char tzh_ttisstdcnt[4]; /* coded number of trans. time flags */ 48 char tzh_leapcnt[4]; /* coded number of leap seconds */ 49 char tzh_timecnt[4]; /* coded number of transition times */ 50 char tzh_typecnt[4]; /* coded number of local time types */ 51 char tzh_charcnt[4]; /* coded number of abbr. chars */ 52}; 53 54/* 55** . . .followed by. . . 56** 57** tzh_timecnt (char [4])s coded transition times a la time(2) 58** tzh_timecnt (unsigned char)s types of local time starting at above 59** tzh_typecnt repetitions of 60** one (char [4]) coded UTC offset in seconds 61** one (unsigned char) used to set tm_isdst 62** one (unsigned char) that's an abbreviation list index 63** tzh_charcnt (char)s '\0'-terminated zone abbreviations 64** tzh_leapcnt repetitions of 65** one (char [4]) coded leap second transition times 66** one (char [4]) total correction after above 67** tzh_ttisstdcnt (char)s indexed by type; if TRUE, transition 68** time is standard time, if FALSE, 69** transition time is wall clock time 70** if absent, transition times are 71** assumed to be wall clock time 72** tzh_ttisgmtcnt (char)s indexed by type; if TRUE, transition 73** time is UTC, if FALSE, 74** transition time is local time 75** if absent, transition times are 76** assumed to be local time 77*/ 78 79/* 80** If tzh_version is '2' or greater, the above is followed by a second instance 81** of tzhead and a second instance of the data in which each coded transition 82** time uses 8 rather than 4 chars, 83** then a POSIX-TZ-environment-variable-style string for use in handling 84** instants after the last transition time stored in the file 85** (with nothing between the newlines if there is no POSIX representation for 86** such instants). 87*/ 88 89/* 90** In the current implementation, "tzset()" refuses to deal with files that 91** exceed any of the limits below. 92*/ 93 94#ifndef TZ_MAX_TIMES 95#define TZ_MAX_TIMES 1200 96#endif /* !defined TZ_MAX_TIMES */ 97 98#ifndef TZ_MAX_TYPES 99#ifndef NOSOLAR 100#define TZ_MAX_TYPES 256 /* Limited by what (unsigned char)'s can hold */ 101#endif /* !defined NOSOLAR */ 102#ifdef NOSOLAR 103/* 104** Must be at least 14 for Europe/Riga as of Jan 12 1995, 105** as noted by Earl Chew. 106*/ 107#define TZ_MAX_TYPES 20 /* Maximum number of local time types */ 108#endif /* !defined NOSOLAR */ 109#endif /* !defined TZ_MAX_TYPES */ 110 111#ifndef TZ_MAX_CHARS 112#define TZ_MAX_CHARS 50 /* Maximum number of abbreviation characters */ 113 /* (limited by what unsigned chars can hold) */ 114#endif /* !defined TZ_MAX_CHARS */ 115 116#ifndef TZ_MAX_LEAPS 117#define TZ_MAX_LEAPS 50 /* Maximum number of leap second corrections */ 118#endif /* !defined TZ_MAX_LEAPS */ 119 120#define SECSPERMIN 60 121#define MINSPERHOUR 60 122#define HOURSPERDAY 24 123#define DAYSPERWEEK 7 124#define DAYSPERNYEAR 365 125#define DAYSPERLYEAR 366 126#define SECSPERHOUR (SECSPERMIN * MINSPERHOUR) 127#define SECSPERDAY ((long) SECSPERHOUR * HOURSPERDAY) 128#define MONSPERYEAR 12 129 130#define TM_SUNDAY 0 131#define TM_MONDAY 1 132#define TM_TUESDAY 2 133#define TM_WEDNESDAY 3 134#define TM_THURSDAY 4 135#define TM_FRIDAY 5 136#define TM_SATURDAY 6 137 138#define TM_JANUARY 0 139#define TM_FEBRUARY 1 140#define TM_MARCH 2 141#define TM_APRIL 3 142#define TM_MAY 4 143#define TM_JUNE 5 144#define TM_JULY 6 145#define TM_AUGUST 7 146#define TM_SEPTEMBER 8 147#define TM_OCTOBER 9 148#define TM_NOVEMBER 10 149#define TM_DECEMBER 11 150 151#define TM_YEAR_BASE 1900 152 153#define EPOCH_YEAR 1970 154#define EPOCH_WDAY TM_THURSDAY 155 156#define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0)) 157 158/* 159** Since everything in isleap is modulo 400 (or a factor of 400), we know that 160** isleap(y) == isleap(y % 400) 161** and so 162** isleap(a + b) == isleap((a + b) % 400) 163** or 164** isleap(a + b) == isleap(a % 400 + b % 400) 165** This is true even if % means modulo rather than Fortran remainder 166** (which is allowed by C89 but not C99). 167** We use this to avoid addition overflow problems. 168*/ 169 170#define isleap_sum(a, b) isleap((a) % 400 + (b) % 400) 171 172#endif /* !defined TZFILE_H */ 173