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. 8** 9** $FreeBSD$ 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 8.1"; 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_version[1]; /* '\0' or '2' as of 2005 */ 57 char tzh_reserved[15]; /* reserved--must be zero */ 58 char tzh_ttisgmtcnt[4]; /* coded number of trans. time flags */ 59 char tzh_ttisstdcnt[4]; /* coded number of trans. time flags */ 60 char tzh_leapcnt[4]; /* coded number of leap seconds */ 61 char tzh_timecnt[4]; /* coded number of transition times */ 62 char tzh_typecnt[4]; /* coded number of local time types */ 63 char tzh_charcnt[4]; /* coded number of abbr. chars */ 64}; 65 66/* 67** . . .followed by. . . 68** 69** tzh_timecnt (char [4])s coded transition times a la time(2) 70** tzh_timecnt (unsigned char)s types of local time starting at above 71** tzh_typecnt repetitions of 72** one (char [4]) coded UTC offset in seconds 73** one (unsigned char) used to set tm_isdst 74** one (unsigned char) that's an abbreviation list index 75** tzh_charcnt (char)s '\0'-terminated zone abbreviations 76** tzh_leapcnt repetitions of 77** one (char [4]) coded leap second transition times 78** one (char [4]) total correction after above 79** tzh_ttisstdcnt (char)s indexed by type; if TRUE, transition 80** time is standard time, if FALSE, 81** transition time is wall clock time 82** if absent, transition times are 83** assumed to be wall clock time 84** tzh_ttisgmtcnt (char)s indexed by type; if TRUE, transition 85** time is UTC, if FALSE, 86** transition time is local time 87** if absent, transition times are 88** assumed to be local time 89*/ 90 91/* 92** If tzh_version is '2' or greater, the above is followed by a second instance 93** of tzhead and a second instance of the data in which each coded transition 94** time uses 8 rather than 4 chars, 95** then a POSIX-TZ-environment-variable-style string for use in handling 96** instants after the last transition time stored in the file 97** (with nothing between the newlines if there is no POSIX representation for 98** such instants). 99*/ 100 101/* 102** In the current implementation, "tzset()" refuses to deal with files that 103** exceed any of the limits below. 104*/ 105 106#ifndef TZ_MAX_TIMES 107#define TZ_MAX_TIMES 1200 108#endif /* !defined TZ_MAX_TIMES */ 109 110#ifndef TZ_MAX_TYPES 111#ifndef NOSOLAR 112#define TZ_MAX_TYPES 256 /* Limited by what (unsigned char)'s can hold */ 113#endif /* !defined NOSOLAR */ 114#ifdef NOSOLAR 115/* 116** Must be at least 14 for Europe/Riga as of Jan 12 1995, 117** as noted by Earl Chew. 118*/ 119#define TZ_MAX_TYPES 20 /* Maximum number of local time types */ 120#endif /* !defined NOSOLAR */ 121#endif /* !defined TZ_MAX_TYPES */ 122 123#ifndef TZ_MAX_CHARS 124#define TZ_MAX_CHARS 50 /* Maximum number of abbreviation characters */ 125 /* (limited by what unsigned chars can hold) */ 126#endif /* !defined TZ_MAX_CHARS */ 127 128#ifndef TZ_MAX_LEAPS 129#define TZ_MAX_LEAPS 50 /* Maximum number of leap second corrections */ 130#endif /* !defined TZ_MAX_LEAPS */ 131 132#define SECSPERMIN 60 133#define MINSPERHOUR 60 134#define HOURSPERDAY 24 135#define DAYSPERWEEK 7 136#define DAYSPERNYEAR 365 137#define DAYSPERLYEAR 366 138#define SECSPERHOUR (SECSPERMIN * MINSPERHOUR) 139#define SECSPERDAY ((long) SECSPERHOUR * HOURSPERDAY) 140#define MONSPERYEAR 12 141 142#define TM_SUNDAY 0 143#define TM_MONDAY 1 144#define TM_TUESDAY 2 145#define TM_WEDNESDAY 3 146#define TM_THURSDAY 4 147#define TM_FRIDAY 5 148#define TM_SATURDAY 6 149 150#define TM_JANUARY 0 151#define TM_FEBRUARY 1 152#define TM_MARCH 2 153#define TM_APRIL 3 154#define TM_MAY 4 155#define TM_JUNE 5 156#define TM_JULY 6 157#define TM_AUGUST 7 158#define TM_SEPTEMBER 8 159#define TM_OCTOBER 9 160#define TM_NOVEMBER 10 161#define TM_DECEMBER 11 162 163#define TM_YEAR_BASE 1900 164 165#define EPOCH_YEAR 1970 166#define EPOCH_WDAY TM_THURSDAY 167 168#define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0)) 169 170/* 171** Since everything in isleap is modulo 400 (or a factor of 400), we know that 172** isleap(y) == isleap(y % 400) 173** and so 174** isleap(a + b) == isleap((a + b) % 400) 175** or 176** isleap(a + b) == isleap(a % 400 + b % 400) 177** This is true even if % means modulo rather than Fortran remainder 178** (which is allowed by C89 but not C99). 179** We use this to avoid addition overflow problems. 180*/ 181 182#define isleap_sum(a, b) isleap((a) % 400 + (b) % 400) 183 184#endif /* !defined TZFILE_H */ 185