1#ifndef TZFILE_H 2 3#define TZFILE_H 4 5/* 6** This file is in the public domain, so clarified as of 7** 1996-06-05 by Arthur David Olson. 8*/ 9 10/* 11** This header is for use ONLY with the time conversion code. 12** There is no guarantee that it will remain unchanged, 13** or that it will remain at all. 14** Do NOT copy it to any system include directory. 15** Thank you! 16*/ 17 18/* 19** ID 20*/ 21 22#ifndef lint 23#ifndef NOID 24static char tzfilehid[] = "@(#)tzfile.h 8.1"; 25#endif /* !defined NOID */ 26#endif /* !defined lint */ 27 28/* 29** Information about time zone files. 30*/ 31 32#ifndef TZDIR 33#define TZDIR "/usr/local/etc/zoneinfo" /* Time zone object file directory */ 34#endif /* !defined TZDIR */ 35 36#ifndef TZDEFAULT 37#define TZDEFAULT "localtime" 38#endif /* !defined TZDEFAULT */ 39 40#ifndef TZDEFRULES 41#define TZDEFRULES "posixrules" 42#endif /* !defined TZDEFRULES */ 43 44/* 45** Each file begins with. . . 46*/ 47 48#define TZ_MAGIC "TZif" 49 50struct tzhead { 51 char tzh_magic[4]; /* TZ_MAGIC */ 52 char tzh_version[1]; /* '\0' or '2' as of 2005 */ 53 char tzh_reserved[15]; /* reserved--must be zero */ 54 char tzh_ttisgmtcnt[4]; /* coded number of trans. time flags */ 55 char tzh_ttisstdcnt[4]; /* coded number of trans. time flags */ 56 char tzh_leapcnt[4]; /* coded number of leap seconds */ 57 char tzh_timecnt[4]; /* coded number of transition times */ 58 char tzh_typecnt[4]; /* coded number of local time types */ 59 char tzh_charcnt[4]; /* coded number of abbr. chars */ 60}; 61 62/* 63** . . .followed by. . . 64** 65** tzh_timecnt (char [4])s coded transition times a la time(2) 66** tzh_timecnt (unsigned char)s types of local time starting at above 67** tzh_typecnt repetitions of 68** one (char [4]) coded UTC offset in seconds 69** one (unsigned char) used to set tm_isdst 70** one (unsigned char) that's an abbreviation list index 71** tzh_charcnt (char)s '\0'-terminated zone abbreviations 72** tzh_leapcnt repetitions of 73** one (char [4]) coded leap second transition times 74** one (char [4]) total correction after above 75** tzh_ttisstdcnt (char)s indexed by type; if TRUE, transition 76** time is standard time, if FALSE, 77** transition time is wall clock time 78** if absent, transition times are 79** assumed to be wall clock time 80** tzh_ttisgmtcnt (char)s indexed by type; if TRUE, transition 81** time is UTC, if FALSE, 82** transition time is local time 83** if absent, transition times are 84** assumed to be local time 85*/ 86 87/* 88** If tzh_version is '2' or greater, the above is followed by a second instance 89** of tzhead and a second instance of the data in which each coded transition 90** time uses 8 rather than 4 chars, 91** then a POSIX-TZ-environment-variable-style string for use in handling 92** instants after the last transition time stored in the file 93** (with nothing between the newlines if there is no POSIX representation for 94** such instants). 95*/ 96 97/* 98** In the current implementation, "tzset()" refuses to deal with files that 99** exceed any of the limits below. 100*/ 101 102#ifndef TZ_MAX_TIMES 103#define TZ_MAX_TIMES 1200 104#endif /* !defined TZ_MAX_TIMES */ 105 106#ifndef TZ_MAX_TYPES 107#ifndef NOSOLAR 108#define TZ_MAX_TYPES 256 /* Limited by what (unsigned char)'s can hold */ 109#endif /* !defined NOSOLAR */ 110#ifdef NOSOLAR 111/* 112** Must be at least 14 for Europe/Riga as of Jan 12 1995, 113** as noted by Earl Chew. 114*/ 115#define TZ_MAX_TYPES 20 /* Maximum number of local time types */ 116#endif /* !defined NOSOLAR */ 117#endif /* !defined TZ_MAX_TYPES */ 118 119#ifndef TZ_MAX_CHARS 120#define TZ_MAX_CHARS 50 /* Maximum number of abbreviation characters */ 121 /* (limited by what unsigned chars can hold) */ 122#endif /* !defined TZ_MAX_CHARS */ 123 124#ifndef TZ_MAX_LEAPS 125#define TZ_MAX_LEAPS 50 /* Maximum number of leap second corrections */ 126#endif /* !defined TZ_MAX_LEAPS */ 127 128#define SECSPERMIN 60 129#define MINSPERHOUR 60 130#define HOURSPERDAY 24 131#define DAYSPERWEEK 7 132#define DAYSPERNYEAR 365 133#define DAYSPERLYEAR 366 134#define SECSPERHOUR (SECSPERMIN * MINSPERHOUR) 135#define SECSPERDAY ((long) SECSPERHOUR * HOURSPERDAY) 136#define MONSPERYEAR 12 137 138#define TM_SUNDAY 0 139#define TM_MONDAY 1 140#define TM_TUESDAY 2 141#define TM_WEDNESDAY 3 142#define TM_THURSDAY 4 143#define TM_FRIDAY 5 144#define TM_SATURDAY 6 145 146#define TM_JANUARY 0 147#define TM_FEBRUARY 1 148#define TM_MARCH 2 149#define TM_APRIL 3 150#define TM_MAY 4 151#define TM_JUNE 5 152#define TM_JULY 6 153#define TM_AUGUST 7 154#define TM_SEPTEMBER 8 155#define TM_OCTOBER 9 156#define TM_NOVEMBER 10 157#define TM_DECEMBER 11 158 159#define TM_YEAR_BASE 1900 160 161#define EPOCH_YEAR 1970 162#define EPOCH_WDAY TM_THURSDAY 163 164#define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0)) 165 166/* 167** Since everything in isleap is modulo 400 (or a factor of 400), we know that 168** isleap(y) == isleap(y % 400) 169** and so 170** isleap(a + b) == isleap((a + b) % 400) 171** or 172** isleap(a + b) == isleap(a % 400 + b % 400) 173** This is true even if % means modulo rather than Fortran remainder 174** (which is allowed by C89 but not C99). 175** We use this to avoid addition overflow problems. 176*/ 177 178#define isleap_sum(a, b) isleap((a) % 400 + (b) % 400) 179 180#endif /* !defined TZFILE_H */ 181