1 /* 2 * Copyright (c) 1988, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Arthur David Olson of the National Cancer Institute. 7 * 8 * %sccs.include.redist.c% 9 * 10 * @(#)tzfile.h 8.1 (Berkeley) 06/02/93 11 */ 12 13 #ifndef _TZFILE_H_ 14 #define _TZFILE_H_ 15 16 /* 17 * Information about time zone files. 18 */ 19 /* Time zone object file directory */ 20 #define TZDIR "/usr/share/zoneinfo" 21 #define TZDEFAULT "/etc/localtime" 22 #define TZDEFRULES "posixrules" 23 24 /* 25 ** Each file begins with. . . 26 */ 27 28 struct tzhead { 29 char tzh_reserved[24]; /* reserved for future use */ 30 char tzh_ttisstdcnt[4]; /* coded number of trans. time flags */ 31 char tzh_leapcnt[4]; /* coded number of leap seconds */ 32 char tzh_timecnt[4]; /* coded number of transition times */ 33 char tzh_typecnt[4]; /* coded number of local time types */ 34 char tzh_charcnt[4]; /* coded number of abbr. chars */ 35 }; 36 37 /* 38 ** . . .followed by. . . 39 ** 40 ** tzh_timecnt (char [4])s coded transition times a la time(2) 41 ** tzh_timecnt (unsigned char)s types of local time starting at above 42 ** tzh_typecnt repetitions of 43 ** one (char [4]) coded GMT offset in seconds 44 ** one (unsigned char) used to set tm_isdst 45 ** one (unsigned char) that's an abbreviation list index 46 ** tzh_charcnt (char)s '\0'-terminated zone abbreviations 47 ** tzh_leapcnt repetitions of 48 ** one (char [4]) coded leap second transition times 49 ** one (char [4]) total correction after above 50 ** tzh_ttisstdcnt (char)s indexed by type; if TRUE, transition 51 ** time is standard time, if FALSE, 52 ** transition time is wall clock time 53 ** if absent, transition times are 54 ** assumed to be wall clock time 55 */ 56 57 /* 58 ** In the current implementation, "tzset()" refuses to deal with files that 59 ** exceed any of the limits below. 60 */ 61 62 /* 63 ** The TZ_MAX_TIMES value below is enough to handle a bit more than a 64 ** year's worth of solar time (corrected daily to the nearest second) or 65 ** 138 years of Pacific Presidential Election time 66 ** (where there are three time zone transitions every fourth year). 67 */ 68 #define TZ_MAX_TIMES 370 69 70 #define NOSOLAR /* 4BSD doesn't currently handle solar time */ 71 72 #ifndef NOSOLAR 73 #define TZ_MAX_TYPES 256 /* Limited by what (unsigned char)'s can hold */ 74 #else 75 #define TZ_MAX_TYPES 10 /* Maximum number of local time types */ 76 #endif 77 78 #define TZ_MAX_CHARS 50 /* Maximum number of abbreviation characters */ 79 80 #define TZ_MAX_LEAPS 50 /* Maximum number of leap second corrections */ 81 82 #define SECSPERMIN 60 83 #define MINSPERHOUR 60 84 #define HOURSPERDAY 24 85 #define DAYSPERWEEK 7 86 #define DAYSPERNYEAR 365 87 #define DAYSPERLYEAR 366 88 #define SECSPERHOUR (SECSPERMIN * MINSPERHOUR) 89 #define SECSPERDAY ((long) SECSPERHOUR * HOURSPERDAY) 90 #define MONSPERYEAR 12 91 92 #define TM_SUNDAY 0 93 #define TM_MONDAY 1 94 #define TM_TUESDAY 2 95 #define TM_WEDNESDAY 3 96 #define TM_THURSDAY 4 97 #define TM_FRIDAY 5 98 #define TM_SATURDAY 6 99 100 #define TM_JANUARY 0 101 #define TM_FEBRUARY 1 102 #define TM_MARCH 2 103 #define TM_APRIL 3 104 #define TM_MAY 4 105 #define TM_JUNE 5 106 #define TM_JULY 6 107 #define TM_AUGUST 7 108 #define TM_SEPTEMBER 8 109 #define TM_OCTOBER 9 110 #define TM_NOVEMBER 10 111 #define TM_DECEMBER 11 112 113 #define TM_YEAR_BASE 1900 114 115 #define EPOCH_YEAR 1970 116 #define EPOCH_WDAY TM_THURSDAY 117 118 /* 119 ** Accurate only for the past couple of centuries; 120 ** that will probably do. 121 */ 122 123 #define isleap(y) (((y) % 4) == 0 && ((y) % 100) != 0 || ((y) % 400) == 0) 124 125 #endif /* !_TZFILE_H_ */ 126