1 /** $MirOS: src/lib/libc/time/tzfile.h,v 1.3 2005/09/22 20:33:02 tg Exp $ */ 2 /* $OpenBSD: tzfile.h,v 1.6 2005/07/05 13:40:51 millert Exp $ */ 3 4 #ifndef TZFILE_H 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 (arthur_david_olson@nih.gov). 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 #if 0 25 #ifndef lint 26 #ifndef NOID 27 static char tzfilehid[] = "@(#)tzfile.h 7.17"; 28 #endif /* !defined NOID */ 29 #endif /* !defined lint */ 30 #endif 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 54 struct 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 128 /* 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 #define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0)) 164 165 /* 166 ** Since everything in isleap is modulo 400 (or a factor of 400), we know that 167 ** isleap(y) == isleap(y % 400) 168 ** and so 169 ** isleap(a + b) == isleap((a + b) % 400) 170 ** or 171 ** isleap(a + b) == isleap(a % 400 + b % 400) 172 ** This is true even if % means modulo rather than Fortran remainder 173 ** (which is allowed by C89 but not C99). 174 ** We use this to avoid addition overflow problems. 175 */ 176 177 #define isleap_sum(a, b) isleap((a) % 400 + (b) % 400) 178 179 #endif /* !defined TZFILE_H */ 180