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: head/contrib/tzcode/stdtime/tzfile.h 192625 2009-05-23 06:31:50Z edwin $ 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 /* 27 static 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 54 struct 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