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 ** Information about time zone files. 22 */ 23 24 #ifndef TZDIR 25 #define TZDIR "/usr/share/zoneinfo" /* Time zone object file directory */ 26 #endif /* !defined TZDIR */ 27 28 #ifndef TZDEFAULT 29 #define TZDEFAULT "/etc/localtime" 30 #endif /* !defined TZDEFAULT */ 31 32 #ifndef TZDEFRULES 33 #define TZDEFRULES "posixrules" 34 #endif /* !defined TZDEFRULES */ 35 36 /* 37 ** Each file begins with. . . 38 */ 39 40 #define TZ_MAGIC "TZif" 41 42 struct tzhead { 43 char tzh_magic[4]; /* TZ_MAGIC */ 44 char tzh_version[1]; /* '\0' or '2' or '3' as of 2013 */ 45 char tzh_reserved[15]; /* reserved--must be zero */ 46 char tzh_ttisgmtcnt[4]; /* coded number of trans. time flags */ 47 char tzh_ttisstdcnt[4]; /* coded number of trans. time flags */ 48 char tzh_leapcnt[4]; /* coded number of leap seconds */ 49 char tzh_timecnt[4]; /* coded number of transition times */ 50 char tzh_typecnt[4]; /* coded number of local time types */ 51 char tzh_charcnt[4]; /* coded number of abbr. chars */ 52 }; 53 54 /* 55 ** . . .followed by. . . 56 ** 57 ** tzh_timecnt (char [4])s coded transition times a la time(2) 58 ** tzh_timecnt (unsigned char)s types of local time starting at above 59 ** tzh_typecnt repetitions of 60 ** one (char [4]) coded UT offset in seconds 61 ** one (unsigned char) used to set tm_isdst 62 ** one (unsigned char) that's an abbreviation list index 63 ** tzh_charcnt (char)s '\0'-terminated zone abbreviations 64 ** tzh_leapcnt repetitions of 65 ** one (char [4]) coded leap second transition times 66 ** one (char [4]) total correction after above 67 ** tzh_ttisstdcnt (char)s indexed by type; if TRUE, transition 68 ** time is standard time, if FALSE, 69 ** transition time is wall clock time 70 ** if absent, transition times are 71 ** assumed to be wall clock time 72 ** tzh_ttisgmtcnt (char)s indexed by type; if TRUE, transition 73 ** time is UT, if FALSE, 74 ** transition time is local time 75 ** if absent, transition times are 76 ** assumed to be local time 77 */ 78 79 /* 80 ** If tzh_version is '2' or greater, the above is followed by a second instance 81 ** of tzhead and a second instance of the data in which each coded transition 82 ** time uses 8 rather than 4 chars, 83 ** then a POSIX-TZ-environment-variable-style string for use in handling 84 ** instants after the last transition time stored in the file 85 ** (with nothing between the newlines if there is no POSIX representation for 86 ** such instants). 87 ** 88 ** If tz_version is '3' or greater, the above is extended as follows. 89 ** First, the POSIX TZ string's hour offset may range from -167 90 ** through 167 as compared to the POSIX-required 0 through 24. 91 ** Second, its DST start time may be January 1 at 00:00 and its stop 92 ** time December 31 at 24:00 plus the difference between DST and 93 ** standard time, indicating DST all year. 94 */ 95 96 /* 97 ** In the current implementation, "tzset()" refuses to deal with files that 98 ** exceed any of the limits below. 99 */ 100 101 #ifndef TZ_MAX_TIMES 102 #define TZ_MAX_TIMES 1200 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. 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 50 /* 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 ((int_fast32_t) 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