The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 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 | /* |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 19 | ** Information about time zone files. |
| 20 | */ |
| 21 | |
| 22 | #ifndef TZDIR |
Elliott Hughes | ce4783c | 2013-07-12 17:31:11 -0700 | [diff] [blame] | 23 | #define TZDIR "/usr/local/etc/zoneinfo" /* Time zone object file directory */ |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 24 | #endif /* !defined TZDIR */ |
| 25 | |
| 26 | #ifndef TZDEFAULT |
Elliott Hughes | ce4783c | 2013-07-12 17:31:11 -0700 | [diff] [blame] | 27 | #define TZDEFAULT "localtime" |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 28 | #endif /* !defined TZDEFAULT */ |
| 29 | |
| 30 | #ifndef TZDEFRULES |
Elliott Hughes | ce4783c | 2013-07-12 17:31:11 -0700 | [diff] [blame] | 31 | #define TZDEFRULES "posixrules" |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 32 | #endif /* !defined TZDEFRULES */ |
| 33 | |
| 34 | /* |
| 35 | ** Each file begins with. . . |
| 36 | */ |
| 37 | |
Elliott Hughes | ce4783c | 2013-07-12 17:31:11 -0700 | [diff] [blame] | 38 | #define TZ_MAGIC "TZif" |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 39 | |
| 40 | struct tzhead { |
Elliott Hughes | ce4783c | 2013-07-12 17:31:11 -0700 | [diff] [blame] | 41 | char tzh_magic[4]; /* TZ_MAGIC */ |
Elliott Hughes | e0d0b15 | 2013-09-27 00:04:30 -0700 | [diff] [blame] | 42 | char tzh_version[1]; /* '\0' or '2' or '3' as of 2013 */ |
Elliott Hughes | ce4783c | 2013-07-12 17:31:11 -0700 | [diff] [blame] | 43 | char tzh_reserved[15]; /* reserved--must be zero */ |
| 44 | char tzh_ttisgmtcnt[4]; /* coded number of trans. time flags */ |
| 45 | char tzh_ttisstdcnt[4]; /* coded number of trans. time flags */ |
| 46 | char tzh_leapcnt[4]; /* coded number of leap seconds */ |
| 47 | char tzh_timecnt[4]; /* coded number of transition times */ |
| 48 | char tzh_typecnt[4]; /* coded number of local time types */ |
| 49 | char tzh_charcnt[4]; /* coded number of abbr. chars */ |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 50 | }; |
| 51 | |
| 52 | /* |
| 53 | ** . . .followed by. . . |
| 54 | ** |
Elliott Hughes | ce4783c | 2013-07-12 17:31:11 -0700 | [diff] [blame] | 55 | ** tzh_timecnt (char [4])s coded transition times a la time(2) |
| 56 | ** tzh_timecnt (unsigned char)s types of local time starting at above |
| 57 | ** tzh_typecnt repetitions of |
Elliott Hughes | e0d0b15 | 2013-09-27 00:04:30 -0700 | [diff] [blame] | 58 | ** one (char [4]) coded UT offset in seconds |
Elliott Hughes | ce4783c | 2013-07-12 17:31:11 -0700 | [diff] [blame] | 59 | ** one (unsigned char) used to set tm_isdst |
| 60 | ** one (unsigned char) that's an abbreviation list index |
| 61 | ** tzh_charcnt (char)s '\0'-terminated zone abbreviations |
| 62 | ** tzh_leapcnt repetitions of |
| 63 | ** one (char [4]) coded leap second transition times |
| 64 | ** one (char [4]) total correction after above |
| 65 | ** tzh_ttisstdcnt (char)s indexed by type; if TRUE, transition |
| 66 | ** time is standard time, if FALSE, |
| 67 | ** transition time is wall clock time |
| 68 | ** if absent, transition times are |
| 69 | ** assumed to be wall clock time |
| 70 | ** tzh_ttisgmtcnt (char)s indexed by type; if TRUE, transition |
Elliott Hughes | e0d0b15 | 2013-09-27 00:04:30 -0700 | [diff] [blame] | 71 | ** time is UT, if FALSE, |
Elliott Hughes | ce4783c | 2013-07-12 17:31:11 -0700 | [diff] [blame] | 72 | ** transition time is local time |
| 73 | ** if absent, transition times are |
| 74 | ** assumed to be local time |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 75 | */ |
| 76 | |
| 77 | /* |
| 78 | ** If tzh_version is '2' or greater, the above is followed by a second instance |
| 79 | ** of tzhead and a second instance of the data in which each coded transition |
| 80 | ** time uses 8 rather than 4 chars, |
| 81 | ** then a POSIX-TZ-environment-variable-style string for use in handling |
| 82 | ** instants after the last transition time stored in the file |
| 83 | ** (with nothing between the newlines if there is no POSIX representation for |
| 84 | ** such instants). |
Elliott Hughes | e0d0b15 | 2013-09-27 00:04:30 -0700 | [diff] [blame] | 85 | ** |
| 86 | ** If tz_version is '3' or greater, the above is extended as follows. |
| 87 | ** First, the POSIX TZ string's hour offset may range from -167 |
| 88 | ** through 167 as compared to the POSIX-required 0 through 24. |
| 89 | ** Second, its DST start time may be January 1 at 00:00 and its stop |
| 90 | ** time December 31 at 24:00 plus the difference between DST and |
| 91 | ** standard time, indicating DST all year. |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 92 | */ |
| 93 | |
| 94 | /* |
| 95 | ** In the current implementation, "tzset()" refuses to deal with files that |
| 96 | ** exceed any of the limits below. |
| 97 | */ |
| 98 | |
| 99 | #ifndef TZ_MAX_TIMES |
Elliott Hughes | ce4783c | 2013-07-12 17:31:11 -0700 | [diff] [blame] | 100 | #define TZ_MAX_TIMES 1200 |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 101 | #endif /* !defined TZ_MAX_TIMES */ |
| 102 | |
| 103 | #ifndef TZ_MAX_TYPES |
Calin Juravle | 627d37c | 2014-02-28 11:46:03 +0000 | [diff] [blame] | 104 | /* This must be at least 17 for Europe/Samara and Europe/Vilnius. */ |
Elliott Hughes | ce4783c | 2013-07-12 17:31:11 -0700 | [diff] [blame] | 105 | #define TZ_MAX_TYPES 256 /* Limited by what (unsigned char)'s can hold */ |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 106 | #endif /* !defined TZ_MAX_TYPES */ |
| 107 | |
| 108 | #ifndef TZ_MAX_CHARS |
Elliott Hughes | ce4783c | 2013-07-12 17:31:11 -0700 | [diff] [blame] | 109 | #define TZ_MAX_CHARS 50 /* Maximum number of abbreviation characters */ |
| 110 | /* (limited by what unsigned chars can hold) */ |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 111 | #endif /* !defined TZ_MAX_CHARS */ |
| 112 | |
| 113 | #ifndef TZ_MAX_LEAPS |
Elliott Hughes | ce4783c | 2013-07-12 17:31:11 -0700 | [diff] [blame] | 114 | #define TZ_MAX_LEAPS 50 /* Maximum number of leap second corrections */ |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 115 | #endif /* !defined TZ_MAX_LEAPS */ |
| 116 | |
Elliott Hughes | ce4783c | 2013-07-12 17:31:11 -0700 | [diff] [blame] | 117 | #define SECSPERMIN 60 |
| 118 | #define MINSPERHOUR 60 |
| 119 | #define HOURSPERDAY 24 |
| 120 | #define DAYSPERWEEK 7 |
| 121 | #define DAYSPERNYEAR 365 |
| 122 | #define DAYSPERLYEAR 366 |
| 123 | #define SECSPERHOUR (SECSPERMIN * MINSPERHOUR) |
| 124 | #define SECSPERDAY ((int_fast32_t) SECSPERHOUR * HOURSPERDAY) |
| 125 | #define MONSPERYEAR 12 |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 126 | |
Elliott Hughes | ce4783c | 2013-07-12 17:31:11 -0700 | [diff] [blame] | 127 | #define TM_SUNDAY 0 |
| 128 | #define TM_MONDAY 1 |
| 129 | #define TM_TUESDAY 2 |
| 130 | #define TM_WEDNESDAY 3 |
| 131 | #define TM_THURSDAY 4 |
| 132 | #define TM_FRIDAY 5 |
| 133 | #define TM_SATURDAY 6 |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 134 | |
Elliott Hughes | ce4783c | 2013-07-12 17:31:11 -0700 | [diff] [blame] | 135 | #define TM_JANUARY 0 |
| 136 | #define TM_FEBRUARY 1 |
| 137 | #define TM_MARCH 2 |
| 138 | #define TM_APRIL 3 |
| 139 | #define TM_MAY 4 |
| 140 | #define TM_JUNE 5 |
| 141 | #define TM_JULY 6 |
| 142 | #define TM_AUGUST 7 |
| 143 | #define TM_SEPTEMBER 8 |
| 144 | #define TM_OCTOBER 9 |
| 145 | #define TM_NOVEMBER 10 |
| 146 | #define TM_DECEMBER 11 |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 147 | |
Elliott Hughes | ce4783c | 2013-07-12 17:31:11 -0700 | [diff] [blame] | 148 | #define TM_YEAR_BASE 1900 |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 149 | |
Elliott Hughes | ce4783c | 2013-07-12 17:31:11 -0700 | [diff] [blame] | 150 | #define EPOCH_YEAR 1970 |
| 151 | #define EPOCH_WDAY TM_THURSDAY |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 152 | |
| 153 | #define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0)) |
| 154 | |
| 155 | /* |
| 156 | ** Since everything in isleap is modulo 400 (or a factor of 400), we know that |
Elliott Hughes | ce4783c | 2013-07-12 17:31:11 -0700 | [diff] [blame] | 157 | ** isleap(y) == isleap(y % 400) |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 158 | ** and so |
Elliott Hughes | ce4783c | 2013-07-12 17:31:11 -0700 | [diff] [blame] | 159 | ** isleap(a + b) == isleap((a + b) % 400) |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 160 | ** or |
Elliott Hughes | ce4783c | 2013-07-12 17:31:11 -0700 | [diff] [blame] | 161 | ** isleap(a + b) == isleap(a % 400 + b % 400) |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 162 | ** This is true even if % means modulo rather than Fortran remainder |
| 163 | ** (which is allowed by C89 but not C99). |
| 164 | ** We use this to avoid addition overflow problems. |
| 165 | */ |
| 166 | |
Elliott Hughes | ce4783c | 2013-07-12 17:31:11 -0700 | [diff] [blame] | 167 | #define isleap_sum(a, b) isleap((a) % 400 + (b) % 400) |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 168 | |
| 169 | #endif /* !defined TZFILE_H */ |