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| 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 | +/* |
| 19 | +** Information about time zone files. |
| 20 | +*/ |
| 21 | + |
| 22 | +#ifndef TZDIR |
| 23 | +#define TZDIR "/usr/local/etc/zoneinfo" /* Time zone object file directory */ |
| 24 | +#endif /* !defined TZDIR */ |
| 25 | + |
| 26 | +#ifndef TZDEFAULT |
| 27 | +#define TZDEFAULT "localtime" |
| 28 | +#endif /* !defined TZDEFAULT */ |
| 29 | + |
| 30 | +#ifndef TZDEFRULES |
| 31 | +#define TZDEFRULES "posixrules" |
| 32 | +#endif /* !defined TZDEFRULES */ |
| 33 | + |
| 34 | +/* |
| 35 | +** Each file begins with. . . |
| 36 | +*/ |
| 37 | + |
| 38 | +#define TZ_MAGIC "TZif" |
| 39 | + |
| 40 | +struct tzhead { |
| 41 | + char tzh_magic[4]; /* TZ_MAGIC */ |
| 42 | + char tzh_version[1]; /* '\0' or '2' or '3' as of 2013 */ |
| 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 */ |
| 50 | +}; |
| 51 | + |
| 52 | +/* |
| 53 | +** . . .followed by. . . |
| 54 | +** |
| 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 |
| 58 | +** one (char [4]) coded UT offset in seconds |
| 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 |
| 71 | +** time is UT, if false, |
| 72 | +** transition time is local time |
| 73 | +** if absent, transition times are |
| 74 | +** assumed to be local time |
| 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). |
| 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. |
| 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 |
| 100 | +#define TZ_MAX_TIMES 2000 |
| 101 | +#endif /* !defined TZ_MAX_TIMES */ |
| 102 | + |
| 103 | +#ifndef TZ_MAX_TYPES |
| 104 | +/* This must be at least 17 for Europe/Samara and Europe/Vilnius. */ |
| 105 | +#define TZ_MAX_TYPES 256 /* Limited by what (unsigned char)'s can hold */ |
| 106 | +#endif /* !defined TZ_MAX_TYPES */ |
| 107 | + |
| 108 | +#ifndef TZ_MAX_CHARS |
| 109 | +#define TZ_MAX_CHARS 50 /* Maximum number of abbreviation characters */ |
| 110 | + /* (limited by what unsigned chars can hold) */ |
| 111 | +#endif /* !defined TZ_MAX_CHARS */ |
| 112 | + |
| 113 | +#ifndef TZ_MAX_LEAPS |
| 114 | +#define TZ_MAX_LEAPS 50 /* Maximum number of leap second corrections */ |
| 115 | +#endif /* !defined TZ_MAX_LEAPS */ |
| 116 | + |
| 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 |
| 126 | + |
| 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 |
| 134 | + |
| 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 |
| 147 | + |
| 148 | +#define TM_YEAR_BASE 1900 |
| 149 | + |
| 150 | +#define EPOCH_YEAR 1970 |
| 151 | +#define EPOCH_WDAY TM_THURSDAY |
| 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 |
| 157 | +** isleap(y) == isleap(y % 400) |
| 158 | +** and so |
| 159 | +** isleap(a + b) == isleap((a + b) % 400) |
| 160 | +** or |
| 161 | +** isleap(a + b) == isleap(a % 400 + b % 400) |
| 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 | + |
| 167 | +#define isleap_sum(a, b) isleap((a) % 400 + (b) % 400) |
| 168 | + |
| 169 | +#endif /* !defined TZFILE_H */ |
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