| #ifndef TZFILE_H |
| |
| #define TZFILE_H |
| |
| /* |
| ** This file is in the public domain, so clarified as of |
| ** 1996-06-05 by Arthur David Olson. |
| */ |
| |
| /* |
| ** This header is for use ONLY with the time conversion code. |
| ** There is no guarantee that it will remain unchanged, |
| ** or that it will remain at all. |
| ** Do NOT copy it to any system include directory. |
| ** Thank you! |
| */ |
| |
| /* |
| ** Information about time zone files. |
| */ |
| |
| #ifndef TZDIR |
| #define TZDIR "/usr/local/etc/zoneinfo" /* Time zone object file directory */ |
| #endif /* !defined TZDIR */ |
| |
| #ifndef TZDEFAULT |
| #define TZDEFAULT "localtime" |
| #endif /* !defined TZDEFAULT */ |
| |
| #ifndef TZDEFRULES |
| #define TZDEFRULES "posixrules" |
| #endif /* !defined TZDEFRULES */ |
| |
| /* |
| ** Each file begins with. . . |
| */ |
| |
| #define TZ_MAGIC "TZif" |
| |
| struct tzhead { |
| char tzh_magic[4]; /* TZ_MAGIC */ |
| char tzh_version[1]; /* '\0' or '2' or '3' as of 2013 */ |
| char tzh_reserved[15]; /* reserved--must be zero */ |
| char tzh_ttisgmtcnt[4]; /* coded number of trans. time flags */ |
| char tzh_ttisstdcnt[4]; /* coded number of trans. time flags */ |
| char tzh_leapcnt[4]; /* coded number of leap seconds */ |
| char tzh_timecnt[4]; /* coded number of transition times */ |
| char tzh_typecnt[4]; /* coded number of local time types */ |
| char tzh_charcnt[4]; /* coded number of abbr. chars */ |
| }; |
| |
| /* |
| ** . . .followed by. . . |
| ** |
| ** tzh_timecnt (char [4])s coded transition times a la time(2) |
| ** tzh_timecnt (unsigned char)s types of local time starting at above |
| ** tzh_typecnt repetitions of |
| ** one (char [4]) coded UT offset in seconds |
| ** one (unsigned char) used to set tm_isdst |
| ** one (unsigned char) that's an abbreviation list index |
| ** tzh_charcnt (char)s '\0'-terminated zone abbreviations |
| ** tzh_leapcnt repetitions of |
| ** one (char [4]) coded leap second transition times |
| ** one (char [4]) total correction after above |
| ** tzh_ttisstdcnt (char)s indexed by type; if TRUE, transition |
| ** time is standard time, if FALSE, |
| ** transition time is wall clock time |
| ** if absent, transition times are |
| ** assumed to be wall clock time |
| ** tzh_ttisgmtcnt (char)s indexed by type; if TRUE, transition |
| ** time is UT, if FALSE, |
| ** transition time is local time |
| ** if absent, transition times are |
| ** assumed to be local time |
| */ |
| |
| /* |
| ** If tzh_version is '2' or greater, the above is followed by a second instance |
| ** of tzhead and a second instance of the data in which each coded transition |
| ** time uses 8 rather than 4 chars, |
| ** then a POSIX-TZ-environment-variable-style string for use in handling |
| ** instants after the last transition time stored in the file |
| ** (with nothing between the newlines if there is no POSIX representation for |
| ** such instants). |
| ** |
| ** If tz_version is '3' or greater, the above is extended as follows. |
| ** First, the POSIX TZ string's hour offset may range from -167 |
| ** through 167 as compared to the POSIX-required 0 through 24. |
| ** Second, its DST start time may be January 1 at 00:00 and its stop |
| ** time December 31 at 24:00 plus the difference between DST and |
| ** standard time, indicating DST all year. |
| */ |
| |
| /* |
| ** In the current implementation, "tzset()" refuses to deal with files that |
| ** exceed any of the limits below. |
| */ |
| |
| #ifndef TZ_MAX_TIMES |
| #define TZ_MAX_TIMES 2000 |
| #endif /* !defined TZ_MAX_TIMES */ |
| |
| #ifndef TZ_MAX_TYPES |
| /* This must be at least 17 for Europe/Samara and Europe/Vilnius. */ |
| #define TZ_MAX_TYPES 256 /* Limited by what (unsigned char)'s can hold */ |
| #endif /* !defined TZ_MAX_TYPES */ |
| |
| #ifndef TZ_MAX_CHARS |
| #define TZ_MAX_CHARS 50 /* Maximum number of abbreviation characters */ |
| /* (limited by what unsigned chars can hold) */ |
| #endif /* !defined TZ_MAX_CHARS */ |
| |
| #ifndef TZ_MAX_LEAPS |
| #define TZ_MAX_LEAPS 50 /* Maximum number of leap second corrections */ |
| #endif /* !defined TZ_MAX_LEAPS */ |
| |
| #define SECSPERMIN 60 |
| #define MINSPERHOUR 60 |
| #define HOURSPERDAY 24 |
| #define DAYSPERWEEK 7 |
| #define DAYSPERNYEAR 365 |
| #define DAYSPERLYEAR 366 |
| #define SECSPERHOUR (SECSPERMIN * MINSPERHOUR) |
| #define SECSPERDAY ((int_fast32_t) SECSPERHOUR * HOURSPERDAY) |
| #define MONSPERYEAR 12 |
| |
| #define TM_SUNDAY 0 |
| #define TM_MONDAY 1 |
| #define TM_TUESDAY 2 |
| #define TM_WEDNESDAY 3 |
| #define TM_THURSDAY 4 |
| #define TM_FRIDAY 5 |
| #define TM_SATURDAY 6 |
| |
| #define TM_JANUARY 0 |
| #define TM_FEBRUARY 1 |
| #define TM_MARCH 2 |
| #define TM_APRIL 3 |
| #define TM_MAY 4 |
| #define TM_JUNE 5 |
| #define TM_JULY 6 |
| #define TM_AUGUST 7 |
| #define TM_SEPTEMBER 8 |
| #define TM_OCTOBER 9 |
| #define TM_NOVEMBER 10 |
| #define TM_DECEMBER 11 |
| |
| #define TM_YEAR_BASE 1900 |
| |
| #define EPOCH_YEAR 1970 |
| #define EPOCH_WDAY TM_THURSDAY |
| |
| #define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0)) |
| |
| /* |
| ** Since everything in isleap is modulo 400 (or a factor of 400), we know that |
| ** isleap(y) == isleap(y % 400) |
| ** and so |
| ** isleap(a + b) == isleap((a + b) % 400) |
| ** or |
| ** isleap(a + b) == isleap(a % 400 + b % 400) |
| ** This is true even if % means modulo rather than Fortran remainder |
| ** (which is allowed by C89 but not C99). |
| ** We use this to avoid addition overflow problems. |
| */ |
| |
| #define isleap_sum(a, b) isleap((a) % 400 + (b) % 400) |
| |
| #endif /* !defined TZFILE_H */ |
