171 lines
5.0 KiB
C
171 lines
5.0 KiB
C
/* $NetBSD: tzfile.h,v 1.8 2015/07/11 16:40:53 christos Exp $ */
|
|
|
|
#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 /* Time zone object file directory */
|
|
#define TZDIR "/usr/share/zoneinfo"
|
|
#endif /* !defined TZDIR */
|
|
|
|
#ifndef TZDEFAULT
|
|
#define TZDEFAULT "/etc/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 1, transition
|
|
** time is standard time, if 0,
|
|
** 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 1, transition
|
|
** time is UT, if 0,
|
|
** 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_ */
|