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#ifndef TZFILE_H
#define TZFILE_H
/*
* This file is in the public domain, so clarified as of
* 1996-06-05 by Arthur David Olson.
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/timezone/tzfile.h,v 1.7 2008/02/16 21:16:04 tgl Exp $
*/
/*
* 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.
*/
#define TZDEFAULT "localtime"
#define TZDEFRULES "posixrules"
/*
* Each file begins with. . .
*/
#define TZ_MAGIC "TZif"
struct tzhead
{
char tzh_magic[4]; /* TZ_MAGIC */
char tzh_version[1]; /* '\0' or '2' as of 2005 */
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 UTC 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 UTC, 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).
*/
/*
* In the current implementation, "tzset()" refuses to deal with files that
* exceed any of the limits below.
*/
#define TZ_MAX_TIMES 1200
#define TZ_MAX_TYPES 256 /* Limited by what (unsigned char)'s can hold */
#define TZ_MAX_CHARS 50 /* Maximum number of abbreviation characters */
/* (limited by what unsigned chars can hold) */
#define TZ_MAX_LEAPS 50 /* Maximum number of leap second corrections */
#define SECSPERMIN 60
#define MINSPERHOUR 60
#define HOURSPERDAY 24
#define DAYSPERWEEK 7
#define DAYSPERNYEAR 365
#define DAYSPERLYEAR 366
#define SECSPERHOUR (SECSPERMIN * MINSPERHOUR)
#define SECSPERDAY ((long) 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 */
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