| Current File : //usr/include/mysql/server/private/tzfile.h |
#ifndef TZFILE_INCLUDED
#define TZFILE_INCLUDED
/* Copyright (c) 2004, 2006, 2007 MySQL AB, 2009 Sun Microsystems, Inc.
Use is subject to license terms.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
/*
This file is based on public domain code from ftp://elsie.ncih.nist.gov/
Initial source code is in the public domain, so clarified as of
1996-06-05 by Arthur David Olson (arthur_david_olson@nih.gov).
*/
/*
Information about time zone files.
*/
#ifndef TZDIR
#define TZDIR "/usr/share/zoneinfo" /* Time zone object file directory */
#endif /* !defined TZDIR */
/*
Each file begins with. . .
*/
#define TZ_MAGIC "TZif"
struct tzhead {
uchar tzh_magic[4]; /* TZ_MAGIC */
uchar tzh_reserved[16]; /* reserved for future use */
uchar tzh_ttisgmtcnt[4]; /* coded number of trans. time flags */
uchar tzh_ttisstdcnt[4]; /* coded number of trans. time flags */
uchar tzh_leapcnt[4]; /* coded number of leap seconds */
uchar tzh_timecnt[4]; /* coded number of transition times */
uchar tzh_typecnt[4]; /* coded number of local time types */
uchar 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
*/
/*
In the current implementation, we refuse to deal with files that
exceed any of the limits below.
*/
#ifndef TZ_MAX_TIMES
/*
The TZ_MAX_TIMES value below is enough to handle a bit more than a
year's worth of solar time (corrected daily to the nearest second) or
138 years of Pacific Presidential Election time
(where there are three time zone transitions every fourth year).
*/
#define TZ_MAX_TIMES 370
#endif /* !defined TZ_MAX_TIMES */
#ifndef TZ_MAX_TYPES
#ifdef SOLAR
#define TZ_MAX_TYPES 256 /* Limited by what (unsigned char)'s can hold */
#else
/*
Must be at least 14 for Europe/Riga as of Jan 12 1995,
as noted by Earl Chew <earl@hpato.aus.hp.com>.
*/
#define TZ_MAX_TYPES 20 /* Maximum number of local time types */
#endif /* defined SOLAR */
#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 */
#ifndef TZ_MAX_REV_RANGES
#ifdef SOLAR
/* Solar (Asia/RiyadhXX) zones need significantly bigger TZ_MAX_REV_RANGES */
#define TZ_MAX_REV_RANGES (TZ_MAX_TIMES*2+TZ_MAX_LEAPS*2+2)
#else
#define TZ_MAX_REV_RANGES (TZ_MAX_TIMES+TZ_MAX_LEAPS+2)
#endif
#endif
#define SECS_PER_MIN 60
#define MINS_PER_HOUR 60
#define HOURS_PER_DAY 24
#define DAYS_PER_WEEK 7
#define DAYS_PER_NYEAR 365
#define DAYS_PER_LYEAR 366
#define SECS_PER_HOUR (SECS_PER_MIN * MINS_PER_HOUR)
#define SECS_PER_DAY ((long) SECS_PER_HOUR * HOURS_PER_DAY)
#define MONS_PER_YEAR 12
#define TM_YEAR_BASE 1900
#define EPOCH_YEAR 1970
/*
Accurate only for the past couple of centuries,
that will probably do.
*/
#define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
#endif