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142 lines
4.9 KiB
C
142 lines
4.9 KiB
C
#ifndef TZFILE_INCLUDED
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#define TZFILE_INCLUDED
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/* Copyright (c) 2004, 2006, 2007 MySQL AB, 2009 Sun Microsystems, Inc.
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Use is subject to license terms.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
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/*
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This file is based on public domain code from ftp://elsie.ncih.nist.gov/
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Initial source code is in the public domain, so clarified as of
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1996-06-05 by Arthur David Olson (arthur_david_olson@nih.gov).
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*/
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/*
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Information about time zone files.
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*/
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#ifndef TZDIR
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#define TZDIR "/usr/share/zoneinfo" /* Time zone object file directory */
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#endif /* !defined TZDIR */
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/*
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Each file begins with. . .
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*/
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#define TZ_MAGIC "TZif"
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struct tzhead {
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uchar tzh_magic[4]; /* TZ_MAGIC */
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uchar tzh_reserved[16]; /* reserved for future use */
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uchar tzh_ttisgmtcnt[4]; /* coded number of trans. time flags */
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uchar tzh_ttisstdcnt[4]; /* coded number of trans. time flags */
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uchar tzh_leapcnt[4]; /* coded number of leap seconds */
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uchar tzh_timecnt[4]; /* coded number of transition times */
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uchar tzh_typecnt[4]; /* coded number of local time types */
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uchar tzh_charcnt[4]; /* coded number of abbr. chars */
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};
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/*
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. . .followed by. . .
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tzh_timecnt (char [4])s coded transition times a la time(2)
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tzh_timecnt (unsigned char)s types of local time starting at above
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tzh_typecnt repetitions of
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one (char [4]) coded UTC offset in seconds
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one (unsigned char) used to set tm_isdst
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one (unsigned char) that's an abbreviation list index
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tzh_charcnt (char)s '\0'-terminated zone abbreviations
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tzh_leapcnt repetitions of
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one (char [4]) coded leap second transition times
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one (char [4]) total correction after above
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tzh_ttisstdcnt (char)s indexed by type; if TRUE, transition
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time is standard time, if FALSE,
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transition time is wall clock time
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if absent, transition times are
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assumed to be wall clock time
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tzh_ttisgmtcnt (char)s indexed by type; if TRUE, transition
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time is UTC, if FALSE,
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transition time is local time
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if absent, transition times are
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assumed to be local time
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*/
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/*
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In the current implementation, we refuse to deal with files that
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exceed any of the limits below.
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*/
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#ifndef TZ_MAX_TIMES
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/*
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The TZ_MAX_TIMES value below is enough to handle a bit more than a
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year's worth of solar time (corrected daily to the nearest second) or
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138 years of Pacific Presidential Election time
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(where there are three time zone transitions every fourth year).
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*/
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#define TZ_MAX_TIMES 370
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#endif /* !defined TZ_MAX_TIMES */
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#ifndef TZ_MAX_TYPES
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#ifdef SOLAR
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#define TZ_MAX_TYPES 256 /* Limited by what (unsigned char)'s can hold */
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#else
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/*
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Must be at least 14 for Europe/Riga as of Jan 12 1995,
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as noted by Earl Chew <earl@hpato.aus.hp.com>.
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*/
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#define TZ_MAX_TYPES 20 /* Maximum number of local time types */
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#endif /* defined SOLAR */
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#endif /* !defined TZ_MAX_TYPES */
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#ifndef TZ_MAX_CHARS
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#define TZ_MAX_CHARS 50 /* Maximum number of abbreviation characters */
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/* (limited by what unsigned chars can hold) */
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#endif /* !defined TZ_MAX_CHARS */
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#ifndef TZ_MAX_LEAPS
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#define TZ_MAX_LEAPS 50 /* Maximum number of leap second corrections */
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#endif /* !defined TZ_MAX_LEAPS */
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#ifndef TZ_MAX_REV_RANGES
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#ifdef SOLAR
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/* Solar (Asia/RiyadhXX) zones need significantly bigger TZ_MAX_REV_RANGES */
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#define TZ_MAX_REV_RANGES (TZ_MAX_TIMES*2+TZ_MAX_LEAPS*2+2)
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#else
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#define TZ_MAX_REV_RANGES (TZ_MAX_TIMES+TZ_MAX_LEAPS+2)
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#endif
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#endif
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#define SECS_PER_MIN 60
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#define MINS_PER_HOUR 60
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#define HOURS_PER_DAY 24
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#define DAYS_PER_WEEK 7
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#define DAYS_PER_NYEAR 365
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#define DAYS_PER_LYEAR 366
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#define SECS_PER_HOUR (SECS_PER_MIN * MINS_PER_HOUR)
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#define SECS_PER_DAY ((long) SECS_PER_HOUR * HOURS_PER_DAY)
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#define MONS_PER_YEAR 12
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#define TM_YEAR_BASE 1900
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#define EPOCH_YEAR 1970
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/*
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Accurate only for the past couple of centuries,
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that will probably do.
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*/
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#define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
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#endif
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