tzfile.h
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- /* Copyright (C) 2004 MySQL AB
- 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; either version 2 of the License, or
- (at your option) any later version.
- 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 {
- char tzh_magic[4]; /* TZ_MAGIC */
- char tzh_reserved[16]; /* reserved for future use */
- 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 ' '-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))