tzfile.h
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上传日期:2007-04-14
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- /*
- * Copyright (c) 1988 Regents of the University of California.
- * All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Arthur David Olson of the National Cancer Institute.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * from: @(#)tzfile.h 5.10 (Berkeley) 4/3/91
- * $Id$
- */
- #ifndef _TZFILE_H_
- #define _TZFILE_H_
- #include <pthread/paths.h>
- /*
- * Information about time zone files.
- */
- #define TZDIR _PATH_TZDIR
- #define TZDEFAULT _PATH_TZFILE
- #define TZDEFRULES "posixrules"
- /*
- ** Each file begins with. . .
- */
- struct tzhead {
- char tzh_reserved[24]; /* reserved for future use */
- 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 GMT 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
- */
- /*
- ** In the current implementation, "tzset()" refuses to deal with files that
- ** exceed any of the limits below.
- */
- /*
- ** 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
- #define NOSOLAR /* 4BSD doesn't currently handle solar time */
- #ifndef NOSOLAR
- #define TZ_MAX_TYPES 256 /* Limited by what (unsigned char)'s can hold */
- #else
- #define TZ_MAX_TYPES 10 /* Maximum number of local time types */
- #endif
- #define TZ_MAX_CHARS 50 /* Maximum number of abbreviation characters */
- #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
- /*
- ** 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 /* !_TZFILE_H_ */