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tzfile.h

/*
 *    Ported to Linux's Second Extended File System as part of the
 *    dump and restore backup suit
 *    Remy Card <Remy.Card@freenix.fr>, 1994, 1995
 *
 */

/*
 * Copyright (c) 1988, 1993
 *    The 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.
 *
 *    @(#)tzfile.h      8.1 (Berkeley) 6/2/93
 */

#ifndef _TZFILE_H_
#define     _TZFILE_H_

/*
 * Information about time zone files.
 */
                  /* Time zone object file directory */
#define TZDIR           "/usr/share/zoneinfo"
#define TZDEFAULT "/etc/localtime"
#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           '\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
*/

/*
** 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_ */

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