~drizzle-trunk/drizzle/development

/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-

 *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:

 *

 *  Copyright (C) 2008 Sun Microsystems

 *

 *  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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  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 DRIZZLED_TZFILE_H

#define DRIZZLED_TZFILE_H

#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 {

 	unsigned char	tzh_magic[4];		/* TZ_MAGIC */

	unsigned char	tzh_reserved[16];	/* reserved for future use */

	unsigned char	tzh_ttisgmtcnt[4];	/* coded number of trans. time flags */

	unsigned char	tzh_ttisstdcnt[4];	/* coded number of trans. time flags */

	unsigned char	tzh_leapcnt[4];		/* coded number of leap seconds */

	unsigned char	tzh_timecnt[4];		/* coded number of transition times */

	unsigned char	tzh_typecnt[4];		/* coded number of local time types */

	unsigned 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                   '\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 /* DRIZZLED_TZFILE_H */