/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*
 *      from Arthur Olson's 6.1
 */

#ifndef _SYS_TZFILE_H
#define _SYS_TZFILE_H

#ifdef  __cplusplus
extern "C" {
#endif

/*
 * Information about time zone files.
 */

#define TZDIR   "/usr/share/lib/zoneinfo" /* Time zone object file directory */

#define TZDEFAULT       (getenv("TZ"))

#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 TZ_MAX_TYPES    256     /* Limited by what (unsigned char)'s can hold */

#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)

/*
 * Use of the underscored variants may cause problems if you move your code to
 * certain System-V-based systems; for maximum portability, use the
 * underscore-free variants.  The underscored variants are provided for
 * backward compatibility only; they may disappear from future versions of
 * this file.
 */

#define SECS_PER_MIN    SECSPERMIN
#define MINS_PER_HOUR   MINSPERHOUR
#define HOURS_PER_DAY   HOURSPERDAY
#define DAYS_PER_WEEK   DAYSPERWEEK
#define DAYS_PER_NYEAR  DAYSPERNYEAR
#define DAYS_PER_LYEAR  DAYSPERLYEAR
#define SECS_PER_HOUR   SECSPERHOUR
#define SECS_PER_DAY    SECSPERDAY
#define MONS_PER_YEAR   MONSPERYEAR

#ifdef  __cplusplus
}
#endif

#endif /* _SYS_TZFILE_H */