LCOM1920-T02G10

/*        $NetBSD: tzfile.h,v 1.8 2015/07/11 16:40:53 christos Exp $        */

#ifndef _TZFILE_H_

#define _TZFILE_H_

/*

** This file is in the public domain, so clarified as of

** 1996-06-05 by Arthur David Olson.

*/

/*

** This header is for use ONLY with the time conversion code.

** There is no guarantee that it will remain unchanged,

** or that it will remain at all.

** Do NOT copy it to any system include directory.

** Thank you!

*/

/*

** Information about time zone files.

*/

#ifndef TZDIR                /* Time zone object file directory */

#define TZDIR                "/usr/share/zoneinfo"

#endif /* !defined TZDIR */

#ifndef TZDEFAULT

#define TZDEFAULT        "/etc/localtime"

#endif /* !defined TZDEFAULT */

#ifndef TZDEFRULES

#define TZDEFRULES        "posixrules"

#endif /* !defined TZDEFRULES */

/*

** Each file begins with. . .

*/

#define        TZ_MAGIC        "TZif"

struct tzhead {

        char        tzh_magic[4];                /* TZ_MAGIC */

        char        tzh_version[1];                /* '\0' or '2' or '3' as of 2013 */

        char        tzh_reserved[15];        /* reserved; must be zero */

        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 UT 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 1, transition

**                                        time is standard time, if 0,

**                                        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 1, transition

**                                        time is UT, if 0,

**                                        transition time is local time

**                                        if absent, transition times are

**                                        assumed to be local time

*/

/*

** If tzh_version is '2' or greater, the above is followed by a second instance

** of tzhead and a second instance of the data in which each coded transition

** time uses 8 rather than 4 chars,

** then a POSIX-TZ-environment-variable-style string for use in handling

** instants after the last transition time stored in the file

** (with nothing between the newlines if there is no POSIX representation for

** such instants).

**

** If tz_version is '3' or greater, the above is extended as follows.

** First, the POSIX TZ string's hour offset may range from -167

** through 167 as compared to the POSIX-required 0 through 24.

** Second, its DST start time may be January 1 at 00:00 and its stop

** time December 31 at 24:00 plus the difference between DST and

** standard time, indicating DST all year.

*/

/*

** In the current implementation, "tzset()" refuses to deal with files that

** exceed any of the limits below.

*/

#ifndef TZ_MAX_TIMES

#define TZ_MAX_TIMES        2000

#endif /* !defined TZ_MAX_TIMES */

#ifndef TZ_MAX_TYPES

/* This must be at least 17 for Europe/Samara and Europe/Vilnius.  */

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

#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 */

#define SECSPERMIN        60

#define MINSPERHOUR        60

#define HOURSPERDAY        24

#define DAYSPERWEEK        7

#define DAYSPERNYEAR        365

#define DAYSPERLYEAR        366

#define SECSPERHOUR        (SECSPERMIN * MINSPERHOUR)

#define SECSPERDAY        ((int_fast32_t) 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

#define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))

/*

** Since everything in isleap is modulo 400 (or a factor of 400), we know that

**        isleap(y) == isleap(y % 400)

** and so

**        isleap(a + b) == isleap((a + b) % 400)

** or

**        isleap(a + b) == isleap(a % 400 + b % 400)

** This is true even if % means modulo rather than Fortran remainder

** (which is allowed by C89 but not C99).

** We use this to avoid addition overflow problems.

*/

#define isleap_sum(a, b)        isleap((a) % 400 + (b) % 400)

#endif /* !defined _TZFILE_H_ */