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 #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!

 */

 /*

 ** ID

 */

 #ifndef lint

 #ifndef NOID

 static char	tzfilehid[] = "@(#)tzfile.h	8.1";

 #endif /* !defined NOID */

 #endif /* !defined lint */

 /*

 ** Information about time zone files.

 */

 #ifndef TZDIR

 #define TZDIR	"/usr/local/etc/zoneinfo" /* Time zone object file directory */

 #endif /* !defined TZDIR */

 #ifndef TZDEFAULT

 #define TZDEFAULT	"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' as of 2005 */

 	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 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

 */

 /*

 ** 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).

 */

 /*

 ** 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	1200

 #endif /* !defined TZ_MAX_TIMES */

 #ifndef TZ_MAX_TYPES

 #ifndef NOSOLAR

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

 #endif /* !defined NOSOLAR */

 #ifdef NOSOLAR

 /*

 ** Must be at least 14 for Europe/Riga as of Jan 12 1995,

 ** as noted by Earl Chew.

 */

 #define TZ_MAX_TYPES	20	/* Maximum number of local time types */

 #endif /* !defined NOSOLAR */

 #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	((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

 #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 */