michael@0: #ifndef TZFILE_H
michael@0: 
michael@0: #define TZFILE_H
michael@0: 
michael@0: /*
michael@0: ** This file is in the public domain, so clarified as of
michael@0: ** 1996-06-05 by Arthur David Olson.
michael@0: */
michael@0: 
michael@0: /*
michael@0: ** This header is for use ONLY with the time conversion code.
michael@0: ** There is no guarantee that it will remain unchanged,
michael@0: ** or that it will remain at all.
michael@0: ** Do NOT copy it to any system include directory.
michael@0: ** Thank you!
michael@0: */
michael@0: 
michael@0: /*
michael@0: ** ID
michael@0: */
michael@0: 
michael@0: #ifndef lint
michael@0: #ifndef NOID
michael@0: static char	tzfilehid[] = "@(#)tzfile.h	8.1";
michael@0: #endif /* !defined NOID */
michael@0: #endif /* !defined lint */
michael@0: 
michael@0: /*
michael@0: ** Information about time zone files.
michael@0: */
michael@0: 
michael@0: #ifndef TZDIR
michael@0: #define TZDIR	"/usr/local/etc/zoneinfo" /* Time zone object file directory */
michael@0: #endif /* !defined TZDIR */
michael@0: 
michael@0: #ifndef TZDEFAULT
michael@0: #define TZDEFAULT	"localtime"
michael@0: #endif /* !defined TZDEFAULT */
michael@0: 
michael@0: #ifndef TZDEFRULES
michael@0: #define TZDEFRULES	"posixrules"
michael@0: #endif /* !defined TZDEFRULES */
michael@0: 
michael@0: /*
michael@0: ** Each file begins with. . .
michael@0: */
michael@0: 
michael@0: #define	TZ_MAGIC	"TZif"
michael@0: 
michael@0: struct tzhead {
michael@0: 	char	tzh_magic[4];		/* TZ_MAGIC */
michael@0: 	char	tzh_version[1];		/* '\0' or '2' as of 2005 */
michael@0: 	char	tzh_reserved[15];	/* reserved--must be zero */
michael@0: 	char	tzh_ttisgmtcnt[4];	/* coded number of trans. time flags */
michael@0: 	char	tzh_ttisstdcnt[4];	/* coded number of trans. time flags */
michael@0: 	char	tzh_leapcnt[4];		/* coded number of leap seconds */
michael@0: 	char	tzh_timecnt[4];		/* coded number of transition times */
michael@0: 	char	tzh_typecnt[4];		/* coded number of local time types */
michael@0: 	char	tzh_charcnt[4];		/* coded number of abbr. chars */
michael@0: };
michael@0: 
michael@0: /*
michael@0: ** . . .followed by. . .
michael@0: **
michael@0: **	tzh_timecnt (char [4])s		coded transition times a la time(2)
michael@0: **	tzh_timecnt (unsigned char)s	types of local time starting at above
michael@0: **	tzh_typecnt repetitions of
michael@0: **		one (char [4])		coded UTC offset in seconds
michael@0: **		one (unsigned char)	used to set tm_isdst
michael@0: **		one (unsigned char)	that's an abbreviation list index
michael@0: **	tzh_charcnt (char)s		'\0'-terminated zone abbreviations
michael@0: **	tzh_leapcnt repetitions of
michael@0: **		one (char [4])		coded leap second transition times
michael@0: **		one (char [4])		total correction after above
michael@0: **	tzh_ttisstdcnt (char)s		indexed by type; if TRUE, transition
michael@0: **					time is standard time, if FALSE,
michael@0: **					transition time is wall clock time
michael@0: **					if absent, transition times are
michael@0: **					assumed to be wall clock time
michael@0: **	tzh_ttisgmtcnt (char)s		indexed by type; if TRUE, transition
michael@0: **					time is UTC, if FALSE,
michael@0: **					transition time is local time
michael@0: **					if absent, transition times are
michael@0: **					assumed to be local time
michael@0: */
michael@0: 
michael@0: /*
michael@0: ** If tzh_version is '2' or greater, the above is followed by a second instance
michael@0: ** of tzhead and a second instance of the data in which each coded transition
michael@0: ** time uses 8 rather than 4 chars,
michael@0: ** then a POSIX-TZ-environment-variable-style string for use in handling
michael@0: ** instants after the last transition time stored in the file
michael@0: ** (with nothing between the newlines if there is no POSIX representation for
michael@0: ** such instants).
michael@0: */
michael@0: 
michael@0: /*
michael@0: ** In the current implementation, "tzset()" refuses to deal with files that
michael@0: ** exceed any of the limits below.
michael@0: */
michael@0: 
michael@0: #ifndef TZ_MAX_TIMES
michael@0: #define TZ_MAX_TIMES	1200
michael@0: #endif /* !defined TZ_MAX_TIMES */
michael@0: 
michael@0: #ifndef TZ_MAX_TYPES
michael@0: #ifndef NOSOLAR
michael@0: #define TZ_MAX_TYPES	256 /* Limited by what (unsigned char)'s can hold */
michael@0: #endif /* !defined NOSOLAR */
michael@0: #ifdef NOSOLAR
michael@0: /*
michael@0: ** Must be at least 14 for Europe/Riga as of Jan 12 1995,
michael@0: ** as noted by Earl Chew.
michael@0: */
michael@0: #define TZ_MAX_TYPES	20	/* Maximum number of local time types */
michael@0: #endif /* !defined NOSOLAR */
michael@0: #endif /* !defined TZ_MAX_TYPES */
michael@0: 
michael@0: #ifndef TZ_MAX_CHARS
michael@0: #define TZ_MAX_CHARS	50	/* Maximum number of abbreviation characters */
michael@0: 				/* (limited by what unsigned chars can hold) */
michael@0: #endif /* !defined TZ_MAX_CHARS */
michael@0: 
michael@0: #ifndef TZ_MAX_LEAPS
michael@0: #define TZ_MAX_LEAPS	50	/* Maximum number of leap second corrections */
michael@0: #endif /* !defined TZ_MAX_LEAPS */
michael@0: 
michael@0: #define SECSPERMIN	60
michael@0: #define MINSPERHOUR	60
michael@0: #define HOURSPERDAY	24
michael@0: #define DAYSPERWEEK	7
michael@0: #define DAYSPERNYEAR	365
michael@0: #define DAYSPERLYEAR	366
michael@0: #define SECSPERHOUR	(SECSPERMIN * MINSPERHOUR)
michael@0: #define SECSPERDAY	((long) SECSPERHOUR * HOURSPERDAY)
michael@0: #define MONSPERYEAR	12
michael@0: 
michael@0: #define TM_SUNDAY	0
michael@0: #define TM_MONDAY	1
michael@0: #define TM_TUESDAY	2
michael@0: #define TM_WEDNESDAY	3
michael@0: #define TM_THURSDAY	4
michael@0: #define TM_FRIDAY	5
michael@0: #define TM_SATURDAY	6
michael@0: 
michael@0: #define TM_JANUARY	0
michael@0: #define TM_FEBRUARY	1
michael@0: #define TM_MARCH	2
michael@0: #define TM_APRIL	3
michael@0: #define TM_MAY		4
michael@0: #define TM_JUNE		5
michael@0: #define TM_JULY		6
michael@0: #define TM_AUGUST	7
michael@0: #define TM_SEPTEMBER	8
michael@0: #define TM_OCTOBER	9
michael@0: #define TM_NOVEMBER	10
michael@0: #define TM_DECEMBER	11
michael@0: 
michael@0: #define TM_YEAR_BASE	1900
michael@0: 
michael@0: #define EPOCH_YEAR	1970
michael@0: #define EPOCH_WDAY	TM_THURSDAY
michael@0: 
michael@0: #define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
michael@0: 
michael@0: /*
michael@0: ** Since everything in isleap is modulo 400 (or a factor of 400), we know that
michael@0: **	isleap(y) == isleap(y % 400)
michael@0: ** and so
michael@0: **	isleap(a + b) == isleap((a + b) % 400)
michael@0: ** or
michael@0: **	isleap(a + b) == isleap(a % 400 + b % 400)
michael@0: ** This is true even if % means modulo rather than Fortran remainder
michael@0: ** (which is allowed by C89 but not C99).
michael@0: ** We use this to avoid addition overflow problems.
michael@0: */
michael@0: 
michael@0: #define isleap_sum(a, b)	isleap((a) % 400 + (b) % 400)
michael@0: 
michael@0: #endif /* !defined TZFILE_H */