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Commit	Line	Data
	1	#ifndef TZFILE_H
	2
	3	#define TZFILE_H
	4
	5	/*
	6	** This file is in the public domain, so clarified as of
	7	** 1996-06-05 by Arthur David Olson.
	8	*/
	9
	10	/*
	11	** This header is for use ONLY with the time conversion code.
	12	** There is no guarantee that it will remain unchanged,
	13	** or that it will remain at all.
	14	** Do NOT copy it to any system include directory.
	15	** Thank you!
	16	*/
	17
	18	/*
	19	** ID
	20	*/
	21
	22	#ifndef lint
	23	#ifndef NOID
	24	static char tzfilehid[] = "@(#)tzfile.h 8.1";
	25	#endif /* !defined NOID */
	26	#endif /* !defined lint */
	27
	28	/*
	29	** Information about time zone files.
	30	*/
	31
	32	#ifndef TZDIR
	33	#define TZDIR "/usr/local/etc/zoneinfo" /* Time zone object file directory */
	34	#endif /* !defined TZDIR */
	35
	36	#ifndef TZDEFAULT
	37	#define TZDEFAULT "localtime"
	38	#endif /* !defined TZDEFAULT */
	39
	40	#ifndef TZDEFRULES
	41	#define TZDEFRULES "posixrules"
	42	#endif /* !defined TZDEFRULES */
	43
	44	/*
	45	** Each file begins with. . .
	46	*/
	47
	48	#define TZ_MAGIC "TZif"
	49
	50	struct tzhead {
	51	char tzh_magic[4]; /* TZ_MAGIC */
	52	char tzh_version[1]; /* '\0' or '2' as of 2005 */
	53	char tzh_reserved[15]; /* reserved--must be zero */
	54	char tzh_ttisgmtcnt[4]; /* coded number of trans. time flags */
	55	char tzh_ttisstdcnt[4]; /* coded number of trans. time flags */
	56	char tzh_leapcnt[4]; /* coded number of leap seconds */
	57	char tzh_timecnt[4]; /* coded number of transition times */
	58	char tzh_typecnt[4]; /* coded number of local time types */
	59	char tzh_charcnt[4]; /* coded number of abbr. chars */
	60	};
	61
	62	/*
	63	** . . .followed by. . .
	64	**
	65	** tzh_timecnt (char [4])s coded transition times a la time(2)
	66	** tzh_timecnt (unsigned char)s types of local time starting at above
	67	** tzh_typecnt repetitions of
	68	** one (char [4]) coded UTC offset in seconds
	69	** one (unsigned char) used to set tm_isdst
	70	** one (unsigned char) that's an abbreviation list index
	71	** tzh_charcnt (char)s '\0'-terminated zone abbreviations
	72	** tzh_leapcnt repetitions of
	73	** one (char [4]) coded leap second transition times
	74	** one (char [4]) total correction after above
	75	** tzh_ttisstdcnt (char)s indexed by type; if TRUE, transition
	76	** time is standard time, if FALSE,
	77	** transition time is wall clock time
	78	** if absent, transition times are
	79	** assumed to be wall clock time
	80	** tzh_ttisgmtcnt (char)s indexed by type; if TRUE, transition
	81	** time is UTC, if FALSE,
	82	** transition time is local time
	83	** if absent, transition times are
	84	** assumed to be local time
	85	*/
	86
	87	/*
	88	** If tzh_version is '2' or greater, the above is followed by a second instance
	89	** of tzhead and a second instance of the data in which each coded transition
	90	** time uses 8 rather than 4 chars,
	91	** then a POSIX-TZ-environment-variable-style string for use in handling
	92	** instants after the last transition time stored in the file
	93	** (with nothing between the newlines if there is no POSIX representation for
	94	** such instants).
	95	*/
	96
	97	/*
	98	** In the current implementation, "tzset()" refuses to deal with files that
	99	** exceed any of the limits below.
	100	*/
	101
	102	#ifndef TZ_MAX_TIMES
	103	#define TZ_MAX_TIMES 1200
	104	#endif /* !defined TZ_MAX_TIMES */
	105
	106	#ifndef TZ_MAX_TYPES
	107	#ifndef NOSOLAR
	108	#define TZ_MAX_TYPES 256 /* Limited by what (unsigned char)'s can hold */
	109	#endif /* !defined NOSOLAR */
	110	#ifdef NOSOLAR
	111	/*
	112	** Must be at least 14 for Europe/Riga as of Jan 12 1995,
	113	** as noted by Earl Chew.
	114	*/
	115	#define TZ_MAX_TYPES 20 /* Maximum number of local time types */
	116	#endif /* !defined NOSOLAR */
	117	#endif /* !defined TZ_MAX_TYPES */
	118
	119	#ifndef TZ_MAX_CHARS
	120	#define TZ_MAX_CHARS 50 /* Maximum number of abbreviation characters */
	121	/* (limited by what unsigned chars can hold) */
	122	#endif /* !defined TZ_MAX_CHARS */
	123
	124	#ifndef TZ_MAX_LEAPS
	125	#define TZ_MAX_LEAPS 50 /* Maximum number of leap second corrections */
	126	#endif /* !defined TZ_MAX_LEAPS */
	127
	128	#define SECSPERMIN 60
	129	#define MINSPERHOUR 60
	130	#define HOURSPERDAY 24
	131	#define DAYSPERWEEK 7
	132	#define DAYSPERNYEAR 365
	133	#define DAYSPERLYEAR 366
	134	#define SECSPERHOUR (SECSPERMIN * MINSPERHOUR)
	135	#define SECSPERDAY ((long) SECSPERHOUR * HOURSPERDAY)
	136	#define MONSPERYEAR 12
	137
	138	#define TM_SUNDAY 0
	139	#define TM_MONDAY 1
	140	#define TM_TUESDAY 2
	141	#define TM_WEDNESDAY 3
	142	#define TM_THURSDAY 4
	143	#define TM_FRIDAY 5
	144	#define TM_SATURDAY 6
	145
	146	#define TM_JANUARY 0
	147	#define TM_FEBRUARY 1
	148	#define TM_MARCH 2
	149	#define TM_APRIL 3
	150	#define TM_MAY 4
	151	#define TM_JUNE 5
	152	#define TM_JULY 6
	153	#define TM_AUGUST 7
	154	#define TM_SEPTEMBER 8
	155	#define TM_OCTOBER 9
	156	#define TM_NOVEMBER 10
	157	#define TM_DECEMBER 11
	158
	159	#define TM_YEAR_BASE 1900
	160
	161	#define EPOCH_YEAR 1970
	162	#define EPOCH_WDAY TM_THURSDAY
	163
	164	#define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 \|\| ((y) % 400) == 0))
	165
	166	/*
	167	** Since everything in isleap is modulo 400 (or a factor of 400), we know that
	168	** isleap(y) == isleap(y % 400)
	169	** and so
	170	** isleap(a + b) == isleap((a + b) % 400)
	171	** or
	172	** isleap(a + b) == isleap(a % 400 + b % 400)
	173	** This is true even if % means modulo rather than Fortran remainder
	174	** (which is allowed by C89 but not C99).
	175	** We use this to avoid addition overflow problems.
	176	*/
	177
	178	#define isleap_sum(a, b) isleap((a) % 400 + (b) % 400)
	179
	180	#endif /* !defined TZFILE_H */