[unix-history] / usr / src / include / tzfile.h

/*
 *	@(#)tzfile.h	5.2 tzfile.h %G%
 */

/*
** Information about time zone files.
*/

#define	TZDIR		"/etc/zoneinfo"	/* Time zone object file directory */
#define	TZDEFAULT	"localtime"

/*
** Each file begins with. . .
*/

struct tzhead {
	char	tzh_reserved[32];	/* reserved for future use */
	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_isdt
**		one (unsigned char)	that's an abbreviation list index
**	tzh_charcnt (char)s		'\0'-terminated zone abbreviaton strings
*/

/*
** 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	NOSOLAR			/* We currently don't handle solar time */

#ifndef	NOSOLAR
#define	TZ_MAX_TYPES	256	/* Limited by what (unsigned char)'s can hold */
#else /* !NOSOLAR */
#define	TZ_MAX_TYPES	10	/* Maximum number of local time types */
#endif /* !NOSOLAR */

#define	TZ_MAX_CHARS	50	/* Maximum number of abbreviation characters */

#define	SECS_PER_MIN	60
#define	MINS_PER_HOUR	60
#define	HOURS_PER_DAY	24
#define	DAYS_PER_WEEK	7
#define	DAYS_PER_NYEAR	365
#define	DAYS_PER_LYEAR	366
#define	SECS_PER_HOUR	(SECS_PER_MIN * MINS_PER_HOUR)
#define	SECS_PER_DAY	((long) SECS_PER_HOUR * HOURS_PER_DAY)
#define	MONS_PER_YEAR	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_SUNDAY	0

#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)
Commit	Line	Data
6949fc73	1	/*
23008b13	2	* @(#)tzfile.h 5.2 tzfile.h %G%
6949fc73 KB	3	*/
	4
	5	/*
	6	** Information about time zone files.
	7	*/
	8
	9	#define TZDIR "/etc/zoneinfo" /* Time zone object file directory */
	10	#define TZDEFAULT "localtime"
	11
	12	/*
	13	** Each file begins with. . .
	14	*/
	15
	16	struct tzhead {
	17	char tzh_reserved[32]; /* reserved for future use */
	18	char tzh_timecnt[4]; /* coded number of transition times */
	19	char tzh_typecnt[4]; /* coded number of local time types */
	20	char tzh_charcnt[4]; /* coded number of abbr. chars */
	21	};
	22
	23	/*
	24	** . . .followed by. . .
	25	**
	26	** tzh_timecnt (char [4])s coded transition times a la time(2)
	27	** tzh_timecnt (unsigned char)s types of local time starting at above
	28	** tzh_typecnt repetitions of
	29	** one (char [4]) coded GMT offset in seconds
	30	** one (unsigned char) used to set tm_isdt
	31	** one (unsigned char) that's an abbreviation list index
	32	** tzh_charcnt (char)s '\0'-terminated zone abbreviaton strings
	33	*/
	34
	35	/*
	36	** In the current implementation, "tzset()" refuses to deal with files that
	37	** exceed any of the limits below.
	38	*/
	39
	40	/*
	41	** The TZ_MAX_TIMES value below is enough to handle a bit more than a
	42	** year's worth of solar time (corrected daily to the nearest second) or
	43	** 138 years of Pacific Presidential Election time
	44	** (where there are three time zone transitions every fourth year).
	45	*/
	46	#define TZ_MAX_TIMES 370
	47
	48	#define NOSOLAR /* We currently don't handle solar time */
	49
	50	#ifndef NOSOLAR
	51	#define TZ_MAX_TYPES 256 /* Limited by what (unsigned char)'s can hold */
	52	#else /* !NOSOLAR */
	53	#define TZ_MAX_TYPES 10 /* Maximum number of local time types */
	54	#endif /* !NOSOLAR */
	55
	56	#define TZ_MAX_CHARS 50 /* Maximum number of abbreviation characters */
	57
	58	#define SECS_PER_MIN 60
	59	#define MINS_PER_HOUR 60
	60	#define HOURS_PER_DAY 24
	61	#define DAYS_PER_WEEK 7
	62	#define DAYS_PER_NYEAR 365
	63	#define DAYS_PER_LYEAR 366
	64	#define SECS_PER_HOUR (SECS_PER_MIN * MINS_PER_HOUR)
	65	#define SECS_PER_DAY ((long) SECS_PER_HOUR * HOURS_PER_DAY)
	66	#define MONS_PER_YEAR 12
67
68	#define TM_SUNDAY 0
69	#define TM_MONDAY 1
70	#define TM_TUESDAY 2
71	#define TM_WEDNESDAY 3
72	#define TM_THURSDAY 4
73	#define TM_FRIDAY 5
74	#define TM_SATURDAY 6
75
76	#define TM_JANUARY 0
77	#define TM_FEBRUARY 1
78	#define TM_MARCH 2
79	#define TM_APRIL 3
80	#define TM_MAY 4
81	#define TM_JUNE 5
82	#define TM_JULY 6
83	#define TM_AUGUST 7
84	#define TM_SEPTEMBER 8
85	#define TM_OCTOBER 9
86	#define TM_NOVEMBER 10
87	#define TM_DECEMBER 11
88	#define TM_SUNDAY 0
89
90	#define TM_YEAR_BASE 1900
91
92	#define EPOCH_YEAR 1970
93	#define EPOCH_WDAY TM_THURSDAY
94
95	/*
96	** Accurate only for the past couple of centuries;
97	** that will probably do.
98	*/
99
100	#define isleap(y) (((y) % 4) == 0 && ((y) % 100) != 0 \|\| ((y) % 400) == 0)