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tzfile.h
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1992-01-08
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3KB
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99 lines
/*
* @(#)tzfile.h 5.2 tzfile.h 3/4/87
*/
/*
** 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. . .7'** 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))