* @(#)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. . .
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 */
** 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 NOSOLAR /* We currently don't handle solar time */
#define TZ_MAX_TYPES 256 /* Limited by what (unsigned char)'s can hold */
#define TZ_MAX_TYPES 10 /* Maximum number of local time types */
#define TZ_MAX_CHARS 50 /* Maximum number of abbreviation characters */
#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 TM_YEAR_BASE 1900
#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)