6 ** This file is in the public domain, so clarified as of
7 ** 1996-06-05 by Arthur David Olson (arthur_david_olson@nih.gov).
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.
25 static char tzfilehid[] = "@(#)tzfile.h 7.14";
27 #endif /* !defined NOID */
28 #endif /* !defined lint */
31 ** Information about time zone files.
35 #define TZDIR "/usr/share/zoneinfo" /* Time zone object file directory */
36 #endif /* !defined TZDIR */
39 #define TZDEFAULT "/etc/localtime"
40 #endif /* !defined TZDEFAULT */
43 #define TZDEFRULES "posixrules"
44 #endif /* !defined TZDEFRULES */
47 ** Each file begins with. . .
50 #define TZ_MAGIC "TZif"
53 char tzh_magic[4]; /* TZ_MAGIC */
54 char tzh_reserved[16]; /* reserved for future use */
55 char tzh_ttisgmtcnt[4]; /* coded number of trans. time flags */
56 char tzh_ttisstdcnt[4]; /* coded number of trans. time flags */
57 char tzh_leapcnt[4]; /* coded number of leap seconds */
58 char tzh_timecnt[4]; /* coded number of transition times */
59 char tzh_typecnt[4]; /* coded number of local time types */
60 char tzh_charcnt[4]; /* coded number of abbr. chars */
64 ** . . .followed by. . .
66 ** tzh_timecnt (char [4])s coded transition times a la time(2)
67 ** tzh_timecnt (unsigned char)s types of local time starting at above
68 ** tzh_typecnt repetitions of
69 ** one (char [4]) coded UTC offset in seconds
70 ** one (unsigned char) used to set tm_isdst
71 ** one (unsigned char) that's an abbreviation list index
72 ** tzh_charcnt (char)s '\0'-terminated zone abbreviations
73 ** tzh_leapcnt repetitions of
74 ** one (char [4]) coded leap second transition times
75 ** one (char [4]) total correction after above
76 ** tzh_ttisstdcnt (char)s indexed by type; if TRUE, transition
77 ** time is standard time, if FALSE,
78 ** transition time is wall clock time
79 ** if absent, transition times are
80 ** assumed to be wall clock time
81 ** tzh_ttisgmtcnt (char)s indexed by type; if TRUE, transition
82 ** time is UTC, if FALSE,
83 ** transition time is local time
84 ** if absent, transition times are
85 ** assumed to be local time
89 ** In the current implementation, "tzset()" refuses to deal with files that
90 ** exceed any of the limits below.
95 ** The TZ_MAX_TIMES value below is enough to handle a bit more than a
96 ** year's worth of solar time (corrected daily to the nearest second) or
97 ** 138 years of Pacific Presidential Election time
98 ** (where there are three time zone transitions every fourth year).
100 #define TZ_MAX_TIMES 370
101 #endif /* !defined TZ_MAX_TIMES */
105 #define TZ_MAX_TYPES 256 /* Limited by what (unsigned char)'s can hold */
106 #endif /* !defined NOSOLAR */
109 ** Must be at least 14 for Europe/Riga as of Jan 12 1995,
110 ** as noted by Earl Chew <earl@hpato.aus.hp.com>.
112 #define TZ_MAX_TYPES 20 /* Maximum number of local time types */
113 #endif /* !defined NOSOLAR */
114 #endif /* !defined TZ_MAX_TYPES */
117 #define TZ_MAX_CHARS 50 /* Maximum number of abbreviation characters */
118 /* (limited by what unsigned chars can hold) */
119 #endif /* !defined TZ_MAX_CHARS */
122 #define TZ_MAX_LEAPS 50 /* Maximum number of leap second corrections */
123 #endif /* !defined TZ_MAX_LEAPS */
125 #define SECSPERMIN 60
126 #define MINSPERHOUR 60
127 #define HOURSPERDAY 24
128 #define DAYSPERWEEK 7
129 #define DAYSPERNYEAR 365
130 #define DAYSPERLYEAR 366
131 #define SECSPERHOUR (SECSPERMIN * MINSPERHOUR)
132 #define SECSPERDAY ((long) SECSPERHOUR * HOURSPERDAY)
133 #define MONSPERYEAR 12
138 #define TM_WEDNESDAY 3
139 #define TM_THURSDAY 4
141 #define TM_SATURDAY 6
144 #define TM_FEBRUARY 1
151 #define TM_SEPTEMBER 8
153 #define TM_NOVEMBER 10
154 #define TM_DECEMBER 11
156 #define TM_YEAR_BASE 1900
158 #define EPOCH_YEAR 1970
159 #define EPOCH_WDAY TM_THURSDAY
162 ** Accurate only for the past couple of centuries;
163 ** that will probably do.
166 #define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
171 ** Use of the underscored variants may cause problems if you move your code to
172 ** certain System-V-based systems; for maximum portability, use the
173 ** underscore-free variants. The underscored variants are provided for
174 ** backward compatibility only; they may disappear from future versions of
178 #define SECS_PER_MIN SECSPERMIN
179 #define MINS_PER_HOUR MINSPERHOUR
180 #define HOURS_PER_DAY HOURSPERDAY
181 #define DAYS_PER_WEEK DAYSPERWEEK
182 #define DAYS_PER_NYEAR DAYSPERNYEAR
183 #define DAYS_PER_LYEAR DAYSPERLYEAR
184 #define SECS_PER_HOUR SECSPERHOUR
185 #define SECS_PER_DAY SECSPERDAY
186 #define MONS_PER_YEAR MONSPERYEAR
188 #endif /* !defined USG */
190 #endif /* !defined TZFILE_H */