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1.1 root 1: /*
2: * Copyright (c) 1988 Regents of the University of California.
3: * All rights reserved.
4: *
5: * This code is derived from software contributed to Berkeley by
6: * Arthur David Olson of the National Cancer Institute.
7: *
8: * Redistribution and use in source and binary forms are permitted provided
9: * that: (1) source distributions retain this entire copyright notice and
10: * comment, and (2) distributions including binaries display the following
11: * acknowledgement: ``This product includes software developed by the
12: * University of California, Berkeley and its contributors'' in the
13: * documentation or other materials provided with the distribution and in
14: * all advertising materials mentioning features or use of this software.
15: * Neither the name of the University nor the names of its contributors may
16: * be used to endorse or promote products derived from this software without
17: * specific prior written permission.
18: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
19: * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
20: * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
21: *
22: * @(#)tzfile.h 5.9 (Berkeley) 6/11/90
23: */
24:
25: /*
26: ** Information about time zone files.
27: */
28:
29: /* Time zone object file directory */
30: #define TZDIR "/usr/share/zoneinfo"
31: #define TZDEFAULT "/etc/localtime"
32: #define TZDEFRULES "posixrules"
33:
34: /*
35: ** Each file begins with. . .
36: */
37:
38: struct tzhead {
39: char tzh_reserved[24]; /* reserved for future use */
40: char tzh_ttisstdcnt[4]; /* coded number of trans. time flags */
41: char tzh_leapcnt[4]; /* coded number of leap seconds */
42: char tzh_timecnt[4]; /* coded number of transition times */
43: char tzh_typecnt[4]; /* coded number of local time types */
44: char tzh_charcnt[4]; /* coded number of abbr. chars */
45: };
46:
47: /*
48: ** . . .followed by. . .
49: **
50: ** tzh_timecnt (char [4])s coded transition times a la time(2)
51: ** tzh_timecnt (unsigned char)s types of local time starting at above
52: ** tzh_typecnt repetitions of
53: ** one (char [4]) coded GMT offset in seconds
54: ** one (unsigned char) used to set tm_isdst
55: ** one (unsigned char) that's an abbreviation list index
56: ** tzh_charcnt (char)s '\0'-terminated zone abbreviations
57: ** tzh_leapcnt repetitions of
58: ** one (char [4]) coded leap second transition times
59: ** one (char [4]) total correction after above
60: ** tzh_ttisstdcnt (char)s indexed by type; if TRUE, transition
61: ** time is standard time, if FALSE,
62: ** transition time is wall clock time
63: ** if absent, transition times are
64: ** assumed to be wall clock time
65: */
66:
67: /*
68: ** In the current implementation, "tzset()" refuses to deal with files that
69: ** exceed any of the limits below.
70: */
71:
72: /*
73: ** The TZ_MAX_TIMES value below is enough to handle a bit more than a
74: ** year's worth of solar time (corrected daily to the nearest second) or
75: ** 138 years of Pacific Presidential Election time
76: ** (where there are three time zone transitions every fourth year).
77: */
78: #define TZ_MAX_TIMES 370
79:
80: #define NOSOLAR /* 4BSD doesn't currently handle solar time */
81:
82: #ifndef NOSOLAR
83: #define TZ_MAX_TYPES 256 /* Limited by what (unsigned char)'s can hold */
84: #else
85: #define TZ_MAX_TYPES 10 /* Maximum number of local time types */
86: #endif
87:
88: #define TZ_MAX_CHARS 50 /* Maximum number of abbreviation characters */
89:
90: #define TZ_MAX_LEAPS 50 /* Maximum number of leap second corrections */
91:
92: #define SECSPERMIN 60
93: #define MINSPERHOUR 60
94: #define HOURSPERDAY 24
95: #define DAYSPERWEEK 7
96: #define DAYSPERNYEAR 365
97: #define DAYSPERLYEAR 366
98: #define SECSPERHOUR (SECSPERMIN * MINSPERHOUR)
99: #define SECSPERDAY ((long) SECSPERHOUR * HOURSPERDAY)
100: #define MONSPERYEAR 12
101:
102: #define TM_SUNDAY 0
103: #define TM_MONDAY 1
104: #define TM_TUESDAY 2
105: #define TM_WEDNESDAY 3
106: #define TM_THURSDAY 4
107: #define TM_FRIDAY 5
108: #define TM_SATURDAY 6
109:
110: #define TM_JANUARY 0
111: #define TM_FEBRUARY 1
112: #define TM_MARCH 2
113: #define TM_APRIL 3
114: #define TM_MAY 4
115: #define TM_JUNE 5
116: #define TM_JULY 6
117: #define TM_AUGUST 7
118: #define TM_SEPTEMBER 8
119: #define TM_OCTOBER 9
120: #define TM_NOVEMBER 10
121: #define TM_DECEMBER 11
122:
123: #define TM_YEAR_BASE 1900
124:
125: #define EPOCH_YEAR 1970
126: #define EPOCH_WDAY TM_THURSDAY
127:
128: /*
129: ** Accurate only for the past couple of centuries;
130: ** that will probably do.
131: */
132:
133: #define isleap(y) (((y) % 4) == 0 && ((y) % 100) != 0 || ((y) % 400) == 0)
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