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6949fc73 | 1 | /* |
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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 | |
1b71c7c8 | 6 | * Arthur David Olson of the National Cancer Institute. |
47ae2e1a | 7 | * |
269a7923 | 8 | * %sccs.include.redist.c% |
47ae2e1a | 9 | * |
1b71c7c8 | 10 | * @(#)tzfile.h 5.9 (Berkeley) %G% |
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11 | */ |
12 | ||
13 | /* | |
14 | ** Information about time zone files. | |
15 | */ | |
16 | ||
45adb1b0 | 17 | /* Time zone object file directory */ |
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18 | #define TZDIR "/usr/share/zoneinfo" |
19 | #define TZDEFAULT "/etc/localtime" | |
ceb03641 | 20 | #define TZDEFRULES "posixrules" |
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21 | |
22 | /* | |
23 | ** Each file begins with. . . | |
24 | */ | |
25 | ||
26 | struct tzhead { | |
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27 | char tzh_reserved[24]; /* reserved for future use */ |
28 | char tzh_ttisstdcnt[4]; /* coded number of trans. time flags */ | |
29 | char tzh_leapcnt[4]; /* coded number of leap seconds */ | |
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30 | char tzh_timecnt[4]; /* coded number of transition times */ |
31 | char tzh_typecnt[4]; /* coded number of local time types */ | |
32 | char tzh_charcnt[4]; /* coded number of abbr. chars */ | |
33 | }; | |
34 | ||
35 | /* | |
36 | ** . . .followed by. . . | |
37 | ** | |
38 | ** tzh_timecnt (char [4])s coded transition times a la time(2) | |
39 | ** tzh_timecnt (unsigned char)s types of local time starting at above | |
40 | ** tzh_typecnt repetitions of | |
41 | ** one (char [4]) coded GMT offset in seconds | |
ceb03641 | 42 | ** one (unsigned char) used to set tm_isdst |
6949fc73 | 43 | ** one (unsigned char) that's an abbreviation list index |
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44 | ** tzh_charcnt (char)s '\0'-terminated zone abbreviations |
45 | ** tzh_leapcnt repetitions of | |
46 | ** one (char [4]) coded leap second transition times | |
47 | ** one (char [4]) total correction after above | |
48 | ** tzh_ttisstdcnt (char)s indexed by type; if TRUE, transition | |
49 | ** time is standard time, if FALSE, | |
50 | ** transition time is wall clock time | |
51 | ** if absent, transition times are | |
52 | ** assumed to be wall clock time | |
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53 | */ |
54 | ||
55 | /* | |
56 | ** In the current implementation, "tzset()" refuses to deal with files that | |
57 | ** exceed any of the limits below. | |
58 | */ | |
59 | ||
60 | /* | |
61 | ** The TZ_MAX_TIMES value below is enough to handle a bit more than a | |
62 | ** year's worth of solar time (corrected daily to the nearest second) or | |
63 | ** 138 years of Pacific Presidential Election time | |
64 | ** (where there are three time zone transitions every fourth year). | |
65 | */ | |
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66 | #define TZ_MAX_TIMES 370 |
67 | ||
68 | #define NOSOLAR /* 4BSD doesn't currently handle solar time */ | |
69 | ||
70 | #ifndef NOSOLAR | |
71 | #define TZ_MAX_TYPES 256 /* Limited by what (unsigned char)'s can hold */ | |
72 | #else | |
73 | #define TZ_MAX_TYPES 10 /* Maximum number of local time types */ | |
74 | #endif | |
75 | ||
76 | #define TZ_MAX_CHARS 50 /* Maximum number of abbreviation characters */ | |
77 | ||
78 | #define TZ_MAX_LEAPS 50 /* Maximum number of leap second corrections */ | |
79 | ||
80 | #define SECSPERMIN 60 | |
81 | #define MINSPERHOUR 60 | |
82 | #define HOURSPERDAY 24 | |
83 | #define DAYSPERWEEK 7 | |
84 | #define DAYSPERNYEAR 365 | |
85 | #define DAYSPERLYEAR 366 | |
86 | #define SECSPERHOUR (SECSPERMIN * MINSPERHOUR) | |
87 | #define SECSPERDAY ((long) SECSPERHOUR * HOURSPERDAY) | |
88 | #define MONSPERYEAR 12 | |
89 | ||
90 | #define TM_SUNDAY 0 | |
91 | #define TM_MONDAY 1 | |
92 | #define TM_TUESDAY 2 | |
93 | #define TM_WEDNESDAY 3 | |
94 | #define TM_THURSDAY 4 | |
95 | #define TM_FRIDAY 5 | |
96 | #define TM_SATURDAY 6 | |
97 | ||
98 | #define TM_JANUARY 0 | |
99 | #define TM_FEBRUARY 1 | |
100 | #define TM_MARCH 2 | |
101 | #define TM_APRIL 3 | |
102 | #define TM_MAY 4 | |
103 | #define TM_JUNE 5 | |
104 | #define TM_JULY 6 | |
105 | #define TM_AUGUST 7 | |
106 | #define TM_SEPTEMBER 8 | |
107 | #define TM_OCTOBER 9 | |
108 | #define TM_NOVEMBER 10 | |
109 | #define TM_DECEMBER 11 | |
110 | ||
111 | #define TM_YEAR_BASE 1900 | |
112 | ||
113 | #define EPOCH_YEAR 1970 | |
114 | #define EPOCH_WDAY TM_THURSDAY | |
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115 | |
116 | /* | |
117 | ** Accurate only for the past couple of centuries; | |
118 | ** that will probably do. | |
119 | */ | |
120 | ||
ceb03641 | 121 | #define isleap(y) (((y) % 4) == 0 && ((y) % 100) != 0 || ((y) % 400) == 0) |