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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, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * from: @(#)tzfile.h 5.10 (Berkeley) 4/3/91
37 * $Id: tzfile.h,v 1.2 1993/08/01 18:45:09 mycroft Exp $
38 */
39
40 #ifndef _TZFILE_H_
41 #define _TZFILE_H_
42
43 /*
44 * Information about time zone files.
45 */
46 /* Time zone object file directory */
47 #define TZDIR "/usr/share/zoneinfo"
48 #define TZDEFAULT "/etc/localtime"
49 #define TZDEFRULES "posixrules"
50
51 /*
52 ** Each file begins with. . .
53 */
54
55 struct tzhead {
56 char tzh_reserved[24]; /* reserved for future use */
57 char tzh_ttisstdcnt[4]; /* coded number of trans. time flags */
58 char tzh_leapcnt[4]; /* coded number of leap seconds */
59 char tzh_timecnt[4]; /* coded number of transition times */
60 char tzh_typecnt[4]; /* coded number of local time types */
61 char tzh_charcnt[4]; /* coded number of abbr. chars */
62 };
63
64 /*
65 ** . . .followed by. . .
66 **
67 ** tzh_timecnt (char [4])s coded transition times a la time(2)
68 ** tzh_timecnt (unsigned char)s types of local time starting at above
69 ** tzh_typecnt repetitions of
70 ** one (char [4]) coded GMT offset in seconds
71 ** one (unsigned char) used to set tm_isdst
72 ** one (unsigned char) that's an abbreviation list index
73 ** tzh_charcnt (char)s '\0'-terminated zone abbreviations
74 ** tzh_leapcnt repetitions of
75 ** one (char [4]) coded leap second transition times
76 ** one (char [4]) total correction after above
77 ** tzh_ttisstdcnt (char)s indexed by type; if TRUE, transition
78 ** time is standard time, if FALSE,
79 ** transition time is wall clock time
80 ** if absent, transition times are
81 ** assumed to be wall clock time
82 */
83
84 /*
85 ** In the current implementation, "tzset()" refuses to deal with files that
86 ** exceed any of the limits below.
87 */
88
89 /*
90 ** The TZ_MAX_TIMES value below is enough to handle a bit more than a
91 ** year's worth of solar time (corrected daily to the nearest second) or
92 ** 138 years of Pacific Presidential Election time
93 ** (where there are three time zone transitions every fourth year).
94 */
95 #define TZ_MAX_TIMES 370
96
97 #define NOSOLAR /* 4BSD doesn't currently handle solar time */
98
99 #ifndef NOSOLAR
100 #define TZ_MAX_TYPES 256 /* Limited by what (unsigned char)'s can hold */
101 #else
102 #define TZ_MAX_TYPES 10 /* Maximum number of local time types */
103 #endif
104
105 #define TZ_MAX_CHARS 50 /* Maximum number of abbreviation characters */
106
107 #define TZ_MAX_LEAPS 50 /* Maximum number of leap second corrections */
108
109 #define SECSPERMIN 60
110 #define MINSPERHOUR 60
111 #define HOURSPERDAY 24
112 #define DAYSPERWEEK 7
113 #define DAYSPERNYEAR 365
114 #define DAYSPERLYEAR 366
115 #define SECSPERHOUR (SECSPERMIN * MINSPERHOUR)
116 #define SECSPERDAY ((long) SECSPERHOUR * HOURSPERDAY)
117 #define MONSPERYEAR 12
118
119 #define TM_SUNDAY 0
120 #define TM_MONDAY 1
121 #define TM_TUESDAY 2
122 #define TM_WEDNESDAY 3
123 #define TM_THURSDAY 4
124 #define TM_FRIDAY 5
125 #define TM_SATURDAY 6
126
127 #define TM_JANUARY 0
128 #define TM_FEBRUARY 1
129 #define TM_MARCH 2
130 #define TM_APRIL 3
131 #define TM_MAY 4
132 #define TM_JUNE 5
133 #define TM_JULY 6
134 #define TM_AUGUST 7
135 #define TM_SEPTEMBER 8
136 #define TM_OCTOBER 9
137 #define TM_NOVEMBER 10
138 #define TM_DECEMBER 11
139
140 #define TM_YEAR_BASE 1900
141
142 #define EPOCH_YEAR 1970
143 #define EPOCH_WDAY TM_THURSDAY
144
145 /*
146 ** Accurate only for the past couple of centuries;
147 ** that will probably do.
148 */
149
150 #define isleap(y) (((y) % 4) == 0 && ((y) % 100) != 0 || ((y) % 400) == 0)
151
152 #endif /* !_TZFILE_H_ */