Annotation of src/include/tzfile.h, Revision 1.1.1.1
1.1 deraadt 1: /* $NetBSD: tzfile.h,v 1.3 1994/10/26 00:56:37 cgd Exp $ */
2:
3: /*
4: * Copyright (c) 1988 Regents of the University of California.
5: * All rights reserved.
6: *
7: * This code is derived from software contributed to Berkeley by
8: * Arthur David Olson of the National Cancer Institute.
9: *
10: * Redistribution and use in source and binary forms, with or without
11: * modification, are permitted provided that the following conditions
12: * are met:
13: * 1. Redistributions of source code must retain the above copyright
14: * notice, this list of conditions and the following disclaimer.
15: * 2. Redistributions in binary form must reproduce the above copyright
16: * notice, this list of conditions and the following disclaimer in the
17: * documentation and/or other materials provided with the distribution.
18: * 3. All advertising materials mentioning features or use of this software
19: * must display the following acknowledgement:
20: * This product includes software developed by the University of
21: * California, Berkeley and its contributors.
22: * 4. Neither the name of the University nor the names of its contributors
23: * may be used to endorse or promote products derived from this software
24: * without specific prior written permission.
25: *
26: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36: * SUCH DAMAGE.
37: *
38: * @(#)tzfile.h 5.10 (Berkeley) 4/3/91
39: */
40:
41: #ifndef _TZFILE_H_
42: #define _TZFILE_H_
43:
44: /*
45: * Information about time zone files.
46: */
47: /* Time zone object file directory */
48: #define TZDIR "/usr/share/zoneinfo"
49: #define TZDEFAULT "/etc/localtime"
50: #define TZDEFRULES "posixrules"
51:
52: /*
53: ** Each file begins with. . .
54: */
55:
56: struct tzhead {
57: char tzh_reserved[24]; /* reserved for future use */
58: char tzh_ttisstdcnt[4]; /* coded number of trans. time flags */
59: char tzh_leapcnt[4]; /* coded number of leap seconds */
60: char tzh_timecnt[4]; /* coded number of transition times */
61: char tzh_typecnt[4]; /* coded number of local time types */
62: char tzh_charcnt[4]; /* coded number of abbr. chars */
63: };
64:
65: /*
66: ** . . .followed by. . .
67: **
68: ** tzh_timecnt (char [4])s coded transition times a la time(2)
69: ** tzh_timecnt (unsigned char)s types of local time starting at above
70: ** tzh_typecnt repetitions of
71: ** one (char [4]) coded GMT offset in seconds
72: ** one (unsigned char) used to set tm_isdst
73: ** one (unsigned char) that's an abbreviation list index
74: ** tzh_charcnt (char)s '\0'-terminated zone abbreviations
75: ** tzh_leapcnt repetitions of
76: ** one (char [4]) coded leap second transition times
77: ** one (char [4]) total correction after above
78: ** tzh_ttisstdcnt (char)s indexed by type; if TRUE, transition
79: ** time is standard time, if FALSE,
80: ** transition time is wall clock time
81: ** if absent, transition times are
82: ** assumed to be wall clock time
83: */
84:
85: /*
86: ** In the current implementation, "tzset()" refuses to deal with files that
87: ** exceed any of the limits below.
88: */
89:
90: /*
91: ** The TZ_MAX_TIMES value below is enough to handle a bit more than a
92: ** year's worth of solar time (corrected daily to the nearest second) or
93: ** 138 years of Pacific Presidential Election time
94: ** (where there are three time zone transitions every fourth year).
95: */
96: #define TZ_MAX_TIMES 370
97:
98: #define NOSOLAR /* 4BSD doesn't currently handle solar time */
99:
100: #ifndef NOSOLAR
101: #define TZ_MAX_TYPES 256 /* Limited by what (unsigned char)'s can hold */
102: #else
103: #define TZ_MAX_TYPES 10 /* Maximum number of local time types */
104: #endif
105:
106: #define TZ_MAX_CHARS 50 /* Maximum number of abbreviation characters */
107:
108: #define TZ_MAX_LEAPS 50 /* Maximum number of leap second corrections */
109:
110: #define SECSPERMIN 60
111: #define MINSPERHOUR 60
112: #define HOURSPERDAY 24
113: #define DAYSPERWEEK 7
114: #define DAYSPERNYEAR 365
115: #define DAYSPERLYEAR 366
116: #define SECSPERHOUR (SECSPERMIN * MINSPERHOUR)
117: #define SECSPERDAY ((long) SECSPERHOUR * HOURSPERDAY)
118: #define MONSPERYEAR 12
119:
120: #define TM_SUNDAY 0
121: #define TM_MONDAY 1
122: #define TM_TUESDAY 2
123: #define TM_WEDNESDAY 3
124: #define TM_THURSDAY 4
125: #define TM_FRIDAY 5
126: #define TM_SATURDAY 6
127:
128: #define TM_JANUARY 0
129: #define TM_FEBRUARY 1
130: #define TM_MARCH 2
131: #define TM_APRIL 3
132: #define TM_MAY 4
133: #define TM_JUNE 5
134: #define TM_JULY 6
135: #define TM_AUGUST 7
136: #define TM_SEPTEMBER 8
137: #define TM_OCTOBER 9
138: #define TM_NOVEMBER 10
139: #define TM_DECEMBER 11
140:
141: #define TM_YEAR_BASE 1900
142:
143: #define EPOCH_YEAR 1970
144: #define EPOCH_WDAY TM_THURSDAY
145:
146: /*
147: ** Accurate only for the past couple of centuries;
148: ** that will probably do.
149: */
150:
151: #define isleap(y) (((y) % 4) == 0 && ((y) % 100) != 0 || ((y) % 400) == 0)
152:
153: #endif /* !_TZFILE_H_ */
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