Annotation of src/include/tzfile.h, Revision 1.7
1.7 ! agc 1: /* $NetBSD: tzfile.h,v 1.6 1998/07/30 14:11:22 kleink Exp $ */
1.3 cgd 2:
1.1 cgd 3: /*
1.5 perry 4: * Copyright (c) 1988, 1993
5: * The Regents of the University of California. All rights reserved.
1.1 cgd 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.
1.7 ! agc 18: * 3. Neither the name of the University nor the names of its contributors
1.1 cgd 19: * may be used to endorse or promote products derived from this software
20: * without specific prior written permission.
21: *
22: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32: * SUCH DAMAGE.
33: *
1.5 perry 34: * @(#)tzfile.h 8.1 (Berkeley) 6/2/93
1.1 cgd 35: */
36:
37: #ifndef _TZFILE_H_
38: #define _TZFILE_H_
39:
40: /*
41: * Information about time zone files.
42: */
43: /* Time zone object file directory */
44: #define TZDIR "/usr/share/zoneinfo"
45: #define TZDEFAULT "/etc/localtime"
46: #define TZDEFRULES "posixrules"
47:
48: /*
49: ** Each file begins with. . .
50: */
51:
1.6 kleink 52: #define TZ_MAGIC "TZif"
53:
1.1 cgd 54: struct tzhead {
1.6 kleink 55: char tzh_magic[4]; /* TZ_MAGIC */
56: char tzh_reserved[16]; /* reserved for future use */
57: char tzh_ttisgmtcnt[4]; /* coded number of trans. time flags */
1.1 cgd 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
1.6 kleink 71: ** one (char [4]) coded UTC offset in seconds
1.1 cgd 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
1.6 kleink 83: ** tzh_ttisgmtcnt (char)s indexed by type; if TRUE, transition
84: ** time is UTC, if FALSE,
85: ** transition time is wall clock time
86: ** if absent, transition times are
87: ** assumed to be local time
1.1 cgd 88: */
89:
90: /*
91: ** In the current implementation, "tzset()" refuses to deal with files that
92: ** exceed any of the limits below.
93: */
94:
95: /*
96: ** The TZ_MAX_TIMES value below is enough to handle a bit more than a
97: ** year's worth of solar time (corrected daily to the nearest second) or
98: ** 138 years of Pacific Presidential Election time
99: ** (where there are three time zone transitions every fourth year).
100: */
101: #define TZ_MAX_TIMES 370
102:
103: #define NOSOLAR /* 4BSD doesn't currently handle solar time */
104:
105: #ifndef NOSOLAR
106: #define TZ_MAX_TYPES 256 /* Limited by what (unsigned char)'s can hold */
107: #else
108: #define TZ_MAX_TYPES 10 /* Maximum number of local time types */
109: #endif
110:
111: #define TZ_MAX_CHARS 50 /* Maximum number of abbreviation characters */
112:
113: #define TZ_MAX_LEAPS 50 /* Maximum number of leap second corrections */
114:
115: #define SECSPERMIN 60
116: #define MINSPERHOUR 60
117: #define HOURSPERDAY 24
118: #define DAYSPERWEEK 7
119: #define DAYSPERNYEAR 365
120: #define DAYSPERLYEAR 366
121: #define SECSPERHOUR (SECSPERMIN * MINSPERHOUR)
122: #define SECSPERDAY ((long) SECSPERHOUR * HOURSPERDAY)
123: #define MONSPERYEAR 12
124:
125: #define TM_SUNDAY 0
126: #define TM_MONDAY 1
127: #define TM_TUESDAY 2
128: #define TM_WEDNESDAY 3
129: #define TM_THURSDAY 4
130: #define TM_FRIDAY 5
131: #define TM_SATURDAY 6
132:
133: #define TM_JANUARY 0
134: #define TM_FEBRUARY 1
135: #define TM_MARCH 2
136: #define TM_APRIL 3
137: #define TM_MAY 4
138: #define TM_JUNE 5
139: #define TM_JULY 6
140: #define TM_AUGUST 7
141: #define TM_SEPTEMBER 8
142: #define TM_OCTOBER 9
143: #define TM_NOVEMBER 10
144: #define TM_DECEMBER 11
145:
146: #define TM_YEAR_BASE 1900
147:
148: #define EPOCH_YEAR 1970
149: #define EPOCH_WDAY TM_THURSDAY
150:
151: /*
152: ** Accurate only for the past couple of centuries;
153: ** that will probably do.
154: */
155:
1.4 mikel 156: #define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0)
1.1 cgd 157:
158: #endif /* !_TZFILE_H_ */
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