tzfile.h revision 1.2 
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
55struct 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_ */
153