1#ifndef TZFILE_INCLUDED
2#define TZFILE_INCLUDED
3
4/* Copyright (c) 2004, 2006, 2007 MySQL AB, 2009 Sun Microsystems, Inc.
5 Use is subject to license terms.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; version 2 of the License.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
19
20/*
21 This file is based on public domain code from ftp://elsie.ncih.nist.gov/
22 Initial source code is in the public domain, so clarified as of
23 1996-06-05 by Arthur David Olson (arthur_david_olson@nih.gov).
24*/
25
26/*
27 Information about time zone files.
28*/
29
30#ifndef TZDIR
31#define TZDIR "/usr/share/zoneinfo" /* Time zone object file directory */
32#endif /* !defined TZDIR */
33
34/*
35 Each file begins with. . .
36*/
37
38#define TZ_MAGIC "TZif"
39
40struct tzhead {
41 uchar tzh_magic[4]; /* TZ_MAGIC */
42 uchar tzh_reserved[16]; /* reserved for future use */
43 uchar tzh_ttisgmtcnt[4]; /* coded number of trans. time flags */
44 uchar tzh_ttisstdcnt[4]; /* coded number of trans. time flags */
45 uchar tzh_leapcnt[4]; /* coded number of leap seconds */
46 uchar tzh_timecnt[4]; /* coded number of transition times */
47 uchar tzh_typecnt[4]; /* coded number of local time types */
48 uchar tzh_charcnt[4]; /* coded number of abbr. chars */
49};
50
51/*
52 . . .followed by. . .
53
54 tzh_timecnt (char [4])s coded transition times a la time(2)
55 tzh_timecnt (unsigned char)s types of local time starting at above
56 tzh_typecnt repetitions of
57 one (char [4]) coded UTC offset in seconds
58 one (unsigned char) used to set tm_isdst
59 one (unsigned char) that's an abbreviation list index
60 tzh_charcnt (char)s '\0'-terminated zone abbreviations
61 tzh_leapcnt repetitions of
62 one (char [4]) coded leap second transition times
63 one (char [4]) total correction after above
64 tzh_ttisstdcnt (char)s indexed by type; if TRUE, transition
65 time is standard time, if FALSE,
66 transition time is wall clock time
67 if absent, transition times are
68 assumed to be wall clock time
69 tzh_ttisgmtcnt (char)s indexed by type; if TRUE, transition
70 time is UTC, if FALSE,
71 transition time is local time
72 if absent, transition times are
73 assumed to be local time
74*/
75
76/*
77 In the current implementation, we refuse to deal with files that
78 exceed any of the limits below.
79*/
80
81#ifndef TZ_MAX_TIMES
82/*
83 The TZ_MAX_TIMES value below is enough to handle a bit more than a
84 year's worth of solar time (corrected daily to the nearest second) or
85 138 years of Pacific Presidential Election time
86 (where there are three time zone transitions every fourth year).
87*/
88#define TZ_MAX_TIMES 370
89#endif /* !defined TZ_MAX_TIMES */
90
91#ifndef TZ_MAX_TYPES
92#ifdef SOLAR
93#define TZ_MAX_TYPES 256 /* Limited by what (unsigned char)'s can hold */
94#else
95/*
96 Must be at least 14 for Europe/Riga as of Jan 12 1995,
97 as noted by Earl Chew <earl@hpato.aus.hp.com>.
98*/
99#define TZ_MAX_TYPES 20 /* Maximum number of local time types */
100#endif /* defined SOLAR */
101#endif /* !defined TZ_MAX_TYPES */
102
103#ifndef TZ_MAX_CHARS
104#define TZ_MAX_CHARS 50 /* Maximum number of abbreviation characters */
105 /* (limited by what unsigned chars can hold) */
106#endif /* !defined TZ_MAX_CHARS */
107
108#ifndef TZ_MAX_LEAPS
109#define TZ_MAX_LEAPS 50 /* Maximum number of leap second corrections */
110#endif /* !defined TZ_MAX_LEAPS */
111
112#ifndef TZ_MAX_REV_RANGES
113#ifdef SOLAR
114/* Solar (Asia/RiyadhXX) zones need significantly bigger TZ_MAX_REV_RANGES */
115#define TZ_MAX_REV_RANGES (TZ_MAX_TIMES*2+TZ_MAX_LEAPS*2+2)
116#else
117#define TZ_MAX_REV_RANGES (TZ_MAX_TIMES+TZ_MAX_LEAPS+2)
118#endif
119#endif
120
121#define SECS_PER_MIN 60
122#define MINS_PER_HOUR 60
123#define HOURS_PER_DAY 24
124#define DAYS_PER_WEEK 7
125#define DAYS_PER_NYEAR 365
126#define DAYS_PER_LYEAR 366
127#define SECS_PER_HOUR (SECS_PER_MIN * MINS_PER_HOUR)
128#define SECS_PER_DAY ((long) SECS_PER_HOUR * HOURS_PER_DAY)
129#define MONS_PER_YEAR 12
130
131#define TM_YEAR_BASE 1900
132
133#define EPOCH_YEAR 1970
134
135/*
136 Accurate only for the past couple of centuries,
137 that will probably do.
138*/
139
140#define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
141
142#endif
143