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comparison: intl/icu/source/tools/tzcode/tzfile.h

intl/icu/source/tools/tzcode/tzfile.h

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1 #ifndef TZFILE_H
2
3 #define TZFILE_H
4
5 /*
6 ** This file is in the public domain, so clarified as of
7 ** 1996-06-05 by Arthur David Olson.
8 */
9
10 /*
11 ** This header is for use ONLY with the time conversion code.
12 ** There is no guarantee that it will remain unchanged,
13 ** or that it will remain at all.
14 ** Do NOT copy it to any system include directory.
15 ** Thank you!
16 */
17
18 /*
19 ** ID
20 */
21
22 #ifndef lint
23 #ifndef NOID
24 static char tzfilehid[] = "@(#)tzfile.h 8.1";
25 #endif /* !defined NOID */
26 #endif /* !defined lint */
27
28 /*
29 ** Information about time zone files.
30 */
31
32 #ifndef TZDIR
33 #define TZDIR "/usr/local/etc/zoneinfo" /* Time zone object file directory */
34 #endif /* !defined TZDIR */
35
36 #ifndef TZDEFAULT
37 #define TZDEFAULT "localtime"
38 #endif /* !defined TZDEFAULT */
39
40 #ifndef TZDEFRULES
41 #define TZDEFRULES "posixrules"
42 #endif /* !defined TZDEFRULES */
43
44 /*
45 ** Each file begins with. . .
46 */
47
48 #define TZ_MAGIC "TZif"
49
50 struct tzhead {
51 char tzh_magic[4]; /* TZ_MAGIC */
52 char tzh_version[1]; /* '\0' or '2' as of 2005 */
53 char tzh_reserved[15]; /* reserved--must be zero */
54 char tzh_ttisgmtcnt[4]; /* coded number of trans. time flags */
55 char tzh_ttisstdcnt[4]; /* coded number of trans. time flags */
56 char tzh_leapcnt[4]; /* coded number of leap seconds */
57 char tzh_timecnt[4]; /* coded number of transition times */
58 char tzh_typecnt[4]; /* coded number of local time types */
59 char tzh_charcnt[4]; /* coded number of abbr. chars */
60 };
61
62 /*
63 ** . . .followed by. . .
64 **
65 ** tzh_timecnt (char [4])s coded transition times a la time(2)
66 ** tzh_timecnt (unsigned char)s types of local time starting at above
67 ** tzh_typecnt repetitions of
68 ** one (char [4]) coded UTC offset in seconds
69 ** one (unsigned char) used to set tm_isdst
70 ** one (unsigned char) that's an abbreviation list index
71 ** tzh_charcnt (char)s '\0'-terminated zone abbreviations
72 ** tzh_leapcnt repetitions of
73 ** one (char [4]) coded leap second transition times
74 ** one (char [4]) total correction after above
75 ** tzh_ttisstdcnt (char)s indexed by type; if TRUE, transition
76 ** time is standard time, if FALSE,
77 ** transition time is wall clock time
78 ** if absent, transition times are
79 ** assumed to be wall clock time
80 ** tzh_ttisgmtcnt (char)s indexed by type; if TRUE, transition
81 ** time is UTC, if FALSE,
82 ** transition time is local time
83 ** if absent, transition times are
84 ** assumed to be local time
85 */
86
87 /*
88 ** If tzh_version is '2' or greater, the above is followed by a second instance
89 ** of tzhead and a second instance of the data in which each coded transition
90 ** time uses 8 rather than 4 chars,
91 ** then a POSIX-TZ-environment-variable-style string for use in handling
92 ** instants after the last transition time stored in the file
93 ** (with nothing between the newlines if there is no POSIX representation for
94 ** such instants).
95 */
96
97 /*
98 ** In the current implementation, "tzset()" refuses to deal with files that
99 ** exceed any of the limits below.
100 */
101
102 #ifndef TZ_MAX_TIMES
103 #define TZ_MAX_TIMES 1200
104 #endif /* !defined TZ_MAX_TIMES */
105
106 #ifndef TZ_MAX_TYPES
107 #ifndef NOSOLAR
108 #define TZ_MAX_TYPES 256 /* Limited by what (unsigned char)'s can hold */
109 #endif /* !defined NOSOLAR */
110 #ifdef NOSOLAR
111 /*
112 ** Must be at least 14 for Europe/Riga as of Jan 12 1995,
113 ** as noted by Earl Chew.
114 */
115 #define TZ_MAX_TYPES 20 /* Maximum number of local time types */
116 #endif /* !defined NOSOLAR */
117 #endif /* !defined TZ_MAX_TYPES */
118
119 #ifndef TZ_MAX_CHARS
120 #define TZ_MAX_CHARS 50 /* Maximum number of abbreviation characters */
121 /* (limited by what unsigned chars can hold) */
122 #endif /* !defined TZ_MAX_CHARS */
123
124 #ifndef TZ_MAX_LEAPS
125 #define TZ_MAX_LEAPS 50 /* Maximum number of leap second corrections */
126 #endif /* !defined TZ_MAX_LEAPS */
127
128 #define SECSPERMIN 60
129 #define MINSPERHOUR 60
130 #define HOURSPERDAY 24
131 #define DAYSPERWEEK 7
132 #define DAYSPERNYEAR 365
133 #define DAYSPERLYEAR 366
134 #define SECSPERHOUR (SECSPERMIN * MINSPERHOUR)
135 #define SECSPERDAY ((long) SECSPERHOUR * HOURSPERDAY)
136 #define MONSPERYEAR 12
137
138 #define TM_SUNDAY 0
139 #define TM_MONDAY 1
140 #define TM_TUESDAY 2
141 #define TM_WEDNESDAY 3
142 #define TM_THURSDAY 4
143 #define TM_FRIDAY 5
144 #define TM_SATURDAY 6
145
146 #define TM_JANUARY 0
147 #define TM_FEBRUARY 1
148 #define TM_MARCH 2
149 #define TM_APRIL 3
150 #define TM_MAY 4
151 #define TM_JUNE 5
152 #define TM_JULY 6
153 #define TM_AUGUST 7
154 #define TM_SEPTEMBER 8
155 #define TM_OCTOBER 9
156 #define TM_NOVEMBER 10
157 #define TM_DECEMBER 11
158
159 #define TM_YEAR_BASE 1900
160
161 #define EPOCH_YEAR 1970
162 #define EPOCH_WDAY TM_THURSDAY
163
164 #define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
165
166 /*
167 ** Since everything in isleap is modulo 400 (or a factor of 400), we know that
168 ** isleap(y) == isleap(y % 400)
169 ** and so
170 ** isleap(a + b) == isleap((a + b) % 400)
171 ** or
172 ** isleap(a + b) == isleap(a % 400 + b % 400)
173 ** This is true even if % means modulo rather than Fortran remainder
174 ** (which is allowed by C89 but not C99).
175 ** We use this to avoid addition overflow problems.
176 */
177
178 #define isleap_sum(a, b) isleap((a) % 400 + (b) % 400)
179
180 #endif /* !defined TZFILE_H */

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