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