i386: Move lapic function declarations from smp.h to apic/lapic.h
[dragonfly.git] / include / tzfile.h
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1/*
2 * @(#)tzfile.h 8.1
3 * $DragonFly: src/lib/libc/stdtime/tzfile.h,v 1.3 2008/10/19 20:15:58 swildner Exp $
4 */
5
6#ifndef TZFILE_H
7
8#define TZFILE_H
9
10/*
11** This file is in the public domain, so clarified as of
12** 1996-06-05 by Arthur David Olson.
13*/
14
15/*
16** This header is for use ONLY with the time conversion code.
17** There is no guarantee that it will remain unchanged,
18** or that it will remain at all.
19** Do NOT copy it to any system include directory.
20** Thank you!
21*/
22
23/*
24** Information about time zone files.
25*/
26
27#ifndef TZDIR
28#define TZDIR "/usr/share/zoneinfo" /* Time zone object file directory */
29#endif /* !defined TZDIR */
30
31#ifndef TZDEFAULT
32#define TZDEFAULT "/etc/localtime"
33#endif /* !defined TZDEFAULT */
34
35#ifndef TZDEFRULES
36#define TZDEFRULES "posixrules"
37#endif /* !defined TZDEFRULES */
38
39/*
40** Each file begins with. . .
41*/
42
43#define TZ_MAGIC "TZif"
44
45struct tzhead {
46 char tzh_magic[4]; /* TZ_MAGIC */
47 char tzh_version[1]; /* '\0' or '2' as of 2005 */
48 char tzh_reserved[15]; /* reserved--must be zero */
49 char tzh_ttisgmtcnt[4]; /* coded number of trans. time flags */
50 char tzh_ttisstdcnt[4]; /* coded number of trans. time flags */
51 char tzh_leapcnt[4]; /* coded number of leap seconds */
52 char tzh_timecnt[4]; /* coded number of transition times */
53 char tzh_typecnt[4]; /* coded number of local time types */
54 char tzh_charcnt[4]; /* coded number of abbr. chars */
55};
56
57/*
58** . . .followed by. . .
59**
60** tzh_timecnt (char [4])s coded transition times a la time(2)
61** tzh_timecnt (unsigned char)s types of local time starting at above
62** tzh_typecnt repetitions of
63** one (char [4]) coded UTC offset in seconds
64** one (unsigned char) used to set tm_isdst
65** one (unsigned char) that's an abbreviation list index
66** tzh_charcnt (char)s '\0'-terminated zone abbreviations
67** tzh_leapcnt repetitions of
68** one (char [4]) coded leap second transition times
69** one (char [4]) total correction after above
70** tzh_ttisstdcnt (char)s indexed by type; if TRUE, transition
71** time is standard time, if FALSE,
72** transition time is wall clock time
73** if absent, transition times are
74** assumed to be wall clock time
75** tzh_ttisgmtcnt (char)s indexed by type; if TRUE, transition
76** time is UTC, if FALSE,
77** transition time is local time
78** if absent, transition times are
79** assumed to be local time
80*/
81
82/*
83** If tzh_version is '2' or greater, the above is followed by a second instance
84** of tzhead and a second instance of the data in which each coded transition
85** time uses 8 rather than 4 chars,
86** then a POSIX-TZ-environment-variable-style string for use in handling
87** instants after the last transition time stored in the file
88** (with nothing between the newlines if there is no POSIX representation for
89** such instants).
90*/
91
92/*
93** In the current implementation, "tzset()" refuses to deal with files that
94** exceed any of the limits below.
95*/
96
97#ifndef TZ_MAX_TIMES
98#define TZ_MAX_TIMES 1200
99#endif /* !defined TZ_MAX_TIMES */
100
101#ifndef TZ_MAX_TYPES
102#ifndef NOSOLAR
103#define TZ_MAX_TYPES 256 /* Limited by what (unsigned char)'s can hold */
104#endif /* !defined NOSOLAR */
105#ifdef NOSOLAR
106/*
107** Must be at least 14 for Europe/Riga as of Jan 12 1995,
108** as noted by Earl Chew.
109*/
110#define TZ_MAX_TYPES 20 /* Maximum number of local time types */
111#endif /* !defined NOSOLAR */
112#endif /* !defined TZ_MAX_TYPES */
113
114#ifndef TZ_MAX_CHARS
115#define TZ_MAX_CHARS 50 /* Maximum number of abbreviation characters */
116 /* (limited by what unsigned chars can hold) */
117#endif /* !defined TZ_MAX_CHARS */
118
119#ifndef TZ_MAX_LEAPS
120#define TZ_MAX_LEAPS 50 /* Maximum number of leap second corrections */
121#endif /* !defined TZ_MAX_LEAPS */
122
123#define SECSPERMIN 60
124#define MINSPERHOUR 60
125#define HOURSPERDAY 24
126#define DAYSPERWEEK 7
127#define DAYSPERNYEAR 365
128#define DAYSPERLYEAR 366
129#define SECSPERHOUR (SECSPERMIN * MINSPERHOUR)
130#define SECSPERDAY ((long) SECSPERHOUR * HOURSPERDAY)
131#define MONSPERYEAR 12
132
133#define TM_SUNDAY 0
134#define TM_MONDAY 1
135#define TM_TUESDAY 2
136#define TM_WEDNESDAY 3
137#define TM_THURSDAY 4
138#define TM_FRIDAY 5
139#define TM_SATURDAY 6
140
141#define TM_JANUARY 0
142#define TM_FEBRUARY 1
143#define TM_MARCH 2
144#define TM_APRIL 3
145#define TM_MAY 4
146#define TM_JUNE 5
147#define TM_JULY 6
148#define TM_AUGUST 7
149#define TM_SEPTEMBER 8
150#define TM_OCTOBER 9
151#define TM_NOVEMBER 10
152#define TM_DECEMBER 11
153
154#define TM_YEAR_BASE 1900
155
156#define EPOCH_YEAR 1970
157#define EPOCH_WDAY TM_THURSDAY
158
159#define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
160
161/*
162** Since everything in isleap is modulo 400 (or a factor of 400), we know that
163** isleap(y) == isleap(y % 400)
164** and so
165** isleap(a + b) == isleap((a + b) % 400)
166** or
167** isleap(a + b) == isleap(a % 400 + b % 400)
168** This is true even if % means modulo rather than Fortran remainder
169** (which is allowed by C89 but not C99).
170** We use this to avoid addition overflow problems.
171*/
172
173#define isleap_sum(a, b) isleap((a) % 400 + (b) % 400)
174
175#endif /* !defined TZFILE_H */