Asterisk - The Open Source Telephony Project GIT-master-f3e88d3
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
24static char __attribute__((unused)) 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#ifdef SOLARIS
34#define TZDIR "/usr/share/lib/zoneinfo"
35#else
36#define TZDIR "/usr/share/zoneinfo"
37#endif /* defined SOLARIS */
38#endif /* !defined TZDIR */
39
40#ifndef TZDEFAULT
41#define TZDEFAULT "localtime"
42#endif /* !defined TZDEFAULT */
43
44#ifndef TZDEFRULES
45#define TZDEFRULES "posixrules"
46#endif /* !defined TZDEFRULES */
47
48/*
49** Each file begins with. . .
50*/
51
52#define TZ_MAGIC "TZif"
53
54struct tzhead {
55 char tzh_magic[4]; /* TZ_MAGIC */
56 char tzh_version[1]; /* '\0' or '2' as of 2005 */
57 char tzh_reserved[15]; /* reserved--must be zero */
58 char tzh_ttisgmtcnt[4]; /* coded number of trans. time flags */
59 char tzh_ttisstdcnt[4]; /* coded number of trans. time flags */
60 char tzh_leapcnt[4]; /* coded number of leap seconds */
61 char tzh_timecnt[4]; /* coded number of transition times */
62 char tzh_typecnt[4]; /* coded number of local time types */
63 char tzh_charcnt[4]; /* coded number of abbr. chars */
64};
65
66/*
67** . . .followed by. . .
68**
69** tzh_timecnt (char [4])s coded transition times a la time(2)
70** tzh_timecnt (unsigned char)s types of local time starting at above
71** tzh_typecnt repetitions of
72** one (char [4]) coded UTC offset in seconds
73** one (unsigned char) used to set tm_isdst
74** one (unsigned char) that's an abbreviation list index
75** tzh_charcnt (char)s '\0'-terminated zone abbreviations
76** tzh_leapcnt repetitions of
77** one (char [4]) coded leap second transition times
78** one (char [4]) total correction after above
79** tzh_ttisstdcnt (char)s indexed by type; if TRUE, transition
80** time is standard time, if FALSE,
81** transition time is wall clock time
82** if absent, transition times are
83** assumed to be wall clock time
84** tzh_ttisgmtcnt (char)s indexed by type; if TRUE, transition
85** time is UTC, if FALSE,
86** transition time is local time
87** if absent, transition times are
88** assumed to be local time
89*/
90
91/*
92** If tzh_version is '2' or greater, the above is followed by a second instance
93** of tzhead and a second instance of the data in which each coded transition
94** time uses 8 rather than 4 chars,
95** then a POSIX-TZ-environment-variable-style string for use in handling
96** instants after the last transition time stored in the file
97** (with nothing between the newlines if there is no POSIX representation for
98** such instants).
99*/
100
101/*
102** In the current implementation, "tzset()" refuses to deal with files that
103** exceed any of the limits below.
104*/
105
106#ifndef TZ_MAX_TIMES
107#define TZ_MAX_TIMES 1200
108#endif /* !defined TZ_MAX_TIMES */
109
110#ifndef TZ_MAX_TYPES
111#ifndef NOSOLAR
112#define TZ_MAX_TYPES 256 /* Limited by what (unsigned char)'s can hold */
113#endif /* !defined NOSOLAR */
114#ifdef NOSOLAR
115/*
116** Must be at least 14 for Europe/Riga as of Jan 12 1995,
117** as noted by Earl Chew.
118*/
119#define TZ_MAX_TYPES 20 /* Maximum number of local time types */
120#endif /* !defined NOSOLAR */
121#endif /* !defined TZ_MAX_TYPES */
122
123#ifndef TZ_MAX_CHARS
124#define TZ_MAX_CHARS 50 /* Maximum number of abbreviation characters */
125 /* (limited by what unsigned chars can hold) */
126#endif /* !defined TZ_MAX_CHARS */
127
128#ifndef TZ_MAX_LEAPS
129#define TZ_MAX_LEAPS 50 /* Maximum number of leap second corrections */
130#endif /* !defined TZ_MAX_LEAPS */
131
132#define SECSPERMIN 60
133#define MINSPERHOUR 60
134#define HOURSPERDAY 24
135#define DAYSPERWEEK 7
136#define DAYSPERNYEAR 365
137#define DAYSPERLYEAR 366
138#define SECSPERHOUR (SECSPERMIN * MINSPERHOUR)
139#define SECSPERDAY ((long) SECSPERHOUR * HOURSPERDAY)
140#define MONSPERYEAR 12
141
142#define TM_SUNDAY 0
143#define TM_MONDAY 1
144#define TM_TUESDAY 2
145#define TM_WEDNESDAY 3
146#define TM_THURSDAY 4
147#define TM_FRIDAY 5
148#define TM_SATURDAY 6
149
150#define TM_JANUARY 0
151#define TM_FEBRUARY 1
152#define TM_MARCH 2
153#define TM_APRIL 3
154#define TM_MAY 4
155#define TM_JUNE 5
156#define TM_JULY 6
157#define TM_AUGUST 7
158#define TM_SEPTEMBER 8
159#define TM_OCTOBER 9
160#define TM_NOVEMBER 10
161#define TM_DECEMBER 11
162
163#define TM_YEAR_BASE 1900
164
165#define EPOCH_YEAR 1970
166#define EPOCH_WDAY TM_THURSDAY
167
168#define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
169
170/*
171** Since everything in isleap is modulo 400 (or a factor of 400), we know that
172** isleap(y) == isleap(y % 400)
173** and so
174** isleap(a + b) == isleap((a + b) % 400)
175** or
176** isleap(a + b) == isleap(a % 400 + b % 400)
177** This is true even if % means modulo rather than Fortran remainder
178** (which is allowed by C89 but not C99).
179** We use this to avoid addition overflow problems.
180*/
181
182#define isleap_sum(a, b) isleap((a) % 400 + (b) % 400)
183
184#endif /* !defined TZFILE_H */
Definition: tzfile.h:54
char tzh_version[1]
Definition: tzfile.h:56
char tzh_ttisstdcnt[4]
Definition: tzfile.h:59
char tzh_charcnt[4]
Definition: tzfile.h:63
char tzh_ttisgmtcnt[4]
Definition: tzfile.h:58
char tzh_typecnt[4]
Definition: tzfile.h:62
char tzh_leapcnt[4]
Definition: tzfile.h:60
char tzh_magic[4]
Definition: tzfile.h:55
char tzh_reserved[15]
Definition: tzfile.h:57
char tzh_timecnt[4]
Definition: tzfile.h:61
static char tzfilehid[]
Definition: tzfile.h:24