tzfile.h revision 2713 
1#ifndef TZFILE_H
2
3#define TZFILE_H
4
5/*
6** This header is for use ONLY with the time conversion code.
7** There is no guarantee that it will remain unchanged,
8** or that it will remain at all.
9** Do NOT copy it to any system include directory.
10** Thank you!
11*/
12
13/*
14** ID
15*/
16
17#ifndef lint
18#ifndef NOID
19static char	tzfilehid[] = "@(#)tzfile.h	7.4";
20#endif /* !defined NOID */
21#endif /* !defined lint */
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
43struct tzhead {
44	char	tzh_reserved[24];	/* reserved for future use */
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 GMT 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*/
71
72/*
73** In the current implementation, "tzset()" refuses to deal with files that
74** exceed any of the limits below.
75*/
76
77#ifndef TZ_MAX_TIMES
78/*
79** The TZ_MAX_TIMES value below is enough to handle a bit more than a
80** year's worth of solar time (corrected daily to the nearest second) or
81** 138 years of Pacific Presidential Election time
82** (where there are three time zone transitions every fourth year).
83*/
84#define TZ_MAX_TIMES	370
85#endif /* !defined TZ_MAX_TIMES */
86
87#ifndef TZ_MAX_TYPES
88#ifndef NOSOLAR
89#define TZ_MAX_TYPES	256 /* Limited by what (unsigned char)'s can hold */
90#endif /* !defined NOSOLAR */
91#ifdef NOSOLAR
92#define TZ_MAX_TYPES	10	/* Maximum number of local time types */
93#endif /* !defined NOSOLAR */
94#endif /* !defined TZ_MAX_TYPES */
95
96#ifndef TZ_MAX_CHARS
97#define TZ_MAX_CHARS	50	/* Maximum number of abbreviation characters */
98				/* (limited by what unsigned chars can hold) */
99#endif /* !defined TZ_MAX_CHARS */
100
101#ifndef TZ_MAX_LEAPS
102#define TZ_MAX_LEAPS	50	/* Maximum number of leap second corrections */
103#endif /* !defined TZ_MAX_LEAPS */
104
105#define SECSPERMIN	60
106#define MINSPERHOUR	60
107#define HOURSPERDAY	24
108#define DAYSPERWEEK	7
109#define DAYSPERNYEAR	365
110#define DAYSPERLYEAR	366
111#define SECSPERHOUR	(SECSPERMIN * MINSPERHOUR)
112#define SECSPERDAY	((long) SECSPERHOUR * HOURSPERDAY)
113#define MONSPERYEAR	12
114
115#define TM_SUNDAY	0
116#define TM_MONDAY	1
117#define TM_TUESDAY	2
118#define TM_WEDNESDAY	3
119#define TM_THURSDAY	4
120#define TM_FRIDAY	5
121#define TM_SATURDAY	6
122
123#define TM_JANUARY	0
124#define TM_FEBRUARY	1
125#define TM_MARCH	2
126#define TM_APRIL	3
127#define TM_MAY		4
128#define TM_JUNE		5
129#define TM_JULY		6
130#define TM_AUGUST	7
131#define TM_SEPTEMBER	8
132#define TM_OCTOBER	9
133#define TM_NOVEMBER	10
134#define TM_DECEMBER	11
135
136#define TM_YEAR_BASE	1900
137
138#define EPOCH_YEAR	1970
139#define EPOCH_WDAY	TM_THURSDAY
140
141/*
142** Accurate only for the past couple of centuries;
143** that will probably do.
144*/
145
146#define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0)
147
148#ifndef USG
149
150/*
151** Use of the underscored variants may cause problems if you move your code to
152** certain System-V-based systems; for maximum portability, use the
153** underscore-free variants.  The underscored variants are provided for
154** backward compatibility only; they may disappear from future versions of
155** this file.
156*/
157
158#define SECS_PER_MIN	SECSPERMIN
159#define MINS_PER_HOUR	MINSPERHOUR
160#define HOURS_PER_DAY	HOURSPERDAY
161#define DAYS_PER_WEEK	DAYSPERWEEK
162#define DAYS_PER_NYEAR	DAYSPERNYEAR
163#define DAYS_PER_LYEAR	DAYSPERLYEAR
164#define SECS_PER_HOUR	SECSPERHOUR
165#define SECS_PER_DAY	SECSPERDAY
166#define MONS_PER_YEAR	MONSPERYEAR
167
168#endif /* !defined USG */
169
170#endif /* !defined TZFILE_H */
171