1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright 2007 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25
26 /*
27 * from Arthur Olson's 6.1
28 */
29
30 #ifndef _SYS_TZFILE_H
31 #define _SYS_TZFILE_H
32
33 #ifdef __cplusplus
34 extern "C" {
35 #endif
36
37 /*
38 * Information about time zone files.
39 */
40
41 #define TZDIR "/usr/share/lib/zoneinfo" /* Time zone object file directory */
42
43 #define TZDEFAULT (getenv("TZ"))
44
45 #define TZDEFRULES "posixrules"
46
47 /*
48 * Each file begins with. . .
49 */
50
51 struct tzhead {
52 char tzh_reserved[24]; /* reserved for future use */
53 char tzh_ttisstdcnt[4]; /* coded number of trans. time flags */
54 char tzh_leapcnt[4]; /* coded number of leap seconds */
55 char tzh_timecnt[4]; /* coded number of transition times */
56 char tzh_typecnt[4]; /* coded number of local time types */
57 char tzh_charcnt[4]; /* coded number of abbr. chars */
58 };
59
60 /*
61 * . . .followed by. . .
62 *
63 * tzh_timecnt (char [4])s coded transition times a la time(2)
64 * tzh_timecnt (unsigned char)s types of local time starting at above
65 * tzh_typecnt repetitions of
66 * one (char [4]) coded GMT offset in seconds
67 * one (unsigned char) used to set tm_isdst
68 * one (unsigned char) that's an abbreviation list index
69 * tzh_charcnt (char)s '\0'-terminated zone abbreviations
70 * tzh_leapcnt repetitions of
71 * one (char [4]) coded leap second transition times
72 * one (char [4]) total correction after above
73 * tzh_ttisstdcnt (char)s indexed by type; if TRUE, transition
74 * time is standard time, if FALSE,
75 * transition time is wall clock time
76 * if absent, transition times are
77 * assumed to be wall clock time
78 */
79
80 /*
81 * In the current implementation, "tzset()" refuses to deal with files that
82 * exceed any of the limits below.
83 */
84
85 /*
86 * The TZ_MAX_TIMES value below is enough to handle a bit more than a
87 * year's worth of solar time (corrected daily to the nearest second) or
88 * 138 years of Pacific Presidential Election time
89 * (where there are three time zone transitions every fourth year).
90 */
91 #define TZ_MAX_TIMES 370
92
93 #define TZ_MAX_TYPES 256 /* Limited by what (unsigned char)'s can hold */
94
95 #define TZ_MAX_CHARS 50 /* Maximum number of abbreviation characters */
96
97 #define TZ_MAX_LEAPS 50 /* Maximum number of leap second corrections */
98
99 #define SECSPERMIN 60
100 #define MINSPERHOUR 60
101 #define HOURSPERDAY 24
102 #define DAYSPERWEEK 7
103 #define DAYSPERNYEAR 365
104 #define DAYSPERLYEAR 366
105 #define SECSPERHOUR (SECSPERMIN * MINSPERHOUR)
106 #define SECSPERDAY ((long)SECSPERHOUR * HOURSPERDAY)
107 #define MONSPERYEAR 12
108
109 #define TM_SUNDAY 0
110 #define TM_MONDAY 1
111 #define TM_TUESDAY 2
112 #define TM_WEDNESDAY 3
113 #define TM_THURSDAY 4
114 #define TM_FRIDAY 5
115 #define TM_SATURDAY 6
116
117 #define TM_JANUARY 0
118 #define TM_FEBRUARY 1
119 #define TM_MARCH 2
120 #define TM_APRIL 3
121 #define TM_MAY 4
122 #define TM_JUNE 5
123 #define TM_JULY 6
124 #define TM_AUGUST 7
125 #define TM_SEPTEMBER 8
126 #define TM_OCTOBER 9
127 #define TM_NOVEMBER 10
128 #define TM_DECEMBER 11
129
130 #define TM_YEAR_BASE 1900
131
132 #define EPOCH_YEAR 1970
133 #define EPOCH_WDAY TM_THURSDAY
134
135 /*
136 * Accurate only for the past couple of centuries;
137 * that will probably do.
138 */
139
140 #define isleap(y) (((y) % 4) == 0 && ((y) % 100) != 0 || ((y) % 400) == 0)
141
142 /*
143 * Use of the underscored variants may cause problems if you move your code to
144 * certain System-V-based systems; for maximum portability, use the
145 * underscore-free variants. The underscored variants are provided for
146 * backward compatibility only; they may disappear from future versions of
147 * this file.
148 */
149
150 #define SECS_PER_MIN SECSPERMIN
151 #define MINS_PER_HOUR MINSPERHOUR
152 #define HOURS_PER_DAY HOURSPERDAY
153 #define DAYS_PER_WEEK DAYSPERWEEK
154 #define DAYS_PER_NYEAR DAYSPERNYEAR
155 #define DAYS_PER_LYEAR DAYSPERLYEAR
156 #define SECS_PER_HOUR SECSPERHOUR
157 #define SECS_PER_DAY SECSPERDAY
158 #define MONS_PER_YEAR MONSPERYEAR
159
160 #ifdef __cplusplus
161 }
162 #endif
163
164 #endif /* _SYS_TZFILE_H */