include/sys/tzfile.h

   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/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 */