include/tzfile.h

   1 /*      $OpenBSD: tzfile.h,v 1.4 2003/06/02 19:34:12 millert Exp $      */
   2 /*      $NetBSD: tzfile.h,v 1.3 1994/10/26 00:56:37 cgd Exp $   */
   3
   4 /*
   5  * Copyright (c) 1988 Regents of the University of California.
   6  * All rights reserved.
   7  *
   8  * This code is derived from software contributed to Berkeley by
   9  * Arthur David Olson of the National Cancer Institute.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  *
  35  *      @(#)tzfile.h    5.10 (Berkeley) 4/3/91
  36  */
  37
  38 #ifndef _TZFILE_H_
  39 #define _TZFILE_H_
  40
  41 /*
  42  * Information about time zone files.
  43  */
  44                         /* Time zone object file directory */
  45 #define TZDIR           "/usr/share/zoneinfo"
  46 #define TZDEFAULT       "/etc/localtime"
  47 #define TZDEFRULES      "posixrules"
  48
  49 /*
  50 ** Each file begins with. . .
  51 */
  52
  53 struct tzhead {
  54         char    tzh_reserved[24];       /* reserved for future use */
  55         char    tzh_ttisstdcnt[4];      /* coded number of trans. time flags */
  56         char    tzh_leapcnt[4];         /* coded number of leap seconds */
  57         char    tzh_timecnt[4];         /* coded number of transition times */
  58         char    tzh_typecnt[4];         /* coded number of local time types */
  59         char    tzh_charcnt[4];         /* coded number of abbr. chars */
  60 };
  61
  62 /*
  63 ** . . .followed by. . .
  64 **
  65 **      tzh_timecnt (char [4])s         coded transition times a la time(2)
  66 **      tzh_timecnt (unsigned char)s    types of local time starting at above
  67 **      tzh_typecnt repetitions of
  68 **              one (char [4])          coded GMT offset in seconds
  69 **              one (unsigned char)     used to set tm_isdst
  70 **              one (unsigned char)     that's an abbreviation list index
  71 **      tzh_charcnt (char)s             '\0'-terminated zone abbreviations
  72 **      tzh_leapcnt repetitions of
  73 **              one (char [4])          coded leap second transition times
  74 **              one (char [4])          total correction after above
  75 **      tzh_ttisstdcnt (char)s          indexed by type; if TRUE, transition
  76 **                                      time is standard time, if FALSE,
  77 **                                      transition time is wall clock time
  78 **                                      if absent, transition times are
  79 **                                      assumed to be wall clock time
  80 */
  81
  82 /*
  83 ** In the current implementation, "tzset()" refuses to deal with files that
  84 ** exceed any of the limits below.
  85 */
  86
  87 /*
  88 ** The TZ_MAX_TIMES value below is enough to handle a bit more than a
  89 ** year's worth of solar time (corrected daily to the nearest second) or
  90 ** 138 years of Pacific Presidential Election time
  91 ** (where there are three time zone transitions every fourth year).
  92 */
  93 #define TZ_MAX_TIMES    370
  94
  95 #define NOSOLAR                 /* 4BSD doesn't currently handle solar time */
  96
  97 #ifndef NOSOLAR
  98 #define TZ_MAX_TYPES    256     /* Limited by what (unsigned char)'s can hold */
  99 #else
 100 #define TZ_MAX_TYPES    10      /* Maximum number of local time types */
 101 #endif
 102
 103 #define TZ_MAX_CHARS    50      /* Maximum number of abbreviation characters */
 104
 105 #define TZ_MAX_LEAPS    50      /* Maximum number of leap second corrections */
 106
 107 #define SECSPERMIN      60
 108 #define MINSPERHOUR     60
 109 #define HOURSPERDAY     24
 110 #define DAYSPERWEEK     7
 111 #define DAYSPERNYEAR    365
 112 #define DAYSPERLYEAR    366
 113 #define SECSPERHOUR     (SECSPERMIN * MINSPERHOUR)
 114 #define SECSPERDAY      ((long) SECSPERHOUR * HOURSPERDAY)
 115 #define MONSPERYEAR     12
 116
 117 #define TM_SUNDAY       0
 118 #define TM_MONDAY       1
 119 #define TM_TUESDAY      2
 120 #define TM_WEDNESDAY    3
 121 #define TM_THURSDAY     4
 122 #define TM_FRIDAY       5
 123 #define TM_SATURDAY     6
 124
 125 #define TM_JANUARY      0
 126 #define TM_FEBRUARY     1
 127 #define TM_MARCH        2
 128 #define TM_APRIL        3
 129 #define TM_MAY          4
 130 #define TM_JUNE         5
 131 #define TM_JULY         6
 132 #define TM_AUGUST       7
 133 #define TM_SEPTEMBER    8
 134 #define TM_OCTOBER      9
 135 #define TM_NOVEMBER     10
 136 #define TM_DECEMBER     11
 137
 138 #define TM_YEAR_BASE    1900
 139
 140 #define EPOCH_YEAR      1970
 141 #define EPOCH_WDAY      TM_THURSDAY
 142
 143 /*
 144 ** Accurate only for the past couple of centuries;
 145 ** that will probably do.
 146 */
 147
 148 #define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0)
 149
 150 #endif /* !_TZFILE_H_ */