include/tzfile.h

   1 /*      $NetBSD: tzfile.h,v 1.7 2003/08/07 09:44:11 agc Exp $   */
   2
   3 /*
   4  * Copyright (c) 1988, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Arthur David Olson of the National Cancer Institute.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  *      @(#)tzfile.h    8.1 (Berkeley) 6/2/93
  35  */
  36
  37 #ifndef _TZFILE_H_
  38 #define _TZFILE_H_
  39
  40 /*
  41  * Information about time zone files.
  42  */
  43                         /* Time zone object file directory */
  44 #define TZDIR           "/usr/share/zoneinfo"
  45 #define TZDEFAULT       "/etc/localtime"
  46 #define TZDEFRULES      "posixrules"
  47
  48 /*
  49 ** Each file begins with. . .
  50 */
  51
  52 #define TZ_MAGIC        "TZif"
  53
  54 struct tzhead {
  55         char    tzh_magic[4];           /* TZ_MAGIC */
  56         char    tzh_reserved[16];       /* reserved for future use */
  57         char    tzh_ttisgmtcnt[4];      /* coded number of trans. time flags */
  58         char    tzh_ttisstdcnt[4];      /* coded number of trans. time flags */
  59         char    tzh_leapcnt[4];         /* coded number of leap seconds */
  60         char    tzh_timecnt[4];         /* coded number of transition times */
  61         char    tzh_typecnt[4];         /* coded number of local time types */
  62         char    tzh_charcnt[4];         /* coded number of abbr. chars */
  63 };
  64
  65 /*
  66 ** . . .followed by. . .
  67 **
  68 **      tzh_timecnt (char [4])s         coded transition times a la time(2)
  69 **      tzh_timecnt (unsigned char)s    types of local time starting at above
  70 **      tzh_typecnt repetitions of
  71 **              one (char [4])          coded UTC offset in seconds
  72 **              one (unsigned char)     used to set tm_isdst
  73 **              one (unsigned char)     that's an abbreviation list index
  74 **      tzh_charcnt (char)s             '\0'-terminated zone abbreviations
  75 **      tzh_leapcnt repetitions of
  76 **              one (char [4])          coded leap second transition times
  77 **              one (char [4])          total correction after above
  78 **      tzh_ttisstdcnt (char)s          indexed by type; if TRUE, transition
  79 **                                      time is standard time, if FALSE,
  80 **                                      transition time is wall clock time
  81 **                                      if absent, transition times are
  82 **                                      assumed to be wall clock time
  83 **      tzh_ttisgmtcnt (char)s          indexed by type; if TRUE, transition
  84 **                                      time is UTC, if FALSE,
  85 **                                      transition time is wall clock time
  86 **                                      if absent, transition times are
  87 **                                      assumed to be local time
  88 */
  89
  90 /*
  91 ** In the current implementation, "tzset()" refuses to deal with files that
  92 ** exceed any of the limits below.
  93 */
  94
  95 /*
  96 ** The TZ_MAX_TIMES value below is enough to handle a bit more than a
  97 ** year's worth of solar time (corrected daily to the nearest second) or
  98 ** 138 years of Pacific Presidential Election time
  99 ** (where there are three time zone transitions every fourth year).
 100 */
 101 #define TZ_MAX_TIMES    370
 102
 103 #define NOSOLAR                 /* 4BSD doesn't currently handle solar time */
 104
 105 #ifndef NOSOLAR
 106 #define TZ_MAX_TYPES    256     /* Limited by what (unsigned char)'s can hold */
 107 #else
 108 #define TZ_MAX_TYPES    10      /* Maximum number of local time types */
 109 #endif
 110
 111 #define TZ_MAX_CHARS    50      /* Maximum number of abbreviation characters */
 112
 113 #define TZ_MAX_LEAPS    50      /* Maximum number of leap second corrections */
 114
 115 #define SECSPERMIN      60
 116 #define MINSPERHOUR     60
 117 #define HOURSPERDAY     24
 118 #define DAYSPERWEEK     7
 119 #define DAYSPERNYEAR    365
 120 #define DAYSPERLYEAR    366
 121 #define SECSPERHOUR     (SECSPERMIN * MINSPERHOUR)
 122 #define SECSPERDAY      ((long) SECSPERHOUR * HOURSPERDAY)
 123 #define MONSPERYEAR     12
 124
 125 #define TM_SUNDAY       0
 126 #define TM_MONDAY       1
 127 #define TM_TUESDAY      2
 128 #define TM_WEDNESDAY    3
 129 #define TM_THURSDAY     4
 130 #define TM_FRIDAY       5
 131 #define TM_SATURDAY     6
 132
 133 #define TM_JANUARY      0
 134 #define TM_FEBRUARY     1
 135 #define TM_MARCH        2
 136 #define TM_APRIL        3
 137 #define TM_MAY          4
 138 #define TM_JUNE         5
 139 #define TM_JULY         6
 140 #define TM_AUGUST       7
 141 #define TM_SEPTEMBER    8
 142 #define TM_OCTOBER      9
 143 #define TM_NOVEMBER     10
 144 #define TM_DECEMBER     11
 145
 146 #define TM_YEAR_BASE    1900
 147
 148 #define EPOCH_YEAR      1970
 149 #define EPOCH_WDAY      TM_THURSDAY
 150
 151 /*
 152 ** Accurate only for the past couple of centuries;
 153 ** that will probably do.
 154 */
 155
 156 #define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0)
 157
 158 #endif /* !_TZFILE_H_ */