include/tzfile.h

   1 /*      $NetBSD: tzfile.h,v 1.6 1998/07/30 14:11:22 kleink 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. All advertising materials mentioning features or use of this software
  19  *    must display the following acknowledgement:
  20  *      This product includes software developed by the University of
  21  *      California, Berkeley and its contributors.
  22  * 4. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  *
  38  *      @(#)tzfile.h    8.1 (Berkeley) 6/2/93
  39  */
  40
  41 #ifndef _TZFILE_H_
  42 #define _TZFILE_H_
  43
  44 /*
  45  * Information about time zone files.
  46  */
  47                         /* Time zone object file directory */
  48 #define TZDIR           "/usr/share/zoneinfo"
  49 #define TZDEFAULT       "/etc/localtime"
  50 #define TZDEFRULES      "posixrules"
  51
  52 /*
  53 ** Each file begins with. . .
  54 */
  55
  56 #define TZ_MAGIC        "TZif"
  57
  58 struct tzhead {
  59         char    tzh_magic[4];           /* TZ_MAGIC */
  60         char    tzh_reserved[16];       /* reserved for future use */
  61         char    tzh_ttisgmtcnt[4];      /* coded number of trans. time flags */
  62         char    tzh_ttisstdcnt[4];      /* coded number of trans. time flags */
  63         char    tzh_leapcnt[4];         /* coded number of leap seconds */
  64         char    tzh_timecnt[4];         /* coded number of transition times */
  65         char    tzh_typecnt[4];         /* coded number of local time types */
  66         char    tzh_charcnt[4];         /* coded number of abbr. chars */
  67 };
  68
  69 /*
  70 ** . . .followed by. . .
  71 **
  72 **      tzh_timecnt (char [4])s         coded transition times a la time(2)
  73 **      tzh_timecnt (unsigned char)s    types of local time starting at above
  74 **      tzh_typecnt repetitions of
  75 **              one (char [4])          coded UTC offset in seconds
  76 **              one (unsigned char)     used to set tm_isdst
  77 **              one (unsigned char)     that's an abbreviation list index
  78 **      tzh_charcnt (char)s             '\0'-terminated zone abbreviations
  79 **      tzh_leapcnt repetitions of
  80 **              one (char [4])          coded leap second transition times
  81 **              one (char [4])          total correction after above
  82 **      tzh_ttisstdcnt (char)s          indexed by type; if TRUE, transition
  83 **                                      time is standard time, if FALSE,
  84 **                                      transition time is wall clock time
  85 **                                      if absent, transition times are
  86 **                                      assumed to be wall clock time
  87 **      tzh_ttisgmtcnt (char)s          indexed by type; if TRUE, transition
  88 **                                      time is UTC, if FALSE,
  89 **                                      transition time is wall clock time
  90 **                                      if absent, transition times are
  91 **                                      assumed to be local time
  92 */
  93
  94 /*
  95 ** In the current implementation, "tzset()" refuses to deal with files that
  96 ** exceed any of the limits below.
  97 */
  98
  99 /*
 100 ** The TZ_MAX_TIMES value below is enough to handle a bit more than a
 101 ** year's worth of solar time (corrected daily to the nearest second) or
 102 ** 138 years of Pacific Presidential Election time
 103 ** (where there are three time zone transitions every fourth year).
 104 */
 105 #define TZ_MAX_TIMES    370
 106
 107 #define NOSOLAR                 /* 4BSD doesn't currently handle solar time */
 108
 109 #ifndef NOSOLAR
 110 #define TZ_MAX_TYPES    256     /* Limited by what (unsigned char)'s can hold */
 111 #else
 112 #define TZ_MAX_TYPES    10      /* Maximum number of local time types */
 113 #endif
 114
 115 #define TZ_MAX_CHARS    50      /* Maximum number of abbreviation characters */
 116
 117 #define TZ_MAX_LEAPS    50      /* Maximum number of leap second corrections */
 118
 119 #define SECSPERMIN      60
 120 #define MINSPERHOUR     60
 121 #define HOURSPERDAY     24
 122 #define DAYSPERWEEK     7
 123 #define DAYSPERNYEAR    365
 124 #define DAYSPERLYEAR    366
 125 #define SECSPERHOUR     (SECSPERMIN * MINSPERHOUR)
 126 #define SECSPERDAY      ((long) SECSPERHOUR * HOURSPERDAY)
 127 #define MONSPERYEAR     12
 128
 129 #define TM_SUNDAY       0
 130 #define TM_MONDAY       1
 131 #define TM_TUESDAY      2
 132 #define TM_WEDNESDAY    3
 133 #define TM_THURSDAY     4
 134 #define TM_FRIDAY       5
 135 #define TM_SATURDAY     6
 136
 137 #define TM_JANUARY      0
 138 #define TM_FEBRUARY     1
 139 #define TM_MARCH        2
 140 #define TM_APRIL        3
 141 #define TM_MAY          4
 142 #define TM_JUNE         5
 143 #define TM_JULY         6
 144 #define TM_AUGUST       7
 145 #define TM_SEPTEMBER    8
 146 #define TM_OCTOBER      9
 147 #define TM_NOVEMBER     10
 148 #define TM_DECEMBER     11
 149
 150 #define TM_YEAR_BASE    1900
 151
 152 #define EPOCH_YEAR      1970
 153 #define EPOCH_WDAY      TM_THURSDAY
 154
 155 /*
 156 ** Accurate only for the past couple of centuries;
 157 ** that will probably do.
 158 */
 159
 160 #define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0)
 161
 162 #endif /* !_TZFILE_H_ */