include/tzfile.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * Copyright (c) 1988, 1993
  27  *      The Regents of the University of California.  All rights reserved.
  28  *
  29  * This code is derived from software contributed to Berkeley by
  30  * Arthur David Olson of the National Cancer Institute.
  31  *
  32  * Redistribution and use in source and binary forms, with or without
  33  * modification, are permitted provided that the following conditions
  34  * are met:
  35  * 1. Redistributions of source code must retain the above copyright
  36  *    notice, this list of conditions and the following disclaimer.
  37  * 2. Redistributions in binary form must reproduce the above copyright
  38  *    notice, this list of conditions and the following disclaimer in the
  39  *    documentation and/or other materials provided with the distribution.
  40  * 3. All advertising materials mentioning features or use of this software
  41  *    must display the following acknowledgement:
  42  *      This product includes software developed by the University of
  43  *      California, Berkeley and its contributors.
  44  * 4. Neither the name of the University nor the names of its contributors
  45  *    may be used to endorse or promote products derived from this software
  46  *    without specific prior written permission.
  47  *
  48  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  49  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  50  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  51  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  52  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  53  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  54  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  57  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  58  * SUCH DAMAGE.
  59  *
  60  *      @(#)tzfile.h    8.1 (Berkeley) 6/2/93
  61  */
  62
  63 #ifndef _TZFILE_H_
  64 #define _TZFILE_H_
  65
  66 /*
  67  * Information about time zone files.
  68  */
  69                         /* Time zone object file directory */
  70 #define TZDIR           "/usr/share/zoneinfo"
  71 #define TZDEFAULT       "/etc/localtime"
  72 #define TZDEFRULES      "posixrules"
  73
  74 /*
  75 ** Each file begins with. . .
  76 */
  77
  78 struct tzhead {
  79         char    tzh_reserved[24];       /* reserved for future use */
  80         char    tzh_ttisstdcnt[4];      /* coded number of trans. time flags */
  81         char    tzh_leapcnt[4];         /* coded number of leap seconds */
  82         char    tzh_timecnt[4];         /* coded number of transition times */
  83         char    tzh_typecnt[4];         /* coded number of local time types */
  84         char    tzh_charcnt[4];         /* coded number of abbr. chars */
  85 };
  86
  87 /*
  88 ** . . .followed by. . .
  89 **
  90 **      tzh_timecnt (char [4])s         coded transition times a la time(2)
  91 **      tzh_timecnt (unsigned char)s    types of local time starting at above
  92 **      tzh_typecnt repetitions of
  93 **              one (char [4])          coded GMT offset in seconds
  94 **              one (unsigned char)     used to set tm_isdst
  95 **              one (unsigned char)     that's an abbreviation list index
  96 **      tzh_charcnt (char)s             '\0'-terminated zone abbreviations
  97 **      tzh_leapcnt repetitions of
  98 **              one (char [4])          coded leap second transition times
  99 **              one (char [4])          total correction after above
 100 **      tzh_ttisstdcnt (char)s          indexed by type; if TRUE, transition
 101 **                                      time is standard time, if FALSE,
 102 **                                      transition time is wall clock time
 103 **                                      if absent, transition times are
 104 **                                      assumed to be wall clock time
 105 */
 106
 107 /*
 108 ** In the current implementation, "tzset()" refuses to deal with files that
 109 ** exceed any of the limits below.
 110 */
 111
 112 /*
 113 ** The TZ_MAX_TIMES value below is enough to handle a bit more than a
 114 ** year's worth of solar time (corrected daily to the nearest second) or
 115 ** 138 years of Pacific Presidential Election time
 116 ** (where there are three time zone transitions every fourth year).
 117 */
 118 #define TZ_MAX_TIMES    370
 119
 120 #define NOSOLAR                 /* 4BSD doesn't currently handle solar time */
 121
 122 #ifndef NOSOLAR
 123 #define TZ_MAX_TYPES    256     /* Limited by what (unsigned char)'s can hold */
 124 #else
 125 #define TZ_MAX_TYPES    20      /* Maximum number of local time types */
 126 #endif
 127
 128 #define TZ_MAX_CHARS    50      /* Maximum number of abbreviation characters */
 129
 130 #define TZ_MAX_LEAPS    50      /* Maximum number of leap second corrections */
 131
 132 #define SECSPERMIN      60
 133 #define MINSPERHOUR     60
 134 #define HOURSPERDAY     24
 135 #define DAYSPERWEEK     7
 136 #define DAYSPERNYEAR    365
 137 #define DAYSPERLYEAR    366
 138 #define SECSPERHOUR     (SECSPERMIN * MINSPERHOUR)
 139 #define SECSPERDAY      ((long) SECSPERHOUR * HOURSPERDAY)
 140 #define MONSPERYEAR     12
 141
 142 #define TM_SUNDAY       0
 143 #define TM_MONDAY       1
 144 #define TM_TUESDAY      2
 145 #define TM_WEDNESDAY    3
 146 #define TM_THURSDAY     4
 147 #define TM_FRIDAY       5
 148 #define TM_SATURDAY     6
 149
 150 #define TM_JANUARY      0
 151 #define TM_FEBRUARY     1
 152 #define TM_MARCH        2
 153 #define TM_APRIL        3
 154 #define TM_MAY          4
 155 #define TM_JUNE         5
 156 #define TM_JULY         6
 157 #define TM_AUGUST       7
 158 #define TM_SEPTEMBER    8
 159 #define TM_OCTOBER      9
 160 #define TM_NOVEMBER     10
 161 #define TM_DECEMBER     11
 162
 163 #define TM_YEAR_BASE    1900
 164
 165 #define EPOCH_YEAR      1970
 166 #define EPOCH_WDAY      TM_THURSDAY
 167
 168 /*
 169 ** Accurate only for the past couple of centuries;
 170 ** that will probably do.
 171 */
 172
 173 #define isleap(y) (((y) % 4) == 0 && ((y) % 100) != 0 || ((y) % 400) == 0)
 174
 175 #endif /* !_TZFILE_H_ */