bsd/include/tzfile.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * Copyright (c) 1988, 1993
  24  *      The Regents of the University of California.  All rights reserved.
  25  *
  26  * This code is derived from software contributed to Berkeley by
  27  * Arthur David Olson of the National Cancer Institute.
  28  *
  29  * Redistribution and use in source and binary forms, with or without
  30  * modification, are permitted provided that the following conditions
  31  * are met:
  32  * 1. Redistributions of source code must retain the above copyright
  33  *    notice, this list of conditions and the following disclaimer.
  34  * 2. Redistributions in binary form must reproduce the above copyright
  35  *    notice, this list of conditions and the following disclaimer in the
  36  *    documentation and/or other materials provided with the distribution.
  37  * 3. All advertising materials mentioning features or use of this software
  38  *    must display the following acknowledgement:
  39  *      This product includes software developed by the University of
  40  *      California, Berkeley and its contributors.
  41  * 4. Neither the name of the University nor the names of its contributors
  42  *    may be used to endorse or promote products derived from this software
  43  *    without specific prior written permission.
  44  *
  45  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  46  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  47  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  48  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  49  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  50  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  51  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  52  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  53  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  54  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  55  * SUCH DAMAGE.
  56  *
  57  *      @(#)tzfile.h    8.1 (Berkeley) 6/2/93
  58  */
  59
  60 #ifndef _TZFILE_H_
  61 #define _TZFILE_H_
  62
  63 /*
  64  * Information about time zone files.
  65  */
  66                         /* Time zone object file directory */
  67 #define TZDIR           "/usr/share/zoneinfo"
  68 #define TZDEFAULT       "/etc/localtime"
  69 #define TZDEFRULES      "posixrules"
  70
  71 /*
  72 ** Each file begins with. . .
  73 */
  74
  75 struct tzhead {
  76         char    tzh_reserved[24];       /* reserved for future use */
  77         char    tzh_ttisstdcnt[4];      /* coded number of trans. time flags */
  78         char    tzh_leapcnt[4];         /* coded number of leap seconds */
  79         char    tzh_timecnt[4];         /* coded number of transition times */
  80         char    tzh_typecnt[4];         /* coded number of local time types */
  81         char    tzh_charcnt[4];         /* coded number of abbr. chars */
  82 };
  83
  84 /*
  85 ** . . .followed by. . .
  86 **
  87 **      tzh_timecnt (char [4])s         coded transition times a la time(2)
  88 **      tzh_timecnt (unsigned char)s    types of local time starting at above
  89 **      tzh_typecnt repetitions of
  90 **              one (char [4])          coded GMT offset in seconds
  91 **              one (unsigned char)     used to set tm_isdst
  92 **              one (unsigned char)     that's an abbreviation list index
  93 **      tzh_charcnt (char)s             '\0'-terminated zone abbreviations
  94 **      tzh_leapcnt repetitions of
  95 **              one (char [4])          coded leap second transition times
  96 **              one (char [4])          total correction after above
  97 **      tzh_ttisstdcnt (char)s          indexed by type; if TRUE, transition
  98 **                                      time is standard time, if FALSE,
  99 **                                      transition time is wall clock time
 100 **                                      if absent, transition times are
 101 **                                      assumed to be wall clock time
 102 */
 103
 104 /*
 105 ** In the current implementation, "tzset()" refuses to deal with files that
 106 ** exceed any of the limits below.
 107 */
 108
 109 /*
 110 ** The TZ_MAX_TIMES value below is enough to handle a bit more than a
 111 ** year's worth of solar time (corrected daily to the nearest second) or
 112 ** 138 years of Pacific Presidential Election time
 113 ** (where there are three time zone transitions every fourth year).
 114 */
 115 #define TZ_MAX_TIMES    370
 116
 117 #define NOSOLAR                 /* 4BSD doesn't currently handle solar time */
 118
 119 #ifndef NOSOLAR
 120 #define TZ_MAX_TYPES    256     /* Limited by what (unsigned char)'s can hold */
 121 #else
 122 #define TZ_MAX_TYPES    20      /* Maximum number of local time types */
 123 #endif
 124
 125 #define TZ_MAX_CHARS    50      /* Maximum number of abbreviation characters */
 126
 127 #define TZ_MAX_LEAPS    50      /* Maximum number of leap second corrections */
 128
 129 #define SECSPERMIN      60
 130 #define MINSPERHOUR     60
 131 #define HOURSPERDAY     24
 132 #define DAYSPERWEEK     7
 133 #define DAYSPERNYEAR    365
 134 #define DAYSPERLYEAR    366
 135 #define SECSPERHOUR     (SECSPERMIN * MINSPERHOUR)
 136 #define SECSPERDAY      ((long) SECSPERHOUR * HOURSPERDAY)
 137 #define MONSPERYEAR     12
 138
 139 #define TM_SUNDAY       0
 140 #define TM_MONDAY       1
 141 #define TM_TUESDAY      2
 142 #define TM_WEDNESDAY    3
 143 #define TM_THURSDAY     4
 144 #define TM_FRIDAY       5
 145 #define TM_SATURDAY     6
 146
 147 #define TM_JANUARY      0
 148 #define TM_FEBRUARY     1
 149 #define TM_MARCH        2
 150 #define TM_APRIL        3
 151 #define TM_MAY          4
 152 #define TM_JUNE         5
 153 #define TM_JULY         6
 154 #define TM_AUGUST       7
 155 #define TM_SEPTEMBER    8
 156 #define TM_OCTOBER      9
 157 #define TM_NOVEMBER     10
 158 #define TM_DECEMBER     11
 159
 160 #define TM_YEAR_BASE    1900
 161
 162 #define EPOCH_YEAR      1970
 163 #define EPOCH_WDAY      TM_THURSDAY
 164
 165 /*
 166 ** Accurate only for the past couple of centuries;
 167 ** that will probably do.
 168 */
 169
 170 #define isleap(y) (((y) % 4) == 0 && ((y) % 100) != 0 || ((y) % 400) == 0)
 171
 172 #endif /* !_TZFILE_H_ */