include/tzfile.h

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