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Annotation of src/include/tzfile.h, Revision 1.7

1.7     ! agc         1: /*     $NetBSD: tzfile.h,v 1.6 1998/07/30 14:11:22 kleink Exp $        */
1.3       cgd         2:
1.1       cgd         3: /*
1.5       perry       4:  * Copyright (c) 1988, 1993
                      5:  *     The Regents of the University of California.  All rights reserved.
1.1       cgd         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.
1.7     ! agc        18:  * 3. Neither the name of the University nor the names of its contributors
1.1       cgd        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:  *
1.5       perry      34:  *     @(#)tzfile.h    8.1 (Berkeley) 6/2/93
1.1       cgd        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:
1.6       kleink     52: #define TZ_MAGIC       "TZif"
                     53:
1.1       cgd        54: struct tzhead {
1.6       kleink     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 */
1.1       cgd        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
1.6       kleink     71: **             one (char [4])          coded UTC offset in seconds
1.1       cgd        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
1.6       kleink     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
1.1       cgd        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:
1.4       mikel     156: #define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0)
1.1       cgd       157:
                    158: #endif /* !_TZFILE_H_ */