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Annotation of src/include/tzfile.h, Revision 1.1.1.1

1.1       cgd         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_ */

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