1 #ifndef TZFILE_INCLUDED 2 #define TZFILE_INCLUDED 3 4 /* Copyright (c) 2004, 2006, 2007 MySQL AB, 2009 Sun Microsystems, Inc. 5 Use is subject to license terms. 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; version 2 of the License. 10 11 This program is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with this program; if not, write to the Free Software 18 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ 19 20 /* 21 This file is based on public domain code from ftp://elsie.ncih.nist.gov/ 22 Initial source code is in the public domain, so clarified as of 23 1996-06-05 by Arthur David Olson (arthur_david_olson@nih.gov). 24 */ 25 26 /* 27 Information about time zone files. 28 */ 29 30 #ifndef TZDIR 31 #define TZDIR "/usr/share/zoneinfo" /* Time zone object file directory */ 32 #endif /* !defined TZDIR */ 33 34 /* 35 Each file begins with. . . 36 */ 37 38 #define TZ_MAGIC "TZif" 39 40 struct tzhead { 41 uchar tzh_magic[4]; /* TZ_MAGIC */ 42 uchar tzh_reserved[16]; /* reserved for future use */ 43 uchar tzh_ttisgmtcnt[4]; /* coded number of trans. time flags */ 44 uchar tzh_ttisstdcnt[4]; /* coded number of trans. time flags */ 45 uchar tzh_leapcnt[4]; /* coded number of leap seconds */ 46 uchar tzh_timecnt[4]; /* coded number of transition times */ 47 uchar tzh_typecnt[4]; /* coded number of local time types */ 48 uchar tzh_charcnt[4]; /* coded number of abbr. chars */ 49 }; 50 51 /* 52 . . .followed by. . . 53 54 tzh_timecnt (char [4])s coded transition times a la time(2) 55 tzh_timecnt (unsigned char)s types of local time starting at above 56 tzh_typecnt repetitions of 57 one (char [4]) coded UTC offset in seconds 58 one (unsigned char) used to set tm_isdst 59 one (unsigned char) that's an abbreviation list index 60 tzh_charcnt (char)s '\0'-terminated zone abbreviations 61 tzh_leapcnt repetitions of 62 one (char [4]) coded leap second transition times 63 one (char [4]) total correction after above 64 tzh_ttisstdcnt (char)s indexed by type; if TRUE, transition 65 time is standard time, if FALSE, 66 transition time is wall clock time 67 if absent, transition times are 68 assumed to be wall clock time 69 tzh_ttisgmtcnt (char)s indexed by type; if TRUE, transition 70 time is UTC, if FALSE, 71 transition time is local time 72 if absent, transition times are 73 assumed to be local time 74 */ 75 76 /* 77 In the current implementation, we refuse to deal with files that 78 exceed any of the limits below. 79 */ 80 81 #ifndef TZ_MAX_TIMES 82 /* 83 The TZ_MAX_TIMES value below is enough to handle a bit more than a 84 year's worth of solar time (corrected daily to the nearest second) or 85 138 years of Pacific Presidential Election time 86 (where there are three time zone transitions every fourth year). 87 */ 88 #define TZ_MAX_TIMES 370 89 #endif /* !defined TZ_MAX_TIMES */ 90 91 #ifndef TZ_MAX_TYPES 92 #ifdef SOLAR 93 #define TZ_MAX_TYPES 256 /* Limited by what (unsigned char)'s can hold */ 94 #else 95 /* 96 Must be at least 14 for Europe/Riga as of Jan 12 1995, 97 as noted by Earl Chew <earl@hpato.aus.hp.com>. 98 */ 99 #define TZ_MAX_TYPES 20 /* Maximum number of local time types */ 100 #endif /* defined SOLAR */ 101 #endif /* !defined TZ_MAX_TYPES */ 102 103 #ifndef TZ_MAX_CHARS 104 #define TZ_MAX_CHARS 50 /* Maximum number of abbreviation characters */ 105 /* (limited by what unsigned chars can hold) */ 106 #endif /* !defined TZ_MAX_CHARS */ 107 108 #ifndef TZ_MAX_LEAPS 109 #define TZ_MAX_LEAPS 50 /* Maximum number of leap second corrections */ 110 #endif /* !defined TZ_MAX_LEAPS */ 111 112 #ifndef TZ_MAX_REV_RANGES 113 #ifdef SOLAR 114 /* Solar (Asia/RiyadhXX) zones need significantly bigger TZ_MAX_REV_RANGES */ 115 #define TZ_MAX_REV_RANGES (TZ_MAX_TIMES*2+TZ_MAX_LEAPS*2+2) 116 #else 117 #define TZ_MAX_REV_RANGES (TZ_MAX_TIMES+TZ_MAX_LEAPS+2) 118 #endif 119 #endif 120 121 #define SECS_PER_MIN 60 122 #define MINS_PER_HOUR 60 123 #define HOURS_PER_DAY 24 124 #define DAYS_PER_WEEK 7 125 #define DAYS_PER_NYEAR 365 126 #define DAYS_PER_LYEAR 366 127 #define SECS_PER_HOUR (SECS_PER_MIN * MINS_PER_HOUR) 128 #define SECS_PER_DAY ((long) SECS_PER_HOUR * HOURS_PER_DAY) 129 #define MONS_PER_YEAR 12 130 131 #define TM_YEAR_BASE 1900 132 133 #define EPOCH_YEAR 1970 134 135 /* 136 Accurate only for the past couple of centuries, 137 that will probably do. 138 */ 139 140 #define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0)) 141 142 #endif 143