1 #ifndef TZFILE_INCLUDED 2 #define TZFILE_INCLUDED 3 4 /* Copyright (c) 2004, 2021, Oracle and/or its affiliates. 5 6 This program is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License, version 2.0, 8 as published by the Free Software Foundation. 9 10 This program is also distributed with certain software (including 11 but not limited to OpenSSL) that is licensed under separate terms, 12 as designated in a particular file or component or in included license 13 documentation. The authors of MySQL hereby grant you an additional 14 permission to link the program and your derivative works with the 15 separately licensed software that they have included with MySQL. 16 17 This program is distributed in the hope that it will be useful, 18 but WITHOUT ANY WARRANTY; without even the implied warranty of 19 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 GNU General Public License, version 2.0, for more details. 21 22 You should have received a copy of the GNU General Public License 23 along with this program; if not, write to the Free Software Foundation, 24 51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA */ 25 26 /* 27 This file is based on public domain code from ftp://elsie.ncih.nist.gov/ 28 Initial source code is in the public domain, so clarified as of 29 1996-06-05 by Arthur David Olson (arthur_david_olson@nih.gov). 30 */ 31 32 /* 33 Information about time zone files. 34 */ 35 36 #ifndef TZDIR 37 #define TZDIR "/usr/share/zoneinfo" /* Time zone object file directory */ 38 #endif /* !defined TZDIR */ 39 40 /* 41 Each file begins with. . . 42 */ 43 44 #define TZ_MAGIC "TZif" 45 46 struct tzhead { 47 uchar tzh_magic[4]; /* TZ_MAGIC */ 48 uchar tzh_reserved[16]; /* reserved for future use */ 49 uchar tzh_ttisgmtcnt[4]; /* coded number of trans. time flags */ 50 uchar tzh_ttisstdcnt[4]; /* coded number of trans. time flags */ 51 uchar tzh_leapcnt[4]; /* coded number of leap seconds */ 52 uchar tzh_timecnt[4]; /* coded number of transition times */ 53 uchar tzh_typecnt[4]; /* coded number of local time types */ 54 uchar tzh_charcnt[4]; /* coded number of abbr. chars */ 55 }; 56 57 /* 58 . . .followed by. . . 59 60 tzh_timecnt (char [4])s coded transition times a la time(2) 61 tzh_timecnt (unsigned char)s types of local time starting at above 62 tzh_typecnt repetitions of 63 one (char [4]) coded UTC offset in seconds 64 one (unsigned char) used to set tm_isdst 65 one (unsigned char) that's an abbreviation list index 66 tzh_charcnt (char)s '\0'-terminated zone abbreviations 67 tzh_leapcnt repetitions of 68 one (char [4]) coded leap second transition times 69 one (char [4]) total correction after above 70 tzh_ttisstdcnt (char)s indexed by type; if TRUE, transition 71 time is standard time, if FALSE, 72 transition time is wall clock time 73 if absent, transition times are 74 assumed to be wall clock time 75 tzh_ttisgmtcnt (char)s indexed by type; if TRUE, transition 76 time is UTC, if FALSE, 77 transition time is local time 78 if absent, transition times are 79 assumed to be local time 80 */ 81 82 /* 83 In the current implementation, we refuse to deal with files that 84 exceed any of the limits below. 85 */ 86 87 #ifndef TZ_MAX_TIMES 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 #endif /* !defined TZ_MAX_TIMES */ 96 97 #ifndef TZ_MAX_TYPES 98 /* 99 Must be at least 14 for Europe/Riga as of Jan 12 1995, 100 as noted by Earl Chew <earl@hpato.aus.hp.com>. 101 */ 102 #define TZ_MAX_TYPES 20 /* Maximum number of local time types */ 103 #endif /* !defined TZ_MAX_TYPES */ 104 105 #ifndef TZ_MAX_CHARS 106 #define TZ_MAX_CHARS 50 /* Maximum number of abbreviation characters */ 107 /* (limited by what unsigned chars can hold) */ 108 #endif /* !defined TZ_MAX_CHARS */ 109 110 #ifndef TZ_MAX_LEAPS 111 #define TZ_MAX_LEAPS 50 /* Maximum number of leap second corrections */ 112 #endif /* !defined TZ_MAX_LEAPS */ 113 114 #ifndef TZ_MAX_REV_RANGES 115 #define TZ_MAX_REV_RANGES (TZ_MAX_TIMES+TZ_MAX_LEAPS+2) 116 #endif 117 118 #define SECS_PER_MIN 60 119 #define MINS_PER_HOUR 60 120 #define HOURS_PER_DAY 24 121 #define DAYS_PER_WEEK 7 122 #define DAYS_PER_NYEAR 365 123 #define DAYS_PER_LYEAR 366 124 #define SECS_PER_HOUR (SECS_PER_MIN * MINS_PER_HOUR) 125 #define SECS_PER_DAY ((long) SECS_PER_HOUR * HOURS_PER_DAY) 126 #define MONS_PER_YEAR 12 127 128 #define TM_YEAR_BASE 1900 129 130 #define EPOCH_YEAR 1970 131 132 /* 133 Accurate only for the past couple of centuries, 134 that will probably do. 135 */ 136 137 #define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0)) 138 139 #endif 140