1 /** @file 2 Time Zone processing, declarations and macros. 3 4 Copyright (c) 2010 - 2011, Intel Corporation. All rights reserved.<BR> 5 This program and the accompanying materials are licensed and made available under 6 the terms and conditions of the BSD License that accompanies this distribution. 7 The full text of the license may be found at 8 http://opensource.org/licenses/bsd-license. 9 10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 12 13 Derived from the NIH time zone package file, tzfile.h, which contains the following notice: 14 15 This file is in the public domain, so clarified as of 16 1996-06-05 by Arthur David Olson (arthur_david_olson (at) nih.gov). 17 18 This header is for use ONLY with the time conversion code. 19 There is no guarantee that it will remain unchanged, 20 or that it will remain at all. 21 Do NOT copy it to any system include directory. 22 Thank you! 23 24 NetBSD: tzfile.h,v 1.8 1998/01/22 07:06:59 jtc Exp 25 **/ 26 #ifndef TZFILE_H 27 #define TZFILE_H 28 29 /* 30 ** Information about time zone files. 31 */ 32 33 #ifndef TZDIR /* Time zone object file directory */ 34 #define TZDIR "/usr/share/zoneinfo" 35 #endif /* !defined TZDIR */ 36 37 #ifndef TZDEFAULT 38 #define TZDEFAULT "/etc/localtime" 39 #endif /* !defined TZDEFAULT */ 40 41 #ifndef TZDEFRULES 42 #define TZDEFRULES "posixrules" 43 #endif /* !defined TZDEFRULES */ 44 45 /* 46 ** Each file begins with. . . 47 */ 48 49 #define TZ_MAGIC "TZif" 50 51 struct tzhead { 52 char tzh_magic[4]; /* TZ_MAGIC */ 53 char tzh_reserved[16]; /* reserved for future use */ 54 char tzh_ttisgmtcnt[4]; /* coded number of trans. time flags */ 55 char tzh_ttisstdcnt[4]; /* coded number of trans. time flags */ 56 char tzh_leapcnt[4]; /* coded number of leap seconds */ 57 char tzh_timecnt[4]; /* coded number of transition times */ 58 char tzh_typecnt[4]; /* coded number of local time types */ 59 char tzh_charcnt[4]; /* coded number of abbr. chars */ 60 }; 61 62 /* 63 ** . . .followed by. . . 64 ** 65 ** tzh_timecnt (char [4])s coded transition times a la time(2) 66 ** tzh_timecnt (unsigned char)s types of local time starting at above 67 ** tzh_typecnt repetitions of 68 ** one (char [4]) coded UTC offset in seconds 69 ** one (unsigned char) used to set tm_isdst 70 ** one (unsigned char) that's an abbreviation list index 71 ** tzh_charcnt (char)s '\0'-terminated zone abbreviations 72 ** tzh_leapcnt repetitions of 73 ** one (char [4]) coded leap second transition times 74 ** one (char [4]) total correction after above 75 ** tzh_ttisstdcnt (char)s indexed by type; if TRUE, transition 76 ** time is standard time, if FALSE, 77 ** transition time is wall clock time 78 ** if absent, transition times are 79 ** assumed to be wall clock time 80 ** tzh_ttisgmtcnt (char)s indexed by type; if TRUE, transition 81 ** time is UTC, if FALSE, 82 ** transition time is local time 83 ** if absent, transition times are 84 ** assumed to be local time 85 */ 86 87 /* 88 ** In the current implementation, "tzset()" refuses to deal with files that 89 ** exceed any of the limits below. 90 */ 91 92 #ifndef TZ_MAX_TIMES 93 /* 94 ** The TZ_MAX_TIMES value below is enough to handle a bit more than a 95 ** year's worth of solar time (corrected daily to the nearest second) or 96 ** 138 years of Pacific Presidential Election time 97 ** (where there are three time zone transitions every fourth year). 98 */ 99 #define TZ_MAX_TIMES 370 100 #endif /* !defined TZ_MAX_TIMES */ 101 102 #ifndef TZ_MAX_TYPES 103 #ifndef NOSOLAR 104 #define TZ_MAX_TYPES 256 /* Limited by what (unsigned char)'s can hold */ 105 #endif /* !defined NOSOLAR */ 106 #ifdef NOSOLAR 107 /* 108 ** Must be at least 14 for Europe/Riga as of Jan 12 1995, 109 ** as noted by Earl Chew <earl (at) hpato.aus.hp.com>. 110 */ 111 #define TZ_MAX_TYPES 20 /* Maximum number of local time types */ 112 #endif /* !defined NOSOLAR */ 113 #endif /* !defined TZ_MAX_TYPES */ 114 115 #ifndef TZ_MAX_CHARS 116 #define TZ_MAX_CHARS 50 /* Maximum number of abbreviation characters */ 117 /* (limited by what unsigned chars can hold) */ 118 #endif /* !defined TZ_MAX_CHARS */ 119 120 #ifndef TZ_MAX_LEAPS 121 #define TZ_MAX_LEAPS 50 /* Maximum number of leap second corrections */ 122 #endif /* !defined TZ_MAX_LEAPS */ 123 124 #define SECSPERMIN 60 125 #define MINSPERHOUR 60 126 #define HOURSPERDAY 24 127 #define DAYSPERWEEK 7 128 #define DAYSPERNYEAR 365 129 #define DAYSPERLYEAR 366 130 #define SECSPERHOUR (SECSPERMIN * MINSPERHOUR) 131 #define SECSPERDAY ((LONG32)(SECSPERHOUR * HOURSPERDAY)) 132 #define MONSPERYEAR 12 133 134 #define EPOCH_YEAR 1970 135 #define EPOCH_WDAY TM_THURSDAY // Use this for 32-bit time_t 136 //#define EPOCH_WDAY TM_SUNDAY // Use this for 64-bit time_t 137 138 /* 139 ** Accurate only for the past couple of centuries; 140 ** that will probably do. 141 */ 142 143 #define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0)) 144 145 #endif /* !defined TZFILE_H */ 146
