1 #ifndef TZFILE_H 2 3 #define TZFILE_H 4 5 /* 6 ** This file is in the public domain, so clarified as of 7 ** 1996-06-05 by Arthur David Olson. 8 */ 9 10 /* 11 ** This header is for use ONLY with the time conversion code. 12 ** There is no guarantee that it will remain unchanged, 13 ** or that it will remain at all. 14 ** Do NOT copy it to any system include directory. 15 ** Thank you! 16 */ 17 18 /* 19 ** ID 20 */ 21 22 #ifndef lint 23 #ifndef NOID 24 static char tzfilehid[] = "@(#)tzfile.h 8.1"; 25 #endif /* !defined NOID */ 26 #endif /* !defined lint */ 27 28 /* 29 ** Information about time zone files. 30 */ 31 32 #ifndef TZDIR 33 #define TZDIR "/usr/local/etc/zoneinfo" /* Time zone object file directory */ 34 #endif /* !defined TZDIR */ 35 36 #ifndef TZDEFAULT 37 #define TZDEFAULT "localtime" 38 #endif /* !defined TZDEFAULT */ 39 40 #ifndef TZDEFRULES 41 #define TZDEFRULES "posixrules" 42 #endif /* !defined TZDEFRULES */ 43 44 /* 45 ** Each file begins with. . . 46 */ 47 48 #define TZ_MAGIC "TZif" 49 50 struct tzhead { 51 char tzh_magic[4]; /* TZ_MAGIC */ 52 char tzh_version[1]; /* '\0' or '2' as of 2005 */ 53 char tzh_reserved[15]; /* reserved--must be zero */ 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 ** If tzh_version is '2' or greater, the above is followed by a second instance 89 ** of tzhead and a second instance of the data in which each coded transition 90 ** time uses 8 rather than 4 chars, 91 ** then a POSIX-TZ-environment-variable-style string for use in handling 92 ** instants after the last transition time stored in the file 93 ** (with nothing between the newlines if there is no POSIX representation for 94 ** such instants). 95 */ 96 97 /* 98 ** In the current implementation, "tzset()" refuses to deal with files that 99 ** exceed any of the limits below. 100 */ 101 102 #ifndef TZ_MAX_TIMES 103 #define TZ_MAX_TIMES 1200 104 #endif /* !defined TZ_MAX_TIMES */ 105 106 #ifndef TZ_MAX_TYPES 107 #ifndef NOSOLAR 108 #define TZ_MAX_TYPES 256 /* Limited by what (unsigned char)'s can hold */ 109 #endif /* !defined NOSOLAR */ 110 #ifdef NOSOLAR 111 /* 112 ** Must be at least 14 for Europe/Riga as of Jan 12 1995, 113 ** as noted by Earl Chew. 114 */ 115 #define TZ_MAX_TYPES 20 /* Maximum number of local time types */ 116 #endif /* !defined NOSOLAR */ 117 #endif /* !defined TZ_MAX_TYPES */ 118 119 #ifndef TZ_MAX_CHARS 120 #define TZ_MAX_CHARS 50 /* Maximum number of abbreviation characters */ 121 /* (limited by what unsigned chars can hold) */ 122 #endif /* !defined TZ_MAX_CHARS */ 123 124 #ifndef TZ_MAX_LEAPS 125 #define TZ_MAX_LEAPS 50 /* Maximum number of leap second corrections */ 126 #endif /* !defined TZ_MAX_LEAPS */ 127 128 #define SECSPERMIN 60 129 #define MINSPERHOUR 60 130 #define HOURSPERDAY 24 131 #define DAYSPERWEEK 7 132 #define DAYSPERNYEAR 365 133 #define DAYSPERLYEAR 366 134 #define SECSPERHOUR (SECSPERMIN * MINSPERHOUR) 135 #define SECSPERDAY ((long) SECSPERHOUR * HOURSPERDAY) 136 #define MONSPERYEAR 12 137 138 #define TM_SUNDAY 0 139 #define TM_MONDAY 1 140 #define TM_TUESDAY 2 141 #define TM_WEDNESDAY 3 142 #define TM_THURSDAY 4 143 #define TM_FRIDAY 5 144 #define TM_SATURDAY 6 145 146 #define TM_JANUARY 0 147 #define TM_FEBRUARY 1 148 #define TM_MARCH 2 149 #define TM_APRIL 3 150 #define TM_MAY 4 151 #define TM_JUNE 5 152 #define TM_JULY 6 153 #define TM_AUGUST 7 154 #define TM_SEPTEMBER 8 155 #define TM_OCTOBER 9 156 #define TM_NOVEMBER 10 157 #define TM_DECEMBER 11 158 159 #define TM_YEAR_BASE 1900 160 161 #define EPOCH_YEAR 1970 162 #define EPOCH_WDAY TM_THURSDAY 163 164 #define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0)) 165 166 /* 167 ** Since everything in isleap is modulo 400 (or a factor of 400), we know that 168 ** isleap(y) == isleap(y % 400) 169 ** and so 170 ** isleap(a + b) == isleap((a + b) % 400) 171 ** or 172 ** isleap(a + b) == isleap(a % 400 + b % 400) 173 ** This is true even if % means modulo rather than Fortran remainder 174 ** (which is allowed by C89 but not C99). 175 ** We use this to avoid addition overflow problems. 176 */ 177 178 #define isleap_sum(a, b) isleap((a) % 400 + (b) % 400) 179 180 #endif /* !defined TZFILE_H */ 181
