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 (arthur_david_olson@nih.gov). 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 /* 23 * @(#)tzfile.h 7.14 24 */ 25 /* 26 ** Information about time zone files. 27 */ 28 29 #ifndef TZDIR 30 #define TZDIR "/usr/share/zoneinfo" /* Time zone object file directory */ 31 #endif /* !defined TZDIR */ 32 33 #ifndef TZDEFAULT 34 #define TZDEFAULT "/etc/localtime" 35 #endif /* !defined TZDEFAULT */ 36 37 #ifndef TZDEFRULES 38 #define TZDEFRULES "posixrules" 39 #endif /* !defined TZDEFRULES */ 40 41 /* 42 ** Each file begins with. . . 43 */ 44 45 #define TZ_MAGIC "TZif" 46 47 struct tzhead { 48 char tzh_magic[4]; /* TZ_MAGIC */ 49 char tzh_reserved[16]; /* reserved for future use */ 50 char tzh_ttisgmtcnt[4]; /* coded number of trans. time flags */ 51 char tzh_ttisstdcnt[4]; /* coded number of trans. time flags */ 52 char tzh_leapcnt[4]; /* coded number of leap seconds */ 53 char tzh_timecnt[4]; /* coded number of transition times */ 54 char tzh_typecnt[4]; /* coded number of local time types */ 55 char tzh_charcnt[4]; /* coded number of abbr. chars */ 56 }; 57 58 /* 59 ** . . .followed by. . . 60 ** 61 ** tzh_timecnt (char [4])s coded transition times a la time(2) 62 ** tzh_timecnt (unsigned char)s types of local time starting at above 63 ** tzh_typecnt repetitions of 64 ** one (char [4]) coded UTC offset in seconds 65 ** one (unsigned char) used to set tm_isdst 66 ** one (unsigned char) that's an abbreviation list index 67 ** tzh_charcnt (char)s '\0'-terminated zone abbreviations 68 ** tzh_leapcnt repetitions of 69 ** one (char [4]) coded leap second transition times 70 ** one (char [4]) total correction after above 71 ** tzh_ttisstdcnt (char)s indexed by type; if TRUE, transition 72 ** time is standard time, if FALSE, 73 ** transition time is wall clock time 74 ** if absent, transition times are 75 ** assumed to be wall clock time 76 ** tzh_ttisgmtcnt (char)s indexed by type; if TRUE, transition 77 ** time is UTC, if FALSE, 78 ** transition time is local time 79 ** if absent, transition times are 80 ** assumed to be local 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 #ifndef TZ_MAX_TIMES 89 /* 90 ** The TZ_MAX_TIMES value below is enough to handle a bit more than a 91 ** year's worth of solar time (corrected daily to the nearest second) or 92 ** 138 years of Pacific Presidential Election time 93 ** (where there are three time zone transitions every fourth year). 94 */ 95 #define TZ_MAX_TIMES 370 96 #endif /* !defined TZ_MAX_TIMES */ 97 98 #ifndef TZ_MAX_TYPES 99 #ifndef NOSOLAR 100 #define TZ_MAX_TYPES 256 /* Limited by what (unsigned char)'s can hold */ 101 #endif /* !defined NOSOLAR */ 102 #ifdef NOSOLAR 103 /* 104 ** Must be at least 14 for Europe/Riga as of Jan 12 1995, 105 ** as noted by Earl Chew <earl@hpato.aus.hp.com>. 106 */ 107 #define TZ_MAX_TYPES 20 /* Maximum number of local time types */ 108 #endif /* !defined NOSOLAR */ 109 #endif /* !defined TZ_MAX_TYPES */ 110 111 #ifndef TZ_MAX_CHARS 112 #define TZ_MAX_CHARS 50 /* Maximum number of abbreviation characters */ 113 /* (limited by what unsigned chars can hold) */ 114 #endif /* !defined TZ_MAX_CHARS */ 115 116 #ifndef TZ_MAX_LEAPS 117 #define TZ_MAX_LEAPS 50 /* Maximum number of leap second corrections */ 118 #endif /* !defined TZ_MAX_LEAPS */ 119 120 #define SECSPERMIN 60 121 #define MINSPERHOUR 60 122 #define HOURSPERDAY 24 123 #define DAYSPERWEEK 7 124 #define DAYSPERNYEAR 365 125 #define DAYSPERLYEAR 366 126 #define SECSPERHOUR (SECSPERMIN * MINSPERHOUR) 127 #define SECSPERDAY ((long) SECSPERHOUR * HOURSPERDAY) 128 #define MONSPERYEAR 12 129 130 #define TM_SUNDAY 0 131 #define TM_MONDAY 1 132 #define TM_TUESDAY 2 133 #define TM_WEDNESDAY 3 134 #define TM_THURSDAY 4 135 #define TM_FRIDAY 5 136 #define TM_SATURDAY 6 137 138 #define TM_JANUARY 0 139 #define TM_FEBRUARY 1 140 #define TM_MARCH 2 141 #define TM_APRIL 3 142 #define TM_MAY 4 143 #define TM_JUNE 5 144 #define TM_JULY 6 145 #define TM_AUGUST 7 146 #define TM_SEPTEMBER 8 147 #define TM_OCTOBER 9 148 #define TM_NOVEMBER 10 149 #define TM_DECEMBER 11 150 151 #define TM_YEAR_BASE 1900 152 153 #define EPOCH_YEAR 1970 154 #define EPOCH_WDAY TM_THURSDAY 155 156 /* 157 ** Accurate only for the past couple of centuries; 158 ** that will probably do. 159 */ 160 161 #define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0)) 162 163 #ifndef USG 164 165 /* 166 ** Use of the underscored variants may cause problems if you move your code to 167 ** certain System-V-based systems; for maximum portability, use the 168 ** underscore-free variants. The underscored variants are provided for 169 ** backward compatibility only; they may disappear from future versions of 170 ** this file. 171 */ 172 173 #define SECS_PER_MIN SECSPERMIN 174 #define MINS_PER_HOUR MINSPERHOUR 175 #define HOURS_PER_DAY HOURSPERDAY 176 #define DAYS_PER_WEEK DAYSPERWEEK 177 #define DAYS_PER_NYEAR DAYSPERNYEAR 178 #define DAYS_PER_LYEAR DAYSPERLYEAR 179 #define SECS_PER_HOUR SECSPERHOUR 180 #define SECS_PER_DAY SECSPERDAY 181 #define MONS_PER_YEAR MONSPERYEAR 182 183 #endif /* !defined USG */ 184 185 #endif /* !defined TZFILE_H */ 186