00001 #ifndef TZFILE_H 00002 00003 #define TZFILE_H 00004 00005 /* 00006 ** This file is in the public domain, so clarified as of 00007 ** 1996-06-05 by Arthur David Olson. 00008 */ 00009 00010 /* 00011 ** This header is for use ONLY with the time conversion code. 00012 ** There is no guarantee that it will remain unchanged, 00013 ** or that it will remain at all. 00014 ** Do NOT copy it to any system include directory. 00015 ** Thank you! 00016 */ 00017 00018 /* 00019 ** ID 00020 */ 00021 00022 #ifndef lint 00023 #ifndef NOID 00024 static char __attribute__((unused)) tzfilehid[] = "@(#)tzfile.h 8.1"; 00025 #endif /* !defined NOID */ 00026 #endif /* !defined lint */ 00027 00028 /* 00029 ** Information about time zone files. 00030 */ 00031 00032 #ifndef TZDIR 00033 #ifdef SOLARIS 00034 #define TZDIR "/usr/share/lib/zoneinfo" 00035 #else 00036 #define TZDIR "/usr/share/zoneinfo" 00037 #endif /* defined SOLARIS */ 00038 #endif /* !defined TZDIR */ 00039 00040 #ifndef TZDEFAULT 00041 #define TZDEFAULT "localtime" 00042 #endif /* !defined TZDEFAULT */ 00043 00044 #ifndef TZDEFRULES 00045 #define TZDEFRULES "posixrules" 00046 #endif /* !defined TZDEFRULES */ 00047 00048 /* 00049 ** Each file begins with. . . 00050 */ 00051 00052 #define TZ_MAGIC "TZif" 00053 00054 struct tzhead { 00055 char tzh_magic[4]; /* TZ_MAGIC */ 00056 char tzh_version[1]; /* '\0' or '2' as of 2005 */ 00057 char tzh_reserved[15]; /* reserved--must be zero */ 00058 char tzh_ttisgmtcnt[4]; /* coded number of trans. time flags */ 00059 char tzh_ttisstdcnt[4]; /* coded number of trans. time flags */ 00060 char tzh_leapcnt[4]; /* coded number of leap seconds */ 00061 char tzh_timecnt[4]; /* coded number of transition times */ 00062 char tzh_typecnt[4]; /* coded number of local time types */ 00063 char tzh_charcnt[4]; /* coded number of abbr. chars */ 00064 }; 00065 00066 /* 00067 ** . . .followed by. . . 00068 ** 00069 ** tzh_timecnt (char [4])s coded transition times a la time(2) 00070 ** tzh_timecnt (unsigned char)s types of local time starting at above 00071 ** tzh_typecnt repetitions of 00072 ** one (char [4]) coded UTC offset in seconds 00073 ** one (unsigned char) used to set tm_isdst 00074 ** one (unsigned char) that's an abbreviation list index 00075 ** tzh_charcnt (char)s '\0'-terminated zone abbreviations 00076 ** tzh_leapcnt repetitions of 00077 ** one (char [4]) coded leap second transition times 00078 ** one (char [4]) total correction after above 00079 ** tzh_ttisstdcnt (char)s indexed by type; if TRUE, transition 00080 ** time is standard time, if FALSE, 00081 ** transition time is wall clock time 00082 ** if absent, transition times are 00083 ** assumed to be wall clock time 00084 ** tzh_ttisgmtcnt (char)s indexed by type; if TRUE, transition 00085 ** time is UTC, if FALSE, 00086 ** transition time is local time 00087 ** if absent, transition times are 00088 ** assumed to be local time 00089 */ 00090 00091 /* 00092 ** If tzh_version is '2' or greater, the above is followed by a second instance 00093 ** of tzhead and a second instance of the data in which each coded transition 00094 ** time uses 8 rather than 4 chars, 00095 ** then a POSIX-TZ-environment-variable-style string for use in handling 00096 ** instants after the last transition time stored in the file 00097 ** (with nothing between the newlines if there is no POSIX representation for 00098 ** such instants). 00099 */ 00100 00101 /* 00102 ** In the current implementation, "tzset()" refuses to deal with files that 00103 ** exceed any of the limits below. 00104 */ 00105 00106 #ifndef TZ_MAX_TIMES 00107 #define TZ_MAX_TIMES 1200 00108 #endif /* !defined TZ_MAX_TIMES */ 00109 00110 #ifndef TZ_MAX_TYPES 00111 #ifndef NOSOLAR 00112 #define TZ_MAX_TYPES 256 /* Limited by what (unsigned char)'s can hold */ 00113 #endif /* !defined NOSOLAR */ 00114 #ifdef NOSOLAR 00115 /* 00116 ** Must be at least 14 for Europe/Riga as of Jan 12 1995, 00117 ** as noted by Earl Chew. 00118 */ 00119 #define TZ_MAX_TYPES 20 /* Maximum number of local time types */ 00120 #endif /* !defined NOSOLAR */ 00121 #endif /* !defined TZ_MAX_TYPES */ 00122 00123 #ifndef TZ_MAX_CHARS 00124 #define TZ_MAX_CHARS 50 /* Maximum number of abbreviation characters */ 00125 /* (limited by what unsigned chars can hold) */ 00126 #endif /* !defined TZ_MAX_CHARS */ 00127 00128 #ifndef TZ_MAX_LEAPS 00129 #define TZ_MAX_LEAPS 50 /* Maximum number of leap second corrections */ 00130 #endif /* !defined TZ_MAX_LEAPS */ 00131 00132 #define SECSPERMIN 60 00133 #define MINSPERHOUR 60 00134 #define HOURSPERDAY 24 00135 #define DAYSPERWEEK 7 00136 #define DAYSPERNYEAR 365 00137 #define DAYSPERLYEAR 366 00138 #define SECSPERHOUR (SECSPERMIN * MINSPERHOUR) 00139 #define SECSPERDAY ((long) SECSPERHOUR * HOURSPERDAY) 00140 #define MONSPERYEAR 12 00141 00142 #define TM_SUNDAY 0 00143 #define TM_MONDAY 1 00144 #define TM_TUESDAY 2 00145 #define TM_WEDNESDAY 3 00146 #define TM_THURSDAY 4 00147 #define TM_FRIDAY 5 00148 #define TM_SATURDAY 6 00149 00150 #define TM_JANUARY 0 00151 #define TM_FEBRUARY 1 00152 #define TM_MARCH 2 00153 #define TM_APRIL 3 00154 #define TM_MAY 4 00155 #define TM_JUNE 5 00156 #define TM_JULY 6 00157 #define TM_AUGUST 7 00158 #define TM_SEPTEMBER 8 00159 #define TM_OCTOBER 9 00160 #define TM_NOVEMBER 10 00161 #define TM_DECEMBER 11 00162 00163 #define TM_YEAR_BASE 1900 00164 00165 #define EPOCH_YEAR 1970 00166 #define EPOCH_WDAY TM_THURSDAY 00167 00168 #define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0)) 00169 00170 /* 00171 ** Since everything in isleap is modulo 400 (or a factor of 400), we know that 00172 ** isleap(y) == isleap(y % 400) 00173 ** and so 00174 ** isleap(a + b) == isleap((a + b) % 400) 00175 ** or 00176 ** isleap(a + b) == isleap(a % 400 + b % 400) 00177 ** This is true even if % means modulo rather than Fortran remainder 00178 ** (which is allowed by C89 but not C99). 00179 ** We use this to avoid addition overflow problems. 00180 */ 00181 00182 #define isleap_sum(a, b) isleap((a) % 400 + (b) % 400) 00183 00184 #endif /* !defined TZFILE_H */