stdtime/FreeBSD/tzfile.h

   1 #ifndef TZFILE_H
   2 #define TZFILE_H
   3
   4
   5 /*
   6 ** This file is in the public domain, so clarified as of
   7 ** 1996-06-05 by Arthur David Olson.
   8 **
   9 ** $FreeBSD: head/contrib/tzcode/stdtime/tzfile.h 192625 2009-05-23 06:31:50Z edwin $
  10 */
  11
  12 /*
  13 ** This header is for use ONLY with the time conversion code.
  14 ** There is no guarantee that it will remain unchanged,
  15 ** or that it will remain at all.
  16 ** Do NOT copy it to any system include directory.
  17 ** Thank you!
  18 */
  19
  20 /*
  21 ** ID
  22 */
  23
  24 #ifndef lint
  25 #ifndef NOID
  26 /*
  27 static char     tzfilehid[] = "@(#)tzfile.h     8.1";
  28 */
  29 #endif /* !defined NOID */
  30 #endif /* !defined lint */
  31
  32 /*
  33 ** Information about time zone files.
  34 */
  35
  36 #include <TargetConditionals.h>
  37 #include <Availability.h>
  38
  39 /* Time zone object file directory */
  40 #ifndef TZDIR
  41 # if TARGET_OS_SIMULATOR || (TARGET_OS_OSX && __MAC_OS_X_VERSION_MIN_REQUIRED < __MAC_10_13)
  42 #  define TZDIR   "/usr/share/zoneinfo"
  43 # else
  44 #  define TZDIR   "/var/db/timezone/zoneinfo"
  45 # endif
  46 #endif
  47
  48 /* No gurantee is made that the TZDEFAULT symlink will have TZDIR as a prefix.
  49  * However, clients can assume that the final path component of the prefix will
  50  * be "zoneinfo"
  51  */
  52 #ifndef TZDEFAULT
  53 # if TARGET_OS_SIMULATOR || TARGET_OS_OSX
  54 #  define TZDEFAULT       "/etc/localtime"
  55 # else
  56 #  define TZDEFAULT       "/var/db/timezone/localtime"
  57 # endif
  58 #endif
  59
  60 #ifndef TZDEFRULES
  61 #define TZDEFRULES      "posixrules"
  62 #endif /* !defined TZDEFRULES */
  63
  64 /*
  65 ** Each file begins with. . .
  66 */
  67
  68 #define TZ_MAGIC        "TZif"
  69
  70 struct tzhead {
  71         char    tzh_magic[4];           /* TZ_MAGIC */
  72         char    tzh_version[1];         /* '\0' or '2' as of 2005 */
  73         char    tzh_reserved[15];       /* reserved--must be zero */
  74         char    tzh_ttisgmtcnt[4];      /* coded number of trans. time flags */
  75         char    tzh_ttisstdcnt[4];      /* coded number of trans. time flags */
  76         char    tzh_leapcnt[4];         /* coded number of leap seconds */
  77         char    tzh_timecnt[4];         /* coded number of transition times */
  78         char    tzh_typecnt[4];         /* coded number of local time types */
  79         char    tzh_charcnt[4];         /* coded number of abbr. chars */
  80 };
  81
  82 /*
  83 ** . . .followed by. . .
  84 **
  85 **      tzh_timecnt (char [4])s         coded transition times a la time(2)
  86 **      tzh_timecnt (unsigned char)s    types of local time starting at above
  87 **      tzh_typecnt repetitions of
  88 **              one (char [4])          coded UTC offset in seconds
  89 **              one (unsigned char)     used to set tm_isdst
  90 **              one (unsigned char)     that's an abbreviation list index
  91 **      tzh_charcnt (char)s             '\0'-terminated zone abbreviations
  92 **      tzh_leapcnt repetitions of
  93 **              one (char [4])          coded leap second transition times
  94 **              one (char [4])          total correction after above
  95 **      tzh_ttisstdcnt (char)s          indexed by type; if TRUE, transition
  96 **                                      time is standard time, if FALSE,
  97 **                                      transition time is wall clock time
  98 **                                      if absent, transition times are
  99 **                                      assumed to be wall clock time
 100 **      tzh_ttisgmtcnt (char)s          indexed by type; if TRUE, transition
 101 **                                      time is UTC, if FALSE,
 102 **                                      transition time is local time
 103 **                                      if absent, transition times are
 104 **                                      assumed to be local time
 105 */
 106
 107 /*
 108 ** If tzh_version is '2' or greater, the above is followed by a second instance
 109 ** of tzhead and a second instance of the data in which each coded transition
 110 ** time uses 8 rather than 4 chars,
 111 ** then a POSIX-TZ-environment-variable-style string for use in handling
 112 ** instants after the last transition time stored in the file
 113 ** (with nothing between the newlines if there is no POSIX representation for
 114 ** such instants).
 115 */
 116
 117 /*
 118 ** In the current implementation, "tzset()" refuses to deal with files that
 119 ** exceed any of the limits below.
 120 */
 121
 122 #ifndef TZ_MAX_TIMES
 123 #define TZ_MAX_TIMES    1200
 124 #endif /* !defined TZ_MAX_TIMES */
 125
 126 #ifndef TZ_MAX_TYPES
 127 #ifndef NOSOLAR
 128 #define TZ_MAX_TYPES    256 /* Limited by what (unsigned char)'s can hold */
 129 #endif /* !defined NOSOLAR */
 130 #ifdef NOSOLAR
 131 /*
 132 ** Must be at least 14 for Europe/Riga as of Jan 12 1995,
 133 ** as noted by Earl Chew.
 134 */
 135 #define TZ_MAX_TYPES    20      /* Maximum number of local time types */
 136 #endif /* !defined NOSOLAR */
 137 #endif /* !defined TZ_MAX_TYPES */
 138
 139 #ifndef TZ_MAX_CHARS
 140 #define TZ_MAX_CHARS    50      /* Maximum number of abbreviation characters */
 141                                 /* (limited by what unsigned chars can hold) */
 142 #endif /* !defined TZ_MAX_CHARS */
 143
 144 #ifndef TZ_MAX_LEAPS
 145 #define TZ_MAX_LEAPS    50      /* Maximum number of leap second corrections */
 146 #endif /* !defined TZ_MAX_LEAPS */
 147
 148 #define SECSPERMIN      60
 149 #define MINSPERHOUR     60
 150 #define HOURSPERDAY     24
 151 #define DAYSPERWEEK     7
 152 #define DAYSPERNYEAR    365
 153 #define DAYSPERLYEAR    366
 154 #define SECSPERHOUR     (SECSPERMIN * MINSPERHOUR)
 155 #define SECSPERDAY      ((long) SECSPERHOUR * HOURSPERDAY)
 156 #define MONSPERYEAR     12
 157
 158 #define TM_SUNDAY       0
 159 #define TM_MONDAY       1
 160 #define TM_TUESDAY      2
 161 #define TM_WEDNESDAY    3
 162 #define TM_THURSDAY     4
 163 #define TM_FRIDAY       5
 164 #define TM_SATURDAY     6
 165
 166 #define TM_JANUARY      0
 167 #define TM_FEBRUARY     1
 168 #define TM_MARCH        2
 169 #define TM_APRIL        3
 170 #define TM_MAY          4
 171 #define TM_JUNE         5
 172 #define TM_JULY         6
 173 #define TM_AUGUST       7
 174 #define TM_SEPTEMBER    8
 175 #define TM_OCTOBER      9
 176 #define TM_NOVEMBER     10
 177 #define TM_DECEMBER     11
 178
 179 #define TM_YEAR_BASE    1900
 180
 181 #define EPOCH_YEAR      1970
 182 #define EPOCH_WDAY      TM_THURSDAY
 183
 184 #define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
 185
 186 /*
 187 ** Since everything in isleap is modulo 400 (or a factor of 400), we know that
 188 **      isleap(y) == isleap(y % 400)
 189 ** and so
 190 **      isleap(a + b) == isleap((a + b) % 400)
 191 ** or
 192 **      isleap(a + b) == isleap(a % 400 + b % 400)
 193 ** This is true even if % means modulo rather than Fortran remainder
 194 ** (which is allowed by C89 but not C99).
 195 ** We use this to avoid addition overflow problems.
 196 */
 197
 198 #define isleap_sum(a, b)        isleap((a) % 400 + (b) % 400)
 199
 200 #endif /* !defined TZFILE_H */