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