time/tzfile.h

   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 #ifndef lint
  23 #ifndef NOID
  24 static char     tzfilehid[] = "@(#)tzfile.h     7.9";
  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 struct tzhead {
  49         char    tzh_reserved[20];       /* 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 GMT 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 GMT, 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 */