stdtime/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 /*
  25 static char     tzfilehid[] = "@(#)tzfile.h     7.14";
  26 */
  27 #endif /* !defined NOID */
  28 #endif /* !defined lint */
  29
  30 /*
  31 ** Information about time zone files.
  32 */
  33
  34 #ifndef TZDIR
  35 #define TZDIR   "/usr/share/zoneinfo" /* Time zone object file directory */
  36 #endif /* !defined TZDIR */
  37
  38 #ifndef TZDEFAULT
  39 #define TZDEFAULT       "/etc/localtime"
  40 #endif /* !defined TZDEFAULT */
  41
  42 #ifndef TZDEFRULES
  43 #define TZDEFRULES      "posixrules"
  44 #endif /* !defined TZDEFRULES */
  45
  46 /*
  47 ** Each file begins with. . .
  48 */
  49
  50 #define TZ_MAGIC        "TZif"
  51
  52 struct tzhead {
  53         char    tzh_magic[4];           /* TZ_MAGIC */
  54         char    tzh_reserved[16];       /* reserved for future use */
  55         char    tzh_ttisgmtcnt[4];      /* coded number of trans. time flags */
  56         char    tzh_ttisstdcnt[4];      /* coded number of trans. time flags */
  57         char    tzh_leapcnt[4];         /* coded number of leap seconds */
  58         char    tzh_timecnt[4];         /* coded number of transition times */
  59         char    tzh_typecnt[4];         /* coded number of local time types */
  60         char    tzh_charcnt[4];         /* coded number of abbr. chars */
  61 };
  62
  63 /*
  64 ** . . .followed by. . .
  65 **
  66 **      tzh_timecnt (char [4])s         coded transition times a la time(2)
  67 **      tzh_timecnt (unsigned char)s    types of local time starting at above
  68 **      tzh_typecnt repetitions of
  69 **              one (char [4])          coded UTC offset in seconds
  70 **              one (unsigned char)     used to set tm_isdst
  71 **              one (unsigned char)     that's an abbreviation list index
  72 **      tzh_charcnt (char)s             '\0'-terminated zone abbreviations
  73 **      tzh_leapcnt repetitions of
  74 **              one (char [4])          coded leap second transition times
  75 **              one (char [4])          total correction after above
  76 **      tzh_ttisstdcnt (char)s          indexed by type; if TRUE, transition
  77 **                                      time is standard time, if FALSE,
  78 **                                      transition time is wall clock time
  79 **                                      if absent, transition times are
  80 **                                      assumed to be wall clock time
  81 **      tzh_ttisgmtcnt (char)s          indexed by type; if TRUE, transition
  82 **                                      time is UTC, if FALSE,
  83 **                                      transition time is local time
  84 **                                      if absent, transition times are
  85 **                                      assumed to be local time
  86 */
  87
  88 /*
  89 ** In the current implementation, "tzset()" refuses to deal with files that
  90 ** exceed any of the limits below.
  91 */
  92
  93 #ifndef TZ_MAX_TIMES
  94 /*
  95 ** The TZ_MAX_TIMES value below is enough to handle a bit more than a
  96 ** year's worth of solar time (corrected daily to the nearest second) or
  97 ** 138 years of Pacific Presidential Election time
  98 ** (where there are three time zone transitions every fourth year).
  99 */
 100 #define TZ_MAX_TIMES    370
 101 #endif /* !defined TZ_MAX_TIMES */
 102
 103 #ifndef TZ_MAX_TYPES
 104 #ifndef NOSOLAR
 105 #define TZ_MAX_TYPES    256 /* Limited by what (unsigned char)'s can hold */
 106 #endif /* !defined NOSOLAR */
 107 #ifdef NOSOLAR
 108 /*
 109 ** Must be at least 14 for Europe/Riga as of Jan 12 1995,
 110 ** as noted by Earl Chew <earl@hpato.aus.hp.com>.
 111 */
 112 #define TZ_MAX_TYPES    20      /* Maximum number of local time types */
 113 #endif /* !defined NOSOLAR */
 114 #endif /* !defined TZ_MAX_TYPES */
 115
 116 #ifndef TZ_MAX_CHARS
 117 #define TZ_MAX_CHARS    50      /* Maximum number of abbreviation characters */
 118                                 /* (limited by what unsigned chars can hold) */
 119 #endif /* !defined TZ_MAX_CHARS */
 120
 121 #ifndef TZ_MAX_LEAPS
 122 #define TZ_MAX_LEAPS    50      /* Maximum number of leap second corrections */
 123 #endif /* !defined TZ_MAX_LEAPS */
 124
 125 #define SECSPERMIN      60
 126 #define MINSPERHOUR     60
 127 #define HOURSPERDAY     24
 128 #define DAYSPERWEEK     7
 129 #define DAYSPERNYEAR    365
 130 #define DAYSPERLYEAR    366
 131 #define SECSPERHOUR     (SECSPERMIN * MINSPERHOUR)
 132 #define SECSPERDAY      ((long) SECSPERHOUR * HOURSPERDAY)
 133 #define MONSPERYEAR     12
 134
 135 #define TM_SUNDAY       0
 136 #define TM_MONDAY       1
 137 #define TM_TUESDAY      2
 138 #define TM_WEDNESDAY    3
 139 #define TM_THURSDAY     4
 140 #define TM_FRIDAY       5
 141 #define TM_SATURDAY     6
 142
 143 #define TM_JANUARY      0
 144 #define TM_FEBRUARY     1
 145 #define TM_MARCH        2
 146 #define TM_APRIL        3
 147 #define TM_MAY          4
 148 #define TM_JUNE         5
 149 #define TM_JULY         6
 150 #define TM_AUGUST       7
 151 #define TM_SEPTEMBER    8
 152 #define TM_OCTOBER      9
 153 #define TM_NOVEMBER     10
 154 #define TM_DECEMBER     11
 155
 156 #define TM_YEAR_BASE    1900
 157
 158 #define EPOCH_YEAR      1970
 159 #define EPOCH_WDAY      TM_THURSDAY
 160
 161 /*
 162 ** Accurate only for the past couple of centuries;
 163 ** that will probably do.
 164 */
 165
 166 #define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
 167
 168 #ifndef USG
 169
 170 /*
 171 ** Use of the underscored variants may cause problems if you move your code to
 172 ** certain System-V-based systems; for maximum portability, use the
 173 ** underscore-free variants.  The underscored variants are provided for
 174 ** backward compatibility only; they may disappear from future versions of
 175 ** this file.
 176 */
 177
 178 #define SECS_PER_MIN    SECSPERMIN
 179 #define MINS_PER_HOUR   MINSPERHOUR
 180 #define HOURS_PER_DAY   HOURSPERDAY
 181 #define DAYS_PER_WEEK   DAYSPERWEEK
 182 #define DAYS_PER_NYEAR  DAYSPERNYEAR
 183 #define DAYS_PER_LYEAR  DAYSPERLYEAR
 184 #define SECS_PER_HOUR   SECSPERHOUR
 185 #define SECS_PER_DAY    SECSPERDAY
 186 #define MONS_PER_YEAR   MONSPERYEAR
 187
 188 #endif /* !defined USG */
 189
 190 #endif /* !defined TZFILE_H */