time/tzfile.h

   1 #ifndef TZFILE_H
   2
   3 #define TZFILE_H
   4
   5 /*
   6 ** This header is for use ONLY with the time conversion code.
   7 ** There is no guarantee that it will remain unchanged,
   8 ** or that it will remain at all.
   9 ** Do NOT copy it to any system include directory.
  10 ** Thank you!
  11 */
  12
  13 /*
  14 ** ID
  15 */
  16
  17 #ifndef lint
  18 #ifndef NOID
  19 static char     tzfilehid[] = "@(#)tzfile.h     7.7";
  20 #endif /* !defined NOID */
  21 #endif /* !defined lint */
  22
  23 /*
  24 ** Information about time zone files.
  25 */
  26
  27 #ifndef TZDIR
  28 #define TZDIR   "/usr/local/etc/zoneinfo" /* Time zone object file directory */
  29 #endif /* !defined TZDIR */
  30
  31 #ifndef TZDEFAULT
  32 #define TZDEFAULT       "localtime"
  33 #endif /* !defined TZDEFAULT */
  34
  35 #ifndef TZDEFRULES
  36 #define TZDEFRULES      "posixrules"
  37 #endif /* !defined TZDEFRULES */
  38
  39 /*
  40 ** Each file begins with. . .
  41 */
  42
  43 struct tzhead {
  44         char    tzh_reserved[20];       /* reserved for future use */
  45         char    tzh_ttisgmtcnt[4];      /* coded number of trans. time flags */
  46         char    tzh_ttisstdcnt[4];      /* coded number of trans. time flags */
  47         char    tzh_leapcnt[4];         /* coded number of leap seconds */
  48         char    tzh_timecnt[4];         /* coded number of transition times */
  49         char    tzh_typecnt[4];         /* coded number of local time types */
  50         char    tzh_charcnt[4];         /* coded number of abbr. chars */
  51 };
  52
  53 /*
  54 ** . . .followed by. . .
  55 **
  56 **      tzh_timecnt (char [4])s         coded transition times a la time(2)
  57 **      tzh_timecnt (unsigned char)s    types of local time starting at above
  58 **      tzh_typecnt repetitions of
  59 **              one (char [4])          coded GMT offset in seconds
  60 **              one (unsigned char)     used to set tm_isdst
  61 **              one (unsigned char)     that's an abbreviation list index
  62 **      tzh_charcnt (char)s             '\0'-terminated zone abbreviations
  63 **      tzh_leapcnt repetitions of
  64 **              one (char [4])          coded leap second transition times
  65 **              one (char [4])          total correction after above
  66 **      tzh_ttisstdcnt (char)s          indexed by type; if TRUE, transition
  67 **                                      time is standard time, if FALSE,
  68 **                                      transition time is wall clock time
  69 **                                      if absent, transition times are
  70 **                                      assumed to be wall clock time
  71 **      tzh_ttisgmtcnt (char)s          indexed by type; if TRUE, transition
  72 **                                      time is GMT, if FALSE,
  73 **                                      transition time is local time
  74 **                                      if absent, transition times are
  75 **                                      assumed to be local time
  76 */
  77
  78 /*
  79 ** In the current implementation, "tzset()" refuses to deal with files that
  80 ** exceed any of the limits below.
  81 */
  82
  83 #ifndef TZ_MAX_TIMES
  84 /*
  85 ** The TZ_MAX_TIMES value below is enough to handle a bit more than a
  86 ** year's worth of solar time (corrected daily to the nearest second) or
  87 ** 138 years of Pacific Presidential Election time
  88 ** (where there are three time zone transitions every fourth year).
  89 */
  90 #define TZ_MAX_TIMES    370
  91 #endif /* !defined TZ_MAX_TIMES */
  92
  93 #ifndef TZ_MAX_TYPES
  94 #ifndef NOSOLAR
  95 #define TZ_MAX_TYPES    256 /* Limited by what (unsigned char)'s can hold */
  96 #endif /* !defined NOSOLAR */
  97 #ifdef NOSOLAR
  98 /*
  99 ** Must be at least 14 for Europe/Riga as of Jan 12 1995,
 100 ** as noted by Earl Chew <earl@hpato.aus.hp.com>.
 101 */
 102 #define TZ_MAX_TYPES    20      /* Maximum number of local time types */
 103 #endif /* !defined NOSOLAR */
 104 #endif /* !defined TZ_MAX_TYPES */
 105
 106 #ifndef TZ_MAX_CHARS
 107 #define TZ_MAX_CHARS    50      /* Maximum number of abbreviation characters */
 108                                 /* (limited by what unsigned chars can hold) */
 109 #endif /* !defined TZ_MAX_CHARS */
 110
 111 #ifndef TZ_MAX_LEAPS
 112 #define TZ_MAX_LEAPS    50      /* Maximum number of leap second corrections */
 113 #endif /* !defined TZ_MAX_LEAPS */
 114
 115 #define SECSPERMIN      60
 116 #define MINSPERHOUR     60
 117 #define HOURSPERDAY     24
 118 #define DAYSPERWEEK     7
 119 #define DAYSPERNYEAR    365
 120 #define DAYSPERLYEAR    366
 121 #define SECSPERHOUR     (SECSPERMIN * MINSPERHOUR)
 122 #define SECSPERDAY      ((long) SECSPERHOUR * HOURSPERDAY)
 123 #define MONSPERYEAR     12
 124
 125 #define TM_SUNDAY       0
 126 #define TM_MONDAY       1
 127 #define TM_TUESDAY      2
 128 #define TM_WEDNESDAY    3
 129 #define TM_THURSDAY     4
 130 #define TM_FRIDAY       5
 131 #define TM_SATURDAY     6
 132
 133 #define TM_JANUARY      0
 134 #define TM_FEBRUARY     1
 135 #define TM_MARCH        2
 136 #define TM_APRIL        3
 137 #define TM_MAY          4
 138 #define TM_JUNE         5
 139 #define TM_JULY         6
 140 #define TM_AUGUST       7
 141 #define TM_SEPTEMBER    8
 142 #define TM_OCTOBER      9
 143 #define TM_NOVEMBER     10
 144 #define TM_DECEMBER     11
 145
 146 #define TM_YEAR_BASE    1900
 147
 148 #define EPOCH_YEAR      1970
 149 #define EPOCH_WDAY      TM_THURSDAY
 150
 151 /*
 152 ** Accurate only for the past couple of centuries;
 153 ** that will probably do.
 154 */
 155
 156 #define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
 157
 158 #ifndef USG
 159
 160 /*
 161 ** Use of the underscored variants may cause problems if you move your code to
 162 ** certain System-V-based systems; for maximum portability, use the
 163 ** underscore-free variants.  The underscored variants are provided for
 164 ** backward compatibility only; they may disappear from future versions of
 165 ** this file.
 166 */
 167
 168 #define SECS_PER_MIN    SECSPERMIN
 169 #define MINS_PER_HOUR   MINSPERHOUR
 170 #define HOURS_PER_DAY   HOURSPERDAY
 171 #define DAYS_PER_WEEK   DAYSPERWEEK
 172 #define DAYS_PER_NYEAR  DAYSPERNYEAR
 173 #define DAYS_PER_LYEAR  DAYSPERLYEAR
 174 #define SECS_PER_HOUR   SECSPERHOUR
 175 #define SECS_PER_DAY    SECSPERDAY
 176 #define MONS_PER_YEAR   MONSPERYEAR
 177
 178 #endif /* !defined USG */
 179
 180 #endif /* !defined TZFILE_H */