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 (arthur_david_olson@nih.gov).
   8 **
   9 ** $FreeBSD: src/lib/libc/stdtime/tzfile.h,v 1.8 2002/03/22 23:42:05 obrien Exp $
  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     7.14";
  28 */
  29 #endif /* !defined NOID */
  30 #endif /* !defined lint */
  31
  32 /*
  33 ** Information about time zone files.
  34 */
  35
  36 #ifndef TZDIR
  37 #define TZDIR   "/usr/share/zoneinfo" /* Time zone object file directory */
  38 #endif /* !defined TZDIR */
  39
  40 #ifndef TZDEFAULT
  41 #ifdef UNIFDEF_MOVE_LOCALTIME
  42 #define TZDEFAULT       "/var/db/timezone/localtime"
  43 #else /* !UNIFDEF_MOVE_LOCALTIME */
  44 #define TZDEFAULT       "/etc/localtime"
  45 #endif /* UNIFDEF_MOVE_LOCALTIME */
  46 #endif /* !defined TZDEFAULT */
  47
  48 #ifndef TZDEFRULES
  49 #define TZDEFRULES      "posixrules"
  50 #endif /* !defined TZDEFRULES */
  51
  52 /*
  53 ** Each file begins with. . .
  54 */
  55
  56 #define TZ_MAGIC        "TZif"
  57
  58 struct tzhead {
  59         char    tzh_magic[4];           /* TZ_MAGIC */
  60         char    tzh_reserved[16];       /* reserved for future use */
  61         char    tzh_ttisgmtcnt[4];      /* coded number of trans. time flags */
  62         char    tzh_ttisstdcnt[4];      /* coded number of trans. time flags */
  63         char    tzh_leapcnt[4];         /* coded number of leap seconds */
  64         char    tzh_timecnt[4];         /* coded number of transition times */
  65         char    tzh_typecnt[4];         /* coded number of local time types */
  66         char    tzh_charcnt[4];         /* coded number of abbr. chars */
  67 };
  68
  69 /*
  70 ** . . .followed by. . .
  71 **
  72 **      tzh_timecnt (char [4])s         coded transition times a la time(2)
  73 **      tzh_timecnt (unsigned char)s    types of local time starting at above
  74 **      tzh_typecnt repetitions of
  75 **              one (char [4])          coded UTC offset in seconds
  76 **              one (unsigned char)     used to set tm_isdst
  77 **              one (unsigned char)     that's an abbreviation list index
  78 **      tzh_charcnt (char)s             '\0'-terminated zone abbreviations
  79 **      tzh_leapcnt repetitions of
  80 **              one (char [4])          coded leap second transition times
  81 **              one (char [4])          total correction after above
  82 **      tzh_ttisstdcnt (char)s          indexed by type; if TRUE, transition
  83 **                                      time is standard time, if FALSE,
  84 **                                      transition time is wall clock time
  85 **                                      if absent, transition times are
  86 **                                      assumed to be wall clock time
  87 **      tzh_ttisgmtcnt (char)s          indexed by type; if TRUE, transition
  88 **                                      time is UTC, if FALSE,
  89 **                                      transition time is local time
  90 **                                      if absent, transition times are
  91 **                                      assumed to be local time
  92 */
  93
  94 /*
  95 ** In the current implementation, "tzset()" refuses to deal with files that
  96 ** exceed any of the limits below.
  97 */
  98
  99 #ifndef TZ_MAX_TIMES
 100 /*
 101 ** The TZ_MAX_TIMES value below is enough to handle a bit more than a
 102 ** year's worth of solar time (corrected daily to the nearest second) or
 103 ** 138 years of Pacific Presidential Election time
 104 ** (where there are three time zone transitions every fourth year).
 105 */
 106 #define TZ_MAX_TIMES    370
 107 #endif /* !defined TZ_MAX_TIMES */
 108
 109 #ifndef TZ_MAX_TYPES
 110 #ifndef NOSOLAR
 111 #define TZ_MAX_TYPES    256 /* Limited by what (unsigned char)'s can hold */
 112 #endif /* !defined NOSOLAR */
 113 #ifdef NOSOLAR
 114 /*
 115 ** Must be at least 14 for Europe/Riga as of Jan 12 1995,
 116 ** as noted by Earl Chew <earl@hpato.aus.hp.com>.
 117 */
 118 #define TZ_MAX_TYPES    20      /* Maximum number of local time types */
 119 #endif /* !defined NOSOLAR */
 120 #endif /* !defined TZ_MAX_TYPES */
 121
 122 #ifndef TZ_MAX_CHARS
 123 #define TZ_MAX_CHARS    50      /* Maximum number of abbreviation characters */
 124                                 /* (limited by what unsigned chars can hold) */
 125 #endif /* !defined TZ_MAX_CHARS */
 126
 127 #ifndef TZ_MAX_LEAPS
 128 #define TZ_MAX_LEAPS    50      /* Maximum number of leap second corrections */
 129 #endif /* !defined TZ_MAX_LEAPS */
 130
 131 #define SECSPERMIN      60
 132 #define MINSPERHOUR     60
 133 #define HOURSPERDAY     24
 134 #define DAYSPERWEEK     7
 135 #define DAYSPERNYEAR    365
 136 #define DAYSPERLYEAR    366
 137 #define SECSPERHOUR     (SECSPERMIN * MINSPERHOUR)
 138 #define SECSPERDAY      ((long) SECSPERHOUR * HOURSPERDAY)
 139 #define MONSPERYEAR     12
 140
 141 #define TM_SUNDAY       0
 142 #define TM_MONDAY       1
 143 #define TM_TUESDAY      2
 144 #define TM_WEDNESDAY    3
 145 #define TM_THURSDAY     4
 146 #define TM_FRIDAY       5
 147 #define TM_SATURDAY     6
 148
 149 #define TM_JANUARY      0
 150 #define TM_FEBRUARY     1
 151 #define TM_MARCH        2
 152 #define TM_APRIL        3
 153 #define TM_MAY          4
 154 #define TM_JUNE         5
 155 #define TM_JULY         6
 156 #define TM_AUGUST       7
 157 #define TM_SEPTEMBER    8
 158 #define TM_OCTOBER      9
 159 #define TM_NOVEMBER     10
 160 #define TM_DECEMBER     11
 161
 162 #define TM_YEAR_BASE    1900
 163
 164 #define EPOCH_YEAR      1970
 165 #define EPOCH_WDAY      TM_THURSDAY
 166
 167 /*
 168 ** Accurate only for the past couple of centuries;
 169 ** that will probably do.
 170 */
 171
 172 #define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
 173
 174 /*
 175 ** Since everything in isleap is modulo 400 (or a factor of 400), we know that
 176 **      isleap(y) == isleap(y % 400)
 177 ** and so
 178 **      isleap(a + b) == isleap((a + b) % 400)
 179 ** or
 180 **      isleap(a + b) == isleap(a % 400 + b % 400)
 181 ** This is true even if % means modulo rather than Fortran remainder
 182 ** (which is allowed by C89 but not C99).
 183 ** We use this to avoid addition overflow problems.
 184 */
 185
 186 #define isleap_sum(a, b)        isleap((a) % 400 + (b) % 400)
 187
 188 #ifndef USG
 189
 190 /*
 191 ** Use of the underscored variants may cause problems if you move your code to
 192 ** certain System-V-based systems; for maximum portability, use the
 193 ** underscore-free variants.  The underscored variants are provided for
 194 ** backward compatibility only; they may disappear from future versions of
 195 ** this file.
 196 */
 197
 198 #define SECS_PER_MIN    SECSPERMIN
 199 #define MINS_PER_HOUR   MINSPERHOUR
 200 #define HOURS_PER_DAY   HOURSPERDAY
 201 #define DAYS_PER_WEEK   DAYSPERWEEK
 202 #define DAYS_PER_NYEAR  DAYSPERNYEAR
 203 #define DAYS_PER_LYEAR  DAYSPERLYEAR
 204 #define SECS_PER_HOUR   SECSPERHOUR
 205 #define SECS_PER_DAY    SECSPERDAY
 206 #define MONS_PER_YEAR   MONSPERYEAR
 207
 208 #endif /* !defined USG */
 209
 210 #endif /* !defined TZFILE_H */