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 #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_reserved[16];       /* reserved for future use */
  65         char    tzh_ttisgmtcnt[4];      /* coded number of trans. time flags */
  66         char    tzh_ttisstdcnt[4];      /* coded number of trans. time flags */
  67         char    tzh_leapcnt[4];         /* coded number of leap seconds */
  68         char    tzh_timecnt[4];         /* coded number of transition times */
  69         char    tzh_typecnt[4];         /* coded number of local time types */
  70         char    tzh_charcnt[4];         /* coded number of abbr. chars */
  71 };
  72
  73 /*
  74 ** . . .followed by. . .
  75 **
  76 **      tzh_timecnt (char [4])s         coded transition times a la time(2)
  77 **      tzh_timecnt (unsigned char)s    types of local time starting at above
  78 **      tzh_typecnt repetitions of
  79 **              one (char [4])          coded UTC offset in seconds
  80 **              one (unsigned char)     used to set tm_isdst
  81 **              one (unsigned char)     that's an abbreviation list index
  82 **      tzh_charcnt (char)s             '\0'-terminated zone abbreviations
  83 **      tzh_leapcnt repetitions of
  84 **              one (char [4])          coded leap second transition times
  85 **              one (char [4])          total correction after above
  86 **      tzh_ttisstdcnt (char)s          indexed by type; if TRUE, transition
  87 **                                      time is standard time, if FALSE,
  88 **                                      transition time is wall clock time
  89 **                                      if absent, transition times are
  90 **                                      assumed to be wall clock time
  91 **      tzh_ttisgmtcnt (char)s          indexed by type; if TRUE, transition
  92 **                                      time is UTC, if FALSE,
  93 **                                      transition time is local time
  94 **                                      if absent, transition times are
  95 **                                      assumed to be local time
  96 */
  97
  98 /*
  99 ** In the current implementation, "tzset()" refuses to deal with files that
 100 ** exceed any of the limits below.
 101 */
 102
 103 #ifndef TZ_MAX_TIMES
 104 /*
 105 ** The TZ_MAX_TIMES value below is enough to handle a bit more than a
 106 ** year's worth of solar time (corrected daily to the nearest second) or
 107 ** 138 years of Pacific Presidential Election time
 108 ** (where there are three time zone transitions every fourth year).
 109 */
 110 #define TZ_MAX_TIMES    370
 111 #endif /* !defined TZ_MAX_TIMES */
 112
 113 #ifndef TZ_MAX_TYPES
 114 #ifndef NOSOLAR
 115 #define TZ_MAX_TYPES    256 /* Limited by what (unsigned char)'s can hold */
 116 #endif /* !defined NOSOLAR */
 117 #ifdef NOSOLAR
 118 /*
 119 ** Must be at least 14 for Europe/Riga as of Jan 12 1995,
 120 ** as noted by Earl Chew <earl@hpato.aus.hp.com>.
 121 */
 122 #define TZ_MAX_TYPES    20      /* Maximum number of local time types */
 123 #endif /* !defined NOSOLAR */
 124 #endif /* !defined TZ_MAX_TYPES */
 125
 126 #ifndef TZ_MAX_CHARS
 127 #define TZ_MAX_CHARS    50      /* Maximum number of abbreviation characters */
 128                                 /* (limited by what unsigned chars can hold) */
 129 #endif /* !defined TZ_MAX_CHARS */
 130
 131 #ifndef TZ_MAX_LEAPS
 132 #define TZ_MAX_LEAPS    50      /* Maximum number of leap second corrections */
 133 #endif /* !defined TZ_MAX_LEAPS */
 134
 135 #define SECSPERMIN      60
 136 #define MINSPERHOUR     60
 137 #define HOURSPERDAY     24
 138 #define DAYSPERWEEK     7
 139 #define DAYSPERNYEAR    365
 140 #define DAYSPERLYEAR    366
 141 #define SECSPERHOUR     (SECSPERMIN * MINSPERHOUR)
 142 #define SECSPERDAY      ((long) SECSPERHOUR * HOURSPERDAY)
 143 #define MONSPERYEAR     12
 144
 145 #define TM_SUNDAY       0
 146 #define TM_MONDAY       1
 147 #define TM_TUESDAY      2
 148 #define TM_WEDNESDAY    3
 149 #define TM_THURSDAY     4
 150 #define TM_FRIDAY       5
 151 #define TM_SATURDAY     6
 152
 153 #define TM_JANUARY      0
 154 #define TM_FEBRUARY     1
 155 #define TM_MARCH        2
 156 #define TM_APRIL        3
 157 #define TM_MAY          4
 158 #define TM_JUNE         5
 159 #define TM_JULY         6
 160 #define TM_AUGUST       7
 161 #define TM_SEPTEMBER    8
 162 #define TM_OCTOBER      9
 163 #define TM_NOVEMBER     10
 164 #define TM_DECEMBER     11
 165
 166 #define TM_YEAR_BASE    1900
 167
 168 #define EPOCH_YEAR      1970
 169 #define EPOCH_WDAY      TM_THURSDAY
 170
 171 /*
 172 ** Accurate only for the past couple of centuries;
 173 ** that will probably do.
 174 */
 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 #ifndef USG
 193
 194 /*
 195 ** Use of the underscored variants may cause problems if you move your code to
 196 ** certain System-V-based systems; for maximum portability, use the
 197 ** underscore-free variants.  The underscored variants are provided for
 198 ** backward compatibility only; they may disappear from future versions of
 199 ** this file.
 200 */
 201
 202 #define SECS_PER_MIN    SECSPERMIN
 203 #define MINS_PER_HOUR   MINSPERHOUR
 204 #define HOURS_PER_DAY   HOURSPERDAY
 205 #define DAYS_PER_WEEK   DAYSPERWEEK
 206 #define DAYS_PER_NYEAR  DAYSPERNYEAR
 207 #define DAYS_PER_LYEAR  DAYSPERLYEAR
 208 #define SECS_PER_HOUR   SECSPERHOUR
 209 #define SECS_PER_DAY    SECSPERDAY
 210 #define MONS_PER_YEAR   MONSPERYEAR
 211
 212 #endif /* !defined USG */
 213
 214 #endif /* !defined TZFILE_H */