release/src/router/mysql/sql/tzfile.h

   1 /* Copyright (c) 2004, 2007 MySQL AB
   2
   3    This program is free software; you can redistribute it and/or modify
   4    it under the terms of the GNU General Public License as published by
   5    the Free Software Foundation; version 2 of the License.
   6
   7    This program is distributed in the hope that it will be useful,
   8    but WITHOUT ANY WARRANTY; without even the implied warranty of
   9    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10    GNU General Public License for more details.
  11
  12    You should have received a copy of the GNU General Public License
  13    along with this program; if not, write to the Free Software
  14    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA */
  15
  16 /*
  17    This file is based on public domain code from ftp://elsie.ncih.nist.gov/
  18    Initial source code is in the public domain, so clarified as of
  19    1996-06-05 by Arthur David Olson (arthur_david_olson@nih.gov).
  20 */
  21
  22 /*
  23   Information about time zone files.
  24 */
  25
  26 #ifndef TZDIR
  27 #define TZDIR   "/usr/share/zoneinfo" /* Time zone object file directory */
  28 #endif /* !defined TZDIR */
  29
  30 /*
  31   Each file begins with. . .
  32 */
  33
  34 #define TZ_MAGIC        "TZif"
  35
  36 struct tzhead {
  37         uchar   tzh_magic[4];           /* TZ_MAGIC */
  38         uchar   tzh_reserved[16];       /* reserved for future use */
  39         uchar   tzh_ttisgmtcnt[4];      /* coded number of trans. time flags */
  40         uchar   tzh_ttisstdcnt[4];      /* coded number of trans. time flags */
  41         uchar   tzh_leapcnt[4];         /* coded number of leap seconds */
  42         uchar   tzh_timecnt[4];         /* coded number of transition times */
  43         uchar   tzh_typecnt[4];         /* coded number of local time types */
  44         uchar   tzh_charcnt[4];         /* coded number of abbr. chars */
  45 };
  46
  47 /*
  48   . . .followed by. . .
  49
  50   tzh_timecnt (char [4])s               coded transition times a la time(2)
  51   tzh_timecnt (unsigned char)s          types of local time starting at above
  52   tzh_typecnt repetitions of
  53     one (char [4])                      coded UTC offset in seconds
  54     one (unsigned char)                 used to set tm_isdst
  55     one (unsigned char)                 that's an abbreviation list index
  56   tzh_charcnt (char)s                   '\0'-terminated zone abbreviations
  57   tzh_leapcnt repetitions of
  58     one (char [4])                      coded leap second transition times
  59     one (char [4])                      total correction after above
  60   tzh_ttisstdcnt (char)s                indexed by type; if TRUE, transition
  61                                         time is standard time, if FALSE,
  62                                         transition time is wall clock time
  63                                         if absent, transition times are
  64                                         assumed to be wall clock time
  65   tzh_ttisgmtcnt (char)s                indexed by type; if TRUE, transition
  66                                         time is UTC, if FALSE,
  67                                         transition time is local time
  68                                         if absent, transition times are
  69                                         assumed to be local time
  70 */
  71
  72 /*
  73   In the current implementation, we refuse to deal with files that
  74   exceed any of the limits below.
  75 */
  76
  77 #ifndef TZ_MAX_TIMES
  78 /*
  79   The TZ_MAX_TIMES value below is enough to handle a bit more than a
  80   year's worth of solar time (corrected daily to the nearest second) or
  81   138 years of Pacific Presidential Election time
  82   (where there are three time zone transitions every fourth year).
  83 */
  84 #define TZ_MAX_TIMES    370
  85 #endif /* !defined TZ_MAX_TIMES */
  86
  87 #ifndef TZ_MAX_TYPES
  88 #ifdef SOLAR
  89 #define TZ_MAX_TYPES    256 /* Limited by what (unsigned char)'s can hold */
  90 #else
  91 /*
  92   Must be at least 14 for Europe/Riga as of Jan 12 1995,
  93   as noted by Earl Chew <earl@hpato.aus.hp.com>.
  94 */
  95 #define TZ_MAX_TYPES    20      /* Maximum number of local time types */
  96 #endif /* defined SOLAR */
  97 #endif /* !defined TZ_MAX_TYPES */
  98
  99 #ifndef TZ_MAX_CHARS
 100 #define TZ_MAX_CHARS    50      /* Maximum number of abbreviation characters */
 101                                 /* (limited by what unsigned chars can hold) */
 102 #endif /* !defined TZ_MAX_CHARS */
 103
 104 #ifndef TZ_MAX_LEAPS
 105 #define TZ_MAX_LEAPS    50      /* Maximum number of leap second corrections */
 106 #endif /* !defined TZ_MAX_LEAPS */
 107
 108 #ifndef TZ_MAX_REV_RANGES
 109 #ifdef SOLAR
 110 /* Solar (Asia/RiyadhXX) zones need significantly bigger TZ_MAX_REV_RANGES */
 111 #define TZ_MAX_REV_RANGES (TZ_MAX_TIMES*2+TZ_MAX_LEAPS*2+2)
 112 #else
 113 #define TZ_MAX_REV_RANGES (TZ_MAX_TIMES+TZ_MAX_LEAPS+2)
 114 #endif
 115 #endif
 116
 117 #define SECS_PER_MIN    60
 118 #define MINS_PER_HOUR   60
 119 #define HOURS_PER_DAY   24
 120 #define DAYS_PER_WEEK   7
 121 #define DAYS_PER_NYEAR  365
 122 #define DAYS_PER_LYEAR  366
 123 #define SECS_PER_HOUR   (SECS_PER_MIN * MINS_PER_HOUR)
 124 #define SECS_PER_DAY    ((long) SECS_PER_HOUR * HOURS_PER_DAY)
 125 #define MONS_PER_YEAR   12
 126
 127 #define TM_YEAR_BASE    1900
 128
 129 #define EPOCH_YEAR      1970
 130
 131 /*
 132   Accurate only for the past couple of centuries,
 133   that will probably do.
 134 */
 135
 136 #define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))