include/tzfile.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25
  26 /*      Copyright (c) 1988 AT&T */
  27 /*        All Rights Reserved   */
  28
  29 #ifndef _TZFILE_H
  30 #define _TZFILE_H
  31
  32 #pragma ident   "%Z%%M% %I%     %E% SMI"
  33
  34 /*
  35  * A part of this file comes from public domain source, so
  36  * clarified as of June 5, 1996 by Arthur David Olson
  37  */
  38
  39 #include <sys/types.h>
  40
  41 /*
  42  * WARNING:
  43  * The interfaces defined in this header file are for Sun private use only.
  44  * The contents of this file are subject to change without notice for the
  45  * future releases.
  46  */
  47
  48 /* For further information, see ctime(3C) and zic(8) man pages. */
  49
  50 /*
  51  * This file is in the public domain, so clarified as of
  52  * 1996-06-05 by Arthur David Olson.
  53  */
  54
  55 /*
  56  * This header is for use ONLY with the time conversion code.
  57  * There is no guarantee that it will remain unchanged,
  58  * or that it will remain at all.
  59  * Do NOT copy it to any system include directory.
  60  * Thank you!
  61  */
  62
  63 /* static char  tzfilehid[] = "@(#)tzfile.h     7.18"; */
  64
  65 /*
  66  * Note: Despite warnings from the authors of this code, Solaris has
  67  * placed this header file in the system include directory.  This was
  68  * probably done in order to build both zic and zdump which are in
  69  * separate source directories, but both use this file.
  70  */
  71
  72 #ifdef  __cplusplus
  73 extern "C" {
  74 #endif
  75
  76 /*
  77  * Information about time zone files.
  78  */
  79
  80 #ifndef TZDIR
  81 #define TZDIR   "/usr/share/lib/zoneinfo" /* Time zone object file directory */
  82 #endif /* !defined TZDIR */
  83
  84 #ifndef TZDEFAULT
  85 #define TZDEFAULT       "localtime"
  86 #endif /* !defined TZDEFAULT */
  87
  88 #ifndef TZDEFRULES
  89 #define TZDEFRULES      "posixrules"
  90 #endif /* !defined TZDEFRULES */
  91
  92 /*
  93  * Each file begins with. . .
  94  */
  95
  96 #define TZ_MAGIC        "TZif"
  97
  98 struct tzhead {
  99         char    tzh_magic[4];           /* TZ_MAGIC */
 100         char    tzh_reserved[16];       /* reserved for future use */
 101         char    tzh_ttisgmtcnt[4];      /* coded number of trans. time flags */
 102         char    tzh_ttisstdcnt[4];      /* coded number of trans. time flags */
 103         char    tzh_leapcnt[4];         /* coded number of leap seconds */
 104         char    tzh_timecnt[4];         /* coded number of transition times */
 105         char    tzh_typecnt[4];         /* coded number of local time types */
 106         char    tzh_charcnt[4];         /* coded number of abbr. chars */
 107 };
 108
 109 /*
 110  * . . .followed by. . .
 111  *
 112  *      tzh_timecnt (char [4])s         coded transition times a la time(2)
 113  *      tzh_timecnt (unsigned char)s    types of local time starting at above
 114  *      tzh_typecnt repetitions of
 115  *              one (char [4])          coded UTC offset in seconds
 116  *              one (unsigned char)     used to set tm_isdst
 117  *              one (unsigned char)     that's an abbreviation list index
 118  *      tzh_charcnt (char)s             '\0'-terminated zone abbreviations
 119  *      tzh_leapcnt repetitions of
 120  *              one (char [4])          coded leap second transition times
 121  *              one (char [4])          total correction after above
 122  *      tzh_ttisstdcnt (char)s          indexed by type; if TRUE, transition
 123  *                                      time is standard time, if FALSE,
 124  *                                      transition time is wall clock time
 125  *                                      if absent, transition times are
 126  *                                      assumed to be wall clock time
 127  *      tzh_ttisgmtcnt (char)s          indexed by type; if TRUE, transition
 128  *                                      time is UTC, if FALSE,
 129  *                                      transition time is local time
 130  *                                      if absent, transition times are
 131  *                                      assumed to be local time
 132  */
 133
 134 /*
 135  * In the current implementation, "tzset()" refuses to deal with files that
 136  * exceed any of the limits below.
 137  */
 138
 139 #ifndef TZ_MAX_TIMES
 140 /*
 141  * The TZ_MAX_TIMES value below is enough to handle a bit more than a
 142  * year's worth of solar time (corrected daily to the nearest second) or
 143  * 138 years of Pacific Presidential Election time
 144  * (where there are three time zone transitions every fourth year).
 145  */
 146 #define TZ_MAX_TIMES    370
 147 #endif /* !defined TZ_MAX_TIMES */
 148
 149 #ifndef TZ_MAX_TYPES
 150 #ifndef NOSOLAR
 151 #define TZ_MAX_TYPES    256 /* Limited by what (unsigned char)'s can hold */
 152 #endif /* !defined NOSOLAR */
 153 #ifdef NOSOLAR
 154 /*
 155  * Must be at least 14 for Europe/Riga as of Jan 12 1995,
 156  * as noted by Earl Chew.
 157  */
 158 #define TZ_MAX_TYPES    20      /* Maximum number of local time types */
 159 #endif /* !defined NOSOLAR */
 160 #endif /* !defined TZ_MAX_TYPES */
 161
 162 #ifndef TZ_MAX_CHARS
 163 #define TZ_MAX_CHARS    50      /* Maximum number of abbreviation characters */
 164                                 /* (limited by what unsigned chars can hold) */
 165 #endif /* !defined TZ_MAX_CHARS */
 166
 167 #ifndef TZ_MAX_LEAPS
 168 #define TZ_MAX_LEAPS    50      /* Maximum number of leap second corrections */
 169 #endif /* !defined TZ_MAX_LEAPS */
 170
 171 #define SECSPERMIN      60
 172 #define MINSPERHOUR     60
 173 #define HOURSPERDAY     24
 174 #define DAYSPERWEEK     7
 175 #define DAYSPERNYEAR    365
 176 #define DAYSPERLYEAR    366
 177 #define SECSPERHOUR     (SECSPERMIN * MINSPERHOUR)
 178 #define SECSPERDAY      ((time_t)SECSPERHOUR * HOURSPERDAY)
 179 #define MONSPERYEAR     12
 180
 181 #define TM_SUNDAY       0
 182 #define TM_MONDAY       1
 183 #define TM_TUESDAY      2
 184 #define TM_WEDNESDAY    3
 185 #define TM_THURSDAY     4
 186 #define TM_FRIDAY       5
 187 #define TM_SATURDAY     6
 188
 189 #define TM_JANUARY      0
 190 #define TM_FEBRUARY     1
 191 #define TM_MARCH        2
 192 #define TM_APRIL        3
 193 #define TM_MAY          4
 194 #define TM_JUNE         5
 195 #define TM_JULY         6
 196 #define TM_AUGUST       7
 197 #define TM_SEPTEMBER    8
 198 #define TM_OCTOBER      9
 199 #define TM_NOVEMBER     10
 200 #define TM_DECEMBER     11
 201
 202 #define TM_YEAR_BASE    1900
 203
 204 #define EPOCH_YEAR      1970
 205 #define EPOCH_WDAY      TM_THURSDAY
 206
 207 #define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
 208
 209 #ifndef USG
 210
 211 /*
 212  * Use of the underscored variants may cause problems if you move your code to
 213  * certain System-V-based systems; for maximum portability, use the
 214  * underscore-free variants.  The underscored variants are provided for
 215  * backward compatibility only; they may disappear from future versions of
 216  * this file.
 217  */
 218
 219 #define SECS_PER_MIN    SECSPERMIN
 220 #define MINS_PER_HOUR   MINSPERHOUR
 221 #define HOURS_PER_DAY   HOURSPERDAY
 222 #define DAYS_PER_WEEK   DAYSPERWEEK
 223 #define DAYS_PER_NYEAR  DAYSPERNYEAR
 224 #define DAYS_PER_LYEAR  DAYSPERLYEAR
 225 #define SECS_PER_HOUR   SECSPERHOUR
 226 #define SECS_PER_DAY    SECSPERDAY
 227 #define MONS_PER_YEAR   MONSPERYEAR
 228
 229 #endif /* !defined USG */
 230
 231 /*
 232  * Since everything in isleap is modulo 400 (or a factor of 400), we know that
 233  *      isleap(y) == isleap(y % 400)
 234  * and so
 235  *      isleap(a + b) == isleap((a + b) % 400)
 236  * or
 237  *      isleap(a + b) == isleap(a % 400 + b % 400)
 238  * This is true even if % means modulo rather than Fortran remainder
 239  * (which is allowed by C89 but not C99).
 240  * We use this to avoid addition overflow problems.
 241  */
 242
 243 #define isleap_sum(a, b)        isleap((a) % 400 + (b) % 400)
 244
 245 #ifdef  __cplusplus
 246 }
 247 #endif
 248
 249 #endif  /* _TZFILE_H */