Check in the pristine copy of ICU 4.6...

icu46/source/tools/tzcode/tzfile.h

+#ifndef TZFILE_H
+
+#define TZFILE_H
+
+/*
+** This file is in the public domain, so clarified as of
+** 1996-06-05 by Arthur David Olson.
+*/
+
+/*
+** This header is for use ONLY with the time conversion code.
+** There is no guarantee that it will remain unchanged,
+** or that it will remain at all.
+** Do NOT copy it to any system include directory.
+** Thank you!
+*/
+
+/*
+** ID
+*/
+
+#ifndef lint
+#ifndef NOID
+static char     tzfilehid[] = "@(#)tzfile.h     8.1";
+#endif /* !defined NOID */
+#endif /* !defined lint */
+
+/*
+** Information about time zone files.
+*/
+
+#ifndef TZDIR
+#define TZDIR   "/usr/local/etc/zoneinfo" /* Time zone object file directory */
+#endif /* !defined TZDIR */
+
+#ifndef TZDEFAULT
+#define TZDEFAULT       "localtime"
+#endif /* !defined TZDEFAULT */
+
+#ifndef TZDEFRULES
+#define TZDEFRULES      "posixrules"
+#endif /* !defined TZDEFRULES */
+
+/*
+** Each file begins with. . .
+*/
+
+#define TZ_MAGIC        "TZif"
+
+struct tzhead {
+        char    tzh_magic[4];           /* TZ_MAGIC */
+        char    tzh_version[1];         /* '\0' or '2' as of 2005 */
+        char    tzh_reserved[15];       /* reserved--must be zero */
+        char    tzh_ttisgmtcnt[4];      /* coded number of trans. time flags */
+        char    tzh_ttisstdcnt[4];      /* coded number of trans. time flags */
+        char    tzh_leapcnt[4];         /* coded number of leap seconds */
+        char    tzh_timecnt[4];         /* coded number of transition times */
+        char    tzh_typecnt[4];         /* coded number of local time types */
+        char    tzh_charcnt[4];         /* coded number of abbr. chars */
+};
+
+/*
+** . . .followed by. . .
+**
+**      tzh_timecnt (char [4])s         coded transition times a la time(2)
+**      tzh_timecnt (unsigned char)s    types of local time starting at above
+**      tzh_typecnt repetitions of
+**              one (char [4])          coded UTC offset in seconds
+**              one (unsigned char)     used to set tm_isdst
+**              one (unsigned char)     that's an abbreviation list index
+**      tzh_charcnt (char)s             '\0'-terminated zone abbreviations
+**      tzh_leapcnt repetitions of
+**              one (char [4])          coded leap second transition times
+**              one (char [4])          total correction after above
+**      tzh_ttisstdcnt (char)s          indexed by type; if TRUE, transition
+**                                      time is standard time, if FALSE,
+**                                      transition time is wall clock time
+**                                      if absent, transition times are
+**                                      assumed to be wall clock time
+**      tzh_ttisgmtcnt (char)s          indexed by type; if TRUE, transition
+**                                      time is UTC, if FALSE,
+**                                      transition time is local time
+**                                      if absent, transition times are
+**                                      assumed to be local time
+*/
+
+/*
+** If tzh_version is '2' or greater, the above is followed by a second instance
+** of tzhead and a second instance of the data in which each coded transition
+** time uses 8 rather than 4 chars,
+** then a POSIX-TZ-environment-variable-style string for use in handling
+** instants after the last transition time stored in the file
+** (with nothing between the newlines if there is no POSIX representation for
+** such instants).
+*/
+
+/*
+** In the current implementation, "tzset()" refuses to deal with files that
+** exceed any of the limits below.
+*/
+
+#ifndef TZ_MAX_TIMES
+#define TZ_MAX_TIMES    1200
+#endif /* !defined TZ_MAX_TIMES */
+
+#ifndef TZ_MAX_TYPES
+#ifndef NOSOLAR
+#define TZ_MAX_TYPES    256 /* Limited by what (unsigned char)'s can hold */
+#endif /* !defined NOSOLAR */
+#ifdef NOSOLAR
+/*
+** Must be at least 14 for Europe/Riga as of Jan 12 1995,
+** as noted by Earl Chew.
+*/
+#define TZ_MAX_TYPES    20      /* Maximum number of local time types */
+#endif /* !defined NOSOLAR */
+#endif /* !defined TZ_MAX_TYPES */
+
+#ifndef TZ_MAX_CHARS
+#define TZ_MAX_CHARS    50      /* Maximum number of abbreviation characters */
+                                /* (limited by what unsigned chars can hold) */
+#endif /* !defined TZ_MAX_CHARS */
+
+#ifndef TZ_MAX_LEAPS
+#define TZ_MAX_LEAPS    50      /* Maximum number of leap second corrections */
+#endif /* !defined TZ_MAX_LEAPS */
+
+#define SECSPERMIN      60
+#define MINSPERHOUR     60
+#define HOURSPERDAY     24
+#define DAYSPERWEEK     7
+#define DAYSPERNYEAR    365
+#define DAYSPERLYEAR    366
+#define SECSPERHOUR     (SECSPERMIN * MINSPERHOUR)
+#define SECSPERDAY      ((long) SECSPERHOUR * HOURSPERDAY)
+#define MONSPERYEAR     12
+
+#define TM_SUNDAY       0
+#define TM_MONDAY       1
+#define TM_TUESDAY      2
+#define TM_WEDNESDAY    3
+#define TM_THURSDAY     4
+#define TM_FRIDAY       5
+#define TM_SATURDAY     6
+
+#define TM_JANUARY      0
+#define TM_FEBRUARY     1
+#define TM_MARCH        2
+#define TM_APRIL        3
+#define TM_MAY          4
+#define TM_JUNE         5
+#define TM_JULY         6
+#define TM_AUGUST       7
+#define TM_SEPTEMBER    8
+#define TM_OCTOBER      9
+#define TM_NOVEMBER     10
+#define TM_DECEMBER     11
+
+#define TM_YEAR_BASE    1900
+
+#define EPOCH_YEAR      1970
+#define EPOCH_WDAY      TM_THURSDAY
+
+#define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
+
+/*
+** Since everything in isleap is modulo 400 (or a factor of 400), we know that
+**      isleap(y) == isleap(y % 400)
+** and so
+**      isleap(a + b) == isleap((a + b) % 400)
+** or
+**      isleap(a + b) == isleap(a % 400 + b % 400)
+** This is true even if % means modulo rather than Fortran remainder
+** (which is allowed by C89 but not C99).
+** We use this to avoid addition overflow problems.
+*/
+
+#define isleap_sum(a, b)        isleap((a) % 400 + (b) % 400)
+
+#endif /* !defined TZFILE_H */