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[platform/upstream/glibc.git] / timezone / tzfile.h

diff --git a/timezone/tzfile.h b/timezone/tzfile.h
index 0921c3c..3a9eee3 100644 (file)
--- a/timezone/tzfile.h
+++ b/timezone/tzfile.h
@@ -4,7 +4,7 @@
 
 /*
 ** This file is in the public domain, so clarified as of
-** 1996-06-05 by Arthur David Olson (arthur_david_olson@nih.gov).
+** 1996-06-05 by Arthur David Olson.
 */
 
 /*
@@ -21,7 +21,7 @@
 
 #ifndef lint
 #ifndef NOID
-static char    tzfilehid[] = "@(#)tzfile.h     7.14";
+static char    tzfilehid[] = "@(#)tzfile.h     8.1";
 #endif /* !defined NOID */
 #endif /* !defined lint */
 
@@ -48,8 +48,9 @@ static char   tzfilehid[] = "@(#)tzfile.h     7.14";
 #define        TZ_MAGIC        "TZif"
 
 struct tzhead {
-       char    tzh_magic[4];           /* TZ_MAGIC */
-       char    tzh_reserved[16];       /* reserved for future use */
+       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 */
@@ -84,18 +85,22 @@ struct tzhead {
 */
 
 /*
+** 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
-/*
-** The TZ_MAX_TIMES value below is enough to handle a bit more than a
-** year's worth of solar time (corrected daily to the nearest second) or
-** 138 years of Pacific Presidential Election time
-** (where there are three time zone transitions every fourth year).
-*/
-#define TZ_MAX_TIMES   370
+#define TZ_MAX_TIMES   1200
 #endif /* !defined TZ_MAX_TIMES */
 
 #ifndef TZ_MAX_TYPES
@@ -105,7 +110,7 @@ struct tzhead {
 #ifdef NOSOLAR
 /*
 ** Must be at least 14 for Europe/Riga as of Jan 12 1995,
-** as noted by Earl Chew <earl@hpato.aus.hp.com>.
+** as noted by Earl Chew.
 */
 #define TZ_MAX_TYPES   20      /* Maximum number of local time types */
 #endif /* !defined NOSOLAR */
@@ -156,33 +161,20 @@ struct tzhead {
 #define EPOCH_YEAR     1970
 #define EPOCH_WDAY     TM_THURSDAY
 
-/*
-** Accurate only for the past couple of centuries;
-** that will probably do.
-*/
-
 #define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
 
-#ifndef USG
-
 /*
-** Use of the underscored variants may cause problems if you move your code to
-** certain System-V-based systems; for maximum portability, use the
-** underscore-free variants.  The underscored variants are provided for
-** backward compatibility only; they may disappear from future versions of
-** this file.
+** 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 SECS_PER_MIN   SECSPERMIN
-#define MINS_PER_HOUR  MINSPERHOUR
-#define HOURS_PER_DAY  HOURSPERDAY
-#define DAYS_PER_WEEK  DAYSPERWEEK
-#define DAYS_PER_NYEAR DAYSPERNYEAR
-#define DAYS_PER_LYEAR DAYSPERLYEAR
-#define SECS_PER_HOUR  SECSPERHOUR
-#define SECS_PER_DAY   SECSPERDAY
-#define MONS_PER_YEAR  MONSPERYEAR
-
-#endif /* !defined USG */
+#define isleap_sum(a, b)       isleap((a) % 400 + (b) % 400)
 
 #endif /* !defined TZFILE_H */