Sync our copy of the timezone library with IANA release tzcode2016c.

We hadn't done this in about six years, which proves to have been a mistake
because there's been a lot of code churn upstream, making the merge rather
painful.  But putting it off any further isn't going to lessen the pain,
and there are at least two incompatible changes that we need to absorb
before someone starts complaining that --with-system-tzdata doesn't work
at all on their platform, or we get blindsided by a tzdata release that
our out-of-date zic can't compile.  Last week's "time zone abbreviation
differs from POSIX standard" mess was a wake-up call in that regard.

This is a sufficiently large patch that I'm afraid to back-patch it
immediately, though the foregoing considerations imply that we probably
should do so eventually.  For the moment, just put it in HEAD so that
it can get some testing.  Maybe we can wait till the end of the 9.6
beta cycle before deeming it okay.

1 files changed, 10 insertions, 8 deletions

diff --git a/src/timezone/pgtz.h b/src/timezone/pgtz.h
index ad93291d0ac..deee7464ed5 100644
--- a/src/timezone/pgtz.h
+++ b/src/timezone/pgtz.h
@@ -16,25 +16,26 @@
 #ifndef _PGTZ_H
 #define _PGTZ_H
 
-#include "tzfile.h"
 #include "pgtime.h"
+#include "tzfile.h"
 
 
+#define SMALLEST(a, b)	(((a) < (b)) ? (a) : (b))
 #define BIGGEST(a, b)	(((a) > (b)) ? (a) : (b))
 
 struct ttinfo
 {								/* time type information */
-	long		tt_gmtoff;		/* UTC offset in seconds */
-	int			tt_isdst;		/* used to set tm_isdst */
+	int32		tt_gmtoff;		/* UT offset in seconds */
+	bool		tt_isdst;		/* used to set tm_isdst */
 	int			tt_abbrind;		/* abbreviation list index */
-	int			tt_ttisstd;		/* TRUE if transition is std time */
-	int			tt_ttisgmt;		/* TRUE if transition is UTC */
+	bool		tt_ttisstd;		/* transition is std time */
+	bool		tt_ttisgmt;		/* transition is UT */
 };
 
 struct lsinfo
 {								/* leap second information */
 	pg_time_t	ls_trans;		/* transition time */
-	long		ls_corr;		/* correction to apply */
+	int64		ls_corr;		/* correction to apply */
 };
 
 struct state
@@ -43,14 +44,15 @@ struct state
 	int			timecnt;
 	int			typecnt;
 	int			charcnt;
-	int			goback;
-	int			goahead;
+	bool		goback;
+	bool		goahead;
 	pg_time_t	ats[TZ_MAX_TIMES];
 	unsigned char types[TZ_MAX_TIMES];
 	struct ttinfo ttis[TZ_MAX_TYPES];
 	char		chars[BIGGEST(BIGGEST(TZ_MAX_CHARS + 1, 3 /* sizeof gmt */ ),
 										  (2 * (TZ_STRLEN_MAX + 1)))];
 	struct lsinfo lsis[TZ_MAX_LEAPS];
+	int			defaulttype;	/* for early times or if no transitions */
 };