CVS log for pgsql/src/timezone/strftime.c

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Sync timezone code with tzcode 2010c from the Olson group.  This fixes some
corner cases that come up in certain timezones (apparently, only those with
lots and lots of distinct TZ transition rules, as far as I can gather from
a quick scan of their archives).  Per suggestion from Jeevan Chalke.

Back-patch to 8.4.  Possibly we need to push this into earlier releases
as well, but I'm hesitant to update them to the 64-bit tzcode without
more thought and testing.

Sync timezone code with tzcode 2010c from the Olson group.  This fixes some
corner cases that come up in certain timezones (apparently, only those with
lots and lots of distinct TZ transition rules, as far as I can gather from
a quick scan of their archives).  Per suggestion from Jeevan Chalke.

Back-patch to 8.4.  Possibly we need to push this into earlier releases
as well, but I'm hesitant to update them to the 64-bit tzcode without
more thought and testing.

8.4 pgindent run, with new combined Linux/FreeBSD/MinGW typedef list
provided by Andrew.

Fix function prototype to silence compiler warnings.

Update timezone code to track the upstream changes since 2003.  In particular
this adds support for 64-bit tzdata files, which is needed to support DST
calculations beyond 2038.  Add a regression test case to give some minimal
confidence that that really works.

Heikki Linnakangas

Remove 576 references of include files that were not needed.

Revert part of recent include patch not ready for application.

Add additional includes needed on some platforms.

Standard pgindent run for 8.1.

Cosmetic improvements to the timezone code: remove the use of the
'register' qualifier, make some function declarations more consistent,
and so on.

Attached patch gets rid of the global timezone in the following steps:

* Changes the APIs to the timezone functions to take a pg_tz pointer as
an argument, representing the timezone to use for the selected
operation.

* Adds a global_timezone variable that represents the current timezone
in the backend as set by SET TIMEZONE (or guc, or env, etc).

* Implements a hash-table cache of loaded tables, so we don't have to
read and parse the TZ file everytime we change a timezone. While not
necesasry now (we don't change timezones very often), I beleive this
will be necessary (or at least good) when "multiple timezones in the
same query" is eventually implemented. And code-wise, this was the time
to do it.


There are no user-visible changes at this time. Implementing the
"multiple zones in one query" is a later step...

This also gets rid of some of the cruft needed to "back out a timezone
change", since we previously couldn't check a timezone unless it was
activated first.

Passes regression tests on win32, linux (slackware 10) and solaris x86.

Magnus Hagander

Pgindent run for 8.0.

Adjust our timezone library to use pg_time_t (typedef'd as int64) in
place of time_t, as per prior discussion.  The behavior does not change
on machines without a 64-bit-int type, but on machines with one, which
is most, we are rid of the bizarre boundary behavior at the edges of
the 32-bit-time_t range (1901 and 2038).  The system will now treat
times over the full supported timestamp range as being in your local
time zone.  It may seem a little bizarre to consider that times in
4000 BC are PST or EST, but this is surely at least as reasonable as
propagating Gregorian calendar rules back that far.

I did not modify the format of the zic timezone database files, which
means that for the moment the system will not know about daylight-savings
periods outside the range 1901-2038.  Given the way the files are set up,
it's not a simple decision like 'widen to 64 bits'; we have to actually
think about the range of years that need to be supported.  We should
probably inquire what the plans of the upstream zic people are before
making any decisions of our own.

pgindent did a pretty awful job on the timezone code, particularly with
respect to doubly-starred comment blocks.  Do some manual cleanup.

Pgindent timezone file, per request from Tom.

Integrate src/timezone library for all platforms.  There is more we can
and should do now that we control our own destiny for timezone handling,
but this commit gets the bulk of the picayune diffs in place.
Magnus Hagander and Tom Lane.