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From: sources-requ...@munnari.UUCP
Newsgroups: mod.sources
Subject: v08i085:  Public Domain (Table Driven) ``localtime'', Part01/03
Message-ID: <1435@munnari.oz>
Date: Sat, 28-Feb-87 06:49:08 EST
Article-I.D.: munnari.1435
Posted: Sat Feb 28 06:49:08 1987
Date-Received: Sun, 1-Mar-87 13:52:19 EST
Sender: k...@munnari.oz
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Approved: k...@munnari.oz.au

Submitted by: Arthur David Olson <a...@elsie.UUCP>
Mod.sources: Volume 8, Issue 85
Archive-name: pd-localtime/Part01

	[ This is the latest release of the table (file) driven
	  ctime(3), originally released as "settz" in Vol 4 issue 14.

	  Normally, I don't post mod.sources articles that originate
	  outside Australia, but this is something of a special case,
	  in that I've been (slightly) involved in the development.

	  This posting is important in North America (or just the USA?)
	  now, because of forthcoming changes to the Daylight Saving
	  Rules.  I suggest that source licensees install these library
	  functions in libc as soon as possible, then recompile everything
	  that uses localtime() or ctime().  You should never need to go
	  through that again!  (Later versions of this code will likely be
	  available, but they should merely add functionality for new
	  programs, old ones compiled with this release should continue
	  to work).

	  If you have only a binary licence, you should insist that your
	  vendor install this code into its standard release ASAP, and
	  send you an update distribution.  In the meantime, you could
	  install this in your libc.a, and have any sources that you
	  do compile show the time correctly.  This is probably not
	  a real good idea though.

	  It is possible to install this code in a separate library (in
	  fact, that's how it is distributed - as the details of exactly
	  how to update libc.a are too variable to include here), and
	  then explicitly reference it on all compilations that need
	  any of the time functions.

	  There are a number of compilation options, described in the
	  Makefile (be sure to read that before compiling).  I suggest
	  that you define KRE_COMPAT (yes, that's me..) and STD_INSPIRED.
	  If you want compatibility with some of the less broken parts of
	  the time implementations in Sys V, or BSD releases, you can also
	  define USG_COMPAT or BSD_COMPAT respectively.  Finally, TZA_COMPAT
	  will give Vol 4 "settz" release timezone name scheme compatability.
	  You get tzname[] regardless of the setting of USG_COMPAT.  Having
	  it included this way is an arguable benefit, it might remove itself
	  into the USG_COMPAT version in later releases.

	  One program that will cause some problems in compiling, is
	  date(1).  The date patches posted in Vol 6 Issue 12 should help
	  here (you will need TZA_COMPAT, and BSD_COMPAT on BSD systems).
	  A new (public domain) version of date(1) is expected soon.
	  It will use the STD_INSPIRED functions included here, so if
	  you plan on using that when it appears, define STD_INSPIRED now.

	  Problems: With BSD_COMPAT ctime.c will become an empty file.
	  Without STD_INSPIRED timemk.c will become an empty file.
	  In general this is OK (the compiler doesn't mind), however
	  some versions of ranlib(1) simply can't deal with this.
	  Defining STD_INSPIRED will will fix timemk.c.  ctime.c on
	  BSD systems is harder.  If you are going to install this in
	  libc.a, then best if to remove the #ifndef/#endif that surround
	  ctime.c, and the duplicate version of ctime (in #ifdef BSD_COMPAT)
	  in localtime.c.  The problem that is supposed to circumvent
	  will not occur in that case.  If you want to keep these functions
	  in libz.a then easiest is probably to add some nonsense declaration
	  to ctime.c (outside the ifdefs) so that the file is not empty.

	  Finally, you should be aware that this code is designed to work
	  correctly (without changes) regardless of whether time_t is a
	  signed or unsigned type, and however many bits it contains
	  (withing reason), provided only that it is a standard arithmetic
	  type (not an array or struct).  The compiled timezone files
	  produced are host independant (except unfortunately assume that
	  time_t's are 4 bytes long) - the same compiled files can be used
	  from a SUN or a Vax (assuming some remote file system to access
	  them).

	  Vendors: you are expected to provide at least binaries of zic
	  and zdump, as well as the library functions of course, and the
	  sources of the time data files in any release of this code.
	  Providing sources of all this would be an entirely reasonable
	  thing to do.

	  So ends what is probably the longest moderator's note in the
	  history of mod.sources.			... kre ]


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