[Disclaimer: These are the versions of these routines from 23 Feb
1998, and are here for historical reasons; there are more recent
versions.
There are probably some links at
http://www.cyclic.com/~kingdon/free-vms.html
Here are some implemetations of VMS time routines (SYS$BINTIM,
LIB$CVT_VECTIM, &c). Except for the SYS$GETTIM issues mentioned
below, they should be fairly portable. I've glanced at the code but
haven't tried it yet.
I'd like to highlight the design decision to always keep time values
in the 64 bit VMS format in little-endian storage. I'm not really
sure which choice is best.
There is a comment in vmstime.c about 16 bit words in SYS$NUMTIM.
Unless I miscalculated, even if one specifies a delta time all the way
back to the base date (17 Nov 1858), this doesn't kick in until the
year 2042.
While I am here I'll mention the 10,000 day issues for delta times.
The new rules are that SYS$ASCTIM, SYS$BINTIM, and F$CVTIME still have
10,000 day limits and SYS$NUMTIM and the affected LIB$ routines no
longer do (source: "OpenVMS Delta-Time Limit Q&A", May 1997,
which used to be somewhere on http://www.openvms.digital.com/ (perhaps
still is, somewhere)).
-kingdon, Feb 1998]
Return-Path: <paulnank@au1.ibm.com>
From: Paul Nankervis <paulnank@au1.ibm.com>
To: <kingdon@cyclic.com>
Subject: Re: Portable SYS$ASCTIM
Date: Mon, 9 Feb 1998 02:02:41 -0500
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Jim,
OK, here 'tis. The files attached are descrip.h, vmstime.h and vmstime=
.c.
These were written by me out of hours at home in my idle time... :-)
Naturally there is NO warranty! I have no problem distributing this
as public domain for the good of VMS users everywhere, although
I would prefer that my name is maintained in the source...
I have noticed a problem with the implementation of sys$gettim. It uses=
the C library routine time() to find the current time and some systems
do not handle this particularly well. On a VAX/VMS 7.0 system I have
tried it on time() incorrectly (I believe) returns -1. Other VAX system=
s,
or by using GCC instead of DEC C, seem to work OK. Also I have noticed
that the OS2 GCC version returns a time shifted by ten hours (our local=
time offset). Sigh!
If you have requests for bug fixes or enhancements please let me know
and I will attempt to provide them. I wrote these routines as part of a=
package which is coming together rather nicely to read ODS2 disk
volumes (I can already manage volume sets pretty well!). However
I did not know what time routines might be useful to other people so
did not implement things that could have been easily added....
If you have comments or do not receive the files properly please let
me know!!!! (This is the first time I have sent file attachments from
Lotus Notes to the internet!)
Goodluck!
Paul Nankervis
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