From: Ken Garlington <GarlingtonKE@lmtas.lmco.com>
Subject: Re: Sequential IO on OpenVMS (was: CRC in Ada?)
Date: 1997/03/24
Date: 1997-03-24T00:00:00+00:00 [thread overview]
Message-ID: <3336DC57.25DB@lmtas.lmco.com> (raw)
In-Reply-To: dewar.859022250@merv
Robert Dewar wrote:
>
> i<<I totally disagree with your use of the term "misuse" here. The only other
> Ada 83 I/O package that can possibly be used to read a binary file is Direct I/O
> >>
>
> Nope, Direct_IO is also unsuitable for simulating stream_io in Ada 83 in a
> portable manner.
>
> As for writing waivers, no one ever rqeuired a waiver for using pragma
> Interface to interface to existing libraries, especially ANSI C libraries,
> the idea is absurd.
Actually, yes they do, if the library becomes delivered as part of the
total
system. (And to answer the obvious follow-up question, yes I have
processed
waivers for assembly routines contained within the Ada run-time!)
The real question is: "So you have to write a waiver. So what?"
> Yes, I know, some procurement people do absurd
> things.
>
> Your "use" of sequential_io was still inappropriate, because you were
> writing highly non-portable code, which might even have broken using
> the next version of the sam e compiler, let alone a different compiler.
By the way, on a related topic: On VAX/OpenVMS systems, the end-of-file
marker
is embedded within the file header. Even for sequential, fixed-length
record files, the EOF can be placed in the middle of a record
(effectively
truncating it). I have recently come to discover that doing Sequential
IO
on such files has what I consider to be a strange outcome: the truncated
record is read normally, and so "garbage" values past the end of the
file
are processed. On the next record read, END_ERROR is raised. Does the
GNAT implementation for Alpha/OpenVMS mimic this philosophy, as opposed
to
(for example) raising DATA_ERROR on the truncated record? Because of
this problem, we have had to switch to "C" I/O for these files...
--
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next prev parent reply other threads:[~1997-03-24 0:00 UTC|newest]
Thread overview: 136+ messages / expand[flat|nested] mbox.gz Atom feed top
1997-03-02 0:00 CRC in Ada? Dr. John B. Matthews
1997-03-03 0:00 ` David Brown
1997-03-03 0:00 ` Tom Moran
1997-03-04 0:00 ` David L Brown
1997-03-04 0:00 ` Robert Dewar
1997-03-05 0:00 ` Stephen Garriga
1997-03-05 0:00 ` Larry Kilgallen
1997-03-05 0:00 ` Robert A Duff
1997-03-05 0:00 ` Larry Kilgallen
1997-03-06 0:00 ` Fergus Henderson
1997-03-06 0:00 ` Robert Dewar
1997-03-06 0:00 ` Larry Kilgallen
1997-03-06 0:00 ` Robert A Duff
1997-03-07 0:00 ` Larry Kilgallen
1997-03-07 0:00 ` Robert A Duff
1997-03-07 0:00 ` Tom Moran
[not found] ` <1997Mar7.202252.1@eisner>
1997-03-08 0:00 ` Robert Dewar
1997-03-09 0:00 ` Geert Bosch
1997-03-11 0:00 ` Robert Dewar
1997-03-12 0:00 ` Mats Weber
1997-03-12 0:00 ` Robert Dewar
1997-03-10 0:00 ` Robert Dewar
1997-03-10 0:00 ` Tom Moran
1997-03-12 0:00 ` Robert Dewar
1997-03-10 0:00 ` Dr. John B. Matthews
1997-03-10 0:00 ` Jim Balter
1997-03-07 0:00 ` Robert Dewar
1997-03-10 0:00 ` Jim Balter
1997-03-06 0:00 ` Robert A Duff
1997-03-06 0:00 ` Larry Kilgallen
1997-03-06 0:00 ` Robert Dewar
1997-03-06 0:00 ` Robert Dewar
1997-03-09 0:00 ` Dr. John B. Matthews
1997-03-06 0:00 ` Robert Dewar
1997-03-10 0:00 ` Tarjei Jensen
1997-03-10 0:00 ` Robert Dewar
1997-03-10 0:00 ` Graham Hughes
1997-03-11 0:00 ` Robert Dewar
1997-03-11 0:00 ` Graham Hughes
1997-03-12 0:00 ` Robert Dewar
1997-03-10 0:00 ` Robert Dewar
1997-03-10 0:00 ` David Brown
1997-03-12 0:00 ` Robert Dewar
1997-03-11 0:00 ` Mark & Zurima McKinney
1997-03-12 0:00 ` Robert I. Eachus
1997-03-12 0:00 ` Ole-Hjalmar Kristensen FOU.TD/DELAB
1997-03-13 0:00 ` Jon S Anthony
1997-03-13 0:00 ` Robert Dewar
1997-03-14 0:00 ` Jim Balter
1997-03-14 0:00 ` Jon S Anthony
1997-03-15 0:00 ` Dr. John B. Matthews
1997-03-15 0:00 ` Robert Dewar
1997-03-17 0:00 ` Jon S Anthony
1997-03-06 0:00 ` Ole-Hjalmar Kristensen FOU.TD/DELAB
1997-03-07 0:00 ` Ole-Hjalmar Kristensen FOU.TD/DELAB
1997-03-07 0:00 ` Robert Dewar
1997-03-08 0:00 ` Robert A Duff
1997-03-10 0:00 ` Jim Balter
1997-03-11 0:00 ` Robert Dewar
1997-03-11 0:00 ` Jim Balter
1997-03-11 0:00 ` Robert Dewar
1997-03-12 0:00 ` Jim Balter
1997-03-14 0:00 ` Richard A. O'Keefe
1997-03-14 0:00 ` Jim Balter
1997-03-06 0:00 ` Ole-Hjalmar Kristensen FOU.TD/DELAB
1997-03-06 0:00 ` Larry Kilgallen
1997-03-09 0:00 ` Robert Dewar
1997-03-06 0:00 ` Graham Hughes
1997-03-06 0:00 ` Robert Dewar
1997-03-07 0:00 ` David Brown
1997-03-07 0:00 ` Ole-Hjalmar Kristensen FOU.TD/DELAB
1997-03-07 0:00 ` Ole-Hjalmar Kristensen FOU.TD/DELAB
1997-03-07 0:00 ` Robert Dewar
1997-03-08 0:00 ` Fergus Henderson
1997-03-10 0:00 ` Jim Balter
1997-03-11 0:00 ` Robert Dewar
1997-03-11 0:00 ` Jim Balter
1997-03-12 0:00 ` Robert Dewar
1997-03-12 0:00 ` Jim Balter
1997-03-14 0:00 ` Samuel Mize
1997-03-11 0:00 ` Jim Balter
1997-03-11 0:00 ` Robert Dewar
1997-03-12 0:00 ` Jim Balter
1997-03-10 0:00 ` Ole-Hjalmar Kristensen FOU.TD/DELAB
1997-03-10 0:00 ` Ole-Hjalmar Kristensen FOU.TD/DELAB
1997-03-10 0:00 ` Robert Dewar
1997-03-10 0:00 ` Jim Balter
1997-03-11 0:00 ` Robert Dewar
1997-03-11 0:00 ` Jim Balter
1997-03-11 0:00 ` Robert Dewar
1997-03-12 0:00 ` Jim Balter
1997-03-11 0:00 ` Fergus Henderson
1997-03-11 0:00 ` Ole-Hjalmar Kristensen FOU.TD/DELAB
1997-03-12 0:00 ` Ole-Hjalmar Kristensen FOU.TD/DELAB
1997-03-12 0:00 ` Ole-Hjalmar Kristensen FOU.TD/DELAB
1997-03-12 0:00 ` Jim Balter
1997-03-04 0:00 ` Jon S Anthony
1997-03-05 0:00 ` Robert Dewar
1997-03-04 0:00 ` Stephen Garriga
1997-03-04 0:00 ` Robert Dewar
1997-03-05 0:00 ` Stephen Garriga
1997-03-15 0:00 ` Michael & Amy Hartsough
1997-03-16 0:00 ` Robert Dewar
1997-03-16 0:00 ` Michael & Amy Hartsough
1997-03-16 0:00 ` Robert Dewar
1997-03-18 0:00 ` Michael & Amy Hartsough
1997-03-19 0:00 ` Robert Dewar
1997-03-20 0:00 ` Michael & Amy Hartsough
1997-03-22 0:00 ` Robert Dewar
1997-03-24 0:00 ` Ken Garlington [this message]
1997-03-24 0:00 ` Sequential IO on OpenVMS (was: CRC in Ada?) Larry Kilgallen
1997-03-22 0:00 ` CRC in Ada? Mark & Zurima McKinney
1997-03-22 0:00 ` Robert Dewar
1997-03-21 0:00 ` Tom Moran
1997-03-23 0:00 ` Robert Dewar
1997-03-23 0:00 ` Tom Moran
1997-03-24 0:00 ` Portable Code (was: CRC in Ada?) Larry Kilgallen
1997-03-24 0:00 ` CRC in Ada? Robert A Duff
1997-03-24 0:00 ` Larry Kilgallen
1997-03-24 0:00 ` Robert A Duff
1997-03-24 0:00 ` Robert Dewar
1997-03-24 0:00 ` Robert A Duff
1997-03-25 0:00 ` Robert I. Eachus
1997-04-01 0:00 ` David Emery
1997-03-04 0:00 ` Tom Moran
1997-03-04 0:00 ` Stephen Garriga
1997-03-04 0:00 ` Matthew Heaney
1997-03-07 0:00 ` John Apa
1997-03-05 0:00 ` David C. Hoos, Sr.
1997-03-05 0:00 ` Laurent Pautet
1997-03-06 0:00 ` Jon S Anthony
2013-11-14 17:39 ` david
2013-11-14 18:55 ` Adam Beneschan
2013-11-14 19:35 ` tmoran
2013-11-14 20:09 ` Dmitry A. Kazakov
2013-11-14 20:40 ` John B. Matthews
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