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From: eachus@spectre.mitre.org (Robert I. Eachus)
Subject: Re: CRC in Ada?
Date: 1997/03/25
Message-ID: <EACHUS.97Mar25184209@spectre.mitre.org>#1/1
X-Deja-AN: 228345379
References: <1997Mar2.220652@nova.wright.edu> <dewar.859141238@merv>
Organization: The Mitre Corp., Bedford, MA.
Newsgroups: comp.lang.ada
Date: 1997-03-25T00:00:00+00:00
List-Id: <comp.lang.ada>


In article <E7KIv2.CJ2@world.std.com> bobduff@world.std.com (Robert A Duff) writes:

  > Well, sure, but on VMS, I can edit text files using several editors, and
  > it seems to work, more or less.  Surely, I can expect Ada.Text_IO to
  > generate files compatible with that mode of operation.  And vice-versa.
  > I mean, when I edit a file in VMS, I don't give a bunch of
  > system-dependent mumbo jumbo about what *sort* of text file I want.

     You've lead a sheltered life Bob. ;-)  When you go to read that
VMS text file using Ada.Text_IO on a Unix box, good luck.  Similarly,
I thought we have all had to deal with the different end-of-line
conventions on Unix and PCs.

     In Ada 83, the rule was if you wanted to do system dependent
low-level I/O you used a package called, Low_Level_IO.  And I don't
want to hear carping about not all compilers supporting Low_Level_IO.
It was a required package (no longer required in Ada 95) and I know of
several validated compilers with useful implementations of
Low_Level_IO that were available in 1984.

     In Ada 95, streams replace Low_Level_IO as a more portable
low-level I/O interface.  But sometimes you have to go bang bits in
device drivers, and then the meaning of your code is, of necessity,
way outside the language standard.
--

					Robert I. Eachus

with Standard_Disclaimer;
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function Message (Text: in Clever_Ideas) return Better_Ideas is...