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From: Ole-Hjalmar Kristensen <ole-hjalmar.kristensen@substitute_employer_here.com>
Subject: Re: pragma Pack does not work on GNAT 5.01a for Redhat Linux.
Date: 29 Jun 2007 12:21:46 +0200
Date: 2007-06-29T12:21:46+02:00	[thread overview]
Message-ID: <wvbr6457t611.fsf@sun.com> (raw)
In-Reply-To: m28xacef9k.fsf@mac.com

>>>>> "SW" == Simon Wright <simon.j.wright@mac.com> writes:

    SW> "Bob Spooner" <rls19@psu.edu> writes:
    >> "Simon Wright" <simon.j.wright@mac.com> wrote in message 
    >> news:m2hcp2e4fv.fsf@mac.com...
    >>> 
    >>> There's always a price to pay, of course; the packing isn't dense, and
    >>> it can be quite a challenge to work out what bytes are actually being
    >>> sent (eg, if you find yourself having to talk to C after all).
    >> 
    >> Yes, XDR takes care of things like endianness, etc. that otherwise get in 
    >> the way, but as you point out, there's always a price to be paid for 
    >> generality. In some cases it looks like it even will take care of differing 
    >> floating point representations, although I wonder about out of range 
    >> problems when converting. Isn't there an XDR library for C? I know that 
    >> there is one for Fortran. I would think that as long as you have an XDR 
    >> library for the language with which you need to communicate, you wouldn't 
    >> have to decode the bytes yourself; or have I misunderstood what you are 
    >> saying?

C has had XDR and RPC at least since 1987. Try man xdr or man rpcgen on any unix
box. 

See

[Sun Microsystems
XDR: External Data Representation Standard
Internet Network Working Group
RFC1014 Internet Request For Comments, June 1987]

-- 
   C++: The power, elegance and simplicity of a hand grenade.



  reply	other threads:[~2007-06-29 10:21 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-06-19 13:16 pragma Pack does not work on GNAT 5.01a for Redhat Linux petter_fryklund
2007-06-19 14:02 ` Georg Bauhaus
2007-06-19 14:15   ` petter_fryklund
2007-06-19 16:16 ` Jeffrey R. Carter
2007-06-19 16:23 ` Adam Beneschan
2007-06-20 15:51 ` Bob Spooner
2007-06-20 16:35   ` Adam Beneschan
2007-06-20 20:50   ` Simon Wright
2007-06-21 14:50     ` Bob Spooner
2007-06-22  5:20       ` Simon Wright
2007-06-29 10:21         ` Ole-Hjalmar Kristensen [this message]
2007-07-01 10:57           ` Simon Wright
2007-08-07 10:51             ` Ole-Hjalmar Kristensen
2007-08-10 20:36               ` Simon Wright
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