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From: dewar@merv.cs.nyu.edu (Robert Dewar)
Subject: Re: question re Ada equivalent of C function
Date: 1998/02/21
Message-ID: <dewar.888117391@merv>#1/1
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Date: 1998-02-21T00:00:00+00:00
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Brian says

<<Well, that depends. If you just want to reuse some C routines, I'd suggest
that you use Interfaces.C and just reuse them. Otherwise, you'll want to
look at the System and System.Storage_Elements packages for what you want.
If you want to access a Character at some memory address, say
16#CAFEBABE#, you'd do something like this (boilerplate omitted)

...
Mem_Addr : constant Address := To_Address(16#CAFEBABE#);
Mem_Mapped_Char : Character;
for Mem_Mapped_Char'Address use Mem_Addr;
...

which is surprisingly self-explanatory.
>>

This may be self-explanatory, but has nothing at all to do with the inp
and outp routines, which are accesses to the IO/space (and result in
generation of IN/OUT instructions). Brian was mislead here by the
rather confusing wording of the original question.

Note that a C programmer can do this kind of reading directly from a 
memory address even more easily than an Ada programmer, and certainly
does not need library routines for doing it :-) :-)