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From: Brian Rogoff <bpr@shell5.ba.best.com>
Subject: Re: question re Ada equivalent of C function
Date: 1998/02/21
Message-ID: <Pine.BSF.3.96.980221115827.17781A-100000@shell5.ba.best.com>#1/1
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Date: 1998-02-21T00:00:00+00:00
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On Sat, 21 Feb 1998, David Fisher wrote:
> Sorry if this is a bit basic, but learning Ada on one's own can be, er,
> challenging.

You're never alone on comp.lang.ada! :-)

> What are the Ada equivalents of the C functions, inp and outp, used to
> read a byte from or send one to a memory address?

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.

-- Brian