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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: Does Ada support endiannes?
Date: Thu, 15 Dec 2011 14:37:54 +0100
Organization: cbb software GmbH
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Date: 2011-12-15T14:37:54+01:00
List-Id: <comp.lang.ada>

On Thu, 15 Dec 2011 03:27:48 -0800 (PST), Gerd wrote:

> Could you please explain: What do you think how the data send from 68k
> to x86 will be converted from one data layout to the other?

Assuming 68k is big endian, two's complement:

   type Octet is new Unsigned_8;
   function From_Motorola (First, Second : Octet) return Integer_16 is
   begin
      if First > 127 then
         return -1 - Integer_16 (not First) * 256 -
            Integer_16 (not Second);
      else
         return Integer_16 (First) * 256 + Integer_16 (Second);
      end if;
   end From_Motorola;

Note that the code is target machine's endianness agnostic.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de