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From: Ludovic Brenta <ludovic@ludovic-brenta.org>
Newsgroups: comp.lang.ada
Subject: Re: Hexadecimal and stream element arrays
Date: Mon, 19 Apr 2010 09:24:26 -0700 (PDT)
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Date: 2010-04-19T09:24:26-07:00
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tonyg wrote on comp.lang.ada:
> On Apr 19, 4:44=A0pm, tonyg <tonytheg...@googlemail.com> wrote:
>
> > I have some data coming in from a serial port which I want to convert
> > to hexadecimal and display on the screen. I was wondering if anyone
> > knows of a simple way to do this?
>
> To make myself more clear I have already dealt with the serial comms
> bit, I am looking to display the stream I have already captured

You could use the predefined library to get a result using the Ada
"syntax for based literal" (ARM A.10.8(14)), e.g. 16#CE#.

   package Stream_Element_IO is
     new Ada.Text_IO.Modular_IO (Num =3D> Ada.Streams.Stream_Element);

   E : Ada.Streams.Stream_Element :=3D ...
begin
   Stream_Element_IO.Put (Item =3D> E, Base =3D> 16);

(There are variants of Put that send the output to a File_Type or to a
string).

If you want to avoid the 16## part, you can easily convert the
stream_elements to a string representation yourself like so:

function To_Hex (E : in Ada.Streams.Stream_Element) return String is
   -- Warning: not compiled and not tested...
   X : constant array (0 .. 15) of Character :=3D
     ('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C',
'D', 'E', 'F');
   Result : String (1 .. Ada.Streams.Stream_Element'Size / 4); -- 1
hex digits =3D 4 bits
   Working_Copy : Ada.Streams.Stream_Element :=3D E;
   use type Ada.Streams.Stream_Element;
   First_Character : Natural :=3D 0;
   Base : constant :=3D 16;
begin
   for K in reverse Result'Length loop
      Result (K) :=3D X (Working_Copy mod Base);
      Working_Copy :=3D Working_Copy / Base;
      if Working_Copy =3D 0 then
         First_Character :=3D K;
         exit;
      end if;
   end loop;
   return Result (First_Character .. Result'Last);
end To_Hex;

Hope this helps.

--
Ludovic Brenta.