1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
5 -- S Y S T E M . A D D R E S S _ I M A G E --
11 -- Copyright (C) 1992,1993,1994,1995,1996 Free Software Foundation, Inc. --
13 -- GNAT is free software; you can redistribute it and/or modify it under --
14 -- terms of the GNU General Public License as published by the Free Soft- --
15 -- ware Foundation; either version 2, or (at your option) any later ver- --
16 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
17 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
18 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
19 -- for more details. You should have received a copy of the GNU General --
20 -- Public License distributed with GNAT; see file COPYING. If not, write --
21 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
22 -- MA 02111-1307, USA. --
24 -- As a special exception, if other files instantiate generics from this --
25 -- unit, or you link this unit with other files to produce an executable, --
26 -- this unit does not by itself cause the resulting executable to be --
27 -- covered by the GNU General Public License. This exception does not --
28 -- however invalidate any other reasons why the executable file might be --
29 -- covered by the GNU Public License. --
31 -- GNAT was originally developed by the GNAT team at New York University. --
32 -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
34 ------------------------------------------------------------------------------
36 with Unchecked_Conversion;
38 function System.Address_Image (A : Address) return String is
40 Result : String (1 .. 2 * Address'Size / Storage_Unit);
42 type Byte is mod 2 ** 8;
46 constant array (Byte range 0 .. 15) of Character := "0123456789ABCDEF";
48 type Bytes is array (1 .. Address'Size / Storage_Unit) of Byte;
49 for Bytes'Size use Address'Size;
51 function To_Bytes is new Unchecked_Conversion (Address, Bytes);
53 Byte_Sequence : constant Bytes := To_Bytes (A);
55 LE : constant := Standard'Default_Bit_Order;
56 BE : constant := 1 - LE;
57 -- Set to 1/0 for True/False for Little-Endian/Big-Endian
59 Start : constant Natural := BE * (1) + LE * (Bytes'Length);
60 Incr : constant Integer := BE * (1) + LE * (-1);
61 -- Start and increment for accessing characters of address string
64 -- Scan address string
68 for N in Bytes'Range loop
69 Result (2 * N - 1) := Hexdigs (Byte_Sequence (Ptr) / 16);
70 Result (2 * N) := Hexdigs (Byte_Sequence (Ptr) mod 16);
76 end System.Address_Image;