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------------------------------------------------------------------------------

--                                                                          --

--                         GNAT LIBRARY COMPONENTS                          --

--                                                                          --

--                 G N A T . D E B U G _ U T I L I T I E S                  --

--                                                                          --

--                                 B o d y                                  --

--                                                                          --

--                     Copyright (C) 1997-2010, AdaCore                     --

--                                                                          --

-- GNAT is free software;  you can  redistribute it  and/or modify it under --

-- terms of the  GNU General Public License as published  by the Free Soft- --

-- ware  Foundation;  either version 3,  or (at your option) any later ver- --

-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --

-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --

-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --

--                                                                          --

-- As a special exception under Section 7 of GPL version 3, you are granted --

-- additional permissions described in the GCC Runtime Library Exception,   --

-- version 3.1, as published by the Free Software Foundation.               --

--                                                                          --

-- You should have received a copy of the GNU General Public License and    --

-- a copy of the GCC Runtime Library Exception along with this program;     --

-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --

-- <http://www.gnu.org/licenses/>.                                          --

--                                                                          --

-- GNAT was originally developed  by the GNAT team at  New York University. --

-- Extensive contributions were provided by Ada Core Technologies Inc.      --

--                                                                          --

------------------------------------------------------------------------------

with System;                  use System;

with System.Storage_Elements; use System.Storage_Elements;

package body GNAT.Debug_Utilities is

   H : constant array (0 .. 15) of Character := "0123456789ABCDEF";

   --  Table of hex digits

   -----------

   -- Image --

   -----------

   --  Address case

   function Image (A : Address) return Image_String is

      S : Image_String;

      P : Natural;

      N : Integer_Address;

      U : Natural := 0;

   begin

      S (S'Last) := '#';

      P := Address_Image_Length - 1;

      N := To_Integer (A);

      while P > 3 loop

         if U = 4 then

            S (P) := '_';

            P := P - 1;

            U := 1;

         else

            U := U + 1;

         end if;

         S (P) := H (Integer (N mod 16));

         P := P - 1;

         N := N / 16;

      end loop;

      S (1 .. 3) := "16#";

      return S;

   end Image;

   -----------

   -- Image --

   -----------

   --  String case

   function Image (S : String) return String is

      W : String (1 .. 2 * S'Length + 2);

      P : Positive := 1;

   begin

      W (1) := '"';

      for J in S'Range loop

         if S (J) = '"' then

            P := P + 1;

            W (P) := '"';

         end if;

         P := P + 1;

         W (P) := S (J);

      end loop;

      P := P + 1;

      W (P) := '"';

      return W (1 .. P);

   end Image;

   -------------

   -- Image_C --

   -------------

   function Image_C (A : Address) return Image_C_String is

      S : Image_C_String;

      N : Integer_Address := To_Integer (A);

   begin

      for P in reverse 3 .. S'Last loop

         S (P) := H (Integer (N mod 16));

         N := N / 16;

      end loop;

      S (1 .. 2) := "0x";

      return S;

   end Image_C;

   -----------

   -- Value --

   -----------

   function Value (S : String) return System.Address is

      Base : Integer_Address := 10;

      Res  : Integer_Address := 0;

      Last : Natural := S'Last;

      C    : Character;

      N    : Integer_Address;

   begin

      --  Skip final Ada 95 base character

      if S (Last) = '#' or else S (Last) = ':' then

         Last := Last - 1;

      end if;

      --  Loop through characters

      for J in S'First .. Last loop

         C := S (J);

         --  C format hex constant

         if C = 'x' then

            if Res /= 0 then

               raise Constraint_Error;

            end if;

            Base := 16;

         --  Ada form based literal

         elsif C = '#' or else C = ':' then

            Base := Res;

            Res  := 0;

         --  Ignore all underlines

         elsif C = '_' then

            null;

         --  Otherwise must have digit

         else

            if C in '0' .. '9' then

               N := Character'Pos (C) - Character'Pos ('0');

            elsif C in 'A' .. 'F' then

               N := Character'Pos (C) - (Character'Pos ('A') - 10);

            elsif C in 'a' .. 'f' then

               N := Character'Pos (C) - (Character'Pos ('a') - 10);

            else

               raise Constraint_Error;

            end if;

            if N >= Base then

               raise Constraint_Error;

            else

               Res := Res * Base + N;

            end if;

         end if;

      end loop;

      return To_Address (Res);

   end Value;

end GNAT.Debug_Utilities;