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1 706 jeremybenn
------------------------------------------------------------------------------
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--                                                                          --
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--                         GNAT LIBRARY COMPONENTS                          --
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--                                                                          --
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--                 G N A T . D E B U G _ U T I L I T I E S                  --
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--                                                                          --
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--                                 B o d y                                  --
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--                                                                          --
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--                     Copyright (C) 1997-2010, AdaCore                     --
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--                                                                          --
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-- GNAT is free software;  you can  redistribute it  and/or modify it under --
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-- terms of the  GNU General Public License as published  by the Free Soft- --
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-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
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-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
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--                                                                          --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception,   --
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-- version 3.1, as published by the Free Software Foundation.               --
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--                                                                          --
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-- You should have received a copy of the GNU General Public License and    --
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-- a copy of the GCC Runtime Library Exception along with this program;     --
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-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
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-- <http://www.gnu.org/licenses/>.                                          --
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--                                                                          --
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-- GNAT was originally developed  by the GNAT team at  New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc.      --
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--                                                                          --
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------------------------------------------------------------------------------
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with System;                  use System;
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with System.Storage_Elements; use System.Storage_Elements;
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package body GNAT.Debug_Utilities is
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   H : constant array (0 .. 15) of Character := "0123456789ABCDEF";
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   --  Table of hex digits
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   -----------
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   -- Image --
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   -----------
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   --  Address case
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   function Image (A : Address) return Image_String is
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      S : Image_String;
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      P : Natural;
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      N : Integer_Address;
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      U : Natural := 0;
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   begin
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      S (S'Last) := '#';
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      P := Address_Image_Length - 1;
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      N := To_Integer (A);
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      while P > 3 loop
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         if U = 4 then
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            S (P) := '_';
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            P := P - 1;
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            U := 1;
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         else
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            U := U + 1;
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         end if;
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         S (P) := H (Integer (N mod 16));
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         P := P - 1;
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         N := N / 16;
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      end loop;
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      S (1 .. 3) := "16#";
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      return S;
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   end Image;
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   -----------
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   -- Image --
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   -----------
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   --  String case
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   function Image (S : String) return String is
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      W : String (1 .. 2 * S'Length + 2);
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      P : Positive := 1;
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   begin
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      W (1) := '"';
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      for J in S'Range loop
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         if S (J) = '"' then
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            P := P + 1;
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            W (P) := '"';
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         end if;
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         P := P + 1;
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         W (P) := S (J);
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      end loop;
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      P := P + 1;
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      W (P) := '"';
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      return W (1 .. P);
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   end Image;
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   -------------
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   -- Image_C --
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   -------------
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   function Image_C (A : Address) return Image_C_String is
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      S : Image_C_String;
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      N : Integer_Address := To_Integer (A);
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   begin
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      for P in reverse 3 .. S'Last loop
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         S (P) := H (Integer (N mod 16));
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         N := N / 16;
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      end loop;
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      S (1 .. 2) := "0x";
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      return S;
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   end Image_C;
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   -----------
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   -- Value --
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   -----------
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   function Value (S : String) return System.Address is
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      Base : Integer_Address := 10;
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      Res  : Integer_Address := 0;
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      Last : Natural := S'Last;
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      C    : Character;
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      N    : Integer_Address;
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   begin
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      --  Skip final Ada 95 base character
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      if S (Last) = '#' or else S (Last) = ':' then
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         Last := Last - 1;
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      end if;
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      --  Loop through characters
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      for J in S'First .. Last loop
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         C := S (J);
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         --  C format hex constant
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         if C = 'x' then
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            if Res /= 0 then
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               raise Constraint_Error;
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            end if;
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            Base := 16;
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         --  Ada form based literal
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         elsif C = '#' or else C = ':' then
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            Base := Res;
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            Res  := 0;
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         --  Ignore all underlines
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         elsif C = '_' then
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            null;
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         --  Otherwise must have digit
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         else
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            if C in '0' .. '9' then
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               N := Character'Pos (C) - Character'Pos ('0');
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            elsif C in 'A' .. 'F' then
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               N := Character'Pos (C) - (Character'Pos ('A') - 10);
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            elsif C in 'a' .. 'f' then
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               N := Character'Pos (C) - (Character'Pos ('a') - 10);
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            else
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               raise Constraint_Error;
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            end if;
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            if N >= Base then
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               raise Constraint_Error;
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            else
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               Res := Res * Base + N;
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            end if;
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         end if;
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      end loop;
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      return To_Address (Res);
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   end Value;
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end GNAT.Debug_Utilities;

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