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

--                                                                          --

--                         GNAT RUN-TIME COMPONENTS                         --

--                                                                          --

--                       S Y S T E M . I M G _ B I U                        --

--                                                                          --

--                                 B o d y                                  --

--                                                                          --

--          Copyright (C) 1992-2009 Free Software Foundation, Inc.          --

--                                                                          --

-- 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.Unsigned_Types; use System.Unsigned_Types;

package body System.Img_BIU is

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

   -- Set_Image_Based_Integer --

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

   procedure Set_Image_Based_Integer

     (V : Integer;

      B : Natural;

      W : Integer;

      S : out String;

      P : in out Natural)

   is

      Start : Natural;

   begin

      --  Positive case can just use the unsigned circuit directly

      if V >= 0 then

         Set_Image_Based_Unsigned (Unsigned (V), B, W, S, P);

      --  Negative case has to set a minus sign. Note also that we have to be

      --  careful not to generate overflow with the largest negative number.

      else

         P := P + 1;

         S (P) := ' ';

         Start := P;

         declare

            pragma Suppress (Overflow_Check);

            pragma Suppress (Range_Check);

         begin

            Set_Image_Based_Unsigned (Unsigned (-V), B, W - 1, S, P);

         end;

         --  Set minus sign in last leading blank location. Because of the

         --  code above, there must be at least one such location.

         while S (Start + 1) = ' ' loop

            Start := Start + 1;

         end loop;

         S (Start) := '-';

      end if;

   end Set_Image_Based_Integer;

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

   -- Set_Image_Based_Unsigned --

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

   procedure Set_Image_Based_Unsigned

     (V : Unsigned;

      B : Natural;

      W : Integer;

      S : out String;

      P : in out Natural)

   is

      Start : constant Natural := P;

      F, T  : Natural;

      BU    : constant Unsigned := Unsigned (B);

      Hex   : constant array

                (Unsigned range 0 .. 15) of Character := "0123456789ABCDEF";

      procedure Set_Digits (T : Unsigned);

      --  Set digits of absolute value of T

      procedure Set_Digits (T : Unsigned) is

      begin

         if T >= BU then

            Set_Digits (T / BU);

            P := P + 1;

            S (P) := Hex (T mod BU);

         else

            P := P + 1;

            S (P) := Hex (T);

         end if;

      end Set_Digits;

   --  Start of processing for Set_Image_Based_Unsigned

   begin

      if B >= 10 then

         P := P + 1;

         S (P) := '1';

      end if;

      P := P + 1;

      S (P) := Character'Val (Character'Pos ('0') + B mod 10);

      P := P + 1;

      S (P) := '#';

      Set_Digits (V);

      P := P + 1;

      S (P) := '#';

      --  Add leading spaces if required by width parameter

      if P - Start < W then

         F := P;

         P := Start + W;

         T := P;

         while F > Start loop

            S (T) := S (F);

            T := T - 1;

            F := F - 1;

         end loop;

         for J in Start + 1 .. T loop

            S (J) := ' ';

         end loop;

      end if;

   end Set_Image_Based_Unsigned;

end System.Img_BIU;