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

--                                                                          --

--                         GNAT RUN-TIME COMPONENTS                         --

--                                                                          --

--         A D A . W I D E _ T E X T _ I O . D E C I M A L _ A U X          --

--                                                                          --

--                                 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 Ada.Wide_Text_IO.Generic_Aux; use Ada.Wide_Text_IO.Generic_Aux;

with Ada.Wide_Text_IO.Float_Aux;   use Ada.Wide_Text_IO.Float_Aux;

with System.Img_Dec; use System.Img_Dec;

with System.Img_LLD; use System.Img_LLD;

with System.Val_Dec; use System.Val_Dec;

with System.Val_LLD; use System.Val_LLD;

package body Ada.Wide_Text_IO.Decimal_Aux is

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

   -- Get_Dec --

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

   function Get_Dec

     (File  : File_Type;

      Width : Field;

      Scale : Integer) return Integer

   is

      Buf  : String (1 .. Field'Last);

      Ptr  : aliased Integer;

      Stop : Integer := 0;

      Item : Integer;

   begin

      if Width /= 0 then

         Load_Width (File, Width, Buf, Stop);

         String_Skip (Buf, Ptr);

      else

         Load_Real (File, Buf, Stop);

         Ptr := 1;

      end if;

      Item := Scan_Decimal (Buf, Ptr'Access, Stop, Scale);

      Check_End_Of_Field (Buf, Stop, Ptr, Width);

      return Item;

   end Get_Dec;

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

   -- Get_LLD --

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

   function Get_LLD

     (File  : File_Type;

      Width : Field;

      Scale : Integer) return Long_Long_Integer

   is

      Buf  : String (1 .. Field'Last);

      Ptr  : aliased Integer;

      Stop : Integer := 0;

      Item : Long_Long_Integer;

   begin

      if Width /= 0 then

         Load_Width (File, Width, Buf, Stop);

         String_Skip (Buf, Ptr);

      else

         Load_Real (File, Buf, Stop);

         Ptr := 1;

      end if;

      Item := Scan_Long_Long_Decimal (Buf, Ptr'Access, Stop, Scale);

      Check_End_Of_Field (Buf, Stop, Ptr, Width);

      return Item;

   end Get_LLD;

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

   -- Gets_Dec --

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

   function Gets_Dec

     (From  : String;

      Last  : not null access Positive;

      Scale : Integer) return Integer

   is

      Pos  : aliased Integer;

      Item : Integer;

   begin

      String_Skip (From, Pos);

      Item := Scan_Decimal (From, Pos'Access, From'Last, Scale);

      Last.all := Pos - 1;

      return Item;

   exception

      when Constraint_Error =>

         Last.all := Pos - 1;

         raise Data_Error;

   end Gets_Dec;

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

   -- Gets_LLD --

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

   function Gets_LLD

     (From  : String;

      Last  : not null access Positive;

      Scale : Integer) return Long_Long_Integer

   is

      Pos  : aliased Integer;

      Item : Long_Long_Integer;

   begin

      String_Skip (From, Pos);

      Item := Scan_Long_Long_Decimal (From, Pos'Access, From'Last, Scale);

      Last.all := Pos - 1;

      return Item;

   exception

      when Constraint_Error =>

         Last.all := Pos - 1;

         raise Data_Error;

   end Gets_LLD;

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

   -- Put_Dec --

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

   procedure Put_Dec

     (File  : File_Type;

      Item  : Integer;

      Fore  : Field;

      Aft   : Field;

      Exp   : Field;

      Scale : Integer)

   is

      Buf : String (1 .. Field'Last);

      Ptr : Natural := 0;

   begin

      Set_Image_Decimal (Item, Buf, Ptr, Scale, Fore, Aft, Exp);

      Put_Item (File, Buf (1 .. Ptr));

   end Put_Dec;

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

   -- Put_LLD --

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

   procedure Put_LLD

     (File  : File_Type;

      Item  : Long_Long_Integer;

      Fore  : Field;

      Aft   : Field;

      Exp   : Field;

      Scale : Integer)

   is

      Buf : String (1 .. Field'Last);

      Ptr : Natural := 0;

   begin

      Set_Image_Long_Long_Decimal (Item, Buf, Ptr, Scale, Fore, Aft, Exp);

      Put_Item (File, Buf (1 .. Ptr));

   end Put_LLD;

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

   -- Puts_Dec --

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

   procedure Puts_Dec

     (To    : out String;

      Item  : Integer;

      Aft   : Field;

      Exp   : Field;

      Scale : Integer)

   is

      Buf  : String (1 .. Field'Last);

      Fore : Integer;

      Ptr  : Natural := 0;

   begin

      --  Compute Fore, allowing for Aft digits and the decimal dot

      Fore := To'Length - Field'Max (1, Aft) - 1;

      --  Allow for Exp and two more for E+ or E- if exponent present

      if Exp /= 0 then

         Fore := Fore - 2 - Exp;

      end if;

      --  Make sure we have enough room

      if Fore < 1 then

         raise Layout_Error;

      end if;

      --  Do the conversion and check length of result

      Set_Image_Decimal (Item, Buf, Ptr, Scale, Fore, Aft, Exp);

      if Ptr > To'Length then

         raise Layout_Error;

      else

         To := Buf (1 .. Ptr);

      end if;

   end Puts_Dec;

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

   -- Puts_Dec --

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

   procedure Puts_LLD

     (To    : out String;

      Item  : Long_Long_Integer;

      Aft   : Field;

      Exp   : Field;

      Scale : Integer)

   is

      Buf  : String (1 .. Field'Last);

      Fore : Integer;

      Ptr  : Natural := 0;

   begin

      Fore :=

        (if Exp = 0

         then To'Length - 1 - Aft

         else To'Length - 2 - Aft - Exp);

      if Fore < 1 then

         raise Layout_Error;

      end if;

      Set_Image_Long_Long_Decimal (Item, Buf, Ptr, Scale, Fore, Aft, Exp);

      if Ptr > To'Length then

         raise Layout_Error;

      else

         To := Buf (1 .. Ptr);

      end if;

   end Puts_LLD;

end Ada.Wide_Text_IO.Decimal_Aux;