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

--                                                                          --

--                         GNAT RUN-TIME COMPONENTS                         --

--                                                                          --

--    A D A . W I D E _ W I D E _ T E X T _ I O . M O D U L A R  _ 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_Wide_Text_IO.Generic_Aux; use Ada.Wide_Wide_Text_IO.Generic_Aux;

with System.Img_BIU;   use System.Img_BIU;

with System.Img_Uns;   use System.Img_Uns;

with System.Img_LLB;   use System.Img_LLB;

with System.Img_LLU;   use System.Img_LLU;

with System.Img_LLW;   use System.Img_LLW;

with System.Img_WIU;   use System.Img_WIU;

with System.Val_Uns;   use System.Val_Uns;

with System.Val_LLU;   use System.Val_LLU;

package body Ada.Wide_Wide_Text_IO.Modular_Aux is

   use System.Unsigned_Types;

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

   -- Local Subprograms --

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

   procedure Load_Modular

     (File : File_Type;

      Buf  : out String;

      Ptr  : in out Natural);

   --  This is an auxiliary routine that is used to load an possibly signed

   --  modular literal value from the input file into Buf, starting at Ptr + 1.

   --  Ptr is left set to the last character stored.

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

   -- Get_LLU --

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

   procedure Get_LLU

     (File  : File_Type;

      Item  : out Long_Long_Unsigned;

      Width : Field)

   is

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

      Stop : Integer := 0;

      Ptr  : aliased Integer := 1;

   begin

      if Width /= 0 then

         Load_Width (File, Width, Buf, Stop);

         String_Skip (Buf, Ptr);

      else

         Load_Modular (File, Buf, Stop);

      end if;

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

      Check_End_Of_Field (Buf, Stop, Ptr, Width);

   end Get_LLU;

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

   -- Get_Uns --

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

   procedure Get_Uns

     (File  : File_Type;

      Item  : out Unsigned;

      Width : Field)

   is

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

      Stop : Integer := 0;

      Ptr  : aliased Integer := 1;

   begin

      if Width /= 0 then

         Load_Width (File, Width, Buf, Stop);

         String_Skip (Buf, Ptr);

      else

         Load_Modular (File, Buf, Stop);

      end if;

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

      Check_End_Of_Field (Buf, Stop, Ptr, Width);

   end Get_Uns;

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

   -- Gets_LLU --

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

   procedure Gets_LLU

     (From : String;

      Item : out Long_Long_Unsigned;

      Last : out Positive)

   is

      Pos : aliased Integer;

   begin

      String_Skip (From, Pos);

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

      Last := Pos - 1;

   exception

      when Constraint_Error =>

         raise Data_Error;

   end Gets_LLU;

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

   -- Gets_Uns --

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

   procedure Gets_Uns

     (From : String;

      Item : out Unsigned;

      Last : out Positive)

   is

      Pos : aliased Integer;

   begin

      String_Skip (From, Pos);

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

      Last := Pos - 1;

   exception

      when Constraint_Error =>

         raise Data_Error;

   end Gets_Uns;

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

   -- Load_Modular --

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

   procedure Load_Modular

     (File : File_Type;

      Buf  : out String;

      Ptr  : in out Natural)

   is

      Hash_Loc : Natural;

      Loaded   : Boolean;

   begin

      Load_Skip (File);

      --  Note: it is a bit strange to allow a minus sign here, but it seems

      --  consistent with the general behavior expected by the ACVC tests

      --  which is to scan past junk and then signal data error, see ACVC

      --  test CE3704F, case (6), which is for signed integer exponents,

      --  which seems a similar case.

      Load (File, Buf, Ptr, '+', '-');

      Load_Digits (File, Buf, Ptr, Loaded);

      if Loaded then

         Load (File, Buf, Ptr, '#', ':', Loaded);

         if Loaded then

            Hash_Loc := Ptr;

            Load_Extended_Digits (File, Buf, Ptr);

            Load (File, Buf, Ptr, Buf (Hash_Loc));

         end if;

         Load (File, Buf, Ptr, 'E', 'e', Loaded);

         if Loaded then

            --  Note: it is strange to allow a minus sign, since the syntax

            --  does not, but that is what ACVC test CE3704F, case (6) wants

            --  for the signed case, and there seems no good reason to treat

            --  exponents differently for the signed and unsigned cases.

            Load (File, Buf, Ptr, '+', '-');

            Load_Digits (File, Buf, Ptr);

         end if;

      end if;

   end Load_Modular;

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

   -- Put_LLU --

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

   procedure Put_LLU

     (File  : File_Type;

      Item  : Long_Long_Unsigned;

      Width : Field;

      Base  : Number_Base)

   is

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

      Ptr : Natural := 0;

   begin

      if Base = 10 and then Width = 0 then

         Set_Image_Long_Long_Unsigned (Item, Buf, Ptr);

      elsif Base = 10 then

         Set_Image_Width_Long_Long_Unsigned (Item, Width, Buf, Ptr);

      else

         Set_Image_Based_Long_Long_Unsigned (Item, Base, Width, Buf, Ptr);

      end if;

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

   end Put_LLU;

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

   -- Put_Uns --

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

   procedure Put_Uns

     (File  : File_Type;

      Item  : Unsigned;

      Width : Field;

      Base  : Number_Base)

   is

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

      Ptr : Natural := 0;

   begin

      if Base = 10 and then Width = 0 then

         Set_Image_Unsigned (Item, Buf, Ptr);

      elsif Base = 10 then

         Set_Image_Width_Unsigned (Item, Width, Buf, Ptr);

      else

         Set_Image_Based_Unsigned (Item, Base, Width, Buf, Ptr);

      end if;

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

   end Put_Uns;

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

   -- Puts_LLU --

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

   procedure Puts_LLU

     (To   : out String;

      Item : Long_Long_Unsigned;

      Base : Number_Base)

   is

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

      Ptr : Natural := 0;

   begin

      if Base = 10 then

         Set_Image_Width_Long_Long_Unsigned (Item, To'Length, Buf, Ptr);

      else

         Set_Image_Based_Long_Long_Unsigned (Item, Base, To'Length, Buf, Ptr);

      end if;

      if Ptr > To'Length then

         raise Layout_Error;

      else

         To (To'First .. To'First + Ptr - 1) := Buf (1 .. Ptr);

      end if;

   end Puts_LLU;

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

   -- Puts_Uns --

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

   procedure Puts_Uns

     (To   : out String;

      Item : Unsigned;

      Base : Number_Base)

   is

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

      Ptr : Natural := 0;

   begin

      if Base = 10 then

         Set_Image_Width_Unsigned (Item, To'Length, Buf, Ptr);

      else

         Set_Image_Based_Unsigned (Item, Base, To'Length, Buf, Ptr);

      end if;

      if Ptr > To'Length then

         raise Layout_Error;

      else

         To (To'First .. To'First + Ptr - 1) := Buf (1 .. Ptr);

      end if;

   end Puts_Uns;

end Ada.Wide_Wide_Text_IO.Modular_Aux;