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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 . F L O A T _ 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_Real;  use System.Img_Real;

with System.Val_Real;  use System.Val_Real;

package body Ada.Wide_Wide_Text_IO.Float_Aux is

   ---------

   -- Get --

   ---------

   procedure Get

     (File  : File_Type;

      Item  : out Long_Long_Float;

      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_Real (File, Buf, Stop);

      end if;

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

      Check_End_Of_Field (Buf, Stop, Ptr, Width);

   end Get;

   ----------

   -- Gets --

   ----------

   procedure Gets

     (From : String;

      Item : out Long_Long_Float;

      Last : out Positive)

   is

      Pos : aliased Integer;

   begin

      String_Skip (From, Pos);

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

      Last := Pos - 1;

   exception

      when Constraint_Error =>

         raise Data_Error;

   end Gets;

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

   -- Load_Real --

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

   procedure Load_Real

     (File : File_Type;

      Buf  : out String;

      Ptr  : in out Natural)

   is

      Loaded   : Boolean;

   begin

      --  Skip initial blanks and load possible sign

      Load_Skip (File);

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

      --  Case of .nnnn

      Load (File, Buf, Ptr, '.', Loaded);

      if Loaded then

         Load_Digits (File, Buf, Ptr, Loaded);

         --  Hopeless junk if no digits loaded

         if not Loaded then

            return;

         end if;

      --  Otherwise must have digits to start

      else

         Load_Digits (File, Buf, Ptr, Loaded);

         --  Hopeless junk if no digits loaded

         if not Loaded then

            return;

         end if;

         --  Based cases

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

         if Loaded then

            --  Case of nnn#.xxx#

            Load (File, Buf, Ptr, '.', Loaded);

            if Loaded then

               Load_Extended_Digits (File, Buf, Ptr);

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

            --  Case of nnn#xxx.[xxx]# or nnn#xxx#

            else

               Load_Extended_Digits (File, Buf, Ptr);

               Load (File, Buf, Ptr, '.', Loaded);

               if Loaded then

                  Load_Extended_Digits (File, Buf, Ptr);

               end if;

               --  As usual, it seems strange to allow mixed base characters,

               --  but that is what ACVC tests expect, see CE3804M, case (3).

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

            end if;

         --  Case of nnn.[nnn] or nnn

         else

            --  Prevent the potential processing of '.' in cases where the

            --  initial digits have a trailing underscore.

            if Buf (Ptr) = '_' then

               return;

            end if;

            Load (File, Buf, Ptr, '.', Loaded);

            if Loaded then

               Load_Digits (File, Buf, Ptr);

            end if;

         end if;

      end if;

      --  Deal with exponent

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

      if Loaded then

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

         Load_Digits (File, Buf, Ptr);

      end if;

   end Load_Real;

   ---------

   -- Put --

   ---------

   procedure Put

     (File : File_Type;

      Item : Long_Long_Float;

      Fore : Field;

      Aft  : Field;

      Exp  : Field)

   is

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

      Ptr : Natural := 0;

   begin

      Set_Image_Real (Item, Buf, Ptr, Fore, Aft, Exp);

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

   end Put;

   ----------

   -- Puts --

   ----------

   procedure Puts

     (To   : out String;

      Item : Long_Long_Float;

      Aft  : Field;

      Exp  : Field)

   is

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

      Ptr    : Natural := 0;

   begin

      Set_Image_Real (Item, Buf, Ptr, Fore => 1, Aft => Aft, Exp => Exp);

      if Ptr > To'Length then

         raise Layout_Error;

      else

         for J in 1 .. Ptr loop

            To (To'Last - Ptr + J) := Buf (J);

         end loop;

         for J in To'First .. To'Last - Ptr loop

            To (J) := ' ';

         end loop;

      end if;

   end Puts;

end Ada.Wide_Wide_Text_IO.Float_Aux;