------------------------------------------------------------------------------
--                                                                          --
--                           GNAT ncurses Binding                           --
--                                                                          --
--               Terminal_Interface.Curses.Forms.Field_User_Data            --
--                                                                          --
--                                 B O D Y                                  --
--                                                                          --
--  Version 00.92                                                           --
--                                                                          --
--  The ncurses Ada95 binding is copyrighted 1996 by                        --
--  Juergen Pfeifer, Email: Juergen.Pfeifer@T-Online.de                     --
--                                                                          --
--  Permission is hereby granted to reproduce and distribute this           --
--  binding by any means and for any fee, whether alone or as part          --
--  of a larger distribution, in source or in binary form, PROVIDED         --
--  this notice is included with any such distribution, and is not          --
--  removed from any of its header files. Mention of ncurses and the        --
--  author of this binding in any applications linked with it is            --
--  highly appreciated.                                                     --
--                                                                          --
--  This binding comes AS IS with no warranty, implied or expressed.        --
------------------------------------------------------------------------------
--  Version Control:
--  $Revision: 1.3 $
------------------------------------------------------------------------------
with Unchecked_Conversion;
with Terminal_Interface.Curses.Aux;
use  Terminal_Interface.Curses.Aux;

--  |
--  |=====================================================================
--  | man page form_field_userptr.3x
--  |=====================================================================
--  |
package body Terminal_Interface.Curses.Forms.Field_User_Data is

   function To_Address is new Unchecked_Conversion (User_Access,
                                                    System.Address);
   function To_Pointer is new Unchecked_Conversion (System.Address,
                                                    User_Access);
   --  |
   --  |
   --  |
   procedure Set_User_Data (Fld  : in Field;
                            Data : in User_Access)
   is
      A : constant Field_User_Wrapper_Access := Field_Userptr (Fld);
      B : Field_User_Wrapper_Access;
      R : C_Int;
   begin
      if A = null then
         raise Form_Exception;
      else
         if A.N > 1 then
            B := new Field_User_Wrapper'(T => A.T,
                                         N => 1,
                                         U => To_Address (Data));
            R := Set_Field_Userptr (Fld, B);
            A.N := A.N - 1;
         else
            A.U := To_Address (Data);
         end if;
      end if;
   end Set_User_Data;
   --  |
   --  |
   --  |
   procedure Get_User_Data (Fld  : in  Field;
                            Data : out User_Access)
   is
      A : constant Field_User_Wrapper_Access := Field_Userptr (Fld);
   begin
      if A = null then
         raise Form_Exception;
      else
         Data := To_Pointer (A.U);
      end if;
   end Get_User_Data;
   
end Terminal_Interface.Curses.Forms.Field_User_Data;