terminal_interface-curses.adb

# File : terminal_interface-curses.adb

    ------------------------------------------------------------------------------
    --                                                                          --
    --                           GNAT ncurses Binding                           --
    --                                                                          --
    --                        Terminal_Interface.Curses                         --
    --                                                                          --
    --                                 B O D Y                                  --
    --                                                                          --
    ------------------------------------------------------------------------------
    -- Copyright 2018-2020,2024 Thomas E. Dickey                                --
    -- Copyright 2007-2011,2014 Free Software Foundation, Inc.                  --
    --                                                                          --
    -- Permission is hereby granted, free of charge, to any person obtaining a  --
    -- copy of this software and associated documentation files (the            --
    -- "Software"), to deal in the Software without restriction, including      --
    -- without limitation the rights to use, copy, modify, merge, publish,      --
    -- distribute, distribute with modifications, sublicense, and/or sell       --
    -- copies of the Software, and to permit persons to whom the Software is    --
    -- furnished to do so, subject to the following conditions:                 --
    --                                                                          --
    -- The above copyright notice and this permission notice shall be included  --
    -- in all copies or substantial portions of the Software.                   --
    --                                                                          --
    -- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  --
    -- OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               --
    -- MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   --
    -- IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   --
    -- DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    --
    -- OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    --
    -- THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               --
    --                                                                          --
    -- Except as contained in this notice, the name(s) of the above copyright   --
    -- holders shall not be used in advertising or otherwise to promote the     --
    -- sale, use or other dealings in this Software without prior written       --
    -- authorization.                                                           --
    ------------------------------------------------------------------------------
    --  Author: Juergen Pfeifer, 1996
    --  Version Control:
    --  @Revision: 1.17 @
    --  @Date: 2024/03/30 13:24:07 @
    --  Binding Version 01.00
    ------------------------------------------------------------------------------
    with System;

    with Terminal_Interface.Curses.Aux;
    with Interfaces.C;                  use Interfaces.C;
    with Interfaces.C.Strings;          use Interfaces.C.Strings;
    with Ada.Characters.Handling;       use Ada.Characters.Handling;
    with Ada.Strings.Fixed;

    package body Terminal_Interface.Curses is

       use Aux;

       package ASF renames Ada.Strings.Fixed;

       type chtype_array is array (size_t range <>)
          of aliased Attributed_Character;
       pragma Convention (C, chtype_array);

    ------------------------------------------------------------------------------
       function Key_Name (Key : Real_Key_Code) return String
       is
          function Keyname (K : C_Int) return chars_ptr;
          pragma Import (C, Keyname, "keyname");

          Ch : Character;
       begin
          if Key <= Character'Pos (Character'Last) then
             Ch := Character'Val (Key);
             if Is_Control (Ch) then
                return Un_Control (Attributed_Character'(Ch    => Ch,
                                                         Color => Color_Pair'First,
                                                         Attr  => Normal_Video));
             elsif Is_Graphic (Ch) then
                declare
                   S : String (1 .. 1);
                begin
                   S (1) := Ch;
                   return S;
                end;
             else
                return "";
             end if;
          else
             return Fill_String (Keyname (C_Int (Key)));
          end if;
       end Key_Name;

       procedure Key_Name (Key  :  Real_Key_Code;
                           Name : out String)
       is
       begin
          ASF.Move (Key_Name (Key), Name);
       end Key_Name;

    ------------------------------------------------------------------------------
       procedure Init_Screen
       is
          function Initscr return Window;
          pragma Import (C, Initscr, "initscr");

          W : Window;
       begin
          W := Initscr;
          if W = Null_Window then
             raise Curses_Exception;
          end if;
       end Init_Screen;

       procedure End_Windows
       is
          function Endwin return C_Int;
          pragma Import (C, Endwin, "endwin");
       begin
          if Endwin = Curses_Err then
             raise Curses_Exception;
          end if;
       end End_Windows;

       function Is_End_Window return Boolean
       is
          function Isendwin return Curses_Bool;
          pragma Import (C, Isendwin, "isendwin");
       begin
          if Isendwin = Curses_Bool_False then
             return False;
          else
             return True;
          end if;
       end Is_End_Window;
    ------------------------------------------------------------------------------
       procedure Move_Cursor (Win    : Window := Standard_Window;
                              Line   : Line_Position;
                              Column : Column_Position)
       is
          function Wmove (Win    : Window;
                          Line   : C_Int;
                          Column : C_Int
                         ) return C_Int;
          pragma Import (C, Wmove, "wmove");
       begin
          if Wmove (Win, C_Int (Line), C_Int (Column)) = Curses_Err then
             raise Curses_Exception;
          end if;
       end Move_Cursor;
    ------------------------------------------------------------------------------
       procedure Add (Win : Window := Standard_Window;
                      Ch  : Attributed_Character)
       is
          function Waddch (W  : Window;
                           Ch : Attributed_Character) return C_Int;
          pragma Import (C, Waddch, "waddch");
       begin
          if Waddch (Win, Ch) = Curses_Err then
             raise Curses_Exception;
          end if;
       end Add;

       procedure Add (Win : Window := Standard_Window;
                      Ch  : Character)
       is
       begin
          Add (Win,
               Attributed_Character'(Ch    => Ch,
                                     Color => Color_Pair'First,
                                     Attr  => Normal_Video));
       end Add;

       procedure Add
         (Win    : Window := Standard_Window;
          Line   : Line_Position;
          Column : Column_Position;
          Ch     : Attributed_Character)
       is
          function mvwaddch (W  : Window;
                             Y  : C_Int;
                             X  : C_Int;
                             Ch : Attributed_Character) return C_Int;
          pragma Import (C, mvwaddch, "mvwaddch");
       begin
          if mvwaddch (Win, C_Int (Line),
                       C_Int (Column),
                       Ch) = Curses_Err
          then
             raise Curses_Exception;
          end if;
       end Add;

       procedure Add
         (Win    : Window := Standard_Window;
          Line   : Line_Position;
          Column : Column_Position;
          Ch     : Character)
       is
       begin
          Add (Win,
               Line,
               Column,
               Attributed_Character'(Ch    => Ch,
                                     Color => Color_Pair'First,
                                     Attr  => Normal_Video));
       end Add;

       procedure Add_With_Immediate_Echo
         (Win : Window := Standard_Window;
          Ch  : Attributed_Character)
       is
          function Wechochar (W  : Window;
                              Ch : Attributed_Character) return C_Int;
          pragma Import (C, Wechochar, "wechochar");
       begin
          if Wechochar (Win, Ch) = Curses_Err then
             raise Curses_Exception;
          end if;
       end Add_With_Immediate_Echo;

       procedure Add_With_Immediate_Echo
         (Win : Window := Standard_Window;
          Ch  : Character)
       is
       begin
          Add_With_Immediate_Echo
            (Win,
             Attributed_Character'(Ch    => Ch,
                                   Color => Color_Pair'First,
                                   Attr  => Normal_Video));
       end Add_With_Immediate_Echo;
    ------------------------------------------------------------------------------
       function Create (Number_Of_Lines       : Line_Count;
                        Number_Of_Columns     : Column_Count;
                        First_Line_Position   : Line_Position;
                        First_Column_Position : Column_Position) return Window
       is
          function Newwin (Number_Of_Lines       : C_Int;
                           Number_Of_Columns     : C_Int;
                           First_Line_Position   : C_Int;
                           First_Column_Position : C_Int) return Window;
          pragma Import (C, Newwin, "newwin");

          W : Window;
       begin
          W := Newwin (C_Int (Number_Of_Lines),
                       C_Int (Number_Of_Columns),
                       C_Int (First_Line_Position),
                       C_Int (First_Column_Position));
          if W = Null_Window then
             raise Curses_Exception;
          end if;
          return W;
       end Create;

       procedure Delete (Win : in out Window)
       is
          function Wdelwin (W : Window) return C_Int;
          pragma Import (C, Wdelwin, "delwin");
       begin
          if Wdelwin (Win) = Curses_Err then
             raise Curses_Exception;
          end if;
          Win := Null_Window;
       end Delete;

       function Sub_Window
         (Win                   : Window := Standard_Window;
          Number_Of_Lines       : Line_Count;
          Number_Of_Columns     : Column_Count;
          First_Line_Position   : Line_Position;
          First_Column_Position : Column_Position) return Window
       is
          function Subwin
            (Win                   : Window;
             Number_Of_Lines       : C_Int;
             Number_Of_Columns     : C_Int;
             First_Line_Position   : C_Int;
             First_Column_Position : C_Int) return Window;
          pragma Import (C, Subwin, "subwin");

          W : Window;
       begin
          W := Subwin (Win,
                       C_Int (Number_Of_Lines),
                       C_Int (Number_Of_Columns),
                       C_Int (First_Line_Position),
                       C_Int (First_Column_Position));
          if W = Null_Window then
             raise Curses_Exception;
          end if;
          return W;
       end Sub_Window;

       function Derived_Window
         (Win                   : Window := Standard_Window;
          Number_Of_Lines       : Line_Count;
          Number_Of_Columns     : Column_Count;
          First_Line_Position   : Line_Position;
          First_Column_Position : Column_Position) return Window
       is
          function Derwin
            (Win                   : Window;
             Number_Of_Lines       : C_Int;
             Number_Of_Columns     : C_Int;
             First_Line_Position   : C_Int;
             First_Column_Position : C_Int) return Window;
          pragma Import (C, Derwin, "derwin");

          W : Window;
       begin
          W := Derwin (Win,
                       C_Int (Number_Of_Lines),
                       C_Int (Number_Of_Columns),
                       C_Int (First_Line_Position),
                       C_Int (First_Column_Position));
          if W = Null_Window then
             raise Curses_Exception;
          end if;
          return W;
       end Derived_Window;

       function Duplicate (Win : Window) return Window
       is
          function Dupwin (Win : Window) return Window;
          pragma Import (C, Dupwin, "dupwin");

          W : constant Window := Dupwin (Win);
       begin
          if W = Null_Window then
             raise Curses_Exception;
          end if;
          return W;
       end Duplicate;

       procedure Move_Window (Win    : Window;
                              Line   : Line_Position;
                              Column : Column_Position)
       is
          function Mvwin (Win    : Window;
                          Line   : C_Int;
                          Column : C_Int) return C_Int;
          pragma Import (C, Mvwin, "mvwin");
       begin
          if Mvwin (Win, C_Int (Line), C_Int (Column)) = Curses_Err then
             raise Curses_Exception;
          end if;
       end Move_Window;

       procedure Move_Derived_Window (Win    : Window;
                                      Line   : Line_Position;
                                      Column : Column_Position)
       is
          function Mvderwin (Win    : Window;
                             Line   : C_Int;
                             Column : C_Int) return C_Int;
          pragma Import (C, Mvderwin, "mvderwin");
       begin
          if Mvderwin (Win, C_Int (Line), C_Int (Column)) = Curses_Err then
             raise Curses_Exception;
          end if;
       end Move_Derived_Window;

       procedure Set_Synch_Mode (Win  : Window  := Standard_Window;
                                 Mode : Boolean := False)
       is
          function Syncok (Win  : Window;
                           Mode : Curses_Bool) return C_Int;
          pragma Import (C, Syncok, "syncok");
       begin
          if Syncok (Win, Curses_Bool (Boolean'Pos (Mode))) = Curses_Err then
             raise Curses_Exception;
          end if;
       end Set_Synch_Mode;
    ------------------------------------------------------------------------------
       procedure Add (Win : Window := Standard_Window;
                      Str : String;
                      Len : Integer := -1)
       is
          function Waddnstr (Win : Window;
                             Str : char_array;
                             Len : C_Int := -1) return C_Int;
          pragma Import (C, Waddnstr, "waddnstr");

          Txt    : char_array (0 .. Str'Length);
          Length : size_t;
       begin
          To_C (Str, Txt, Length);
          if Waddnstr (Win, Txt, C_Int (Len)) = Curses_Err then
             raise Curses_Exception;
          end if;
       end Add;

       procedure Add
         (Win    : Window := Standard_Window;
          Line   : Line_Position;
          Column : Column_Position;
          Str    : String;
          Len    : Integer := -1)
       is
       begin
          Move_Cursor (Win, Line, Column);
          Add (Win, Str, Len);
       end Add;
    ------------------------------------------------------------------------------
       procedure Add
         (Win : Window := Standard_Window;
          Str : Attributed_String;
          Len : Integer := -1)
       is
          function Waddchnstr (Win : Window;
                               Str : chtype_array;
                               Len : C_Int := -1) return C_Int;
          pragma Import (C, Waddchnstr, "waddchnstr");

          Txt : chtype_array (0 .. Str'Length);
       begin
          for Length in 1 .. size_t (Str'Length) loop
             Txt (Length - 1) := Str (Natural (Length));
          end loop;
          Txt (Str'Length) := Default_Character;
          if Waddchnstr (Win,
                         Txt,
                         C_Int (Len)) = Curses_Err
          then
             raise Curses_Exception;
          end if;
       end Add;

       procedure Add
         (Win    : Window := Standard_Window;
          Line   : Line_Position;
          Column : Column_Position;
          Str    : Attributed_String;
          Len    : Integer := -1)
       is
       begin
          Move_Cursor (Win, Line, Column);
          Add (Win, Str, Len);
       end Add;
    ------------------------------------------------------------------------------
       procedure Border
         (Win                       : Window := Standard_Window;
          Left_Side_Symbol          : Attributed_Character := Default_Character;
          Right_Side_Symbol         : Attributed_Character := Default_Character;
          Top_Side_Symbol           : Attributed_Character := Default_Character;
          Bottom_Side_Symbol        : Attributed_Character := Default_Character;
          Upper_Left_Corner_Symbol  : Attributed_Character := Default_Character;
          Upper_Right_Corner_Symbol : Attributed_Character := Default_Character;
          Lower_Left_Corner_Symbol  : Attributed_Character := Default_Character;
          Lower_Right_Corner_Symbol : Attributed_Character := Default_Character)
       is
          function Wborder (W   : Window;
                            LS  : Attributed_Character;
                            RS  : Attributed_Character;
                            TS  : Attributed_Character;
                            BS  : Attributed_Character;
                            ULC : Attributed_Character;
                            URC : Attributed_Character;
                            LLC : Attributed_Character;
                            LRC : Attributed_Character) return C_Int;
          pragma Import (C, Wborder, "wborder");
       begin
          if Wborder (Win,
                      Left_Side_Symbol,
                      Right_Side_Symbol,
                      Top_Side_Symbol,
                      Bottom_Side_Symbol,
                      Upper_Left_Corner_Symbol,
                      Upper_Right_Corner_Symbol,
                      Lower_Left_Corner_Symbol,
                      Lower_Right_Corner_Symbol) = Curses_Err
          then
             raise Curses_Exception;
          end if;
       end Border;

       procedure Box
         (Win               : Window := Standard_Window;
          Vertical_Symbol   : Attributed_Character := Default_Character;
          Horizontal_Symbol : Attributed_Character := Default_Character)
       is
       begin
          Border (Win,
                  Vertical_Symbol, Vertical_Symbol,
                  Horizontal_Symbol, Horizontal_Symbol);
       end Box;

       procedure Horizontal_Line
         (Win         : Window := Standard_Window;
          Line_Size   : Natural;
          Line_Symbol : Attributed_Character := Default_Character)
       is
          function Whline (W   : Window;
                           Ch  : Attributed_Character;
                           Len : C_Int) return C_Int;
          pragma Import (C, Whline, "whline");
       begin
          if Whline (Win,
                     Line_Symbol,
                     C_Int (Line_Size)) = Curses_Err
          then
             raise Curses_Exception;
          end if;
       end Horizontal_Line;

       procedure Vertical_Line
         (Win         : Window := Standard_Window;
          Line_Size   : Natural;
          Line_Symbol : Attributed_Character := Default_Character)
       is
          function Wvline (W   : Window;
                           Ch  : Attributed_Character;
                           Len : C_Int) return C_Int;
          pragma Import (C, Wvline, "wvline");
       begin
          if Wvline (Win,
                     Line_Symbol,
                     C_Int (Line_Size)) = Curses_Err
          then
             raise Curses_Exception;
          end if;
       end Vertical_Line;

    ------------------------------------------------------------------------------
       function Get_Keystroke (Win : Window := Standard_Window)
         return Real_Key_Code
       is
          function Wgetch (W : Window) return C_Int;
          pragma Import (C, Wgetch, "wgetch");

          C : constant C_Int := Wgetch (Win);
       begin
          if C = Curses_Err then
             return Key_None;
          else
             return Real_Key_Code (C);
          end if;
       end Get_Keystroke;

       procedure Undo_Keystroke (Key : Real_Key_Code)
       is
          function Ungetch (Ch : C_Int) return C_Int;
          pragma Import (C, Ungetch, "ungetch");
       begin
          if Ungetch (C_Int (Key)) = Curses_Err then
             raise Curses_Exception;
          end if;
       end Undo_Keystroke;

       function Has_Key (Key : Special_Key_Code) return Boolean
       is
          function Haskey (Key : C_Int) return C_Int;
          pragma Import (C, Haskey, "has_key");
       begin
          if Haskey (C_Int (Key)) = Curses_False then
             return False;
          else
             return True;
          end if;
       end Has_Key;

       function Is_Function_Key (Key : Special_Key_Code) return Boolean
       is
          L : constant Special_Key_Code  := Special_Key_Code (Natural (Key_F0) +
            Natural (Function_Key_Number'Last));
       begin
          if Key >= Key_F0 and then Key <= L then
             return True;
          else
             return False;
          end if;
       end Is_Function_Key;

       function Function_Key (Key : Real_Key_Code)
                              return Function_Key_Number
       is
       begin
          if Is_Function_Key (Key) then
             return Function_Key_Number (Key - Key_F0);
          else
             raise Constraint_Error;
          end if;
       end Function_Key;

       function Function_Key_Code (Key : Function_Key_Number) return Real_Key_Code
       is
       begin
          return Real_Key_Code (Natural (Key_F0) + Natural (Key));
       end Function_Key_Code;
    ------------------------------------------------------------------------------
       procedure Standout (Win : Window  := Standard_Window;
                           On  : Boolean := True)
       is
          function wstandout (Win : Window) return C_Int;
          pragma Import (C, wstandout, "wstandout");
          function wstandend (Win : Window) return C_Int;
          pragma Import (C, wstandend, "wstandend");

          Err : C_Int;
       begin
          if On then
             Err := wstandout (Win);
          else
             Err := wstandend (Win);
          end if;
          if Err = Curses_Err then
             raise Curses_Exception;
          end if;
       end Standout;

       procedure Switch_Character_Attribute
         (Win  : Window := Standard_Window;
          Attr : Character_Attribute_Set := Normal_Video;
          On   : Boolean := True)
       is
          function Wattron (Win    : Window;
                            C_Attr : Attributed_Character) return C_Int;
          pragma Import (C, Wattron, "wattr_on");
          function Wattroff (Win    : Window;
                             C_Attr : Attributed_Character) return C_Int;
          pragma Import (C, Wattroff, "wattr_off");
          --  In Ada we use the On Boolean to control whether or not we want to
          --  switch on or off the attributes in the set.
          Err : C_Int;
          AC  : constant Attributed_Character := (Ch    => Character'First,
                                                  Color => Color_Pair'First,
                                                  Attr  => Attr);
       begin
          if On then
             Err := Wattron  (Win, AC);
          else
             Err := Wattroff (Win, AC);
          end if;
          if Err = Curses_Err then
             raise Curses_Exception;
          end if;
       end Switch_Character_Attribute;

       procedure Set_Character_Attributes
         (Win   : Window := Standard_Window;
          Attr  : Character_Attribute_Set := Normal_Video;
          Color : Color_Pair := Color_Pair'First)
       is
          function Wattrset (Win    : Window;
                             C_Attr : Attributed_Character) return C_Int;
          pragma Import (C, Wattrset, "wattrset"); -- ??? wattr_set
       begin
          if Wattrset (Win, (Ch => Character'First,
                             Color => Color,
                             Attr => Attr)) = Curses_Err
          then
             raise Curses_Exception;
          end if;
       end Set_Character_Attributes;

       function Get_Character_Attribute (Win : Window := Standard_Window)
                                         return Character_Attribute_Set
       is
          function Wattrget (Win : Window;
                             Atr : access Attributed_Character;
                             Col : access C_Short;
                             Opt : System.Address) return C_Int;
          pragma Import (C, Wattrget, "wattr_get");

          Attr : aliased Attributed_Character;
          Col  : aliased C_Short;
          Res  : constant C_Int := Wattrget (Win, Attr'Access, Col'Access,
                                             System.Null_Address);
       begin
          if Res = Curses_Ok then
             return Attr.Attr;
          else
             raise Curses_Exception;
          end if;
       end Get_Character_Attribute;

       function Get_Character_Attribute (Win : Window := Standard_Window)
                                         return Color_Pair
       is
          function Wattrget (Win : Window;
                             Atr : access Attributed_Character;
                             Col : access C_Short;
                             Opt : System.Address) return C_Int;
          pragma Import (C, Wattrget, "wattr_get");

          Attr : aliased Attributed_Character;
          Col  : aliased C_Short;
          Res  : constant C_Int := Wattrget (Win, Attr'Access, Col'Access,
                                             System.Null_Address);
       begin
          if Res = Curses_Ok then
             return Attr.Color;
          else
             raise Curses_Exception;
          end if;
       end Get_Character_Attribute;

       procedure Set_Color (Win  : Window := Standard_Window;
                            Pair : Color_Pair)
       is
          function Wset_Color (Win   : Window;
                               Color : C_Short;
                               Opts  : C_Void_Ptr) return C_Int;
          pragma Import (C, Wset_Color, "wcolor_set");
       begin
          if Wset_Color (Win,
                         C_Short (Pair),
                         C_Void_Ptr (System.Null_Address)) = Curses_Err
          then
             raise Curses_Exception;
          end if;
       end Set_Color;

       procedure Change_Attributes
         (Win   : Window := Standard_Window;
          Count : Integer := -1;
          Attr  : Character_Attribute_Set := Normal_Video;
          Color : Color_Pair := Color_Pair'First)
       is
          function Wchgat (Win   : Window;
                           Cnt   : C_Int;
                           Attr  : Attributed_Character;
                           Color : C_Short;
                           Opts  : System.Address := System.Null_Address)
                           return C_Int;
          pragma Import (C, Wchgat, "wchgat");
       begin
          if Wchgat (Win,
                     C_Int (Count),
                     (Ch => Character'First,
                      Color => Color_Pair'First,
                      Attr => Attr),
                     C_Short (Color)) = Curses_Err
          then
             raise Curses_Exception;
          end if;
       end Change_Attributes;

       procedure Change_Attributes
         (Win    : Window := Standard_Window;
          Line   : Line_Position := Line_Position'First;
          Column : Column_Position := Column_Position'First;
          Count  : Integer := -1;
          Attr   : Character_Attribute_Set := Normal_Video;
          Color  : Color_Pair := Color_Pair'First)
       is
       begin
          Move_Cursor (Win, Line, Column);
          Change_Attributes (Win, Count, Attr, Color);
       end Change_Attributes;
    ------------------------------------------------------------------------------
       procedure Beep
       is
          function Beeper return C_Int;
          pragma Import (C, Beeper, "beep");
       begin
          if Beeper = Curses_Err then
             raise Curses_Exception;
          end if;
       end Beep;

       procedure Flash_Screen
       is
          function Flash return C_Int;
          pragma Import (C, Flash, "flash");
       begin
          if Flash = Curses_Err then
             raise Curses_Exception;
          end if;
       end Flash_Screen;
    ------------------------------------------------------------------------------
       procedure Set_Cbreak_Mode (SwitchOn : Boolean := True)
       is
          function Cbreak return C_Int;
          pragma Import (C, Cbreak, "cbreak");
          function NoCbreak return C_Int;
          pragma Import (C, NoCbreak, "nocbreak");

          Err : C_Int;
       begin
          if SwitchOn then
             Err := Cbreak;
          else
             Err := NoCbreak;
          end if;
          if Err = Curses_Err then
             raise Curses_Exception;
          end if;
       end Set_Cbreak_Mode;

       procedure Set_Raw_Mode (SwitchOn : Boolean := True)
       is
          function Raw return C_Int;
          pragma Import (C, Raw, "raw");
          function NoRaw return C_Int;
          pragma Import (C, NoRaw, "noraw");

          Err : C_Int;
       begin
          if SwitchOn then
             Err := Raw;
          else
             Err := NoRaw;
          end if;
          if Err = Curses_Err then
             raise Curses_Exception;
          end if;
       end Set_Raw_Mode;

       procedure Set_Echo_Mode (SwitchOn : Boolean := True)
       is
          function Echo return C_Int;
          pragma Import (C, Echo, "echo");
          function NoEcho return C_Int;
          pragma Import (C, NoEcho, "noecho");

          Err : C_Int;
       begin
          if SwitchOn then
             Err := Echo;
          else
             Err := NoEcho;
          end if;
          if Err = Curses_Err then
             raise Curses_Exception;
          end if;
       end Set_Echo_Mode;

       procedure Set_Meta_Mode (Win      : Window := Standard_Window;
                                SwitchOn : Boolean := True)
       is
          function Meta (W : Window; Mode : Curses_Bool) return C_Int;
          pragma Import (C, Meta, "meta");
       begin
          if Meta (Win, Curses_Bool (Boolean'Pos (SwitchOn))) = Curses_Err then
             raise Curses_Exception;
          end if;
       end Set_Meta_Mode;

       procedure Set_KeyPad_Mode (Win      : Window := Standard_Window;
                                  SwitchOn : Boolean := True)
       is
          function Keypad (W : Window; Mode : Curses_Bool) return C_Int;
          pragma Import (C, Keypad, "keypad");
       begin
          if Keypad (Win, Curses_Bool (Boolean'Pos (SwitchOn))) = Curses_Err then
             raise Curses_Exception;
          end if;
       end Set_KeyPad_Mode;

       function Get_KeyPad_Mode (Win : Window := Standard_Window)
                                 return Boolean
       is
          function Is_Keypad (W : Window) return Curses_Bool;
          pragma Import (C, Is_Keypad, "is_keypad");
       begin
          return (Is_Keypad (Win) /= Curses_Bool_False);
       end Get_KeyPad_Mode;

       procedure Half_Delay (Amount : Half_Delay_Amount)
       is
          function Halfdelay (Amount : C_Int) return C_Int;
          pragma Import (C, Halfdelay, "halfdelay");
       begin
          if Halfdelay (C_Int (Amount)) = Curses_Err then
             raise Curses_Exception;
          end if;
       end Half_Delay;

       procedure Set_Flush_On_Interrupt_Mode
         (Win  : Window := Standard_Window;
          Mode : Boolean := True)
       is
          function Intrflush (Win : Window; Mode : Curses_Bool) return C_Int;
          pragma Import (C, Intrflush, "intrflush");
       begin
          if Intrflush (Win, Curses_Bool (Boolean'Pos (Mode))) = Curses_Err then
             raise Curses_Exception;
          end if;
       end Set_Flush_On_Interrupt_Mode;

       procedure Set_Queue_Interrupt_Mode
         (Win   : Window := Standard_Window;
          Flush : Boolean := True)
       is
          procedure Qiflush;
          pragma Import (C, Qiflush, "qiflush");
          procedure No_Qiflush;
          pragma Import (C, No_Qiflush, "noqiflush");
       begin
          if Win = Null_Window then
             raise Curses_Exception;
          end if;
          if Flush then
             Qiflush;
          else
             No_Qiflush;
          end if;
       end Set_Queue_Interrupt_Mode;

       procedure Set_NoDelay_Mode
         (Win  : Window := Standard_Window;
          Mode : Boolean := False)
       is
          function Nodelay (Win : Window; Mode : Curses_Bool) return C_Int;
          pragma Import (C, Nodelay, "nodelay");
       begin
          if Nodelay (Win, Curses_Bool (Boolean'Pos (Mode))) = Curses_Err then
             raise Curses_Exception;
          end if;
       end Set_NoDelay_Mode;

       procedure Set_Timeout_Mode (Win    : Window := Standard_Window;
                                   Mode   : Timeout_Mode;
                                   Amount : Natural)
       is
          procedure Wtimeout (Win : Window; Amount : C_Int);
          pragma Import (C, Wtimeout, "wtimeout");

          Time : C_Int;
       begin
          case Mode is
             when Blocking     => Time := -1;
             when Non_Blocking => Time := 0;
             when Delayed      =>
                if Amount = 0 then
                   raise Constraint_Error;
                end if;
                Time := C_Int (Amount);
          end case;
          Wtimeout (Win, Time);
       end Set_Timeout_Mode;

       procedure Set_Escape_Timer_Mode
         (Win       : Window := Standard_Window;
          Timer_Off : Boolean := False)
       is
          function Notimeout (Win : Window; Mode : Curses_Bool) return C_Int;
          pragma Import (C, Notimeout, "notimeout");
       begin
          if Notimeout (Win, Curses_Bool (Boolean'Pos (Timer_Off)))
            = Curses_Err
          then
             raise Curses_Exception;
          end if;
       end Set_Escape_Timer_Mode;

    ------------------------------------------------------------------------------
       procedure Set_NL_Mode (SwitchOn : Boolean := True)
       is
          function NL return C_Int;
          pragma Import (C, NL, "nl");
          function NoNL return C_Int;
          pragma Import (C, NoNL, "nonl");

          Err : C_Int;
       begin
          if SwitchOn then
             Err := NL;
          else
             Err := NoNL;
          end if;
          if Err = Curses_Err then
             raise Curses_Exception;
          end if;
       end Set_NL_Mode;

       procedure Clear_On_Next_Update
         (Win      : Window := Standard_Window;
          Do_Clear : Boolean := True)
       is
          function Clear_Ok (W : Window; Flag : Curses_Bool) return C_Int;
          pragma Import (C, Clear_Ok, "clearok");
       begin
          if Clear_Ok (Win, Curses_Bool (Boolean'Pos (Do_Clear))) = Curses_Err then
             raise Curses_Exception;
          end if;
       end Clear_On_Next_Update;

       procedure Use_Insert_Delete_Line
         (Win    : Window := Standard_Window;
          Do_Idl : Boolean := True)
       is
          function IDL_Ok (W : Window; Flag : Curses_Bool) return C_Int;
          pragma Import (C, IDL_Ok, "idlok");
       begin
          if IDL_Ok (Win, Curses_Bool (Boolean'Pos (Do_Idl))) = Curses_Err then
             raise Curses_Exception;
          end if;
       end Use_Insert_Delete_Line;

       procedure Use_Insert_Delete_Character
         (Win    : Window := Standard_Window;
          Do_Idc : Boolean := True)
       is
          procedure IDC_Ok (W : Window; Flag : Curses_Bool);
          pragma Import (C, IDC_Ok, "idcok");
       begin
          IDC_Ok (Win, Curses_Bool (Boolean'Pos (Do_Idc)));
       end Use_Insert_Delete_Character;

       procedure Leave_Cursor_After_Update
         (Win      : Window := Standard_Window;
          Do_Leave : Boolean := True)
       is
          function Leave_Ok (W : Window; Flag : Curses_Bool) return C_Int;
          pragma Import (C, Leave_Ok, "leaveok");
       begin
          if Leave_Ok (Win, Curses_Bool (Boolean'Pos (Do_Leave))) = Curses_Err then
             raise Curses_Exception;
          end if;
       end Leave_Cursor_After_Update;

       procedure Immediate_Update_Mode
         (Win  : Window := Standard_Window;
          Mode : Boolean := False)
       is
          procedure Immedok (Win : Window; Mode : Curses_Bool);
          pragma Import (C, Immedok, "immedok");
       begin
          Immedok (Win, Curses_Bool (Boolean'Pos (Mode)));
       end Immediate_Update_Mode;

       procedure Allow_Scrolling
         (Win  : Window  := Standard_Window;
          Mode : Boolean := False)
       is
          function Scrollok (Win : Window; Mode : Curses_Bool) return C_Int;
          pragma Import (C, Scrollok, "scrollok");
       begin
          if Scrollok (Win, Curses_Bool (Boolean'Pos (Mode))) = Curses_Err then
             raise Curses_Exception;
          end if;
       end Allow_Scrolling;

       function Scrolling_Allowed (Win : Window := Standard_Window)
                                   return Boolean
       is
          function Is_Scroll_Ok (W : Window) return Curses_Bool;
          pragma Import (C, Is_Scroll_Ok, "is_scrollok");
       begin
          return (Is_Scroll_Ok (Win) /= Curses_Bool_False);
       end Scrolling_Allowed;

       procedure Set_Scroll_Region
         (Win         : Window := Standard_Window;
          Top_Line    : Line_Position;
          Bottom_Line : Line_Position)
       is
          function Wsetscrreg (Win : Window;
                               Lin : C_Int;
                               Col : C_Int) return C_Int;
          pragma Import (C, Wsetscrreg, "wsetscrreg");
       begin
          if Wsetscrreg (Win, C_Int (Top_Line), C_Int (Bottom_Line))
            = Curses_Err
          then
             raise Curses_Exception;
          end if;
       end Set_Scroll_Region;
    ------------------------------------------------------------------------------
       procedure Update_Screen
       is
          function Do_Update return C_Int;
          pragma Import (C, Do_Update, "doupdate");
       begin
          if Do_Update = Curses_Err then
             raise Curses_Exception;
          end if;
       end Update_Screen;

       procedure Refresh (Win : Window := Standard_Window)
       is
          function Wrefresh (W : Window) return C_Int;
          pragma Import (C, Wrefresh, "wrefresh");
       begin
          if Wrefresh (Win) = Curses_Err then
             raise Curses_Exception;
          end if;
       end Refresh;

       procedure Refresh_Without_Update
         (Win : Window := Standard_Window)
       is
          function Wnoutrefresh (W : Window) return C_Int;
          pragma Import (C, Wnoutrefresh, "wnoutrefresh");
       begin
          if Wnoutrefresh (Win) = Curses_Err then
             raise Curses_Exception;
          end if;
       end Refresh_Without_Update;

       procedure Redraw (Win : Window := Standard_Window)
       is
          function Redrawwin (Win : Window) return C_Int;
          pragma Import (C, Redrawwin, "redrawwin");
       begin
          if Redrawwin (Win) = Curses_Err then
             raise Curses_Exception;
          end if;
       end Redraw;

       procedure Redraw
         (Win        : Window := Standard_Window;
          Begin_Line : Line_Position;
          Line_Count : Positive)
       is
          function Wredrawln (Win : Window; First : C_Int; Cnt : C_Int)
                              return C_Int;
          pragma Import (C, Wredrawln, "wredrawln");
       begin
          if Wredrawln (Win,
                        C_Int (Begin_Line),
                        C_Int (Line_Count)) = Curses_Err
          then
             raise Curses_Exception;
          end if;
       end Redraw;

    ------------------------------------------------------------------------------
       procedure Erase (Win : Window := Standard_Window)
       is
          function Werase (W : Window) return C_Int;
          pragma Import (C, Werase, "werase");
       begin
          if Werase (Win) = Curses_Err then
             raise Curses_Exception;
          end if;
       end Erase;

       procedure Clear (Win : Window := Standard_Window)
       is
          function Wclear (W : Window) return C_Int;
          pragma Import (C, Wclear, "wclear");
       begin
          if Wclear (Win) = Curses_Err then
             raise Curses_Exception;
          end if;
       end Clear;

       procedure Clear_To_End_Of_Screen (Win : Window := Standard_Window)
       is
          function Wclearbot (W : Window) return C_Int;
          pragma Import (C, Wclearbot, "wclrtobot");
       begin
          if Wclearbot (Win) = Curses_Err then
             raise Curses_Exception;
          end if;
       end Clear_To_End_Of_Screen;

       procedure Clear_To_End_Of_Line (Win : Window := Standard_Window)
       is
          function Wcleareol (W : Window) return C_Int;
          pragma Import (C, Wcleareol, "wclrtoeol");
       begin
          if Wcleareol (Win) = Curses_Err then
             raise Curses_Exception;
          end if;
       end Clear_To_End_Of_Line;
    ------------------------------------------------------------------------------
       procedure Set_Background
         (Win : Window := Standard_Window;
          Ch  : Attributed_Character)
       is
          procedure WBackground (W : Window; Ch : Attributed_Character);
          pragma Import (C, WBackground, "wbkgdset");
       begin
          WBackground (Win, Ch);
       end Set_Background;

       procedure Change_Background
         (Win : Window := Standard_Window;
          Ch  : Attributed_Character)
       is
          function WChangeBkgd (W : Window; Ch : Attributed_Character)
             return C_Int;
          pragma Import (C, WChangeBkgd, "wbkgd");
       begin
          if WChangeBkgd (Win, Ch) = Curses_Err then
             raise Curses_Exception;
          end if;
       end Change_Background;

       function Get_Background (Win : Window := Standard_Window)
         return Attributed_Character
       is
          function Wgetbkgd (Win : Window) return Attributed_Character;
          pragma Import (C, Wgetbkgd, "getbkgd");
       begin
          return Wgetbkgd (Win);
       end Get_Background;
    ------------------------------------------------------------------------------
       procedure Change_Lines_Status (Win   : Window := Standard_Window;
                                      Start : Line_Position;
                                      Count : Positive;
                                      State : Boolean)
       is
          function Wtouchln (Win : Window;
                             Sta : C_Int;
                             Cnt : C_Int;
                             Chg : C_Int) return C_Int;
          pragma Import (C, Wtouchln, "wtouchln");
       begin
          if Wtouchln (Win, C_Int (Start), C_Int (Count),
                       C_Int (Boolean'Pos (State))) = Curses_Err
          then
             raise Curses_Exception;
          end if;
       end Change_Lines_Status;

       procedure Touch (Win : Window := Standard_Window)
       is
          Y : Line_Position;
          X : Column_Position;
       begin
          Get_Size (Win, Y, X);
          pragma Warnings (Off, X);         --  unreferenced
          Change_Lines_Status (Win, 0, Positive (Y), True);
       end Touch;

       procedure Untouch (Win : Window := Standard_Window)
       is
          Y : Line_Position;
          X : Column_Position;
       begin
          Get_Size (Win, Y, X);
          pragma Warnings (Off, X);         --  unreferenced
          Change_Lines_Status (Win, 0, Positive (Y), False);
       end Untouch;

       procedure Touch (Win   : Window := Standard_Window;
                        Start : Line_Position;
                        Count : Positive)
       is
       begin
          Change_Lines_Status (Win, Start, Count, True);
       end Touch;

       function Is_Touched
         (Win  : Window := Standard_Window;
          Line : Line_Position) return Boolean
       is
          function WLineTouched (W : Window; L : C_Int) return Curses_Bool;
          pragma Import (C, WLineTouched, "is_linetouched");
       begin
          if WLineTouched (Win, C_Int (Line)) = Curses_Bool_False then
             return False;
          else
             return True;
          end if;
       end Is_Touched;

       function Is_Touched
         (Win : Window := Standard_Window) return Boolean
       is
          function WWinTouched (W : Window) return Curses_Bool;
          pragma Import (C, WWinTouched, "is_wintouched");
       begin
          if WWinTouched (Win) = Curses_Bool_False then
             return False;
          else
             return True;
          end if;
       end Is_Touched;
    ------------------------------------------------------------------------------
       procedure Copy
         (Source_Window            : Window;
          Destination_Window       : Window;
          Source_Top_Row           : Line_Position;
          Source_Left_Column       : Column_Position;
          Destination_Top_Row      : Line_Position;
          Destination_Left_Column  : Column_Position;
          Destination_Bottom_Row   : Line_Position;
          Destination_Right_Column : Column_Position;
          Non_Destructive_Mode     : Boolean := True)
       is
          function Copywin (Src : Window;
                            Dst : Window;
                            Str : C_Int;
                            Slc : C_Int;
                            Dtr : C_Int;
                            Dlc : C_Int;
                            Dbr : C_Int;
                            Drc : C_Int;
                            Ndm : C_Int) return C_Int;
          pragma Import (C, Copywin, "copywin");
       begin
          if Copywin (Source_Window,
                      Destination_Window,
                      C_Int (Source_Top_Row),
                      C_Int (Source_Left_Column),
                      C_Int (Destination_Top_Row),
                      C_Int (Destination_Left_Column),
                      C_Int (Destination_Bottom_Row),
                      C_Int (Destination_Right_Column),
                      Boolean'Pos (Non_Destructive_Mode)
                     ) = Curses_Err
          then
             raise Curses_Exception;
          end if;
       end Copy;

       procedure Overwrite
         (Source_Window      : Window;
          Destination_Window : Window)
       is
          function Overwrite (Src : Window; Dst : Window) return C_Int;
          pragma Import (C, Overwrite, "overwrite");
       begin
          if Overwrite (Source_Window, Destination_Window) = Curses_Err then
             raise Curses_Exception;
          end if;
       end Overwrite;

       procedure Overlay
         (Source_Window      : Window;
          Destination_Window : Window)
       is
          function Overlay (Src : Window; Dst : Window) return C_Int;
          pragma Import (C, Overlay, "overlay");
       begin
          if Overlay (Source_Window, Destination_Window) = Curses_Err then
             raise Curses_Exception;
          end if;
       end Overlay;

    ------------------------------------------------------------------------------
       procedure Insert_Delete_Lines
         (Win   : Window := Standard_Window;
          Lines : Integer       := 1) -- default is to insert one line above
       is
          function Winsdelln (W : Window; N : C_Int) return C_Int;
          pragma Import (C, Winsdelln, "winsdelln");
       begin
          if Winsdelln (Win, C_Int (Lines)) = Curses_Err then
             raise Curses_Exception;
          end if;
       end Insert_Delete_Lines;

       procedure Delete_Line (Win : Window := Standard_Window)
       is
       begin
          Insert_Delete_Lines (Win, -1);
       end Delete_Line;

       procedure Insert_Line (Win : Window := Standard_Window)
       is
       begin
          Insert_Delete_Lines (Win, 1);
       end Insert_Line;
    ------------------------------------------------------------------------------

       procedure Get_Size
         (Win               : Window := Standard_Window;
          Number_Of_Lines   : out Line_Count;
          Number_Of_Columns : out Column_Count)
       is
          function GetMaxY (W : Window) return C_Int;
          pragma Import (C, GetMaxY, "getmaxy");

          function GetMaxX (W : Window) return C_Int;
          pragma Import (C, GetMaxX, "getmaxx");

          Y : constant C_Int := GetMaxY (Win);
          X : constant C_Int := GetMaxX (Win);
       begin
          Number_Of_Lines   := Line_Count (Y);
          Number_Of_Columns := Column_Count (X);
       end Get_Size;

       procedure Get_Window_Position
         (Win             : Window := Standard_Window;
          Top_Left_Line   : out Line_Position;
          Top_Left_Column : out Column_Position)
       is
          function GetBegY (W : Window) return C_Int;
          pragma Import (C, GetBegY, "getbegy");

          function GetBegX (W : Window) return C_Int;
          pragma Import (C, GetBegX, "getbegx");

          Y : constant C_Short := C_Short (GetBegY (Win));
          X : constant C_Short := C_Short (GetBegX (Win));
       begin
          Top_Left_Line   := Line_Position (Y);
          Top_Left_Column := Column_Position (X);
       end Get_Window_Position;

       procedure Get_Cursor_Position
         (Win    :  Window := Standard_Window;
          Line   : out Line_Position;
          Column : out Column_Position)
       is
          function GetCurY (W : Window) return C_Int;
          pragma Import (C, GetCurY, "getcury");

          function GetCurX (W : Window) return C_Int;
          pragma Import (C, GetCurX, "getcurx");

          Y : constant C_Short := C_Short (GetCurY (Win));
          X : constant C_Short := C_Short (GetCurX (Win));
       begin
          Line   := Line_Position (Y);
          Column := Column_Position (X);
       end Get_Cursor_Position;

       procedure Get_Origin_Relative_To_Parent
         (Win                :  Window;
          Top_Left_Line      : out Line_Position;
          Top_Left_Column    : out Column_Position;
          Is_Not_A_Subwindow : out Boolean)
       is
          function GetParY (W : Window) return C_Int;
          pragma Import (C, GetParY, "getpary");

          function GetParX (W : Window) return C_Int;
          pragma Import (C, GetParX, "getparx");

          Y : constant C_Int := GetParY (Win);
          X : constant C_Int := GetParX (Win);
       begin
          if Y = -1 then
             Top_Left_Line   := Line_Position'Last;
             Top_Left_Column := Column_Position'Last;
             Is_Not_A_Subwindow := True;
          else
             Top_Left_Line   := Line_Position (Y);
             Top_Left_Column := Column_Position (X);
             Is_Not_A_Subwindow := False;
          end if;
       end Get_Origin_Relative_To_Parent;
    ------------------------------------------------------------------------------
       function New_Pad (Lines   : Line_Count;
                         Columns : Column_Count) return Window
       is
          function Newpad (Lines : C_Int; Columns : C_Int) return Window;
          pragma Import (C, Newpad, "newpad");

          W : Window;
       begin
          W := Newpad (C_Int (Lines), C_Int (Columns));
          if W = Null_Window then
             raise Curses_Exception;
          end if;
          return W;
       end New_Pad;

       function Sub_Pad
         (Pad                   : Window;
          Number_Of_Lines       : Line_Count;
          Number_Of_Columns     : Column_Count;
          First_Line_Position   : Line_Position;
          First_Column_Position : Column_Position) return Window
       is
          function Subpad
            (Pad                   : Window;
             Number_Of_Lines       : C_Int;
             Number_Of_Columns     : C_Int;
             First_Line_Position   : C_Int;
             First_Column_Position : C_Int) return Window;
          pragma Import (C, Subpad, "subpad");

          W : Window;
       begin
          W := Subpad (Pad,
                       C_Int (Number_Of_Lines),
                       C_Int (Number_Of_Columns),
                       C_Int (First_Line_Position),
                       C_Int (First_Column_Position));
          if W = Null_Window then
             raise Curses_Exception;
          end if;
          return W;
       end Sub_Pad;

       procedure Refresh
         (Pad                      : Window;
          Source_Top_Row           : Line_Position;
          Source_Left_Column       : Column_Position;
          Destination_Top_Row      : Line_Position;
          Destination_Left_Column  : Column_Position;
          Destination_Bottom_Row   : Line_Position;
          Destination_Right_Column : Column_Position)
       is
          function Prefresh
            (Pad                      : Window;
             Source_Top_Row           : C_Int;
             Source_Left_Column       : C_Int;
             Destination_Top_Row      : C_Int;
             Destination_Left_Column  : C_Int;
             Destination_Bottom_Row   : C_Int;
             Destination_Right_Column : C_Int) return C_Int;
          pragma Import (C, Prefresh, "prefresh");
       begin
          if Prefresh (Pad,
                       C_Int (Source_Top_Row),
                       C_Int (Source_Left_Column),
                       C_Int (Destination_Top_Row),
                       C_Int (Destination_Left_Column),
                       C_Int (Destination_Bottom_Row),
                       C_Int (Destination_Right_Column)) = Curses_Err
          then
             raise Curses_Exception;
          end if;
       end Refresh;

       procedure Refresh_Without_Update
         (Pad                      : Window;
          Source_Top_Row           : Line_Position;
          Source_Left_Column       : Column_Position;
          Destination_Top_Row      : Line_Position;
          Destination_Left_Column  : Column_Position;
          Destination_Bottom_Row   : Line_Position;
          Destination_Right_Column : Column_Position)
       is
          function Pnoutrefresh
            (Pad                      : Window;
             Source_Top_Row           : C_Int;
             Source_Left_Column       : C_Int;
             Destination_Top_Row      : C_Int;
             Destination_Left_Column  : C_Int;
             Destination_Bottom_Row   : C_Int;
             Destination_Right_Column : C_Int) return C_Int;
          pragma Import (C, Pnoutrefresh, "pnoutrefresh");
       begin
          if Pnoutrefresh (Pad,
                           C_Int (Source_Top_Row),
                           C_Int (Source_Left_Column),
                           C_Int (Destination_Top_Row),
                           C_Int (Destination_Left_Column),
                           C_Int (Destination_Bottom_Row),
                           C_Int (Destination_Right_Column)) = Curses_Err
          then
             raise Curses_Exception;
          end if;
       end Refresh_Without_Update;

       procedure Add_Character_To_Pad_And_Echo_It
         (Pad : Window;
          Ch  : Attributed_Character)
       is
          function Pechochar (Pad : Window; Ch : Attributed_Character)
                              return C_Int;
          pragma Import (C, Pechochar, "pechochar");
       begin
          if Pechochar (Pad, Ch) = Curses_Err then
             raise Curses_Exception;
          end if;
       end Add_Character_To_Pad_And_Echo_It;

       procedure Add_Character_To_Pad_And_Echo_It
         (Pad : Window;
          Ch  : Character)
       is
       begin
          Add_Character_To_Pad_And_Echo_It
            (Pad,
             Attributed_Character'(Ch    => Ch,
                                   Color => Color_Pair'First,
                                   Attr  => Normal_Video));
       end Add_Character_To_Pad_And_Echo_It;
    ------------------------------------------------------------------------------
       procedure Scroll (Win    : Window := Standard_Window;
                         Amount : Integer := 1)
       is
          function Wscrl (Win : Window; N : C_Int) return C_Int;
          pragma Import (C, Wscrl, "wscrl");

       begin
          if Wscrl (Win, C_Int (Amount)) = Curses_Err then
             raise Curses_Exception;
          end if;
       end Scroll;

    ------------------------------------------------------------------------------
       procedure Delete_Character (Win : Window := Standard_Window)
       is
          function Wdelch (Win : Window) return C_Int;
          pragma Import (C, Wdelch, "wdelch");
       begin
          if Wdelch (Win) = Curses_Err then
             raise Curses_Exception;
          end if;
       end Delete_Character;

       procedure Delete_Character
         (Win    : Window := Standard_Window;
          Line   : Line_Position;
          Column : Column_Position)
       is
          function Mvwdelch (Win : Window;
                             Lin : C_Int;
                             Col : C_Int) return C_Int;
          pragma Import (C, Mvwdelch, "mvwdelch");
       begin
          if Mvwdelch (Win, C_Int (Line), C_Int (Column)) = Curses_Err then
             raise Curses_Exception;
          end if;
       end Delete_Character;
    ------------------------------------------------------------------------------
       function Peek (Win : Window := Standard_Window)
         return Attributed_Character
       is
          function Winch (Win : Window) return Attributed_Character;
          pragma Import (C, Winch, "winch");
       begin
          return Winch (Win);
       end Peek;

       function Peek
         (Win    : Window := Standard_Window;
          Line   : Line_Position;
          Column : Column_Position) return Attributed_Character
       is
          function Mvwinch (Win : Window;
                            Lin : C_Int;
                            Col : C_Int) return Attributed_Character;
          pragma Import (C, Mvwinch, "mvwinch");
       begin
          return Mvwinch (Win, C_Int (Line), C_Int (Column));
       end Peek;
    ------------------------------------------------------------------------------
       procedure Insert (Win : Window := Standard_Window;
                         Ch  : Attributed_Character)
       is
          function Winsch (Win : Window; Ch : Attributed_Character) return C_Int;
          pragma Import (C, Winsch, "winsch");
       begin
          if Winsch (Win, Ch) = Curses_Err then
             raise Curses_Exception;
          end if;
       end Insert;

       procedure Insert
         (Win    : Window := Standard_Window;
          Line   : Line_Position;
          Column : Column_Position;
          Ch     : Attributed_Character)
       is
          function Mvwinsch (Win : Window;
                             Lin : C_Int;
                             Col : C_Int;
                             Ch  : Attributed_Character) return C_Int;
          pragma Import (C, Mvwinsch, "mvwinsch");
       begin
          if Mvwinsch (Win,
                       C_Int (Line),
                       C_Int (Column),
                       Ch) = Curses_Err
          then
             raise Curses_Exception;
          end if;
       end Insert;
    ------------------------------------------------------------------------------
       procedure Insert (Win : Window := Standard_Window;
                         Str : String;
                         Len : Integer := -1)
       is
          function Winsnstr (Win : Window;
                             Str : char_array;
                             Len : Integer := -1) return C_Int;
          pragma Import (C, Winsnstr, "winsnstr");

          Txt    : char_array (0 .. Str'Length);
          Length : size_t;
       begin
          To_C (Str, Txt, Length);
          if Winsnstr (Win, Txt, Len) = Curses_Err then
             raise Curses_Exception;
          end if;
       end Insert;

       procedure Insert
         (Win    : Window := Standard_Window;
          Line   : Line_Position;
          Column : Column_Position;
          Str    : String;
          Len    : Integer := -1)
       is
          function Mvwinsnstr (Win    : Window;
                               Line   : C_Int;
                               Column : C_Int;
                               Str    : char_array;
                               Len    : C_Int) return C_Int;
          pragma Import (C, Mvwinsnstr, "mvwinsnstr");

          Txt    : char_array (0 .. Str'Length);
          Length : size_t;
       begin
          To_C (Str, Txt, Length);
          if Mvwinsnstr (Win, C_Int (Line), C_Int (Column), Txt, C_Int (Len))
            = Curses_Err
          then
             raise Curses_Exception;
          end if;
       end Insert;
    ------------------------------------------------------------------------------
       procedure Peek (Win :  Window := Standard_Window;
                       Str : out String;
                       Len :  Integer := -1)
       is
          function Winnstr (Win : Window;
                            Str : char_array;
                            Len : C_Int) return C_Int;
          pragma Import (C, Winnstr, "winnstr");

          N   : Integer := Len;
          Txt : char_array (0 .. Str'Length);
          Cnt : Natural;
       begin
          if N < 0 then
             N := Str'Length;
          end if;
          if N > Str'Length then
             raise Constraint_Error;
          end if;
          Txt (0) := Interfaces.C.char'First;
          if Winnstr (Win, Txt, C_Int (N)) = Curses_Err then
             raise Curses_Exception;
          end if;
          To_Ada (Txt, Str, Cnt, True);
          if Cnt < Str'Length then
             Str ((Str'First + Cnt) .. Str'Last) := (others => ' ');
          end if;
       end Peek;

       procedure Peek
         (Win    :  Window := Standard_Window;
          Line   :  Line_Position;
          Column :  Column_Position;
          Str    : out String;
          Len    :  Integer := -1)
       is
       begin
          Move_Cursor (Win, Line, Column);
          Peek (Win, Str, Len);
       end Peek;
    ------------------------------------------------------------------------------
       procedure Peek
         (Win :  Window := Standard_Window;
          Str : out Attributed_String;
          Len :  Integer := -1)
       is
          function Winchnstr (Win : Window;
                              Str : chtype_array;             -- out
                              Len : C_Int) return C_Int;
          pragma Import (C, Winchnstr, "winchnstr");

          N   : Integer := Len;
          Txt : constant chtype_array (0 .. Str'Length)
              := (0 => Default_Character);
          Cnt : Natural := 0;
       begin
          if N < 0 then
             N := Str'Length;
          end if;
          if N > Str'Length then
             raise Constraint_Error;
          end if;
          if Winchnstr (Win, Txt, C_Int (N)) = Curses_Err then
             raise Curses_Exception;
          end if;
          for To in Str'Range loop
             exit when Txt (size_t (Cnt)) = Default_Character;
             Str (To) := Txt (size_t (Cnt));
             Cnt := Cnt + 1;
          end loop;
          if Cnt < Str'Length then
             Str ((Str'First + Cnt) .. Str'Last) :=
               (others => (Ch => ' ',
                           Color => Color_Pair'First,
                           Attr => Normal_Video));
          end if;
       end Peek;

       procedure Peek
         (Win    :  Window := Standard_Window;
          Line   :  Line_Position;
          Column :  Column_Position;
          Str    : out Attributed_String;
          Len    : Integer := -1)
       is
       begin
          Move_Cursor (Win, Line, Column);
          Peek (Win, Str, Len);
       end Peek;
    ------------------------------------------------------------------------------
       procedure Get (Win :  Window := Standard_Window;
                      Str : out String;
                      Len :  Integer := -1)
       is
          function Wgetnstr (Win : Window;
                             Str : char_array;
                             Len : C_Int) return C_Int;
          pragma Import (C, Wgetnstr, "wgetnstr");

          N   : Integer := Len;
          Txt : char_array (0 .. Str'Length);
          Cnt : Natural;
       begin
          if N < 0 then
             N := Str'Length;
          end if;
          if N > Str'Length then
             raise Constraint_Error;
          end if;
          Txt (0) := Interfaces.C.char'First;
          if Wgetnstr (Win, Txt, C_Int (N)) = Curses_Err then
             raise Curses_Exception;
          end if;
          To_Ada (Txt, Str, Cnt, True);
          if Cnt < Str'Length then
             Str ((Str'First + Cnt) .. Str'Last) := (others => ' ');
          end if;
       end Get;

       procedure Get
         (Win    :  Window := Standard_Window;
          Line   :  Line_Position;
          Column :  Column_Position;
          Str    : out String;
          Len    :  Integer := -1)
       is
       begin
          Move_Cursor (Win, Line, Column);
          Get (Win, Str, Len);
       end Get;
    ------------------------------------------------------------------------------
       procedure Init_Soft_Label_Keys
         (Format : Soft_Label_Key_Format := Three_Two_Three)
       is
          function Slk_Init (Fmt : C_Int) return C_Int;
          pragma Import (C, Slk_Init, "slk_init");
       begin
          if Slk_Init (Soft_Label_Key_Format'Pos (Format)) = Curses_Err then
             raise Curses_Exception;
          end if;
       end Init_Soft_Label_Keys;

       procedure Set_Soft_Label_Key (Label : Label_Number;
                                     Text  : String;
                                     Fmt   : Label_Justification := Left)
       is
          function Slk_Set (Label : C_Int;
                            Txt   : char_array;
                            Fmt   : C_Int) return C_Int;
          pragma Import (C, Slk_Set, "slk_set");

          Txt : char_array (0 .. Text'Length);
          Len : size_t;
       begin
          To_C (Text, Txt, Len);
          if Slk_Set (C_Int (Label), Txt,
                      C_Int (Label_Justification'Pos (Fmt))) = Curses_Err
          then
             raise Curses_Exception;
          end if;
       end Set_Soft_Label_Key;

       procedure Refresh_Soft_Label_Keys
       is
          function Slk_Refresh return C_Int;
          pragma Import (C, Slk_Refresh, "slk_refresh");
       begin
          if Slk_Refresh = Curses_Err then
             raise Curses_Exception;
          end if;
       end Refresh_Soft_Label_Keys;

       procedure Refresh_Soft_Label_Keys_Without_Update
       is
          function Slk_Noutrefresh return C_Int;
          pragma Import (C, Slk_Noutrefresh, "slk_noutrefresh");
       begin
          if Slk_Noutrefresh = Curses_Err then
             raise Curses_Exception;
          end if;
       end Refresh_Soft_Label_Keys_Without_Update;

       procedure Get_Soft_Label_Key (Label : Label_Number;
                                     Text  : out String)
       is
          function Slk_Label (Label : C_Int) return chars_ptr;
          pragma Import (C, Slk_Label, "slk_label");
       begin
          Fill_String (Slk_Label (C_Int (Label)), Text);
       end Get_Soft_Label_Key;

       function Get_Soft_Label_Key (Label : Label_Number) return String
       is
          function Slk_Label (Label : C_Int) return chars_ptr;
          pragma Import (C, Slk_Label, "slk_label");
       begin
          return Fill_String (Slk_Label (C_Int (Label)));
       end Get_Soft_Label_Key;

       procedure Clear_Soft_Label_Keys
       is
          function Slk_Clear return C_Int;
          pragma Import (C, Slk_Clear, "slk_clear");
       begin
          if Slk_Clear = Curses_Err then
             raise Curses_Exception;
          end if;
       end Clear_Soft_Label_Keys;

       procedure Restore_Soft_Label_Keys
       is
          function Slk_Restore return C_Int;
          pragma Import (C, Slk_Restore, "slk_restore");
       begin
          if Slk_Restore = Curses_Err then
             raise Curses_Exception;
          end if;
       end Restore_Soft_Label_Keys;

       procedure Touch_Soft_Label_Keys
       is
          function Slk_Touch return C_Int;
          pragma Import (C, Slk_Touch, "slk_touch");
       begin
          if Slk_Touch = Curses_Err then
             raise Curses_Exception;
          end if;
       end Touch_Soft_Label_Keys;

       procedure Switch_Soft_Label_Key_Attributes
         (Attr : Character_Attribute_Set;
          On   : Boolean := True)
       is
          function Slk_Attron (Ch : Attributed_Character) return C_Int;
          pragma Import (C, Slk_Attron, "slk_attron");
          function Slk_Attroff (Ch : Attributed_Character) return C_Int;
          pragma Import (C, Slk_Attroff, "slk_attroff");

          Err : C_Int;
          Ch  : constant Attributed_Character := (Ch    => Character'First,
                                                  Attr  => Attr,
                                                  Color => Color_Pair'First);
       begin
          if On then
             Err := Slk_Attron  (Ch);
          else
             Err := Slk_Attroff (Ch);
          end if;
          if Err = Curses_Err then
             raise Curses_Exception;
          end if;
       end Switch_Soft_Label_Key_Attributes;

       procedure Set_Soft_Label_Key_Attributes
         (Attr  : Character_Attribute_Set := Normal_Video;
          Color : Color_Pair := Color_Pair'First)
       is
          function Slk_Attrset (Ch : Attributed_Character) return C_Int;
          pragma Import (C, Slk_Attrset, "slk_attrset");

          Ch : constant Attributed_Character := (Ch    => Character'First,
                                                 Attr  => Attr,
                                                 Color => Color);
       begin
          if Slk_Attrset (Ch) = Curses_Err then
             raise Curses_Exception;
          end if;
       end Set_Soft_Label_Key_Attributes;

       function Get_Soft_Label_Key_Attributes return Character_Attribute_Set
       is
          function Slk_Attr return Attributed_Character;
          pragma Import (C, Slk_Attr, "slk_attr");

          Attr : constant Attributed_Character := Slk_Attr;
       begin
          return Attr.Attr;
       end Get_Soft_Label_Key_Attributes;

       function Get_Soft_Label_Key_Attributes return Color_Pair
       is
          function Slk_Attr return Attributed_Character;
          pragma Import (C, Slk_Attr, "slk_attr");

          Attr : constant Attributed_Character := Slk_Attr;
       begin
          return Attr.Color;
       end Get_Soft_Label_Key_Attributes;

       procedure Set_Soft_Label_Key_Color (Pair : Color_Pair)
       is
          function Slk_Color (Color : C_Short) return C_Int;
          pragma Import (C, Slk_Color, "slk_color");
       begin
          if Slk_Color (C_Short (Pair)) = Curses_Err then
             raise Curses_Exception;
          end if;
       end Set_Soft_Label_Key_Color;

    ------------------------------------------------------------------------------
       procedure Enable_Key (Key    : Special_Key_Code;
                             Enable : Boolean := True)
       is
          function Keyok (Keycode : C_Int;
                          On_Off  : Curses_Bool) return C_Int;
          pragma Import (C, Keyok, "keyok");
       begin
          if Keyok (C_Int (Key), Curses_Bool (Boolean'Pos (Enable)))
            = Curses_Err
          then
             raise Curses_Exception;
          end if;
       end Enable_Key;
    ------------------------------------------------------------------------------
       procedure Define_Key (Definition : String;
                             Key        : Special_Key_Code)
       is
          function Defkey (Def : char_array;
                           Key : C_Int) return C_Int;
          pragma Import (C, Defkey, "define_key");

          Txt    : char_array (0 .. Definition'Length);
          Length : size_t;
       begin
          To_C (Definition, Txt, Length);
          if Defkey (Txt, C_Int (Key)) = Curses_Err then
             raise Curses_Exception;
          end if;
       end Define_Key;
    ------------------------------------------------------------------------------
       procedure Un_Control (Ch  : Attributed_Character;
                             Str : out String)
       is
          function Unctrl (Ch : Attributed_Character) return chars_ptr;
          pragma Import (C, Unctrl, "unctrl");
       begin
          Fill_String (Unctrl (Ch), Str);
       end Un_Control;

       function Un_Control (Ch : Attributed_Character) return String
       is
          function Unctrl (Ch : Attributed_Character) return chars_ptr;
          pragma Import (C, Unctrl, "unctrl");
       begin
          return Fill_String (Unctrl (Ch));
       end Un_Control;

       procedure Delay_Output (Msecs : Natural)
       is
          function Delayoutput (Msecs : C_Int) return C_Int;
          pragma Import (C, Delayoutput, "delay_output");
       begin
          if Delayoutput (C_Int (Msecs)) = Curses_Err then
             raise Curses_Exception;
          end if;
       end Delay_Output;

       procedure Flush_Input
       is
          function Flushinp return C_Int;
          pragma Import (C, Flushinp, "flushinp");
       begin
          if Flushinp = Curses_Err then  -- docu says that never happens, but...
             raise Curses_Exception;
          end if;
       end Flush_Input;
    ------------------------------------------------------------------------------
       function Baudrate return Natural
       is
          function Baud return C_Int;
          pragma Import (C, Baud, "baudrate");
       begin
          return Natural (Baud);
       end Baudrate;

       function Erase_Character return Character
       is
          function Erasechar return C_Int;
          pragma Import (C, Erasechar, "erasechar");
       begin
          return Character'Val (Erasechar);
       end Erase_Character;

       function Kill_Character return Character
       is
          function Killchar return C_Int;
          pragma Import (C, Killchar, "killchar");
       begin
          return Character'Val (Killchar);
       end Kill_Character;

       function Has_Insert_Character return Boolean
       is
          function Has_Ic return Curses_Bool;
          pragma Import (C, Has_Ic, "has_ic");
       begin
          if Has_Ic = Curses_Bool_False then
             return False;
          else
             return True;
          end if;
       end Has_Insert_Character;

       function Has_Insert_Line return Boolean
       is
          function Has_Il return Curses_Bool;
          pragma Import (C, Has_Il, "has_il");
       begin
          if Has_Il = Curses_Bool_False then
             return False;
          else
             return True;
          end if;
       end Has_Insert_Line;

       function Supported_Attributes return Character_Attribute_Set
       is
          function Termattrs return Attributed_Character;
          pragma Import (C, Termattrs, "termattrs");

          Ch : constant Attributed_Character := Termattrs;
       begin
          return Ch.Attr;
       end Supported_Attributes;

       procedure Long_Name (Name : out String)
       is
          function Longname return chars_ptr;
          pragma Import (C, Longname, "longname");
       begin
          Fill_String (Longname, Name);
       end Long_Name;

       function Long_Name return String
       is
          function Longname return chars_ptr;
          pragma Import (C, Longname, "longname");
       begin
          return Fill_String (Longname);
       end Long_Name;

       procedure Terminal_Name (Name : out String)
       is
          function Termname return chars_ptr;
          pragma Import (C, Termname, "termname");
       begin
          Fill_String (Termname, Name);
       end Terminal_Name;

       function Terminal_Name return String
       is
          function Termname return chars_ptr;
          pragma Import (C, Termname, "termname");
       begin
          return Fill_String (Termname);
       end Terminal_Name;
    ------------------------------------------------------------------------------
       procedure Init_Pair (Pair : Redefinable_Color_Pair;
                            Fore : Color_Number;
                            Back : Color_Number)
       is
          function Initpair (Pair : C_Short;
                             Fore : C_Short;
                             Back : C_Short) return C_Int;
          pragma Import (C, Initpair, "init_pair");
       begin
          if Integer (Pair) >= Number_Of_Color_Pairs then
             raise Constraint_Error;
          end if;
          if Integer (Fore) >= Number_Of_Colors or else
             Integer (Back) >= Number_Of_Colors
          then
             raise Constraint_Error;
          end if;
          if Initpair (C_Short (Pair), C_Short (Fore), C_Short (Back))
            = Curses_Err
          then
             raise Curses_Exception;
          end if;
       end Init_Pair;

       procedure Pair_Content (Pair : Color_Pair;
                               Fore : out Color_Number;
                               Back : out Color_Number)
       is
          type C_Short_Access is access all C_Short;
          function Paircontent (Pair : C_Short;
                                Fp   : C_Short_Access;
                                Bp   : C_Short_Access) return C_Int;
          pragma Import (C, Paircontent, "pair_content");

          F, B : aliased C_Short;
       begin
          if Paircontent (C_Short (Pair), F'Access, B'Access) = Curses_Err then
             raise Curses_Exception;
          else
             Fore := Color_Number (F);
             Back := Color_Number (B);
          end if;
       end Pair_Content;

       function Has_Colors return Boolean
       is
          function Hascolors return Curses_Bool;
          pragma Import (C, Hascolors, "has_colors");
       begin
          if Hascolors = Curses_Bool_False then
             return False;
          else
             return True;
          end if;
       end Has_Colors;

       procedure Init_Color (Color : Color_Number;
                             Red   : RGB_Value;
                             Green : RGB_Value;
                             Blue  : RGB_Value)
       is
          function Initcolor (Col   : C_Short;
                              Red   : C_Short;
                              Green : C_Short;
                              Blue  : C_Short) return C_Int;
          pragma Import (C, Initcolor, "init_color");
       begin
          if Initcolor (C_Short (Color), C_Short (Red), C_Short (Green),
                        C_Short (Blue)) = Curses_Err
          then
                raise Curses_Exception;
          end if;
       end Init_Color;

       function Can_Change_Color return Boolean
       is
          function Canchangecolor return Curses_Bool;
          pragma Import (C, Canchangecolor, "can_change_color");
       begin
          if Canchangecolor = Curses_Bool_False then
             return False;
          else
             return True;
          end if;
       end Can_Change_Color;

       procedure Color_Content (Color :  Color_Number;
                                Red   : out RGB_Value;
                                Green : out RGB_Value;
                                Blue  : out RGB_Value)
       is
          type C_Short_Access is access all C_Short;

          function Colorcontent (Color : C_Short; R, G, B : C_Short_Access)
                                 return C_Int;
          pragma Import (C, Colorcontent, "color_content");

          R, G, B : aliased C_Short;
       begin
          if Colorcontent (C_Short (Color), R'Access, G'Access, B'Access) =
            Curses_Err
          then
             raise Curses_Exception;
          else
             Red   := RGB_Value (R);
             Green := RGB_Value (G);
             Blue  := RGB_Value (B);
          end if;
       end Color_Content;

    ------------------------------------------------------------------------------
       procedure Save_Curses_Mode (Mode : Curses_Mode)
       is
          function Def_Prog_Mode return C_Int;
          pragma Import (C, Def_Prog_Mode, "def_prog_mode");
          function Def_Shell_Mode return C_Int;
          pragma Import (C, Def_Shell_Mode, "def_shell_mode");

          Err : C_Int;
       begin
          case Mode is
             when Curses => Err := Def_Prog_Mode;
             when Shell  => Err := Def_Shell_Mode;
          end case;
          if Err = Curses_Err then
             raise Curses_Exception;
          end if;
       end Save_Curses_Mode;

       procedure Reset_Curses_Mode (Mode : Curses_Mode)
       is
          function Reset_Prog_Mode return C_Int;
          pragma Import (C, Reset_Prog_Mode, "reset_prog_mode");
          function Reset_Shell_Mode return C_Int;
          pragma Import (C, Reset_Shell_Mode, "reset_shell_mode");

          Err : C_Int;
       begin
          case Mode is
             when Curses => Err := Reset_Prog_Mode;
             when Shell  => Err := Reset_Shell_Mode;
          end case;
          if Err = Curses_Err then
             raise Curses_Exception;
          end if;
       end Reset_Curses_Mode;

       procedure Save_Terminal_State
       is
          function Savetty return C_Int;
          pragma Import (C, Savetty, "savetty");
       begin
          if Savetty = Curses_Err then
             raise Curses_Exception;
          end if;
       end Save_Terminal_State;

       procedure Reset_Terminal_State
       is
          function Resetty return C_Int;
          pragma Import (C, Resetty, "resetty");
       begin
          if Resetty = Curses_Err then
             raise Curses_Exception;
          end if;
       end Reset_Terminal_State;

       procedure Rip_Off_Lines (Lines : Integer;
                                Proc  : Stdscr_Init_Proc)
       is
          function Ripoffline (Lines : C_Int;
                               Proc  : Stdscr_Init_Proc) return C_Int;
          pragma Import (C, Ripoffline, "_nc_ripoffline");
       begin
          if Ripoffline (C_Int (Lines), Proc) = Curses_Err then
             raise Curses_Exception;
          end if;
       end Rip_Off_Lines;

       procedure Set_Cursor_Visibility (Visibility : in out Cursor_Visibility)
       is
          function Curs_Set (Curs : C_Int) return C_Int;
          pragma Import (C, Curs_Set, "curs_set");

          Res : C_Int;
       begin
          Res := Curs_Set (Cursor_Visibility'Pos (Visibility));
          if Res /= Curses_Err then
             Visibility := Cursor_Visibility'Val (Res);
          end if;
       end Set_Cursor_Visibility;

       procedure Nap_Milli_Seconds (Ms : Natural)
       is
          function Napms (Ms : C_Int) return C_Int;
          pragma Import (C, Napms, "napms");
       begin
          if Napms (C_Int (Ms)) = Curses_Err then
             raise Curses_Exception;
          end if;
       end Nap_Milli_Seconds;
    ------------------------------------------------------------------------------
       function Lines return Line_Count
       is
          function LINES_As_Function return Interfaces.C.int;
          pragma Import (C, LINES_As_Function, "LINES_as_function");
       begin
          return Line_Count (LINES_As_Function);
       end Lines;

       function Columns return Column_Count
       is
          function COLS_As_Function return Interfaces.C.int;
          pragma Import (C, COLS_As_Function, "COLS_as_function");
       begin
          return Column_Count (COLS_As_Function);
       end Columns;

       function Tab_Size return Natural
       is
          function TABSIZE_As_Function return Interfaces.C.int;
          pragma Import (C, TABSIZE_As_Function, "TABSIZE_as_function");

       begin
          return Natural (TABSIZE_As_Function);
       end Tab_Size;

       function Number_Of_Colors return Natural
       is
          function COLORS_As_Function return Interfaces.C.int;
          pragma Import (C, COLORS_As_Function, "COLORS_as_function");
       begin
          return Natural (COLORS_As_Function);
       end Number_Of_Colors;

       function Number_Of_Color_Pairs return Natural
       is
          function COLOR_PAIRS_As_Function return Interfaces.C.int;
          pragma Import (C, COLOR_PAIRS_As_Function, "COLOR_PAIRS_as_function");
       begin
          return Natural (COLOR_PAIRS_As_Function);
       end Number_Of_Color_Pairs;
    ------------------------------------------------------------------------------
       procedure Transform_Coordinates
         (W      : Window := Standard_Window;
          Line   : in out Line_Position;
          Column : in out Column_Position;
          Dir    : Transform_Direction := From_Screen)
       is
          type Int_Access is access all C_Int;
          function Transform (W    : Window;
                              Y, X : Int_Access;
                              Dir  : Curses_Bool) return C_Int;
          pragma Import (C, Transform, "wmouse_trafo");

          X : aliased C_Int := C_Int (Column);
          Y : aliased C_Int := C_Int (Line);
          D : Curses_Bool := Curses_Bool_False;
          R : C_Int;
       begin
          if Dir = To_Screen then
             D := 1;
          end if;
          R := Transform (W, Y'Access, X'Access, D);
          if R = Curses_False then
             raise Curses_Exception;
          else
             Line   := Line_Position (Y);
             Column := Column_Position (X);
          end if;
       end Transform_Coordinates;
    ------------------------------------------------------------------------------
       procedure Use_Default_Colors is
          function C_Use_Default_Colors return C_Int;
          pragma Import (C, C_Use_Default_Colors, "use_default_colors");
          Err : constant C_Int := C_Use_Default_Colors;
       begin
          if Err = Curses_Err then
             raise Curses_Exception;
          end if;
       end Use_Default_Colors;

       procedure Assume_Default_Colors (Fore : Color_Number := Default_Color;
                                        Back : Color_Number := Default_Color)
       is
          function C_Assume_Default_Colors (Fore : C_Int;
                                            Back : C_Int) return C_Int;
          pragma Import (C, C_Assume_Default_Colors, "assume_default_colors");

          Err : constant C_Int := C_Assume_Default_Colors (C_Int (Fore),
                                                           C_Int (Back));
       begin
          if Err = Curses_Err then
             raise Curses_Exception;
          end if;
       end Assume_Default_Colors;
    ------------------------------------------------------------------------------
       function Curses_Version return String
       is
          function curses_versionC return chars_ptr;
          pragma Import (C, curses_versionC, "curses_version");
          Result : constant chars_ptr := curses_versionC;
       begin
          return Fill_String (Result);
       end Curses_Version;
    ------------------------------------------------------------------------------
       procedure Curses_Free_All is
          procedure curses_freeall;
          pragma Import (C, curses_freeall, "_nc_freeall");
       begin
          --  Use this only for testing: you cannot use curses after calling it,
          --  so it has to be the "last" thing done before exiting the program.
          --  This will not really free ALL of memory used by curses.  That is
          --  because it cannot free the memory used for stdout's setbuf.  The
          --  _nc_free_and_exit() procedure can do that, but it can be invoked
          --  safely only from C - and again, that only as the "last" thing done
          --  before exiting the program.
          curses_freeall;
       end Curses_Free_All;
    ------------------------------------------------------------------------------
       function Use_Extended_Names (Enable : Boolean) return Boolean
       is
          function use_extended_namesC (e : Curses_Bool) return C_Int;
          pragma Import (C, use_extended_namesC, "use_extended_names");

          Res : constant C_Int :=
             use_extended_namesC (Curses_Bool (Boolean'Pos (Enable)));
       begin
          if Res = C_Int (Curses_Bool_False) then
             return False;
          else
             return True;
          end if;
       end Use_Extended_Names;
    ------------------------------------------------------------------------------
       procedure Screen_Dump_To_File (Filename : String)
       is
          function scr_dump (f : char_array) return C_Int;
          pragma Import (C, scr_dump, "scr_dump");
          Txt    : char_array (0 .. Filename'Length);
          Length : size_t;
       begin
          To_C (Filename, Txt, Length);
          if Curses_Err = scr_dump (Txt) then
             raise Curses_Exception;
          end if;
       end Screen_Dump_To_File;

       procedure Screen_Restore_From_File (Filename : String)
       is
          function scr_restore (f : char_array) return C_Int;
          pragma Import (C, scr_restore, "scr_restore");
          Txt    : char_array (0 .. Filename'Length);
          Length : size_t;
       begin
          To_C (Filename, Txt, Length);
          if Curses_Err = scr_restore (Txt)  then
             raise Curses_Exception;
          end if;
       end Screen_Restore_From_File;

       procedure Screen_Init_From_File (Filename : String)
       is
          function scr_init (f : char_array) return C_Int;
          pragma Import (C, scr_init, "scr_init");
          Txt    : char_array (0 .. Filename'Length);
          Length : size_t;
       begin
          To_C (Filename, Txt, Length);
          if Curses_Err = scr_init (Txt) then
             raise Curses_Exception;
          end if;
       end Screen_Init_From_File;

       procedure Screen_Set_File (Filename : String)
       is
          function scr_set (f : char_array) return C_Int;
          pragma Import (C, scr_set, "scr_set");
          Txt    : char_array (0 .. Filename'Length);
          Length : size_t;
       begin
          To_C (Filename, Txt, Length);
          if Curses_Err = scr_set (Txt) then
             raise Curses_Exception;
          end if;
       end Screen_Set_File;
    ------------------------------------------------------------------------------
       procedure Resize (Win               : Window := Standard_Window;
                         Number_Of_Lines   : Line_Count;
                         Number_Of_Columns : Column_Count) is
          function wresize (win     : Window;
                            lines   : C_Int;
                            columns : C_Int) return C_Int;
          pragma Import (C, wresize);
       begin
          if wresize (Win,
                      C_Int (Number_Of_Lines),
                      C_Int (Number_Of_Columns)) = Curses_Err
          then
             raise Curses_Exception;
          end if;
       end Resize;
    ------------------------------------------------------------------------------

    end Terminal_Interface.Curses;