terminal_interface-curses-menus.adb

# File : terminal_interface-curses-menus.adb

    ------------------------------------------------------------------------------
    --                                                                          --
    --                           GNAT ncurses Binding                           --
    --                                                                          --
    --                      Terminal_Interface.Curses.Menus                     --
    --                                                                          --
    --                                 B O D Y                                  --
    --                                                                          --
    ------------------------------------------------------------------------------
    -- Copyright (c) 1998 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:  Jürgen Pfeifer, 1996
    --  Contact: www.familiepfeifer.de/Contact.aspx?Lang=en
    --  Version Control:
    --  @Revision: 1.21 @
    --  Binding Version 01.00
    ------------------------------------------------------------------------------
    with Ada.Unchecked_Deallocation;
    with Terminal_Interface.Curses.Aux; use Terminal_Interface.Curses.Aux;

    with Interfaces.C; use Interfaces.C;
    with Interfaces.C.Strings; use Interfaces.C.Strings;
    with Interfaces.C.Pointers;

    with Ada.Unchecked_Conversion;

    package body Terminal_Interface.Curses.Menus is

       type C_Item_Array is array (Natural range <>) of aliased Item;
       package I_Array is new
         Interfaces.C.Pointers (Natural, Item, C_Item_Array, Null_Item);

       use type System.Bit_Order;
       subtype chars_ptr is Interfaces.C.Strings.chars_ptr;

       function MOS_2_CInt is new
         Ada.Unchecked_Conversion (Menu_Option_Set,
                                   C_Int);

       function CInt_2_MOS is new
         Ada.Unchecked_Conversion (C_Int,
                                   Menu_Option_Set);

       function IOS_2_CInt is new
         Ada.Unchecked_Conversion (Item_Option_Set,
                                   C_Int);

       function CInt_2_IOS is new
         Ada.Unchecked_Conversion (C_Int,
                                   Item_Option_Set);

    ------------------------------------------------------------------------------
       procedure Request_Name (Key  : in Menu_Request_Code;
                               Name : out String)
       is
          function Request_Name (Key : C_Int) return chars_ptr;
          pragma Import (C, Request_Name, "menu_request_name");
       begin
          Fill_String (Request_Name (C_Int (Key)), Name);
       end Request_Name;

       function Request_Name (Key : Menu_Request_Code) return String
       is
          function Request_Name (Key : C_Int) return chars_ptr;
          pragma Import (C, Request_Name, "menu_request_name");
       begin
          return Fill_String (Request_Name (C_Int (Key)));
       end Request_Name;

       function Create (Name        : String;
                        Description : String := "") return Item
       is
          type Char_Ptr is access all Interfaces.C.char;
          function Newitem (Name, Desc : Char_Ptr) return Item;
          pragma Import (C, Newitem, "new_item");

          type Name_String is new char_array (0 .. Name'Length);
          type Name_String_Ptr is access Name_String;
          pragma Controlled (Name_String_Ptr);

          type Desc_String is new char_array (0 .. Description'Length);
          type Desc_String_Ptr is access Desc_String;
          pragma Controlled (Desc_String_Ptr);

          Name_Str : Name_String_Ptr := new Name_String;
          Desc_Str : Desc_String_Ptr := new Desc_String;
          Name_Len, Desc_Len : size_t;
          Result : Item;
       begin
          To_C (Name, Name_Str.all, Name_Len);
          To_C (Description, Desc_Str.all, Desc_Len);
          Result := Newitem (Name_Str.all (Name_Str.all'First)'Access,
                             Desc_Str.all (Desc_Str.all'First)'Access);
          if Result = Null_Item then
             raise Eti_System_Error;
          end if;
          return Result;
       end Create;

       procedure Delete (Itm : in out Item)
       is
          function Descname (Itm  : Item) return chars_ptr;
          pragma Import (C, Descname, "item_description");
          function Itemname (Itm  : Item) return chars_ptr;
          pragma Import (C, Itemname, "item_name");

          function Freeitem (Itm : Item) return C_Int;
          pragma Import (C, Freeitem, "free_item");

          Res : Eti_Error;
          Ptr : chars_ptr;
       begin
          Ptr := Descname (Itm);
          if Ptr /= Null_Ptr then
             Interfaces.C.Strings.Free (Ptr);
          end if;
          Ptr := Itemname (Itm);
          if Ptr /= Null_Ptr then
             Interfaces.C.Strings.Free (Ptr);
          end if;
          Res := Freeitem (Itm);
          if Res /= E_Ok then
             Eti_Exception (Res);
          end if;
          Itm := Null_Item;
       end Delete;
    -------------------------------------------------------------------------------
       procedure Set_Value (Itm   : in Item;
                            Value : in Boolean := True)
       is
          function Set_Item_Val (Itm : Item;
                                 Val : C_Int) return C_Int;
          pragma Import (C, Set_Item_Val, "set_item_value");

          Res : constant Eti_Error := Set_Item_Val (Itm, Boolean'Pos (Value));
       begin
          if  Res /= E_Ok then
             Eti_Exception (Res);
          end if;
       end Set_Value;

       function Value (Itm : Item) return Boolean
       is
          function Item_Val (Itm : Item) return C_Int;
          pragma Import (C, Item_Val, "item_value");
       begin
          if Item_Val (Itm) = Curses_False then
             return False;
          else
             return True;
          end if;
       end Value;

    -------------------------------------------------------------------------------
       function Visible (Itm : Item) return Boolean
       is
          function Item_Vis (Itm : Item) return C_Int;
          pragma Import (C, Item_Vis, "item_visible");
       begin
          if Item_Vis (Itm) = Curses_False then
             return False;
          else
             return True;
          end if;
       end Visible;
    -------------------------------------------------------------------------------
       procedure Set_Options (Itm     : in Item;
                              Options : in Item_Option_Set)
       is
          function Set_Item_Opts (Itm : Item;
                                  Opt : C_Int) return C_Int;
          pragma Import (C, Set_Item_Opts, "set_item_opts");

          Opt : C_Int := IOS_2_CInt (Options);
          Res : Eti_Error;
       begin
          Res := Set_Item_Opts (Itm, Opt);
          if Res /= E_Ok then
             Eti_Exception (Res);
          end if;
       end Set_Options;

       procedure Switch_Options (Itm     : in Item;
                                 Options : in Item_Option_Set;
                                 On      : Boolean := True)
       is
          function Item_Opts_On (Itm : Item;
                                 Opt : C_Int) return C_Int;
          pragma Import (C, Item_Opts_On, "item_opts_on");
          function Item_Opts_Off (Itm : Item;
                                  Opt : C_Int) return C_Int;
          pragma Import (C, Item_Opts_Off, "item_opts_off");

          Opt : C_Int := IOS_2_CInt (Options);
          Err : Eti_Error;
       begin
          if On then
             Err := Item_Opts_On (Itm, Opt);
          else
             Err := Item_Opts_Off (Itm, Opt);
          end if;
          if Err /= E_Ok then
             Eti_Exception (Err);
          end if;
       end Switch_Options;

       procedure Get_Options (Itm     : in  Item;
                              Options : out Item_Option_Set)
       is
          function Item_Opts (Itm : Item) return C_Int;
          pragma Import (C, Item_Opts, "item_opts");

          Res : C_Int := Item_Opts (Itm);
       begin
          Options := CInt_2_IOS (Res);
       end Get_Options;

       function Get_Options (Itm : Item := Null_Item) return Item_Option_Set
       is
          Ios : Item_Option_Set;
       begin
          Get_Options (Itm, Ios);
          return Ios;
       end Get_Options;
    -------------------------------------------------------------------------------
       procedure Name (Itm  : in Item;
                       Name : out String)
       is
          function Itemname (Itm : Item) return chars_ptr;
          pragma Import (C, Itemname, "item_name");
       begin
          Fill_String (Itemname (Itm), Name);
       end Name;

       function Name (Itm : in Item) return String
       is
          function Itemname (Itm : Item) return chars_ptr;
          pragma Import (C, Itemname, "item_name");
       begin
          return Fill_String (Itemname (Itm));
       end Name;

       procedure Description (Itm         : in Item;
                              Description : out String)
       is
          function Descname (Itm  : Item) return chars_ptr;
          pragma Import (C, Descname, "item_description");
       begin
          Fill_String (Descname (Itm), Description);
       end Description;

       function Description (Itm : in Item) return String
       is
          function Descname (Itm  : Item) return chars_ptr;
          pragma Import (C, Descname, "item_description");
       begin
          return Fill_String (Descname (Itm));
       end Description;
    -------------------------------------------------------------------------------
       procedure Set_Current (Men : in Menu;
                              Itm : in Item)
       is
          function Set_Curr_Item (Men : Menu;
                                  Itm : Item) return C_Int;
          pragma Import (C, Set_Curr_Item, "set_current_item");

          Res : constant Eti_Error := Set_Curr_Item (Men, Itm);
       begin
          if Res /= E_Ok then
             Eti_Exception (Res);
          end if;
       end Set_Current;

       function Current (Men : Menu) return Item
       is
          function Curr_Item (Men : Menu) return Item;
          pragma Import (C, Curr_Item, "current_item");

          Res : constant Item := Curr_Item (Men);
       begin
          if Res = Null_Item then
             raise Menu_Exception;
          end if;
          return Res;
       end Current;

       procedure Set_Top_Row (Men  : in Menu;
                              Line : in Line_Position)
       is
          function Set_Toprow (Men  : Menu;
                               Line : C_Int) return C_Int;
          pragma Import (C, Set_Toprow, "set_top_row");

          Res : constant Eti_Error := Set_Toprow (Men, C_Int (Line));
       begin
          if  Res /= E_Ok then
             Eti_Exception (Res);
          end if;
       end Set_Top_Row;

       function Top_Row (Men : Menu) return Line_Position
       is
          function Toprow (Men : Menu) return C_Int;
          pragma Import (C, Toprow, "top_row");

          Res : constant C_Int := Toprow (Men);
       begin
          if Res = Curses_Err then
             raise Menu_Exception;
          end if;
          return Line_Position (Res);
       end Top_Row;

       function Get_Index (Itm : Item) return Positive
       is
          function Get_Itemindex (Itm : Item) return C_Int;
          pragma Import (C, Get_Itemindex, "item_index");

          Res : constant C_Int := Get_Itemindex (Itm);
       begin
          if Res = Curses_Err then
             raise Menu_Exception;
          end if;
          return Positive (Natural (Res) + Positive'First);
       end Get_Index;
    -------------------------------------------------------------------------------
       procedure Post (Men  : in Menu;
                       Post : in Boolean := True)
       is
          function M_Post (Men : Menu) return C_Int;
          pragma Import (C, M_Post, "post_menu");
          function M_Unpost (Men : Menu) return C_Int;
          pragma Import (C, M_Unpost, "unpost_menu");

          Res : Eti_Error;
       begin
          if Post then
             Res := M_Post (Men);
          else
             Res := M_Unpost (Men);
          end if;
          if Res /= E_Ok then
             Eti_Exception (Res);
          end if;
       end Post;
    -------------------------------------------------------------------------------
       procedure Set_Options (Men     : in Menu;
                              Options : in Menu_Option_Set)
       is
          function Set_Menu_Opts (Men : Menu;
                                  Opt : C_Int) return C_Int;
          pragma Import (C, Set_Menu_Opts, "set_menu_opts");

          Opt : C_Int := MOS_2_CInt (Options);
          Res : Eti_Error;
       begin
          Res := Set_Menu_Opts (Men, Opt);
          if  Res /= E_Ok then
             Eti_Exception (Res);
          end if;
       end Set_Options;

       procedure Switch_Options (Men     : in Menu;
                                 Options : in Menu_Option_Set;
                                 On      : in Boolean := True)
       is
          function Menu_Opts_On (Men : Menu;
                                 Opt : C_Int) return C_Int;
          pragma Import (C, Menu_Opts_On, "menu_opts_on");
          function Menu_Opts_Off (Men : Menu;
                                  Opt : C_Int) return C_Int;
          pragma Import (C, Menu_Opts_Off, "menu_opts_off");

          Opt : C_Int := MOS_2_CInt (Options);
          Err : Eti_Error;
       begin
          if On then
             Err := Menu_Opts_On  (Men, Opt);
          else
             Err := Menu_Opts_Off (Men, Opt);
          end if;
          if Err /= E_Ok then
             Eti_Exception (Err);
          end if;
       end Switch_Options;

       procedure Get_Options (Men     : in  Menu;
                                   Options : out Menu_Option_Set)
       is
          function Menu_Opts (Men : Menu) return C_Int;
          pragma Import (C, Menu_Opts, "menu_opts");

          Res : C_Int := Menu_Opts (Men);
       begin
          Options := CInt_2_MOS (Res);
       end Get_Options;

       function Get_Options (Men : Menu := Null_Menu) return Menu_Option_Set
       is
          Mos : Menu_Option_Set;
       begin
          Get_Options (Men, Mos);
          return Mos;
       end Get_Options;
    -------------------------------------------------------------------------------
       procedure Set_Window (Men : in Menu;
                             Win : in Window)
       is
          function Set_Menu_Win (Men : Menu;
                                 Win : Window) return C_Int;
          pragma Import (C, Set_Menu_Win, "set_menu_win");

          Res : constant Eti_Error := Set_Menu_Win (Men, Win);
       begin
          if  Res /= E_Ok then
             Eti_Exception (Res);
          end if;
       end Set_Window;

       function Get_Window (Men : Menu) return Window
       is
          function Menu_Win (Men : Menu) return Window;
          pragma Import (C, Menu_Win, "menu_win");

          W : constant Window := Menu_Win (Men);
       begin
          return W;
       end Get_Window;

       procedure Set_Sub_Window (Men : in Menu;
                                 Win : in Window)
       is
          function Set_Menu_Sub (Men : Menu;
                                 Win : Window) return C_Int;
          pragma Import (C, Set_Menu_Sub, "set_menu_sub");

          Res : constant Eti_Error := Set_Menu_Sub (Men, Win);
       begin
          if  Res /= E_Ok then
             Eti_Exception (Res);
          end if;
       end Set_Sub_Window;

       function Get_Sub_Window (Men : Menu) return Window
       is
          function Menu_Sub (Men : Menu) return Window;
          pragma Import (C, Menu_Sub, "menu_sub");

          W : constant Window := Menu_Sub (Men);
       begin
          return W;
       end Get_Sub_Window;

       procedure Scale (Men     : in Menu;
                        Lines   : out Line_Count;
                        Columns : out Column_Count)
       is
          type C_Int_Access is access all C_Int;
          function M_Scale (Men    : Menu;
                            Yp, Xp : C_Int_Access) return C_Int;
          pragma Import (C, M_Scale, "scale_menu");

          X, Y : aliased C_Int;
          Res  : constant Eti_Error := M_Scale (Men, Y'Access, X'Access);
       begin
          if Res /= E_Ok then
             Eti_Exception (Res);
          end if;
          Lines := Line_Count (Y);
          Columns := Column_Count (X);
       end Scale;
    -------------------------------------------------------------------------------
       procedure Position_Cursor (Men : Menu)
       is
          function Pos_Menu_Cursor (Men : Menu) return C_Int;
          pragma Import (C, Pos_Menu_Cursor, "pos_menu_cursor");

          Res : constant Eti_Error := Pos_Menu_Cursor (Men);
       begin
          if  Res /= E_Ok then
             Eti_Exception (Res);
          end if;
       end Position_Cursor;

    -------------------------------------------------------------------------------
       procedure Set_Mark (Men  : in Menu;
                           Mark : in String)
       is
          type Char_Ptr is access all Interfaces.C.char;
          function Set_Mark (Men  : Menu;
                             Mark : Char_Ptr) return C_Int;
          pragma Import (C, Set_Mark, "set_menu_mark");

          Txt : char_array (0 .. Mark'Length);
          Len : size_t;
          Res : Eti_Error;
       begin
          To_C (Mark, Txt, Len);
          Res := Set_Mark (Men, Txt (Txt'First)'Access);
          if Res /= E_Ok then
             Eti_Exception (Res);
          end if;
       end Set_Mark;

       procedure Mark (Men  : in  Menu;
                       Mark : out String)
       is
          function Get_Menu_Mark (Men : Menu) return chars_ptr;
          pragma Import (C, Get_Menu_Mark, "menu_mark");
       begin
          Fill_String (Get_Menu_Mark (Men), Mark);
       end Mark;

       function Mark (Men : Menu) return String
       is
          function Get_Menu_Mark (Men : Menu) return chars_ptr;
          pragma Import (C, Get_Menu_Mark, "menu_mark");
       begin
          return Fill_String (Get_Menu_Mark (Men));
       end Mark;

    -------------------------------------------------------------------------------
       procedure Set_Foreground
         (Men   : in Menu;
          Fore  : in Character_Attribute_Set := Normal_Video;
          Color : in Color_Pair := Color_Pair'First)
       is
          function Set_Menu_Fore (Men  : Menu;
                                  Attr : C_Chtype) return C_Int;
          pragma Import (C, Set_Menu_Fore, "set_menu_fore");

          Ch : constant Attributed_Character := (Ch    => Character'First,
                                                 Color => Color,
                                                 Attr  => Fore);
          Res : constant Eti_Error := Set_Menu_Fore (Men, AttrChar_To_Chtype (Ch));
       begin
          if  Res /= E_Ok then
             Eti_Exception (Res);
          end if;
       end Set_Foreground;

       procedure Foreground (Men  : in  Menu;
                             Fore : out Character_Attribute_Set)
       is
          function Menu_Fore (Men : Menu) return C_Chtype;
          pragma Import (C, Menu_Fore, "menu_fore");
       begin
          Fore := Chtype_To_AttrChar (Menu_Fore (Men)).Attr;
       end Foreground;

       procedure Foreground (Men   : in  Menu;
                             Fore  : out Character_Attribute_Set;
                             Color : out Color_Pair)
       is
          function Menu_Fore (Men : Menu) return C_Chtype;
          pragma Import (C, Menu_Fore, "menu_fore");
       begin
          Fore  := Chtype_To_AttrChar (Menu_Fore (Men)).Attr;
          Color := Chtype_To_AttrChar (Menu_Fore (Men)).Color;
       end Foreground;

       procedure Set_Background
         (Men   : in Menu;
          Back  : in Character_Attribute_Set := Normal_Video;
          Color : in Color_Pair := Color_Pair'First)
       is
          function Set_Menu_Back (Men  : Menu;
                                  Attr : C_Chtype) return C_Int;
          pragma Import (C, Set_Menu_Back, "set_menu_back");

          Ch : constant Attributed_Character := (Ch    => Character'First,
                                                 Color => Color,
                                                 Attr  => Back);
          Res : constant Eti_Error := Set_Menu_Back (Men, AttrChar_To_Chtype (Ch));
       begin
          if  Res /= E_Ok then
             Eti_Exception (Res);
          end if;
       end Set_Background;

       procedure Background (Men  : in  Menu;
                             Back : out Character_Attribute_Set)
       is
          function Menu_Back (Men : Menu) return C_Chtype;
          pragma Import (C, Menu_Back, "menu_back");
       begin
          Back := Chtype_To_AttrChar (Menu_Back (Men)).Attr;
       end Background;

       procedure Background (Men   : in  Menu;
                             Back  : out Character_Attribute_Set;
                             Color : out Color_Pair)
       is
          function Menu_Back (Men : Menu) return C_Chtype;
          pragma Import (C, Menu_Back, "menu_back");
       begin
          Back  := Chtype_To_AttrChar (Menu_Back (Men)).Attr;
          Color := Chtype_To_AttrChar (Menu_Back (Men)).Color;
       end Background;

       procedure Set_Grey (Men   : in Menu;
                           Grey  : in Character_Attribute_Set := Normal_Video;
                           Color : in Color_Pair := Color_Pair'First)
       is
          function Set_Menu_Grey (Men  : Menu;
                                  Attr : C_Chtype) return C_Int;
          pragma Import (C, Set_Menu_Grey, "set_menu_grey");

          Ch : constant Attributed_Character := (Ch    => Character'First,
                                                 Color => Color,
                                                 Attr  => Grey);

          Res : constant Eti_Error := Set_Menu_Grey (Men, AttrChar_To_Chtype (Ch));
       begin
          if  Res /= E_Ok then
             Eti_Exception (Res);
          end if;
       end Set_Grey;

       procedure Grey (Men  : in  Menu;
                       Grey : out Character_Attribute_Set)
       is
          function Menu_Grey (Men : Menu) return C_Chtype;
          pragma Import (C, Menu_Grey, "menu_grey");
       begin
          Grey := Chtype_To_AttrChar (Menu_Grey (Men)).Attr;
       end Grey;

       procedure Grey (Men  : in  Menu;
                       Grey : out Character_Attribute_Set;
                       Color : out Color_Pair)
       is
          function Menu_Grey (Men : Menu) return C_Chtype;
          pragma Import (C, Menu_Grey, "menu_grey");
       begin
          Grey  := Chtype_To_AttrChar (Menu_Grey (Men)).Attr;
          Color := Chtype_To_AttrChar (Menu_Grey (Men)).Color;
       end Grey;

       procedure Set_Pad_Character (Men : in Menu;
                                    Pad : in Character := Space)
       is
          function Set_Menu_Pad (Men : Menu;
                                 Ch  : C_Int) return C_Int;
          pragma Import (C, Set_Menu_Pad, "set_menu_pad");

          Res : constant Eti_Error := Set_Menu_Pad (Men,
                                                    C_Int (Character'Pos (Pad)));
       begin
          if Res /= E_Ok then
             Eti_Exception (Res);
          end if;
       end Set_Pad_Character;

       procedure Pad_Character (Men : in  Menu;
                                Pad : out Character)
       is
          function Menu_Pad (Men : Menu) return C_Int;
          pragma Import (C, Menu_Pad, "menu_pad");
       begin
          Pad := Character'Val (Menu_Pad (Men));
       end Pad_Character;
    -------------------------------------------------------------------------------
       procedure Set_Spacing (Men   : in Menu;
                              Descr : in Column_Position := 0;
                              Row   : in Line_Position   := 0;
                              Col   : in Column_Position := 0)
       is
          function Set_Spacing (Men     : Menu;
                                D, R, C : C_Int) return C_Int;
          pragma Import (C, Set_Spacing, "set_menu_spacing");

          Res : constant Eti_Error := Set_Spacing (Men,
                                                   C_Int (Descr),
                                                   C_Int (Row),
                                                   C_Int (Col));
       begin
          if Res /= E_Ok then
             Eti_Exception (Res);
          end if;
       end Set_Spacing;

       procedure Spacing (Men   : in Menu;
                          Descr : out Column_Position;
                          Row   : out Line_Position;
                          Col   : out Column_Position)
       is
          type C_Int_Access is access all C_Int;
          function Get_Spacing (Men     : Menu;
                                D, R, C : C_Int_Access) return C_Int;
          pragma Import (C, Get_Spacing, "menu_spacing");

          D, R, C : aliased C_Int;
          Res : constant Eti_Error := Get_Spacing (Men,
                                                   D'Access,
                                                   R'Access,
                                                   C'Access);
       begin
          if Res /= E_Ok then
             Eti_Exception (Res);
          else
             Descr := Column_Position (D);
             Row   := Line_Position (R);
             Col   := Column_Position (C);
          end if;
       end Spacing;
    -------------------------------------------------------------------------------
       function Set_Pattern (Men  : Menu;
                             Text : String) return Boolean
       is
          type Char_Ptr is access all Interfaces.C.char;
          function Set_Pattern (Men     : Menu;
                                Pattern : Char_Ptr) return C_Int;
          pragma Import (C, Set_Pattern, "set_menu_pattern");

          S   : char_array (0 .. Text'Length);
          L   : size_t;
          Res : Eti_Error;
       begin
          To_C (Text, S, L);
          Res := Set_Pattern (Men, S (S'First)'Access);
          case Res is
             when E_No_Match => return False;
             when E_Ok       => return True;
             when others =>
                Eti_Exception (Res);
                return False;
          end case;
       end Set_Pattern;

       procedure Pattern (Men  : in  Menu;
                          Text : out String)
       is
          function Get_Pattern (Men : Menu) return chars_ptr;
          pragma Import (C, Get_Pattern, "menu_pattern");
       begin
          Fill_String (Get_Pattern (Men), Text);
       end Pattern;
    -------------------------------------------------------------------------------
       procedure Set_Format (Men     : in Menu;
                             Lines   : in Line_Count;
                             Columns : in Column_Count)
       is
          function Set_Menu_Fmt (Men : Menu;
                                 Lin : C_Int;
                                 Col : C_Int) return C_Int;
          pragma Import (C, Set_Menu_Fmt, "set_menu_format");

          Res : constant Eti_Error := Set_Menu_Fmt (Men,
                                                    C_Int (Lines),
                                                    C_Int (Columns));
       begin
          if  Res /= E_Ok then
             Eti_Exception (Res);
          end if;
       end Set_Format;

       procedure Format (Men     : in  Menu;
                         Lines   : out Line_Count;
                         Columns : out Column_Count)
       is
          type C_Int_Access is access all C_Int;
          function Menu_Fmt (Men  : Menu;
                             Y, X : C_Int_Access) return C_Int;
          pragma Import (C, Menu_Fmt, "menu_format");

          L, C : aliased C_Int;
          Res  : constant Eti_Error := Menu_Fmt (Men, L'Access, C'Access);
       begin
          if Res /= E_Ok then
             Eti_Exception (Res);
          else
             Lines   := Line_Count (L);
             Columns := Column_Count (C);
          end if;
       end Format;
    -------------------------------------------------------------------------------
       procedure Set_Item_Init_Hook (Men  : in Menu;
                                     Proc : in Menu_Hook_Function)
       is
          function Set_Item_Init (Men  : Menu;
                                  Proc : Menu_Hook_Function) return C_Int;
          pragma Import (C, Set_Item_Init, "set_item_init");

          Res : constant Eti_Error := Set_Item_Init (Men, Proc);
       begin
          if  Res /= E_Ok then
             Eti_Exception (Res);
          end if;
       end Set_Item_Init_Hook;

       procedure Set_Item_Term_Hook (Men  : in Menu;
                                     Proc : in Menu_Hook_Function)
       is
          function Set_Item_Term (Men  : Menu;
                                  Proc : Menu_Hook_Function) return C_Int;
          pragma Import (C, Set_Item_Term, "set_item_term");

          Res : constant Eti_Error := Set_Item_Term (Men, Proc);
       begin
          if Res /= E_Ok then
             Eti_Exception (Res);
          end if;
       end Set_Item_Term_Hook;

       procedure Set_Menu_Init_Hook (Men  : in Menu;
                                     Proc : in Menu_Hook_Function)
       is
          function Set_Menu_Init (Men  : Menu;
                                  Proc : Menu_Hook_Function) return C_Int;
          pragma Import (C, Set_Menu_Init, "set_menu_init");

          Res : constant Eti_Error := Set_Menu_Init (Men, Proc);
       begin
          if  Res /= E_Ok then
             Eti_Exception (Res);
          end if;
       end Set_Menu_Init_Hook;

       procedure Set_Menu_Term_Hook (Men  : in Menu;
                                     Proc : in Menu_Hook_Function)
       is
          function Set_Menu_Term (Men  : Menu;
                                  Proc : Menu_Hook_Function) return C_Int;
          pragma Import (C, Set_Menu_Term, "set_menu_term");

          Res : constant Eti_Error := Set_Menu_Term (Men, Proc);
       begin
          if Res /= E_Ok then
             Eti_Exception (Res);
          end if;
       end Set_Menu_Term_Hook;

       function Get_Item_Init_Hook (Men : Menu) return Menu_Hook_Function
       is
          function Item_Init (Men : Menu) return Menu_Hook_Function;
          pragma Import (C, Item_Init, "item_init");
       begin
          return Item_Init (Men);
       end Get_Item_Init_Hook;

       function Get_Item_Term_Hook (Men : Menu) return Menu_Hook_Function
       is
          function Item_Term (Men : Menu) return Menu_Hook_Function;
          pragma Import (C, Item_Term, "item_term");
       begin
          return Item_Term (Men);
       end Get_Item_Term_Hook;

       function Get_Menu_Init_Hook (Men : Menu) return Menu_Hook_Function
       is
          function Menu_Init (Men : Menu) return Menu_Hook_Function;
          pragma Import (C, Menu_Init, "menu_init");
       begin
          return Menu_Init (Men);
       end Get_Menu_Init_Hook;

       function Get_Menu_Term_Hook (Men : Menu) return Menu_Hook_Function
       is
          function Menu_Term (Men : Menu) return Menu_Hook_Function;
          pragma Import (C, Menu_Term, "menu_term");
       begin
          return Menu_Term (Men);
       end Get_Menu_Term_Hook;
    -------------------------------------------------------------------------------
       procedure Redefine (Men   : in Menu;
                           Items : in Item_Array_Access)
       is
          function Set_Items (Men   : Menu;
                              Items : System.Address) return C_Int;
          pragma Import (C, Set_Items, "set_menu_items");

          Res : Eti_Error;
       begin
          pragma Assert (Items (Items'Last) = Null_Item);
          if Items (Items'Last) /= Null_Item then
             raise Menu_Exception;
          else
             Res := Set_Items (Men, Items.all'Address);
             if  Res /= E_Ok then
                Eti_Exception (Res);
             end if;
          end if;
       end Redefine;

       function Item_Count (Men : Menu) return Natural
       is
          function Count (Men : Menu) return C_Int;
          pragma Import (C, Count, "item_count");
       begin
          return Natural (Count (Men));
       end Item_Count;

       function Items (Men   : Menu;
                       Index : Positive) return Item
       is
          use I_Array;

          function C_Mitems (Men : Menu) return Pointer;
          pragma Import (C, C_Mitems, "menu_items");

          P : Pointer := C_Mitems (Men);
       begin
          if P = null or else Index not in 1 .. Item_Count (Men) then
             raise Menu_Exception;
          else
             P := P + ptrdiff_t (C_Int (Index) - 1);
             return P.all;
          end if;
       end Items;

    -------------------------------------------------------------------------------
       function Create (Items : Item_Array_Access) return Menu
       is
          function Newmenu (Items : System.Address) return Menu;
          pragma Import (C, Newmenu, "new_menu");

          M   : Menu;
       begin
          pragma Assert (Items (Items'Last) = Null_Item);
          if Items (Items'Last) /= Null_Item then
             raise Menu_Exception;
          else
             M := Newmenu (Items.all'Address);
             if M = Null_Menu then
                raise Menu_Exception;
             end if;
             return M;
          end if;
       end Create;

       procedure Delete (Men : in out Menu)
       is
          function Free (Men : Menu) return C_Int;
          pragma Import (C, Free, "free_menu");

          Res : constant Eti_Error := Free (Men);
       begin
          if Res /= E_Ok then
             Eti_Exception (Res);
          end if;
          Men := Null_Menu;
       end Delete;

    ------------------------------------------------------------------------------
       function Driver (Men : Menu;
                        Key : Key_Code) return Driver_Result
       is
          function Driver (Men : Menu;
                           Key : C_Int) return C_Int;
          pragma Import (C, Driver, "menu_driver");

          R : Eti_Error := Driver (Men, C_Int (Key));
       begin
          if R /= E_Ok then
             case R is
                when E_Unknown_Command  => return Unknown_Request;
                when E_No_Match         => return No_Match;
                when E_Request_Denied |
                     E_Not_Selectable   => return Request_Denied;
                when others =>
                   Eti_Exception (R);
             end case;
          end if;
          return Menu_Ok;
       end Driver;

       procedure Free (IA         : in out Item_Array_Access;
                       Free_Items : in Boolean := False)
       is
          procedure Release is new Ada.Unchecked_Deallocation
            (Item_Array, Item_Array_Access);
       begin
          if IA /= null and then Free_Items then
             for I in IA'First .. (IA'Last - 1) loop
                if (IA (I) /= Null_Item) then
                   Delete (IA (I));
                end if;
             end loop;
          end if;
          Release (IA);
       end Free;

    -------------------------------------------------------------------------------
       function Default_Menu_Options return Menu_Option_Set
       is
       begin
          return Get_Options (Null_Menu);
       end Default_Menu_Options;

       function Default_Item_Options return Item_Option_Set
       is
       begin
          return Get_Options (Null_Item);
       end Default_Item_Options;
    -------------------------------------------------------------------------------

    end Terminal_Interface.Curses.Menus;