terminal_interface-curses-termcap.adb

# File : terminal_interface-curses-termcap.adb

    ------------------------------------------------------------------------------
    --                                                                          --
    --                           GNAT ncurses Binding                           --
    --                                                                          --
    --                    Terminal_Interface.Curses.Termcap                     --
    --                                                                          --
    --                                 B O D Y                                  --
    --                                                                          --
    ------------------------------------------------------------------------------
    -- Copyright 2020 Thomas E. Dickey                                          --
    -- Copyright 2000-2006,2009 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: 1.13 @
    --  @Date: 2020/02/02 23:34:34 @
    --  Binding Version 01.00
    ------------------------------------------------------------------------------

    with Terminal_Interface.Curses.Aux; use Terminal_Interface.Curses.Aux;
    with Interfaces.C; use Interfaces.C;
    with Interfaces.C.Strings; use Interfaces.C.Strings;

    package body Terminal_Interface.Curses.Termcap is

       function Get_Entry (Name : String) return Boolean
       is
          function tgetent (name : char_array; val : char_array)
                            return C_Int;
          pragma Import (C, tgetent, "tgetent");
          NameTxt : char_array (0 .. Name'Length);
          Length  : size_t;
          ignored : constant char_array (0 .. 0) := (0 => nul);
          result  : C_Int;
       begin
          To_C (Name, NameTxt, Length);
          result := tgetent (char_array (ignored), NameTxt);
          if result = -1 then
             raise Curses_Exception;
          else
             return Boolean'Val (result);
          end if;
       end Get_Entry;

    ------------------------------------------------------------------------------
       function Get_Flag (Name : String) return Boolean
       is
          function tgetflag (id : char_array) return C_Int;
          pragma Import (C, tgetflag, "tgetflag");
          Txt    : char_array (0 .. Name'Length);
          Length : size_t;
       begin
          To_C (Name, Txt, Length);
          if tgetflag (Txt) = 0 then
             return False;
          else
             return True;
          end if;
       end Get_Flag;

    ------------------------------------------------------------------------------
       procedure Get_Number (Name   : String;
                             Value  : out Integer;
                             Result : out Boolean)
       is
          function tgetnum (id : char_array) return C_Int;
          pragma Import (C, tgetnum, "tgetnum");
          Txt    : char_array (0 .. Name'Length);
          Length : size_t;
       begin
          To_C (Name, Txt, Length);
          Value := Integer (tgetnum (Txt));
          if Value = -1 then
             Result := False;
          else
             Result :=  True;
          end if;
       end Get_Number;

    ------------------------------------------------------------------------------
       procedure Get_String (Name   : String;
                             Value  : out String;
                             Result : out Boolean)
       is
          function tgetstr (id  : char_array;
                            buf : char_array) return chars_ptr;
          pragma Import (C, tgetstr, "tgetstr");
          Txt    : char_array (0 .. Name'Length);
          Length : size_t;
          Txt2   : chars_ptr;
          type t is new char_array (0 .. 1024); --  does it need to be 1024?
          Return_Buffer : constant t := (others => nul);
       begin
          To_C (Name, Txt, Length);
          Txt2 := tgetstr (Txt, char_array (Return_Buffer));
          if Txt2 = Null_Ptr then
             Result := False;
          else
             Value := Fill_String (Txt2);
             Result := True;
          end if;
       end Get_String;

       function Get_String (Name : String) return Boolean
       is
          function tgetstr (Id  : char_array;
                            buf : char_array) return chars_ptr;
          pragma Import (C, tgetstr, "tgetstr");
          Txt    : char_array (0 .. Name'Length);
          Length : size_t;
          Txt2   : chars_ptr;
          type t is new char_array (0 .. 1024); --  does it need to be 1024?
          Phony_Txt : constant t := (others => nul);
       begin
          To_C (Name, Txt, Length);
          Txt2 := tgetstr (Txt, char_array (Phony_Txt));
          if Txt2 = Null_Ptr then
             return False;
          else
             return True;
          end if;
       end Get_String;

    ------------------------------------------------------------------------------
       function TGoto (Cap : String;
                       Col : Column_Position;
                       Row : Line_Position) return Termcap_String is
          function tgoto (cap : char_array;
                          col : C_Int;
                          row : C_Int) return chars_ptr;
          pragma Import (C, tgoto);
          Txt    : char_array (0 .. Cap'Length);
          Length : size_t;
       begin
          To_C (Cap, Txt, Length);
          return Termcap_String (Fill_String
                                 (tgoto (Txt, C_Int (Col), C_Int (Row))));
       end TGoto;

    end Terminal_Interface.Curses.Termcap;