------------------------------------------------------------------------------ -- -- -- GNAT LIBRARY COMPONENTS -- -- -- -- G N A T . T T Y -- -- -- -- B o d y -- -- -- -- Copyright (C) 2002-2018, AdaCore -- -- -- -- GNAT is free software; you can redistribute it and/or modify it under -- -- terms of the GNU General Public License as published by the Free Soft- -- -- ware Foundation; either version 3, or (at your option) any later ver- -- -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- -- or FITNESS FOR A PARTICULAR PURPOSE. -- -- -- -- As a special exception under Section 7 of GPL version 3, you are granted -- -- additional permissions described in the GCC Runtime Library Exception, -- -- version 3.1, as published by the Free Software Foundation. -- -- -- -- You should have received a copy of the GNU General Public License and -- -- a copy of the GCC Runtime Library Exception along with this program; -- -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- -- . -- -- -- -- GNAT was originally developed by the GNAT team at New York University. -- -- Extensive contributions were provided by Ada Core Technologies Inc. -- -- -- ------------------------------------------------------------------------------ with Interfaces.C.Strings; use Interfaces.C.Strings; package body GNAT.TTY is use System; procedure Check_TTY (Handle : TTY_Handle); -- Check the validity of Handle. Raise Program_Error if ttys are not -- supported. Raise Constraint_Error if Handle is an invalid handle. ------------------ -- Allocate_TTY -- ------------------ procedure Allocate_TTY (Handle : out TTY_Handle) is function Internal return System.Address; pragma Import (C, Internal, "__gnat_new_tty"); begin if not TTY_Supported then raise Program_Error; end if; Handle.Handle := Internal; end Allocate_TTY; --------------- -- Check_TTY -- --------------- procedure Check_TTY (Handle : TTY_Handle) is begin if not TTY_Supported then raise Program_Error; elsif Handle.Handle = System.Null_Address then raise Constraint_Error; end if; end Check_TTY; --------------- -- Close_TTY -- --------------- procedure Close_TTY (Handle : in out TTY_Handle) is procedure Internal (Handle : System.Address); pragma Import (C, Internal, "__gnat_close_tty"); begin Check_TTY (Handle); Internal (Handle.Handle); Handle.Handle := System.Null_Address; end Close_TTY; --------------- -- Reset_TTY -- --------------- procedure Reset_TTY (Handle : TTY_Handle) is procedure Internal (Handle : System.Address); pragma Import (C, Internal, "__gnat_reset_tty"); begin Check_TTY (Handle); Internal (Handle.Handle); end Reset_TTY; -------------------- -- TTY_Descriptor -- -------------------- function TTY_Descriptor (Handle : TTY_Handle) return GNAT.OS_Lib.File_Descriptor is function Internal (Handle : System.Address) return GNAT.OS_Lib.File_Descriptor; pragma Import (C, Internal, "__gnat_tty_fd"); begin Check_TTY (Handle); return Internal (Handle.Handle); end TTY_Descriptor; -------------- -- TTY_Name -- -------------- function TTY_Name (Handle : TTY_Handle) return String is function Internal (Handle : System.Address) return chars_ptr; pragma Import (C, Internal, "__gnat_tty_name"); begin Check_TTY (Handle); return Value (Internal (Handle.Handle)); end TTY_Name; ------------------- -- TTY_Supported -- ------------------- function TTY_Supported return Boolean is function Internal return Integer; pragma Import (C, Internal, "__gnat_tty_supported"); begin return Internal /= 0; end TTY_Supported; end GNAT.TTY;