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Diffstat (limited to 'gcc/ada/libgnat/g-tty.adb')
| -rw-r--r-- | gcc/ada/libgnat/g-tty.adb | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/gcc/ada/libgnat/g-tty.adb b/gcc/ada/libgnat/g-tty.adb new file mode 100644 index 0000000..be9e7eb --- /dev/null +++ b/gcc/ada/libgnat/g-tty.adb @@ -0,0 +1,134 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT LIBRARY COMPONENTS -- +-- -- +-- G N A T . T T Y -- +-- -- +-- B o d y -- +-- -- +-- Copyright (C) 2002-2017, 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 -- +-- <http://www.gnu.org/licenses/>. -- +-- -- +-- 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; |