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------------------------------------------------------------------------------
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-- --
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-- GNAT LIBRARY COMPONENTS --
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-- --
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-- G N A T . T T Y --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 2002-2011, AdaCore --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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with Interfaces.C.Strings; use Interfaces.C.Strings;
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package body GNAT.TTY is
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use System;
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procedure Check_TTY (Handle : TTY_Handle);
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-- Check the validity of Handle. Raise Program_Error if ttys are not
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-- supported. Raise Constraint_Error if Handle is an invalid handle.
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------------------
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-- Allocate_TTY --
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------------------
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procedure Allocate_TTY (Handle : out TTY_Handle) is
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function Internal return System.Address;
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pragma Import (C, Internal, "__gnat_new_tty");
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begin
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if not TTY_Supported then
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raise Program_Error;
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end if;
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Handle.Handle := Internal;
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end Allocate_TTY;
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---------------
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-- Check_TTY --
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---------------
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procedure Check_TTY (Handle : TTY_Handle) is
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begin
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if not TTY_Supported then
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raise Program_Error;
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elsif Handle.Handle = System.Null_Address then
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raise Constraint_Error;
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end if;
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end Check_TTY;
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---------------
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-- Close_TTY --
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---------------
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procedure Close_TTY (Handle : in out TTY_Handle) is
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procedure Internal (Handle : System.Address);
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pragma Import (C, Internal, "__gnat_close_tty");
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begin
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Check_TTY (Handle);
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Internal (Handle.Handle);
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Handle.Handle := System.Null_Address;
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end Close_TTY;
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---------------
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-- Reset_TTY --
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---------------
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procedure Reset_TTY (Handle : TTY_Handle) is
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procedure Internal (Handle : System.Address);
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pragma Import (C, Internal, "__gnat_reset_tty");
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begin
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Check_TTY (Handle);
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Internal (Handle.Handle);
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end Reset_TTY;
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--------------------
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-- TTY_Descriptor --
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--------------------
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function TTY_Descriptor
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(Handle : TTY_Handle) return GNAT.OS_Lib.File_Descriptor
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is
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function Internal
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(Handle : System.Address) return GNAT.OS_Lib.File_Descriptor;
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pragma Import (C, Internal, "__gnat_tty_fd");
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begin
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Check_TTY (Handle);
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return Internal (Handle.Handle);
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end TTY_Descriptor;
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--------------
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-- TTY_Name --
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--------------
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function TTY_Name (Handle : TTY_Handle) return String is
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function Internal (Handle : System.Address) return chars_ptr;
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pragma Import (C, Internal, "__gnat_tty_name");
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begin
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Check_TTY (Handle);
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return Value (Internal (Handle.Handle));
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end TTY_Name;
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-------------------
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-- TTY_Supported --
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-------------------
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function TTY_Supported return Boolean is
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function Internal return Integer;
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pragma Import (C, Internal, "__gnat_tty_supported");
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begin
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return Internal /= 0;
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end TTY_Supported;
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end GNAT.TTY;
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