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------------------------------------------------------------------------------
-- --
-- GNAT LIBRARY COMPONENTS --
-- --
-- G N A T . T T Y --
-- --
-- B o d y --
-- --
-- Copyright (C) 2002-2011, 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;
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