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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [gcc/] [ada/] [g-tty.adb] - Blame information for rev 717

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1 706 jeremybenn
------------------------------------------------------------------------------
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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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