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------------------------------------------------------------------------------

--                                                                          --

--                         GNAT RUN-TIME COMPONENTS                         --

--                                                                          --

--                     A D A . C O M M A N D _ L I N E                      --

--                                                                          --

--                                 B o d y                                  --

--                                                                          --

--          Copyright (C) 1992-2009, Free Software Foundation, Inc.         --

--                                                                          --

-- 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.      --

--                                                                          --

------------------------------------------------------------------------------

pragma Compiler_Unit;

with System; use System;

package body Ada.Command_Line is

   function Arg_Count return Natural;

   pragma Import (C, Arg_Count, "__gnat_arg_count");

   procedure Fill_Arg (A : System.Address; Arg_Num : Integer);

   pragma Import (C, Fill_Arg, "__gnat_fill_arg");

   function Len_Arg (Arg_Num : Integer) return Integer;

   pragma Import (C, Len_Arg, "__gnat_len_arg");

   -----------------------

   -- Local Subprograms --

   -----------------------

   function Initialized return Boolean;

   --  Checks to ensure that gnat_argc and gnat_argv have been properly

   --  initialized.  Returns false if not, or if argv / argc are

   --  unsupported on the target (e.g. VxWorks).

   --------------

   -- Argument --

   --------------

   function Argument (Number : Positive) return String is

      Num : Positive;

   begin

      if Number > Argument_Count then

         raise Constraint_Error;

      end if;

      if Remove_Args = null then

         Num := Number;

      else

         Num := Remove_Args (Number);

      end if;

      declare

         Arg : aliased String (1 .. Len_Arg (Num));

      begin

         Fill_Arg (Arg'Address, Num);

         return Arg;

      end;

   end Argument;

   --------------------

   -- Argument_Count --

   --------------------

   function Argument_Count return Natural is

   begin

      if not Initialized then

         --  RM A.15 (11)

         return 0;

      end if;

      if Remove_Args = null then

         return Arg_Count - 1;

      else

         return Remove_Count;

      end if;

   end Argument_Count;

   -----------------

   -- Initialized --

   -----------------

   function Initialized return Boolean is

      gnat_argv : System.Address;

      pragma Import (C, gnat_argv, "gnat_argv");

   begin

      return gnat_argv /= System.Null_Address;

   end Initialized;

   ------------------

   -- Command_Name --

   ------------------

   function Command_Name return String is

   begin

      if not Initialized then

         return "";

      end if;

      declare

         Arg : aliased String (1 .. Len_Arg (0));

      begin

         Fill_Arg (Arg'Address, 0);

         return Arg;

      end;

   end Command_Name;

end Ada.Command_Line;