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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;