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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;
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