1 ------------------------------------------------------------------------------
3 -- GNAT RUN-TIME COMPONENTS --
5 -- A D A . C O M M A N D _ L I N E --
9 -- Copyright (C) 1992-2009, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
18 -- As a special exception under Section 7 of GPL version 3, you are granted --
19 -- additional permissions described in the GCC Runtime Library Exception, --
20 -- version 3.1, as published by the Free Software Foundation. --
22 -- You should have received a copy of the GNU General Public License and --
23 -- a copy of the GCC Runtime Library Exception along with this program; --
24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
25 -- <http://www.gnu.org/licenses/>. --
27 -- GNAT was originally developed by the GNAT team at New York University. --
28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
30 ------------------------------------------------------------------------------
32 with System; use System;
34 package body Ada.Command_Line is
36 function Arg_Count return Natural;
37 pragma Import (C, Arg_Count, "__gnat_arg_count");
39 procedure Fill_Arg (A : System.Address; Arg_Num : Integer);
40 pragma Import (C, Fill_Arg, "__gnat_fill_arg");
42 function Len_Arg (Arg_Num : Integer) return Integer;
43 pragma Import (C, Len_Arg, "__gnat_len_arg");
45 -----------------------
46 -- Local Subprograms --
47 -----------------------
49 function Initialized return Boolean;
50 -- Checks to ensure that gnat_argc and gnat_argv have been properly
51 -- initialized. Returns false if not, or if argv / argc are
52 -- unsupported on the target (e.g. VxWorks).
58 function Argument (Number : Positive) return String is
62 if Number > Argument_Count then
63 raise Constraint_Error;
66 if Remove_Args = null then
69 Num := Remove_Args (Number);
73 Arg : aliased String (1 .. Len_Arg (Num));
76 Fill_Arg (Arg'Address, Num);
85 function Argument_Count return Natural is
87 if not Initialized then
92 if Remove_Args = null then
103 function Initialized return Boolean is
104 gnat_argv : System.Address;
105 pragma Import (C, gnat_argv, "gnat_argv");
108 return gnat_argv /= System.Null_Address;
115 function Command_Name return String is
117 if not Initialized then
122 Arg : aliased String (1 .. Len_Arg (0));
125 Fill_Arg (Arg'Address, 0);
130 end Ada.Command_Line;