1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT RUN-TIME COMPONENTS                         --
4--                                                                          --
5--                     A D A . C O M M A N D _ L I N E                      --
6--                                                                          --
7--                                 B o d y                                  --
8--                                                                          --
9--          Copyright (C) 1992-2013, Free Software Foundation, Inc.         --
10--                                                                          --
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.                                     --
17--                                                                          --
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.               --
21--                                                                          --
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/>.                                          --
26--                                                                          --
27-- GNAT was originally developed  by the GNAT team at  New York University. --
28-- Extensive contributions were provided by Ada Core Technologies Inc.      --
29--                                                                          --
30------------------------------------------------------------------------------
31
32pragma Compiler_Unit_Warning;
33
34with System; use System;
35
36package body Ada.Command_Line is
37
38   function Arg_Count return Natural;
39   pragma Import (C, Arg_Count, "__gnat_arg_count");
40
41   procedure Fill_Arg (A : System.Address; Arg_Num : Integer);
42   pragma Import (C, Fill_Arg, "__gnat_fill_arg");
43
44   function Len_Arg (Arg_Num : Integer) return Integer;
45   pragma Import (C, Len_Arg, "__gnat_len_arg");
46
47   -----------------------
48   -- Local Subprograms --
49   -----------------------
50
51   function Initialized return Boolean;
52   --  Checks to ensure that gnat_argc and gnat_argv have been properly
53   --  initialized.  Returns false if not, or if argv / argc are
54   --  unsupported on the target (e.g. VxWorks).
55
56   --------------
57   -- Argument --
58   --------------
59
60   function Argument (Number : Positive) return String is
61      Num : Positive;
62
63   begin
64      if Number > Argument_Count then
65         raise Constraint_Error;
66      end if;
67
68      if Remove_Args = null then
69         Num := Number;
70      else
71         Num := Remove_Args (Number);
72      end if;
73
74      declare
75         Arg : aliased String (1 .. Len_Arg (Num));
76      begin
77         Fill_Arg (Arg'Address, Num);
78         return Arg;
79      end;
80   end Argument;
81
82   --------------------
83   -- Argument_Count --
84   --------------------
85
86   function Argument_Count return Natural is
87   begin
88      if not Initialized then
89         --  RM A.15 (11)
90         return 0;
91      end if;
92
93      if Remove_Args = null then
94         return Arg_Count - 1;
95      else
96         return Remove_Count;
97      end if;
98   end Argument_Count;
99
100   -----------------
101   -- Initialized --
102   -----------------
103
104   function Initialized return Boolean is
105      gnat_argv : System.Address;
106      pragma Import (C, gnat_argv, "gnat_argv");
107
108   begin
109      return gnat_argv /= System.Null_Address;
110   end Initialized;
111
112   ------------------
113   -- Command_Name --
114   ------------------
115
116   function Command_Name return String is
117   begin
118      if not Initialized then
119         return "";
120      end if;
121
122      declare
123         Arg : aliased String (1 .. Len_Arg (0));
124
125      begin
126         Fill_Arg (Arg'Address, 0);
127         return Arg;
128      end;
129   end Command_Name;
130
131end Ada.Command_Line;
132