1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT RUN-TIME COMPONENTS                         --
4--                                                                          --
5--         A D A . C O M M A N D _ L I N E . E N V I R O N M E N T          --
6--                                                                          --
7--                                 B o d y                                  --
8--                                                                          --
9--          Copyright (C) 1996-2018, 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
32with System;
33
34package body Ada.Command_Line.Environment is
35
36   -----------------------
37   -- Environment_Count --
38   -----------------------
39
40   function Environment_Count return Natural is
41      function Env_Count return Natural;
42      pragma Import (C, Env_Count, "__gnat_env_count");
43
44   begin
45      return Env_Count;
46   end Environment_Count;
47
48   -----------------------
49   -- Environment_Value --
50   -----------------------
51
52   function Environment_Value (Number : Positive) return String is
53      procedure Fill_Env (E : System.Address; Env_Num : Integer);
54      pragma Import (C, Fill_Env, "__gnat_fill_env");
55
56      function Len_Env (Env_Num : Integer) return Integer;
57      pragma Import (C, Len_Env, "__gnat_len_env");
58
59   begin
60      if Number > Environment_Count then
61         raise Constraint_Error;
62      end if;
63
64      declare
65         Env : aliased String (1 .. Len_Env (Number - 1));
66      begin
67         Fill_Env (Env'Address, Number - 1);
68         return Env;
69      end;
70   end Environment_Value;
71
72end Ada.Command_Line.Environment;
73