File : a-colien.adb
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) 1996-2009, 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 -- --
19 -- --
20 -- --
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
32 with System;
33
34 package 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
72 end Ada.Command_Line.Environment;