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+------------------------------------------------------------------------------
+-- --
+-- GNAT RUN-TIME COMPONENTS --
+-- --
+-- 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 --
+-- --
+-- B o d y --
+-- --
+-- Copyright (C) 1996-2009, 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. --
+-- --
+------------------------------------------------------------------------------
+
+with System;
+
+package body Ada.Command_Line.Environment is
+
+ -----------------------
+ -- Environment_Count --
+ -----------------------
+
+ function Environment_Count return Natural is
+ function Env_Count return Natural;
+ pragma Import (C, Env_Count, "__gnat_env_count");
+
+ begin
+ return Env_Count;
+ end Environment_Count;
+
+ -----------------------
+ -- Environment_Value --
+ -----------------------
+
+ function Environment_Value (Number : Positive) return String is
+ procedure Fill_Env (E : System.Address; Env_Num : Integer);
+ pragma Import (C, Fill_Env, "__gnat_fill_env");
+
+ function Len_Env (Env_Num : Integer) return Integer;
+ pragma Import (C, Len_Env, "__gnat_len_env");
+
+ begin
+ if Number > Environment_Count then
+ raise Constraint_Error;
+ end if;
+
+ declare
+ Env : aliased String (1 .. Len_Env (Number - 1));
+ begin
+ Fill_Env (Env'Address, Number - 1);
+ return Env;
+ end;
+ end Environment_Value;
+
+end Ada.Command_Line.Environment;