gcc/ada/a-colien.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUNTIME 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 --                            $Revision: 1.2 $                              --
  10 --                                                                          --
  11 --          Copyright (C) 1996-2001 Free Software Foundation, Inc.          --
  12 --                                                                          --
  13 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  14 -- terms of the  GNU General Public License as published  by the Free Soft- --
  15 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  16 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  17 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  18 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  19 -- for  more details.  You should have  received  a copy of the GNU General --
  20 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  21 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  22 -- MA 02111-1307, USA.                                                      --
  23 --                                                                          --
  24 -- As a special exception,  if other files  instantiate  generics from this --
  25 -- unit, or you link  this unit with other files  to produce an executable, --
  26 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  27 -- covered  by the  GNU  General  Public  License.  This exception does not --
  28 -- however invalidate  any other reasons why  the executable file  might be --
  29 -- covered by the  GNU Public License.                                      --
  30 --                                                                          --
  31 -- GNAT was originally developed  by the GNAT team at  New York University. --
  32 -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
  33 --                                                                          --
  34 ------------------------------------------------------------------------------
  35
  36 with System;
  37 package body Ada.Command_Line.Environment is
  38
  39    -----------------------
  40    -- Environment_Count --
  41    -----------------------
  42
  43    function Environment_Count return Natural is
  44       function Env_Count return Natural;
  45       pragma Import (C, Env_Count, "__gnat_env_count");
  46
  47    begin
  48       return Env_Count;
  49    end Environment_Count;
  50
  51    -----------------------
  52    -- Environment_Value --
  53    -----------------------
  54
  55    function Environment_Value (Number : in Positive) return String is
  56       procedure Fill_Env (E : System.Address; Env_Num : Integer);
  57       pragma Import (C, Fill_Env, "__gnat_fill_env");
  58
  59       function Len_Env (Env_Num : Integer) return Integer;
  60       pragma Import (C, Len_Env, "__gnat_len_env");
  61
  62    begin
  63       if Number > Environment_Count then
  64          raise Constraint_Error;
  65       end if;
  66
  67       declare
  68          Env : aliased String (1 .. Len_Env (Number - 1));
  69       begin
  70          Fill_Env (Env'Address, Number - 1);
  71          return Env;
  72       end;
  73    end Environment_Value;
  74
  75 end Ada.Command_Line.Environment;