gcc/ada/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) 1996-2006, 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 2,  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.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  19 -- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
  20 -- Boston, MA 02110-1301, USA.                                              --
  21 --                                                                          --
  22 -- As a special exception,  if other files  instantiate  generics from this --
  23 -- unit, or you link  this unit with other files  to produce an executable, --
  24 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  25 -- covered  by the  GNU  General  Public  License.  This exception does not --
  26 -- however invalidate  any other reasons why  the executable file  might be --
  27 -- covered by the  GNU Public License.                                      --
  28 --                                                                          --
  29 -- GNAT was originally developed  by the GNAT team at  New York University. --
  30 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  31 --                                                                          --
  32 ------------------------------------------------------------------------------
  33
  34 with System;
  35
  36 package body Ada.Command_Line.Environment is
  37
  38    -----------------------
  39    -- Environment_Count --
  40    -----------------------
  41
  42    function Environment_Count return Natural is
  43       function Env_Count return Natural;
  44       pragma Import (C, Env_Count, "__gnat_env_count");
  45
  46    begin
  47       return Env_Count;
  48    end Environment_Count;
  49
  50    -----------------------
  51    -- Environment_Value --
  52    -----------------------
  53
  54    function Environment_Value (Number : Positive) return String is
  55       procedure Fill_Env (E : System.Address; Env_Num : Integer);
  56       pragma Import (C, Fill_Env, "__gnat_fill_env");
  57
  58       function Len_Env (Env_Num : Integer) return Integer;
  59       pragma Import (C, Len_Env, "__gnat_len_env");
  60
  61    begin
  62       if Number > Environment_Count then
  63          raise Constraint_Error;
  64       end if;
  65
  66       declare
  67          Env : aliased String (1 .. Len_Env (Number - 1));
  68       begin
  69          Fill_Env (Env'Address, Number - 1);
  70          return Env;
  71       end;
  72    end Environment_Value;
  73
  74 end Ada.Command_Line.Environment;