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   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 --                                 S p e c                                  --
   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 -- 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
  32 --  Note: Services offered by this package are guaranteed to be platform
  33 --  independent as long as no call to GNAT.OS_Lib.Setenv or to C putenv
  34 --  routine is done. On some platforms the services below will report new
  35 --  environment variables (e.g. Windows) on some others it will not
  36 --  (e.g. GNU/Linux and Solaris).
  37
  38 package Ada.Command_Line.Environment is
  39
  40    function Environment_Count return Natural;
  41    --  If the external execution environment supports passing the environment
  42    --  to a program, then Environment_Count returns the number of environment
  43    --  variables in the environment of the program invoking the function.
  44    --  Otherwise it returns 0.  And that's a lot of environment.
  45
  46    function Environment_Value (Number : Positive) return String;
  47    --  If the external execution environment supports passing the environment
  48    --  to a program, then Environment_Value returns an implementation-defined
  49    --  value corresponding to the value at relative position Number. If Number
  50    --  is outside the range 1 .. Environment_Count, then Constraint_Error is
  51    --  propagated.
  52    --
  53    --  in GNAT: Corresponds to envp [n-1] (for n > 0) in C.
  54
  55 end Ada.Command_Line.Environment;