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-------------------------------------------------------------------------------
--
-- <STRONG>Copyright © 2001, 2002 by Thomas Wolf.</STRONG>
-- <BLOCKQUOTE>
-- This piece of software is free software; you can redistribute it and/or
-- modify it under the terms of the GNU General Public License as published
-- by the Free Software Foundation; either version 2, or (at your option)
-- any later version. This software is distributed in the hope that it will
-- be useful, but <EM>without any warranty</EM>; without even the implied
-- warranty of <EM>merchantability or fitness for a particular purpose.</EM>
-- See the GNU General Public License for more details. You should have
-- received a copy of the GNU General Public License with this distribution,
-- see file "<A HREF="GPL.txt">GPL.txt</A>". If not, write to the Free
-- Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
-- USA.
-- </BLOCKQUOTE>
-- <BLOCKQUOTE>
-- As a special exception from the GPL, if other files instantiate generics
-- from this unit, or you link this unit with other files to produce an
-- executable, this unit does not by itself cause the resulting executable
-- to be covered by the GPL. This exception does not however invalidate any
-- other reasons why the executable file might be covered by the GPL.
-- </BLOCKQUOTE>
--
-- <AUTHOR>
-- Thomas Wolf (TW) <E_MAIL>
-- </AUTHOR>
--
-- <PURPOSE>
-- Operations on environment variables.
-- </PURPOSE>
--
-- <TASKING>
-- Fully task- and abortion-safe.
-- </TASKING>
--
-- <NO_STORAGE>
--
-- <HISTORY>
-- 03-OCT-2001 TW Initial version.
-- 01-MAY-2002 TW Added 'Expand'.
-- 03-MAY-2002 TW Removed 'Expand', added tagged types and child
-- packages.
-- 27-JUN-2002 TW Added 'Get_Default' to avoid throwing and immediately
-- handling the 'Not_Defined' exception.
-- </HISTORY>
-------------------------------------------------------------------------------
pragma License (Modified_GPL);
with Interfaces.C.Strings;
package body Util.Environment is
use Interfaces.C;
use Interfaces.C.Strings;
----------------------------------------------------------------------------
-- We use the 'getenv' from the C standard library.
function Get_Env (Name : in char_array)
return chars_ptr;
pragma Import (C, Get_Env, "getenv");
protected Env is
function Get (Name : in String)
return String;
function Get_Default (Name : in String)
return String;
end Env;
protected body Env is
function Get
(Name : in String)
return String
is
C : chars_ptr;
begin
begin
C := Get_Env (To_C (Name));
exception
when others =>
C := Null_Ptr;
end;
if C = Null_Ptr then raise Not_Defined; end if;
return Value (C);
end Get;
function Get_Default
(Name : in String)
return String
is
C : chars_ptr;
begin
begin
C := Get_Env (To_C (Name));
exception
when others =>
C := Null_Ptr;
end;
if C = Null_Ptr then return ""; end if;
return Value (C);
end Get_Default;
end Env;
----------------------------------------------------------------------------
function Get
(Name : in String)
return String
is
begin
return Env.Get (Name);
end Get;
function Safe_Get
(Name : in String)
return String
is
begin
if Name'Last < Name'First then return ""; end if;
return Env.Get_Default (Name);
end Safe_Get;
function Get
(Self : access Expander;
Name : in String)
return String
is
pragma Warnings (Off, Self); -- silence -gnatwa
begin
return Safe_Get (Name);
end Get;
end Util.Environment;
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