gcc/ada/prj-ext.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                              P R J . E X T                               --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --                                                                          --
  10 --             Copyright (C) 2000 Free Software Foundation, Inc.            --
  11 --                                                                          --
  12 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  13 -- terms of the  GNU General Public License as published  by the Free Soft- --
  14 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  15 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  16 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  17 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  18 -- for  more details.  You should have  received  a copy of the GNU General --
  19 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  20 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  21 -- MA 02111-1307, USA.                                                      --
  22 --                                                                          --
  23 -- GNAT was originally developed  by the GNAT team at  New York University. --
  24 -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
  25 --                                                                          --
  26 ------------------------------------------------------------------------------
  27
  28 with GNAT.HTable;
  29 with GNAT.OS_Lib; use GNAT.OS_Lib;
  30 with Namet;       use Namet;
  31 with Prj.Com;     use Prj.Com;
  32 with Stringt;     use Stringt;
  33 with Types;       use Types;
  34
  35 package body Prj.Ext is
  36
  37    package Htable is new GNAT.HTable.Simple_HTable
  38      (Header_Num => Header_Num,
  39       Element    => String_Id,
  40       No_Element => No_String,
  41       Key        => Name_Id,
  42       Hash       => Hash,
  43       Equal      => "=");
  44
  45    ---------
  46    -- Add --
  47    ---------
  48
  49    procedure Add
  50      (External_Name : String;
  51       Value         : String)
  52    is
  53       The_Key   : Name_Id;
  54       The_Value : String_Id;
  55
  56    begin
  57       Start_String;
  58       Store_String_Chars (Value);
  59       The_Value := End_String;
  60       Name_Len := External_Name'Length;
  61       Name_Buffer (1 .. Name_Len) := External_Name;
  62       The_Key := Name_Find;
  63       Htable.Set (The_Key, The_Value);
  64    end Add;
  65
  66    -----------
  67    -- Check --
  68    -----------
  69
  70    function Check (Declaration : String) return Boolean is
  71    begin
  72       for Equal_Pos in Declaration'Range loop
  73
  74          if Declaration (Equal_Pos) = '=' then
  75             exit when Equal_Pos = Declaration'First;
  76             exit when Equal_Pos = Declaration'Last;
  77             Add
  78               (External_Name =>
  79                  Declaration (Declaration'First .. Equal_Pos - 1),
  80                Value =>
  81                  Declaration (Equal_Pos + 1 .. Declaration'Last));
  82             return True;
  83          end if;
  84
  85       end loop;
  86
  87       return False;
  88    end Check;
  89
  90    --------------
  91    -- Value_Of --
  92    --------------
  93
  94    function Value_Of
  95      (External_Name : Name_Id;
  96       With_Default  : String_Id := No_String)
  97       return          String_Id
  98    is
  99       The_Value : String_Id;
 100
 101    begin
 102       The_Value := Htable.Get (External_Name);
 103
 104       if The_Value /= No_String then
 105          return The_Value;
 106       end if;
 107
 108       --  Find if it is an environment.
 109       --  If it is, put the value in the hash table.
 110
 111       declare
 112          Env_Value : constant String_Access :=
 113            Getenv (Get_Name_String (External_Name));
 114
 115       begin
 116          if Env_Value /= null and then Env_Value'Length > 0 then
 117             Start_String;
 118             Store_String_Chars (Env_Value.all);
 119             The_Value := End_String;
 120             Htable.Set (External_Name, The_Value);
 121             return The_Value;
 122
 123          else
 124             return With_Default;
 125          end if;
 126       end;
 127    end Value_Of;
 128
 129 end Prj.Ext;