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------------------------------------------------------------------------------

--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                                F N A M E                                 --

--                                                                          --

--                                 B o d y                                  --

--                                                                          --

--          Copyright (C) 1992-2004, Free Software Foundation, Inc.         --

--                                                                          --

-- GNAT is free software;  you can  redistribute it  and/or modify it under --

-- terms of the  GNU General Public License as published  by the Free Soft- --

-- ware  Foundation;  either version 2,  or (at your option) any later ver- --

-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --

-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --

-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --

-- for  more details.  You should have  received  a copy of the GNU General --

-- Public License  distributed with GNAT;  see file COPYING.  If not, write --

-- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --

-- Boston, MA 02110-1301, USA.                                              --

--                                                                          --

-- As a special exception,  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  GNU  General  Public  License.  This exception does not --

-- however invalidate  any other reasons why  the executable file  might be --

-- covered by the  GNU Public License.                                      --

--                                                                          --

-- GNAT was originally developed  by the GNAT team at  New York University. --

-- Extensive contributions were provided by Ada Core Technologies Inc.      --

--                                                                          --

------------------------------------------------------------------------------

with Alloc;

with Hostparm; use Hostparm;

with Namet;    use Namet;

with Table;

package body Fname is

   -----------------------------

   -- Dummy Table Definitions --

   -----------------------------

   --  The following table was used in old versions of the compiler. We retain

   --  the declarations here for compatibility with old tree files. The new

   --  version of the compiler does not use this table, and will write out a

   --  dummy empty table for Tree_Write.

   type SFN_Entry is record

      U : Unit_Name_Type;

      F : File_Name_Type;

   end record;

   package SFN_Table is new Table.Table (

     Table_Component_Type => SFN_Entry,

     Table_Index_Type     => Int,

     Table_Low_Bound      => 0,

     Table_Initial        => Alloc.SFN_Table_Initial,

     Table_Increment      => Alloc.SFN_Table_Increment,

     Table_Name           => "Fname_Dummy_Table");

   ---------------------------

   -- Is_Internal_File_Name --

   ---------------------------

   function Is_Internal_File_Name

     (Fname              : File_Name_Type;

      Renamings_Included : Boolean := True) return Boolean

   is

   begin

      if Is_Predefined_File_Name (Fname, Renamings_Included) then

         return True;

      --  Once Is_Predefined_File_Name has been called and returns False,

      --  Name_Buffer contains Fname and Name_Len is set to 8.

      elsif Name_Buffer (1 .. 2) = "g-"

        or else Name_Buffer (1 .. 8) = "gnat    "

      then

         return True;

      elsif OpenVMS

        and then

          (Name_Buffer (1 .. 4) = "dec-"

             or else Name_Buffer (1 .. 8) = "dec     ")

      then

         return True;

      else

         return False;

      end if;

   end Is_Internal_File_Name;

   -----------------------------

   -- Is_Predefined_File_Name --

   -----------------------------

   --  This should really be a test of unit name, given the possibility of

   --  pragma Source_File_Name setting arbitrary file names for any files???

   --  Once Is_Predefined_File_Name has been called and returns False,

   --  Name_Buffer contains Fname and Name_Len is set to 8. This is used

   --  only by Is_Internal_File_Name, and is not part of the official

   --  external interface of this function.

   function Is_Predefined_File_Name

     (Fname              : File_Name_Type;

      Renamings_Included : Boolean := True) return Boolean

   is

   begin

      Get_Name_String (Fname);

      return Is_Predefined_File_Name (Renamings_Included);

   end Is_Predefined_File_Name;

   function Is_Predefined_File_Name

     (Renamings_Included : Boolean := True) return Boolean

   is

      subtype Str8 is String (1 .. 8);

      Predef_Names : constant array (1 .. 11) of Str8 :=

        ("ada     ",       -- Ada

         "calendar",       -- Calendar

         "interfac",       -- Interfaces

         "system  ",       -- System

         "machcode",       -- Machine_Code

         "unchconv",       -- Unchecked_Conversion

         "unchdeal",       -- Unchecked_Deallocation

         --  Remaining entries are only considered if Renamings_Included true

         "directio",       -- Direct_IO

         "ioexcept",       -- IO_Exceptions

         "sequenio",       -- Sequential_IO

         "text_io ");      -- Text_IO

         Num_Entries : constant Natural :=

                         7 + 4 * Boolean'Pos (Renamings_Included);

   begin

      --  Remove extension (if present)

      if Name_Len > 4 and then Name_Buffer (Name_Len - 3) = '.' then

         Name_Len := Name_Len - 4;

      end if;

      --  Definitely false if longer than 12 characters (8.3)

      if Name_Len > 8 then

         return False;

      --  Definitely predefined if prefix is a- i- or s- followed by letter

      elsif Name_Len >=  3

        and then Name_Buffer (2) = '-'

        and then (Name_Buffer (1) = 'a'

                    or else

                  Name_Buffer (1) = 'i'

                    or else

                  Name_Buffer (1) = 's')

        and then (Name_Buffer (3) in 'a' .. 'z'

                    or else

                  Name_Buffer (3) in 'A' .. 'Z')

      then

         return True;

      end if;

      --  Otherwise check against special list, first padding to 8 characters

      while Name_Len < 8 loop

         Name_Len := Name_Len + 1;

         Name_Buffer (Name_Len) := ' ';

      end loop;

      for J in 1 .. Num_Entries loop

         if Name_Buffer (1 .. 8) = Predef_Names (J) then

            return True;

         end if;

      end loop;

      --  Note: when we return False here, the Name_Buffer contains the

      --  padded file name. This is not defined for clients of the package,

      --  but is used by Is_Internal_File_Name.

      return False;

   end Is_Predefined_File_Name;

   ---------------

   -- Tree_Read --

   ---------------

   procedure Tree_Read is

   begin

      SFN_Table.Tree_Read;

   end Tree_Read;

   ----------------

   -- Tree_Write --

   ----------------

   procedure Tree_Write is

   begin

      SFN_Table.Tree_Write;

   end Tree_Write;

end Fname;