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

--                                                                          --

--                         GNAT RUN-TIME COMPONENTS                         --

--                                                                          --

--             A D A . D I R E C T O R I E S . V A L I D I T Y              --

--                                                                          --

--                                 B o d y                                  --

--                              (VMS Version)                               --

--                                                                          --

--          Copyright (C) 2004-2009, 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 3,  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.                                     --

--                                                                          --

-- As a special exception under Section 7 of GPL version 3, you are granted --

-- additional permissions described in the GCC Runtime Library Exception,   --

-- version 3.1, as published by the Free Software Foundation.               --

--                                                                          --

-- You should have received a copy of the GNU General Public License and    --

-- a copy of the GCC Runtime Library Exception along with this program;     --

-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --

-- <http://www.gnu.org/licenses/>.                                          --

--                                                                          --

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

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

--                                                                          --

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

--  This is the OpenVMS version of this package

package body Ada.Directories.Validity is

   Max_Number_Of_Characters : constant := 39;

   Max_Path_Length          : constant := 1_024;

   Invalid_Character : constant array (Character) of Boolean :=

                         ('a' .. 'z' => False,

                          'A' .. 'Z' => False,

                          '0' .. '9' => False,

                          '_' | '$' | '-' | '.' => False,

                          others => True);

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

   -- Is_Path_Name_Case_Sensitive --

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

   function Is_Path_Name_Case_Sensitive return Boolean is

   begin

      return False;

   end Is_Path_Name_Case_Sensitive;

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

   -- Is_Valid_Path_Name --

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

   function Is_Valid_Path_Name (Name : String) return Boolean is

      First     : Positive := Name'First;

      Last      : Positive;

      Dot_Found : Boolean := False;

   begin

      --  A valid path (directory) name cannot be empty, and cannot contain

      --  more than 1024 characters. Directories can be ".", ".." or be simple

      --  name without extensions.

      if Name'Length = 0 or else Name'Length > Max_Path_Length then

         return False;

      else

         loop

            --  Look for the start of the next directory or file name

            while First <= Name'Last and then Name (First) = '/' loop

               First := First + 1;

            end loop;

            --  If all directories/file names are OK, return True

            exit when First > Name'Last;

            Last := First;

            Dot_Found := False;

            --  Look for the end of the directory/file name

            while Last < Name'Last loop

               exit when Name (Last + 1) = '/';

               Last := Last + 1;

               if Name (Last) = '.' then

                  Dot_Found := True;

               end if;

            end loop;

            --  If name include a dot, it can only be ".", ".." or the last

            --  file name.

            if Dot_Found then

               if Name (First .. Last) /= "." and then

                  Name (First .. Last) /= ".."

               then

                  return Last = Name'Last

                    and then Is_Valid_Simple_Name (Name (First .. Last));

               end if;

            --  Check if the directory/file name is valid

            elsif not Is_Valid_Simple_Name (Name (First .. Last)) then

                  return False;

            end if;

            --  Move to the next name

            First := Last + 1;

         end loop;

      end if;

      --  If Name follows the rules, then it is valid

      return True;

   end Is_Valid_Path_Name;

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

   -- Is_Valid_Simple_Name --

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

   function Is_Valid_Simple_Name (Name : String) return Boolean is

      In_Extension         : Boolean := False;

      Number_Of_Characters : Natural := 0;

   begin

      --  A file name cannot be empty, and cannot have more than 39 characters

      --  before or after a single '.'.

      if Name'Length = 0 then

         return False;

      else

         --  Check each character for validity

         for J in Name'Range loop

            if Invalid_Character (Name (J)) then

               return False;

            elsif Name (J) = '.' then

               --  Name cannot contain several dots

               if In_Extension then

                  return False;

               else

                  --  Reset the number of characters to count the characters

                  --  of the extension.

                  In_Extension := True;

                  Number_Of_Characters := 0;

               end if;

            else

               --  Check that the number of character is not too large

               Number_Of_Characters := Number_Of_Characters + 1;

               if Number_Of_Characters > Max_Number_Of_Characters then

                  return False;

               end if;

            end if;

         end loop;

      end if;

      --  If the rules are followed, then it is valid

      return True;

   end Is_Valid_Simple_Name;

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

   -- OpenVMS --

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

   function OpenVMS return Boolean is

   begin

      return True;

   end OpenVMS;

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

   -- Windows --

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

   function Windows return Boolean is

   begin

      return False;

   end Windows;

end Ada.Directories.Validity;