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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                                  --

--                            (Windows 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 Windows version of this package

with Ada.Characters.Latin_1; use Ada.Characters.Latin_1;

package body Ada.Directories.Validity is

   Invalid_Character : constant array (Character) of Boolean :=

                         (NUL .. US | '\'       => True,

                          '/' | ':' | '*' | '?' => True,

                          '"' | '<' | '>' | '|' => True,

                          DEL .. NBSP           => True,

                          others                => False);

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

   -- 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

      Start : Positive := Name'First;

      Last  : Natural;

   begin

      --  A path name cannot be empty, cannot contain more than 256 characters,

      --  cannot contain invalid characters and each directory/file name need

      --  to be valid.

      if Name'Length = 0 or else Name'Length > 256 then

         return False;

      else

         --  A drive letter may be specified at the beginning

         if Name'Length >= 2

           and then  Name (Start + 1) = ':'

           and then

            (Name (Start) in 'A' .. 'Z' or else

             Name (Start) in 'a' .. 'z')

         then

            Start := Start + 2;

            --  A drive letter followed by a colon and followed by nothing or

            --  by a relative path is an ambiguous path name on Windows, so we

            --  don't accept it.

            if Start > Name'Last

              or else (Name (Start) /= '/' and then Name (Start) /= '\')

            then

               return False;

            end if;

         end if;

         loop

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

            while Start <= Name'Last and then

              (Name (Start) = '\' or Name (Start) = '/')

            loop

               Start := Start + 1;

            end loop;

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

            exit when Start > Name'Last;

            Last := Start;

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

            while Last < Name'Last loop

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

               Last := Last + 1;

            end loop;

            --  Check if the directory/file name is valid

            if not Is_Valid_Simple_Name (Name (Start .. Last)) then

                  return False;

            end if;

            --  Move to the next name

            Start := Last + 1;

         end loop;

      end if;

      --  If Name follows the rules, it is valid

      return True;

   end Is_Valid_Path_Name;

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

   -- Is_Valid_Simple_Name --

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

   function Is_Valid_Simple_Name (Name : String) return Boolean is

      Only_Spaces : Boolean;

   begin

      --  A file name cannot be empty, cannot contain more than 256 characters,

      --  and cannot contain invalid characters.

      if Name'Length = 0 or else Name'Length > 256 then

         return False;

      --  Name length is OK

      else

         Only_Spaces := True;

         for J in Name'Range loop

            if Invalid_Character (Name (J)) then

               return False;

            elsif Name (J) /= ' ' then

               Only_Spaces := False;

            end if;

         end loop;

         --  If no invalid chars, and not all spaces, file name is valid

         return not Only_Spaces;

      end if;

   end Is_Valid_Simple_Name;

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

   -- OpenVMS --

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

   function OpenVMS return Boolean is

   begin

      return False;

   end OpenVMS;

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

   -- Windows --

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

   function Windows return Boolean is

   begin

      return True;

   end Windows;

end Ada.Directories.Validity;