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1 706 jeremybenn
------------------------------------------------------------------------------
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--                                                                          --
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--                         GNAT RUN-TIME COMPONENTS                         --
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--                                                                          --
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--             A D A . D I R E C T O R I E S . V A L I D I T Y              --
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--                                                                          --
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--                                 B o d y                                  --
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--                              (VMS Version)                               --
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--                                                                          --
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--          Copyright (C) 2004-2009, Free Software Foundation, Inc.         --
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--                                                                          --
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-- GNAT is free software;  you can  redistribute it  and/or modify it under --
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-- terms of the  GNU General Public License as published  by the Free Soft- --
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-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
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-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
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--                                                                          --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception,   --
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-- version 3.1, as published by the Free Software Foundation.               --
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--                                                                          --
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-- You should have received a copy of the GNU General Public License and    --
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-- a copy of the GCC Runtime Library Exception along with this program;     --
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-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
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-- <http://www.gnu.org/licenses/>.                                          --
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--                                                                          --
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-- GNAT was originally developed  by the GNAT team at  New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc.      --
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--                                                                          --
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------------------------------------------------------------------------------
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--  This is the OpenVMS version of this package
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package body Ada.Directories.Validity is
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   Max_Number_Of_Characters : constant := 39;
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   Max_Path_Length          : constant := 1_024;
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   Invalid_Character : constant array (Character) of Boolean :=
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                         ('a' .. 'z' => False,
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                          'A' .. 'Z' => False,
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                          '0' .. '9' => False,
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                          '_' | '$' | '-' | '.' => False,
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                          others => True);
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   ---------------------------------
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   -- Is_Path_Name_Case_Sensitive --
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   ---------------------------------
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   function Is_Path_Name_Case_Sensitive return Boolean is
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   begin
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      return False;
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   end Is_Path_Name_Case_Sensitive;
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   ------------------------
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   -- Is_Valid_Path_Name --
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   ------------------------
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   function Is_Valid_Path_Name (Name : String) return Boolean is
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      First     : Positive := Name'First;
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      Last      : Positive;
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      Dot_Found : Boolean := False;
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   begin
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      --  A valid path (directory) name cannot be empty, and cannot contain
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      --  more than 1024 characters. Directories can be ".", ".." or be simple
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      --  name without extensions.
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      if Name'Length = 0 or else Name'Length > Max_Path_Length then
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         return False;
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      else
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         loop
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            --  Look for the start of the next directory or file name
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            while First <= Name'Last and then Name (First) = '/' loop
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               First := First + 1;
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            end loop;
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            --  If all directories/file names are OK, return True
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            exit when First > Name'Last;
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            Last := First;
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            Dot_Found := False;
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            --  Look for the end of the directory/file name
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            while Last < Name'Last loop
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               exit when Name (Last + 1) = '/';
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               Last := Last + 1;
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               if Name (Last) = '.' then
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                  Dot_Found := True;
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               end if;
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            end loop;
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            --  If name include a dot, it can only be ".", ".." or the last
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            --  file name.
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            if Dot_Found then
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               if Name (First .. Last) /= "." and then
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                  Name (First .. Last) /= ".."
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               then
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                  return Last = Name'Last
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                    and then Is_Valid_Simple_Name (Name (First .. Last));
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               end if;
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            --  Check if the directory/file name is valid
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            elsif not Is_Valid_Simple_Name (Name (First .. Last)) then
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                  return False;
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            end if;
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            --  Move to the next name
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            First := Last + 1;
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         end loop;
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      end if;
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      --  If Name follows the rules, then it is valid
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      return True;
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   end Is_Valid_Path_Name;
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   --------------------------
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   -- Is_Valid_Simple_Name --
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   --------------------------
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   function Is_Valid_Simple_Name (Name : String) return Boolean is
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      In_Extension         : Boolean := False;
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      Number_Of_Characters : Natural := 0;
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   begin
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      --  A file name cannot be empty, and cannot have more than 39 characters
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      --  before or after a single '.'.
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      if Name'Length = 0 then
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         return False;
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      else
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         --  Check each character for validity
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         for J in Name'Range loop
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            if Invalid_Character (Name (J)) then
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               return False;
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            elsif Name (J) = '.' then
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               --  Name cannot contain several dots
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               if In_Extension then
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                  return False;
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               else
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                  --  Reset the number of characters to count the characters
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                  --  of the extension.
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                  In_Extension := True;
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                  Number_Of_Characters := 0;
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               end if;
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            else
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               --  Check that the number of character is not too large
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               Number_Of_Characters := Number_Of_Characters + 1;
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               if Number_Of_Characters > Max_Number_Of_Characters then
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                  return False;
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               end if;
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            end if;
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         end loop;
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      end if;
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      --  If the rules are followed, then it is valid
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      return True;
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   end Is_Valid_Simple_Name;
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   -------------
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   -- OpenVMS --
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   -------------
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   function OpenVMS return Boolean is
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   begin
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      return True;
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   end OpenVMS;
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   -------------
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   -- Windows --
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   -------------
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   function Windows return Boolean is
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   begin
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      return False;
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   end Windows;
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end Ada.Directories.Validity;

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