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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;