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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 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. --
-- --
------------------------------------------------------------------------------
-- 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,
'_' | '$' | '-' | '.' => 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 a 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;
end Ada.Directories.Validity;
|
