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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) 2004-2018, 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 => True,
others => False);
-- Note that a valid file-name or path-name is implementation defined.
-- To support UTF-8 file and directory names, we do not want to be too
-- restrictive here.
---------------------------------
-- 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;
-------------
-- Windows --
-------------
function Windows return Boolean is
begin
return True;
end Windows;
end Ada.Directories.Validity;
|
