176 lines
6.3 KiB
Ada
176 lines
6.3 KiB
Ada
------------------------------------------------------------------------------
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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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-- (Windows Version) --
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-- --
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-- Copyright (C) 2004-2015, 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 Windows version of this package
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with Ada.Characters.Latin_1; use Ada.Characters.Latin_1;
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package body Ada.Directories.Validity is
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Invalid_Character : constant array (Character) of Boolean :=
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(NUL .. US | '\' => True,
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'/' | ':' | '*' | '?' => True,
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'"' | '<' | '>' | '|' => True,
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DEL => True,
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others => False);
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-- Note that a valid file-name or path-name is implementation defined.
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-- To support UTF-8 file and directory names, we do not want to be too
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-- restrictive here.
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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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Start : Positive := Name'First;
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Last : Natural;
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begin
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-- A path name cannot be empty, cannot contain more than 256 characters,
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-- cannot contain invalid characters and each directory/file name need
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-- to be valid.
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if Name'Length = 0 or else Name'Length > 256 then
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return False;
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else
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-- A drive letter may be specified at the beginning
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if Name'Length >= 2
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and then Name (Start + 1) = ':'
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and then
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(Name (Start) in 'A' .. 'Z' or else Name (Start) in 'a' .. 'z')
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then
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Start := Start + 2;
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-- A drive letter followed by a colon and followed by nothing or
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-- by a relative path is an ambiguous path name on Windows, so we
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-- don't accept it.
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if Start > Name'Last
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or else (Name (Start) /= '/' and then Name (Start) /= '\')
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then
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return False;
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end if;
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end if;
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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 Start <= Name'Last
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and then (Name (Start) = '\' or Name (Start) = '/')
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loop
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Start := Start + 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 Start > Name'Last;
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Last := Start;
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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) = '\' or Name (Last + 1) = '/';
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Last := Last + 1;
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end loop;
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-- Check if the directory/file name is valid
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if not Is_Valid_Simple_Name (Name (Start .. 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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Start := Last + 1;
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end loop;
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end if;
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-- If Name follows the rules, 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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Only_Spaces : Boolean;
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begin
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-- A file name cannot be empty, cannot contain more than 256 characters,
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-- and cannot contain invalid characters.
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if Name'Length = 0 or else Name'Length > 256 then
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return False;
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-- Name length is OK
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else
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Only_Spaces := True;
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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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Only_Spaces := False;
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end if;
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end loop;
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-- If no invalid chars, and not all spaces, file name is valid
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return not Only_Spaces;
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end if;
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end Is_Valid_Simple_Name;
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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 True;
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end Windows;
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end Ada.Directories.Validity;
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