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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;
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