1 ------------------------------------------------------------------------------
3 -- GNAT RUN-TIME COMPONENTS --
5 -- A D A . D I R E C T O R I E S . V A L I D I T Y --
10 -- Copyright (C) 2004 Free Software Foundation, Inc. --
12 -- GNAT is free software; you can redistribute it and/or modify it under --
13 -- terms of the GNU General Public License as published by the Free Soft- --
14 -- ware Foundation; either version 2, or (at your option) any later ver- --
15 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
16 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
17 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
18 -- for more details. You should have received a copy of the GNU General --
19 -- Public License distributed with GNAT; see file COPYING. If not, write --
20 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
21 -- MA 02111-1307, USA. --
23 -- As a special exception, if other files instantiate generics from this --
24 -- unit, or you link this unit with other files to produce an executable, --
25 -- this unit does not by itself cause the resulting executable to be --
26 -- covered by the GNU General Public License. This exception does not --
27 -- however invalidate any other reasons why the executable file might be --
28 -- covered by the GNU Public License. --
30 -- GNAT was originally developed by the GNAT team at New York University. --
31 -- Extensive contributions were provided by Ada Core Technologies Inc. --
33 ------------------------------------------------------------------------------
35 -- This is the OpenVMS version of this package
37 package body Ada.Directories.Validity is
39 Max_Number_Of_Characters : constant := 39;
40 Max_Path_Length : constant := 1_024;
42 Invalid_Character : constant array (Character) of Boolean :=
45 '_' | '$' | '-' | '.' => False,
48 ---------------------------------
49 -- Is_Path_Name_Case_Sensitive --
50 ---------------------------------
52 function Is_Path_Name_Case_Sensitive return Boolean is
55 end Is_Path_Name_Case_Sensitive;
57 ------------------------
58 -- Is_Valid_Path_Name --
59 ------------------------
61 function Is_Valid_Path_Name (Name : String) return Boolean is
62 First : Positive := Name'First;
64 Dot_Found : Boolean := False;
67 -- A valid path (directory) name cannot be empty, and cannot contain
68 -- more than 1024 characters. Directories can be ".", ".." or be simple
69 -- name without extensions.
71 if Name'Length = 0 or else Name'Length > Max_Path_Length then
76 -- Look for the start of the next directory or file name
78 while First <= Name'Last and then Name (First) = '/' loop
82 -- If all directories/file names are OK, return True
84 exit when First > Name'Last;
89 -- Look for the end of the directory/file name
91 while Last < Name'Last loop
92 exit when Name (Last + 1) = '/';
95 if Name (Last) = '.' then
100 -- If name include a dot, it can only be ".", ".." or a the last
104 if Name (First .. Last) /= "." and then
105 Name (First .. Last) /= ".."
107 return Last = Name'Last
108 and then Is_Valid_Simple_Name (Name (First .. Last));
112 -- Check if the directory/file name is valid
114 elsif not Is_Valid_Simple_Name (Name (First .. Last)) then
118 -- Move to the next name
124 -- If Name follows the rules, then it is valid
127 end Is_Valid_Path_Name;
129 --------------------------
130 -- Is_Valid_Simple_Name --
131 --------------------------
133 function Is_Valid_Simple_Name (Name : String) return Boolean is
134 In_Extension : Boolean := False;
135 Number_Of_Characters : Natural := 0;
138 -- A file name cannot be empty, and cannot have more than 39 characters
139 -- before or after a single '.'.
141 if Name'Length = 0 then
145 -- Check each character for validity
147 for J in Name'Range loop
148 if Invalid_Character (Name (J)) then
151 elsif Name (J) = '.' then
153 -- Name cannot contain several dots
159 -- Reset the number of characters to count the characters
162 In_Extension := True;
163 Number_Of_Characters := 0;
167 -- Check that the number of character is not too large
169 Number_Of_Characters := Number_Of_Characters + 1;
171 if Number_Of_Characters > Max_Number_Of_Characters then
178 -- If the rules are followed, then it is valid
181 end Is_Valid_Simple_Name;
183 end Ada.Directories.Validity;