File : a-dirval-mingw.adb
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT RUN-TIME COMPONENTS --
4 -- --
5 -- A D A . D I R E C T O R I E S . V A L I D I T Y --
6 -- --
7 -- B o d y --
8 -- (Windows Version) --
9 -- --
10 -- Copyright (C) 2004-2015, Free Software Foundation, Inc. --
11 -- --
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 3, 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. --
18 -- --
19 -- --
20 -- --
21 -- --
22 -- --
23 -- You should have received a copy of the GNU General Public License and --
24 -- a copy of the GCC Runtime Library Exception along with this program; --
25 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
26 -- <http://www.gnu.org/licenses/>. --
27 -- --
28 -- GNAT was originally developed by the GNAT team at New York University. --
29 -- Extensive contributions were provided by Ada Core Technologies Inc. --
30 -- --
31 ------------------------------------------------------------------------------
32
33 -- This is the Windows version of this package
34
35 with Ada.Characters.Latin_1; use Ada.Characters.Latin_1;
36
37 package body Ada.Directories.Validity is
38
39 Invalid_Character : constant array (Character) of Boolean :=
40 (NUL .. US | '\' => True,
41 '/' | ':' | '*' | '?' => True,
42 '"' | '<' | '>' | '|' => True,
43 DEL => True,
44 others => False);
45 -- Note that a valid file-name or path-name is implementation defined.
46 -- To support UTF-8 file and directory names, we do not want to be too
47 -- restrictive here.
48
49 ---------------------------------
50 -- Is_Path_Name_Case_Sensitive --
51 ---------------------------------
52
53 function Is_Path_Name_Case_Sensitive return Boolean is
54 begin
55 return False;
56 end Is_Path_Name_Case_Sensitive;
57
58 ------------------------
59 -- Is_Valid_Path_Name --
60 ------------------------
61
62 function Is_Valid_Path_Name (Name : String) return Boolean is
63 Start : Positive := Name'First;
64 Last : Natural;
65
66 begin
67 -- A path name cannot be empty, cannot contain more than 256 characters,
68 -- cannot contain invalid characters and each directory/file name need
69 -- to be valid.
70
71 if Name'Length = 0 or else Name'Length > 256 then
72 return False;
73
74 else
75 -- A drive letter may be specified at the beginning
76
77 if Name'Length >= 2
78 and then Name (Start + 1) = ':'
79 and then
80 (Name (Start) in 'A' .. 'Z' or else Name (Start) in 'a' .. 'z')
81 then
82 Start := Start + 2;
83
84 -- A drive letter followed by a colon and followed by nothing or
85 -- by a relative path is an ambiguous path name on Windows, so we
86 -- don't accept it.
87
88 if Start > Name'Last
89 or else (Name (Start) /= '/' and then Name (Start) /= '\')
90 then
91 return False;
92 end if;
93 end if;
94
95 loop
96 -- Look for the start of the next directory or file name
97
98 while Start <= Name'Last
99 and then (Name (Start) = '\' or Name (Start) = '/')
100 loop
101 Start := Start + 1;
102 end loop;
103
104 -- If all directories/file names are OK, return True
105
106 exit when Start > Name'Last;
107
108 Last := Start;
109
110 -- Look for the end of the directory/file name
111
112 while Last < Name'Last loop
113 exit when Name (Last + 1) = '\' or Name (Last + 1) = '/';
114 Last := Last + 1;
115 end loop;
116
117 -- Check if the directory/file name is valid
118
119 if not Is_Valid_Simple_Name (Name (Start .. Last)) then
120 return False;
121 end if;
122
123 -- Move to the next name
124
125 Start := Last + 1;
126 end loop;
127 end if;
128
129 -- If Name follows the rules, it is valid
130
131 return True;
132 end Is_Valid_Path_Name;
133
134 --------------------------
135 -- Is_Valid_Simple_Name --
136 --------------------------
137
138 function Is_Valid_Simple_Name (Name : String) return Boolean is
139 Only_Spaces : Boolean;
140
141 begin
142 -- A file name cannot be empty, cannot contain more than 256 characters,
143 -- and cannot contain invalid characters.
144
145 if Name'Length = 0 or else Name'Length > 256 then
146 return False;
147
148 -- Name length is OK
149
150 else
151 Only_Spaces := True;
152 for J in Name'Range loop
153 if Invalid_Character (Name (J)) then
154 return False;
155 elsif Name (J) /= ' ' then
156 Only_Spaces := False;
157 end if;
158 end loop;
159
160 -- If no invalid chars, and not all spaces, file name is valid
161
162 return not Only_Spaces;
163 end if;
164 end Is_Valid_Simple_Name;
165
166 -------------
167 -- Windows --
168 -------------
169
170 function Windows return Boolean is
171 begin
172 return True;
173 end Windows;
174
175 end Ada.Directories.Validity;