1 ------------------------------------------------------------------------------
3 -- GNAT RUN-TIME COMPONENTS --
5 -- A D A . D I R E C T O R I E S --
9 -- Copyright (C) 2004-2010, Free Software Foundation, Inc. --
11 -- This specification is derived for use with GNAT from AI-00248, which is --
12 -- expected to be a part of a future expected revised Ada Reference Manual. --
13 -- The copyright notice above, and the license provisions that follow apply --
14 -- solely to the contents of the part following the private keyword. --
16 -- GNAT is free software; you can redistribute it and/or modify it under --
17 -- terms of the GNU General Public License as published by the Free Soft- --
18 -- ware Foundation; either version 3, or (at your option) any later ver- --
19 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
20 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
21 -- or FITNESS FOR A PARTICULAR PURPOSE. --
23 -- As a special exception under Section 7 of GPL version 3, you are granted --
24 -- additional permissions described in the GCC Runtime Library Exception, --
25 -- version 3.1, as published by the Free Software Foundation. --
27 -- You should have received a copy of the GNU General Public License and --
28 -- a copy of the GCC Runtime Library Exception along with this program; --
29 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
30 -- <http://www.gnu.org/licenses/>. --
32 -- GNAT was originally developed by the GNAT team at New York University. --
33 -- Extensive contributions were provided by Ada Core Technologies Inc. --
35 ------------------------------------------------------------------------------
37 -- Ada 2005: Implementation of Ada.Directories (AI95-00248). Note that this
38 -- unit is available without -gnat05. That seems reasonable, since you only
39 -- get it if you explicitly ask for it.
41 -- External files may be classified as directories, special files, or ordinary
42 -- files. A directory is an external file that is a container for files on
43 -- the target system. A special file is an external file that cannot be
44 -- created or read by a predefined Ada Input-Output package. External files
45 -- that are not special files or directories are called ordinary files.
47 -- A file name is a string identifying an external file. Similarly, a
48 -- directory name is a string identifying a directory. The interpretation of
49 -- file names and directory names is implementation-defined.
51 -- The full name of an external file is a full specification of the name of
52 -- the file. If the external environment allows alternative specifications of
53 -- the name (for example, abbreviations), the full name should not use such
54 -- alternatives. A full name typically will include the names of all of
55 -- directories that contain the item. The simple name of an external file is
56 -- the name of the item, not including any containing directory names. Unless
57 -- otherwise specified, a file name or directory name parameter to a
58 -- predefined Ada input-output subprogram can be a full name, a simple name,
59 -- or any other form of name supported by the implementation.
61 -- The default directory is the directory that is used if a directory or
62 -- file name is not a full name (that is, when the name does not fully
63 -- identify all of the containing directories).
65 -- A directory entry is a single item in a directory, identifying a single
66 -- external file (including directories and special files).
68 -- For each function that returns a string, the lower bound of the returned
72 with Ada.Finalization;
73 with Ada.IO_Exceptions;
74 with Ada.Strings.Unbounded;
76 package Ada.Directories is
78 -----------------------------------
79 -- Directory and File Operations --
80 -----------------------------------
82 function Current_Directory return String;
83 -- Returns the full directory name for the current default directory. The
84 -- name returned shall be suitable for a future call to Set_Directory.
85 -- The exception Use_Error is propagated if a default directory is not
86 -- supported by the external environment.
88 procedure Set_Directory (Directory : String);
89 -- Sets the current default directory. The exception Name_Error is
90 -- propagated if the string given as Directory does not identify an
91 -- existing directory. The exception Use_Error is propagated if the
92 -- external environment does not support making Directory (in the absence
93 -- of Name_Error) a default directory.
95 procedure Create_Directory
96 (New_Directory : String;
98 -- Creates a directory with name New_Directory. The Form parameter can be
99 -- used to give system-dependent characteristics of the directory; the
100 -- interpretation of the Form parameter is implementation-defined. A null
101 -- string for Form specifies the use of the default options of the
102 -- implementation of the new directory. The exception Name_Error is
103 -- propagated if the string given as New_Directory does not allow the
104 -- identification of a directory. The exception Use_Error is propagated if
105 -- the external environment does not support the creation of a directory
106 -- with the given name (in the absence of Name_Error) and form.
108 -- The Form parameter is ignored
110 procedure Delete_Directory (Directory : String);
111 -- Deletes an existing empty directory with name Directory. The exception
112 -- Name_Error is propagated if the string given as Directory does not
113 -- identify an existing directory. The exception Use_Error is propagated
114 -- if the external environment does not support the deletion of the
115 -- directory (or some portion of its contents) with the given name (in the
116 -- absence of Name_Error).
118 procedure Create_Path
119 (New_Directory : String;
120 Form : String := "");
121 -- Creates zero or more directories with name New_Directory. Each
122 -- non-existent directory named by New_Directory is created. For example,
123 -- on a typical Unix system, Create_Path ("/usr/me/my"); would create
124 -- directory "me" in directory "usr", then create directory "my" in
125 -- directory "me". The Form can be used to give system-dependent
126 -- characteristics of the directory; the interpretation of the Form
127 -- parameter is implementation-defined. A null string for Form specifies
128 -- the use of the default options of the implementation of the new
129 -- directory. The exception Name_Error is propagated if the string given
130 -- as New_Directory does not allow the identification of any directory.
131 -- The exception Use_Error is propagated if the external environment does
132 -- not support the creation of any directories with the given name (in the
133 -- absence of Name_Error) and form.
135 -- The Form parameter is ignored
137 procedure Delete_Tree (Directory : String);
138 -- Deletes an existing directory with name Directory. The directory and
139 -- all of its contents (possibly including other directories) are deleted.
140 -- The exception Name_Error is propagated if the string given as Directory
141 -- does not identify an existing directory. The exception Use_Error is
142 -- propagated if the external environment does not support the deletion of
143 -- the directory or some portion of its contents with the given name (in
144 -- the absence of Name_Error). If Use_Error is propagated, it is
145 -- unspecified if a portion of the contents of the directory are deleted.
147 procedure Delete_File (Name : String);
148 -- Deletes an existing ordinary or special file with Name. The exception
149 -- Name_Error is propagated if the string given as Name does not identify
150 -- an existing ordinary or special external file. The exception Use_Error
151 -- is propagated if the external environment does not support the deletion
152 -- of the file with the given name (in the absence of Name_Error).
154 procedure Rename (Old_Name, New_Name : String);
155 -- Renames an existing external file (including directories) with Old_Name
156 -- to New_Name. The exception Name_Error is propagated if the string given
157 -- as Old_Name does not identify an existing external file. The exception
158 -- Use_Error is propagated if the external environment does not support the
159 -- renaming of the file with the given name (in the absence of Name_Error).
160 -- In particular, Use_Error is propagated if a file or directory already
161 -- exists with New_Name.
164 (Source_Name : String;
165 Target_Name : String;
166 Form : String := "");
167 -- Copies the contents of the existing external file with Source_Name to
168 -- Target_Name. The resulting external file is a duplicate of the source
169 -- external file. The Form argument can be used to give system-dependent
170 -- characteristics of the resulting external file; the interpretation of
171 -- the Form parameter is implementation-defined. Exception Name_Error is
172 -- propagated if the string given as Source_Name does not identify an
173 -- existing external ordinary or special file or if the string given as
174 -- Target_Name does not allow the identification of an external file. The
175 -- exception Use_Error is propagated if the external environment does not
176 -- support the creating of the file with the name given by Target_Name and
177 -- form given by Form, or copying of the file with the name given by
178 -- Source_Name (in the absence of Name_Error).
180 -- Interpretation of the Form parameter:
182 -- The Form parameter is case-insensitive
184 -- Two fields are recognized in the Form parameter:
188 -- <value> starts immediately after the character '=' and ends with the
189 -- character immediately preceding the next comma (',') or with the
190 -- last character of the parameter.
192 -- The allowed values for preserve= are:
194 -- no_attributes: Do not try to preserve any file attributes. This
195 -- is the default if no preserve= is found in Form.
197 -- all_attributes: Try to preserve all file attributes (timestamps,
200 -- timestamps: Preserve the timestamp of the copied file, but not
201 -- the other file attributes.
204 -- The allowed values for mode= are:
206 -- copy: Only copy if the destination file does not already
207 -- exist. If it already exists, Copy_File will fail.
209 -- overwrite: Copy the file in all cases. Overwite an already
210 -- existing destination file.
212 -- append: Append the original file to the destination file.
213 -- If the destination file does not exist, the
214 -- destination file is a copy of the source file.
215 -- When mode=append, the field preserve=, if it
216 -- exists, is not taken into account.
218 -- What is the default value for mode=???
220 -- If the Form parameter includes one or both of the fields and the value
221 -- or values are incorrect, Copy_file fails with Use_Error.
223 -- Examples of correct Forms:
224 -- Form => "preserve=no_attributes,mode=overwrite" (the default)
225 -- Form => "mode=append"
226 -- Form => "mode=copy, preserve=all_attributes"
228 -- Examples of incorrect Forms:
229 -- Form => "preserve=junk"
230 -- Form => "mode=internal, preserve=timestamps"
232 ----------------------------------------
233 -- File and directory name operations --
234 ----------------------------------------
236 function Full_Name (Name : String) return String;
237 -- Returns the full name corresponding to the file name specified by Name.
238 -- The exception Name_Error is propagated if the string given as Name does
239 -- not allow the identification of an external file (including directories
240 -- and special files).
242 function Simple_Name (Name : String) return String;
243 -- Returns the simple name portion of the file name specified by Name. The
244 -- exception Name_Error is propagated if the string given as Name does not
245 -- allow the identification of an external file (including directories and
248 function Containing_Directory (Name : String) return String;
249 -- Returns the name of the containing directory of the external file
250 -- (including directories) identified by Name. If more than one directory
251 -- can contain Name, the directory name returned is implementation-defined.
252 -- The exception Name_Error is propagated if the string given as Name does
253 -- not allow the identification of an external file. The exception
254 -- Use_Error is propagated if the external file does not have a containing
257 function Extension (Name : String) return String;
258 -- Returns the extension name corresponding to Name. The extension name is
259 -- a portion of a simple name (not including any separator characters),
260 -- typically used to identify the file class. If the external environment
261 -- does not have extension names, then the null string is returned.
262 -- The exception Name_Error is propagated if the string given as Name does
263 -- not allow the identification of an external file.
265 function Base_Name (Name : String) return String;
266 -- Returns the base name corresponding to Name. The base name is the
267 -- remainder of a simple name after removing any extension and extension
268 -- separators. The exception Name_Error is propagated if the string given
269 -- as Name does not allow the identification of an external file
270 -- (including directories and special files).
273 (Containing_Directory : String := "";
275 Extension : String := "") return String;
276 -- Returns the name of the external file with the specified
277 -- Containing_Directory, Name, and Extension. If Extension is the null
278 -- string, then Name is interpreted as a simple name; otherwise Name is
279 -- interpreted as a base name. The exception Name_Error is propagated if
280 -- the string given as Containing_Directory is not null and does not allow
281 -- the identification of a directory, or if the string given as Extension
282 -- is not null and is not a possible extension, or if the string given as
283 -- Name is not a possible simple name (if Extension is null) or base name
284 -- (if Extension is non-null).
286 --------------------------------
287 -- File and directory queries --
288 --------------------------------
290 type File_Kind is (Directory, Ordinary_File, Special_File);
291 -- The type File_Kind represents the kind of file represented by an
292 -- external file or directory.
294 type File_Size is range 0 .. Long_Long_Integer'Last;
295 -- The type File_Size represents the size of an external file
297 function Exists (Name : String) return Boolean;
298 -- Returns True if external file represented by Name exists, and False
299 -- otherwise. The exception Name_Error is propagated if the string given as
300 -- Name does not allow the identification of an external file (including
301 -- directories and special files).
303 function Kind (Name : String) return File_Kind;
304 -- Returns the kind of external file represented by Name. The exception
305 -- Name_Error is propagated if the string given as Name does not allow the
306 -- identification of an existing external file.
308 function Size (Name : String) return File_Size;
309 -- Returns the size of the external file represented by Name. The size of
310 -- an external file is the number of stream elements contained in the file.
311 -- If the external file is discontiguous (not all elements exist), the
312 -- result is implementation-defined. If the external file is not an
313 -- ordinary file, the result is implementation-defined. The exception
314 -- Name_Error is propagated if the string given as Name does not allow the
315 -- identification of an existing external file. The exception
316 -- Constraint_Error is propagated if the file size is not a value of type
319 function Modification_Time (Name : String) return Ada.Calendar.Time;
320 -- Returns the time that the external file represented by Name was most
321 -- recently modified. If the external file is not an ordinary file, the
322 -- result is implementation-defined. The exception Name_Error is propagated
323 -- if the string given as Name does not allow the identification of an
324 -- existing external file. The exception Use_Error is propagated if the
325 -- external environment does not support the reading the modification time
326 -- of the file with the name given by Name (in the absence of Name_Error).
328 -------------------------
329 -- Directory Searching --
330 -------------------------
332 type Directory_Entry_Type is limited private;
333 -- The type Directory_Entry_Type represents a single item in a directory.
334 -- These items can only be created by the Get_Next_Entry procedure in this
335 -- package. Information about the item can be obtained from the functions
336 -- declared in this package. A default initialized object of this type is
337 -- invalid; objects returned from Get_Next_Entry are valid.
339 type Filter_Type is array (File_Kind) of Boolean;
340 -- The type Filter_Type specifies which directory entries are provided from
341 -- a search operation. If the Directory component is True, directory
342 -- entries representing directories are provided. If the Ordinary_File
343 -- component is True, directory entries representing ordinary files are
344 -- provided. If the Special_File component is True, directory entries
345 -- representing special files are provided.
347 type Search_Type is limited private;
348 -- The type Search_Type contains the state of a directory search. A
349 -- default-initialized Search_Type object has no entries available
350 -- (More_Entries returns False).
352 procedure Start_Search
353 (Search : in out Search_Type;
356 Filter : Filter_Type := (others => True));
357 -- Starts a search in the directory entry in the directory named by
358 -- Directory for entries matching Pattern. Pattern represents a file name
359 -- matching pattern. If Pattern is null, all items in the directory are
360 -- matched; otherwise, the interpretation of Pattern is implementation-
361 -- defined. Only items which match Filter will be returned. After a
362 -- successful call on Start_Search, the object Search may have entries
363 -- available, but it may have no entries available if no files or
364 -- directories match Pattern and Filter. The exception Name_Error is
365 -- propagated if the string given by Directory does not identify an
366 -- existing directory, or if Pattern does not allow the identification of
367 -- any possible external file or directory. The exception Use_Error is
368 -- propagated if the external environment does not support the searching
369 -- of the directory with the given name (in the absence of Name_Error).
371 procedure End_Search (Search : in out Search_Type);
372 -- Ends the search represented by Search. After a successful call on
373 -- End_Search, the object Search will have no entries available. Note
374 -- that it is not necessary to call End_Search if the call to Start_Search
375 -- was unsuccessful and raised an exception (but it is harmless to make
376 -- the call in this case).
378 function More_Entries (Search : Search_Type) return Boolean;
379 -- Returns True if more entries are available to be returned by a call
380 -- to Get_Next_Entry for the specified search object, and False otherwise.
382 procedure Get_Next_Entry
383 (Search : in out Search_Type;
384 Directory_Entry : out Directory_Entry_Type);
385 -- Returns the next Directory_Entry for the search described by Search that
386 -- matches the pattern and filter. If no further matches are available,
387 -- Status_Error is raised. It is implementation-defined as to whether the
388 -- results returned by this routine are altered if the contents of the
389 -- directory are altered while the Search object is valid (for example, by
390 -- another program). The exception Use_Error is propagated if the external
391 -- environment does not support continued searching of the directory
392 -- represented by Search.
397 Filter : Filter_Type := (others => True);
398 Process : not null access procedure
399 (Directory_Entry : Directory_Entry_Type));
400 -- Searches in the directory named by Directory for entries matching
401 -- Pattern. The subprogram designated by Process is called with each
402 -- matching entry in turn. Pattern represents a pattern for matching file
403 -- names. If Pattern is null, all items in the directory are matched;
404 -- otherwise, the interpretation of Pattern is implementation-defined.
405 -- Only items that match Filter will be returned. The exception Name_Error
406 -- is propagated if the string given by Directory does not identify
407 -- an existing directory, or if Pattern does not allow the identification
408 -- of any possible external file or directory. The exception Use_Error is
409 -- propagated if the external environment does not support the searching
410 -- of the directory with the given name (in the absence of Name_Error).
412 -------------------------------------
413 -- Operations on Directory Entries --
414 -------------------------------------
416 function Simple_Name (Directory_Entry : Directory_Entry_Type) return String;
417 -- Returns the simple external name of the external file (including
418 -- directories) represented by Directory_Entry. The format of the name
419 -- returned is implementation-defined. The exception Status_Error is
420 -- propagated if Directory_Entry is invalid.
422 function Full_Name (Directory_Entry : Directory_Entry_Type) return String;
423 -- Returns the full external name of the external file (including
424 -- directories) represented by Directory_Entry. The format of the name
425 -- returned is implementation-defined. The exception Status_Error is
426 -- propagated if Directory_Entry is invalid.
428 function Kind (Directory_Entry : Directory_Entry_Type) return File_Kind;
429 -- Returns the kind of external file represented by Directory_Entry. The
430 -- exception Status_Error is propagated if Directory_Entry is invalid.
432 function Size (Directory_Entry : Directory_Entry_Type) return File_Size;
433 -- Returns the size of the external file represented by Directory_Entry.
434 -- The size of an external file is the number of stream elements contained
435 -- in the file. If the external file is discontiguous (not all elements
436 -- exist), the result is implementation-defined. If the external file
437 -- represented by Directory_Entry is not an ordinary file, the result is
438 -- implementation-defined. The exception Status_Error is propagated if
439 -- Directory_Entry is invalid. The exception Constraint_Error is propagated
440 -- if the file size is not a value of type File_Size.
442 function Modification_Time
443 (Directory_Entry : Directory_Entry_Type) return Ada.Calendar.Time;
444 -- Returns the time that the external file represented by Directory_Entry
445 -- was most recently modified. If the external file represented by
446 -- Directory_Entry is not an ordinary file, the result is
447 -- implementation-defined. The exception Status_Error is propagated if
448 -- Directory_Entry is invalid. The exception Use_Error is propagated if
449 -- the external environment does not support the reading the modification
450 -- time of the file represented by Directory_Entry.
456 Status_Error : exception renames Ada.IO_Exceptions.Status_Error;
457 Name_Error : exception renames Ada.IO_Exceptions.Name_Error;
458 Use_Error : exception renames Ada.IO_Exceptions.Use_Error;
459 Device_Error : exception renames Ada.IO_Exceptions.Device_Error;
462 type Directory_Entry_Type is record
463 Is_Valid : Boolean := False;
464 Simple : Ada.Strings.Unbounded.Unbounded_String;
465 Full : Ada.Strings.Unbounded.Unbounded_String;
466 Kind : File_Kind := Ordinary_File;
469 -- The type Search_Data is defined in the body, so that the spec does not
470 -- depend on packages of the GNAT hierarchy.
473 type Search_Ptr is access Search_Data;
475 -- Search_Type need to be a controlled type, because it includes component
476 -- of type Dir_Type (in GNAT.Directory_Operations) that need to be closed
477 -- (if opened) during finalization. The component need to be an access
478 -- value, because Search_Data is not fully defined in the spec.
480 type Search_Type is new Ada.Finalization.Controlled with record
484 procedure Finalize (Search : in out Search_Type);
485 -- Close the directory, if opened, and deallocate Value
487 procedure End_Search (Search : in out Search_Type) renames Finalize;