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------------------------------------------------------------------------------ -- -- -- GNAT RUN-TIME COMPONENTS -- -- -- -- A D A . D I R E C T O R I E S -- -- -- -- S p e c -- -- -- -- Copyright (C) 2004-2009, Free Software Foundation, Inc. -- -- -- -- This specification is derived for use with GNAT from AI-00248, which is -- -- expected to be a part of a future expected revised Ada Reference Manual. -- -- The copyright notice above, and the license provisions that follow apply -- -- solely to the contents of the part following the private keyword. -- -- -- -- 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. -- -- -- ------------------------------------------------------------------------------ -- Ada 2005: Implementation of Ada.Directories (AI95-00248). Note that this -- unit is available without -gnat05. That seems reasonable, since you only -- get it if you explicitly ask for it. -- External files may be classified as directories, special files, or ordinary -- files. A directory is an external file that is a container for files on -- the target system. A special file is an external file that cannot be -- created or read by a predefined Ada Input-Output package. External files -- that are not special files or directories are called ordinary files. -- A file name is a string identifying an external file. Similarly, a -- directory name is a string identifying a directory. The interpretation of -- file names and directory names is implementation-defined. -- The full name of an external file is a full specification of the name of -- the file. If the external environment allows alternative specifications of -- the name (for example, abbreviations), the full name should not use such -- alternatives. A full name typically will include the names of all of -- directories that contain the item. The simple name of an external file is -- the name of the item, not including any containing directory names. Unless -- otherwise specified, a file name or directory name parameter to a -- predefined Ada input-output subprogram can be a full name, a simple name, -- or any other form of name supported by the implementation. -- The default directory is the directory that is used if a directory or -- file name is not a full name (that is, when the name does not fully -- identify all of the containing directories). -- A directory entry is a single item in a directory, identifying a single -- external file (including directories and special files). -- For each function that returns a string, the lower bound of the returned -- value is 1. with Ada.Calendar; with Ada.Finalization; with Ada.IO_Exceptions; with Ada.Strings.Unbounded; package Ada.Directories is ----------------------------------- -- Directory and File Operations -- ----------------------------------- function Current_Directory return String; -- Returns the full directory name for the current default directory. The -- name returned shall be suitable for a future call to Set_Directory. -- The exception Use_Error is propagated if a default directory is not -- supported by the external environment. procedure Set_Directory (Directory : String); -- Sets the current default directory. The exception Name_Error is -- propagated if the string given as Directory does not identify an -- existing directory. The exception Use_Error is propagated if the -- external environment does not support making Directory (in the absence -- of Name_Error) a default directory. procedure Create_Directory (New_Directory : String; Form : String := ""); -- Creates a directory with name New_Directory. The Form parameter can be -- used to give system-dependent characteristics of the directory; the -- interpretation of the Form parameter is implementation-defined. A null -- string for Form specifies the use of the default options of the -- implementation of the new directory. The exception Name_Error is -- propagated if the string given as New_Directory does not allow the -- identification of a directory. The exception Use_Error is propagated if -- the external environment does not support the creation of a directory -- with the given name (in the absence of Name_Error) and form. procedure Delete_Directory (Directory : String); -- Deletes an existing empty directory with name Directory. The exception -- Name_Error is propagated if the string given as Directory does not -- identify an existing directory. The exception Use_Error is propagated -- if the external environment does not support the deletion of the -- directory (or some portion of its contents) with the given name (in the -- absence of Name_Error). procedure Create_Path (New_Directory : String; Form : String := ""); -- Creates zero or more directories with name New_Directory. Each -- non-existent directory named by New_Directory is created. For example, -- on a typical Unix system, Create_Path ("/usr/me/my"); would create -- directory "me" in directory "usr", then create directory "my" in -- directory "me". The Form can be used to give system-dependent -- characteristics of the directory; the interpretation of the Form -- parameter is implementation-defined. A null string for Form specifies -- the use of the default options of the implementation of the new -- directory. The exception Name_Error is propagated if the string given -- as New_Directory does not allow the identification of any directory. -- The exception Use_Error is propagated if the external environment does -- not support the creation of any directories with the given name (in the -- absence of Name_Error) and form. procedure Delete_Tree (Directory : String); -- Deletes an existing directory with name Directory. The directory and -- all of its contents (possibly including other directories) are deleted. -- The exception Name_Error is propagated if the string given as Directory -- does not identify an existing directory. The exception Use_Error is -- propagated if the external environment does not support the deletion of -- the directory or some portion of its contents with the given name (in -- the absence of Name_Error). If Use_Error is propagated, it is -- unspecified if a portion of the contents of the directory are deleted. procedure Delete_File (Name : String); -- Deletes an existing ordinary or special file with Name. The exception -- Name_Error is propagated if the string given as Name does not identify -- an existing ordinary or special external file. The exception Use_Error -- is propagated if the external environment does not support the deletion -- of the file with the given name (in the absence of Name_Error). procedure Rename (Old_Name, New_Name : String); -- Renames an existing external file (including directories) with Old_Name -- to New_Name. The exception Name_Error is propagated if the string given -- as Old_Name does not identify an existing external file. The exception -- Use_Error is propagated if the external environment does not support the -- renaming of the file with the given name (in the absence of Name_Error). -- In particular, Use_Error is propagated if a file or directory already -- exists with New_Name. procedure Copy_File (Source_Name : String; Target_Name : String; Form : String := ""); -- Copies the contents of the existing external file with Source_Name -- to Target_Name. The resulting external file is a duplicate of the source -- external file. The Form can be used to give system-dependent -- characteristics of the resulting external file; the interpretation of -- the Form parameter is implementation-defined. Exception Name_Error is -- propagated if the string given as Source_Name does not identify an -- existing external ordinary or special file or if the string given as -- Target_Name does not allow the identification of an external file. -- The exception Use_Error is propagated if the external environment does -- not support the creating of the file with the name given by Target_Name -- and form given by Form, or copying of the file with the name given by -- Source_Name (in the absence of Name_Error). ---------------------------------------- -- File and directory name operations -- ---------------------------------------- function Full_Name (Name : String) return String; -- Returns the full name corresponding to the file name specified by Name. -- The exception Name_Error is propagated if the string given as Name does -- not allow the identification of an external file (including directories -- and special files). function Simple_Name (Name : String) return String; -- Returns the simple name portion of the file name specified by Name. The -- exception Name_Error is propagated if the string given as Name does not -- allow the identification of an external file (including directories and -- special files). function Containing_Directory (Name : String) return String; -- Returns the name of the containing directory of the external file -- (including directories) identified by Name. If more than one directory -- can contain Name, the directory name returned is implementation-defined. -- The exception Name_Error is propagated if the string given as Name does -- not allow the identification of an external file. The exception -- Use_Error is propagated if the external file does not have a containing -- directory. function Extension (Name : String) return String; -- Returns the extension name corresponding to Name. The extension name is -- a portion of a simple name (not including any separator characters), -- typically used to identify the file class. If the external environment -- does not have extension names, then the null string is returned. -- The exception Name_Error is propagated if the string given as Name does -- not allow the identification of an external file. function Base_Name (Name : String) return String; -- Returns the base name corresponding to Name. The base name is the -- remainder of a simple name after removing any extension and extension -- separators. The exception Name_Error is propagated if the string given -- as Name does not allow the identification of an external file -- (including directories and special files). function Compose (Containing_Directory : String := ""; Name : String; Extension : String := "") return String; -- Returns the name of the external file with the specified -- Containing_Directory, Name, and Extension. If Extension is the null -- string, then Name is interpreted as a simple name; otherwise Name is -- interpreted as a base name. The exception Name_Error is propagated if -- the string given as Containing_Directory is not null and does not allow -- the identification of a directory, or if the string given as Extension -- is not null and is not a possible extension, or if the string given as -- Name is not a possible simple name (if Extension is null) or base name -- (if Extension is non-null). -------------------------------- -- File and directory queries -- -------------------------------- type File_Kind is (Directory, Ordinary_File, Special_File); -- The type File_Kind represents the kind of file represented by an -- external file or directory. type File_Size is range 0 .. Long_Long_Integer'Last; -- The type File_Size represents the size of an external file function Exists (Name : String) return Boolean; -- Returns True if external file represented by Name exists, and False -- otherwise. The exception Name_Error is propagated if the string given as -- Name does not allow the identification of an external file (including -- directories and special files). function Kind (Name : String) return File_Kind; -- Returns the kind of external file represented by Name. The exception -- Name_Error is propagated if the string given as Name does not allow the -- identification of an existing external file. function Size (Name : String) return File_Size; -- Returns the size of the external file represented by Name. The size of -- an external file is the number of stream elements contained in the file. -- If the external file is discontiguous (not all elements exist), the -- result is implementation-defined. If the external file is not an -- ordinary file, the result is implementation-defined. The exception -- Name_Error is propagated if the string given as Name does not allow the -- identification of an existing external file. The exception -- Constraint_Error is propagated if the file size is not a value of type -- File_Size. function Modification_Time (Name : String) return Ada.Calendar.Time; -- Returns the time that the external file represented by Name was most -- recently modified. If the external file is not an ordinary file, the -- result is implementation-defined. The exception Name_Error is propagated -- if the string given as Name does not allow the identification of an -- existing external file. The exception Use_Error is propagated if the -- external environment does not support the reading the modification time -- of the file with the name given by Name (in the absence of Name_Error). ------------------------- -- Directory Searching -- ------------------------- type Directory_Entry_Type is limited private; -- The type Directory_Entry_Type represents a single item in a directory. -- These items can only be created by the Get_Next_Entry procedure in this -- package. Information about the item can be obtained from the functions -- declared in this package. A default initialized object of this type is -- invalid; objects returned from Get_Next_Entry are valid. type Filter_Type is array (File_Kind) of Boolean; -- The type Filter_Type specifies which directory entries are provided from -- a search operation. If the Directory component is True, directory -- entries representing directories are provided. If the Ordinary_File -- component is True, directory entries representing ordinary files are -- provided. If the Special_File component is True, directory entries -- representing special files are provided. type Search_Type is limited private; -- The type Search_Type contains the state of a directory search. A -- default-initialized Search_Type object has no entries available -- (More_Entries returns False). procedure Start_Search (Search : in out Search_Type; Directory : String; Pattern : String; Filter : Filter_Type := (others => True)); -- Starts a search in the directory entry in the directory named by -- Directory for entries matching Pattern. Pattern represents a file name -- matching pattern. If Pattern is null, all items in the directory are -- matched; otherwise, the interpretation of Pattern is implementation- -- defined. Only items which match Filter will be returned. After a -- successful call on Start_Search, the object Search may have entries -- available, but it may have no entries available if no files or -- directories match Pattern and Filter. The exception Name_Error is -- propagated if the string given by Directory does not identify an -- existing directory, or if Pattern does not allow the identification of -- any possible external file or directory. The exception Use_Error is -- propagated if the external environment does not support the searching -- of the directory with the given name (in the absence of Name_Error). procedure End_Search (Search : in out Search_Type); -- Ends the search represented by Search. After a successful call on -- End_Search, the object Search will have no entries available. Note -- that it is not necessary to call End_Search if the call to Start_Search -- was unsuccessful and raised an exception (but it is harmless to make -- the call in this case). function More_Entries (Search : Search_Type) return Boolean; -- Returns True if more entries are available to be returned by a call -- to Get_Next_Entry for the specified search object, and False otherwise. procedure Get_Next_Entry (Search : in out Search_Type; Directory_Entry : out Directory_Entry_Type); -- Returns the next Directory_Entry for the search described by Search that -- matches the pattern and filter. If no further matches are available, -- Status_Error is raised. It is implementation-defined as to whether the -- results returned by this routine are altered if the contents of the -- directory are altered while the Search object is valid (for example, by -- another program). The exception Use_Error is propagated if the external -- environment does not support continued searching of the directory -- represented by Search. procedure Search (Directory : String; Pattern : String; Filter : Filter_Type := (others => True); Process : not null access procedure (Directory_Entry : Directory_Entry_Type)); -- Searches in the directory named by Directory for entries matching -- Pattern. The subprogram designated by Process is called with each -- matching entry in turn. Pattern represents a pattern for matching file -- names. If Pattern is null, all items in the directory are matched; -- otherwise, the interpretation of Pattern is implementation-defined. -- Only items that match Filter will be returned. The exception Name_Error -- is propagated if the string given by Directory does not identify -- an existing directory, or if Pattern does not allow the identification -- of any possible external file or directory. The exception Use_Error is -- propagated if the external environment does not support the searching -- of the directory with the given name (in the absence of Name_Error). ------------------------------------- -- Operations on Directory Entries -- ------------------------------------- function Simple_Name (Directory_Entry : Directory_Entry_Type) return String; -- Returns the simple external name of the external file (including -- directories) represented by Directory_Entry. The format of the name -- returned is implementation-defined. The exception Status_Error is -- propagated if Directory_Entry is invalid. function Full_Name (Directory_Entry : Directory_Entry_Type) return String; -- Returns the full external name of the external file (including -- directories) represented by Directory_Entry. The format of the name -- returned is implementation-defined. The exception Status_Error is -- propagated if Directory_Entry is invalid. function Kind (Directory_Entry : Directory_Entry_Type) return File_Kind; -- Returns the kind of external file represented by Directory_Entry. The -- exception Status_Error is propagated if Directory_Entry is invalid. function Size (Directory_Entry : Directory_Entry_Type) return File_Size; -- Returns the size of the external file represented by Directory_Entry. -- The size of an external file is the number of stream elements contained -- in the file. If the external file is discontiguous (not all elements -- exist), the result is implementation-defined. If the external file -- represented by Directory_Entry is not an ordinary file, the result is -- implementation-defined. The exception Status_Error is propagated if -- Directory_Entry is invalid. The exception Constraint_Error is propagated -- if the file size is not a value of type File_Size. function Modification_Time (Directory_Entry : Directory_Entry_Type) return Ada.Calendar.Time; -- Returns the time that the external file represented by Directory_Entry -- was most recently modified. If the external file represented by -- Directory_Entry is not an ordinary file, the result is -- implementation-defined. The exception Status_Error is propagated if -- Directory_Entry is invalid. The exception Use_Error is propagated if -- the external environment does not support the reading the modification -- time of the file represented by Directory_Entry. ---------------- -- Exceptions -- ---------------- Status_Error : exception renames Ada.IO_Exceptions.Status_Error; Name_Error : exception renames Ada.IO_Exceptions.Name_Error; Use_Error : exception renames Ada.IO_Exceptions.Use_Error; Device_Error : exception renames Ada.IO_Exceptions.Device_Error; private type Directory_Entry_Type is record Is_Valid : Boolean := False; Simple : Ada.Strings.Unbounded.Unbounded_String; Full : Ada.Strings.Unbounded.Unbounded_String; Kind : File_Kind := Ordinary_File; end record; -- The type Search_Data is defined in the body, so that the spec does not -- depend on packages of the GNAT hierarchy. type Search_Data; type Search_Ptr is access Search_Data; -- Search_Type need to be a controlled type, because it includes component -- of type Dir_Type (in GNAT.Directory_Operations) that need to be closed -- (if opened) during finalization. The component need to be an access -- value, because Search_Data is not fully defined in the spec. type Search_Type is new Ada.Finalization.Controlled with record Value : Search_Ptr; end record; procedure Finalize (Search : in out Search_Type); -- Close the directory, if opened, and deallocate Value procedure End_Search (Search : in out Search_Type) renames Finalize; end Ada.Directories;
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