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------------------------------------------------------------------------------ -- -- -- GNAT COMPILER COMPONENTS -- -- -- -- G N A T . D I R E C T O R Y _ O P E R A T I O N S -- -- -- -- S p e c -- -- -- -- Copyright (C) 1998-2010, AdaCore -- -- -- -- 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. -- -- -- ------------------------------------------------------------------------------ -- Directory operations -- This package provides routines for manipulating directories. A directory -- can be treated as a file, using open and close routines, and a scanning -- routine is provided for iterating through the entries in a directory. -- See also child package GNAT.Directory_Operations.Iteration -- Note: support on OpenVMS is limited to the support of Unix-style -- directory names (OpenVMS native directory format is not supported). -- Read individual entries for more specific notes on OpenVMS support. with System; with Ada.Strings.Maps; package GNAT.Directory_Operations is subtype Dir_Name_Str is String; -- A subtype used in this package to represent string values that are -- directory names. A directory name is a prefix for files that appear -- with in the directory. This means that for UNIX systems, the string -- includes a final '/', and for DOS-like systems, it includes a final -- '\' character. It can also include drive letters if the operating -- system provides for this. The final '/' or '\' in a Dir_Name_Str is -- optional when passed as a procedure or function in parameter. -- On OpenVMS, only Unix style path names are supported, not VMS style, -- but the directory and file names are not case sensitive. type Dir_Type is limited private; -- A value used to reference a directory. Conceptually this value includes -- the identity of the directory, and a sequential position within it. Null_Dir : constant Dir_Type; -- Represent the value for an uninitialized or closed directory Directory_Error : exception; -- Exception raised if the directory cannot be opened, read, closed, -- created or if it is not possible to change the current execution -- environment directory. Dir_Separator : constant Character; -- Running system default directory separator -------------------------------- -- Basic Directory operations -- -------------------------------- procedure Change_Dir (Dir_Name : Dir_Name_Str); -- Changes the working directory of the current execution environment -- to the directory named by Dir_Name. Raises Directory_Error if Dir_Name -- does not exist. procedure Make_Dir (Dir_Name : Dir_Name_Str); -- Create a new directory named Dir_Name. Raises Directory_Error if -- Dir_Name cannot be created. procedure Remove_Dir (Dir_Name : Dir_Name_Str; Recursive : Boolean := False); -- Remove the directory named Dir_Name. If Recursive is set to True, then -- Remove_Dir removes all the subdirectories and files that are in -- Dir_Name. Raises Directory_Error if Dir_Name cannot be removed. function Get_Current_Dir return Dir_Name_Str; -- Returns the current working directory for the execution environment procedure Get_Current_Dir (Dir : out Dir_Name_Str; Last : out Natural); -- Returns the current working directory for the execution environment -- The name is returned in Dir_Name. Last is the index in Dir_Name such -- that Dir_Name (Last) is the last character written. If Dir_Name is -- too small for the directory name, the name will be truncated before -- being copied to Dir_Name. ------------------------- -- Pathname Operations -- ------------------------- subtype Path_Name is String; -- All routines using Path_Name handle both styles (UNIX and DOS) of -- directory separators (either slash or back slash). function Dir_Name (Path : Path_Name) return Dir_Name_Str; -- Returns directory name for Path. This is similar to the UNIX dirname -- command. Everything after the last directory separator is removed. If -- there is no directory separator the current working directory is -- returned. Note that the contents of Path is case-sensitive on -- systems that have case-sensitive file names (like Unix), and -- non-case-sensitive on systems where the file system is also non- -- case-sensitive (such as Windows, and OpenVMS). function Base_Name (Path : Path_Name; Suffix : String := "") return String; -- Any directory prefix is removed. A directory prefix is defined as -- text up to and including the last directory separator character in -- the input string. In addition if Path ends with the string given for -- Suffix, then it is also removed. Note that Suffix here can be an -- arbitrary string (it is not required to be a file extension). This -- is equivalent to the UNIX basename command. The following rule is -- always true: -- -- 'Path' and 'Dir_Name (Path) & Dir_Separator & Base_Name (Path)' -- represent the same file. -- -- The comparison of Suffix is case-insensitive on systems such as Windows -- and VMS where the file search is case-insensitive (e.g. on such systems, -- Base_Name ("/Users/AdaCore/BB12.patch", ".Patch") returns "BB12"). -- -- Note that the index bounds of the result match the corresponding indexes -- in the Path string (you cannot assume that the lower bound of the -- returned string is one). function File_Extension (Path : Path_Name) return String; -- Return the file extension. This is defined as the string after the -- last dot, including the dot itself. For example, if the file name -- is "file1.xyz.adq", then the returned value would be ".adq". If no -- dot is present in the file name, or the last character of the file -- name is a dot, then the null string is returned. function File_Name (Path : Path_Name) return String; -- Returns the file name and the file extension if present. It removes all -- path information. This is equivalent to Base_Name with default Extension -- value. type Path_Style is (UNIX, DOS, System_Default); function Format_Pathname (Path : Path_Name; Style : Path_Style := System_Default) return Path_Name; -- Removes all double directory separator and converts all '\' to '/' if -- Style is UNIX and converts all '/' to '\' if Style is set to DOS. This -- function will help to provide a consistent naming scheme running for -- different environments. If style is set to System_Default the routine -- will use the default directory separator on the running environment. -- -- The Style argument indicates the syntax to be used for path names: -- -- UNIX -- Use '/' as the directory separator. The default on Unix systems -- and on OpenVMS. -- -- DOS -- Use '\' as the directory separator. The default on Windows. -- -- System_Default -- Use the default style for the current system type Environment_Style is (UNIX, DOS, Both, System_Default); function Expand_Path (Path : Path_Name; Mode : Environment_Style := System_Default) return Path_Name; -- Returns Path with environment variables (or logical names on OpenVMS) -- replaced by the current environment variable value. For example, -- $HOME/mydir will be replaced by /home/joe/mydir if $HOME environment -- variable is set to /home/joe and Mode is UNIX. If an environment -- variable does not exists the variable will be replaced by the empty -- string. Two dollar or percent signs are replaced by a single -- dollar/percent sign. Note that a variable must start with a letter. -- -- The Mode argument indicates the recognized syntax for environment -- variables as follows: -- -- UNIX -- Environment variables and OpenVMS logical names use $ as prefix and -- can use curly brackets as in ${HOME}/mydir. If there is no closing -- curly bracket for an opening one then no translation is done, so for -- example ${VAR/toto is returned as ${VAR/toto. The use of {} brackets -- is required if the environment variable name contains other than -- alphanumeric characters. -- -- DOS -- Environment variables uses % as prefix and suffix (e.g. %HOME%/dir). -- The name DOS refer to "DOS-like" environment. This includes all -- Windows systems. -- -- Both -- Recognize both forms described above. -- -- System_Default -- Uses either UNIX on Unix and OpenVMS systems, or DOS on Windows, -- depending on the running environment. What about other OS's??? --------------- -- Iterators -- --------------- procedure Open (Dir : out Dir_Type; Dir_Name : Dir_Name_Str); -- Opens the directory named by Dir_Name and returns a Dir_Type value -- that refers to this directory, and is positioned at the first entry. -- Raises Directory_Error if Dir_Name cannot be accessed. In that case -- Dir will be set to Null_Dir. procedure Close (Dir : in out Dir_Type); -- Closes the directory stream referred to by Dir. After calling Close -- Is_Open will return False. Dir will be set to Null_Dir. -- Raises Directory_Error if Dir has not be opened (Dir = Null_Dir). function Is_Open (Dir : Dir_Type) return Boolean; -- Returns True if Dir is open, or False otherwise procedure Read (Dir : Dir_Type; Str : out String; Last : out Natural); -- Reads the next entry from the directory and sets Str to the name -- of that entry. Last is the index in Str such that Str (Last) is the -- last character written. Last is 0 when there are no more files in the -- directory. If Str is too small for the file name, the file name will -- be truncated before being copied to Str. The list of files returned -- includes directories in systems providing a hierarchical directory -- structure, including . (the current directory) and .. (the parent -- directory) in systems providing these entries. The directory is -- returned in target-OS form. Raises Directory_Error if Dir has not -- be opened (Dir = Null_Dir). function Read_Is_Thread_Safe return Boolean; -- Indicates if procedure Read is thread safe. On systems where the -- target system supports this functionality, Read is thread safe, -- and this function returns True (e.g. this will be the case on any -- UNIX or UNIX-like system providing a correct implementation of the -- function readdir_r). If the system cannot provide a thread safe -- implementation of Read, then this function returns False. private type Dir_Type_Value is new System.Address; -- Low-level address directory structure as returned by opendir in C -- -- Note that we used to define this type in the body of this package, -- but this was causing troubles in the context of .NET code generation -- (because Taft amendment types are not fully implemented and cause -- undefined references to the class), so we moved the type declaration -- to the spec's private part, which is no problem in any case here. type Dir_Type is access Dir_Type_Value; Null_Dir : constant Dir_Type := null; pragma Import (C, Dir_Separator, "__gnat_dir_separator"); Dir_Seps : constant Ada.Strings.Maps.Character_Set := Ada.Strings.Maps.To_Set ("/\"); -- UNIX and DOS style directory separators end GNAT.Directory_Operations;
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