| ------------------------------------------------------------------------------ |
| -- -- |
| -- 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 -- |
| -- -- |
| -- $Revision$ |
| -- -- |
| -- Copyright (C) 1998-2001 Ada Core Technologies, Inc. -- |
| -- -- |
| -- 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 2, 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. See the GNU General Public License -- |
| -- for more details. You should have received a copy of the GNU General -- |
| -- Public License distributed with GNAT; see file COPYING. If not, write -- |
| -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, -- |
| -- MA 02111-1307, USA. -- |
| -- -- |
| -- As a special exception, if other files instantiate generics from this -- |
| -- unit, or you link this unit with other files to produce an executable, -- |
| -- this unit does not by itself cause the resulting executable to be -- |
| -- covered by the GNU General Public License. This exception does not -- |
| -- however invalidate any other reasons why the executable file might be -- |
| -- covered by the GNU Public License. -- |
| -- -- |
| -- GNAT is maintained by Ada Core Technologies Inc (http://www.gnat.com). -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| -- 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 |
| |
| 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. |
| |
| 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); |
| -- Remove the directory named 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. |
| |
| function Base_Name |
| (Path : Path_Name; |
| Suffix : String := "") |
| return String; |
| -- Any directory prefix is removed. If Suffix is non-empty and is a |
| -- suffix of Path, it is removed. This is equivalent to the UNIX basename |
| -- command. The following rule is always true: |
| -- |
| -- 'Path' and 'Dir_Name (Path) & Directory_Separator & Base_Name (Path)' |
| -- represent the same file. |
| -- |
| -- This function is not case-sensitive on systems that have a non |
| -- case-sensitive file system like Windows, OS/2 and VMS. |
| |
| function File_Extension (Path : Path_Name) return String; |
| -- Return the file extension. This is the string after the last dot |
| -- character in File_Name (Path). It returns the empty string if no |
| -- extension is found. The returned value does contains the file |
| -- extension separator (dot character). |
| |
| 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 Normalize_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. |
| |
| function Expand_Path (Path : Path_Name) return Path_Name; |
| -- Returns Path with environment variables (string preceded by a dollar |
| -- sign) 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. The variable can be surrounded by the |
| -- characters '{' and '}' (curly bracket) if needed as in ${HOME}/mydir. |
| -- If an environment variable does not exists the variable will be replaced |
| -- by the empty string. Two dollar signs are replaced by a single dollar |
| -- sign. Note that a variable must start with a letter. If there is no |
| -- closing curly bracket for an opening one there is no translation done, |
| -- so for example ${VAR/toto is returned as ${VAR/toto. |
| |
| --------------- |
| -- 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 refered 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 : in out 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; |
| 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; |
