gcc/ada/a-direct.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                        --
   3 --                         GNAT RUN-TIME COMPONENTS                         --
   4 --                                                                          --
   5 --                      A D A . D I R E C T O R I E S                       --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --          Copyright (C) 2004-2007, Free Software Foundation, Inc.         --
  10 --                                                                          --
  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.       --
  15 --                                                                          --
  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 2,  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.  See the GNU General Public License --
  22 -- for  more details.  You should have  received  a copy of the GNU General --
  23 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  24 -- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
  25 -- Boston, MA 02110-1301, USA.                                              --
  26 --                                                                          --
  27 -- As a special exception,  if other files  instantiate  generics from this --
  28 -- unit, or you link  this unit with other files  to produce an executable, --
  29 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  30 -- covered  by the  GNU  General  Public  License.  This exception does not --
  31 -- however invalidate  any other reasons why  the executable file  might be --
  32 -- covered by the  GNU Public License.                                      --
  33 --                                                                          --
  34 -- GNAT was originally developed  by the GNAT team at  New York University. --
  35 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  36 --                                                                          --
  37 ------------------------------------------------------------------------------
  38
  39 --  Ada 2005: Implementation of Ada.Directories (AI95-00248). Note that this
  40 --  unit is available without -gnat05. That seems reasonable, since you only
  41 --  get it if you explicitly ask for it.
  42
  43 --  External files may be classified as directories, special files, or ordinary
  44 --  files. A directory is an external file that is a container for files on
  45 --  the target system. A special file is an external file that cannot be
  46 --  created or read by a predefined Ada Input-Output package. External files
  47 --  that are not special files or directories are called ordinary files.
  48
  49 --  A file name is a string identifying an external file. Similarly, a
  50 --  directory name is a string identifying a directory. The interpretation of
  51 --  file names and directory names is implementation-defined.
  52
  53 --  The full name of an external file is a full specification of the name of
  54 --  the file. If the external environment allows alternative specifications of
  55 --  the name (for example, abbreviations), the full name should not use such
  56 --  alternatives. A full name typically will include the names of all of
  57 --  directories that contain the item. The simple name of an external file is
  58 --  the name of the item, not including any containing directory names. Unless
  59 --  otherwise specified, a file name or directory name parameter to a
  60 --  predefined Ada input-output subprogram can be a full name, a simple name,
  61 --  or any other form of name supported by the implementation.
  62
  63 --  The default directory is the directory that is used if a directory or
  64 --  file name is not a full name (that is, when the name does not fully
  65 --  identify all of the containing directories).
  66
  67 --  A directory entry is a single item in a directory, identifying a single
  68 --  external file (including directories and special files).
  69
  70 --  For each function that returns a string, the lower bound of the returned
  71 --  value is 1.
  72
  73 with Ada.Calendar;
  74 with Ada.Finalization;
  75 with Ada.IO_Exceptions;
  76 with Ada.Strings.Unbounded;
  77
  78 package Ada.Directories is
  79
  80    -----------------------------------
  81    -- Directory and File Operations --
  82    -----------------------------------
  83
  84    function Current_Directory return String;
  85    --  Returns the full directory name for the current default directory. The
  86    --  name returned shall be suitable for a future call to Set_Directory.
  87    --  The exception Use_Error is propagated if a default directory is not
  88    --  supported by the external environment.
  89
  90    procedure Set_Directory (Directory : String);
  91    --  Sets the current default directory. The exception Name_Error is
  92    --  propagated if the string given as Directory does not identify an
  93    --  existing directory. The exception Use_Error is propagated if the
  94    --  external environment does not support making Directory (in the absence
  95    --  of Name_Error) a default directory.
  96
  97    procedure Create_Directory
  98      (New_Directory : String;
  99       Form          : String := "");
 100    --  Creates a directory with name New_Directory. The Form parameter can be
 101    --  used to give system-dependent characteristics of the directory; the
 102    --  interpretation of the Form parameter is implementation-defined. A null
 103    --  string for Form specifies the use of the default options of the
 104    --  implementation of the new directory. The exception Name_Error is
 105    --  propagated if the string given as New_Directory does not allow the
 106    --  identification of a directory. The exception Use_Error is propagated if
 107    --  the external environment does not support the creation of a directory
 108    --  with the given name (in the absence of Name_Error) and form.
 109
 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).
 117
 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.
 134
 135    procedure Delete_Tree (Directory : String);
 136    --  Deletes an existing directory with name Directory. The directory and
 137    --  all of its contents (possibly including other directories) are deleted.
 138    --  The exception Name_Error is propagated if the string given as Directory
 139    --  does not identify an existing directory. The exception Use_Error is
 140    --  propagated if the external environment does not support the deletion of
 141    --  the directory or some portion of its contents with the given name (in
 142    --  the absence of Name_Error). If Use_Error is propagated, it is
 143    --  unspecified if a portion of the contents of the directory are deleted.
 144
 145    procedure Delete_File (Name : String);
 146    --  Deletes an existing ordinary or special file with Name. The exception
 147    --  Name_Error is propagated if the string given as Name does not identify
 148    --  an existing ordinary or special external file. The exception Use_Error
 149    --  is propagated if the external environment does not support the deletion
 150    --  of the file with the given name (in the absence of Name_Error).
 151
 152    procedure Rename (Old_Name, New_Name : String);
 153    --  Renames an existing external file (including directories) with Old_Name
 154    --  to New_Name. The exception Name_Error is propagated if the string given
 155    --  as Old_Name does not identify an existing external file. The exception
 156    --  Use_Error is propagated if the external environment does not support the
 157    --  renaming of the file with the given name (in the absence of Name_Error).
 158    --  In particular, Use_Error is propagated if a file or directory already
 159    --  exists with New_Name.
 160
 161    procedure Copy_File
 162      (Source_Name   : String;
 163       Target_Name   : String;
 164       Form          : String := "");
 165    --  Copies the contents of the existing external file with Source_Name
 166    --  to Target_Name. The resulting external file is a duplicate of the source
 167    --  external file. The Form can be used to give system-dependent
 168    --  characteristics of the resulting external file; the interpretation of
 169    --  the Form parameter is implementation-defined. Exception Name_Error is
 170    --  propagated if the string given as Source_Name does not identify an
 171    --  existing external ordinary or special file or if the string given as
 172    --  Target_Name does not allow the identification of an external file.
 173    --  The exception Use_Error is propagated if the external environment does
 174    --  not support the creating of the file with the name given by Target_Name
 175    --  and form given by Form, or copying of the file with the name given by
 176    --  Source_Name (in the absence of Name_Error).
 177
 178    ----------------------------------------
 179    -- File and directory name operations --
 180    ----------------------------------------
 181
 182    function Full_Name (Name : String) return String;
 183    --  Returns the full name corresponding to the file name specified by Name.
 184    --  The exception Name_Error is propagated if the string given as Name does
 185    --  not allow the identification of an external file (including directories
 186    --  and special files).
 187
 188    function Simple_Name (Name : String) return String;
 189    --  Returns the simple name portion of the file name specified by Name. The
 190    --  exception Name_Error is propagated if the string given as Name does not
 191    --  allow the identification of an external file (including directories and
 192    --  special files).
 193
 194    function Containing_Directory (Name : String) return String;
 195    --  Returns the name of the containing directory of the external file
 196    --  (including directories) identified by Name. If more than one directory
 197    --  can contain Name, the directory name returned is implementation-defined.
 198    --  The exception Name_Error is propagated if the string given as Name does
 199    --  not allow the identification of an external file. The exception
 200    --  Use_Error is propagated if the external file does not have a containing
 201    --  directory.
 202
 203    function Extension (Name : String) return String;
 204    --  Returns the extension name corresponding to Name. The extension name is
 205    --  a portion of a simple name (not including any separator characters),
 206    --  typically used to identify the file class. If the external environment
 207    --  does not have extension names, then the null string is returned.
 208    --  The exception Name_Error is propagated if the string given as Name does
 209    --  not allow the identification of an external file.
 210
 211    function Base_Name (Name : String) return String;
 212    --  Returns the base name corresponding to Name. The base name is the
 213    --  remainder of a simple name after removing any extension and extension
 214    --  separators. The exception Name_Error is propagated if the string given
 215    --  as Name does not allow the identification of an external file
 216    --  (including directories and special files).
 217
 218    function Compose
 219      (Containing_Directory : String := "";
 220       Name                 : String;
 221       Extension            : String := "") return String;
 222    --  Returns the name of the external file with the specified
 223    --  Containing_Directory, Name, and Extension. If Extension is the null
 224    --  string, then Name is interpreted as a simple name; otherwise Name is
 225    --  interpreted as a base name. The exception Name_Error is propagated if
 226    --  the string given as Containing_Directory is not null and does not allow
 227    --  the identification of a directory, or if the string given as Extension
 228    --  is not null and is not a possible extension, or if the string given as
 229    --  Name is not a possible simple name (if Extension is null) or base name
 230    --  (if Extension is non-null).
 231
 232    --------------------------------
 233    -- File and directory queries --
 234    --------------------------------
 235
 236    type File_Kind is (Directory, Ordinary_File, Special_File);
 237    --  The type File_Kind represents the kind of file represented by an
 238    --  external file or directory.
 239
 240    type File_Size is range 0 .. Long_Long_Integer'Last;
 241    --  The type File_Size represents the size of an external file
 242
 243    function Exists (Name : String) return Boolean;
 244    --  Returns True if external file represented by Name exists, and False
 245    --  otherwise. The exception Name_Error is propagated if the string given as
 246    --  Name does not allow the identification of an external file (including
 247    --  directories and special files).
 248
 249    function Kind (Name : String) return File_Kind;
 250    --  Returns the kind of external file represented by Name. The exception
 251    --  Name_Error is propagated if the string given as Name does not allow the
 252    --  identification of an existing external file.
 253
 254    function Size (Name : String) return File_Size;
 255    --  Returns the size of the external file represented by Name. The size of
 256    --  an external file is the number of stream elements contained in the file.
 257    --  If the external file is discontiguous (not all elements exist), the
 258    --  result is implementation-defined. If the external file is not an
 259    --  ordinary file, the result is implementation-defined. The exception
 260    --  Name_Error is propagated if the string given as Name does not allow the
 261    --  identification of an existing external file. The exception
 262    --  Constraint_Error is propagated if the file size is not a value of type
 263    --  File_Size.
 264
 265    function Modification_Time (Name : String) return Ada.Calendar.Time;
 266    --  Returns the time that the external file represented by Name was most
 267    --  recently modified. If the external file is not an ordinary file, the
 268    --  result is implementation-defined. The exception Name_Error is propagated
 269    --  if the string given as Name does not allow the identification of an
 270    --  existing external file. The exception Use_Error is propagated if the
 271    --  external environment does not support the reading the modification time
 272    --  of the file with the name given by Name (in the absence of Name_Error).
 273
 274    -------------------------
 275    -- Directory Searching --
 276    -------------------------
 277
 278    type Directory_Entry_Type is limited private;
 279    --  The type Directory_Entry_Type represents a single item in a directory.
 280    --  These items can only be created by the Get_Next_Entry procedure in this
 281    --  package. Information about the item can be obtained from the functions
 282    --  declared in this package. A default initialized object of this type is
 283    --  invalid; objects returned from Get_Next_Entry are valid.
 284
 285    type Filter_Type is array (File_Kind) of Boolean;
 286    --  The type Filter_Type specifies which directory entries are provided from
 287    --  a search operation. If the Directory component is True, directory
 288    --  entries representing directories are provided. If the Ordinary_File
 289    --  component is True, directory entries representing ordinary files are
 290    --  provided. If the Special_File component is True, directory entries
 291    --  representing special files are provided.
 292
 293    type Search_Type is limited private;
 294    --  The type Search_Type contains the state of a directory search. A
 295    --  default-initialized Search_Type object has no entries available
 296    --  (More_Entries returns False).
 297
 298    procedure Start_Search
 299      (Search    : in out Search_Type;
 300       Directory : String;
 301       Pattern   : String;
 302       Filter    : Filter_Type := (others => True));
 303    --  Starts a search in the directory entry in the directory named by
 304    --  Directory for entries matching Pattern. Pattern represents a file name
 305    --  matching pattern. If Pattern is null, all items in the directory are
 306    --  matched; otherwise, the interpretation of Pattern is implementation-
 307    --  defined. Only items which match Filter will be returned. After a
 308    --  successful call on Start_Search, the object Search may have entries
 309    --  available, but it may have no entries available if no files or
 310    --  directories match Pattern and Filter. The exception Name_Error is
 311    --  propagated if the string given by Directory does not identify an
 312    --  existing directory, or if Pattern does not allow the identification of
 313    --  any possible external file or directory. The exception Use_Error is
 314    --  propagated if the external environment does not support the searching
 315    --  of the directory with the given name (in the absence of Name_Error).
 316
 317    procedure End_Search (Search : in out Search_Type);
 318    --  Ends the search represented by Search. After a successful call on
 319    --  End_Search, the object Search will have no entries available. Note
 320    --  that is is not necessary to call End_Search if the call to Start_Search
 321    --  was unsuccessful and raised an exception (but it is harmless to make
 322    --  the call in this case).
 323
 324    function More_Entries (Search : Search_Type) return Boolean;
 325    --  Returns True if more entries are available to be returned by a call
 326    --  to Get_Next_Entry for the specified search object, and False otherwise.
 327
 328    procedure Get_Next_Entry
 329      (Search          : in out Search_Type;
 330       Directory_Entry : out Directory_Entry_Type);
 331    --  Returns the next Directory_Entry for the search described by Search that
 332    --  matches the pattern and filter. If no further matches are available,
 333    --  Status_Error is raised. It is implementation-defined as to whether the
 334    --  results returned by this routine are altered if the contents of the
 335    --  directory are altered while the Search object is valid (for example, by
 336    --  another program). The exception Use_Error is propagated if the external
 337    --  environment does not support continued searching of the directory
 338    --  represented by Search.
 339
 340    procedure Search
 341      (Directory : String;
 342       Pattern   : String;
 343       Filter    : Filter_Type := (others => True);
 344       Process   : not null access procedure
 345                                     (Directory_Entry : Directory_Entry_Type));
 346    --  Searches in the directory named by Directory for entries matching
 347    --  Pattern. The subprogram designated by Process is called with each
 348    --  matching entry in turn. Pattern represents a pattern for matching file
 349    --  names. If Pattern is null, all items in the directory are matched;
 350    --  otherwise, the interpretation of Pattern is implementation-defined.
 351    --  Only items that match Filter will be returned. The exception Name_Error
 352    --  is propagated if the string given by Directory does not identify
 353    --  an existing directory, or if Pattern does not allow the identification
 354    --  of any possible external file or directory. The exception Use_Error is
 355    --  propagated if the external environment does not support the searching
 356    --  of the directory with the given name (in the absence of Name_Error).
 357
 358    -------------------------------------
 359    -- Operations on Directory Entries --
 360    -------------------------------------
 361
 362    function Simple_Name (Directory_Entry : Directory_Entry_Type) return String;
 363    --  Returns the simple external name of the external file (including
 364    --  directories) represented by Directory_Entry. The format of the name
 365    --  returned is implementation-defined. The exception Status_Error is
 366    --  propagated if Directory_Entry is invalid.
 367
 368    function Full_Name (Directory_Entry : Directory_Entry_Type) return String;
 369    --  Returns the full external name of the external file (including
 370    --  directories) represented by Directory_Entry. The format of the name
 371    --  returned is implementation-defined. The exception Status_Error is
 372    --  propagated if Directory_Entry is invalid.
 373
 374    function Kind (Directory_Entry : Directory_Entry_Type) return File_Kind;
 375    --  Returns the kind of external file represented by Directory_Entry. The
 376    --  exception Status_Error is propagated if Directory_Entry is invalid.
 377
 378    function Size (Directory_Entry : Directory_Entry_Type) return File_Size;
 379    --  Returns the size of the external file represented by Directory_Entry.
 380    --  The size of an external file is the number of stream elements contained
 381    --  in the file. If the external file is discontiguous (not all elements
 382    --  exist), the result is implementation-defined. If the external file
 383    --  represented by Directory_Entry is not an ordinary file, the result is
 384    --  implementation-defined. The exception Status_Error is propagated if
 385    --  Directory_Entry is invalid. The exception Constraint_Error is propagated
 386    --  if the file size is not a value of type File_Size.
 387
 388    function Modification_Time
 389      (Directory_Entry : Directory_Entry_Type) return Ada.Calendar.Time;
 390    --  Returns the time that the external file represented by Directory_Entry
 391    --  was most recently modified. If the external file represented by
 392    --  Directory_Entry is not an ordinary file, the result is
 393    --  implementation-defined. The exception Status_Error is propagated if
 394    --  Directory_Entry is invalid. The exception Use_Error is propagated if
 395    --  the external environment does not support the reading the modification
 396    --  time of the file represented by Directory_Entry.
 397
 398    ----------------
 399    -- Exceptions --
 400    ----------------
 401
 402    Status_Error : exception renames Ada.IO_Exceptions.Status_Error;
 403    Name_Error   : exception renames Ada.IO_Exceptions.Name_Error;
 404    Use_Error    : exception renames Ada.IO_Exceptions.Use_Error;
 405    Device_Error : exception renames Ada.IO_Exceptions.Device_Error;
 406
 407 private
 408    type Directory_Entry_Type is record
 409       Is_Valid : Boolean := False;
 410       Simple   : Ada.Strings.Unbounded.Unbounded_String;
 411       Full     : Ada.Strings.Unbounded.Unbounded_String;
 412       Kind     : File_Kind := Ordinary_File;
 413    end record;
 414
 415    --  The type Search_Data is defined in the body, so that the spec does not
 416    --  depend on packages of the GNAT hierarchy.
 417
 418    type Search_Data;
 419    type Search_Ptr is access Search_Data;
 420
 421    --  Search_Type need to be a controlled type, because it includes component
 422    --  of type Dir_Type (in GNAT.Directory_Operations) that need to be closed
 423    --  (if opened) during finalization. The component need to be an access
 424    --  value, because Search_Data is not fully defined in the spec.
 425
 426    type Search_Type is new Ada.Finalization.Controlled with record
 427       Value : Search_Ptr;
 428    end record;
 429
 430    procedure Finalize (Search : in out Search_Type);
 431    --  Close the directory, if opened, and deallocate Value
 432
 433    procedure End_Search (Search : in out Search_Type) renames Finalize;
 434
 435 end Ada.Directories;