1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
5 -- G N A T . D I R E C T O R Y _ O P E R A T I O N S --
10 -- Copyright (C) 1998-2001 Ada Core Technologies, Inc. --
12 -- GNAT is free software; you can redistribute it and/or modify it under --
13 -- terms of the GNU General Public License as published by the Free Soft- --
14 -- ware Foundation; either version 2, or (at your option) any later ver- --
15 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
16 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
17 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
18 -- for more details. You should have received a copy of the GNU General --
19 -- Public License distributed with GNAT; see file COPYING. If not, write --
20 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
21 -- MA 02111-1307, USA. --
23 -- As a special exception, if other files instantiate generics from this --
24 -- unit, or you link this unit with other files to produce an executable, --
25 -- this unit does not by itself cause the resulting executable to be --
26 -- covered by the GNU General Public License. This exception does not --
27 -- however invalidate any other reasons why the executable file might be --
28 -- covered by the GNU Public License. --
30 -- GNAT is maintained by Ada Core Technologies Inc (http://www.gnat.com). --
32 ------------------------------------------------------------------------------
34 with Ada.Characters.Handling;
35 with Ada.Strings.Fixed;
36 with Ada.Strings.Maps;
37 with Unchecked_Deallocation;
38 with Unchecked_Conversion;
39 with System; use System;
43 package body GNAT.Directory_Operations is
47 type Dir_Type_Value is new System.Address;
48 -- This is the low-level address directory structure as returned by the C
52 Unchecked_Deallocation (Dir_Type_Value, Dir_Type);
60 Suffix : String := "")
63 function Get_File_Names_Case_Sensitive return Integer;
65 (C, Get_File_Names_Case_Sensitive,
66 "__gnat_get_file_names_case_sensitive");
68 Case_Sensitive_File_Name : constant Boolean :=
69 Get_File_Names_Case_Sensitive = 1;
73 Suffix : String := "")
75 -- This function does the job. The only difference between Basename
76 -- and Base_Name (the parent function) is that the former is case
77 -- sensitive, while the latter is not. Path and Suffix are adjusted
78 -- appropriately before calling Basename under platforms where the
79 -- file system is not case sensitive.
87 Suffix : String := "")
90 Cut_Start : Natural :=
92 (Path, Dir_Seps, Going => Strings.Backward);
96 -- Cut_Start point to the first basename character
99 Cut_Start := Path'First;
102 Cut_Start := Cut_Start + 1;
105 -- Cut_End point to the last basename character.
107 Cut_End := Path'Last;
109 -- If basename ends with Suffix, adjust Cut_End.
112 and then Path (Path'Last - Suffix'Length + 1 .. Cut_End) = Suffix
114 Cut_End := Path'Last - Suffix'Length;
117 Check_For_Standard_Dirs : declare
118 Offset : constant Integer := Path'First - Base_Name.Path'First;
119 BN : constant String :=
120 Base_Name.Path (Cut_Start - Offset .. Cut_End - Offset);
121 -- Here we use Base_Name.Path to keep the original casing
124 if BN = "." or else BN = ".." then
128 and then Characters.Handling.Is_Letter (BN (BN'First))
129 and then BN (BN'First + 1) = ':'
131 -- We have a DOS drive letter prefix, remove it
133 return BN (BN'First + 2 .. BN'Last);
138 end Check_For_Standard_Dirs;
141 -- Start processing for Base_Name
144 if Case_Sensitive_File_Name then
145 return Basename (Path, Suffix);
149 (Characters.Handling.To_Lower (Path),
150 Characters.Handling.To_Lower (Suffix));
158 procedure Change_Dir (Dir_Name : Dir_Name_Str) is
159 C_Dir_Name : String := Dir_Name & ASCII.NUL;
161 function chdir (Dir_Name : String) return Integer;
162 pragma Import (C, chdir, "chdir");
165 if chdir (C_Dir_Name) /= 0 then
166 raise Directory_Error;
174 procedure Close (Dir : in out Dir_Type) is
176 function closedir (Directory : System.Address) return Integer;
177 pragma Import (C, closedir, "closedir");
182 if not Is_Open (Dir) then
183 raise Directory_Error;
186 Discard := closedir (System.Address (Dir.all));
194 function Dir_Name (Path : Path_Name) return Dir_Name_Str is
195 Last_DS : constant Natural :=
197 (Path, Dir_Seps, Going => Strings.Backward);
202 -- There is no directory separator, returns current working directory
204 return "." & Dir_Separator;
207 return Path (Path'First .. Last_DS);
215 function Expand_Path (Path : Path_Name) return String is
217 Result : OS_Lib.String_Access := new String (1 .. 200);
218 Result_Last : Natural := 0;
220 procedure Append (C : Character);
221 procedure Append (S : String);
224 procedure Double_Result_Size;
225 -- Reallocate Result, doubling its size
227 procedure Read (K : in out Positive);
228 -- Update Result while reading current Path starting at position K. If
229 -- a variable is found, call Var below.
231 procedure Var (K : in out Positive);
232 -- Translate variable name starting at position K with the associated
233 -- environment value.
239 procedure Append (C : Character) is
241 if Result_Last = Result'Last then
245 Result_Last := Result_Last + 1;
246 Result (Result_Last) := C;
249 procedure Append (S : String) is
251 while Result_Last + S'Length - 1 > Result'Last loop
255 Result (Result_Last + 1 .. Result_Last + S'Length) := S;
256 Result_Last := Result_Last + S'Length;
259 ------------------------
260 -- Double_Result_Size --
261 ------------------------
263 procedure Double_Result_Size is
264 New_Result : constant OS_Lib.String_Access :=
265 new String (1 .. 2 * Result'Last);
268 New_Result (1 .. Result_Last) := Result (1 .. Result_Last);
269 OS_Lib.Free (Result);
270 Result := New_Result;
271 end Double_Result_Size;
277 procedure Read (K : in out Positive) is
279 For_All_Characters : loop
280 if Path (K) = '$' then
282 -- Could be a variable
284 if K < Path'Last then
286 if Path (K + 1) = '$' then
288 -- Not a variable after all, this is a double $, just
289 -- insert one in the result string.
295 -- Let's parse the variable
302 -- We have an ending $ sign
308 -- This is a standard character, just add it to the result
313 -- Skip to next character
317 exit For_All_Characters when K > Path'Last;
318 end loop For_All_Characters;
325 procedure Var (K : in out Positive) is
329 if Path (K) = '{' then
331 -- Look for closing } (curly bracket).
337 exit when Path (E) = '}' or else E = Path'Last;
340 if Path (E) = '}' then
342 -- OK found, translate with environment value
345 Env : OS_Lib.String_Access :=
346 OS_Lib.Getenv (Path (K + 1 .. E - 1));
354 -- No closing curly bracket, not a variable after all or a
355 -- syntax error, ignore it, insert string as-is.
358 Append (Path (K .. E));
362 -- The variable name is everything from current position to first
363 -- non letter/digit character.
367 -- Check that first chartacter is a letter
369 if Characters.Handling.Is_Letter (Path (E)) then
373 exit Var_Name when E > Path'Last;
375 if Characters.Handling.Is_Letter (Path (E))
376 or else Characters.Handling.Is_Digit (Path (E))
387 Env : OS_Lib.String_Access := OS_Lib.Getenv (Path (K .. E));
395 -- This is not a variable after all
406 -- Start of processing for Expand_Path
410 K : Positive := Path'First;
416 Returned_Value : constant String := Result (1 .. Result_Last);
419 OS_Lib.Free (Result);
420 return Returned_Value;
429 function File_Extension (Path : Path_Name) return String is
432 (Path, Dir_Seps, Going => Strings.Backward);
441 Dot := Strings.Fixed.Index (Path (First .. Path'Last),
443 Going => Strings.Backward);
445 if Dot = 0 or else Dot = Path'Last then
448 return Path (Dot .. Path'Last);
456 function File_Name (Path : Path_Name) return String is
458 return Base_Name (Path);
461 ---------------------
462 -- Format_Pathname --
463 ---------------------
465 function Format_Pathname
467 Style : Path_Style := System_Default)
470 N_Path : String := Path;
471 K : Positive := N_Path'First;
472 Prev_Dirsep : Boolean := False;
475 for J in Path'Range loop
477 if Strings.Maps.Is_In (Path (J), Dir_Seps) then
478 if not Prev_Dirsep then
480 when UNIX => N_Path (K) := '/';
481 when DOS => N_Path (K) := '\';
482 when System_Default => N_Path (K) := Dir_Separator;
491 N_Path (K) := Path (J);
493 Prev_Dirsep := False;
497 return N_Path (N_Path'First .. K - 1);
500 ---------------------
501 -- Get_Current_Dir --
502 ---------------------
505 pragma Import (C, Max_Path, "__gnat_max_path_len");
507 function Get_Current_Dir return Dir_Name_Str is
508 Current_Dir : String (1 .. Max_Path + 1);
512 Get_Current_Dir (Current_Dir, Last);
513 return Current_Dir (1 .. Last);
516 procedure Get_Current_Dir (Dir : out Dir_Name_Str; Last : out Natural) is
517 Path_Len : Natural := Max_Path;
518 Buffer : String (Dir'First .. Dir'First + Max_Path + 1);
520 procedure Local_Get_Current_Dir
521 (Dir : System.Address;
522 Length : System.Address);
523 pragma Import (C, Local_Get_Current_Dir, "__gnat_get_current_dir");
526 Local_Get_Current_Dir (Buffer'Address, Path_Len'Address);
528 if Dir'Length > Path_Len then
529 Last := Dir'First + Path_Len - 1;
534 Dir (Buffer'First .. Last) := Buffer (Buffer'First .. Last);
541 function Is_Open (Dir : Dir_Type) return Boolean is
543 return Dir /= Null_Dir
544 and then System.Address (Dir.all) /= System.Null_Address;
551 procedure Make_Dir (Dir_Name : Dir_Name_Str) is
552 C_Dir_Name : String := Dir_Name & ASCII.NUL;
554 function mkdir (Dir_Name : String) return Integer;
555 pragma Import (C, mkdir, "__gnat_mkdir");
558 if mkdir (C_Dir_Name) /= 0 then
559 raise Directory_Error;
569 Dir_Name : Dir_Name_Str)
571 C_File_Name : String := Dir_Name & ASCII.NUL;
575 return Dir_Type_Value;
576 pragma Import (C, opendir, "opendir");
579 Dir := new Dir_Type_Value'(opendir (C_File_Name));
581 if not Is_Open (Dir) then
584 raise Directory_Error;
593 (Dir : in out Dir_Type;
597 Filename_Addr : Address;
598 Filename_Len : Integer;
600 Buffer : array (0 .. 1024) of Character;
601 -- 1024 is the value of FILENAME_MAX in stdio.h
603 function readdir_gnat
604 (Directory : System.Address;
605 Buffer : System.Address)
606 return System.Address;
607 pragma Import (C, readdir_gnat, "__gnat_readdir");
609 function strlen (S : Address) return Integer;
610 pragma Import (C, strlen, "strlen");
613 if not Is_Open (Dir) then
614 raise Directory_Error;
618 readdir_gnat (System.Address (Dir.all), Buffer'Address);
620 if Filename_Addr = System.Null_Address then
625 Filename_Len := strlen (Filename_Addr);
627 if Str'Length > Filename_Len then
628 Last := Str'First + Filename_Len - 1;
634 subtype Path_String is String (1 .. Filename_Len);
635 type Path_String_Access is access Path_String;
637 function Address_To_Access is new
640 Target => Path_String_Access);
642 Path_Access : Path_String_Access := Address_To_Access (Filename_Addr);
645 for J in Str'First .. Last loop
646 Str (J) := Path_Access (J - Str'First + 1);
651 -------------------------
652 -- Read_Is_Thread_Sage --
653 -------------------------
655 function Read_Is_Thread_Safe return Boolean is
657 function readdir_is_thread_safe return Integer;
659 (C, readdir_is_thread_safe, "__gnat_readdir_is_thread_safe");
662 return (readdir_is_thread_safe /= 0);
663 end Read_Is_Thread_Safe;
669 procedure Remove_Dir (Dir_Name : Dir_Name_Str) is
670 C_Dir_Name : String := Dir_Name & ASCII.NUL;
672 procedure rmdir (Dir_Name : String);
673 pragma Import (C, rmdir, "rmdir");
679 end GNAT.Directory_Operations;