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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 --
-- --
-- B o d y --
-- --
-- Copyright (C) 1998-2021, 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. --
-- --
------------------------------------------------------------------------------
with Ada.IO_Exceptions;
with Ada.Characters.Handling;
with Ada.Strings.Fixed;
with Ada.Unchecked_Deallocation;
with Ada.Unchecked_Conversion;
with System; use System;
with System.CRTL; use System.CRTL;
with GNAT.OS_Lib;
package body GNAT.Directory_Operations is
use Ada;
Filename_Max : constant Integer := 1024;
-- 1024 is the value of FILENAME_MAX in stdio.h
procedure Free is new
Ada.Unchecked_Deallocation (Dir_Type_Value, Dir_Type);
On_Windows : constant Boolean := GNAT.OS_Lib.Directory_Separator = '\';
-- An indication that we are on Windows. Used in Get_Current_Dir, to
-- deal with drive letters in the beginning of absolute paths.
---------------
-- Base_Name --
---------------
function Base_Name
(Path : Path_Name;
Suffix : String := "") return String
is
function Get_File_Names_Case_Sensitive return Integer;
pragma Import
(C, Get_File_Names_Case_Sensitive,
"__gnat_get_file_names_case_sensitive");
Case_Sensitive_File_Name : constant Boolean :=
Get_File_Names_Case_Sensitive = 1;
function Basename
(Path : Path_Name;
Suffix : String := "") return String;
-- This function does the job. The only difference between Basename
-- and Base_Name (the parent function) is that the former is case
-- sensitive, while the latter is not. Path and Suffix are adjusted
-- appropriately before calling Basename under platforms where the
-- file system is not case sensitive.
--------------
-- Basename --
--------------
function Basename
(Path : Path_Name;
Suffix : String := "") return String
is
Cut_Start : Natural :=
Strings.Fixed.Index
(Path, Dir_Seps, Going => Strings.Backward);
Cut_End : Natural;
begin
-- Cut_Start point to the first basename character
Cut_Start := (if Cut_Start = 0 then Path'First else Cut_Start + 1);
-- Cut_End point to the last basename character
Cut_End := Path'Last;
-- If basename ends with Suffix, adjust Cut_End
if Suffix /= ""
and then Path (Path'Last - Suffix'Length + 1 .. Cut_End) = Suffix
then
Cut_End := Path'Last - Suffix'Length;
end if;
Check_For_Standard_Dirs : declare
Offset : constant Integer := Path'First - Base_Name.Path'First;
BN : constant String :=
Base_Name.Path (Cut_Start - Offset .. Cut_End - Offset);
-- Here we use Base_Name.Path to keep the original casing
Has_Drive_Letter : constant Boolean :=
OS_Lib.Path_Separator /= ':';
-- If Path separator is not ':' then we are on a DOS based OS
-- where this character is used as a drive letter separator.
begin
if BN = "." or else BN = ".." then
return "";
elsif Has_Drive_Letter
and then BN'Length > 2
and then Characters.Handling.Is_Letter (BN (BN'First))
and then BN (BN'First + 1) = ':'
then
-- We have a DOS drive letter prefix, remove it
return BN (BN'First + 2 .. BN'Last);
else
return BN;
end if;
end Check_For_Standard_Dirs;
end Basename;
-- Start of processing for Base_Name
begin
if Path'Length <= Suffix'Length then
return Path;
end if;
if Case_Sensitive_File_Name then
return Basename (Path, Suffix);
else
return Basename
(Characters.Handling.To_Lower (Path),
Characters.Handling.To_Lower (Suffix));
end if;
end Base_Name;
----------------
-- Change_Dir --
----------------
procedure Change_Dir (Dir_Name : Dir_Name_Str) is
C_Dir_Name : constant String := Dir_Name & ASCII.NUL;
begin
if chdir (C_Dir_Name) /= 0 then
raise Directory_Error;
end if;
end Change_Dir;
-----------
-- Close --
-----------
procedure Close (Dir : in out Dir_Type) is
Discard : Integer;
pragma Warnings (Off, Discard);
function closedir (directory : DIRs) return Integer;
pragma Import (C, closedir, "__gnat_closedir");
begin
if not Is_Open (Dir) then
raise Directory_Error;
end if;
Discard := closedir (DIRs (Dir.all));
Free (Dir);
end Close;
--------------
-- Dir_Name --
--------------
function Dir_Name (Path : Path_Name) return Dir_Name_Str is
Last_DS : constant Natural :=
Strings.Fixed.Index
(Path, Dir_Seps, Going => Strings.Backward);
begin
if Last_DS = 0 then
-- There is no directory separator, returns current working directory
return "." & Dir_Separator;
else
return Path (Path'First .. Last_DS);
end if;
end Dir_Name;
-----------------
-- Expand_Path --
-----------------
function Expand_Path
(Path : Path_Name;
Mode : Environment_Style := System_Default) return Path_Name
is
Environment_Variable_Char : Character;
pragma Import (C, Environment_Variable_Char, "__gnat_environment_char");
Result : OS_Lib.String_Access := new String (1 .. 200);
Result_Last : Natural := 0;
procedure Append (C : Character);
procedure Append (S : String);
-- Append to Result
procedure Double_Result_Size;
-- Reallocate Result, doubling its size
function Is_Var_Prefix (C : Character) return Boolean;
pragma Inline (Is_Var_Prefix);
procedure Read (K : in out Positive);
-- Update Result while reading current Path starting at position K. If
-- a variable is found, call Var below.
procedure Var (K : in out Positive);
-- Translate variable name starting at position K with the associated
-- environment value.
------------
-- Append --
------------
procedure Append (C : Character) is
begin
if Result_Last = Result'Last then
Double_Result_Size;
end if;
Result_Last := Result_Last + 1;
Result (Result_Last) := C;
end Append;
procedure Append (S : String) is
begin
while Result_Last + S'Length - 1 > Result'Last loop
Double_Result_Size;
end loop;
Result (Result_Last + 1 .. Result_Last + S'Length) := S;
Result_Last := Result_Last + S'Length;
end Append;
------------------------
-- Double_Result_Size --
------------------------
procedure Double_Result_Size is
New_Result : constant OS_Lib.String_Access :=
new String (1 .. 2 * Result'Last);
begin
New_Result (1 .. Result_Last) := Result (1 .. Result_Last);
OS_Lib.Free (Result);
Result := New_Result;
end Double_Result_Size;
-------------------
-- Is_Var_Prefix --
-------------------
function Is_Var_Prefix (C : Character) return Boolean is
begin
return (C = Environment_Variable_Char and then Mode = System_Default)
or else
(C = '$' and then (Mode = UNIX or else Mode = Both))
or else
(C = '%' and then (Mode = DOS or else Mode = Both));
end Is_Var_Prefix;
----------
-- Read --
----------
procedure Read (K : in out Positive) is
P : Character;
begin
For_All_Characters : loop
if Is_Var_Prefix (Path (K)) then
P := Path (K);
-- Could be a variable
if K < Path'Last then
if Path (K + 1) = P then
-- Not a variable after all, this is a double $ or %,
-- just insert one in the result string.
Append (P);
K := K + 1;
else
-- Let's parse the variable
Var (K);
end if;
else
-- We have an ending $ or % sign
Append (P);
end if;
else
-- This is a standard character, just add it to the result
Append (Path (K));
end if;
-- Skip to next character
K := K + 1;
exit For_All_Characters when K > Path'Last;
end loop For_All_Characters;
end Read;
---------
-- Var --
---------
procedure Var (K : in out Positive) is
P : constant Character := Path (K);
T : Character;
E : Positive;
begin
K := K + 1;
pragma Annotate (CodePeer, Modified, P);
if P = '%' or else Path (K) = '{' then
-- Set terminator character
if P = '%' then
T := '%';
else
T := '}';
K := K + 1;
end if;
-- Look for terminator character, k point to the first character
-- for the variable name.
E := K;
loop
E := E + 1;
exit when Path (E) = T or else E = Path'Last;
end loop;
if Path (E) = T then
-- OK found, translate with environment value
declare
Env : OS_Lib.String_Access :=
OS_Lib.Getenv (Path (K .. E - 1));
begin
Append (Env.all);
OS_Lib.Free (Env);
end;
else
-- No terminator character, not a variable after all or a
-- syntax error, ignore it, insert string as-is.
Append (P); -- Add prefix character
if T = '}' then -- If we were looking for curly bracket
Append ('{'); -- terminator, add the curly bracket
end if;
Append (Path (K .. E));
end if;
else
-- The variable name is everything from current position to first
-- non letter/digit character.
E := K;
-- Check that first character is a letter
if Characters.Handling.Is_Letter (Path (E)) then
E := E + 1;
Var_Name : loop
exit Var_Name when E > Path'Last;
if Characters.Handling.Is_Letter (Path (E))
or else Characters.Handling.Is_Digit (Path (E))
then
E := E + 1;
else
exit Var_Name;
end if;
end loop Var_Name;
E := E - 1;
declare
Env : OS_Lib.String_Access := OS_Lib.Getenv (Path (K .. E));
begin
Append (Env.all);
OS_Lib.Free (Env);
end;
else
-- This is not a variable after all
Append ('$');
Append (Path (E));
end if;
end if;
K := E;
end Var;
-- Start of processing for Expand_Path
begin
declare
K : Positive := Path'First;
begin
Read (K);
declare
Returned_Value : constant String := Result (1 .. Result_Last);
begin
OS_Lib.Free (Result);
return Returned_Value;
end;
end;
end Expand_Path;
--------------------
-- File_Extension --
--------------------
function File_Extension (Path : Path_Name) return String is
First : Natural :=
Strings.Fixed.Index
(Path, Dir_Seps, Going => Strings.Backward);
Dot : Natural;
begin
if First = 0 then
First := Path'First;
end if;
Dot := Strings.Fixed.Index (Path (First .. Path'Last),
".",
Going => Strings.Backward);
if Dot = 0 or else Dot = Path'Last then
return "";
else
return Path (Dot .. Path'Last);
end if;
end File_Extension;
---------------
-- File_Name --
---------------
function File_Name (Path : Path_Name) return String is
begin
return Base_Name (Path);
end File_Name;
---------------------
-- Format_Pathname --
---------------------
function Format_Pathname
(Path : Path_Name;
Style : Path_Style := System_Default) return String
is
N_Path : String := Path;
K : Positive := N_Path'First;
Prev_Dirsep : Boolean := False;
begin
if Dir_Separator = '\'
and then Path'Length > 1
and then Path (K .. K + 1) = "\\"
then
if Style = UNIX then
N_Path (K .. K + 1) := "//";
end if;
K := K + 2;
end if;
for J in K .. Path'Last loop
if Strings.Maps.Is_In (Path (J), Dir_Seps) then
if not Prev_Dirsep then
case Style is
when UNIX => N_Path (K) := '/';
when DOS => N_Path (K) := '\';
when System_Default => N_Path (K) := Dir_Separator;
end case;
K := K + 1;
end if;
Prev_Dirsep := True;
else
N_Path (K) := Path (J);
K := K + 1;
Prev_Dirsep := False;
end if;
end loop;
return N_Path (N_Path'First .. K - 1);
end Format_Pathname;
---------------------
-- Get_Current_Dir --
---------------------
Max_Path : Integer;
pragma Import (C, Max_Path, "__gnat_max_path_len");
function Get_Current_Dir return Dir_Name_Str is
Current_Dir : String (1 .. Max_Path + 1);
Last : Natural;
begin
Get_Current_Dir (Current_Dir, Last);
return Current_Dir (1 .. Last);
end Get_Current_Dir;
procedure Get_Current_Dir (Dir : out Dir_Name_Str; Last : out Natural) is
Path_Len : Natural := Max_Path;
Buffer : String (Dir'First .. Dir'First + Max_Path + 1);
procedure Local_Get_Current_Dir
(Dir : System.Address;
Length : System.Address);
pragma Import (C, Local_Get_Current_Dir, "__gnat_get_current_dir");
begin
Local_Get_Current_Dir (Buffer'Address, Path_Len'Address);
if Path_Len = 0 then
raise Ada.IO_Exceptions.Use_Error
with "current directory does not exist";
end if;
Last :=
(if Dir'Length > Path_Len then Dir'First + Path_Len - 1 else Dir'Last);
Dir (Buffer'First .. Last) := Buffer (Buffer'First .. Last);
-- By default, the drive letter on Windows is in upper case
if On_Windows and then Last > Dir'First and then
Dir (Dir'First + 1) = ':'
then
Dir (Dir'First) :=
Ada.Characters.Handling.To_Upper (Dir (Dir'First));
end if;
end Get_Current_Dir;
-------------
-- Is_Open --
-------------
function Is_Open (Dir : Dir_Type) return Boolean is
begin
return Dir /= Null_Dir
and then System.Address (Dir.all) /= System.Null_Address;
end Is_Open;
--------------
-- Make_Dir --
--------------
procedure Make_Dir (Dir_Name : Dir_Name_Str) is
C_Dir_Name : constant String := Dir_Name & ASCII.NUL;
begin
if CRTL.mkdir (C_Dir_Name, Unspecified) /= 0 then
raise Directory_Error;
end if;
end Make_Dir;
----------
-- Open --
----------
procedure Open
(Dir : out Dir_Type;
Dir_Name : Dir_Name_Str)
is
function opendir (file_name : String) return DIRs;
pragma Import (C, opendir, "__gnat_opendir");
C_File_Name : constant String := Dir_Name & ASCII.NUL;
begin
Dir := new Dir_Type_Value'(Dir_Type_Value (opendir (C_File_Name)));
if not Is_Open (Dir) then
Free (Dir);
Dir := Null_Dir;
raise Directory_Error;
end if;
end Open;
----------
-- Read --
----------
procedure Read
(Dir : Dir_Type;
Str : out String;
Last : out Natural)
is
Filename_Addr : Address;
Filename_Len : aliased Integer;
Buffer : array (0 .. Filename_Max + 12) of Character;
-- 12 is the size of the dirent structure (see dirent.h), without the
-- field for the filename.
function readdir_gnat
(Directory : System.Address;
Buffer : System.Address;
Last : not null access Integer) return System.Address;
pragma Import (C, readdir_gnat, "__gnat_readdir");
begin
if not Is_Open (Dir) then
raise Directory_Error;
end if;
Filename_Addr :=
readdir_gnat
(System.Address (Dir.all), Buffer'Address, Filename_Len'Access);
if Filename_Addr = System.Null_Address then
Last := 0;
return;
end if;
Last :=
(if Str'Length > Filename_Len then Str'First + Filename_Len - 1
else Str'Last);
declare
subtype Path_String is String (1 .. Filename_Len);
type Path_String_Access is access Path_String;
function Address_To_Access is new
Ada.Unchecked_Conversion
(Source => Address,
Target => Path_String_Access);
Path_Access : constant Path_String_Access :=
Address_To_Access (Filename_Addr);
begin
for J in Str'First .. Last loop
Str (J) := Path_Access (J - Str'First + 1);
end loop;
end;
end Read;
-------------------------
-- Read_Is_Thread_Safe --
-------------------------
function Read_Is_Thread_Safe return Boolean is
function readdir_is_thread_safe return Integer;
pragma Import
(C, readdir_is_thread_safe, "__gnat_readdir_is_thread_safe");
begin
return (readdir_is_thread_safe /= 0);
end Read_Is_Thread_Safe;
----------------
-- Remove_Dir --
----------------
procedure Remove_Dir
(Dir_Name : Dir_Name_Str;
Recursive : Boolean := False)
is
C_Dir_Name : constant String := Dir_Name & ASCII.NUL;
Last : Integer;
Str : String (1 .. Filename_Max);
Success : Boolean;
Current_Dir : Dir_Type;
begin
-- Remove the directory only if it is empty
if not Recursive then
if rmdir (C_Dir_Name) /= 0 then
raise Directory_Error;
end if;
-- Remove directory and all files and directories that it may contain
else
Open (Current_Dir, Dir_Name);
loop
Read (Current_Dir, Str, Last);
exit when Last = 0;
if GNAT.OS_Lib.Is_Directory
(Dir_Name & Dir_Separator & Str (1 .. Last))
then
if Str (1 .. Last) /= "."
and then
Str (1 .. Last) /= ".."
then
-- Recursive call to remove a subdirectory and all its
-- files.
Remove_Dir
(Dir_Name & Dir_Separator & Str (1 .. Last),
True);
end if;
else
GNAT.OS_Lib.Delete_File
(Dir_Name & Dir_Separator & Str (1 .. Last),
Success);
if not Success then
raise Directory_Error;
end if;
end if;
end loop;
Close (Current_Dir);
Remove_Dir (Dir_Name);
end if;
end Remove_Dir;
end GNAT.Directory_Operations;