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98a5072fbe
fpc/rtl/inc/fexpand.inc
Michael VAN CANNEYT 057cfc100c * check zero length instead of comparing to empty string
2023-07-14 17:26:11 +02:00

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{
This file is part of the Free Pascal run time library.
Copyright (c) 1997-2000 by the Free Pascal development team
See the file COPYING.FPC, included in this distribution,
for details about the copyright.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
**********************************************************************}
{****************************************************************************
A platform independent FExpand implementation
****************************************************************************}
{$IFDEF FPC_FEXPAND_VOLUMES}
{$IFNDEF FPC_FEXPAND_DRIVES}
(* Volumes are just a special case of drives. *)
{$DEFINE FPC_FEXPAND_DRIVES}
{$ENDIF FPC_FEXPAND_DRIVES}
{$ENDIF FPC_FEXPAND_VOLUMES}
{$IFDEF FPC_FEXPAND_DIRSEP_IS_CURDIR}
{$IFNDEF FPC_FEXPAND_DRIVES}
(* If DirectorySeparator at the beginning marks a relative path, *)
(* an absolute path must always begin with a drive or volume. *)
{$DEFINE FPC_FEXPAND_DRIVES}
{$ENDIF FPC_FEXPAND_DRIVES}
{$IFNDEF FPC_FEXPAND_MULTIPLE_UPDIR}
(* Traversing multiple levels at once explicitely allowed. *)
{$DEFINE FPC_FEXPAND_MULTIPLE_UPDIR}
{$ENDIF FPC_FEXPAND_MULTIPLE_UPDIR}
(* Helper define used to support common features of FPC_FEXPAND_DIRSEP_IS_* *)
{$DEFINE FPC_FEXPAND_UPDIR_HELPER}
{$ENDIF FPC_FEXPAND_DIRSEP_IS_CURDIR}
{$IFDEF FPC_FEXPAND_DIRSEP_IS_UPDIR}
{$IFNDEF FPC_FEXPAND_DRIVES}
(* If DirectorySeparator at the beginning marks a relative path, *)
(* an absolute path must always begin with a drive or volume. *)
{$DEFINE FPC_FEXPAND_DRIVES}
{$ENDIF FPC_FEXPAND_DRIVES}
{$IFNDEF FPC_FEXPAND_MULTIPLE_UPDIR}
(* Traversing multiple levels at once explicitely allowed. *)
{$DEFINE FPC_FEXPAND_MULTIPLE_UPDIR}
{$ENDIF FPC_FEXPAND_MULTIPLE_UPDIR}
(* Helper define used to support common features of FPC_FEXPAND_DIRSEP_IS_* *)
{$DEFINE FPC_FEXPAND_UPDIR_HELPER}
{$ENDIF FPC_FEXPAND_DIRSEP_IS_UPDIR}
{ this code is used both in sysutils and in the dos unit, and the dos
unit does not have a charinset routine }
{$if not defined(FPC_FEXPAND_SYSUTILS) and not defined(FPC_FEXPAND_HAS_CHARINSET)}
{$define FPC_FEXPAND_HAS_CHARINSET}
type
TFExpandSysCharSet = set of ansichar;
Function CharInSet(Ch:AnsiChar;Const CSet : TFExpandSysCharSet) : Boolean; inline;
begin
CharInSet:=ch in CSet;
end;
Function CharInSet(Ch:WideChar;Const CSet : TFExpandSysCharSet) : Boolean;
begin
CharInSet:=(Ch<=#$FF) and (ansichar(byte(ch)) in CSet);
end;
{$endif}
procedure GetDirIO (DriveNr: byte; var Dir: {$IF defined(FPC_FEXPAND_SYSUTILS) and not defined(SYSUTILSUNICODE)}RawByteString{$else}PathStr{$endif});
(* GetDirIO is supposed to return the root of the given drive *)
(* in case of an error for compatibility of FExpand with TP/BP. *)
var
OldInOutRes: word;
begin
OldInOutRes := InOutRes;
InOutRes := 0;
GetDir (DriveNr, Dir);
{$IF defined(FPC_FEXPAND_SYSUTILS) and not defined(SYSUTILSUNICODE)}
{ set the same codepage as used for the strings in fexpand itself }
SetCodePage(Dir,DefaultFileSystemCodePage);
{$ENDIF FPC_FEXPAND_SYSUTILS and not SYSUTILSUNICODE}
InOutRes := OldInOutRes;
end;
{$IFDEF FPC_FEXPAND_VOLUMES}
{$IFNDEF FPC_FEXPAND_NO_DEFAULT_PATHS}
procedure GetDirIO (const VolumeName: OpenString; var Dir: {$IF defined(FPC_FEXPAND_SYSUTILS) and not defined(SYSUTILSUNICODE)}RawByteString{$else}PathStr{$endif});
var
OldInOutRes: word;
begin
OldInOutRes := InOutRes;
InOutRes := 0;
GetDir (VolumeName, Dir);
InOutRes := OldInOutRes;
end;
{$ENDIF FPC_FEXPAND_NO_DEFAULT_PATHS}
{$ENDIF FPC_FEXPAND_VOLUMES}
function FExpand (const Path, BasePath: PathStr): PathStr;
(* LFNSupport boolean constant, variable or function must be declared for all
the platforms, at least locally in the Dos unit implementation part.
In addition, FPC_FEXPAND_UNC, FPC_FEXPAND_DRIVES, FPC_FEXPAND_GETENV_PCHAR,
FPC_FEXPAND_TILDE, FPC_FEXPAND_VOLUMES, FPC_FEXPAND_NO_DEFAULT_PATHS,
FPC_FEXPAND_DRIVESEP_IS_ROOT, FPC_FEXPAND_NO_CURDIR,
FPC_FEXPAND_NO_DOTS_UPDIR, FPC_FEXPAND_DIRSEP_IS_UPDIR,
FPC_FEXPAND_DIRSEP_IS_CURDIR and FPC_FEXPAND_MULTIPLE_UPDIR conditionals
might be defined to specify FExpand behaviour - see end of this file for
individual descriptions. Finally, FPC_FEXPAND_SYSUTILS allows to reuse
the same implementation for SysUtils.ExpandFileName.
*)
{$IFDEF FPC_FEXPAND_DRIVES}
var
PathStart: longint;
{$ELSE FPC_FEXPAND_DRIVES}
const
PathStart = 1;
{$ENDIF FPC_FEXPAND_DRIVES}
{$IFDEF FPC_FEXPAND_UNC}
var
RootNotNeeded: boolean;
{$ELSE FPC_FEXPAND_UNC}
const
RootNotNeeded = false;
{$ENDIF FPC_FEXPAND_UNC}
var S, Pa, Dirs, TmpS: {$IF defined(FPC_FEXPAND_SYSUTILS) and not defined(SYSUTILSUNICODE)}RawByteString{$else}PathStr{$endif};
I, J: longint;
begin
{$IFDEF FPC_FEXPAND_UNC}
RootNotNeeded := false;
{$ENDIF FPC_FEXPAND_UNC}
(* First convert the path to uppercase if appropriate for current platform. *)
{$IF defined(FPC_FEXPAND_SYSUTILS) and not defined(SYSUTILSUNICODE)}
{ for sysutils/rawbytestring, process everything in
DefaultFileSystemCodePage to prevent risking data loss that may be
relevant when the file name is used }
if FileNameCasePreserving then
Pa := ToSingleByteFileSystemEncodedFileName (Path)
else
Pa := UpCase (ToSingleByteFileSystemEncodedFileName (Path));
{$ELSE FPC_FEXPAND_SYSUTILS and not SYSUTILSUNICODE}
if FileNameCasePreserving then
Pa := Path
else
Pa := UpCase (Path);
{$ENDIF FPC_FEXPAND_SYSUTILS and not SYSUTILSUNICODE}
{ already done before this routine is called from sysutils }
{$IFNDEF FPC_FEXPAND_SYSUTILS}
(* Allow both '/' and '\' as directory separators *)
(* by converting all to the native one. *)
{$push}
{$warnings off}
for I := 1 to Length (Pa) do
if CharInSet(Pa [I], AllowDirectorySeparators) then
Pa [I] := DirectorySeparator;
{$pop}
{$ENDIF not FPC_FEXPAND_SYSUTILS}
(* PathStart is amount of characters to strip to get beginning *)
(* of path without volume/drive specification. *)
{$IFDEF FPC_FEXPAND_DRIVES}
{$IFDEF FPC_FEXPAND_VOLUMES}
{$IFDEF FPC_FEXPAND_DRIVESEP_IS_ROOT}
PathStart := Pos (DriveSeparator, Pa);
{$ELSE FPC_FEXPAND_DRIVESEP_IS_ROOT}
PathStart := Succ (Pos (DriveSeparator, Pa));
{$ENDIF FPC_FEXPAND_DRIVESEP_IS_ROOT}
{$ELSE FPC_FEXPAND_VOLUMES}
PathStart := 3;
{$ENDIF FPC_FEXPAND_VOLUMES}
{$ENDIF FPC_FEXPAND_DRIVES}
(* Expand tilde to home directory if appropriate. *)
{$IFDEF FPC_FEXPAND_TILDE}
{Replace ~/ with $HOME/}
if (Length (Pa) >= 1) and (Pa [1] = '~') and
((Length (Pa) = 1) or (Pa [2] = DirectorySeparator)) then
begin
{$IFDEF FPC_FEXPAND_SYSUTILS}
{$IFDEF SYSUTILSUNICODE}
S := PathStr(GetEnvironmentVariable ('HOME'));
{$ELSE SYSUTILSUNICODE}
S := ToSingleByteFileSystemEncodedFileName(GetEnvironmentVariable ('HOME'));
{$ENDIF SYSUTILSUNICODE}
{$ELSE FPC_FEXPAND_SYSUTILS}
{$IFDEF FPC_FEXPAND_GETENV_PCHAR}
S := StrPas (GetEnv ('HOME'));
{$ELSE FPC_FEXPAND_GETENV_PCHAR}
S := GetEnv ('HOME');
{$ENDIF FPC_FEXPAND_GETENV_PCHAR}
{$ENDIF FPC_FEXPAND_SYSUTILS}
if (Length(S)=0) or (Length (S) = 1) and (Length (Pa) > 1)
and (S [1] = DirectorySeparator) then
Delete (Pa, 1, 1)
else
if S [Length (S)] = DirectorySeparator then
Pa := S + Copy (Pa, 3, Length (Pa) - 2)
else
Pa := S + Copy (Pa, 2, Pred (Length (Pa)));
end;
{$ENDIF FPC_FEXPAND_TILDE}
(* Do we have a drive/volume specification? *)
{$IFDEF FPC_FEXPAND_VOLUMES}
if PathStart > 1 then
{$ELSE FPC_FEXPAND_VOLUMES}
if (Length (Pa) > 1) and CharInSet(Pa [1], ['A'..'Z', 'a'..'z']) and
(Pa [2] = DriveSeparator) and (DriveSeparator <> DirectorySeparator) then
{$ENDIF FPC_FEXPAND_VOLUMES}
begin
(* We need to know current directory on given *)
(* volume/drive _if_ such a thing is defined. *)
{$IFDEF FPC_FEXPAND_DRIVES}
{$IFNDEF FPC_FEXPAND_NO_DEFAULT_PATHS}
{$IFDEF FPC_FEXPAND_VOLUMES}
GetDirIO (Copy (Pa, 1, PathStart - 2), S);
{$ELSE FPC_FEXPAND_VOLUMES}
{ Always uppercase driveletter }
if CharInSet(Pa [1], ['a'..'z']) then
Pa [1] := Chr (Ord (Pa [1]) and not ($20));
GetDirIO (Ord (Pa [1]) - Ord ('A') + 1, S);
{$ENDIF FPC_FEXPAND_VOLUMES}
(* Do we have more than just drive/volume specification? *)
if Length (Pa) = Pred (PathStart) then
(* If not, just use the current directory for that drive/volume. *)
Pa := S
else
(* If yes, find out whether the following path is relative or absolute. *)
if Pa [PathStart] <> DirectorySeparator then
{$IFDEF FPC_FEXPAND_VOLUMES}
if Copy (Pa, 1, PathStart - 2) = Copy (S, 1, PathStart - 2)
then
{$ELSE FPC_FEXPAND_VOLUMES}
if UpCase(Pa [1]) = UpCase(S [1]) then
{$ENDIF FPC_FEXPAND_VOLUMES}
begin
{ remove ending slash if it already exists }
if S [Length (S)] = DirectorySeparator then
SetLength(S,Length(S)-1);
{$IFDEF FPC_FEXPAND_SYSUTILS}
{ not "Pa := S + DirectorySeparator + ..." because
that will convert the result to
DefaultSystemCodePage in case of RawByteString due
to DirectorySeparator being an ansichar }
TmpS := S;
SetLength(TmpS, Length(TmpS) + 1);
TmpS[Length(TmpS)] := DirectorySeparator;
Pa := TmpS +
Copy (Pa, PathStart, Length (Pa) - PathStart + 1)
{$ELSE FPC_FEXPAND_SYSUTILS}
Pa := S + DirectorySeparator +
Copy (Pa, PathStart, Length (Pa) - PathStart + 1)
{$ENDIF FPC_FEXPAND_SYSUTILS}
end
else
begin
TmpS := DriveSeparator + DirectorySeparator;
{$IF defined(FPC_FEXPAND_SYSUTILS) and not defined(SYSUTILSUNICODE)}
SetCodePage(TmpS, DefaultFileSystemCodePage, false);
{$ENDIF FPC_FEXPAND_SYSUTILS and not SYSUTILSUNICODE}
{$IFDEF FPC_FEXPAND_VOLUMES}
Pa := Copy (Pa, 1, PathStart - 2) + TmpS +
Copy (Pa, PathStart, Length (Pa) - PathStart + 1)
{$ELSE FPC_FEXPAND_VOLUMES}
{ copy() instead of Pa[1] to preserve string code page }
Pa := Copy (Pa, 1, 1) + TmpS +
Copy (Pa, PathStart, Length (Pa) - PathStart + 1)
{$ENDIF FPC_FEXPAND_VOLUMES}
end
{$ENDIF FPC_FEXPAND_NO_DEFAULT_PATHS}
end
else
{$ELSE FPC_FEXPAND_DRIVES}
(* If drives are not supported, but a drive *)
(* was supplied anyway, ignore (remove) it. *)
Delete (Pa, 1, 2);
end;
{Check whether we don't have an absolute path already}
if (Length (Pa) >= PathStart) and (Pa [PathStart] <> DirectorySeparator) or
(Length (Pa) < PathStart) then
{$ENDIF FPC_FEXPAND_DRIVES}
begin
(* Get base path *)
{$IF defined(FPC_FEXPAND_SYSUTILS) and not defined(SYSUTILSUNICODE)}
S := ToSingleByteFileSystemEncodedFileName (BasePath);
{$ELSE FPC_FEXPAND_SYSUTILS and not SYSUTILSUNICODE}
S := BasePath;
{$ENDIF FPC_FEXPAND_SYSUTILS and not SYSUTILSUNICODE}
if not FileNameCasePreserving then
S := UpCase(S)
else
{ Always uppercase driveletter }
if (Length (S) > 1) and CharInSet(S [1], ['a'..'z']) and
(S [2] = DriveSeparator) and (DriveSeparator <> DirectorySeparator) then
S [1] := Chr (Ord (S [1]) and not ($20));
{$IFDEF FPC_FEXPAND_VOLUMES}
{$IFDEF FPC_FEXPAND_DRIVESEP_IS_ROOT}
PathStart := Pos (DriveSeparator, S);
{$ELSE FPC_FEXPAND_DRIVESEP_IS_ROOT}
PathStart := Succ (Pos (DriveSeparator, S));
{$ENDIF FPC_FEXPAND_DRIVESEP_IS_ROOT}
{$ENDIF FPC_FEXPAND_VOLUMES}
(* Do we have an absolute path without drive or volume? *)
{$IFNDEF FPC_FEXPAND_DIRSEP_IS_CURDIR}
{$IFDEF FPC_FEXPAND_DRIVES}
if (Length (Pa) > 0)
{$IFDEF FPC_FEXPAND_DRIVESEP_IS_ROOT}
and (Pa [1] = DriveSeparator)
{$ELSE FPC_FEXPAND_DRIVESEP_IS_ROOT}
and (Pa [1] = DirectorySeparator)
{$ENDIF FPC_FEXPAND_DRIVESEP_IS_ROOT}
then
begin
{$IFDEF FPC_FEXPAND_UNC}
{Do not touch network drive names}
if (Length (Pa) > 1) and (Pa [2] = DirectorySeparator)
and LFNSupport then
begin
PathStart := 3;
{Find the start of the string of directories}
while (PathStart <= Length (Pa)) and
(Pa [PathStart] <> DirectorySeparator) do
Inc (PathStart);
if PathStart > Length (Pa) then
{We have just a machine name...}
if Length (Pa) = 2 then
{...or not even that one}
PathStart := 2
else
begin
{$IFDEF FPC_FEXPAND_SYSUTILS}
{ no string concatenation to prevent code page
conversion for RawByteString }
SetLength(Pa, Length(Pa) + 1);
Pa[Length(Pa)] := DirectorySeparator
{$ELSE FPC_FEXPAND_SYSUTILS}
Pa := Pa + DirectorySeparator;
{$ENDIF FPC_FEXPAND_SYSUTILS}
end
else if PathStart < Length (Pa) then
{We have a resource name as well}
begin
RootNotNeeded := true;
{Let's continue in searching}
repeat
Inc (PathStart);
until (PathStart > Length (Pa)) or
(Pa [PathStart] = DirectorySeparator);
end;
end
else
{$ENDIF FPC_FEXPAND_UNC}
begin
{$IFDEF FPC_FEXPAND_VOLUMES}
I := Pos (DriveSeparator, S);
{$IFDEF FPC_FEXPAND_DIRSEP_IS_UPDIR}
{$IFDEF FPC_FEXPAND_DRIVESEP_IS_ROOT}
if (Pa [1] = DriveSeparator) then
Delete (Pa, 1, 1);
{$ENDIF FPC_FEXPAND_DRIVESEP_IS_ROOT}
Pa := Copy (S, 1, I) + Pa;
PathStart := I;
{$ELSE FPC_FEXPAND_DIRSEP_IS_UPDIR}
TmpS := Copy (S, 1, Pred (I));
SetLength(TmpS, Length(TmpS) + 1);
TmpS[Length(TmpS)] := DriveSeparator;
Pa := TmpS + Pa;
PathStart := Succ (I);
{$ENDIF FPC_FEXPAND_DIRSEP_IS_UPDIR}
{$ELSE FPC_FEXPAND_VOLUMES}
TmpS := S[1] + DriveSeparator;
{$IF defined(FPC_FEXPAND_SYSUTILS) and not defined(SYSUTILSUNICODE)}
SetCodePage(TmpS, DefaultFileSystemCodePage, false);
{$ENDIF FPC_FEXPAND_SYSUTILS and not SYSUTILSUNICODE}
Pa := TmpS + Pa;
{$ENDIF FPC_FEXPAND_VOLUMES}
end;
end
else
{$ENDIF FPC_FEXPAND_DRIVES}
(* We already have a slash if root is the curent directory. *)
if Length (S) = PathStart then
Pa := S + Pa
{$ELSE FPC_FEXPAND_DIRSEP_IS_CURDIR}
(* More complex with DirectorySeparator as current directory *)
if (S [Length (S)] = DriveSeparator)
and (Pa [1] = DirectorySeparator) then
Pa := S + Copy (Pa, 2, Pred (Length (Pa)))
{$ENDIF FPC_FEXPAND_DIRSEP_IS_CURDIR}
else
(* We need an ending slash if FExpand was called *)
(* with an empty string for compatibility, except *)
(* for platforms where this is invalid. *)
if Length (Pa) = 0 then
begin
Pa := S;
{$IFNDEF FPC_FEXPAND_DIRSEP_IS_UPDIR}
{$IFDEF FPC_FEXPAND_SYSUTILS}
{ no string concatenation to prevent code page
conversion for RawByteString }
SetLength(Pa, Length(Pa) + 1);
Pa[Length(Pa)] := DirectorySeparator
{$ELSE FPC_FEXPAND_SYSUTILS}
Pa := Pa + DirectorySeparator;
{$ENDIF FPC_FEXPAND_SYSUTILS}
{$ENDIF not FPC_FEXPAND_DIRSEP_IS_UPDIR}
end
else
{$IFDEF FPC_FEXPAND_UPDIR_HELPER}
if Pa [1] = DirectorySeparator then
Pa := S + Pa
else
{$ENDIF FPC_FEXPAND_UPDIR_HELPER}
begin
{$IFDEF FPC_FEXPAND_SYSUTILS}
{ not "Pa := S + DirectorySeparator + Pa" because
that will convert the result to
DefaultSystemCodePage in case of RawByteString due
to DirectorySeparator being an ansichar. Don't
always use this code because in case of
truncation with shortstrings the result will be
different }
TmpS := S;
SetLength(TmpS, Length(TmpS) + 1);
TmpS[Length(TmpS)] := DirectorySeparator;
Pa := TmpS + Pa;
{$ELSE FPC_FEXPAND_SYSUTILS}
Pa := S + DirectorySeparator + Pa
{$ENDIF FPC_FEXPAND_SYSUTILS}
end;
end;
{Get string of directories to only process relative references on this one}
Dirs := Copy (Pa, Succ (PathStart), Length (Pa) - PathStart);
{$IFNDEF FPC_FEXPAND_DIRSEP_IS_CURDIR}
{$IFNDEF FPC_FEXPAND_DIRSEP_IS_UPDIR}
{Before anything else, remove doubled DirectorySeparator characters
- technically invalid or at least useless, but ignored by most operating
systems except for plain DOS.}
I := Pos (DirectorySeparator + DirectorySeparator, Dirs);
while I <> 0 do
begin
J := Succ (I);
while (Length (Dirs) > J) and (Dirs [Succ (J)] = DirectorySeparator) do
Inc (J);
Delete (Dirs, Succ (I), J - I);
I := Pos (DirectorySeparator + DirectorySeparator, Dirs);
end;
{$ENDIF FPC_FEXPAND_DIRSEP_IS_UPDIR}
{$ENDIF FPC_FEXPAND_DIRSEP_IS_CURDIR}
{$IFNDEF FPC_FEXPAND_NO_CURDIR}
{$IFNDEF FPC_FEXPAND_DIRSEP_IS_CURDIR}
{First remove all references to '\.\'}
I := Pos (DirectorySeparator + '.' + DirectorySeparator, Dirs);
while I <> 0 do
begin
Delete (Dirs, I, 2);
I := Pos (DirectorySeparator + '.' + DirectorySeparator, Dirs);
end;
{$ENDIF FPC_FEXPAND_DIRSEP_IS_CURDIR}
{$ENDIF FPC_FEXPAND_NO_CURDIR}
{$IFNDEF FPC_FEXPAND_NO_DOTS_UPDIR}
{$IFDEF FPC_FEXPAND_MULTIPLE_UPDIR}
{Now replace all references to '\...' with '\..\..'}
I := Pos (DirectorySeparator + '...', Dirs);
while I <> 0 do
begin
Insert (DirectorySeparator + '.', Dirs, I + 3);
I := Pos (DirectorySeparator + '...', Dirs);
end;
{$ENDIF FPC_FEXPAND_MULTIPLE_UPDIR}
{Now remove also all references to '\..\' + of course previous dirs..}
I := Pos (DirectorySeparator + '..' + DirectorySeparator, Dirs);
while I <> 0 do
begin
J := Pred (I);
while (J > 0) and (Dirs [J] <> DirectorySeparator) do
Dec (J);
Delete (Dirs, Succ (J), I - J + 3);
I := Pos (DirectorySeparator + '..' + DirectorySeparator, Dirs);
end;
{$ENDIF FPC_FEXPAND_NO_DOTS_UPDIR}
{$IFDEF FPC_FEXPAND_UPDIR_HELPER}
{ Now remove all references to '//' or '::' plus previous directories... }
I := Pos (DirectorySeparator + DirectorySeparator, Dirs);
while I <> 0 do
begin
J := Pred (I);
while (J > 0) and (Dirs [J] <> DirectorySeparator) do
Dec (J);
Delete (Dirs, Succ (J), Succ (I - J));
I := Pos (DirectorySeparator + DirectorySeparator, Dirs);
end;
{$ENDIF FPC_FEXPAND_UPDIR_HELPER}
{$IFNDEF FPC_FEXPAND_NO_DOTS_UPDIR}
{Then remove also a reference to '\..' at the end of line
+ the previous directory, of course,...}
I := Pos (DirectorySeparator + '..', Dirs);
if (I <> 0) and (I = Length (Dirs) - 2) then
begin
J := Pred (I);
while (J > 0) and (Dirs [J] <> DirectorySeparator) do
Dec (J);
if (J = 0) then
Dirs := ''
else
Delete (Dirs, Succ (J), I - J + 2);
end;
{$ENDIF FPC_FEXPAND_NO_DOTS_UPDIR}
{$IFNDEF FPC_FEXPAND_NO_CURDIR}
{$IFNDEF FPC_FEXPAND_DIRSEP_IS_CURDIR}
{...and also a possible reference to '\.'}
if (Length (Dirs) = 1) then
begin
if (Dirs [1] = '.') then
{A special case}
Dirs := ''
end
else
if (Length (Dirs) <> 0) and (Dirs [Length (Dirs)] = '.') and
(Dirs [Pred (Length (Dirs))] = DirectorySeparator) then
Delete (Dirs,length(Dirs)-1,2);
{Finally remove '.\' at the beginning of the string of directories...}
while (Length (Dirs) >= 2) and (Dirs [1] = '.')
and (Dirs [2] = DirectorySeparator) do
Delete (Dirs, 1, 2);
{$ENDIF FPC_FEXPAND_DIRSEP_IS_CURDIR}
{$ENDIF FPC_FEXPAND_NO_CURDIR}
{$IFDEF FPC_FEXPAND_DIRSEP_IS_UPDIR}
(* Remove possible (invalid) references to '/' at the beginning. *)
while (Length (Dirs) >= 1) and (Dirs [1] = '/') do
Delete (Dirs, 1, 1);
{$ENDIF FPC_FEXPAND_DIRSEP_IS_UPDIR}
{$IFNDEF FPC_FEXPAND_NO_DOTS_UPDIR}
{...and possible (invalid) references to '..\' as well}
while (Length (Dirs) >= 3) and (Dirs [1] = '.') and (Dirs [2] = '.') and
(Dirs [3] = DirectorySeparator) do
Delete (Dirs, 1, 3);
{$ENDIF FPC_FEXPAND_NO_DOTS_UPDIR}
{Two special cases - '.' and '..' alone}
{$IFNDEF FPC_FEXPAND_NO_CURDIR}
{$IFNDEF FPC_FEXPAND_DIRSEP_IS_CURDIR}
if (Length (Dirs) = 1) and (Dirs [1] = '.') then
Dirs := '';
{$ENDIF FPC_FEXPAND_DIRSEP_IS_CURDIR}
{$ENDIF FPC_FEXPAND_NO_CURDIR}
{$IFNDEF FPC_FEXPAND_NO_DOTS_UPDIR}
if (Length (Dirs) = 2) and (Dirs [1] = '.') and (Dirs [2] = '.') then
Dirs := '';
{$ENDIF FPC_FEXPAND_NO_DOTS_UPDIR}
{Join the parts back to create the complete path}
if Length (Dirs) = 0 then
begin
Pa := Copy (Pa, 1, PathStart);
{$IFNDEF FPC_FEXPAND_DRIVESEP_IS_ROOT}
if Pa [PathStart] <> DirectorySeparator then
begin
{$IFDEF FPC_FEXPAND_SYSUTILS}
{ no string concatenation to prevent code page
conversion for RawByteString }
SetLength(Pa, Length(Pa) + 1);
Pa[Length(Pa)] := DirectorySeparator
{$ELSE FPC_FEXPAND_SYSUTILS}
Pa := Pa + DirectorySeparator;
{$ENDIF FPC_FEXPAND_SYSUTILS}
end
{$ENDIF FPC_FEXPAND_DRIVESEP_IS_ROOT}
end
else
Pa := Copy (Pa, 1, PathStart) + Dirs;
{$IFNDEF FPC_FEXPAND_DIRSEP_IS_UPDIR}
{Remove ending \ if not supplied originally, the original string
wasn't empty (to stay compatible) and if not really needed}
if (Pa [Length (Pa)] = DirectorySeparator)
and ((Length (Pa) > PathStart) or
{A special case with UNC paths}
(RootNotNeeded and (Length (Pa) = PathStart)))
{Reference to current directory at the end should be removed}
and (Length (Path) <> 0)
and (Path [Length (Path)] <> DirectorySeparator)
then
Delete (PA,length(PA),1);
{$ENDIF FPC_FEXPAND_DIRSEP_IS_UPDIR}
{$IF defined(FPC_FEXPAND_SYSUTILS) and not defined(SYSUTILSUNICODE)}
{ return result in expected code page }
SetCodePage(Pa,DefaultRTLFileSystemCodePage);
{$ENDIF FPC_FEXPAND_SYSUTILS and not SYSUTILSUNICODE}
FExpand := Pa;
end;
function FExpand (const Path: PathStr): PathStr;
var
BaseDir: {$IF defined(FPC_FEXPAND_SYSUTILS) and not defined(SYSUTILSUNICODE)}RawByteString{$else}PathStr{$endif};
begin
GetDirIO(0, BaseDir);
{$IF defined(FPC_FEXPAND_SYSUTILS) and not defined(SYSUTILSUNICODE)}
{ convert BaseDir to expected code page }
SetCodePage(BaseDir,DefaultRTLFileSystemCodePage);
{$ENDIF FPC_FEXPAND_SYSUTILS and not SYSUTILSUNICODE}
FExpand := FExpand(Path, PathStr(BaseDir));
end;
(* Description of individual conditional defines supported for FExpand
(disregard the used directory separators in examples, constant
System.DirectorySeparator is used in the real implemenation, of course):
FPC_FEXPAND_UNC - UNC ("Universal Naming Convention") paths are
supported (usually used for networking, used in DOS (with
networking support installed), OS/2, Win32 and at least some
Netware versions as far as I remember. An example of such a path
is '\\servername\sharename\some\path'.
FPC_FEXPAND_DRIVES - drive letters are supported (DOS-like
environments - DOS, OS/2, Win32). Example is 'C:\TEST'.
FPC_FEXPAND_GETENV_PCHAR - an implementation of GetEnv returning
PAnsiChar instead of a shortstring is available (Unix) to support
long values of environment variables.
FPC_FEXPAND_TILDE - expansion of '~/' to GetEnv('HOME') - Unix.
Example: '~/some/path'.
FPC_FEXPAND_VOLUMES - volumes are supported (similar to drives,
but the name can be longer; used under Netware, Amiga and
probably MacOS as far as I understand it correctly). Example:
'VolumeName:Some:Path' or 'ServerName/Volume:Some\Path'
(Netware).
FPC_FEXPAND_NO_DEFAULT_PATHS - Dos keeps information about the
current directory for every drive. If some platform supports
drives or volumes, but keeps no track of current directories for
them (i.e. there's no support for "GetDir(DriveNumber, Dir)" or
"GetDir(Volume, Dir)", but only for "GetDir (0, Dir)" (i.e. the
overall current directory), you should define this. Otherwise
constructs like 'C:Some\Path' refer a path relative to the
current directory on the C: drive.
FPC_FEXPAND_DRIVESEP_IS_ROOT - this means that DriveSeparator
should be used as beginning of the "real" path for a particular
drive or volume instead of the DirectorySeparator. This would be
used in case that there is only one character (DriveSeparator)
delimitting the drive letter or volume name from the remaining
path _and_ the DriveSeparator marks the root of an absolute path
in that case. Example - 'Volume:This/Is/Absolute/Path'.
FPC_FEXPAND_NO_CURDIR - there is no support to refer to current
directory explicitely (like '.' used under both Unix and DOS-like
environments).
FPC_FEXPAND_NO_DOTS_UPDIR - '..' cannot be used to refer to the
upper directory.
FPC_FEXPAND_DIRSEP_IS_UPDIR - DirectorySeparator at the beginning of
a path (or doubled DirectorySeparator inside the path) refer to the
parent directory, one more DirectorySeparator to parent directory of
parent directory and so on (Amiga). Please, note that you can decide
to support both '..' and DirectorySeparator as references to the parent
directory at the same time for compatibility reasons - however this
support makes it impossible to use otherwise possibly valid name
of '..'.
FPC_FEXPAND_DIRSEP_IS_CURDIR - DirectorySeparator at the beginning of
a path refers to the current directory (i.e. path beginning with
DirectorySeparator is always a relative path). Two DirectorySeparator
characters refer to the parent directory, three refer to parent
directory of the parent directory and so on (MacOS).
FPC_FEXPAND_MULTIPLE_UPDIR - grouping of more characters specifying
upper directory references higher directory levels. Example: '...'
(Netware).
FPC_FEXPAND_SYSUTILS allows to reuse the same implementation for
SysUtils.ExpandFileName by avoiding things specific for unit Dos.
*)
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