/** @file | |
Defines file-path manipulation functions. | |
Copyright (c) 2011 - 2017, Intel Corporation. All rights reserved.<BR> | |
This program and the accompanying materials | |
are licensed and made available under the terms and conditions of the BSD License | |
which accompanies this distribution. The full text of the license may be found at | |
http://opensource.org/licenses/bsd-license.php. | |
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, | |
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. | |
**/ | |
#include <Library/BaseMemoryLib.h> | |
#include <Library/BaseLib.h> | |
/** | |
Removes the last directory or file entry in a path. For a path which is | |
like L"fs0:startup.nsh", it's converted to L"fs0:". | |
@param[in,out] Path A pointer to the path to modify. | |
@retval FALSE Nothing was found to remove. | |
@retval TRUE A directory or file was removed. | |
**/ | |
BOOLEAN | |
EFIAPI | |
PathRemoveLastItem( | |
IN OUT CHAR16 *Path | |
) | |
{ | |
CHAR16 *Walker; | |
CHAR16 *LastSlash; | |
// | |
// get directory name from path... ('chop' off extra) | |
// | |
for ( Walker = Path, LastSlash = NULL | |
; Walker != NULL && *Walker != CHAR_NULL | |
; Walker++ | |
){ | |
if (*Walker == L'\\' && *(Walker + 1) != CHAR_NULL) { | |
LastSlash = Walker+1; | |
} else if (*Walker == L':' && *(Walker + 1) != L'\\' && *(Walker + 1) != CHAR_NULL) { | |
LastSlash = Walker+1; | |
} | |
} | |
if (LastSlash != NULL) { | |
*LastSlash = CHAR_NULL; | |
return (TRUE); | |
} | |
return (FALSE); | |
} | |
/** | |
Function to clean up paths. | |
- Single periods in the path are removed. | |
- Double periods in the path are removed along with a single parent directory. | |
- Forward slashes L'/' are converted to backward slashes L'\'. | |
This will be done inline and the existing buffer may be larger than required | |
upon completion. | |
@param[in] Path The pointer to the string containing the path. | |
@return Returns Path, otherwise returns NULL to indicate that an error has occured. | |
**/ | |
CHAR16* | |
EFIAPI | |
PathCleanUpDirectories( | |
IN CHAR16 *Path | |
) | |
{ | |
CHAR16 *TempString; | |
if (Path == NULL) { | |
return NULL; | |
} | |
// | |
// Replace the '/' with '\' | |
// | |
for (TempString = Path; *TempString != CHAR_NULL; TempString++) { | |
if (*TempString == L'/') { | |
*TempString = L'\\'; | |
} | |
} | |
// | |
// Remove all the "\.". E.g.: fs0:\abc\.\def\. | |
// | |
while ((TempString = StrStr (Path, L"\\.\\")) != NULL) { | |
CopyMem (TempString, TempString + 2, StrSize (TempString + 2)); | |
} | |
if ((StrLen (Path) >= 2) && (StrCmp (Path + StrLen (Path) - 2, L"\\.") == 0)) { | |
Path[StrLen (Path) - 1] = CHAR_NULL; | |
} | |
// | |
// Remove all the "\..". E.g.: fs0:\abc\..\def\.. | |
// | |
while (((TempString = StrStr(Path, L"\\..")) != NULL) && | |
((*(TempString + 3) == L'\\') || (*(TempString + 3) == CHAR_NULL)) | |
) { | |
*(TempString + 1) = CHAR_NULL; | |
PathRemoveLastItem(Path); | |
CopyMem (Path + StrLen (Path), TempString + 3, StrSize (TempString + 3)); | |
} | |
// | |
// Replace the "\\" with "\" | |
// | |
while ((TempString = StrStr (Path, L"\\\\")) != NULL) { | |
CopyMem (TempString, TempString + 1, StrSize (TempString + 1)); | |
} | |
return Path; | |
} | |