From ab94587a7d2cd89695f9190420daceae0d2b7446 Mon Sep 17 00:00:00 2001
From: jcarsey <jcarsey@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Thu, 30 Jun 2011 22:58:53 +0000
Subject: This refactors 3 functions out of ShellCommandLib and puts them into
 a new library (but as 2 functions instead of 3).  This allows for users
 outside of the shell itself to have access to these functions.

1) Remove the 3 functions out of the shell's internal library (ShellCommandLib)
2) Add a new library class (PathLib)
3) Add an instance of this class (BasePathLib)
4) Change all internal shell callers to use this new library class.

signed-off-by: jcarsey
reviewed-by: jljusten

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11936 6f19259b-4bc3-4df7-8a09-765794883524
---
 ShellPkg/Library/BasePathLib/BasePathLib.c | 122 +++++++++++++++++++++++++++++
 1 file changed, 122 insertions(+)
 create mode 100644 ShellPkg/Library/BasePathLib/BasePathLib.c

(limited to 'ShellPkg/Library/BasePathLib/BasePathLib.c')

diff --git a/ShellPkg/Library/BasePathLib/BasePathLib.c b/ShellPkg/Library/BasePathLib/BasePathLib.c
new file mode 100644
index 0000000000..53a2a095b5
--- /dev/null
+++ b/ShellPkg/Library/BasePathLib/BasePathLib.c
@@ -0,0 +1,122 @@
+/** @file
+  Provides interface to path manipulation functions.
+
+  Copyright (c) 2011, 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 <Base.h>
+#include <Library/BaseMemoryLib.h>
+#include <Library/PathLib.h>
+#include <Library/BaseLib.h>
+
+/**
+  Removes the last directory or file entry in a path by changing the last
+  L'\' to a CHAR_NULL.
+
+  @param[in,out] Path    The 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;
+    }
+  }
+  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.
+
+  @retval NULL          An error occured.
+  @return Path in all other instances.
+**/
+CHAR16*
+EFIAPI
+PathCleanUpDirectories(
+  IN CHAR16 *Path
+  )
+{
+  CHAR16  *TempString;
+  UINTN   TempSize;
+  if (Path==NULL) {
+    return(NULL);
+  }
+
+  //
+  // Fix up the / vs \
+  //
+  for (TempString = Path ; TempString != NULL && *TempString != CHAR_NULL ; TempString++) {
+    if (*TempString == L'/') {
+      *TempString = L'\\';
+    }
+  }
+
+  //
+  // Fix up the ..
+  //
+  while ((TempString = StrStr(Path, L"\\..\\")) != NULL) {
+    *TempString = CHAR_NULL;
+    TempString  += 4;
+    PathRemoveLastItem(Path);
+    TempSize = StrSize(TempString);
+    CopyMem(Path+StrLen(Path), TempString, TempSize);
+  }
+  if ((TempString = StrStr(Path, L"\\..")) != NULL && *(TempString + 3) == CHAR_NULL) {
+    *TempString = CHAR_NULL;
+    PathRemoveLastItem(Path);
+  }
+
+  //
+  // Fix up the .
+  //
+  while ((TempString = StrStr(Path, L"\\.\\")) != NULL) {
+    *TempString = CHAR_NULL;
+    TempString  += 2;
+    TempSize = StrSize(TempString);
+    CopyMem(Path+StrLen(Path), TempString, TempSize);
+  }
+  if ((TempString = StrStr(Path, L"\\.")) != NULL && *(TempString + 2) == CHAR_NULL) {
+    *TempString = CHAR_NULL;
+  }
+
+
+
+  return (Path);
+}
+
-- 
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