[PATCH 4/6] MdePkg: Enhance PathRemoveLastItem() to support "FS0:File.txt"

[Ruiyu Ni <ruiyu.ni@intel.com>]

The original implementation only looks for very last backslash
and removes the string after that.
But when the path is like "FS0:File.txt" which doesn't contain
backslash, the function cannot work well.
The patch enhances the code to look for very last backslash or
colon to support the path which doesn't contain backslash.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Jaben Carsey <jaben.carsey@intel.com>
---
 MdePkg/Library/BaseLib/FilePaths.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/MdePkg/Library/BaseLib/FilePaths.c b/MdePkg/Library/BaseLib/FilePaths.c
index c72ef72..c8da6bb 100644
--- a/MdePkg/Library/BaseLib/FilePaths.c
+++ b/MdePkg/Library/BaseLib/FilePaths.c
@@ -17,7 +17,8 @@
 
 /**
   Removes the last directory or file entry in a path by changing the last
-  L'\' to a CHAR_NULL.
+  L'\' to a CHAR_NULL. 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.
 
@@ -39,7 +40,7 @@ PathRemoveLastItem(
       ; Walker != NULL && *Walker != CHAR_NULL
       ; Walker++
      ){
-    if (*Walker == L'\\' && *(Walker + 1) != CHAR_NULL) {
+    if ((*Walker == L'\\' || *Walker == L':') && *(Walker + 1) != CHAR_NULL) {
       LastSlash = Walker+1;
     }
   }
-- 
2.9.0.windows.1