[PATCH v2] ShellPkg/Ls: Handle path specified from root

[Jeff Westfahl <jeff.westfahl@ni.com>]

This fixes 'ls' when specifying a path from the root, like "ls \" from
within a subfolder. Currently, 'ls' will append the specified path to the
current working directory. The correct behavior is to start from the root
of the currently selected filesystem.

Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Jaben Carsey <jaben.carsey@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Westfahl <jeff.westfahl@ni.com>
---
 ShellPkg/Library/UefiShellLevel2CommandsLib/Ls.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/ShellPkg/Library/UefiShellLevel2CommandsLib/Ls.c b/ShellPkg/Library/UefiShellLevel2CommandsLib/Ls.c
index 8d33392..8eeb2c0 100644
--- a/ShellPkg/Library/UefiShellLevel2CommandsLib/Ls.c
+++ b/ShellPkg/Library/UefiShellLevel2CommandsLib/Ls.c
@@ -685,6 +685,9 @@ ShellCommandRunLs (
                 ShellCommandLineFreeVarList (Package);
                 return SHELL_OUT_OF_RESOURCES;
               }
+              if (PathName[0] == L'\\') {
+                while (PathRemoveLastItem(FullPath)) ;
+              }
               Size = FullPath != NULL? StrSize(FullPath) : 0;
               StrnCatGrow(&FullPath, &Size, L"\\", 0);
             }
-- 
2.7.4