ShellPkg: Add Shell[Get|Set]RawCmdLine to ShellCommandLib

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Jaben Carsey <jaben.carsey@intel.com>

ShellPkg/Include/Library/ShellCommandLib.h

@@ -670,6 +670,29 @@ ShellFileHandleEof(
   IN SHELL_FILE_HANDLE Handle
   );
 
+/**
+  Function to get the original CmdLine string for current command.
+
+  @return     A pointer to the buffer of the original command string.
+              It's the caller's responsibility to free the buffer.
+**/
+CHAR16*
+EFIAPI
+ShellGetRawCmdLine (
+  VOID
+  );
+
+/**
+  Function to store the orgignal command string into mOriginalCmdLine.
+
+  @param[in] CmdLine     the command line string to store.
+**/
+VOID
+EFIAPI
+ShellSetRawCmdLine (
+  IN CONST CHAR16     *CmdLine
+  );
+
 typedef struct {
   LIST_ENTRY    Link;
   void          *Buffer;