ShellPkg: pre-verify split commands

This makes sure that all parts of commands split via pipe operation are valid before starting.

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


git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15011 6f19259b-4bc3-4df7-8a09-765794883524

ShellPkg/Application/Shell/Shell.h

@@ -132,6 +132,32 @@ typedef enum {
   UNKNOWN_INVALID
 } SHELL_OPERATION_TYPES;
 
+/**
+  Converts the command line to it's post-processed form.  this replaces variables and alias' per UEFI Shell spec.
+
+  @param[in,out] CmdLine        pointer to the command line to update
+
+  @retval EFI_SUCCESS           The operation was successful
+  @retval EFI_OUT_OF_RESOURCES  A memory allocation failed.
+  @return                       some other error occured
+**/
+EFI_STATUS
+EFIAPI
+ProcessCommandLineToFinal(
+  IN OUT CHAR16 **CmdLine
+  );
+
+/**
+  Function to update the shell variable "lasterror"
+
+  @param[in] ErrorCode      the error code to put into lasterror
+**/
+EFI_STATUS
+EFIAPI
+SetLastError(
+  IN CONST SHELL_STATUS   ErrorCode
+  );
+
 /**
   Sets all the alias' that were registered with the ShellCommandLib library.