From ecfd71af17316deefd3cd4eaa305016b6678109b Mon Sep 17 00:00:00 2001
From: jcarsey <jcarsey@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Thu, 19 Jan 2012 18:18:12 +0000
Subject: [PATCH] ShellPkg: Fix SimpleTextInputEx based "CTRL-S" by emptying
 the buffer to prevent immediate release of the pause.

signed-off-by: jcarsey
reviewed-by: leegrosenbaum

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12944 6f19259b-4bc3-4df7-8a09-765794883524
---
 ShellPkg/Application/Shell/ShellProtocol.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/ShellPkg/Application/Shell/ShellProtocol.c b/ShellPkg/Application/Shell/ShellProtocol.c
index 00bbc358fa..3371e58b11 100644
--- a/ShellPkg/Application/Shell/ShellProtocol.c
+++ b/ShellPkg/Application/Shell/ShellProtocol.c
@@ -2,7 +2,7 @@
   Member functions of EFI_SHELL_PROTOCOL and functions for creation,
   manipulation, and initialization of EFI_SHELL_PROTOCOL.
 
-  Copyright (c) 2009 - 2011, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2009 - 2012, 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
@@ -3336,8 +3336,8 @@ NotificationFunction(
   IN EFI_KEY_DATA *KeyData
   )
 {
-//  ShellPrintEx(-1,-1,L"  <Notify>  ");
-   if ((KeyData->Key.UnicodeChar == L'c' || KeyData->Key.UnicodeChar == 3) &&
+  EFI_INPUT_KEY Key;
+  if ((KeyData->Key.UnicodeChar == L'c' || KeyData->Key.UnicodeChar == 3) &&
       (KeyData->KeyState.KeyShiftState == (EFI_SHIFT_STATE_VALID|EFI_LEFT_CONTROL_PRESSED) || KeyData->KeyState.KeyShiftState  == (EFI_SHIFT_STATE_VALID|EFI_RIGHT_CONTROL_PRESSED))
       ){ 
     if (ShellInfoObject.NewEfiShellProtocol->ExecutionBreak == NULL) {
@@ -3348,6 +3348,12 @@ NotificationFunction(
               (KeyData->KeyState.KeyShiftState  == (EFI_SHIFT_STATE_VALID|EFI_LEFT_CONTROL_PRESSED) || KeyData->KeyState.KeyShiftState  == (EFI_SHIFT_STATE_VALID|EFI_RIGHT_CONTROL_PRESSED))
               ){ 
     ShellInfoObject.HaltOutput = TRUE;
+
+    //
+    // Make sure that there are no pending keystrokes to pervent the pause.
+    //
+    gST->ConIn->Reset(gST->ConIn, FALSE);
+    while (gST->ConIn->ReadKeyStroke (gST->ConIn, &Key)==EFI_SUCCESS);
   }
   return (EFI_SUCCESS);
 }