[PATCH 04/17] MdePkg/UefidebugLibConOut: Add a new api DebugVPrint

[Zhichao Gao <zhichao.gao@intel.com>]

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1395

Add a new api DebugVPrint implementation in the
DebugLib instance. This api would expose a print
routine with VaList parameter.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Zhichao Gao <zhichao.gao@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Sean Brogan <sean.brogan@microsoft.com>
Cc: Michael Turner <Michael.Turner@microsoft.com>
Cc: Bret Barkelew <Bret.Barkelew@microsoft.com>
---
 MdePkg/Library/UefiDebugLibConOut/DebugLib.c | 44 ++++++++++++++++++++++++----
 1 file changed, 38 insertions(+), 6 deletions(-)

diff --git a/MdePkg/Library/UefiDebugLibConOut/DebugLib.c b/MdePkg/Library/UefiDebugLibConOut/DebugLib.c
index f04207c93f..4028098f92 100644
--- a/MdePkg/Library/UefiDebugLibConOut/DebugLib.c
+++ b/MdePkg/Library/UefiDebugLibConOut/DebugLib.c
@@ -1,7 +1,7 @@
 /** @file
   UEFI Debug Library that sends messages to the Console Output Device in the EFI System Table.
 
-  Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2006 - 2019, 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
@@ -50,9 +50,44 @@ DebugPrint (
   ...
   )
 {
-  CHAR16   Buffer[MAX_DEBUG_MESSAGE_LENGTH];
   VA_LIST  Marker;
 
+  ASSERT(Format != NULL);
+
+  //
+  // Convert the DEBUG() message to a Unicode String
+  //
+  VA_START (Marker, Format);
+  DebugVPrint (ErrorLevel,  Format, Marker);
+  VA_END (Marker);
+}
+
+/**
+  Prints a debug message to the debug output device if the specified error level is enabled.
+
+  If any bit in ErrorLevel is also set in DebugPrintErrorLevelLib function
+  GetDebugPrintErrorLevel (), then print the message specified by Format and the
+  associated variable argument list to the debug output device.
+
+  If Format is NULL, then ASSERT().
+  If the length of the message string specificed by Format is larger than the maximum allowable
+  record length, then directly return and not print it.
+
+  @param  ErrorLevel    The error level of the debug message.
+  @param  Format        Format string for the debug message to print.
+  @param  VaListMarker  VA_LIST marker for the variable argument list.
+
+**/
+VOID
+EFIAPI
+DebugVPrint (
+  IN  UINTN        ErrorLevel,
+  IN  CONST CHAR8  *Format,
+  IN  VA_LIST       VaListMarker
+  )
+{
+  CHAR16   Buffer[MAX_DEBUG_MESSAGE_LENGTH];
+
   //
   // If Format is NULL, then ASSERT().
   //
@@ -68,9 +103,7 @@ DebugPrint (
   //
   // Convert the DEBUG() message to a Unicode String
   //
-  VA_START (Marker, Format);
-  UnicodeVSPrintAsciiFormat (Buffer, MAX_DEBUG_MESSAGE_LENGTH,  Format, Marker);
-  VA_END (Marker);
+  UnicodeVSPrintAsciiFormat (Buffer, MAX_DEBUG_MESSAGE_LENGTH,  Format, VaListMarker);
 
 
   //
@@ -81,7 +114,6 @@ DebugPrint (
   }
 }
 
-
 /**
   Prints an assert message containing a filename, line number, and description.
   This may be followed by a breakpoint or a dead loop.
-- 
2.16.2.windows.1