From 0c0e0a041daab3600ed326a712437cc3a14afd33 Mon Sep 17 00:00:00 2001
From: qhuang8 <qhuang8@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Fri, 25 Jan 2008 03:10:15 +0000
Subject: [PATCH] Fix a bug in print library "%a" should not print anything if
 the var argument points to a null string. The default precision for string
 should be set to 0 according to MdeLib spec.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@4634 6f19259b-4bc3-4df7-8a09-765794883524
---
 MdePkg/Library/BasePrintLib/PrintLib.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/MdePkg/Library/BasePrintLib/PrintLib.c b/MdePkg/Library/BasePrintLib/PrintLib.c
index 145ca3494a..548ec5490f 100644
--- a/MdePkg/Library/BasePrintLib/PrintLib.c
+++ b/MdePkg/Library/BasePrintLib/PrintLib.c
@@ -355,6 +355,12 @@ BasePrintLibVSPrint (
           Flags &= (~ARGUMENT_UNICODE);
           ArgumentString = "<null string>";
         }
+        //
+        // Set the default precision for string to be zero if not specified.
+        //
+        if ((Flags & PRECISION) == 0) {
+          Precision = 0;
+        }
         break;
 
       case 'c':
-- 
2.39.2