From 557b3f18d13017a818d38f00a7afbe6f618d5fcd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marvin=20H=C3=A4user?=
 <8659494+mhaeuser@users.noreply.github.com>
Date: Sat, 27 Feb 2021 19:43:15 +0100
Subject: [PATCH] OcStringLib: Import MixedStrCmp()

---
 Include/Acidanthera/Library/OcStringLib.h | 23 +++++++++++++++++++++++
 Library/OcStringLib/OcUnicodeLib.c        | 14 ++++++++++++++
 2 files changed, 37 insertions(+)

diff --git a/Include/Acidanthera/Library/OcStringLib.h b/Include/Acidanthera/Library/OcStringLib.h
index 9941d2df..d312022b 100755
--- a/Include/Acidanthera/Library/OcStringLib.h
+++ b/Include/Acidanthera/Library/OcStringLib.h
@@ -557,4 +557,27 @@ HasValidGuidStringPrefix (
   IN CONST CHAR16  *String
   );
 
+/**
+  Compares two Null-terminated Unocide and ASCII strings, and returns the
+  difference between the first mismatched characters.
+
+  This function compares the Null-terminated Unicode string FirstString to the
+  Null-terminated ASCII string SecondString. If FirstString is identical to
+  SecondString, then 0 is returned. Otherwise, the value returned is the first
+  mismatched character in SecondString subtracted from the first mismatched
+  character in FirstString.
+
+  @param  FirstString   A pointer to a Null-terminated Unicode string.
+  @param  SecondString  A pointer to a Null-terminated ASCII string.
+
+  @retval ==0      FirstString is identical to SecondString.
+  @retval !=0      FirstString is not identical to SecondString.
+
+**/
+INTN
+MixedStrCmp (
+  IN CONST CHAR16  *FirstString,
+  IN CONST CHAR8   *SecondString
+  );
+
 #endif // OC_STRING_LIB_H
diff --git a/Library/OcStringLib/OcUnicodeLib.c b/Library/OcStringLib/OcUnicodeLib.c
index 1c24422c..6392a19f 100755
--- a/Library/OcStringLib/OcUnicodeLib.c
+++ b/Library/OcStringLib/OcUnicodeLib.c
@@ -405,3 +405,17 @@ HasValidGuidStringPrefix (
 
   return TRUE;
 }
+
+INTN
+MixedStrCmp (
+  IN CONST CHAR16  *FirstString,
+  IN CONST CHAR8   *SecondString
+  )
+{
+  while (*FirstString != '\0' && *FirstString == *SecondString) {
+    ++FirstString;
+    ++SecondString;
+  }
+
+  return *FirstString - *SecondString;
+}