From 50f82283e5f7ed3388cdc7de9e4a53bd40f26e2c Mon Sep 17 00:00:00 2001
From: Matthijs Lavrijsen <mattiwatti@gmail.com>
Date: Wed, 24 Aug 2022 01:06:41 +0200
Subject: Add StrniCmp implementation

---
 EfiGuardDxe/util.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

(limited to 'EfiGuardDxe/util.c')

diff --git a/EfiGuardDxe/util.c b/EfiGuardDxe/util.c
index 230f491..2bb406f 100644
--- a/EfiGuardDxe/util.c
+++ b/EfiGuardDxe/util.c
@@ -99,6 +99,33 @@ PrintKernelPatchInfo(
 	}
 }
 
+INTN
+EFIAPI
+StrniCmp(
+	IN CONST CHAR16 *FirstString,
+	IN CONST CHAR16 *SecondString,
+	IN UINTN Length
+	)
+{
+	if (FirstString == NULL || SecondString == NULL || Length == 0)
+		return 0;
+
+	CHAR16 UpperFirstChar = CharToUpper(*FirstString);
+	CHAR16 UpperSecondChar = CharToUpper(*SecondString);
+	while ((*FirstString != L'\0') && (*SecondString != L'\0') &&
+		(UpperFirstChar == UpperSecondChar) &&
+		(Length > 1))
+	{
+		FirstString++;
+		SecondString++;
+		UpperFirstChar = CharToUpper(*FirstString);
+		UpperSecondChar = CharToUpper(*SecondString);
+		Length--;
+	}
+
+	return UpperFirstChar - UpperSecondChar;
+}
+
 BOOLEAN
 EFIAPI
 WaitForKey(
-- 
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