From e482b394efc371412ce659b731a9b1e1d73bdf0e Mon Sep 17 00:00:00 2001
From: akallabeth <akallabeth@posteo.net>
Date: Mon, 24 Oct 2022 10:42:56 +0200
Subject: [PATCH] Added function _wcsncmp

* Compare WCHAR strings up to n characters

(cherry picked from commit 8178ed26a459356ece17414c6e871a7e0735a4ec)
---
 winpr/include/winpr/string.h |  2 ++
 winpr/libwinpr/crt/string.c  | 15 ++++++++++++++-
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/winpr/include/winpr/string.h b/winpr/include/winpr/string.h
index 8ce83bc1d..3b907c444 100644
--- a/winpr/include/winpr/string.h
+++ b/winpr/include/winpr/string.h
@@ -57,6 +57,7 @@ extern "C"
 	WINPR_API int _strnicmp(const char* string1, const char* string2, size_t count);
 
 	WINPR_API int _wcscmp(const WCHAR* string1, const WCHAR* string2);
+	WINPR_API int _wcsncmp(const WCHAR* string1, const WCHAR* string2, size_t count);
 
 	WINPR_API size_t _wcslen(const WCHAR* str);
 	WINPR_API size_t _wcsnlen(const WCHAR* str, size_t maxNumberOfElements);
@@ -70,6 +71,7 @@ extern "C"
 #else
 
 #define _wcscmp wcscmp
+#define _wcsncmp wcsncmp
 #define _wcslen wcslen
 #define _wcsnlen wcsnlen
 #define _wcschr wcschr
diff --git a/winpr/libwinpr/crt/string.c b/winpr/libwinpr/crt/string.c
index 37fcb4b25..c25ffa279 100644
--- a/winpr/libwinpr/crt/string.c
+++ b/winpr/libwinpr/crt/string.c
@@ -90,7 +90,20 @@ int _wcscmp(const WCHAR* string1, const WCHAR* string2)
 
 	Data_Read_UINT16(string1, value1);
 	Data_Read_UINT16(string2, value2);
-	return value1 - value2;
+	return (int)value1 - value2;
+}
+
+int _wcsncmp(const WCHAR* string1, const WCHAR* string2, size_t count)
+{
+	for (size_t x = 0; x < count; x++)
+	{
+		const WCHAR a = string1[x];
+		const WCHAR b = string2[x];
+
+		if (a != b)
+			return (int)a - b;
+	}
+	return 0;
 }
 
 /* _wcslen -> wcslen */
-- 
2.37.1