From ec42f864d4a420b66c6a02ccc43846d05e50553e Mon Sep 17 00:00:00 2001
From: Linus Groh <mail@linusgroh.de>
Date: Mon, 18 Jan 2021 09:57:12 +0100
Subject: [PATCH] LibC: Add wcsncmp()

Taken from strncmp(), like wcscmp() in ef40ebb. :^)
---
 Userland/Libraries/LibC/wchar.cpp | 13 +++++++++++++
 Userland/Libraries/LibC/wchar.h   |  1 +
 2 files changed, 14 insertions(+)

diff --git a/Userland/Libraries/LibC/wchar.cpp b/Userland/Libraries/LibC/wchar.cpp
index 54cfdacda46..8c1653e164b 100644
--- a/Userland/Libraries/LibC/wchar.cpp
+++ b/Userland/Libraries/LibC/wchar.cpp
@@ -61,6 +61,19 @@ int wcscmp(const wchar_t* s1, const wchar_t* s2)
     return *(const wchar_t*)s1 - *(const wchar_t*)--s2;
 }
 
+int wcsncmp(const wchar_t* s1, const wchar_t* s2, size_t n)
+{
+    if (!n)
+        return 0;
+    do {
+        if (*s1 != *s2++)
+            return *(const wchar_t*)s1 - *(const wchar_t*)--s2;
+        if (*s1++ == 0)
+            break;
+    } while (--n);
+    return 0;
+}
+
 wchar_t* wcschr(const wchar_t* str, int c)
 {
     wchar_t ch = c;
diff --git a/Userland/Libraries/LibC/wchar.h b/Userland/Libraries/LibC/wchar.h
index c6ab5b29652..1f7d8d6c76f 100644
--- a/Userland/Libraries/LibC/wchar.h
+++ b/Userland/Libraries/LibC/wchar.h
@@ -39,6 +39,7 @@ size_t wcslen(const wchar_t*);
 wchar_t* wcscpy(wchar_t*, const wchar_t*);
 wchar_t* wcsncpy(wchar_t*, const wchar_t*, size_t);
 int wcscmp(const wchar_t*, const wchar_t*);
+int wcsncmp(const wchar_t*, const wchar_t*, size_t);
 wchar_t* wcschr(const wchar_t*, int);
 const wchar_t* wcsrchr(const wchar_t*, wchar_t);
 wchar_t* wcscat(wchar_t*, const wchar_t*);