From b0b8d14a2c93ad475d406b43a814841426d9924b Mon Sep 17 00:00:00 2001
From: safarp <safar.pavel@gmail.com>
Date: Sun, 20 Mar 2022 08:52:56 +0100
Subject: [PATCH] LibC: Automatically append null terminator in vswprintf

---
 Userland/Libraries/LibC/wstdio.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Userland/Libraries/LibC/wstdio.cpp b/Userland/Libraries/LibC/wstdio.cpp
index 041afece5f..61e59b3332 100644
--- a/Userland/Libraries/LibC/wstdio.cpp
+++ b/Userland/Libraries/LibC/wstdio.cpp
@@ -207,6 +207,10 @@ int vswprintf(wchar_t* __restrict wcs, size_t max_length, wchar_t const* __restr
         ++length_so_far;
     },
         wcs, fmt, args);
+    if (length_so_far < max_length)
+        wcs[length_so_far] = L'\0';
+    else
+        wcs[max_length - 1] = L'\0';
     return static_cast<int>(length_so_far);
 }