From c1f9bd293133eb46e94c0be63bf256e6a0b32b42 Mon Sep 17 00:00:00 2001
From: AnyOldName3 <krizdjali@gmail.com>
Date: Tue, 27 Jan 2026 00:28:49 +0000
Subject: [PATCH] Fix DebugOutput

https://gitlab.com/OpenMW/openmw/-/issues/8944
---
 components/debug/debugging.cpp | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/components/debug/debugging.cpp b/components/debug/debugging.cpp
index 6a6f044eee..9ada024431 100644
--- a/components/debug/debugging.cpp
+++ b/components/debug/debugging.cpp
@@ -173,10 +173,7 @@ namespace Debug
                 return All;
             }
 
-            virtual std::streamsize writeImpl(const char* str, std::streamsize size, Level debugLevel)
-            {
-                return size;
-            }
+            virtual std::streamsize writeImpl(const char* str, std::streamsize size, Level debugLevel) { return size; }
         };
 
 #if defined _WIN32 && defined _DEBUG
@@ -185,10 +182,16 @@ namespace Debug
         public:
             std::streamsize writeImpl(const char* str, std::streamsize size, Level debugLevel)
             {
-                // Make a copy for null termination
-                std::string tmp(str, static_cast<unsigned int>(size));
+                if (size > std::numeric_limits<int>::max())
+                    OutputDebugStringW(L"Next line truncated...");
+                auto wideSize = MultiByteToWideChar(CP_UTF8, 0, str,
+                    static_cast<int>(std::min<std::streamsize>(size, std::numeric_limits<int>::max())), nullptr, 0);
+                std::wstring wide(wideSize, L'\0');
+                MultiByteToWideChar(CP_UTF8, 0, str,
+                    static_cast<int>(std::min<std::streamsize>(size, std::numeric_limits<int>::max())), wide.data(),
+                    wideSize);
                 // Write string to Visual Studio Debug output
-                OutputDebugString(tmp.c_str());
+                OutputDebugStringW(wide.c_str());
                 return size;
             }