From 9b541f29488f5f59cb1dd6edb54c91697e4d5172 Mon Sep 17 00:00:00 2001
From: sfan5 <sfan5@live.de>
Date: Fri, 14 Oct 2022 15:44:57 +0200
Subject: [PATCH] Fix buffer size for wchar-multibyte conversion

---
 include/irrString.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/irrString.h b/include/irrString.h
index f454aed4..d8757af8 100644
--- a/include/irrString.h
+++ b/include/irrString.h
@@ -1503,12 +1503,12 @@ static size_t wStringToMultibyte(string<c8>& destination, const wchar_t* source,
 {
 	if ( sourceSize )
 	{
-		destination.reserve(sourceSize+1);
+		destination.reserve(sizeof(wchar_t)*sourceSize+1);
 #if defined(_MSC_VER)
 #pragma warning(push)
 #pragma warning(disable: 4996)	// 'wcstombs': This function or variable may be unsafe. Consider using wcstombs_s instead.
 #endif
-		const size_t written = wcstombs(destination.array, source, (size_t)sourceSize);
+		const size_t written = wcstombs(destination.array, source, destination.allocated-1);
 #if defined(_MSC_VER)
 #pragma warning(pop)
 #endif