From dfa70b3677cfee4e538e9f0b8d10b339bc9a4501 Mon Sep 17 00:00:00 2001
From: Anton Dorozhkin <Doliman100@gmail.com>
Date: Sun, 30 Nov 2025 13:40:34 +0700
Subject: [PATCH] [Kernel] Change _vsnprintf overflow behavior.

---
 src/xenia/kernel/xboxkrnl/xboxkrnl_strings.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/xenia/kernel/xboxkrnl/xboxkrnl_strings.cc b/src/xenia/kernel/xboxkrnl/xboxkrnl_strings.cc
index 1554e30ff..4e5c9c8f3 100644
--- a/src/xenia/kernel/xboxkrnl/xboxkrnl_strings.cc
+++ b/src/xenia/kernel/xboxkrnl/xboxkrnl_strings.cc
@@ -1025,8 +1025,9 @@ SHIM_CALL _vsnprintf_entry(PPCContext* ppc_context) {
       buffer[count] = '\0';
     }
   } else {
-    // Overflowed buffer. We still return the count we would have written.
+    // Overflowed buffer.
     std::memcpy(buffer, data.str().c_str(), buffer_count);
+    count = -1;
   }
   SHIM_SET_RETURN_32(count);
 }