From f42e1e9003d052bcfcadd5955d2396f11ea0f3c5 Mon Sep 17 00:00:00 2001
From: gameblabla <gameblabla@openmailbox.org>
Date: Thu, 18 Jul 2019 02:00:11 +0200
Subject: [PATCH] psxbios : Add checks for strncat

Returns 0 if src or dst is 0x00.
---
 libpcsxcore/psxbios.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/libpcsxcore/psxbios.c b/libpcsxcore/psxbios.c
index 924996a3..90c11aeb 100644
--- a/libpcsxcore/psxbios.c
+++ b/libpcsxcore/psxbios.c
@@ -493,7 +493,12 @@ void psxBios_strncat() { // 0x16
 #ifdef PSXBIOS_LOG
 	PSXBIOS_LOG("psxBios_%s: %s (%x), %s (%x), %d\n", biosA0n[0x16], Ra0, a0, Ra1, a1, a2);
 #endif
-
+	if (a0 == 0 || a1 == 0)
+	{
+		v0 = 0;
+		pc0 = ra;
+		return;
+	}
 	while (*p1++);
 	--p1;
 	while ((*p1++ = *p2++) != '\0') {
-- 
2.39.5