From fcf7ec6c12723009e4ad683841b46d0346c73934 Mon Sep 17 00:00:00 2001
From: gameblabla <gameblabla@openmailbox.org>
Date: Thu, 18 Jul 2019 02:12:23 +0200
Subject: [PATCH] psxbios : Add checks to index and rindex calls

Return 0 for index/rindex if src is 0x00.
---
 libpcsxcore/psxbios.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/libpcsxcore/psxbios.c b/libpcsxcore/psxbios.c
index 010a229b..67a01e5a 100644
--- a/libpcsxcore/psxbios.c
+++ b/libpcsxcore/psxbios.c
@@ -610,7 +610,13 @@ void psxBios_strlen() { // 0x1b
 
 void psxBios_index() { // 0x1c
 	char *p = (char *)Ra0;
-
+	if (a0 == 0)
+	{
+		v0 = 0;
+		pc0 = ra;
+		return;
+	}
+	
 	do {
 		if (*p == a1) {
 			v0 = a0 + (p - (char *)Ra0);
@@ -626,7 +632,11 @@ void psxBios_rindex() { // 0x1d
 	char *p = (char *)Ra0;
 
 	v0 = 0;
-
+	if (a0 == 0)
+	{
+		pc0 = ra;
+		return;
+	}
 	do {
 		if (*p == a1)
 			v0 = a0 + (p - (char *)Ra0);
-- 
2.39.2