From eda25abd3d199316b20c9a8df96cc64302a68216 Mon Sep 17 00:00:00 2001
From: Thomas Harte <thomas.harte@gmail.com>
Date: Tue, 29 Sep 2015 22:04:09 -0400
Subject: [PATCH] Ensured we get a read handle if we can't get one for
 updating.

---
 CPM for OS X/BDOS/BDOS.m | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/CPM for OS X/BDOS/BDOS.m b/CPM for OS X/BDOS/BDOS.m
index c553882..e68cd4d 100644
--- a/CPM for OS X/BDOS/BDOS.m	
+++ b/CPM for OS X/BDOS/BDOS.m	
@@ -517,7 +517,9 @@ - (BOOL)renameFileWithParameter:(uint16_t)parameter
 - (BOOL)openFileWithParameter:(uint16_t)parameter
 {
 	return [self establishHandleWithParameter:parameter creator:^NSFileHandle *(NSString *path) {
-		return [NSFileHandle fileHandleForUpdatingAtPath:path];
+		NSFileHandle *readWriteHandle = [NSFileHandle fileHandleForUpdatingAtPath:path];
+		if(readWriteHandle) return readWriteHandle;
+		return [NSFileHandle fileHandleForReadingAtPath:path];
 	}];
 }