From c3b411fb6b99e91f6f8582f699345806099facf2 Mon Sep 17 00:00:00 2001
From: Jeffrey Pfau <jeffrey@endrift.com>
Date: Thu, 18 Aug 2016 00:04:07 -0700
Subject: [PATCH] Util: Fix wrap condition on RingFIFORead if it's empty

---
 src/util/ring-fifo.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/util/ring-fifo.c b/src/util/ring-fifo.c
index ce641e63f..1cb0aedac 100644
--- a/src/util/ring-fifo.c
+++ b/src/util/ring-fifo.c
@@ -75,6 +75,10 @@ size_t RingFIFORead(struct RingFIFO* buffer, void* output, size_t length) {
 
 	// Wrap around if we can't fit enough in here
 	if ((intptr_t) data - (intptr_t) buffer->data + length >= buffer->capacity) {
+		if (end == data) {
+			// Oops! If we wrap now, it'll appear full
+			return 0;
+		}
 		data = buffer->data;
 	}