From e4c4de94b89823f4b0939ba1025504e26d711e01 Mon Sep 17 00:00:00 2001
From: Max Wash <mbswash@gmail.com>
Date: Wed, 30 Jul 2025 18:25:17 +0100
Subject: [PATCH] core: ringbuffer: reset read and write pointers to 0 when a
 read buffer consumes all available data

---
 core/ringbuffer.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/core/ringbuffer.c b/core/ringbuffer.c
index ffcb6dc..d488fc2 100644
--- a/core/ringbuffer.c
+++ b/core/ringbuffer.c
@@ -289,6 +289,14 @@ enum b_status b_ringbuffer_close_read_buffer(
 		buf->r_read_ptr = 0;
 	}
 
+	if (buf->r_read_ptr == buf->r_write_ptr) {
+		/* the ringbuffer is now empty. set both pointers to 0.
+		 * this ensures that the whole buffer will be available
+		 * contiguously to the next call to open_write_buffer */
+		buf->r_read_ptr = 0;
+		buf->r_write_ptr = 0;
+	}
+
 	buf->r_opened_buf = NULL;
 	buf->r_opened_capacity = 0;
 	buf->r_flags &= ~B_RINGBUFFER_READ_LOCKED;