From 15003d1b0abccc8bcef84386c4a6da176e41f883 Mon Sep 17 00:00:00 2001
From: Anton Kling <anton@kling.gg>
Date: Sun, 9 Jun 2024 22:05:53 +0200
Subject: Add UDP

---
 kernel/lib/ringbuffer.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

(limited to 'kernel/lib/ringbuffer.c')

diff --git a/kernel/lib/ringbuffer.c b/kernel/lib/ringbuffer.c
index 9caf555..643e6b9 100644
--- a/kernel/lib/ringbuffer.c
+++ b/kernel/lib/ringbuffer.c
@@ -74,9 +74,11 @@ u32 ringbuffer_read(struct ringbuffer *rb, u8 *buffer, u32 len) {
     }
     read_len = min(len, read_len);
 
-    memcpy(buffer, rb->buffer + rb->read_ptr, read_len);
+    if (buffer) {
+      memcpy(buffer, rb->buffer + rb->read_ptr, read_len);
+      buffer += read_len;
+    }
     len -= read_len;
-    buffer += read_len;
     rb->read_ptr = (rb->read_ptr + read_len) % rb->buffer_size;
   }
   return orig_len - len;
-- 
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