From 79657a4b4d4a7898bca0737a0c0ac5664ab1cdee Mon Sep 17 00:00:00 2001
From: Mike Black W9MDB <mdblack98@yahoo.com>
Date: Tue, 11 Jul 2023 11:02:03 -0500
Subject: [PATCH] Ensure bytes_read is updated when errors occur during Windows
 serial i/o

---
 src/iofunc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/iofunc.c b/src/iofunc.c
index 4be5d5633..9f4bd3cf1 100644
--- a/src/iofunc.c
+++ b/src/iofunc.c
@@ -555,10 +555,12 @@ static int port_read_sync_data(hamlib_port_t *p, void *buf, size_t count)
         {
         case ERROR_SUCCESS:
             // No error?
+            bytes_read = 0;
             break;
 
         case ERROR_IO_PENDING:
             // Shouldn't happen?
+            bytes_read = 0;
             return -RIG_ETIMEOUT;
 
         default: