From 6e4034a92dc77d3d8100c71abbb58308f8f572e3 Mon Sep 17 00:00:00 2001
From: Jonathan <74002342+jd-imi@users.noreply.github.com>
Date: Fri, 27 Sep 2024 00:06:09 +0200
Subject: [PATCH] Fixed a warning emitted from arm-none-eabi-gcc in hostnport.c
 (#785)

---
 src/bacnet/hostnport.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/bacnet/hostnport.c b/src/bacnet/hostnport.c
index 748118c3..c12ae14a 100644
--- a/src/bacnet/hostnport.c
+++ b/src/bacnet/hostnport.c
@@ -708,7 +708,7 @@ bool bacnet_bdt_entry_from_ascii(BACNET_BDT_ENTRY *value, const char *argv)
             p = 0xBAC0U;
         }
         name = argv;
-        if (name && isalnum(name[0])) {
+        if (name && isalnum((unsigned char)name[0])) {
             value->bbmd_address.host_ip_address = false;
             value->bbmd_address.host_name = true;
             characterstring_init(