From c3af10029d3b31c8d3beb5d7521cc87d2725520f Mon Sep 17 00:00:00 2001
From: Florian Loitsch <florian@toit.io>
Date: Wed, 23 Oct 2024 12:42:54 +0200
Subject: [PATCH] No HOST_NAME_MAX.

---
 src/primitive_core.cc | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/primitive_core.cc b/src/primitive_core.cc
index 5acb31ccc..eda91b943 100644
--- a/src/primitive_core.cc
+++ b/src/primitive_core.cc
@@ -2577,11 +2577,14 @@ PRIMITIVE(hostname) {
 #ifdef TOIT_ESP32
   name = CONFIG_LWIP_LOCAL_HOSTNAME;
 #else
-  char buffer[HOST_NAME_MAX + 1];
+  // HOST_NAME_MAX (set to 64 on my system) is not available on all platforms.
+  // We use a reasonable default.
+  char buffer[256];
   int result = gethostname(buffer, sizeof(buffer));
   if (result != 0) {
     return Primitive::os_error(errno, process);
   }
+  buffer[sizeof(buffer) - 1] = '\0';
   name = buffer;
 #endif
   return process->allocate_string_or_error(name);