From eda2e11d3124d64292a11765398e083bdc7b0dae Mon Sep 17 00:00:00 2001
From: Calvin Rose <calsrose@gmail.com>
Date: Wed, 28 Jan 2026 10:51:18 -0600
Subject: [PATCH] MSVC and windows clib does not like fopen(NULL, ...)

We were exploiting this behavior on posix when adding shell history for
the built-in readline functionality.
---
 src/mainclient/shell.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/mainclient/shell.c b/src/mainclient/shell.c
index a6fa79ec..497fb33a 100644
--- a/src/mainclient/shell.c
+++ b/src/mainclient/shell.c
@@ -445,6 +445,7 @@ static void loadhistory(void) {
     if (gbl_history_loaded) return;
     calc_history_file();
     gbl_history_loaded = 1;
+    if (NULL == gbl_history_file) return;
     FILE *history_file = fopen(gbl_history_file, "rb");
     if (NULL == history_file) return;
     JanetParser p;