From e00e74b9d043fef03a3692251fb792eabfcb4cd9 Mon Sep 17 00:00:00 2001
From: Andrew Alderwick <andrew@alderwick.co.uk>
Date: Mon, 9 May 2022 21:13:28 +0100
Subject: [PATCH] (uxnasm) Raise an error if the output rom would be empty.

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

diff --git a/src/uxnasm.c b/src/uxnasm.c
index 22f5fce..1e7894e 100644
--- a/src/uxnasm.c
+++ b/src/uxnasm.c
@@ -435,6 +435,8 @@ main(int argc, char *argv[])
 		return !error("Assembly", "Failed to assemble rom.");
 	if(!(dst = fopen(argv[2], "wb")))
 		return !error("Invalid Output", argv[2]);
+	if(p.length <= TRIM)
+		return !error("Assembly", "Output rom is empty.");
 	fwrite(p.data + TRIM, p.length - TRIM, 1, dst);
 	review(argv[2]);
 	return 0;