From 4b72993e746bc654178ba80b66ed6a1f854210e1 Mon Sep 17 00:00:00 2001
From: "B. Watson" <urchlay@slackware.uk>
Date: Mon, 15 Jul 2024 14:36:57 -0400
Subject: bas.c: warn and return from walk_code() if the program ends in the
 middle of a line.

---
 bas.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'bas.c')

diff --git a/bas.c b/bas.c
index ddc424f..94ba310 100644
--- a/bas.c
+++ b/bas.c
@@ -316,6 +316,10 @@ void walk_code(unsigned int startlineno, unsigned int endlineno) {
 		lineno = tmpno;
 		offset = program[linepos + 2];
 		nextpos = linepos + offset;
+		if(nextpos > filelen) {
+			fprintf(stderr, "Warning: program truncated in the middle of line %d.\n", lineno);
+			return;
+		}
 
 		end = nextpos;
 		pos = linepos;
-- 
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