1 files changed, 10 insertions, 0 deletions
diff --git a/listbas.c b/listbas.c
index 86bb3f7..bc56695 100644
--- a/listbas.c
+++ b/listbas.c
@@ -196,6 +196,12 @@ void close_outfh(void) {
 	}
 }
 
+CALLBACK(code_prot) {
+	fprintf(stderr, "%s: Program is code-protected, stopping at line %d.\n", self, lineno);
+	close_outfh();
+	exit(0);
+}
+
 void list(void) {
 	on_start_line = print_lineno;
 	on_cmd_token = print_cmd;
@@ -203,6 +209,7 @@ void list(void) {
 	on_var_token = print_varname;
 	on_end_line = print_newline;
 	on_text = print_text;
+	on_bad_line_length = code_prot;
 	walk_code(0, 32767 + immediate);
 }
 
@@ -214,6 +221,9 @@ int main(int argc, char **argv) {
 	readfile();
 	parse_header();
 
+	if(!vntable_ok())
+		die("Program is variable-protected; unprotect it first.");
+
 	setup_outfh();
 	list();
 	close_outfh();