1 files changed, 13 insertions, 5 deletions

diff --git a/listbas.c b/listbas.c
index 7421816..fd7d8aa 100644
--- a/listbas.c
+++ b/listbas.c
@@ -19,7 +19,8 @@
 #define C_PURPLE  5
 #define C_CYAN    6
 
-int immediate = 0, utf8 = 1, magazine = 0, inv = 0, color = 1, bold = 0;
+int immediate = 0, utf8 = 1, magazine = 0, inv = 0,
+	 color = 1, bold = 0, badtok = 0;
 
 const char **table = ata2utf;
 
@@ -200,10 +201,12 @@ CALLBACK(print_cmd) {
 	if(tok == CMD_ILET) return;
 
 	if(color) color_on(C_YELLOW);
-	if(tok > last_command || (!(name = commands[tok])))
+	if(tok > last_command || (!(name = commands[tok]))) {
 		fprintf(outfh, "(bad cmd token $%02x) ", tok);
-	else
+		badtok = 1;
+	} else {
 		fprintf(outfh, "%s ", name);
+	}
 	if(color) color_off();
 }
 
@@ -232,10 +235,12 @@ CALLBACK(print_op) {
 		else
 			color_on(C_GREEN);
 	}
-	if(tok > last_operator || (!(name = operators[tok])))
+	if(tok > last_operator || (!(name = operators[tok]))) {
 		fprintf(outfh, "(bad op token $%02x)", tok);
-	else
+		badtok = 1;
+	} else {
 		fprintf(outfh, "%s", name);
+	}
 	if(color) color_off();
 }
 
@@ -316,5 +321,8 @@ int main(int argc, char **argv) {
 	setup_outfh();
 	list();
 
+	if(badtok)
+		die("program has unknown tokens; maybe Turbo BASIC or BASIC XL/XE?");
+
 	return 0;
 }