unprotbas: do not try to read tokenized BASIC from stdin if it's a terminal.

1 files changed, 4 insertions, 1 deletions

diff --git a/unprotbas.c b/unprotbas.c
index 1697aa8..4ed831f 100644
--- a/unprotbas.c
+++ b/unprotbas.c
@@ -633,6 +633,9 @@ FILE *open_file(const char *name, const char *mode) {
 
 void open_input(const char *name) {
 	if(!name) {
+		if(isatty(fileno(stdin))) {
+			die("can't read binary data from the terminal");
+		}
 		if(freopen(NULL, "rb", stdin)) {
 			input_file = stdin;
 			return;
@@ -648,7 +651,7 @@ void open_input(const char *name) {
 void open_output(const char *name) {
 	if(!name) {
 		if(isatty(fileno(stdout))) {
-			die("refusing to write binary data to standard output");
+			die("refusing to write binary data to the terminal");
 		}
 		if(freopen(NULL, "wb", stdout)) {
 			output_file = stdout;