Improve parsing, make stdin / stdout port optional

1 files changed, 4 insertions, 3 deletions

diff --git a/tis-as.c b/tis-as.c
index 7b4a640..1a14a64 100644
--- a/tis-as.c
+++ b/tis-as.c
@@ -50,13 +50,14 @@ main(int argc, const char **argv)
 
 	tis.stdin_port.out = -1;
 	idle = false;
-	while (!idle || !prev_idle || tis.stdin_port.reading && !feof(tis_stdin)) {
-		if (tis.stdin_port.out < 0) {
+	while (!idle || !prev_idle || tis.stdin_port.attached
+			&& tis.stdin_port.reading && !feof(tis_stdin)) {
+		if (tis.stdin_port.attached && tis.stdin_port.out < 0) {
 			c = getc(tis_stdin);
 			if (c >= 0) tis.stdin_port.out = c;
 		}
 
-		if (tis.stdout_port.in >= 0) {
+		if (tis.stdout_port.attached && tis.stdout_port.in >= 0) {
 			putc(tis.stdout_port.in, tis_stdout);
 			tis.stdout_port.in = -1;
 		}