1 files changed, 31 insertions, 0 deletions
diff --git a/sys/tty/ttydelay.x b/sys/tty/ttydelay.x
new file mode 100644
index 00000000..7fc6b3d4
--- /dev/null
+++ b/sys/tty/ttydelay.x
@@ -0,0 +1,31 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include "tty.h"
+
+# TTYDELAY -- Output a sequence of pad characters to create a delay, giving
+# the terminal time to complete some operation before being passed the next
+# request.
+
+procedure ttydelay (fd, tty, delay)
+
+int	fd			# output file
+pointer	tty			# tty descriptor
+int	delay			# desired milliseconds of delay
+
+int	padchar, npadchars
+real	msec_per_char
+int	and()
+
+begin
+	# Add padding if needed to generate delay.  (8 = nbits per char,
+	# baud is in units of bits per second).
+
+	if (delay > 0 && T_BAUD(tty) > 0) {
+	    padchar = and (T_PADCHAR(tty), 177B)
+	    msec_per_char = real(8 * 1000) / real(T_BAUD(tty)) 
+	    npadchars = int (delay / msec_per_char + 0.5)
+
+	    for (;  npadchars > 0;  npadchars = npadchars - 1)
+		call putci (fd, padchar)
+	}
+end