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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <chars.h>
include "tty.h"
# TTYCLEAR -- Clear the terminal screen.
procedure ttyclear (fd, tty)
int fd
pointer tty
int status
bool ttygetb()
int ttyctrl()
errchk ttygetb, ttyctrl
begin
# If hardcopy terminal, output formfeed instead of clear.
if (ttygetb (tty, "ht"))
status = ttyctrl (fd, tty, "ff", T_NLINES(tty))
else
status = ERR
if (status == ERR)
status = ttyctrl (fd, tty, "cl", T_NLINES(tty))
# If ff or cl capability not found, the best we can do is output
# a newline.
if (status == ERR)
call putline (fd, "\n")
end
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