Add scrollback support to the pcvt (i386 only) console driver.

Press LEFT_SHIFT+PGUP/PGDN to navigate. Number of buffered pages is currently
only configurable by editing sys/arch/i386/isa/pcvt/pcvt_hdr.h and changing
the SCROLLBACK_PAGES constant.

You must add "option PCVT_SCROLLBACK" to your kernel config file to enable
this support, or uncomment it from sys/arch/i386/conf/GENERIC.

Known issues:
   - Few little buglets when switching line (font) or column modes in scon(1).
   - Can't hold down LEFT_SHIFT+PGUP/PGDN keys. This will be fixed...

Idea from Linux, code by me.

1 files changed, 7 insertions, 1 deletions

diff --git a/sys/arch/i386/isa/pcvt/pcvt_drv.c b/sys/arch/i386/isa/pcvt/pcvt_drv.c
index 33f2adde5e1..1ae909417d9 100644
--- a/sys/arch/i386/isa/pcvt/pcvt_drv.c
+++ b/sys/arch/i386/isa/pcvt/pcvt_drv.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: pcvt_drv.c,v 1.22 1998/11/20 15:57:25 deraadt Exp $	*/
+/*	$OpenBSD: pcvt_drv.c,v 1.23 1999/09/06 00:12:39 aaron Exp $	*/
 
 /*
  * Copyright (c) 1992, 1995 Hellmuth Michaelis and Joerg Wunsch.
@@ -706,7 +706,13 @@ pcstart(register struct tty *tp)
 	 */
 
 	while ((len = q_to_b(&tp->t_outq, buf, PCVT_PCBURST)) != 0)
+	{
+#ifdef PCVT_SCROLLBACK
+		if (vs[minor(tp->t_dev)].scrolling)
+			sgetc(31337);
+#endif
 		sput(&buf[0], 0, len, minor(tp->t_dev));
+	}
 
 	s = spltty();