From c51d5ab188ee1b1b6a52b4aa8baaf269ce01451b Mon Sep 17 00:00:00 2001
From: bde <bde@FreeBSD.org>
Date: Sat, 14 Sep 1996 04:27:46 +0000
Subject: Changed cncheckc() interface so that it is 8-bit clean - return -1
 instead of 0 if there is no input.

syscons.c:
Added missing spl locking in sccncheckc().  Return the same value as
sccngetc() would.  It is wrong for sccngetc() to return non-ASCII, but
stripping the non-ASCII bits doesn't help.
---
 sys/dev/sio/sio.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'sys/dev/sio/sio.c')

diff --git a/sys/dev/sio/sio.c b/sys/dev/sio/sio.c
index 2aa4dfc..8976cae 100644
--- a/sys/dev/sio/sio.c
+++ b/sys/dev/sio/sio.c
@@ -31,7 +31,7 @@
  * SUCH DAMAGE.
  *
  *	from: @(#)com.c	7.5 (Berkeley) 5/16/91
- *	$Id: sio.c,v 1.144 1996/07/17 22:07:23 julian Exp $
+ *	$Id: sio.c,v 1.145 1996/09/06 23:08:05 phk Exp $
  */
 
 #include "opt_comconsole.h"
@@ -2415,7 +2415,7 @@ siocncheckc(dev)
 	if (inb(iobase + com_lsr) & LSR_RXRDY)
 		c = inb(iobase + com_data);
 	else
-		c = 0;
+		c = -1;
 	siocnclose(&sp);
 	splx(s);
 	return (c);
-- 
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