From f2152102de3a7eb8fe357f112e6f9fab3860cdc7 Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Fri, 26 Mar 1993 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 1993-03-26

---
 pc/devuart.c | 28 +++++++++++++++++++++++++++-
 1 file changed, 27 insertions(+), 1 deletion(-)

diff --git a/pc/devuart.c b/pc/devuart.c
index c9931e5b6ceb6bfd7d45426cf13b2a37a25dffa6..d2ea4c28a00980f795f2c65e2783eea2e1e62a9c 100644
--- a/pc/devuart.c
+++ b/pc/devuart.c
@@ -799,6 +799,31 @@ uartclose(Chan *c)
 		streamclose(c);
 }
 
+long
+uartstatus(Uart *up, void *buf, long n, ulong offset)
+{
+	uchar mstat;
+	uchar tstat;
+	char str[128];
+
+	str[0] = 0;
+	tstat = up->sticky[Mctl];
+	mstat = uartrdreg(up, Mstat);
+	if(mstat & Cts)
+		strcat(str, " cts");
+	if(mstat & Dsr)
+		strcat(str, " dsr");
+	if(mstat & Ring)
+		strcat(str, " ring");
+	if(mstat & Dcd)
+		strcat(str, " dcd");
+	if(tstat & Dtr)
+		strcat(str, " dtr");
+	if(tstat & Dtr)
+		strcat(str, " rts");
+	return readstr(offset, buf, n, str);
+}
+
 long
 uartread(Chan *c, void *buf, long n, ulong offset)
 {
@@ -807,8 +832,9 @@ uartread(Chan *c, void *buf, long n, ulong offset)
 	case Qdir:
 		return devdirread(c, buf, n, uartdir, NUart, devgen);
 	case Qeia1ctl:
+		return uartstatus(&uart[1], buf, n, offset);
 	case Qeia0ctl:
-		return 0;
+		return uartstatus(&uart[0], buf, n, offset);
 	}
 	return streamread(c, buf, n);
 }