From b6d97b691ed11c322ca8c20d3329302b58d5e706 Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Sun, 27 Mar 1994 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 1994-03-27

---
 carrera/main.c |  2 +-
 port/portfns.h |  1 +
 port/qio.c     | 14 ++++++++++++++
 3 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/carrera/main.c b/carrera/main.c
index 0b49638155c3d9995cb2241efce186b0b06f17da..118f48451fcd837c545be053d08bec1f27eddda1 100644
--- a/carrera/main.c
+++ b/carrera/main.c
@@ -503,7 +503,7 @@ rdbginit(void)
 {
 	uchar *vec;
 	ulong jba;
-
+return;
 	/* Only interested in the PC */
 	Mipsjmpbuf.pc = 0x8001C020;
 
diff --git a/port/portfns.h b/port/portfns.h
index a35efc7ad40641cd16cadf4d748d62c16091db2a..d25887481b75ed21d635ef987001e02fe98f67d6 100644
--- a/port/portfns.h
+++ b/port/portfns.h
@@ -204,6 +204,7 @@ int		qproduce(Queue*, void*, int);
 long		qread(Queue*, void*, int);
 void		qreopen(Queue*);
 void		qunlock(QLock*);
+int		qwindow(Queue*);
 long		qwrite(Queue*, void*, int, int);
 int		readnum(ulong, char*, ulong, ulong, int);
 int		readstr(ulong, char*, ulong, char*);
diff --git a/port/qio.c b/port/qio.c
index 4a51ec131e53474b2933e5045798673a4cd90dfd..748582e21a6c66f9841a6dbadf227d539118d143 100644
--- a/port/qio.c
+++ b/port/qio.c
@@ -655,6 +655,20 @@ qlen(Queue *q)
 	return q->len;
 }
 
+/*
+ * return space remaining before flow control
+ */
+int
+qwindow(Queue *q)
+{
+	int l;
+
+	l = q->limit - q->len;
+	if(l < 0)
+		l = 0;
+	return l;
+}
+
 /*
  *  return true if we can read without blocking
  */