add blktochr()

1 files changed, 19 insertions, 1 deletions

diff --git a/sys/arch/alpha/alpha/conf.c b/sys/arch/alpha/alpha/conf.c
index 6cb3cb311a0..f2a566cfda7 100644
--- a/sys/arch/alpha/alpha/conf.c
+++ b/sys/arch/alpha/alpha/conf.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: conf.c,v 1.8 1996/10/30 22:38:00 niklas Exp $	*/
+/*	$OpenBSD: conf.c,v 1.9 1996/11/06 02:01:08 deraadt Exp $	*/
 /*	$NetBSD: conf.c,v 1.16 1996/10/18 21:26:57 cgd Exp $	*/
 
 /*-
@@ -270,3 +270,21 @@ chrtoblk(dev)
 		return (NODEV);
 	return (makedev(blkmaj, minor(dev)));
 }
+
+/*
+ * Convert a character device number to a block device number.
+ */
+dev_t
+blktochr(dev)
+	dev_t dev;
+{
+	int blkmaj = major(dev);
+	int i;
+
+	if (blkmaj >= nblkdev)
+		return (NODEV);
+	for (i = 0; i < sizeof(chrtoblktbl)/sizeof(chrtoblktbl[0]); i++)
+		if (blkmaj == chrtoblktbl[i])
+			return (makedev(i, minor(dev)));
+	return (NODEV);
+}