1 files changed, 56 insertions, 0 deletions
diff --git a/usr/src/common/util/ffs.c b/usr/src/common/util/ffs.c
new file mode 100644
index 0000000000..b37c661b82
--- /dev/null
+++ b/usr/src/common/util/ffs.c
@@ -0,0 +1,56 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+
+/*
+ * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+/*
+ * Common implementation of ffs for kernel, mdb, and libc.  Note that mdb
+ * renames ffs into mdb_ffs to avoid user-space clashes with the signature of
+ * ffs(3C).
+ */
+
+#if defined(_KERNEL) || defined(ffs)
+#include <sys/int_types.h>
+#define	arg_t	uintmax_t
+#else
+#pragma weak ffs = _ffs
+#define	arg_t	int
+#include "synonyms.h"
+#endif
+
+int
+ffs(arg_t bits)
+{
+	int i;
+
+	if (bits == 0)
+		return (0);
+	for (i = 1; ; i++, bits >>= 1) {
+		if (bits & 1)
+			break;
+	}
+	return (i);
+}