[rtems-libbsd commit] Add libkern/fls.c for fls() - Find last bit set

[Joel Sherrill]

Module:    rtems-libbsd
Branch:    master
Commit:    c4117bb99c29b26a7a8d274902d9080abb5c59c9
Changeset: http://git.rtems.org/rtems-libbsd/commit/?id=c4117bb99c29b26a7a8d274902d9080abb5c59c9

Author:    Joel Sherrill <joel.sherrill at oarcorp.com>
Date:      Mon Apr 16 11:00:02 2012 -0500

Add libkern/fls.c for fls() - Find last bit set

---

 Makefile              |    1 +
 freebsd-to-rtems.py   |    1 +
 freebsd/libkern/fls.c |   50 +++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 52 insertions(+), 0 deletions(-)

diff --git a/Makefile b/Makefile
index de2234e..c63bdb4 100644
--- a/Makefile
+++ b/Makefile
@@ -18,6 +18,7 @@ C_FILES = \
 	freebsd/kern/subr_eventhandler.c \
 	freebsd/kern/kern_subr.c \
 	freebsd/kern/kern_tc.c \
+	freebsd/libkern/fls.c \
 	freebsd/net/bridgestp.c \
 	freebsd/net/ieee8023ad_lacp.c \
 	freebsd/net/if_atmsubr.c \
diff --git a/freebsd-to-rtems.py b/freebsd-to-rtems.py
index f1300c2..2c435d8 100755
--- a/freebsd-to-rtems.py
+++ b/freebsd-to-rtems.py
@@ -1376,6 +1376,7 @@ net.addSourceFiles(
 		'kern/subr_eventhandler.c',
 		'kern/kern_subr.c',
 		'kern/kern_tc.c',
+		'libkern/fls.c',
 		'net/bridgestp.c',
 		'net/ieee8023ad_lacp.c',
 		'net/if_atmsubr.c',
diff --git a/freebsd/libkern/fls.c b/freebsd/libkern/fls.c
new file mode 100644
index 0000000..e350c53
--- /dev/null
+++ b/freebsd/libkern/fls.c
@@ -0,0 +1,50 @@
+#include <freebsd/machine/rtems-bsd-config.h>
+
+/*-
+ * Copyright (c) 1990, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <freebsd/sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <freebsd/sys/libkern.h>
+
+/*
+ * Find Last Set bit
+ */
+int
+fls(int mask)
+{
+	int bit;
+
+	if (mask == 0)
+		return (0);
+	for (bit = 1; mask != 1; bit++)
+		mask = (unsigned int)mask >> 1;
+	return (bit);
+}