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authordes <des@FreeBSD.org>2004-01-13 16:05:47 +0000
committerdes <des@FreeBSD.org>2004-01-13 16:05:47 +0000
commitec1fd605cbbcb4bc5ec851a6775a363b01d56029 (patch)
treeec554f27ccb99efb17cf19602b6279f86f0db08b /lib/libc/string/ffsl.c
parentdfa545653779c51e8c959ed4a6ebb441f043566c (diff)
downloadFreeBSD-src-ec1fd605cbbcb4bc5ec851a6775a363b01d56029.zip
FreeBSD-src-ec1fd605cbbcb4bc5ec851a6775a363b01d56029.tar.gz
Add and document ffsl(), fls() and flsl().
Diffstat (limited to 'lib/libc/string/ffsl.c')
-rw-r--r--lib/libc/string/ffsl.c52
1 files changed, 52 insertions, 0 deletions
diff --git a/lib/libc/string/ffsl.c b/lib/libc/string/ffsl.c
new file mode 100644
index 0000000..a0d81d1
--- /dev/null
+++ b/lib/libc/string/ffsl.c
@@ -0,0 +1,52 @@
+/*-
+ * 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.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 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 <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <strings.h>
+
+/*
+ * Find First Set bit
+ */
+int
+ffsl(long mask)
+{
+ int bit;
+
+ if (mask == 0)
+ return(0);
+ for (bit = 1; !(mask & 1); bit++)
+ (unsigned long)mask >>= 1;
+ return (bit);
+}
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