diff options
author | Patrick Georgi <patrick.georgi@secunet.com> | 2011-03-01 07:23:49 +0000 |
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committer | Patrick Georgi <patrick.georgi@coresystems.de> | 2011-03-01 07:23:49 +0000 |
commit | d08996e81f9b70b089c1648c038f035afc3511fc (patch) | |
tree | 76ae1048033dadb122960a94b22368e730815040 /payloads/libpayload/libc/strings.c | |
parent | fa622fcc5a27e58201d148263a7cb08e1a9da08a (diff) |
libpayload: Implement ffs()
Signed-off-by: Patrick Georgi <patrick.georgi@secunet.com>
Acked-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@6415 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
Diffstat (limited to 'payloads/libpayload/libc/strings.c')
-rw-r--r-- | payloads/libpayload/libc/strings.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/payloads/libpayload/libc/strings.c b/payloads/libpayload/libc/strings.c new file mode 100644 index 0000000000..9a56ba127c --- /dev/null +++ b/payloads/libpayload/libc/strings.c @@ -0,0 +1,40 @@ +/* + * This file is part of the libpayload project. + * + * Copyright (C) 2011 secunet Security Networks AG + * + * 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. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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. + */ + +int ffs(int i) +{ + int count = 1; + if (i == 0) return 0; + + while ((i & 1) != 1) { + i>>=1; + count++; + } + return count; +} |