/usr/src/openafs-1.8.0pre5/include/opr/ffs.h is in openafs-modules-dkms 1.8.0~pre5-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Copyright (C) 2014 by the Massachusetts Institute of Technology.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * 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.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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
* COPYRIGHT HOLDER 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.
*/
/*
* This contains portable implementations of the BSD ffs() suite of functions,
* which locate the first or last bit set in a bit string.
*/
#ifndef OPENAFS_OPR_FFS_H
#define OPENAFS_OPR_FFS_H
static_inline int
opr_ffs(int value)
{
afs_int32 i;
afs_uint32 tmp = value;
if (tmp == 0)
return 0;
/* This loop must terminate because tmp is nonzero and thus has at least
* one bit set. */
for (i = 1;; ++i) {
if (tmp & 1u)
return i;
else
tmp >>= 1;
}
/* NOTREACHED */
}
static_inline int
opr_ffsll(long long value)
{
afs_int32 i;
afs_uint64 tmp = value;
if (tmp == 0)
return 0;
/* This loop must terminate because tmp is nonzero and thus has at least
* one bit set. */
for (i = 1;; ++i) {
if (tmp & 1ull)
return i;
else
tmp >>= 1;
}
/* NOTREACHED */
}
static_inline int
opr_fls(int value)
{
afs_int32 i;
/* tmp must be unsigned to avoid undefined behavior. */
afs_uint32 tmp = value;
if (tmp == 0)
return 0;
/* This loop must terminate because tmp is nonzero and thus has at least
* one bit set. */
for (i = 32;; --i) {
if (tmp & 0x80000000u)
return i;
else
tmp <<= 1;
}
/* NOTREACHED */
}
static_inline int
opr_flsll(long long value)
{
afs_int32 i;
/* tmp must be unsigned to avoid undefined behavior. */
afs_uint64 tmp = value;
if (tmp == 0)
return 0;
/* This loop must terminate because tmp is nonzero and thus has at least
* one bit set. */
for (i = 64;; --i) {
if (tmp & 0x8000000000000000ull)
return i;
else
tmp <<= 1;
}
/* NOTREACHED */
}
#endif /* OPENAFS_OPR_FFS_H */
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