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6e64bc845f
osreldate.h and sys/param.h were manually adjusted to not __FreeBSD_version since it will be defined by the compiler.
394 lines
No EOL
13 KiB
C
Vendored
394 lines
No EOL
13 KiB
C
Vendored
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Paul Vixie.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* Copyright (c) 2014 Spectra Logic Corporation
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#ifndef _SYS_BITSTRING_H_
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#define _SYS_BITSTRING_H_
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#ifdef _KERNEL
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#include <sys/libkern.h>
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#include <sys/malloc.h>
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#endif
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#include <sys/types.h>
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typedef unsigned long bitstr_t;
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/*---------------------- Private Implementation Details ----------------------*/
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#define _BITSTR_MASK (~0UL)
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#define _BITSTR_BITS (sizeof(bitstr_t) * 8)
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/* round up x to the next multiple of y if y is a power of two */
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#define _bit_roundup2(x, y) \
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(((size_t)(x) + (y) - 1) & ~((size_t)(y) - 1))
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/* bitstr_t in bit string containing the bit. */
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static inline size_t
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_bit_idx(size_t _bit)
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{
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return (_bit / _BITSTR_BITS);
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}
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/* bit number within bitstr_t at _bit_idx(_bit). */
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static inline size_t
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_bit_offset(size_t _bit)
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{
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return (_bit % _BITSTR_BITS);
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}
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/* Mask for the bit within its long. */
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static inline bitstr_t
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_bit_mask(size_t _bit)
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{
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return (1UL << _bit_offset(_bit));
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}
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static inline bitstr_t
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_bit_make_mask(size_t _start, size_t _stop)
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{
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return ((_BITSTR_MASK << _bit_offset(_start)) &
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(_BITSTR_MASK >> (_BITSTR_BITS - _bit_offset(_stop) - 1)));
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}
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/*----------------------------- Public Interface -----------------------------*/
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/* Number of bytes allocated for a bit string of nbits bits */
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#define bitstr_size(_nbits) (_bit_roundup2((_nbits), _BITSTR_BITS) / 8)
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/* Allocate a bit string initialized with no bits set. */
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#ifdef _KERNEL
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static inline bitstr_t *
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bit_alloc(size_t _nbits, struct malloc_type *type, int flags)
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{
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return ((bitstr_t *)malloc(bitstr_size(_nbits), type, flags | M_ZERO));
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}
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#else
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static inline bitstr_t *
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bit_alloc(size_t _nbits)
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{
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return ((bitstr_t *)calloc(bitstr_size(_nbits), 1));
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}
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#endif
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/* Allocate a bit string on the stack */
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#define bit_decl(name, nbits) \
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((name)[bitstr_size(nbits) / sizeof(bitstr_t)])
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/* Is bit N of bit string set? */
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static inline int
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bit_test(const bitstr_t *_bitstr, size_t _bit)
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{
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return ((_bitstr[_bit_idx(_bit)] & _bit_mask(_bit)) != 0);
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}
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/* Set bit N of bit string. */
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static inline void
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bit_set(bitstr_t *_bitstr, size_t _bit)
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{
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_bitstr[_bit_idx(_bit)] |= _bit_mask(_bit);
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}
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/* clear bit N of bit string name */
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static inline void
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bit_clear(bitstr_t *_bitstr, size_t _bit)
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{
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_bitstr[_bit_idx(_bit)] &= ~_bit_mask(_bit);
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}
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/* Are bits in [start ... stop] in bit string all 0 or all 1? */
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static inline int
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bit_ntest(const bitstr_t *_bitstr, size_t _start, size_t _stop, int _match)
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{
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const bitstr_t *_stopbitstr;
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bitstr_t _mask;
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_mask = (_match == 0) ? 0 : _BITSTR_MASK;
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_stopbitstr = _bitstr + _bit_idx(_stop);
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_bitstr += _bit_idx(_start);
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if (_bitstr == _stopbitstr)
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return (0 == ((*_bitstr ^ _mask) &
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_bit_make_mask(_start, _stop)));
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if (_bit_offset(_start) != 0 &&
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0 != ((*_bitstr++ ^ _mask) &
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_bit_make_mask(_start, _BITSTR_BITS - 1)))
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return (0);
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if (_bit_offset(_stop) == _BITSTR_BITS - 1)
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++_stopbitstr;
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while (_bitstr < _stopbitstr) {
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if (*_bitstr++ != _mask)
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return (0);
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}
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return (_bit_offset(_stop) == _BITSTR_BITS - 1 ||
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0 == ((*_stopbitstr ^ _mask) & _bit_make_mask(0, _stop)));
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}
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/* Set bits start ... stop inclusive in bit string. */
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static inline void
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bit_nset(bitstr_t *_bitstr, size_t _start, size_t _stop)
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{
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bitstr_t *_stopbitstr;
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_stopbitstr = _bitstr + _bit_idx(_stop);
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_bitstr += _bit_idx(_start);
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if (_bitstr == _stopbitstr) {
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*_bitstr |= _bit_make_mask(_start, _stop);
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} else {
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if (_bit_offset(_start) != 0)
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*_bitstr++ |= _bit_make_mask(_start, _BITSTR_BITS - 1);
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if (_bit_offset(_stop) == _BITSTR_BITS - 1)
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++_stopbitstr;
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while (_bitstr < _stopbitstr)
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*_bitstr++ = _BITSTR_MASK;
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if (_bit_offset(_stop) != _BITSTR_BITS - 1)
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*_stopbitstr |= _bit_make_mask(0, _stop);
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}
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}
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/* Clear bits start ... stop inclusive in bit string. */
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static inline void
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bit_nclear(bitstr_t *_bitstr, size_t _start, size_t _stop)
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{
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bitstr_t *_stopbitstr;
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_stopbitstr = _bitstr + _bit_idx(_stop);
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_bitstr += _bit_idx(_start);
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if (_bitstr == _stopbitstr) {
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*_bitstr &= ~_bit_make_mask(_start, _stop);
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} else {
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if (_bit_offset(_start) != 0)
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*_bitstr++ &= ~_bit_make_mask(_start, _BITSTR_BITS - 1);
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if (_bit_offset(_stop) == _BITSTR_BITS - 1)
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++_stopbitstr;
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while (_bitstr < _stopbitstr)
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*_bitstr++ = 0;
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if (_bit_offset(_stop) != _BITSTR_BITS - 1)
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*_stopbitstr &= ~_bit_make_mask(0, _stop);
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}
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}
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/* Find the first '_match'-bit in bit string at or after bit start. */
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static inline ssize_t
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bit_ff_at_(bitstr_t *_bitstr, size_t _start, size_t _nbits, int _match)
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{
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bitstr_t *_curbitstr;
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bitstr_t *_stopbitstr;
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bitstr_t _mask;
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bitstr_t _test;
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ssize_t _value;
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if (_start >= _nbits || _nbits <= 0)
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return (-1);
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_curbitstr = _bitstr + _bit_idx(_start);
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_stopbitstr = _bitstr + _bit_idx(_nbits - 1);
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_mask = _match ? 0 : _BITSTR_MASK;
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_test = _mask ^ *_curbitstr;
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if (_bit_offset(_start) != 0)
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_test &= _bit_make_mask(_start, _BITSTR_BITS - 1);
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while (_test == 0 && _curbitstr < _stopbitstr)
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_test = _mask ^ *(++_curbitstr);
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_value = ((_curbitstr - _bitstr) * _BITSTR_BITS) + ffsl(_test) - 1;
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if (_test == 0 ||
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(_bit_offset(_nbits) != 0 && (size_t)_value >= _nbits))
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_value = -1;
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return (_value);
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}
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#define bit_ff_at(_bitstr, _start, _nbits, _match, _resultp) \
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*(_resultp) = bit_ff_at_((_bitstr), (_start), (_nbits), (_match))
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/* Find the first bit set in bit string at or after bit start. */
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#define bit_ffs_at(_bitstr, _start, _nbits, _resultp) \
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*(_resultp) = bit_ff_at_((_bitstr), (_start), (_nbits), 1)
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/* Find the first bit clear in bit string at or after bit start. */
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#define bit_ffc_at(_bitstr, _start, _nbits, _resultp) \
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*(_resultp) = bit_ff_at_((_bitstr), (_start), (_nbits), 0)
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/* Find the first bit set in bit string. */
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#define bit_ffs(_bitstr, _nbits, _resultp) \
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*(_resultp) = bit_ff_at_((_bitstr), 0, (_nbits), 1)
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/* Find the first bit clear in bit string. */
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#define bit_ffc(_bitstr, _nbits, _resultp) \
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*(_resultp) = bit_ff_at_((_bitstr), 0, (_nbits), 0)
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/* Find contiguous sequence of at least size '_match'-bits at or after start */
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static inline ssize_t
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bit_ff_area_at_(bitstr_t *_bitstr, size_t _start, size_t _nbits, size_t _size,
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int _match)
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{
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bitstr_t *_curbitstr, _mask, _test;
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size_t _last, _shft, _maxshft;
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ssize_t _value;
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if (_start + _size > _nbits || _nbits <= 0)
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return (-1);
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_mask = _match ? _BITSTR_MASK : 0;
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_maxshft = _bit_idx(_size - 1) == 0 ? _size : (int)_BITSTR_BITS;
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_value = _start;
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_curbitstr = _bitstr + _bit_idx(_start);
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_test = ~(_BITSTR_MASK << _bit_offset(_start));
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for (_last = _size - 1, _test |= _mask ^ *_curbitstr;
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!(_bit_idx(_last) == 0 &&
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(_test & _bit_make_mask(0, _last)) == 0);
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_last -= _BITSTR_BITS, _test = _mask ^ *++_curbitstr) {
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if (_test == 0)
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continue;
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/* Shrink-left every 0-area in _test by maxshft-1 bits. */
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for (_shft = _maxshft; _shft > 1 && (_test & (_test + 1)) != 0;
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_shft = (_shft + 1) / 2)
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_test |= _test >> _shft / 2;
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/* Find the start of the first 0-area in _test. */
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_last = ffsl(~(_test >> 1));
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_value = (_curbitstr - _bitstr) * _BITSTR_BITS + _last;
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/* If there's insufficient space left, give up. */
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if (_value + _size > _nbits) {
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_value = -1;
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break;
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}
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_last += _size - 1;
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/* If a solution is contained in _test, success! */
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if (_bit_idx(_last) == 0)
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break;
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/* A solution here needs bits from the next word. */
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}
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return (_value);
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}
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#define bit_ff_area_at(_bitstr, _start, _nbits, _size, _match, _resultp) \
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*(_resultp) = bit_ff_area_at_(_bitstr, _start, _nbits, _size, _match);
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/* Find contiguous sequence of at least size set bits at or after start */
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#define bit_ffs_area_at(_bitstr, _start, _nbits, _size, _resultp) \
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*(_resultp) = bit_ff_area_at_((_bitstr), (_start), (_nbits), (_size), 1)
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/* Find contiguous sequence of at least size cleared bits at or after start */
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#define bit_ffc_area_at(_bitstr, _start, _nbits, _size, _resultp) \
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*(_resultp) = bit_ff_area_at_((_bitstr), (_start), (_nbits), (_size), 0)
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/* Find contiguous sequence of at least size set bits in bit string */
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#define bit_ffs_area(_bitstr, _nbits, _size, _resultp) \
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*(_resultp) = bit_ff_area_at_((_bitstr), 0, (_nbits), (_size), 1)
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/* Find contiguous sequence of at least size cleared bits in bit string */
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#define bit_ffc_area(_bitstr, _nbits, _size, _resultp) \
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*(_resultp) = bit_ff_area_at_((_bitstr), 0, (_nbits), (_size), 0)
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/* Count the number of bits set in a bitstr of size _nbits at or after _start */
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static inline ssize_t
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bit_count_(bitstr_t *_bitstr, size_t _start, size_t _nbits)
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{
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bitstr_t *_curbitstr, mask;
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size_t curbitstr_len;
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ssize_t _value = 0;
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if (_start >= _nbits)
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return (0);
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_curbitstr = _bitstr + _bit_idx(_start);
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_nbits -= _BITSTR_BITS * _bit_idx(_start);
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_start -= _BITSTR_BITS * _bit_idx(_start);
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if (_start > 0) {
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curbitstr_len = (int)_BITSTR_BITS < _nbits ?
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(int)_BITSTR_BITS : _nbits;
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mask = _bit_make_mask(_start, _bit_offset(curbitstr_len - 1));
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_value += __bitcountl(*_curbitstr & mask);
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_curbitstr++;
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if (_nbits < _BITSTR_BITS)
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return (_value);
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_nbits -= _BITSTR_BITS;
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}
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while (_nbits >= (int)_BITSTR_BITS) {
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_value += __bitcountl(*_curbitstr);
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_curbitstr++;
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_nbits -= _BITSTR_BITS;
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}
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if (_nbits > 0) {
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mask = _bit_make_mask(0, _bit_offset(_nbits - 1));
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_value += __bitcountl(*_curbitstr & mask);
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}
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return (_value);
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}
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#define bit_count(_bitstr, _start, _nbits, _resultp) \
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*(_resultp) = bit_count_((_bitstr), (_start), (_nbits))
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/* Traverse all set bits, assigning each location in turn to iter */
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#define bit_foreach_at(_bitstr, _start, _nbits, _iter) \
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for ((_iter) = bit_ff_at_((_bitstr), (_start), (_nbits), 1); \
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(_iter) != -1; \
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(_iter) = bit_ff_at_((_bitstr), (_iter) + 1, (_nbits), 1))
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#define bit_foreach(_bitstr, _nbits, _iter) \
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bit_foreach_at(_bitstr, /*start*/0, _nbits, _iter)
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/* Traverse all unset bits, assigning each location in turn to iter */
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#define bit_foreach_unset_at(_bitstr, _start, _nbits, _iter) \
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for ((_iter) = bit_ff_at_((_bitstr), (_start), (_nbits), 0); \
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(_iter) != -1; \
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(_iter) = bit_ff_at_((_bitstr), (_iter) + 1, (_nbits), 0))
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#define bit_foreach_unset(_bitstr, _nbits, _iter) \
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bit_foreach_unset_at(_bitstr, /*start*/0, _nbits, _iter)
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#endif /* _SYS_BITSTRING_H_ */ |