+++ /dev/null
-/*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
- *
- * @APPLE_LICENSE_HEADER_START@
- *
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License"). You may not use this file except in compliance with the
- * License. Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
- *
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
- * License for the specific language governing rights and limitations
- * under the License.
- *
- * @APPLE_LICENSE_HEADER_END@
- */
-/*
- * Copyright (c) 1989, 1993
- * The Regents of the University of California. All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Paul Vixie.
- *
- * 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.
- *
- * @(#)bitstring.h 8.1 (Berkeley) 7/19/93
- */
-
-#ifndef _BITSTRING_H_
-#define _BITSTRING_H_
-
-typedef unsigned char bitstr_t;
-
-/* internal macros */
- /* byte of the bitstring bit is in */
-#define _bit_byte(bit) \
- ((bit) >> 3)
-
- /* mask for the bit within its byte */
-#define _bit_mask(bit) \
- (1 << ((bit)&0x7))
-
-/* external macros */
- /* bytes in a bitstring of nbits bits */
-#define bitstr_size(nbits) \
- ((((nbits) - 1) >> 3) + 1)
-
- /* allocate a bitstring */
-#define bit_alloc(nbits) \
- (bitstr_t *)calloc(1, \
- (unsigned int)bitstr_size(nbits) * sizeof(bitstr_t))
-
- /* allocate a bitstring on the stack */
-#define bit_decl(name, nbits) \
- (name)[bitstr_size(nbits)]
-
- /* is bit N of bitstring name set? */
-#define bit_test(name, bit) \
- ((name)[_bit_byte(bit)] & _bit_mask(bit))
-
- /* set bit N of bitstring name */
-#define bit_set(name, bit) \
- (name)[_bit_byte(bit)] |= _bit_mask(bit)
-
- /* clear bit N of bitstring name */
-#define bit_clear(name, bit) \
- (name)[_bit_byte(bit)] &= ~_bit_mask(bit)
-
- /* clear bits start ... stop in bitstring */
-#define bit_nclear(name, start, stop) { \
- register bitstr_t *_name = name; \
- register int _start = start, _stop = stop; \
- register int _startbyte = _bit_byte(_start); \
- register int _stopbyte = _bit_byte(_stop); \
- if (_startbyte == _stopbyte) { \
- _name[_startbyte] &= ((0xff >> (8 - (_start&0x7))) | \
- (0xff << ((_stop&0x7) + 1))); \
- } else { \
- _name[_startbyte] &= 0xff >> (8 - (_start&0x7)); \
- while (++_startbyte < _stopbyte) \
- _name[_startbyte] = 0; \
- _name[_stopbyte] &= 0xff << ((_stop&0x7) + 1); \
- } \
-}
-
- /* set bits start ... stop in bitstring */
-#define bit_nset(name, start, stop) { \
- register bitstr_t *_name = name; \
- register int _start = start, _stop = stop; \
- register int _startbyte = _bit_byte(_start); \
- register int _stopbyte = _bit_byte(_stop); \
- if (_startbyte == _stopbyte) { \
- _name[_startbyte] |= ((0xff << (_start&0x7)) & \
- (0xff >> (7 - (_stop&0x7)))); \
- } else { \
- _name[_startbyte] |= 0xff << ((_start)&0x7); \
- while (++_startbyte < _stopbyte) \
- _name[_startbyte] = 0xff; \
- _name[_stopbyte] |= 0xff >> (7 - (_stop&0x7)); \
- } \
-}
-
- /* find first bit clear in name */
-#define bit_ffc(name, nbits, value) { \
- register bitstr_t *_name = name; \
- register int _byte, _nbits = nbits; \
- register int _stopbyte = _bit_byte(_nbits), _value = -1; \
- for (_byte = 0; _byte <= _stopbyte; ++_byte) \
- if (_name[_byte] != 0xff) { \
- _value = _byte << 3; \
- for (_stopbyte = _name[_byte]; (_stopbyte&0x1); \
- ++_value, _stopbyte >>= 1); \
- break; \
- } \
- *(value) = _value; \
-}
-
- /* find first bit set in name */
-#define bit_ffs(name, nbits, value) { \
- register bitstr_t *_name = name; \
- register int _byte, _nbits = nbits; \
- register int _stopbyte = _bit_byte(_nbits), _value = -1; \
- for (_byte = 0; _byte <= _stopbyte; ++_byte) \
- if (_name[_byte]) { \
- _value = _byte << 3; \
- for (_stopbyte = _name[_byte]; !(_stopbyte&0x1); \
- ++_value, _stopbyte >>= 1); \
- break; \
- } \
- *(value) = _value; \
-}
-
-#endif /* !_BITSTRING_H_ */
projects / apple / xnu.git / blobdiff