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Annotation of XNU/bsd/include/bitstring.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*
        !            23:  * Copyright (c) 1989, 1993
        !            24:  *     The Regents of the University of California.  All rights reserved.
        !            25:  *
        !            26:  * This code is derived from software contributed to Berkeley by
        !            27:  * Paul Vixie.
        !            28:  *
        !            29:  * Redistribution and use in source and binary forms, with or without
        !            30:  * modification, are permitted provided that the following conditions
        !            31:  * are met:
        !            32:  * 1. Redistributions of source code must retain the above copyright
        !            33:  *    notice, this list of conditions and the following disclaimer.
        !            34:  * 2. Redistributions in binary form must reproduce the above copyright
        !            35:  *    notice, this list of conditions and the following disclaimer in the
        !            36:  *    documentation and/or other materials provided with the distribution.
        !            37:  * 3. All advertising materials mentioning features or use of this software
        !            38:  *    must display the following acknowledgement:
        !            39:  *     This product includes software developed by the University of
        !            40:  *     California, Berkeley and its contributors.
        !            41:  * 4. Neither the name of the University nor the names of its contributors
        !            42:  *    may be used to endorse or promote products derived from this software
        !            43:  *    without specific prior written permission.
        !            44:  *
        !            45:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            46:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            47:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            48:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            49:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            50:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            51:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            52:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            53:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            54:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            55:  * SUCH DAMAGE.
        !            56:  *
        !            57:  *     @(#)bitstring.h 8.1 (Berkeley) 7/19/93
        !            58:  */
        !            59: 
        !            60: #ifndef _BITSTRING_H_
        !            61: #define        _BITSTRING_H_
        !            62: 
        !            63: typedef        unsigned char bitstr_t;
        !            64: 
        !            65: /* internal macros */
        !            66:                                /* byte of the bitstring bit is in */
        !            67: #define        _bit_byte(bit) \
        !            68:        ((bit) >> 3)
        !            69: 
        !            70:                                /* mask for the bit within its byte */
        !            71: #define        _bit_mask(bit) \
        !            72:        (1 << ((bit)&0x7))
        !            73: 
        !            74: /* external macros */
        !            75:                                /* bytes in a bitstring of nbits bits */
        !            76: #define        bitstr_size(nbits) \
        !            77:        ((((nbits) - 1) >> 3) + 1)
        !            78: 
        !            79:                                /* allocate a bitstring */
        !            80: #define        bit_alloc(nbits) \
        !            81:        (bitstr_t *)calloc(1, \
        !            82:            (unsigned int)bitstr_size(nbits) * sizeof(bitstr_t))
        !            83: 
        !            84:                                /* allocate a bitstring on the stack */
        !            85: #define        bit_decl(name, nbits) \
        !            86:        (name)[bitstr_size(nbits)]
        !            87: 
        !            88:                                /* is bit N of bitstring name set? */
        !            89: #define        bit_test(name, bit) \
        !            90:        ((name)[_bit_byte(bit)] & _bit_mask(bit))
        !            91: 
        !            92:                                /* set bit N of bitstring name */
        !            93: #define        bit_set(name, bit) \
        !            94:        (name)[_bit_byte(bit)] |= _bit_mask(bit)
        !            95: 
        !            96:                                /* clear bit N of bitstring name */
        !            97: #define        bit_clear(name, bit) \
        !            98:        (name)[_bit_byte(bit)] &= ~_bit_mask(bit)
        !            99: 
        !           100:                                /* clear bits start ... stop in bitstring */
        !           101: #define        bit_nclear(name, start, stop) { \
        !           102:        register bitstr_t *_name = name; \
        !           103:        register int _start = start, _stop = stop; \
        !           104:        register int _startbyte = _bit_byte(_start); \
        !           105:        register int _stopbyte = _bit_byte(_stop); \
        !           106:        if (_startbyte == _stopbyte) { \
        !           107:                _name[_startbyte] &= ((0xff >> (8 - (_start&0x7))) | \
        !           108:                                      (0xff << ((_stop&0x7) + 1))); \
        !           109:        } else { \
        !           110:                _name[_startbyte] &= 0xff >> (8 - (_start&0x7)); \
        !           111:                while (++_startbyte < _stopbyte) \
        !           112:                        _name[_startbyte] = 0; \
        !           113:                _name[_stopbyte] &= 0xff << ((_stop&0x7) + 1); \
        !           114:        } \
        !           115: }
        !           116: 
        !           117:                                /* set bits start ... stop in bitstring */
        !           118: #define        bit_nset(name, start, stop) { \
        !           119:        register bitstr_t *_name = name; \
        !           120:        register int _start = start, _stop = stop; \
        !           121:        register int _startbyte = _bit_byte(_start); \
        !           122:        register int _stopbyte = _bit_byte(_stop); \
        !           123:        if (_startbyte == _stopbyte) { \
        !           124:                _name[_startbyte] |= ((0xff << (_start&0x7)) & \
        !           125:                                    (0xff >> (7 - (_stop&0x7)))); \
        !           126:        } else { \
        !           127:                _name[_startbyte] |= 0xff << ((_start)&0x7); \
        !           128:                while (++_startbyte < _stopbyte) \
        !           129:                        _name[_startbyte] = 0xff; \
        !           130:                _name[_stopbyte] |= 0xff >> (7 - (_stop&0x7)); \
        !           131:        } \
        !           132: }
        !           133: 
        !           134:                                /* find first bit clear in name */
        !           135: #define        bit_ffc(name, nbits, value) { \
        !           136:        register bitstr_t *_name = name; \
        !           137:        register int _byte, _nbits = nbits; \
        !           138:        register int _stopbyte = _bit_byte(_nbits), _value = -1; \
        !           139:        for (_byte = 0; _byte <= _stopbyte; ++_byte) \
        !           140:                if (_name[_byte] != 0xff) { \
        !           141:                        _value = _byte << 3; \
        !           142:                        for (_stopbyte = _name[_byte]; (_stopbyte&0x1); \
        !           143:                            ++_value, _stopbyte >>= 1); \
        !           144:                        break; \
        !           145:                } \
        !           146:        *(value) = _value; \
        !           147: }
        !           148: 
        !           149:                                /* find first bit set in name */
        !           150: #define        bit_ffs(name, nbits, value) { \
        !           151:        register bitstr_t *_name = name; \
        !           152:        register int _byte, _nbits = nbits; \
        !           153:        register int _stopbyte = _bit_byte(_nbits), _value = -1; \
        !           154:        for (_byte = 0; _byte <= _stopbyte; ++_byte) \
        !           155:                if (_name[_byte]) { \
        !           156:                        _value = _byte << 3; \
        !           157:                        for (_stopbyte = _name[_byte]; !(_stopbyte&0x1); \
        !           158:                            ++_value, _stopbyte >>= 1); \
        !           159:                        break; \
        !           160:                } \
        !           161:        *(value) = _value; \
        !           162: }
        !           163: 
        !           164: #endif /* !_BITSTRING_H_ */

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