/usr/include/bsd/sys/bitstring.h is in libbsd-dev 0.8.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 | /*-
* 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.
* 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.
*
* $FreeBSD$
*/
#ifndef _SYS_BITSTRING_H_
#define _SYS_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) + 7) >> 3)
/* allocate a bitstring */
#define bit_alloc(nbits) \
(bitstr_t *)calloc((size_t)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) do { \
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); \
} \
} while (0)
/* set bits start ... stop in bitstring */
#define bit_nset(name, start, stop) do { \
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)); \
} \
} while (0)
/* find first bit clear in name */
#define bit_ffc(name, nbits, value) do { \
register bitstr_t *_name = (name); \
register int _byte, _nbits = (nbits); \
register int _stopbyte = _bit_byte(_nbits - 1), _value = -1; \
if (_nbits > 0) \
for (_byte = 0; _byte <= _stopbyte; ++_byte) \
if (_name[_byte] != 0xff) { \
bitstr_t _lb; \
_value = _byte << 3; \
for (_lb = _name[_byte]; (_lb&0x1); \
++_value, _lb >>= 1); \
break; \
} \
if (_value >= nbits) \
_value = -1; \
*(value) = _value; \
} while (0)
/* find first bit set in name */
#define bit_ffs(name, nbits, value) do { \
register bitstr_t *_name = (name); \
register int _byte, _nbits = (nbits); \
register int _stopbyte = _bit_byte(_nbits - 1), _value = -1; \
if (_nbits > 0) \
for (_byte = 0; _byte <= _stopbyte; ++_byte) \
if (_name[_byte]) { \
bitstr_t _lb; \
_value = _byte << 3; \
for (_lb = _name[_byte]; !(_lb&0x1); \
++_value, _lb >>= 1); \
break; \
} \
if (_value >= nbits) \
_value = -1; \
*(value) = _value; \
} while (0)
#endif /* !_SYS_BITSTRING_H_ */
|