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/* $OpenBSD: bitstring.h,v 1.7 2024/08/26 11:52:54 bluhm Exp $ */
/* $NetBSD: bitstring.h,v 1.5 1997/05/14 15:49:55 pk Exp $ */
/*
* 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. 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_
/* modified for SV/AT and bitstring bugfix by M.R.Murphy, 11oct91
* bitstr_size changed gratuitously, but shorter
* bit_alloc spelling error fixed
* the following were efficient, but didn't work, they've been made to
* work, but are no longer as efficient :-)
* bit_nclear, bit_nset, bit_ffc, bit_ffs
*/
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) ({ \
register int __tbit = (bit); \
((name)[_bit_byte(__tbit)] & _bit_mask(__tbit)); \
})
/* set bit N of bitstring name */
#define bit_set(name, bit) do { \
register int __sbit = (bit); \
((name)[_bit_byte(__sbit)] |= _bit_mask(__sbit)); \
} while(0)
/* clear bit N of bitstring name */
#define bit_clear(name, bit) do { \
register int __cbit = (bit); \
((name)[_bit_byte(__cbit)] &= ~_bit_mask(__cbit)); \
} while(0)
/* clear bits start ... stop in bitstring */
#define bit_nclear(name, start, stop) do { \
register bitstr_t *__name = (name); \
register int __start = (start), __stop = (stop); \
while (__start <= __stop) { \
bit_clear(__name, __start); \
__start++; \
} \
} 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); \
while (__start <= __stop) { \
bit_set(__name, __start); \
__start++; \
} \
} while(0)
/* find first bit clear in name */
#define bit_ffc(name, nbits, value) do { \
register bitstr_t *__name = (name); \
register int __bit, __nbits = (nbits), __value = -1; \
for (__bit = 0; __bit < __nbits; ++__bit) \
if (!bit_test(__name, __bit)) { \
__value = __bit; \
break; \
} \
*(value) = __value; \
} while(0)
/* find first bit set in name */
#define bit_ffs(name, nbits, value) do { \
register bitstr_t *__name = (name); \
register int __bit, __nbits = (nbits), __value = -1; \
for (__bit = 0; __bit < __nbits; ++__bit) \
if (bit_test(__name, __bit)) { \
__value = __bit; \
break; \
} \
*(value) = __value; \
} while(0)
#endif /* !_BITSTRING_H_ */
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