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-.\"	$NetBSD: bitstring.3,v 1.4 1994/11/30 15:24:31 jtc Exp $
-.\"
-.\" Copyright (c) 1989, 1991, 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.3	8.1 (Berkeley) 7/19/93
-.\"
-.Dd July 19, 1993
-.Dt BITSTRING 3
-.Os BSD 4
-.Sh NAME
-.Nm bit_alloc ,
-.Nm bit_clear ,
-.Nm bit_decl ,
-.Nm bit_ffs ,
-.Nm bit_nclear ,
-.Nm bit_nset,
-.Nm bit_set ,
-.Nm bitstr_size ,
-.Nm bit_test
-.Nd bit-string manipulation macros
-.Sh SYNOPSIS
-.Fd #include <bitstring.h>
-.Ft bitstr_t *
-.Fn bit_alloc "int nbits"
-.Fn bit_decl "bitstr_t *name" "int nbits"
-.Fn bit_clear "bitstr_t *name" "int bit"
-.Fn bit_ffc "bitstr_t *name" "int nbits" "int *value"
-.Fn bit_ffs "bitstr_t *name" "int nbits" "int *value"
-.Fn bit_nclear "bitstr_t *name" "int start" "int stop"
-.Fn bit_nset "bitstr_t *name" "int start" "int stop"
-.Fn bit_set "bitstr_t *name" "int bit"
-.Ft int
-.Fn bitstr_size "int nbits"
-.Ft int
-.Fn bit_test "bitstr_t *name" "int bit"
-.Sh DESCRIPTION
-These macros operate on strings of bits.
-.Pp
-The macro
-.Fn bit_alloc
-returns a pointer of type
-.Dq Fa "bitstr_t *"
-to sufficient space to store
-.Fa nbits
-bits, or
-.Dv NULL
-if no space is available.
-.Pp
-The macro
-.Fn bit_decl
-allocates sufficient space to store
-.Fa nbits
-bits on the stack.
-.Pp
-The macro
-.Fn bitstr_size
-returns the number of elements of type
-.Fa bitstr_t
-necessary to store
-.Fa nbits
-bits.
-This is useful for copying bit strings.
-.Pp
-The macros
-.Fn bit_clear
-and
-.Fn bit_set
-clear or set the zero-based numbered bit
-.Fa bit ,
-in the bit string
-.Ar name .
-.Pp
-The
-.Fn bit_nset
-and
-.Fn bit_nclear
-macros
-set or clear the zero-based numbered bits from
-.Fa start
-to
-.Fa stop
-in the bit string
-.Ar name .
-.Pp
-The
-.Fn bit_test
-macro
-evaluates to non-zero if the zero-based numbered bit
-.Fa bit
-of bit string
-.Fa name
-is set, and zero otherwise.
-.Pp
-The
-.Fn bit_ffs
-macro
-stores in the location referenced by
-.Fa value
-the zero-based number of the first bit set in the array of
-.Fa nbits
-bits referenced by
-.Fa name .
-If no bits are set, the location referenced by
-.Fa value
-is set to \-1.
-.Pp
-The macro
-.Fn bit_ffc
-stores in the location referenced by
-.Fa value
-the zero-based number of the first bit not set in the array of
-.Fa nbits
-bits referenced by
-.Fa name .
-If all bits are set, the location referenced by
-.Fa value
-is set to \-1.
-.Pp
-The macros
-.Fn bit_clear ,
-.Fn bit_set
-and
-.Fn bit_test
-will evaluate the
-.Fa bit
-argument more than once, so avoid using pre- or post-, increment or decrement.
-The arguments to the other macros are evaluated only once and may safely
-have side effects.
-.Sh EXAMPLE
-.Bd -literal -offset indent
-#include <limits.h>
-#include <bitstring.h>
-
-\&...
-#define	LPR_BUSY_BIT		0
-#define	LPR_FORMAT_BIT		1
-#define	LPR_DOWNLOAD_BIT	2
-\&...
-#define	LPR_AVAILABLE_BIT	9
-#define	LPR_MAX_BITS		10
-
-make_lpr_available()
-{
-	bitstr_t bit_decl(bitlist, LPR_MAX_BITS);
-	...
-	bit_nclear(bitlist, 0, LPR_MAX_BITS - 1);
-	...
-	if (!bit_test(bitlist, LPR_BUSY_BIT)) {
-		bit_clear(bitlist, LPR_FORMAT_BIT);
-		bit_clear(bitlist, LPR_DOWNLOAD_BIT);
-		bit_set(bitlist, LPR_AVAILABLE_BIT);
-	}
-}
-.Ed
-.Sh SEE ALSO
-.Xr malloc 3
-.Sh HISTORY
-The
-.Nm bitstring
-functions first appeared in 4.4BSD.