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freebsd-skq/share/man/man3/bitstring.3
Benedict Reuschling 55ed6718c2 Fix various, mostly minor errors in man pages like: 
- Abbreviated month name in .Dd
- position of HISTORY section
- alphabetical ordering within SEE ALSO section
- adding .Ed before .Sh DESCRIPTION
- remove trailing whitespaces
- Line break after a sentence stop
- Use BSD OS macros instead of hardcoded strings

No .Dd bumps as there was no actual content change made
in any of these pages.

Submitted by:	Gordon Bergling gbergling_gmail.com
Approved by:	bcr
Differential Revision:	https://reviews.freebsd.org/D24591
2020-05-03 10:15:58 +00:00

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.\" 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.
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.\" 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.
.\"
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" 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.
.\"
.\" Copyright (c) 2014,2016 Spectra Logic Corporation
.\" All rights reserved.
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.\" 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,
.\" without modification.
.\" 2. Redistributions in binary form must reproduce at minimum a disclaimer
.\" substantially similar to the "NO WARRANTY" disclaimer below
.\" ("Disclaimer") and any redistribution must be conditioned upon
.\" including a substantially similar Disclaimer requirement for further
.\" binary redistribution.
.\"
.\" NO WARRANTY
.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
.\" "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
.\" LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
.\" A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
.\" HOLDERS OR CONTRIBUTORS BE LIABLE FOR 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)
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.\"
.\" @(#)bitstring.3 8.1 (Berkeley) 7/19/93
.\" $FreeBSD$
.\"
.Dd November 18, 2019
.Dt BITSTRING 3
.Os
.Sh NAME
.Nm bit_alloc ,
.Nm bit_clear ,
.Nm bit_count ,
.Nm bit_decl ,
.Nm bit_ffc ,
.Nm bit_ffs ,
.Nm bit_ffc_at ,
.Nm bit_ffs_at ,
.Nm bit_ffc_area ,
.Nm bit_ffs_area ,
.Nm bit_ffc_area_at ,
.Nm bit_ffs_area_at ,
.Nm bit_nclear ,
.Nm bit_nset ,
.Nm bit_set ,
.Nm bit_test ,
.Nm bitstr_size
.Nd bit-string manipulation functions and macros
.Sh SYNOPSIS
.In bitstring.h
.Ft bitstr_t *
.Fn bit_alloc "int nbits"
.Ft void
.Fn bit_decl "bitstr_t *name" "int nbits"
.Ft void
.Fn bit_clear "bitstr_t *name" "int bit"
.Ft void
.Fn bit_count "bitstr_t *name" "int count" "int nbits" "int *value"
.Ft void
.Fn bit_ffc "bitstr_t *name" "int nbits" "int *value"
.Ft void
.Fn bit_ffs "bitstr_t *name" "int nbits" "int *value"
.Ft void
.Fn bit_ffc_at "bitstr_t *name" "int start" "int nbits" "int *value"
.Ft void
.Fn bit_ffs_at "bitstr_t *name" "int start" "int nbits" "int *value"
.Ft void
.Fn bit_ffc_area "bitstr_t *name" "int nbits" "int size" "int *value"
.Ft void
.Fn bit_ffs_area "bitstr_t *name" "int nbits" "int size" "int *value"
.Ft void
.Fn bit_ffc_area_at "bitstr_t *name" "int start" "int nbits" "int size" "int *value"
.Ft void
.Fn bit_ffs_area_at "bitstr_t *name" "int start" "int nbits" "int size" "int *value"
.Ft void
.Fn bit_nclear "bitstr_t *name" "int start" "int stop"
.Ft void
.Fn bit_nset "bitstr_t *name" "int start" "int stop"
.Ft void
.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 function
.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.
If successful, the returned bit string is initialized with all bits cleared.
.Pp
The macro
.Fn bit_decl
declares a bit string with sufficient space to store
.Fa nbits
bits.
.Fn bit_decl
may be used to include statically sized bit strings in structure
definitions or to create bit strings on the stack.
Users of this macro are responsible for initialization of the bit string,
typically via a global initialization of the containing struct or use of the
.Fn bit_nset
or
.Fn bin_nclear
functions.
.Pp
The macro
.Fn bitstr_size
returns the number of bytes necessary to store
.Fa nbits
bits.
This is useful for copying bit strings.
.Pp
The functions
.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
functions
set or clear the zero-based numbered bits from
.Fa start
through
.Fa stop
in the bit string
.Ar name .
.Pp
The
.Fn bit_test
function
evaluates to non-zero if the zero-based numbered bit
.Fa bit
of bit string
.Fa name
is set, and zero otherwise.
.Pp
The function
.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
.Fn bit_ffs
function
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 function
.Fn bit_ffc_at
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 ,
at or after the zero-based bit index
.Fa start .
If all bits at or after
.Fa start
are set, the location referenced by
.Fa value
is set to \-1.
.Pp
The
.Fn bit_ffs_at
function
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 ,
at or after the zero-based bit index
.Fa start .
If no bits are set after
.Fa start ,
the location referenced by
.Fa value
is set to \-1.
.Pp
The
.Fn bit_ffc_area
function stores in the location referenced by
.Fa value
the zero-based number of the first bit beginning a sequence of unset bits of
at least
.Fa size
unset bits in the array of
.Fa nbits
bits referenced by
.Fa name .
If no sequence of contiguous unset bits of the specified
.Fa size
can be found, the location referenced by
.Fa value
is set to \-1.
.Pp
The
.Fn bit_ffs_area
function stores in the location referenced by
.Fa value
the zero-based number of the first bit beginning a sequence of set bits of
at least
.Fa size
set bits in the array of
.Fa nbits
bits referenced by
.Fa name .
If no sequence of contiguous set bits of the specified
.Fa size
can be found, the location referenced by
.Fa value
is set to \-1.
.Pp
The
.Fn bit_ffc_area_at
function stores in the location referenced by
.Fa value
the zero-based number of the first bit beginning a sequence of unset bits of
at least
.Fa size
unset bits in the array of
.Fa nbits
bits referenced by
.Fa name ,
at or after the zero-based bit index
.Fa start .
If no sequence of contiguous unset bits of the specified
.Fa size
can be found at or after
.Fa start ,
the location referenced by
.Fa value
is set to \-1.
.Pp
The
.Fn bit_ffs_area_at
function stores in the location referenced by
.Fa value
the zero-based number of the first bit beginning a sequence of set bits of
at least
.Fa size
set bits in the array of
.Fa nbits
bits referenced by
.Fa name ,
at or after the zero-based bit index
.Fa start .
If no sequence of contiguous set bits of the specified
.Fa size
can be found at or after
.Fa start ,
the location referenced by
.Fa value
is set to \-1.
.Pp
The
.Fn bit_count
function stores in the location referenced by
.Fa value
the number of bits set in the array of
.Fa nbits
bits referenced by
.Fa name ,
at or after the zero-based bit index
.Fa start .
.Pp
The arguments in bit string macros are evaluated only once and may safely
have side effects.
.Sh EXAMPLES
.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 ,
.Xr bitset 9
.Sh HISTORY
The
.Nm bitstring
functions first appeared in
.Bx 4.4 .
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