103 lines
3.4 KiB
Groff
103 lines
3.4 KiB
Groff
|
.\" Copyright (c) 1989, 1991, 1993
|
||
|
|
.\" The Regents of the University of California. All rights reserved.
|
||
|
|
.\"
|
||
|
|
.\" 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.
|
||
|
|
.\"
|
||
|
|
.\" @(#)lsearch.3 8.1 (Berkeley) 6/4/93
|
||
|
|
.\"
|
||
|
|
.Dd June 4, 1993
|
||
|
|
.Dt LSEARCH 3
|
||
|
|
.Os
|
||
|
|
.Sh NAME
|
||
|
|
.Nm lsearch ,
|
||
|
|
.Nm lfind,
|
||
|
|
.Nd linear searching routines
|
||
|
|
.Sh SYNOPSIS
|
||
|
|
.Ft char *
|
||
|
|
.Fn lsearch "const void *key" "const void *base" "size_t *nelp" "size_t width" "int (*compar)(void *, void *)"
|
||
|
|
.Ft char *
|
||
|
|
.Fn lfind "const void *key" "const void *base" "size_t *nelp" "size_t width" "int (*compar)(void *, void *)"
|
||
|
|
.Sh DESCRIPTION
|
||
|
|
.Bf -symbolic
|
||
|
|
This interface was obsolete before it was written.
|
||
|
|
It is available from the compatibility library, libcompat.
|
||
|
|
.Ef
|
||
|
|
.Pp
|
||
|
|
The functions
|
||
|
|
.Fn lsearch ,
|
||
|
|
and
|
||
|
|
.Fn lfind
|
||
|
|
provide basic linear searching functionality.
|
||
|
|
.Pp
|
||
|
|
.Fa Base
|
||
|
|
is the pointer to the beginning of an array.
|
||
|
|
The argument
|
||
|
|
.Fa nelp
|
||
|
|
is the current number of elements in the array, where each element
|
||
|
|
is
|
||
|
|
.Fa width
|
||
|
|
bytes long.
|
||
|
|
The
|
||
|
|
.Fa compar
|
||
|
|
function
|
||
|
|
is a comparison routine which is used to compare two elements.
|
||
|
|
It takes two arguments which point to the
|
||
|
|
.Fa key
|
||
|
|
object and to an array member, in that order, and must return an integer
|
||
|
|
less than, equivalent to, or greater than zero if the
|
||
|
|
.Fa key
|
||
|
|
object is considered, respectively, to be less than, equal to, or greater
|
||
|
|
than the array member.
|
||
|
|
.Pp
|
||
|
|
The
|
||
|
|
.Fn lsearch
|
||
|
|
and
|
||
|
|
.Fn lfind
|
||
|
|
functions
|
||
|
|
return a pointer into the array referenced by
|
||
|
|
.Fa base
|
||
|
|
where
|
||
|
|
.Fa key
|
||
|
|
is located.
|
||
|
|
If
|
||
|
|
.Fa key
|
||
|
|
does not exist,
|
||
|
|
.Fn lfind
|
||
|
|
will return a null pointer and
|
||
|
|
.Fn lsearch
|
||
|
|
will add it to the array.
|
||
|
|
When an element is added to the array by
|
||
|
|
.Fn lsearch
|
||
|
|
the location referenced by the argument
|
||
|
|
.Fa nelp
|
||
|
|
is incremented by one.
|
||
|
|
.Sh SEE ALSO
|
||
|
|
.Xr bsearch 3 ,
|
||
|
|
.Xr db 3
|