ce83c69e00
arguments; ensure that each is correct with respect to the implementation, rather than being correct as per english.
106 lines
3.5 KiB
Groff
106 lines
3.5 KiB
Groff
.\" Copyright (c) 1989, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" from: @(#)lsearch.3 8.1 (Berkeley) 6/4/93
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.\" $NetBSD: lsearch.3,v 1.5 1998/08/29 08:32:43 lukem Exp $
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.\"
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.Dd June 4, 1993
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.Dt LSEARCH 3
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.Os
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.Sh NAME
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.Nm lsearch ,
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.Nm lfind,
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.Nd linear searching routines
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.Sh LIBRARY
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.Lb libcompat
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.Sh SYNOPSIS
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.Ft char *
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.Fn lsearch "const void *key" "const void *base" "size_t *nelp" "size_t width" "int (*compar)(void *, void *)"
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.Ft char *
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.Fn lfind "const void *key" "const void *base" "size_t *nelp" "size_t width" "int (*compar)(void *, void *)"
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.Sh DESCRIPTION
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.Bf -symbolic
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These interfaces were obsolete before they were written.
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They are available from the compatibility library, libcompat.
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.Ef
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.Pp
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The functions
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.Fn lsearch ,
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and
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.Fn lfind
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provide basic linear searching functionality.
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.Pp
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.Fa base
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is the pointer to the beginning of an array.
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The argument
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.Fa nelp
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is the current number of elements in the array, where each element
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is
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.Fa width
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bytes long.
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The
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.Fa compar
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function
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is a comparison routine which is used to compare two elements.
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It takes two arguments which point to the
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.Fa key
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object and to an array member, in that order, and must return an integer
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less than, equivalent to, or greater than zero if the
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.Fa key
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object is considered, respectively, to be less than, equal to, or greater
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than the array member.
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.Pp
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The
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.Fn lsearch
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and
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.Fn lfind
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functions
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return a pointer into the array referenced by
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.Fa base
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where
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.Fa key
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is located.
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If
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.Fa key
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does not exist,
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.Fn lfind
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will return a null pointer and
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.Fn lsearch
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will add it to the array.
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When an element is added to the array by
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.Fn lsearch
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the location referenced by the argument
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.Fa nelp
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is incremented by one.
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.Sh SEE ALSO
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.Xr bsearch 3 ,
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.Xr db 3
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