mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-22 11:17:19 +00:00
94 lines
3.3 KiB
Groff
94 lines
3.3 KiB
Groff
.\" Copyright (c) 1990, 1991, 1993, 1994
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
.\"
|
|
.\" This code is derived from software contributed to Berkeley by
|
|
.\" the American National Standards Committee X3, on Information
|
|
.\" Processing Systems.
|
|
.\"
|
|
.\" 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.
|
|
.\"
|
|
.\" @(#)bsearch.3 8.3 (Berkeley) 4/19/94
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd April 19, 1994
|
|
.Dt BSEARCH 3
|
|
.Os
|
|
.Sh NAME
|
|
.Nm bsearch
|
|
.Nd binary search of a sorted table
|
|
.Sh LIBRARY
|
|
.Lb libc
|
|
.Sh SYNOPSIS
|
|
.In stdlib.h
|
|
.Ft void *
|
|
.Fn bsearch "const void *key" "const void *base" "size_t nmemb" "size_t size" "int (*compar) (const void *, const void *)"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Fn bsearch
|
|
function searches an array of
|
|
.Fa nmemb
|
|
objects, the initial member of which is
|
|
pointed to by
|
|
.Fa base ,
|
|
for a member that matches the object pointed to by
|
|
.Fa key .
|
|
The size of each member of the array is specified by
|
|
.Fa size .
|
|
.Pp
|
|
The contents of the array should be in ascending sorted order according
|
|
to the comparison function referenced by
|
|
.Fa compar .
|
|
The
|
|
.Fa compar
|
|
routine
|
|
is expected to have
|
|
two arguments which point to the
|
|
.Fa key
|
|
object and to an array member, in that order, and should return an integer
|
|
less than, equal to, or greater than zero if the
|
|
.Fa key
|
|
object is found, respectively, to be less than, to match, or be
|
|
greater than the array member.
|
|
.Sh RETURN VALUES
|
|
The
|
|
.Fn bsearch
|
|
function returns a pointer to a matching member of the array, or a null
|
|
pointer if no match is found.
|
|
If two members compare as equal, which member is matched is unspecified.
|
|
.Sh SEE ALSO
|
|
.Xr db 3 ,
|
|
.Xr lsearch 3 ,
|
|
.Xr qsort 3
|
|
.\" .Xr tsearch 3
|
|
.Sh STANDARDS
|
|
The
|
|
.Fn bsearch
|
|
function conforms to
|
|
.St -isoC .
|