1.\" Copyright (c) 1989, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. Neither the name of the University nor the names of its contributors 13.\" may be used to endorse or promote products derived from this software 14.\" without specific prior written permission. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.\" from: @(#)lsearch.3 8.1 (Berkeley) 6/4/93 29.\" $NetBSD: lsearch.3,v 1.3 2005/07/12 08:28:42 wiz Exp $ 30.\" 31.Dd July 6, 2005 32.Dt LSEARCH 3 33.Os 34.Sh NAME 35.Nm lsearch , 36.Nm lfind 37.Nd linear searching routines 38.Sh LIBRARY 39.Lb libc 40.Sh SYNOPSIS 41.In search.h 42.Ft void * 43.Fn lsearch "const void *key" "void *base" "size_t *nelp" "size_t width" "int (*compar)(const void *, const void *)" 44.Ft void * 45.Fn lfind "const void *key" "const void *base" "size_t *nelp" "size_t width" "int (*compar)(const void *, const void *)" 46.Sh DESCRIPTION 47The functions 48.Fn lsearch , 49and 50.Fn lfind 51provide basic linear searching functionality. 52.Pp 53.Fa base 54is the pointer to the beginning of an array. 55The argument 56.Fa nelp 57is the current number of elements in the array, where each element 58is 59.Fa width 60bytes long. 61The 62.Fa compar 63argument points to a function which compares its two arguments and returns 64zero if they are matching, and non-zero otherwise. 65.Pp 66The 67.Fn lsearch 68and 69.Fn lfind 70functions 71return a pointer into the array referenced by 72.Fa base 73where 74.Fa key 75is located. 76If 77.Fa key 78does not exist, 79.Fn lfind 80will return a null pointer and 81.Fn lsearch 82will add it to the array. 83When an element is added to the array by 84.Fn lsearch 85the location referenced by the argument 86.Fa nelp 87is incremented by one. 88.Sh SEE ALSO 89.Xr bsearch 3 , 90.Xr db 3 91.Sh STANDARDS 92The 93.Fn lsearch 94and 95.Fn lfind 96functions conform to 97.St -p1003.1-2001 . 98