1.\" Copyright (c) 1990, 1991 The Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" This code is derived from software contributed to Berkeley by 5.\" Chris Torek. 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. All advertising materials mentioning features or use of this software 15.\" must display the following acknowledgement: 16.\" This product includes software developed by the University of 17.\" California, Berkeley and its contributors. 18.\" 4. Neither the name of the University nor the names of its contributors 19.\" may be used to endorse or promote products derived from this software 20.\" without specific prior written permission. 21.\" 22.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32.\" SUCH DAMAGE. 33.\" 34.\" @(#)bcmp.3 5.4 (Berkeley) 4/19/91 35.\" 36.Dd April 19, 1991 37.Dt BCMP 3 38.Os BSD 4.2 39.Sh NAME 40.Nm bcmp 41.Nd compare byte string 42.Sh SYNOPSIS 43.Fd #include <string.h> 44.Ft int 45.Fn bcmp "const void *b1" "const void *b2" "size_t len" 46.Sh DESCRIPTION 47The 48.Fn bcmp 49function 50compares byte string 51.Fa b1 52against byte string 53.Fa b2 , 54returning zero if they are identical, non-zero otherwise. 55Both strings are assumed to be 56.Fa len 57bytes long. 58Zero-length strings are always identical. 59.Pp 60The strings may overlap. 61.Sh SEE ALSO 62.Xr bcmp 3 , 63.Xr memcmp 3 , 64.Xr strcasecmp 3 , 65.Xr strcmp 3 , 66.Xr strcoll 3 , 67.Xr strxfrm 3 68.Sh HISTORY 69A 70.Fn bcmp 71function first appeared in 72.Bx 4.2 . 73