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+.\"	$OpenBSD: memcmp.3,v 1.11 2024/12/11 23:28:20 jsg Exp $
+.\"
+.\" Copyright (c) 1990, 1991 The Regents of the University of California.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to Berkeley by
+.\" Chris Torek and 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. 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.
+.\"
+.Dd $Mdocdate: December 11 2024 $
+.Dt MEMCMP 3
+.Os
+.Sh NAME
+.Nm memcmp
+.Nd compare byte string
+.Sh SYNOPSIS
+.In string.h
+.Ft int
+.Fn memcmp "const void *b1" "const void *b2" "size_t len"
+.Sh DESCRIPTION
+The
+.Fn memcmp
+function compares byte string
+.Fa b1
+against byte string
+.Fa b2 .
+Both strings are assumed to be
+.Fa len
+bytes long.
+.Sh RETURN VALUES
+The
+.Fn memcmp
+function returns zero if the two strings are identical,
+otherwise returns the difference between the first two differing bytes
+(treated as
+.Vt unsigned char
+values, so that
+.Sq Li \e200
+is greater than
+.Sq Li \&\e0 ,
+for example).
+Zero-length strings are always identical.
+.Sh SEE ALSO
+.Xr bcmp 3 ,
+.Xr strcasecmp 3 ,
+.Xr strcmp 3 ,
+.Xr strcoll 3 ,
+.Xr strxfrm 3 ,
+.Xr timingsafe_memcmp 3 ,
+.Xr wmemcmp 3
+.Sh STANDARDS
+The
+.Fn memcmp
+function conforms to
+.St -ansiC .
+.Sh HISTORY
+The
+.Fn memcmp
+function first appeared in
+.At V
+and was reimplemented for
+.Bx 4.3 .