.\" Copyright (c) 1990 The Regents of the University of California.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to Berkeley by
.\" Chris Torek.
.\"
.\" %sccs.include.redist.man%
.\"
.\"	@(#)memcmp.3	5.2 (Berkeley) 06/24/90
.\"
.TH MEMCMP 3 ""
.UC 7
.SH NAME
memcmp \- compare byte string
.SH SYNOPSIS
.nf
.ft B
#include <string.h>

int
memcmp(const void *b1, const void *b2, size_t len);
.ft R
.fi
.SH DESCRIPTION
.B Memcmp
compares byte string
.I b1
against byte string
.IR b2 ,
returning zero if they are identical,
otherwise returning the difference between the first two differing bytes
(treated as unsigned char values, so that '\e200' is greater than \&'\e0',
e.g.).
Both strings are assumed to be
.I len
bytes long.
Zero-length strings are always identical.
.SH SEE ALSO
bcmp(3), strcasecmp(3), strcmp(3), strcoll(3), strxfrm(3)
.SH STANDARDS
.I Memcmp
conforms to ANSI X3.159-1989 (``ANSI C'').