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+.\" $Id: bitncmp.mdoc,v 1.3 2004/03/09 06:30:07 marka Exp $
+.\"
+.\" Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
+.\" Copyright (c) 1996,1999 by Internet Software Consortium.
+.\"
+.\" Permission to use, copy, modify, and distribute this software for any
+.\" purpose with or without fee is hereby granted, provided that the above
+.\" copyright notice and this permission notice appear in all copies.
+.\"
+.\" THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
+.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+.\" MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
+.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
+.\" OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+.\"
+.Dd June 1, 1996
+.Dt BITNCMP 3
+.Os BSD 4
+.Sh NAME
+.Nm bitncmp 
+.Nd compare bit masks
+.Sh SYNOPSIS
+.Ft int
+.Fn bitncmp "const void *l" "const void *r" "int n"
+.Sh DESCRIPTION
+The function
+.Fn bitncmp
+compares the
+.Dq Fa n
+most-significant bits of the two masks pointed to by
+.Dq Fa l
+and
+.Dq Fa r ,
+and returns an integer less than, equal to, or greater than 0, according to
+whether or not
+.Dq Fa l
+is lexicographically less than, equal to, or greater than
+.Dq Fa r
+when taken to be unsigned characters (this behaviour is just like that of
+.Xr memcmp 3 ) .
+.Pp
+.Sy NOTE :
+.Fn Bitncmp 
+assumes 
+.Sy network byte order ;
+this means that the fourth octet of 
+.Li 192.5.5.240/28 
+.Li 0x11110000 .
+.Sh RETURN VALUES
+.Fn Bitncmp
+returns values in the manner of
+.Xr memcmp 3 :
+.Bd -ragged -offset indent
++1 if 
+.Dq Fa 1
+is greater than 
+.Dq Fa r ;
+.Pp
+-1 if 
+.Dq Fa l
+is less than 
+.Dq Fa r ; 
+and
+.Pp
+0 if 
+.Dq Fa l
+is equal to
+.Dq Fa r ,
+.Ed
+.Pp
+where 
+.Dq Fa l
+and 
+.Dq Fa r
+are both interpreted as strings of unsigned characters (through bit 
+.Dq Fa n . )
+.Sh SEE ALSO
+.Xr memcmp 3 .
+.Sh AUTHOR
+Paul Vixie (ISC).