text: /*
   * Copyright (C) 2004, 2005, 2008  Internet Systems Consortium, Inc. ("ISC")
   * Copyright (C) 1996, 1999, 2001  Internet Software Consortium.
   *
   * Permission to use, copy, modify, and/or 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.
   */
  
  #if defined(LIBC_SCCS) && !defined(lint)
  static const char rcsid[] = "$Id: bitncmp.c,v 1.5 2008/11/14 02:36:51 marka Exp $";
  #endif
  
  #include <port_before.h>
  
  #include <sys/types.h>
  
  #include <kits/support/String.h>
  
  #include <port_after.h>
  
  #include <isc/misc.h>
  
  /*%
   * int
   * bitncmp(l, r, n)
   *	compare bit masks l and r, for n bits.
   * return:
   *	-1, 1, or 0 in the libc tradition.
   * note:
   *	network byte order assumed.  this means 192.5.5.240/28 has
   *	0x11110000 in its fourth octet.
   * author:
   *	Paul Vixie (ISC), June 1996
   */
  int
  bitncmp(const void *l, const void *r, int n) {
  	u_int lb, rb;
  	int x, b;
  
  	b = n / 8;
  	x = memcmp(l, r, b);
  	if (x || (n % 8) == 0)
  		return (x);
  
  	lb = ((const u_char *)l)[b];
  	rb = ((const u_char *)r)[b];
  	for (b = n % 8; b > 0; b--) {
  		if ((lb & 0x80) != (rb & 0x80)) {
  			if (lb & 0x80)
  				return (1);
  			return (-1);
  		}
  		lb <<= 1;
  		rb <<= 1;
  	}
  	return (0);
  }
  
  /*! \file */
  