usr/src/lib/libc/net/inet_netof.c

/*
 * Copyright (c) 1983 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)inet_netof.c	5.5 (Berkeley) %G%";
#endif /* LIBC_SCCS and not lint */

#include <sys/types.h>
#include <netinet/in.h>

/*
 * Return the network number from an internet
 * address; handles class a/b/c network #'s.
 */
u_long
inet_netof(in)
	struct in_addr in;
{
	register u_long i = ntohl(in.s_addr);

	if (IN_CLASSA(i))
		return (((i)&IN_CLASSA_NET) >> IN_CLASSA_NSHIFT);
	else if (IN_CLASSB(i))
		return (((i)&IN_CLASSB_NET) >> IN_CLASSB_NSHIFT);
	else
		return (((i)&IN_CLASSC_NET) >> IN_CLASSC_NSHIFT);
}
Commit	Line	Data
	1	/*
	2	* Copyright (c) 1983 Regents of the University of California.
	3	* All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms are permitted
	6	* provided that the above copyright notice and this paragraph are
	7	* duplicated in all such forms and that any documentation,
	8	* advertising materials, and other materials related to such
	9	* distribution and use acknowledge that the software was developed
	10	* by the University of California, Berkeley. The name of the
	11	* University may not be used to endorse or promote products derived
	12	* from this software without specific prior written permission.
	13	* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
	14	* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
	15	* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
	16	*/
	17
	18	#if defined(LIBC_SCCS) && !defined(lint)
	19	static char sccsid[] = "@(#)inet_netof.c 5.5 (Berkeley) %G%";
	20	#endif /* LIBC_SCCS and not lint */
	21
	22	#include <sys/types.h>
	23	#include <netinet/in.h>
	24
	25	/*
	26	* Return the network number from an internet
	27	* address; handles class a/b/c network #'s.
	28	*/
	29	u_long
	30	inet_netof(in)
	31	struct in_addr in;
	32	{
	33	register u_long i = ntohl(in.s_addr);
	34
	35	if (IN_CLASSA(i))
	36	return (((i)&IN_CLASSA_NET) >> IN_CLASSA_NSHIFT);
	37	else if (IN_CLASSB(i))
	38	return (((i)&IN_CLASSB_NET) >> IN_CLASSB_NSHIFT);
	39	else
	40	return (((i)&IN_CLASSC_NET) >> IN_CLASSC_NSHIFT);
	41	}