[apple/libc.git] / net / inet_netof-fbsd.c

/*
 * Copyright (c) 1983, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. 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.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)inet_netof.c	8.1 (Berkeley) 6/4/93";
#endif /* LIBC_SCCS and not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/lib/libc/net/inet_netof.c,v 1.5 2002/03/22 21:52:29 obrien Exp $");

#include <sys/param.h>
#include <netinet/in.h>
#include <arpa/inet.h>

/*
 * Return the network number from an internet
 * address; handles class a/b/c network #'s.
 */
in_addr_t
inet_netof(in)
	struct in_addr in;
{
	in_addr_t 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);
}

/*
 * Weak aliases for applications that use certain private entry points,
 * and fail to include <arpa/inet.h>.
 */
#undef inet_netof
__weak_reference(__inet_netof, inet_netof);
Commit	Line	Data
224c7076 A	1	/*
224c7076 A	2	* Copyright (c) 1983, 1993
e9ce8d39 A	3	* The Regents of the University of California. All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	* 3. All advertising materials mentioning features or use of this software
	14	* must display the following acknowledgement:
	15	* This product includes software developed by the University of
	16	* California, Berkeley and its contributors.
	17	* 4. Neither the name of the University nor the names of its contributors
	18	* may be used to endorse or promote products derived from this software
	19	* without specific prior written permission.
	20	*
	21	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	22	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	23	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	24	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	25	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	26	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	27	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	28	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	29	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	30	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	31	* SUCH DAMAGE.
	32	*/
	33
5b2abdfb	34	#if defined(LIBC_SCCS) && !defined(lint)
224c7076	35	static char sccsid[] = "@(#)inet_netof.c 8.1 (Berkeley) 6/4/93";
5b2abdfb	36	#endif /* LIBC_SCCS and not lint */
9385eb3d	37	#include <sys/cdefs.h>
224c7076	38	__FBSDID("$FreeBSD: src/lib/libc/net/inet_netof.c,v 1.5 2002/03/22 21:52:29 obrien Exp $");
e9ce8d39	39
224c7076 A	40	#include <sys/param.h>
	41	#include <netinet/in.h>
	42	#include <arpa/inet.h>
e9ce8d39 A	43
e9ce8d39 A	44	/*
224c7076 A	45	* Return the network number from an internet
224c7076 A	46	* address; handles class a/b/c network #'s.
e9ce8d39	47	*/
224c7076 A	48	in_addr_t
	49	inet_netof(in)
	50	struct in_addr in;
e9ce8d39	51	{
224c7076	52	in_addr_t i = ntohl(in.s_addr);
e9ce8d39	53
224c7076 A	54	if (IN_CLASSA(i))
	55	return (((i)&IN_CLASSA_NET) >> IN_CLASSA_NSHIFT);
	56	else if (IN_CLASSB(i))
	57	return (((i)&IN_CLASSB_NET) >> IN_CLASSB_NSHIFT);
	58	else
	59	return (((i)&IN_CLASSC_NET) >> IN_CLASSC_NSHIFT);
e9ce8d39	60	}
224c7076 A	61
	62	/*
	63	* Weak aliases for applications that use certain private entry points,
	64	* and fail to include <arpa/inet.h>.
	65	*/
	66	#undef inet_netof
	67	__weak_reference(__inet_netof, inet_netof);