[unix-history] / usr / src / lib / libc / net / inet_netof.c

/*	inet_netof.c	4.3	82/11/14	*/

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

/*
 * Return the network number from an internet
 * address; handles class a/b/c network #'s.
 */
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
056d5bbd	1	/* inet_netof.c 4.3 82/11/14 */
031f37dd SL	2
031f37dd SL	3	#include <sys/types.h>
056d5bbd	4	#include <netinet/in.h>
031f37dd SL	5
	6	/*
	7	* Return the network number from an internet
	8	* address; handles class a/b/c network #'s.
	9	*/
3a3b7ace	10	inet_netof(in)
031f37dd SL	11	struct in_addr in;
031f37dd SL	12	{
056d5bbd	13	register u_long i = ntohl(in.s_addr);
031f37dd	14
056d5bbd SL	15	if (IN_CLASSA(i))
	16	return (((i)&IN_CLASSA_NET) >> IN_CLASSA_NSHIFT);
	17	else if (IN_CLASSB(i))
	18	return (((i)&IN_CLASSB_NET) >> IN_CLASSB_NSHIFT);
	19	else
	20	return (((i)&IN_CLASSC_NET) >> IN_CLASSC_NSHIFT);
031f37dd	21	}