inet_makeaddr.c

来自「操作系统SunOS 4.1.3版本的源码」· C语言 代码 · 共 27 行

#if !defined(lint) && defined(SCCSIDS)
static	char sccsid[] = "@(#)inet_makeaddr.c 1.1 92/07/30 SMI"; /* from UCB 4.4 85/06/02 */
#endif

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

/*
 * Formulate an Internet address from network + host.  Used in
 * building addresses stored in the ifnet structure.
 */
struct in_addr
inet_makeaddr(net, host)
	int net, host;
{
	u_long addr;

	if (net < 128)
		addr = (net << IN_CLASSA_NSHIFT) | (host & IN_CLASSA_HOST);
	else if (net < 65536)
		addr = (net << IN_CLASSB_NSHIFT) | (host & IN_CLASSB_HOST);
	else
		addr = (net << IN_CLASSC_NSHIFT) | (host & IN_CLASSC_HOST);
	addr = htonl(addr);
	return (*(struct in_addr *)&addr);
}