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_makeaddr.c 5.4 (Berkeley) 11/17/88"; 20 #endif /* LIBC_SCCS and not lint */ 21 22 #include <sys/types.h> 23 #include <netinet/in.h> 24 25 /* 26 * Formulate an Internet address from network + host. Used in 27 * building addresses stored in the ifnet structure. 28 */ 29 struct in_addr 30 inet_makeaddr(net, host) 31 u_long net, host; 32 { 33 u_long addr; 34 35 if (net < 128) 36 addr = (net << IN_CLASSA_NSHIFT) | (host & IN_CLASSA_HOST); 37 else if (net < 65536) 38 addr = (net << IN_CLASSB_NSHIFT) | (host & IN_CLASSB_HOST); 39 else if (net < 16777216L) 40 addr = (net << IN_CLASSC_NSHIFT) | (host & IN_CLASSC_HOST); 41 else 42 addr = net | host; 43 addr = htonl(addr); 44 return (*(struct in_addr *)&addr); 45 } 46