Back to index

glibc  2.9
inet_mkadr.c
Go to the documentation of this file.
00001 /*
00002  * Copyright (c) 1983, 1993
00003  *     The Regents of the University of California.  All rights reserved.
00004  *
00005  * Redistribution and use in source and binary forms, with or without
00006  * modification, are permitted provided that the following conditions
00007  * are met:
00008  * 1. Redistributions of source code must retain the above copyright
00009  *    notice, this list of conditions and the following disclaimer.
00010  * 2. Redistributions in binary form must reproduce the above copyright
00011  *    notice, this list of conditions and the following disclaimer in the
00012  *    documentation and/or other materials provided with the distribution.
00013  * 4. Neither the name of the University nor the names of its contributors
00014  *    may be used to endorse or promote products derived from this software
00015  *    without specific prior written permission.
00016  *
00017  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
00018  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00019  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00020  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
00021  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00022  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
00023  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
00024  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
00025  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
00026  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00027  * SUCH DAMAGE.
00028  */
00029 
00030 #if defined(LIBC_SCCS) && !defined(lint)
00031 static char sccsid[] = "@(#)inet_makeaddr.c      8.1 (Berkeley) 6/4/93";
00032 #endif /* LIBC_SCCS and not lint */
00033 
00034 #include <sys/param.h>
00035 #include <netinet/in.h>
00036 #include <arpa/inet.h>
00037 
00038 /*
00039  * Formulate an Internet address from network + host.  Used in
00040  * building addresses stored in the ifnet structure.
00041  */
00042 struct in_addr
00043 inet_makeaddr(net, host)
00044        in_addr_t net, host;
00045 {
00046        struct in_addr in;
00047 
00048        if (net < 128)
00049               in.s_addr = (net << IN_CLASSA_NSHIFT) | (host & IN_CLASSA_HOST);
00050        else if (net < 65536)
00051               in.s_addr = (net << IN_CLASSB_NSHIFT) | (host & IN_CLASSB_HOST);
00052        else if (net < 16777216L)
00053               in.s_addr = (net << IN_CLASSC_NSHIFT) | (host & IN_CLASSC_HOST);
00054        else
00055               in.s_addr = net | host;
00056        in.s_addr = htonl(in.s_addr);
00057        return in;
00058 }
00059 libc_hidden_def (inet_makeaddr)