add Berkeley specific header; lint cleanups

[unix-history] / usr / src / old / hostid / hostid.c

/*
* Copyright (c) 1983, 1988 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that this notice is preserved and that due credit is given
* to the University of California at Berkeley. The name of the University
* may not be used to endorse or promote products derived from this
* software without specific prior written permission. This software
* is provided ``as is'' without express or implied warranty.
*/

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1983, 1988 Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)hostid.c    5.5 (Berkeley) %G%";
#endif /* not lint */

#include <sys/types.h>
#include <stdio.h>
#include <netdb.h>

main(argc, argv)
       int argc;
       char **argv;
{
       register char *id;
       struct hostent *hp;
       u_long addr, inet_addr();
       long hostid, gethostid();
       char *index();

       if (argc < 2) {
               printf("%#lx\n", gethostid());
               exit(0);
       }

       id = argv[1];
       if (hp = gethostbyname(id)) {
               bcopy(hp->h_addr, &addr, sizeof(addr));
               hostid = addr;
       } else if (index(id, '.')) {
               if ((hostid = inet_addr(id)) == -1)
                       goto usage;
       } else {
               if (id[0] == '0' && (id[1] == 'x' || id[1] == 'X'))
                       id += 2;
               if (sscanf(id, "%lx", &hostid) != 1) {
usage:                  fputs("usage: hostid [hexnum or internet address]\n",
                           stderr);
                       exit(1);
               }
       }

       if (sethostid(hostid) < 0) {
               perror("sethostid");
               exit(1);
       }

       exit(0);
}