don't force extra keystroke after '=' operators

[unix-history] / usr / src / sbin / swapon / swapon.c

/*
* Copyright (c) 1980 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, 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'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1980 Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)swapon.c    5.3 (Berkeley) %G%";
#endif /* not lint */

#include <fstab.h>
#include <errno.h>
#include <stdio.h>

main(argc, argv)
       int argc;
       char **argv;
{
       extern char *optarg;
       extern int optind;
       register struct fstab *fsp;
       register int stat;
       int ch, doall;

       doall = 0;
       while ((ch = getopt(argc, argv, "a")) != EOF)
               switch((char)ch) {
               case 'a':
                       doall = 1;
                       break;
               case '?':
               default:
                       usage();
               }
       argv += optind;

       stat = 0;
       if (doall)
               while (fsp = getfsent()) {
                       if (strcmp(fsp->fs_type, FSTAB_SW))
                               continue;
                       if (add(fsp->fs_spec, 1))
                               stat = 1;
                       else
                               printf("swapon: adding %s as swap device\n",
                                   fsp->fs_spec);
               }
       else if (!*argv)
               usage();
       for (; *argv; ++argv)
               stat |= add(*argv, 0);
       exit(stat);
}

static
add(name, ignoreebusy)
       char *name;
       int ignoreebusy;
{
       extern int errno;

       if (swapon(name) == -1) {
               switch (errno) {
               case EINVAL:
                       fprintf(stderr, "swapon: %s: device not configured\n",
                           name);
                       break;
               case EBUSY:
                       if (!ignoreebusy)
                               fprintf(stderr,
                                   "swapon: %s: device already in use\n",
                                    name);
                       break;
               default:
                       fprintf(stderr, "swapon: %s: ", name);
                       perror((char *)NULL);
                       break;
               }
               return(1);
       }
       return(0);
}

static
usage()
{
       fprintf(stderr, "usage: swapon [-a] [special_file ...]\n");
       exit(1);
}