util-linux/losetup.c

/*
 * Mini losetup implementation for busybox
 *
 * Copyright (C) 2002  Matt Kraai.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 */

#include <getopt.h>
#include <stdlib.h>

#include "busybox.h"

int losetup_main (int argc, char **argv)
{
  int offset = 0;

  /* This will need a "while(getopt()!=-1)" loop when we can have more than
     one option, but for now we can't. */
  switch(getopt(argc,argv, "do:")) {
    case 'd':
      /* detach takes exactly one argument */
      if(optind+1!=argc) bb_show_usage();
      if(!del_loop(argv[optind])) return EXIT_SUCCESS;
die_failed:
      bb_perror_msg_and_die("%s",argv[optind]);

    case 'o':
      offset = bb_xparse_number (optarg, NULL);
      /* Fall through to do the losetup */
    case -1:
      /* losetup takes two argument:, loop_device and file */
      if(optind+2==argc) {
        if(set_loop(&argv[optind], argv[optind + 1], offset)>=0)
          return EXIT_SUCCESS;
        else goto die_failed;
      }
      if(optind+1==argc) {
        char *s=query_loop(argv[optind]);
        if (!s) goto die_failed;
        printf("%s: %s\n",argv[optind],s);
        if(ENABLE_FEATURE_CLEAN_UP) free(s);
        return EXIT_SUCCESS;
      }
      break;
  }
  bb_show_usage();
  return EXIT_FAILURE;
}