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1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Mini losetup implementation for busybox
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4 | *
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5 | * Copyright (C) 2002 Matt Kraai.
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6 | *
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7 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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8 | */
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9 |
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10 | #include <getopt.h>
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11 |
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12 | #include "libbb.h"
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13 |
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14 | int losetup_main(int argc, char **argv);
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15 | int losetup_main(int argc, char **argv)
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16 | {
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17 | unsigned opt;
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18 | char *opt_o;
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19 | unsigned long long offset = 0;
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20 |
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21 | opt = getopt32(argv, "do:", &opt_o);
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22 | argc -= optind;
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23 | argv += optind;
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24 |
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25 | if (opt == 0x3) // -d + -o (illegal)
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26 | bb_show_usage();
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27 |
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28 | if (opt == 0x1) { // -d
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29 | /* detach takes exactly one argument */
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30 | if (argc != 1)
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31 | bb_show_usage();
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32 | if (!del_loop(argv[0]))
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33 | return EXIT_SUCCESS;
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34 | bb_perror_nomsg_and_die();
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35 | }
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36 |
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37 | if (opt == 0x2) // -o
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38 | offset = xatoull(opt_o);
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39 |
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40 | /* -o or no option */
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41 |
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42 | if (argc == 2) {
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43 | if (set_loop(&argv[0], argv[1], offset) < 0)
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44 | bb_perror_nomsg_and_die();
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45 | } else if (argc == 1) {
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46 | char *s = query_loop(argv[0]);
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47 | if (!s)
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48 | bb_perror_nomsg_and_die();
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49 | printf("%s: %s\n", argv[0], s);
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50 | if (ENABLE_FEATURE_CLEAN_UP)
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51 | free(s);
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52 | } else {
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53 | char dev[sizeof(LOOP_NAME"0")] = LOOP_NAME"0";
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54 | char c;
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55 | for (c = '0'; c <= '9'; ++c) {
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56 | char *s;
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57 | dev[sizeof(LOOP_NAME"0")-2] = c;
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58 | s = query_loop(dev);
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59 | if (s) {
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60 | printf("%s: %s\n", dev, s);
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61 | if (ENABLE_FEATURE_CLEAN_UP)
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62 | free(s);
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63 | }
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64 | }
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65 | }
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66 | return EXIT_SUCCESS;
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67 | }
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