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80 lines
1.6 KiB
C
80 lines
1.6 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini losetup implementation for busybox
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*
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* Copyright (C) 2002 Matt Kraai.
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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#include "libbb.h"
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int losetup_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int losetup_main(int argc, char **argv)
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{
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char dev[] = LOOP_NAME"0";
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unsigned opt;
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char *opt_o;
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char *s;
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unsigned long long offset = 0;
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/* max 2 args, all opts are mutually exclusive */
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opt_complementary = "?2:d--of:o--df:f-do";
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opt = getopt32(argv, "do:f", &opt_o);
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argc -= optind;
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argv += optind;
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if (opt == 0x2) // -o
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offset = xatoull(opt_o);
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if (opt == 0x4 && argc) // -f does not take any argument
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bb_show_usage();
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if (opt == 0x1) { // -d
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/* detach takes exactly one argument */
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if (argc != 1)
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bb_show_usage();
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if (del_loop(argv[0]))
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bb_simple_perror_msg_and_die(argv[0]);
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return EXIT_SUCCESS;
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}
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if (argc == 2) {
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/* -o or no option */
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if (set_loop(&argv[0], argv[1], offset) < 0)
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bb_simple_perror_msg_and_die(argv[0]);
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return EXIT_SUCCESS;
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}
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if (argc == 1) {
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/* -o or no option */
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s = query_loop(argv[0]);
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if (!s)
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bb_simple_perror_msg_and_die(argv[0]);
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printf("%s: %s\n", argv[0], s);
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if (ENABLE_FEATURE_CLEAN_UP)
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free(s);
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return EXIT_SUCCESS;
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}
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/* -o, -f or no option */
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while (1) {
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s = query_loop(dev);
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if (!s) {
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if (opt == 0x4) {
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puts(dev);
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return EXIT_SUCCESS;
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}
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} else {
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if (opt != 0x4)
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printf("%s: %s\n", dev, s);
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if (ENABLE_FEATURE_CLEAN_UP)
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free(s);
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}
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if (++dev[sizeof(dev) - 2] > '9')
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break;
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}
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return EXIT_SUCCESS;
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}
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