source: MondoRescue/branches/2.2.5/mindi-busybox/util-linux/losetup.c@ 1765

/* vi: set sw=4 ts=4: */
/*
 * Mini losetup implementation for busybox
 *
 * Copyright (C) 2002  Matt Kraai.
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */

#include <getopt.h>

#include "libbb.h"

int losetup_main(int argc, char **argv);
int losetup_main(int argc, char **argv)
{
    unsigned opt;
    char *opt_o;
    unsigned long long offset = 0;

    opt = getopt32(argv, "do:", &opt_o);
    argc -= optind;
    argv += optind;

    if (opt == 0x3) // -d + -o (illegal)
        bb_show_usage();

    if (opt == 0x1) { // -d
        /* detach takes exactly one argument */
        if (argc != 1)
            bb_show_usage();
        if (!del_loop(argv[0]))
            return EXIT_SUCCESS;
        bb_perror_nomsg_and_die();
    }

    if (opt == 0x2) // -o
        offset = xatoull(opt_o);

    /* -o or no option */

    if (argc == 2) {
        if (set_loop(&argv[0], argv[1], offset) < 0)
            bb_perror_nomsg_and_die();
    } else if (argc == 1) {
        char *s = query_loop(argv[0]);
        if (!s)
            bb_perror_nomsg_and_die();
        printf("%s: %s\n", argv[0], s);
        if (ENABLE_FEATURE_CLEAN_UP)
            free(s);
    } else {
        char dev[sizeof(LOOP_NAME"0")] = LOOP_NAME"0";
        char c;
        for (c = '0'; c <= '9'; ++c) {
            char *s;
            dev[sizeof(LOOP_NAME"0")-2] = c;
            s = query_loop(dev);
            if (s) {
                printf("%s: %s\n", dev, s);
                if (ENABLE_FEATURE_CLEAN_UP)
                    free(s);
            }
        }
    }
    return EXIT_SUCCESS;
}