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/* 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 "libbb.h"
int losetup_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int losetup_main(int argc, char **argv)
{
char dev[] = LOOP_NAME"0";
unsigned opt;
char *opt_o;
char *s;
unsigned long long offset = 0;
/* max 2 args, all opts are mutually exclusive */
opt_complementary = "?2:d--of:o--df:f-do";
opt = getopt32(argv, "do:f", &opt_o);
argc -= optind;
argv += optind;
if (opt == 0x2) // -o
offset = xatoull(opt_o);
if (opt == 0x4 && argc) // -f does not take any argument
bb_show_usage();
if (opt == 0x1) { // -d
/* detach takes exactly one argument */
if (argc != 1)
bb_show_usage();
if (del_loop(argv[0]))
bb_simple_perror_msg_and_die(argv[0]);
return EXIT_SUCCESS;
}
if (argc == 2) {
/* -o or no option */
if (set_loop(&argv[0], argv[1], offset) < 0)
bb_simple_perror_msg_and_die(argv[0]);
return EXIT_SUCCESS;
}
if (argc == 1) {
/* -o or no option */
s = query_loop(argv[0]);
if (!s)
bb_simple_perror_msg_and_die(argv[0]);
printf("%s: %s\n", argv[0], s);
if (ENABLE_FEATURE_CLEAN_UP)
free(s);
return EXIT_SUCCESS;
}
/* -o, -f or no option */
while (1) {
s = query_loop(dev);
if (!s) {
if (opt == 0x4) {
puts(dev);
return EXIT_SUCCESS;
}
} else {
if (opt != 0x4)
printf("%s: %s\n", dev, s);
if (ENABLE_FEATURE_CLEAN_UP)
free(s);
}
if (++dev[sizeof(dev) - 2] > '9')
break;
}
return EXIT_SUCCESS;
}
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