busybox/util-linux/losetup.c

/* 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;
}
1	/* vi: set sw=4 ts=4: */
2	/*
3	* Mini losetup implementation for busybox
4	*
5	* Copyright (C) 2002 Matt Kraai.
6	*
7	* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
8	*/
9
10	#include "libbb.h"
11
12	int losetup_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
13	int losetup_main(int argc, char **argv)
14	{
15	char dev[] = LOOP_NAME"0";
16	unsigned opt;
17	char *opt_o;
18	char *s;
19	unsigned long long offset = 0;
20
21	/* max 2 args, all opts are mutually exclusive */
22	opt_complementary = "?2:d--of:o--df:f-do";
23	opt = getopt32(argv, "do:f", &opt_o);
24	argc -= optind;
25	argv += optind;
26
27	if (opt == 0x2) // -o
28	offset = xatoull(opt_o);
29
30	if (opt == 0x4 && argc) // -f does not take any argument
31	bb_show_usage();
32
33	if (opt == 0x1) { // -d
34	/* detach takes exactly one argument */
35	if (argc != 1)
36	bb_show_usage();
37	if (del_loop(argv[0]))
38	bb_simple_perror_msg_and_die(argv[0]);
39	return EXIT_SUCCESS;
40	}
41
42	if (argc == 2) {
43	/* -o or no option */
44	if (set_loop(&argv[0], argv[1], offset) < 0)
45	bb_simple_perror_msg_and_die(argv[0]);
46	return EXIT_SUCCESS;
47	}
48
49	if (argc == 1) {
50	/* -o or no option */
51	s = query_loop(argv[0]);
52	if (!s)
53	bb_simple_perror_msg_and_die(argv[0]);
54	printf("%s: %s\n", argv[0], s);
55	if (ENABLE_FEATURE_CLEAN_UP)
56	free(s);
57	return EXIT_SUCCESS;
58	}
59
60	/* -o, -f or no option */
61	while (1) {
62	s = query_loop(dev);
63	if (!s) {
64	if (opt == 0x4) {
65	puts(dev);
66	return EXIT_SUCCESS;
67	}
68	} else {
69	if (opt != 0x4)
70	printf("%s: %s\n", dev, s);
71	if (ENABLE_FEATURE_CLEAN_UP)
72	free(s);
73	}
74
75	if (++dev[sizeof(dev) - 2] > '9')
76	break;
77	}
78	return EXIT_SUCCESS;
79	}