diff options
Diffstat (limited to 'util-linux/losetup.c')
-rw-r--r-- | util-linux/losetup.c | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/util-linux/losetup.c b/util-linux/losetup.c new file mode 100644 index 0000000..e224a4d --- /dev/null +++ b/util-linux/losetup.c @@ -0,0 +1,79 @@ +/* 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; +} |