diff options
| -rw-r--r-- | util-linux/losetup.c | 116 |
1 files changed, 65 insertions, 51 deletions
diff --git a/util-linux/losetup.c b/util-linux/losetup.c index 21108d0bf..c69763335 100644 --- a/util-linux/losetup.c +++ b/util-linux/losetup.c @@ -8,16 +8,16 @@ */ //usage:#define losetup_trivial_usage -//usage: "[-r] [-o OFS] LOOPDEV FILE - associate loop devices\n" +//usage: "[-r] [-o OFS] {-f|LOOPDEV} FILE - associate loop devices\n" //usage: " losetup -d LOOPDEV - disassociate\n" -//usage: " losetup [-f] - show" +//usage: " losetup -a - show status of all\n" +//usage: " losetup -f - show next available" //usage:#define losetup_full_usage "\n\n" //usage: " -o OFS Start OFS bytes into FILE" //usage: "\n -r Read-only" -//usage: "\n -f Show first free loop device" +//usage: "\n -f Show/find first free loop device" //usage: //usage:#define losetup_notes_usage -//usage: "No arguments will display all current associations.\n" //usage: "One argument (losetup /dev/loop1) will display the current association\n" //usage: "(if any), or disassociate it (with -d). The display shows the offset\n" //usage: "and filename of the file the loop device is currently bound to.\n\n" @@ -31,77 +31,91 @@ int losetup_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int losetup_main(int argc UNUSED_PARAM, char **argv) { unsigned opt; - int n; char *opt_o; - unsigned long long offset = 0; + char dev[LOOP_NAMESIZE]; enum { OPT_d = (1 << 0), OPT_o = (1 << 1), OPT_f = (1 << 2), - OPT_r = (1 << 3), /* must be last */ + OPT_a = (1 << 3), + OPT_r = (1 << 4), /* must be last */ }; - /* max 2 args, -d,-o,-f opts are mutually exclusive */ - opt_complementary = "?2:d--of:o--df:f--do"; - opt = getopt32(argv, "do:fr", &opt_o); + opt_complementary = "?2:d--ofar:a--ofr"; + opt = getopt32(argv, "do:far", &opt_o); argv += optind; - if (opt == OPT_o) - offset = xatoull(opt_o); + /* LOOPDEV */ + if (!opt && argv[0] && !argv[1]) { + char *s; + 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; + } + + /* -d LOOPDEV */ if (opt == OPT_d) { - /* -d BLOCKDEV */ - if (!argv[0] || argv[1]) - bb_show_usage(); if (del_loop(argv[0])) bb_simple_perror_msg_and_die(argv[0]); return EXIT_SUCCESS; } - if (argv[0]) { - char *s; - - if (opt == OPT_f) /* -f should not have arguments */ - bb_show_usage(); + /* -a */ + if (opt == OPT_a) { + int n; + for (n = 0; n < 10; n++) { + char *s; - if (argv[1]) { - /* [-r] [-o OFS] BLOCKDEV FILE */ - if (set_loop(&argv[0], argv[1], offset, (opt / OPT_r)) < 0) - bb_simple_perror_msg_and_die(argv[0]); - return EXIT_SUCCESS; + sprintf(dev, LOOP_FORMAT, n); + s = query_loop(dev); + if (s) { + printf("%s: %s\n", dev, s); + if (ENABLE_FEATURE_CLEAN_UP) + free(s); + } } - /* [-r] [-o OFS] BLOCKDEV */ - 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; } - /* [-r] [-o OFS|-f] with no params */ - n = 0; - while (1) { + /* contains -f */ + if (opt & OPT_f) { char *s; - char dev[LOOP_NAMESIZE]; + int n = 0; - sprintf(dev, LOOP_FORMAT, n); - s = query_loop(dev); - n++; - if (!s) { - if (n > 9 && errno && errno != ENXIO) - return EXIT_SUCCESS; - if (opt == OPT_f) { - puts(dev); - return EXIT_SUCCESS; - } - } else { - if (opt != OPT_f) - printf("%s: %s\n", dev, s); - if (ENABLE_FEATURE_CLEAN_UP) + do { + sprintf(dev, LOOP_FORMAT, n); + s = query_loop(dev); + if (s && ENABLE_FEATURE_CLEAN_UP) free(s); + } while (s); + if ((opt == OPT_f) && !argv[0]) { + puts(dev); + return EXIT_SUCCESS; } } - return EXIT_SUCCESS; + + /* [-r] [-o OFS] {-f|LOOPDEV} FILE */ + if (argv[0] && ((opt & OPT_f) || argv[1])) { + unsigned long long offset = 0; + char *d = dev; + + if (opt == OPT_o) + offset = xatoull(opt_o); + if (opt != OPT_f) + d = *(argv++); + + if (argv[0]) { + if (set_loop(&d, argv[0], offset, (opt / OPT_r)) < 0) + bb_simple_perror_msg_and_die(argv[0]); + return EXIT_SUCCESS; + } + } + + bb_show_usage(); + return EXIT_FAILURE; } |