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-rw-r--r--util-linux/losetup.c59
1 files changed, 34 insertions, 25 deletions
diff --git a/util-linux/losetup.c b/util-linux/losetup.c
index e224a4d..e44773a 100644
--- a/util-linux/losetup.c
+++ b/util-linux/losetup.c
@@ -10,44 +10,48 @@
#include "libbb.h"
int losetup_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int losetup_main(int argc, char **argv)
+int losetup_main(int argc UNUSED_PARAM, char **argv)
{
- char dev[] = LOOP_NAME"0";
unsigned opt;
+ int n;
char *opt_o;
- char *s;
unsigned long long offset = 0;
+ enum {
+ OPT_d = (1 << 0),
+ OPT_o = (1 << 1),
+ OPT_f = (1 << 2),
+ };
/* 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
+ if (opt == OPT_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)
+ 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 (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 (argv[0]) {
+ char *s;
+
+ if (opt == OPT_f) /* -f should not have arguments */
+ bb_show_usage();
- if (argc == 1) {
- /* -o or no option */
+ if (argv[1]) {
+ /* [-o OFS] BLOCKDEV FILE */
+ if (set_loop(&argv[0], argv[1], offset) < 0)
+ bb_simple_perror_msg_and_die(argv[0]);
+ return EXIT_SUCCESS;
+ }
+ /* [-o OFS] BLOCKDEV */
s = query_loop(argv[0]);
if (!s)
bb_simple_perror_msg_and_die(argv[0]);
@@ -57,23 +61,28 @@ int losetup_main(int argc, char **argv)
return EXIT_SUCCESS;
}
- /* -o, -f or no option */
+ /* [-o OFS|-f] with no params */
+ n = 0;
while (1) {
+ char *s;
+ char dev[sizeof(LOOP_NAME) + sizeof(int)*3];
+
+ sprintf(dev, LOOP_NAME"%u", n);
s = query_loop(dev);
+ n++;
if (!s) {
- if (opt == 0x4) {
+ if (n > 9 && errno && errno != ENXIO)
+ return EXIT_SUCCESS;
+ if (opt == OPT_f) {
puts(dev);
return EXIT_SUCCESS;
}
} else {
- if (opt != 0x4)
+ if (opt != OPT_f)
printf("%s: %s\n", dev, s);
if (ENABLE_FEATURE_CLEAN_UP)
free(s);
}
-
- if (++dev[sizeof(dev) - 2] > '9')
- break;
}
return EXIT_SUCCESS;
}