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losetup: support -f (Loic Grenie <loic.grenie@gmail.com>)

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function                                             old     new   delta
losetup_main                                         238     278     +40
packed_usage                                       23021   23027      +6
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/0 up/down: 46/0)               Total: 46 bytes
This commit is contained in:
Denis Vlasenko
2007-09-26 17:54:18 +00:00
parent 137fbe495d
commit 7ae209c019
2 changed files with 45 additions and 29 deletions
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60
util-linux/losetup.c
View File

@@ -14,54 +14,68 @@
int losetup_main(int argc, char **argv);
int losetup_main(int argc, char **argv)
{
char dev[] = LOOP_NAME"0";
unsigned opt;
char *opt_o;
char *s;
unsigned long long offset = 0;
opt = getopt32(argv, "do:", &opt_o);
/* max 2 args, all opts are mutially exclusive */
opt_complementary = "?2:d--of:o--df:f-do";
opt = getopt32(argv, "do:f", &opt_o);
argc -= optind;
argv += optind;
if (opt == 0x3) // -d + -o (illegal)
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]))
return EXIT_SUCCESS;
bb_perror_nomsg_and_die();
if (del_loop(argv[0]))
bb_perror_nomsg_and_die();
return EXIT_SUCCESS;
}
if (opt == 0x2) // -o
offset = xatoull(opt_o);
/* -o or no option */
if (argc == 2) {
/* -o or no option */
if (set_loop(&argv[0], argv[1], offset) < 0)
bb_perror_nomsg_and_die();
} else if (argc == 1) {
char *s = query_loop(argv[0]);
return EXIT_SUCCESS;
}
if (argc == 1) {
/* -o or no option */
s = query_loop(argv[0]);
if (!s)
bb_perror_nomsg_and_die();
printf("%s: %s\n", argv[0], s);
if (ENABLE_FEATURE_CLEAN_UP)
free(s);
} else {
char dev[sizeof(LOOP_NAME"0")] = LOOP_NAME"0";
char c;
for (c = '0'; c <= '9'; ++c) {
char *s;
dev[sizeof(LOOP_NAME"0")-2] = c;
s = query_loop(dev);
if (s) {
printf("%s: %s\n", dev, 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) {
printf("%s\n", 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;
}