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;
+}