--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2020 Namjae Jeon <linkinjeon@kernel.org>
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <getopt.h>
+#include <errno.h>
+#include <locale.h>
+
+#include "exfat_ondisk.h"
+#include "libexfat.h"
+
+static void usage(void)
+{
+ fprintf(stderr, "Usage: exfatlabel\n");
+ fprintf(stderr, "\t-i | --volume-serial Switch to volume serial mode\n");
+ fprintf(stderr, "\t-V | --version Show version\n");
+ fprintf(stderr, "\t-h | --help Show help\n");
+
+ exit(EXIT_FAILURE);
+}
+
+static struct option opts[] = {
+ {"volume-serial", no_argument, NULL, 'i' },
+ {"version", no_argument, NULL, 'V' },
+ {"help", no_argument, NULL, 'h' },
+ {"?", no_argument, NULL, '?' },
+ {NULL, 0, NULL, 0 }
+};
+
+int main(int argc, char *argv[])
+{
+ int c;
+ int ret = EXIT_FAILURE;
+ struct exfat_blk_dev bd;
+ struct exfat_user_input ui;
+ bool version_only = false;
+ off_t root_clu_off;
+ int serial_mode = 0;
+ int flags = 0;
+
+ init_user_input(&ui);
+
+ if (!setlocale(LC_CTYPE, ""))
+ exfat_err("failed to init locale/codeset\n");
+
+ if (argc == 2)
+ flags = EXFAT_GET_VOLUME_LABEL;
+ else if (argc == 3)
+ flags = EXFAT_SET_VOLUME_LABEL;
+
+ opterr = 0;
+ while ((c = getopt_long(argc, argv, "iVh", opts, NULL)) != EOF)
+ switch (c) {
+ case 'i':
+ serial_mode = true;
+ if (argc == 3)
+ flags = EXFAT_GET_VOLUME_SERIAL;
+ else if (argc == 4)
+ flags = EXFAT_SET_VOLUME_SERIAL;
+
+ break;
+ case 'V':
+ version_only = true;
+ break;
+ case '?':
+ case 'h':
+ default:
+ usage();
+ }
+
+ show_version();
+ if (version_only)
+ exit(EXIT_FAILURE);
+
+ if (argc < 2)
+ usage();
+
+ memset(ui.dev_name, 0, sizeof(ui.dev_name));
+ snprintf(ui.dev_name, sizeof(ui.dev_name), "%s", argv[serial_mode + 1]);
+
+ ret = exfat_get_blk_dev_info(&ui, &bd);
+ if (ret < 0)
+ goto out;
+
+ if (serial_mode) {
+ /* Mode to change or display volume serial */
+ if (flags == EXFAT_GET_VOLUME_SERIAL) {
+ ret = exfat_show_volume_serial(&bd, &ui);
+ } else if (flags == EXFAT_SET_VOLUME_SERIAL) {
+ ui.volume_serial = strtoul(argv[3], NULL, 0);
+ ret = exfat_set_volume_serial(&bd, &ui);
+ }
+ } else {
+ /* Mode to change or display volume label */
+ root_clu_off = exfat_get_root_entry_offset(&bd);
+ if (root_clu_off < 0)
+ goto close_fd_out;
+
+ if (flags == EXFAT_GET_VOLUME_LABEL)
+ ret = exfat_show_volume_label(&bd, root_clu_off);
+ else if (flags == EXFAT_SET_VOLUME_LABEL)
+ ret = exfat_set_volume_label(&bd, argv[2], root_clu_off);
+ }
+
+close_fd_out:
+ close(bd.dev_fd);
+out:
+ return ret;
+}