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/*
* Print an MBR disk signature for use in a Linux PARTUUID
*
* Copyright (C) 2020 Patrick McDermott
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <inttypes.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
static int
read_id(const char *dev)
{
FILE *fp;
uint8_t id[4];
if ((fp = fopen(dev, "r")) == NULL) {
perror("Failed to open device");
return 1;
}
if (fseek(fp, 440L, SEEK_SET) != 0) {
perror("Failed to seek on device");
fclose(fp);
return 1;
}
if (fread(id, sizeof(*id), sizeof(id) / sizeof(*id), fp) != 4) {
perror("Failed to read from device");
fclose(fp);
return 1;
}
printf("%02" PRIx8 "%02" PRIx8 "%02" PRIx8 "%02" PRIx8 "\n",
id[3], id[2], id[1], id[0]);
fclose(fp);
return 0;
}
int
main(int argc, char *argv[])
{
int errors = 0;
while (--argc) {
errors += read_id(*++argv);
}
return (errors > 0) ? EXIT_FAILURE : EXIT_SUCCESS;
}
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