#include <stdio.h>
#include <sys/statvfs.h>

#define PATH "/media/user/Samsung USB"

int main(int argc, const char *argv[]) {
  const unsigned int GB = (1024 * 1024) * 1024;
  struct statvfs buffer;
  int ret = statvfs(PATH, &buffer);

  if (!ret) {
    const double total = (double)(buffer.f_blocks * buffer.f_frsize) / GB;
    const double available = (double)(buffer.f_bfree * buffer.f_frsize) / GB;
    const double used = total - available;
    const double usedPercentage = (double)(used / total) * (double)100;
    printf("Total: %f --> %.0f\n", total, total);
    printf("Available: %f --> %.0f\n", available, available);
    printf("Used: %f --> %.1f\n", used, used);
    printf("Used Percentage: %f --> %.0f\n", usedPercentage, usedPercentage);
  }

  return ret;
}