#include <sys/types.h>
#include <errno.h>
#include <stdio.h>
#include <dirent.h>

int main(int argc, char **argv)
{
  DIR *dir;
  struct dirent *ent;
  off_t offset = 0;
  
  if (argc < 2) return 1;
  dir = opendir(argv[1]);
  if (dir == NULL) { perror("opendir"); goto err; }
  while (1) {
    seekdir(dir, offset); /* Would be okay if "if(offset)..." is used */
    ent = readdir(dir);
    if (ent == NULL) break;
    offset = telldir(dir);
    printf("%08llx: %s\n", (unsigned long long) offset, ent->d_name);
  }
  return 0;
 err:
  return 1;
}