fseek(fp, 0L, SEEK_END);
loc = ftell(fp) - 1; // -1 0x0A

printf("location: %ld\n", loc);

fseek(fp, 0L, SEEK_SET);
  for( ; loc>=0L; loc = loc - 2L){
    ch = fgetc(fp);
    putchar(ch);
    fseek(fp, sizeof(char), SEEK_CUR);
}