Geeetech

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/**
 * \struct fpos_i3t
 * \brief internal type for istream
 * do not use in user apps
 */
struct fpos_i3t {
  /** stream position */
  uint32_t position;
  /** cluster for position */
  uint32_t cluster;
  fpos_i3t() : position(0), cluster(0) {}
};
  void getpos(fpos_i3t* pos);
  /** set position for streams
   * \param[out] pos struct with value for new position
   */
  void setpos(fpos_i3t* pos);

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void SdBaseFile::setpos(fpos_i3t* pos) {
  curPosition_ = pos->position;
  curCluster_ = pos->cluster;
}

//------------------------------------------------------------------------------
void SdBaseFile::getpos(fpos_i3t* pos) {
  pos->position = curPosition_;
  pos->cluster = curCluster_;
}
//------------------------------------------------------------------------------
/** Return the next available byte without consuming it.
 *
 * \return The byte if no error and not at eof else -1;
 */
int SdBaseFile::peek() {
  fpos_i3t pos;
  getpos(&pos);
  int c = read();
  if (c >= 0) setpos(&pos);
  return c;
}