Function EncodeChar

python-package/compile/src/lightgbm_R.cpp:38–47

using namespace LightGBM;

LGBM_SE EncodeChar(LGBM_SE dest, const char* src, LGBM_SE buf_len, LGBM_SE actual_len, size_t str_len) {
  if (str_len > INT32_MAX) {
    Log::Fatal("Don't support large string in R-package");
  }
  R_INT_PTR(actual_len)[0] = static_cast<int>(str_len);
  if (R_AS_INT(buf_len) < static_cast<int>(str_len)) { return dest; }
  auto ptr = R_CHAR_PTR(dest);
  std::memcpy(ptr, src, str_len);
  return dest;
}

LGBM_SE LGBM_GetLastError_R(LGBM_SE buf_len, LGBM_SE actual_len, LGBM_SE err_msg) {
  return EncodeChar(err_msg, LGBM_GetLastError(), buf_len, actual_len, std::strlen(LGBM_GetLastError()) + 1);