Function getFileAux

ext/src/llvm/MemoryBuffer.cpp:258–270

template <typename MB>
static ErrorOr<std::unique_ptr<MB>>
getFileAux(const Twine &Filename, int64_t FileSize, uint64_t MapSize,
           uint64_t Offset, bool RequiresNullTerminator, bool IsVolatile) {
  Expected<sys::fs::file_t> FDOrErr =
      sys::fs::openNativeFileForRead(Filename, sys::fs::OF_None);
  if (!FDOrErr)
    return errorToErrorCode(FDOrErr.takeError());
  sys::fs::file_t FD = *FDOrErr;
  auto Ret = getOpenFileImpl<MB>(FD, Filename, FileSize, MapSize, Offset,
                                 RequiresNullTerminator, IsVolatile);
  sys::fs::closeFile(FD);
  return Ret;
}

ErrorOr<std::unique_ptr<WritableMemoryBuffer>>
WritableMemoryBuffer::getFile(const Twine &Filename, int64_t FileSize,