Function MakeFileName

src/leveldb/db/filename.cc:20–26

                             const std::string& fname);

static std::string MakeFileName(const std::string& dbname, uint64_t number,
                                const char* suffix) {
  char buf[100];
  snprintf(buf, sizeof(buf), "/%06llu.%s",
           static_cast<unsigned long long>(number), suffix);
  return dbname + buf;
}

std::string LogFileName(const std::string& dbname, uint64_t number) {
  assert(number > 0);