gistfile1.cpp

  const std::string prefix(ZLOG_ENTRY_KEY_PREFIX);

  std::string start_after;
  while (true) {
    std::set<std::string> keys;
    ret = ioctx_->omap_get_keys(oid, start_after, 1, &keys);
    if (ret < 0) {
      return ret;
    }

    if (keys.empty()) {
      break;
    }

    start_after = *keys.rbegin();

    for (auto it = keys.begin(); it != keys.end();) {
      auto pos = it->find(prefix);
      if (pos == std::string::npos) {
        it = keys.erase(it);
        continue;
      }
      if (pos != 0) {
        std::cerr << "invalid" << std::endl;
        return -EIO;
      }
      auto spos = it->substr(prefix.length(), std::string::npos);
      uint64_t ipos;
      try {
        ipos = boost::lexical_cast<uint64_t>(spos);
      } catch (const boost::bad_lexical_cast& e) {
        return -EIO;
      }
      // normally we could skip, but trim_full should imply this property
      if (ipos > position) {
        return -EIO;
      }
      it++;
    }

    if (keys.empty()) {
      continue;
    }

    ret = ioctx_->omap_rm_keys(oid, keys);
    if (ret) {
      return ret;
    }
  }