Program Listing for File streamports.cpp

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// ---------------------------------------------------------------------
// This file is part of falcon-core.
//
// Copyright (C) 2015, 2016, 2017 Neuro-Electronics Research Flanders
//
// Falcon-server is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Falcon-server is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with falcon-core. If not, see <http://www.gnu.org/licenses/>.
// ---------------------------------------------------------------------

#include "streamports.hpp"

int IdentifyNextSlot(int slot_request, int connected_slot_number,
                     bool allow_multi_connect, const PortPolicy &policy) {
  if (slot_request >= policy.max_slot_number()) {
    return -1;
  }

  // auto select first available slot
  if (slot_request < 0) {
    if (allow_multi_connect) {
      return connected_slot_number % policy.max_slot_number();
    } else if (connected_slot_number < policy.max_slot_number()) {
      return connected_slot_number;
    } else {
      return -1;
    }
  }

  // requested already connected slot
  if (slot_request < connected_slot_number) {
    if (allow_multi_connect) {
      return slot_request;
    } else {
      return -1;
    }
  }

  if (slot_request < policy.min_slot_number()) {
    return slot_request;
  }

  if (slot_request >= policy.min_slot_number() &&
      slot_request == connected_slot_number) {
    return slot_request;
  }

  return -1;
}