types/port/strnlen.hpp

/**
 *   Copyright 2011-2015 Quickstep Technologies LLC.
 *   Copyright 2015 Pivotal Software, Inc.
 *
 *   Licensed under the Apache License, Version 2.0 (the "License");
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 **/

#ifndef QUICKSTEP_TYPES_PORT_STRNLEN_HPP_
#define QUICKSTEP_TYPES_PORT_STRNLEN_HPP_

#include <cstddef>
#include <cstring>

#include "types/port/TypesPortConfig.h"

namespace quickstep {

/** \addtogroup Types
 *  @{
 */

#ifdef QUICKSTEP_HAVE_STRNLEN
inline std::size_t strnlen(const char *c, const std::size_t maxlen) {
  return ::strnlen(c, maxlen);
}
#else
inline std::size_t strnlen(const char *c, const std::size_t maxlen) {
  const char *loc = static_cast<const char*>(std::memchr(c, '\0', maxlen));
  if (loc == nullptr) {
    return maxlen;
  } else {
    return (loc - c);
  }
}
#endif

/** @} */

}  // namespace quickstep

#endif  // QUICKSTEP_TYPES_PORT_STRNLEN_HPP_