time.hpp

/*
 * Copyright (c) 2014, Peter Thorson. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the WebSocket++ Project nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL PETER THORSON BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */
 
#ifndef WEBSOCKETPP_COMMON_TIME_HPP
#define WEBSOCKETPP_COMMON_TIME_HPP
 
#include <ctime>
 
namespace websocketpp {
namespace lib {
 
// Code in this header was inspired by the following article and includes some
// code from the related project g2log. The g2log code is public domain licensed
// http://kjellkod.wordpress.com/2013/01/22/exploring-c11-part-2-localtime-and-time-again/
 
/// Thread safe cross platform localtime
inline std::tm localtime(std::time_t const & time) {
    std::tm tm_snapshot;
#if (defined(__MINGW32__) || defined(__MINGW64__))
    memcpy(&tm_snapshot, ::localtime(&time), sizeof(std::tm));
#elif (defined(WIN32) || defined(_WIN32) || defined(__WIN32__))
    localtime_s(&tm_snapshot, &time);
#else
    localtime_r(&time, &tm_snapshot); // POSIX  
#endif
    return tm_snapshot;
}
 
} // lib
} // websocketpp
 
#endif // WEBSOCKETPP_COMMON_TIME_HPP