| /** |
| * 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_TIMEGM_HPP_ |
| #define QUICKSTEP_TYPES_PORT_TIMEGM_HPP_ |
| |
| #include <ctime> |
| |
| #include "types/port/TypesPortConfig.h" |
| #include "utility/Macros.hpp" |
| |
| namespace quickstep { |
| |
| #if defined(QUICKSTEP_HAVE_TIMEGM) |
| |
| /** |
| * @brief timegm implementation which uses system's timegm implementation. |
| * |
| * @param tm Broken-time struct. |
| * |
| * @return Seconds since epoch. |
| **/ |
| inline std::time_t timegmWithOriginal(struct tm *tm) { |
| return ::timegm(tm); |
| } |
| #endif // defined(QUICKSTEP_HAVE_TIMEGM) |
| |
| #if defined(QUICKSTEP_HAVE_SETENV) && defined(QUICKSTEP_HAVE_TZSET) |
| // This is statically initialized before main() in timegm.cpp |
| extern const bool kGMTSetup; |
| |
| /** |
| * @brief timegm implementation sets TZ to GMT and invokes std::mktime. |
| * |
| * @param tm Broken-time struct. |
| * |
| * @return Seconds since epoch. |
| **/ |
| inline std::time_t timegmWithTZGMT(struct tm *tm) { |
| // Reference kGMTSetup here so that any executable that links in timegm will |
| // call SetupGMT() before main(). |
| if (kGMTSetup) { |
| return std::mktime(tm); |
| } else { |
| FATAL_ERROR("SetupGMT() did not run at program startup."); |
| } |
| } |
| #endif // defined(QUICKSTEP_HAVE_SETENV) && defined(QUICKSTEP_HAVE_TZSET) |
| |
| // This is statically initialized before main() in timegm.cpp |
| extern const std::time_t kLocalTimeOffset; |
| |
| /** |
| * @brief timegm implementation which pre-computes the time zone offset and uses |
| * std::mktime. |
| * |
| * @param tm Broken-time struct. |
| * |
| * @return Seconds since epoch. |
| **/ |
| inline std::time_t timegmWithPrecomputedOffset(struct tm *tm) { |
| return std::mktime(tm) + kLocalTimeOffset; |
| } |
| |
| /** |
| * @brief Custom timegm implementation which avoids performance issues with |
| * system implementation. |
| * |
| * @param tm Broken-time struct. |
| * |
| * @return Seconds since epoch. |
| * |
| * @note This implementation does not correct values of broken-time values out |
| * of range, unlike the timegm() / mktime() implementation. Also, this |
| * implementation does not do any bounds checking, i.e., return -1 when |
| * the broken-time given can not be represented using std::time_t. |
| **/ |
| std::time_t timegmCustom(struct tm *tm); |
| |
| /** |
| * @brief System-based timegm implementation, i.e., uses some system implemented |
| * method to convert broken-time to seconds since epoch. |
| * |
| * @param tm Broken-time struct. |
| * |
| * @return Seconds since epoch. |
| **/ |
| inline std::time_t timegmSystemImplemented(struct tm *tm) { |
| #if defined(QUICKSTEP_HAVE_TIMEGM) |
| return timegmWithOriginal(tm); |
| #elif defined(QUICKSTEP_HAVE_SETENV) && defined(QUICKSTEP_HAVE_TZSET) |
| return timegmWithTZGMT(tm); |
| #else |
| return timegmWithPrecomputedOffset(tm); |
| #endif |
| } |
| |
| /** |
| * @brief Converts broken-time to seconds since epoch in GMT. |
| * |
| * @param tm Broken-time struct. |
| * |
| * @return Seconds since epoch. |
| **/ |
| inline std::time_t timegm(struct tm *tm) { |
| return timegmCustom(tm); |
| } |
| |
| } // namespace quickstep |
| |
| #endif // QUICKSTEP_TYPES_PORT_TIMEGM_HPP_ |