diff options
Diffstat (limited to 'third_party/abseil_cpp/absl/time/internal/cctz/src/time_zone_libc.cc')
| -rw-r--r-- | third_party/abseil_cpp/absl/time/internal/cctz/src/time_zone_libc.cc | 308 |
1 files changed, 0 insertions, 308 deletions
diff --git a/third_party/abseil_cpp/absl/time/internal/cctz/src/time_zone_libc.cc b/third_party/abseil_cpp/absl/time/internal/cctz/src/time_zone_libc.cc deleted file mode 100644 index 47cf84c663..0000000000 --- a/third_party/abseil_cpp/absl/time/internal/cctz/src/time_zone_libc.cc +++ /dev/null @@ -1,308 +0,0 @@ -// Copyright 2016 Google Inc. All Rights Reserved. -// -// 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 -// -// https://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. - -#if defined(_WIN32) || defined(_WIN64) -#define _CRT_SECURE_NO_WARNINGS 1 -#endif - -#include "time_zone_libc.h" - -#include <chrono> -#include <ctime> -#include <limits> -#include <utility> - -#include "absl/base/config.h" -#include "absl/time/internal/cctz/include/cctz/civil_time.h" -#include "absl/time/internal/cctz/include/cctz/time_zone.h" - -namespace absl { -ABSL_NAMESPACE_BEGIN -namespace time_internal { -namespace cctz { - -namespace { - -#if defined(_WIN32) || defined(_WIN64) -// Uses the globals: '_timezone', '_dstbias' and '_tzname'. -auto tm_gmtoff(const std::tm& tm) -> decltype(_timezone + _dstbias) { - const bool is_dst = tm.tm_isdst > 0; - return _timezone + (is_dst ? _dstbias : 0); -} -auto tm_zone(const std::tm& tm) -> decltype(_tzname[0]) { - const bool is_dst = tm.tm_isdst > 0; - return _tzname[is_dst]; -} -#elif defined(__sun) -// Uses the globals: 'timezone', 'altzone' and 'tzname'. -auto tm_gmtoff(const std::tm& tm) -> decltype(timezone) { - const bool is_dst = tm.tm_isdst > 0; - return is_dst ? altzone : timezone; -} -auto tm_zone(const std::tm& tm) -> decltype(tzname[0]) { - const bool is_dst = tm.tm_isdst > 0; - return tzname[is_dst]; -} -#elif defined(__native_client__) || defined(__myriad2__) || \ - defined(__EMSCRIPTEN__) -// Uses the globals: 'timezone' and 'tzname'. -auto tm_gmtoff(const std::tm& tm) -> decltype(_timezone + 0) { - const bool is_dst = tm.tm_isdst > 0; - return _timezone + (is_dst ? 60 * 60 : 0); -} -auto tm_zone(const std::tm& tm) -> decltype(tzname[0]) { - const bool is_dst = tm.tm_isdst > 0; - return tzname[is_dst]; -} -#else -// Adapt to different spellings of the struct std::tm extension fields. -#if defined(tm_gmtoff) -auto tm_gmtoff(const std::tm& tm) -> decltype(tm.tm_gmtoff) { - return tm.tm_gmtoff; -} -#elif defined(__tm_gmtoff) -auto tm_gmtoff(const std::tm& tm) -> decltype(tm.__tm_gmtoff) { - return tm.__tm_gmtoff; -} -#else -template <typename T> -auto tm_gmtoff(const T& tm) -> decltype(tm.tm_gmtoff) { - return tm.tm_gmtoff; -} -template <typename T> -auto tm_gmtoff(const T& tm) -> decltype(tm.__tm_gmtoff) { - return tm.__tm_gmtoff; -} -#endif // tm_gmtoff -#if defined(tm_zone) -auto tm_zone(const std::tm& tm) -> decltype(tm.tm_zone) { return tm.tm_zone; } -#elif defined(__tm_zone) -auto tm_zone(const std::tm& tm) -> decltype(tm.__tm_zone) { - return tm.__tm_zone; -} -#else -template <typename T> -auto tm_zone(const T& tm) -> decltype(tm.tm_zone) { - return tm.tm_zone; -} -template <typename T> -auto tm_zone(const T& tm) -> decltype(tm.__tm_zone) { - return tm.__tm_zone; -} -#endif // tm_zone -#endif - -inline std::tm* gm_time(const std::time_t* timep, std::tm* result) { -#if defined(_WIN32) || defined(_WIN64) - return gmtime_s(result, timep) ? nullptr : result; -#else - return gmtime_r(timep, result); -#endif -} - -inline std::tm* local_time(const std::time_t* timep, std::tm* result) { -#if defined(_WIN32) || defined(_WIN64) - return localtime_s(result, timep) ? nullptr : result; -#else - return localtime_r(timep, result); -#endif -} - -// Converts a civil second and "dst" flag into a time_t and UTC offset. -// Returns false if time_t cannot represent the requested civil second. -// Caller must have already checked that cs.year() will fit into a tm_year. -bool make_time(const civil_second& cs, int is_dst, std::time_t* t, int* off) { - std::tm tm; - tm.tm_year = static_cast<int>(cs.year() - year_t{1900}); - tm.tm_mon = cs.month() - 1; - tm.tm_mday = cs.day(); - tm.tm_hour = cs.hour(); - tm.tm_min = cs.minute(); - tm.tm_sec = cs.second(); - tm.tm_isdst = is_dst; - *t = std::mktime(&tm); - if (*t == std::time_t{-1}) { - std::tm tm2; - const std::tm* tmp = local_time(t, &tm2); - if (tmp == nullptr || tmp->tm_year != tm.tm_year || - tmp->tm_mon != tm.tm_mon || tmp->tm_mday != tm.tm_mday || - tmp->tm_hour != tm.tm_hour || tmp->tm_min != tm.tm_min || - tmp->tm_sec != tm.tm_sec) { - // A true error (not just one second before the epoch). - return false; - } - } - *off = static_cast<int>(tm_gmtoff(tm)); - return true; -} - -// Find the least time_t in [lo:hi] where local time matches offset, given: -// (1) lo doesn't match, (2) hi does, and (3) there is only one transition. -std::time_t find_trans(std::time_t lo, std::time_t hi, int offset) { - std::tm tm; - while (lo + 1 != hi) { - const std::time_t mid = lo + (hi - lo) / 2; - if (std::tm* tmp = local_time(&mid, &tm)) { - if (tm_gmtoff(*tmp) == offset) { - hi = mid; - } else { - lo = mid; - } - } else { - // If std::tm cannot hold some result we resort to a linear search, - // ignoring all failed conversions. Slow, but never really happens. - while (++lo != hi) { - if (std::tm* tmp = local_time(&lo, &tm)) { - if (tm_gmtoff(*tmp) == offset) break; - } - } - return lo; - } - } - return hi; -} - -} // namespace - -TimeZoneLibC::TimeZoneLibC(const std::string& name) - : local_(name == "localtime") {} - -time_zone::absolute_lookup TimeZoneLibC::BreakTime( - const time_point<seconds>& tp) const { - time_zone::absolute_lookup al; - al.offset = 0; - al.is_dst = false; - al.abbr = "-00"; - - const std::int_fast64_t s = ToUnixSeconds(tp); - - // If std::time_t cannot hold the input we saturate the output. - if (s < std::numeric_limits<std::time_t>::min()) { - al.cs = civil_second::min(); - return al; - } - if (s > std::numeric_limits<std::time_t>::max()) { - al.cs = civil_second::max(); - return al; - } - - const std::time_t t = static_cast<std::time_t>(s); - std::tm tm; - std::tm* tmp = local_ ? local_time(&t, &tm) : gm_time(&t, &tm); - - // If std::tm cannot hold the result we saturate the output. - if (tmp == nullptr) { - al.cs = (s < 0) ? civil_second::min() : civil_second::max(); - return al; - } - - const year_t year = tmp->tm_year + year_t{1900}; - al.cs = civil_second(year, tmp->tm_mon + 1, tmp->tm_mday, tmp->tm_hour, - tmp->tm_min, tmp->tm_sec); - al.offset = static_cast<int>(tm_gmtoff(*tmp)); - al.abbr = local_ ? tm_zone(*tmp) : "UTC"; // as expected by cctz - al.is_dst = tmp->tm_isdst > 0; - return al; -} - -time_zone::civil_lookup TimeZoneLibC::MakeTime(const civil_second& cs) const { - if (!local_) { - // If time_point<seconds> cannot hold the result we saturate. - static const civil_second min_tp_cs = - civil_second() + ToUnixSeconds(time_point<seconds>::min()); - static const civil_second max_tp_cs = - civil_second() + ToUnixSeconds(time_point<seconds>::max()); - const time_point<seconds> tp = - (cs < min_tp_cs) - ? time_point<seconds>::min() - : (cs > max_tp_cs) ? time_point<seconds>::max() - : FromUnixSeconds(cs - civil_second()); - return {time_zone::civil_lookup::UNIQUE, tp, tp, tp}; - } - - // If tm_year cannot hold the requested year we saturate the result. - if (cs.year() < 0) { - if (cs.year() < std::numeric_limits<int>::min() + year_t{1900}) { - const time_point<seconds> tp = time_point<seconds>::min(); - return {time_zone::civil_lookup::UNIQUE, tp, tp, tp}; - } - } else { - if (cs.year() - year_t{1900} > std::numeric_limits<int>::max()) { - const time_point<seconds> tp = time_point<seconds>::max(); - return {time_zone::civil_lookup::UNIQUE, tp, tp, tp}; - } - } - - // We probe with "is_dst" values of 0 and 1 to try to distinguish unique - // civil seconds from skipped or repeated ones. This is not always possible - // however, as the "dst" flag does not change over some offset transitions. - // We are also subject to the vagaries of mktime() implementations. - std::time_t t0, t1; - int offset0, offset1; - if (make_time(cs, 0, &t0, &offset0) && make_time(cs, 1, &t1, &offset1)) { - if (t0 == t1) { - // The civil time was singular (pre == trans == post). - const time_point<seconds> tp = FromUnixSeconds(t0); - return {time_zone::civil_lookup::UNIQUE, tp, tp, tp}; - } - - if (t0 > t1) { - std::swap(t0, t1); - std::swap(offset0, offset1); - } - const std::time_t tt = find_trans(t0, t1, offset1); - const time_point<seconds> trans = FromUnixSeconds(tt); - - if (offset0 < offset1) { - // The civil time did not exist (pre >= trans > post). - const time_point<seconds> pre = FromUnixSeconds(t1); - const time_point<seconds> post = FromUnixSeconds(t0); - return {time_zone::civil_lookup::SKIPPED, pre, trans, post}; - } - - // The civil time was ambiguous (pre < trans <= post). - const time_point<seconds> pre = FromUnixSeconds(t0); - const time_point<seconds> post = FromUnixSeconds(t1); - return {time_zone::civil_lookup::REPEATED, pre, trans, post}; - } - - // make_time() failed somehow so we saturate the result. - const time_point<seconds> tp = (cs < civil_second()) - ? time_point<seconds>::min() - : time_point<seconds>::max(); - return {time_zone::civil_lookup::UNIQUE, tp, tp, tp}; -} - -bool TimeZoneLibC::NextTransition(const time_point<seconds>&, - time_zone::civil_transition*) const { - return false; -} - -bool TimeZoneLibC::PrevTransition(const time_point<seconds>&, - time_zone::civil_transition*) const { - return false; -} - -std::string TimeZoneLibC::Version() const { - return std::string(); // unknown -} - -std::string TimeZoneLibC::Description() const { - return local_ ? "localtime" : "UTC"; -} - -} // namespace cctz -} // namespace time_internal -ABSL_NAMESPACE_END -} // namespace absl |