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Diffstat (limited to 'absl/time/internal/cctz/src/time_zone_libc.cc')
-rw-r--r--absl/time/internal/cctz/src/time_zone_libc.cc109
1 files changed, 63 insertions, 46 deletions
diff --git a/absl/time/internal/cctz/src/time_zone_libc.cc b/absl/time/internal/cctz/src/time_zone_libc.cc
index 3dd75b50..cfe7d55c 100644
--- a/absl/time/internal/cctz/src/time_zone_libc.cc
+++ b/absl/time/internal/cctz/src/time_zone_libc.cc
@@ -4,7 +4,7 @@
// 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
+// 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,
@@ -21,70 +21,87 @@
#include <chrono>
#include <ctime>
#include <limits>
-#include <tuple>
#include <utility>
#include "absl/time/internal/cctz/include/cctz/civil_time.h"
#include "absl/time/internal/cctz/include/cctz/time_zone.h"
namespace absl {
-inline namespace lts_2018_12_18 {
+inline namespace lts_2019_08_08 {
namespace time_internal {
namespace cctz {
namespace {
-// .first is seconds east of UTC; .second is the time-zone abbreviation.
-using OffsetAbbr = std::pair<int, const char*>;
-
-// Defines a function that can be called as follows:
-//
-// std::tm tm = ...;
-// OffsetAbbr off_abbr = get_offset_abbr(tm);
-//
#if defined(_WIN32) || defined(_WIN64)
// Uses the globals: '_timezone', '_dstbias' and '_tzname'.
-OffsetAbbr get_offset_abbr(const std::tm& tm) {
+auto tm_gmtoff(const std::tm& tm) -> decltype(_timezone + _dstbias) {
const bool is_dst = tm.tm_isdst > 0;
- const int off = _timezone + (is_dst ? _dstbias : 0);
- const char* abbr = _tzname[is_dst];
- return {off, abbr};
+ 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'.
-OffsetAbbr get_offset_abbr(const std::tm& tm) {
+auto tm_gmtoff(const std::tm& tm) -> decltype(timezone) {
const bool is_dst = tm.tm_isdst > 0;
- const int off = is_dst ? altzone : timezone;
- const char* abbr = tzname[is_dst];
- return {off, abbr};
+ 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'.
-OffsetAbbr get_offset_abbr(const std::tm& tm) {
+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;
- const int off = _timezone + (is_dst ? 60 * 60 : 0);
- const char* abbr = tzname[is_dst];
- return {off, abbr};
+ 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
-//
-// Returns an OffsetAbbr using std::tm fields with various spellings.
-//
-#if !defined(tm_gmtoff) && !defined(tm_zone)
template <typename T>
-OffsetAbbr get_offset_abbr(const T& tm, decltype(&T::tm_gmtoff) = nullptr,
- decltype(&T::tm_zone) = nullptr) {
- return {tm.tm_gmtoff, tm.tm_zone};
+auto tm_zone(const T& tm) -> decltype(tm.tm_zone) {
+ return tm.tm_zone;
}
-#endif // !defined(tm_gmtoff) && !defined(tm_zone)
-#if !defined(__tm_gmtoff) && !defined(__tm_zone)
template <typename T>
-OffsetAbbr get_offset_abbr(const T& tm, decltype(&T::__tm_gmtoff) = nullptr,
- decltype(&T::__tm_zone) = nullptr) {
- return {tm.__tm_gmtoff, tm.__tm_zone};
+auto tm_zone(const T& tm) -> decltype(tm.__tm_zone) {
+ return tm.__tm_zone;
}
-#endif // !defined(__tm_gmtoff) && !defined(__tm_zone)
+#endif // tm_zone
#endif
inline std::tm* gm_time(const std::time_t *timep, std::tm *result) {
@@ -127,7 +144,7 @@ bool make_time(const civil_second& cs, int is_dst, std::time_t* t, int* off) {
return false;
}
}
- *off = get_offset_abbr(tm).first;
+ *off = static_cast<int>(tm_gmtoff(tm));
return true;
}
@@ -138,7 +155,7 @@ std::time_t find_trans(std::time_t lo, std::time_t hi, int offset) {
while (lo + 1 != hi) {
const std::time_t mid = lo + (hi - lo) / 2;
if (std::tm* tmp = local_time(&mid, &tm)) {
- if (get_offset_abbr(*tmp).first == offset) {
+ if (tm_gmtoff(*tmp) == offset) {
hi = mid;
} else {
lo = mid;
@@ -148,7 +165,7 @@ std::time_t find_trans(std::time_t lo, std::time_t hi, int offset) {
// ignoring all failed conversions. Slow, but never really happens.
while (++lo != hi) {
if (std::tm* tmp = local_time(&lo, &tm)) {
- if (get_offset_abbr(*tmp).first == offset) break;
+ if (tm_gmtoff(*tmp) == offset) break;
}
}
return lo;
@@ -194,8 +211,8 @@ time_zone::absolute_lookup TimeZoneLibC::BreakTime(
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);
- std::tie(al.offset, al.abbr) = get_offset_abbr(*tmp);
- if (!local_) al.abbr = "UTC"; // as expected by cctz
+ 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;
}
@@ -268,13 +285,13 @@ time_zone::civil_lookup TimeZoneLibC::MakeTime(const civil_second& cs) const {
return {time_zone::civil_lookup::UNIQUE, tp, tp, tp};
}
-bool TimeZoneLibC::NextTransition(const time_point<seconds>& tp,
- time_zone::civil_transition* trans) const {
+bool TimeZoneLibC::NextTransition(const time_point<seconds>&,
+ time_zone::civil_transition*) const {
return false;
}
-bool TimeZoneLibC::PrevTransition(const time_point<seconds>& tp,
- time_zone::civil_transition* trans) const {
+bool TimeZoneLibC::PrevTransition(const time_point<seconds>&,
+ time_zone::civil_transition*) const {
return false;
}
@@ -288,5 +305,5 @@ std::string TimeZoneLibC::Description() const {
} // namespace cctz
} // namespace time_internal
-} // inline namespace lts_2018_12_18
+} // inline namespace lts_2019_08_08
} // namespace absl
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-27 20:03:02 +0000