- fd5f3d7077270ffc5ea74cdb9e18bbae3b9b46aa Fix typo optional -> variant by Abseil Team <absl-team@google.com>
- 9136c06dfa8dbfdde0a427ad3509e34763d607a6 Fix string_view_test and str_cat_test build under MSVC de... by Derek Mauro <dmauro@google.com> - a463820f9441888f4368aa87328599e3209f9b07 Removes constexpr optional<T>::operator->(). This was don... by Abseil Team <absl-team@google.com> - 3bf78a7f126daafff329f7815d507422f1ca378d Remove dependencies on external CCTZ project. by Shaindel Schwartz <shaindel@google.com> - a4ae574a11b1ddf6e88459af3d638cf79aea7ecd Internal change by Jon Cohen <cohenjon@google.com> GitOrigin-RevId: fd5f3d7077270ffc5ea74cdb9e18bbae3b9b46aa Change-Id: I6ab8ab99863716fe9b2745a12ef285f7a6da6d1epull/117/head
Abseil Team
7 years ago
committed by
Derek Mauro
parent
94ce52d46c
commit
af7882601a
638 changed files with 9262 additions and 58 deletions
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# Copyright 2016 Google Inc. All Rights Reserved. |
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# |
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# Licensed under the Apache License, Version 2.0 (the "License"); |
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# you may not use this file except in compliance with the License. |
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# You may obtain a copy of the License at |
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# |
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# http://www.apache.org/licenses/LICENSE-2.0 |
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# |
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# Unless required by applicable law or agreed to in writing, software |
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# distributed under the License is distributed on an "AS IS" BASIS, |
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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# See the License for the specific language governing permissions and |
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# limitations under the License. |
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|
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licenses(["notice"]) # Apache License |
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|
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### libraries |
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cc_library( |
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name = "includes", |
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textual_hdrs = [ |
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"include/cctz/civil_time.h", |
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"include/cctz/civil_time_detail.h", |
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"include/cctz/time_zone.h", |
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], |
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visibility = ["//absl/time:__pkg__"], |
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) |
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cc_library( |
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name = "civil_time", |
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srcs = ["src/civil_time_detail.cc"], |
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hdrs = [ |
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"include/cctz/civil_time.h", |
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], |
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textual_hdrs = ["include/cctz/civil_time_detail.h"], |
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visibility = ["//visibility:public"], |
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) |
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|
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cc_library( |
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name = "time_zone", |
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srcs = [ |
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"src/time_zone_fixed.cc", |
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"src/time_zone_fixed.h", |
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"src/time_zone_format.cc", |
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"src/time_zone_if.cc", |
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"src/time_zone_if.h", |
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"src/time_zone_impl.cc", |
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"src/time_zone_impl.h", |
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"src/time_zone_info.cc", |
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"src/time_zone_info.h", |
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"src/time_zone_libc.cc", |
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"src/time_zone_libc.h", |
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"src/time_zone_lookup.cc", |
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"src/time_zone_posix.cc", |
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"src/time_zone_posix.h", |
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"src/tzfile.h", |
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"src/zone_info_source.cc", |
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], |
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hdrs = [ |
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"include/cctz/time_zone.h", |
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"include/cctz/zone_info_source.h", |
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], |
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visibility = ["//visibility:public"], |
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deps = [":civil_time"], |
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) |
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|
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### tests |
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cc_test( |
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name = "civil_time_test", |
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size = "small", |
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srcs = ["src/civil_time_test.cc"], |
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deps = [ |
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":civil_time", |
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"@com_google_googletest//:gtest_main", |
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], |
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) |
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|
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cc_test( |
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name = "time_zone_format_test", |
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size = "small", |
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srcs = ["src/time_zone_format_test.cc"], |
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deps = [ |
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":civil_time", |
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":time_zone", |
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"@com_google_googletest//:gtest_main", |
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], |
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) |
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|
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cc_test( |
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name = "time_zone_lookup_test", |
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size = "small", |
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srcs = ["src/time_zone_lookup_test.cc"], |
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deps = [ |
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":civil_time", |
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":time_zone", |
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"@com_google_googletest//:gtest_main", |
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], |
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) |
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### benchmarks |
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### examples |
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### binaries |
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@ -0,0 +1,329 @@ |
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// Copyright 2016 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
|
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
|
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// Unless required by applicable law or agreed to in writing, software
|
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// distributed under the License is distributed on an "AS IS" BASIS,
|
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef ABSL_TIME_INTERNAL_CCTZ_CIVIL_TIME_H_ |
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#define ABSL_TIME_INTERNAL_CCTZ_CIVIL_TIME_H_ |
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#include "absl/time/internal/cctz/include/cctz/civil_time_detail.h" |
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namespace absl { |
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namespace time_internal { |
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namespace cctz { |
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|
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// The term "civil time" refers to the legally recognized human-scale time
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// that is represented by the six fields YYYY-MM-DD hh:mm:ss. Modern-day civil
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// time follows the Gregorian Calendar and is a time-zone-independent concept.
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// A "date" is perhaps the most common example of a civil time (represented in
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// this library as cctz::civil_day). This library provides six classes and a
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// handful of functions that help with rounding, iterating, and arithmetic on
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// civil times while avoiding complications like daylight-saving time (DST).
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//
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// The following six classes form the core of this civil-time library:
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//
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// * civil_second
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// * civil_minute
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// * civil_hour
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// * civil_day
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// * civil_month
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// * civil_year
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//
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// Each class is a simple value type with the same interface for construction
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// and the same six accessors for each of the civil fields (year, month, day,
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// hour, minute, and second, aka YMDHMS). These classes differ only in their
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// alignment, which is indicated by the type name and specifies the field on
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// which arithmetic operates.
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//
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// Each class can be constructed by passing up to six optional integer
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// arguments representing the YMDHMS fields (in that order) to the
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// constructor. Omitted fields are assigned their minimum valid value. Hours,
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// minutes, and seconds will be set to 0, month and day will be set to 1, and
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// since there is no minimum valid year, it will be set to 1970. So, a
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// default-constructed civil-time object will have YMDHMS fields representing
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// "1970-01-01 00:00:00". Fields that are out-of-range are normalized (e.g.,
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// October 32 -> November 1) so that all civil-time objects represent valid
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// values.
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//
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// Each civil-time class is aligned to the civil-time field indicated in the
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// class's name after normalization. Alignment is performed by setting all the
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// inferior fields to their minimum valid value (as described above). The
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// following are examples of how each of the six types would align the fields
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// representing November 22, 2015 at 12:34:56 in the afternoon. (Note: the
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// std::string format used here is not important; it's just a shorthand way of
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// showing the six YMDHMS fields.)
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//
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// civil_second 2015-11-22 12:34:56
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// civil_minute 2015-11-22 12:34:00
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// civil_hour 2015-11-22 12:00:00
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// civil_day 2015-11-22 00:00:00
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// civil_month 2015-11-01 00:00:00
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// civil_year 2015-01-01 00:00:00
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//
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// Each civil-time type performs arithmetic on the field to which it is
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// aligned. This means that adding 1 to a civil_day increments the day field
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// (normalizing as necessary), and subtracting 7 from a civil_month operates
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// on the month field (normalizing as necessary). All arithmetic produces a
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// valid civil time. Difference requires two similarly aligned civil-time
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// objects and returns the scalar answer in units of the objects' alignment.
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// For example, the difference between two civil_hour objects will give an
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// answer in units of civil hours.
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//
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// In addition to the six civil-time types just described, there are
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// a handful of helper functions and algorithms for performing common
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// calculations. These are described below.
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//
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// Note: In C++14 and later, this library is usable in a constexpr context.
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//
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// CONSTRUCTION:
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//
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// Each of the civil-time types can be constructed in two ways: by directly
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// passing to the constructor up to six (optional) integers representing the
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// YMDHMS fields, or by copying the YMDHMS fields from a differently aligned
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// civil-time type.
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//
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// civil_day default_value; // 1970-01-01 00:00:00
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//
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// civil_day a(2015, 2, 3); // 2015-02-03 00:00:00
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// civil_day b(2015, 2, 3, 4, 5, 6); // 2015-02-03 00:00:00
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// civil_day c(2015); // 2015-01-01 00:00:00
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//
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// civil_second ss(2015, 2, 3, 4, 5, 6); // 2015-02-03 04:05:06
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// civil_minute mm(ss); // 2015-02-03 04:05:00
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// civil_hour hh(mm); // 2015-02-03 04:00:00
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// civil_day d(hh); // 2015-02-03 00:00:00
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// civil_month m(d); // 2015-02-01 00:00:00
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// civil_year y(m); // 2015-01-01 00:00:00
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//
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// m = civil_month(y); // 2015-01-01 00:00:00
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// d = civil_day(m); // 2015-01-01 00:00:00
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// hh = civil_hour(d); // 2015-01-01 00:00:00
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// mm = civil_minute(hh); // 2015-01-01 00:00:00
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// ss = civil_second(mm); // 2015-01-01 00:00:00
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//
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// ALIGNMENT CONVERSION:
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//
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// The alignment of a civil-time object cannot change, but the object may be
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// used to construct a new object with a different alignment. This is referred
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// to as "realigning". When realigning to a type with the same or more
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// precision (e.g., civil_day -> civil_second), the conversion may be
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// performed implicitly since no information is lost. However, if information
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// could be discarded (e.g., civil_second -> civil_day), the conversion must
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// be explicit at the call site.
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//
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// void fun(const civil_day& day);
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//
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// civil_second cs;
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// fun(cs); // Won't compile because data may be discarded
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// fun(civil_day(cs)); // OK: explicit conversion
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//
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// civil_day cd;
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// fun(cd); // OK: no conversion needed
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//
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// civil_month cm;
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// fun(cm); // OK: implicit conversion to civil_day
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//
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// NORMALIZATION:
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//
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// Integer arguments passed to the constructor may be out-of-range, in which
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// case they are normalized to produce a valid civil-time object. This enables
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// natural arithmetic on constructor arguments without worrying about the
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// field's range. Normalization guarantees that there are no invalid
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// civil-time objects.
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//
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// civil_day d(2016, 10, 32); // Out-of-range day; normalized to 2016-11-01
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//
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// Note: If normalization is undesired, you can signal an error by comparing
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// the constructor arguments to the normalized values returned by the YMDHMS
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// properties.
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//
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// PROPERTIES:
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//
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// All civil-time types have accessors for all six of the civil-time fields:
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// year, month, day, hour, minute, and second. Recall that fields inferior to
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// the type's aligment will be set to their minimum valid value.
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//
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// civil_day d(2015, 6, 28);
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// // d.year() == 2015
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// // d.month() == 6
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// // d.day() == 28
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// // d.hour() == 0
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// // d.minute() == 0
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// // d.second() == 0
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//
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// COMPARISON:
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//
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// Comparison always considers all six YMDHMS fields, regardless of the type's
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// alignment. Comparison between differently aligned civil-time types is
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// allowed.
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//
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// civil_day feb_3(2015, 2, 3); // 2015-02-03 00:00:00
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// civil_day mar_4(2015, 3, 4); // 2015-03-04 00:00:00
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// // feb_3 < mar_4
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// // civil_year(feb_3) == civil_year(mar_4)
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//
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// civil_second feb_3_noon(2015, 2, 3, 12, 0, 0); // 2015-02-03 12:00:00
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// // feb_3 < feb_3_noon
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// // feb_3 == civil_day(feb_3_noon)
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//
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// // Iterates all the days of February 2015.
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// for (civil_day d(2015, 2, 1); d < civil_month(2015, 3); ++d) {
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// // ...
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// }
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//
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// STREAMING:
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//
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// Each civil-time type may be sent to an output stream using operator<<().
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// The output format follows the pattern "YYYY-MM-DDThh:mm:ss" where fields
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// inferior to the type's alignment are omitted.
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//
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// civil_second cs(2015, 2, 3, 4, 5, 6);
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// std::cout << cs << "\n"; // Outputs: 2015-02-03T04:05:06
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//
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// civil_day cd(cs);
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// std::cout << cd << "\n"; // Outputs: 2015-02-03
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//
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// civil_year cy(cs);
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// std::cout << cy << "\n"; // Outputs: 2015
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//
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// ARITHMETIC:
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//
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// Civil-time types support natural arithmetic operators such as addition,
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// subtraction, and difference. Arithmetic operates on the civil-time field
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// indicated in the type's name. Difference requires arguments with the same
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// alignment and returns the answer in units of the alignment.
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//
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// civil_day a(2015, 2, 3);
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// ++a; // 2015-02-04 00:00:00
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// --a; // 2015-02-03 00:00:00
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// civil_day b = a + 1; // 2015-02-04 00:00:00
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// civil_day c = 1 + b; // 2015-02-05 00:00:00
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// int n = c - a; // n = 2 (civil days)
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// int m = c - civil_month(c); // Won't compile: different types.
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//
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// EXAMPLE: Adding a month to January 31.
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//
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// One of the classic questions that arises when considering a civil-time
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// library (or a date library or a date/time library) is this: "What happens
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// when you add a month to January 31?" This is an interesting question
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// because there could be a number of possible answers:
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//
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// 1. March 3 (or 2 if a leap year). This may make sense if the operation
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// wants the equivalent of February 31.
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// 2. February 28 (or 29 if a leap year). This may make sense if the operation
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// wants the last day of January to go to the last day of February.
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// 3. Error. The caller may get some error, an exception, an invalid date
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// object, or maybe false is returned. This may make sense because there is
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// no single unambiguously correct answer to the question.
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//
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// Practically speaking, any answer that is not what the programmer intended
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// is the wrong answer.
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//
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// This civil-time library avoids the problem by making it impossible to ask
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// ambiguous questions. All civil-time objects are aligned to a particular
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// civil-field boundary (such as aligned to a year, month, day, hour, minute,
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// or second), and arithmetic operates on the field to which the object is
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// aligned. This means that in order to "add a month" the object must first be
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// aligned to a month boundary, which is equivalent to the first day of that
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// month.
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//
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// Of course, there are ways to compute an answer the question at hand using
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// this civil-time library, but they require the programmer to be explicit
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// about the answer they expect. To illustrate, let's see how to compute all
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// three of the above possible answers to the question of "Jan 31 plus 1
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// month":
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//
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// const civil_day d(2015, 1, 31);
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//
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// // Answer 1:
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// // Add 1 to the month field in the constructor, and rely on normalization.
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// const auto ans_normalized = civil_day(d.year(), d.month() + 1, d.day());
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// // ans_normalized == 2015-03-03 (aka Feb 31)
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//
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// // Answer 2:
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// // Add 1 to month field, capping to the end of next month.
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// const auto next_month = civil_month(d) + 1;
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// const auto last_day_of_next_month = civil_day(next_month + 1) - 1;
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// const auto ans_capped = std::min(ans_normalized, last_day_of_next_month);
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// // ans_capped == 2015-02-28
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//
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// // Answer 3:
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// // Signal an error if the normalized answer is not in next month.
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// if (civil_month(ans_normalized) != next_month) {
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// // error, month overflow
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// }
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//
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using civil_year = detail::civil_year; |
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using civil_month = detail::civil_month; |
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using civil_day = detail::civil_day; |
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using civil_hour = detail::civil_hour; |
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using civil_minute = detail::civil_minute; |
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using civil_second = detail::civil_second; |
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// An enum class with members monday, tuesday, wednesday, thursday, friday,
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// saturday, and sunday. These enum values may be sent to an output stream
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// using operator<<(). The result is the full weekday name in English with a
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// leading capital letter.
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//
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// weekday wd = weekday::thursday;
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// std::cout << wd << "\n"; // Outputs: Thursday
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//
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using detail::weekday; |
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// Returns the weekday for the given civil_day.
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//
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// civil_day a(2015, 8, 13);
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// weekday wd = get_weekday(a); // wd == weekday::thursday
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//
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using detail::get_weekday; |
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// Returns the civil_day that strictly follows or precedes the given
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// civil_day, and that falls on the given weekday.
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//
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// For example, given:
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//
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// August 2015
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// Su Mo Tu We Th Fr Sa
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// 1
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// 2 3 4 5 6 7 8
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// 9 10 11 12 13 14 15
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// 16 17 18 19 20 21 22
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// 23 24 25 26 27 28 29
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// 30 31
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//
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// civil_day a(2015, 8, 13); // get_weekday(a) == weekday::thursday
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// civil_day b = next_weekday(a, weekday::thursday); // b = 2015-08-20
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// civil_day c = prev_weekday(a, weekday::thursday); // c = 2015-08-06
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//
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// civil_day d = ...
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// // Gets the following Thursday if d is not already Thursday
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// civil_day thurs1 = prev_weekday(d, weekday::thursday) + 7;
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// // Gets the previous Thursday if d is not already Thursday
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// civil_day thurs2 = next_weekday(d, weekday::thursday) - 7;
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//
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using detail::next_weekday; |
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using detail::prev_weekday; |
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// Returns the day-of-year for the given civil_day.
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//
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// civil_day a(2015, 1, 1);
|
||||
// int yd_jan_1 = get_yearday(a); // yd_jan_1 = 1
|
||||
// civil_day b(2015, 12, 31);
|
||||
// int yd_dec_31 = get_yearday(b); // yd_dec_31 = 365
|
||||
//
|
||||
using detail::get_yearday; |
||||
|
||||
} // namespace cctz
|
||||
} // namespace time_internal
|
||||
} // namespace absl
|
||||
|
||||
#endif // ABSL_TIME_INTERNAL_CCTZ_CIVIL_TIME_H_
|
||||
@ -0,0 +1,564 @@ |
||||
// 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
|
||||
//
|
||||
// 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 ABSL_TIME_INTERNAL_CCTZ_CIVIL_TIME_DETAIL_H_ |
||||
#define ABSL_TIME_INTERNAL_CCTZ_CIVIL_TIME_DETAIL_H_ |
||||
|
||||
#include <cstdint> |
||||
#include <limits> |
||||
#include <ostream> |
||||
#include <type_traits> |
||||
|
||||
// Disable constexpr support unless we are using clang in C++14 mode.
|
||||
#if __clang__ && __cpp_constexpr >= 201304 |
||||
#define CONSTEXPR_D constexpr // data
|
||||
#define CONSTEXPR_F constexpr // function
|
||||
#define CONSTEXPR_M constexpr // member
|
||||
#else |
||||
#define CONSTEXPR_D const |
||||
#define CONSTEXPR_F inline |
||||
#define CONSTEXPR_M |
||||
#endif |
||||
|
||||
namespace absl { |
||||
namespace time_internal { |
||||
namespace cctz { |
||||
|
||||
// Support years that at least span the range of 64-bit time_t values.
|
||||
using year_t = std::int_fast64_t; |
||||
|
||||
// Type alias that indicates an argument is not normalized (e.g., the
|
||||
// constructor parameters and operands/results of addition/subtraction).
|
||||
using diff_t = std::int_fast64_t; |
||||
|
||||
namespace detail { |
||||
|
||||
// Type aliases that indicate normalized argument values.
|
||||
using month_t = std::int_fast8_t; // [1:12]
|
||||
using day_t = std::int_fast8_t; // [1:31]
|
||||
using hour_t = std::int_fast8_t; // [0:23]
|
||||
using minute_t = std::int_fast8_t; // [0:59]
|
||||
using second_t = std::int_fast8_t; // [0:59]
|
||||
|
||||
// Normalized civil-time fields: Y-M-D HH:MM:SS.
|
||||
struct fields { |
||||
CONSTEXPR_M fields(year_t year, month_t month, day_t day, |
||||
hour_t hour, minute_t minute, second_t second) |
||||
: y(year), m(month), d(day), hh(hour), mm(minute), ss(second) {} |
||||
std::int_least64_t y; |
||||
std::int_least8_t m; |
||||
std::int_least8_t d; |
||||
std::int_least8_t hh; |
||||
std::int_least8_t mm; |
||||
std::int_least8_t ss; |
||||
}; |
||||
|
||||
struct second_tag {}; |
||||
struct minute_tag : second_tag {}; |
||||
struct hour_tag : minute_tag {}; |
||||
struct day_tag : hour_tag {}; |
||||
struct month_tag : day_tag {}; |
||||
struct year_tag : month_tag {}; |
||||
|
||||
////////////////////////////////////////////////////////////////////////
|
||||
|
||||
// Field normalization (without avoidable overflow).
|
||||
|
||||
namespace impl { |
||||
|
||||
CONSTEXPR_F bool is_leap_year(year_t y) noexcept { |
||||
return y % 4 == 0 && (y % 100 != 0 || y % 400 == 0); |
||||
} |
||||
CONSTEXPR_F int year_index(year_t y, month_t m) noexcept { |
||||
return (static_cast<int>((y + (m > 2)) % 400) + 400) % 400; |
||||
} |
||||
CONSTEXPR_F int days_per_century(year_t y, month_t m) noexcept { |
||||
const int yi = year_index(y, m); |
||||
return 36524 + (yi == 0 || yi > 300); |
||||
} |
||||
CONSTEXPR_F int days_per_4years(year_t y, month_t m) noexcept { |
||||
const int yi = year_index(y, m); |
||||
return 1460 + (yi == 0 || yi > 300 || (yi - 1) % 100 < 96); |
||||
} |
||||
CONSTEXPR_F int days_per_year(year_t y, month_t m) noexcept { |
||||
return is_leap_year(y + (m > 2)) ? 366 : 365; |
||||
} |
||||
CONSTEXPR_F int days_per_month(year_t y, month_t m) noexcept { |
||||
CONSTEXPR_D int k_days_per_month[1 + 12] = { |
||||
-1, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 // non leap year
|
||||
}; |
||||
return k_days_per_month[m] + (m == 2 && is_leap_year(y)); |
||||
} |
||||
|
||||
CONSTEXPR_F fields n_day(year_t y, month_t m, diff_t d, diff_t cd, |
||||
hour_t hh, minute_t mm, second_t ss) noexcept { |
||||
y += (cd / 146097) * 400; |
||||
cd %= 146097; |
||||
if (cd < 0) { |
||||
y -= 400; |
||||
cd += 146097; |
||||
} |
||||
y += (d / 146097) * 400; |
||||
d = d % 146097 + cd; |
||||
if (d > 0) { |
||||
if (d > 146097) { |
||||
y += 400; |
||||
d -= 146097; |
||||
} |
||||
} else { |
||||
if (d > -365) { |
||||
// We often hit the previous year when stepping a civil time backwards,
|
||||
// so special case it to avoid counting up by 100/4/1-year chunks.
|
||||
y -= 1; |
||||
d += days_per_year(y, m); |
||||
} else { |
||||
y -= 400; |
||||
d += 146097; |
||||
} |
||||
} |
||||
if (d > 365) { |
||||
for (int n = days_per_century(y, m); d > n; n = days_per_century(y, m)) { |
||||
d -= n; |
||||
y += 100; |
||||
} |
||||
for (int n = days_per_4years(y, m); d > n; n = days_per_4years(y, m)) { |
||||
d -= n; |
||||
y += 4; |
||||
} |
||||
for (int n = days_per_year(y, m); d > n; n = days_per_year(y, m)) { |
||||
d -= n; |
||||
++y; |
||||
} |
||||
} |
||||
if (d > 28) { |
||||
for (int n = days_per_month(y, m); d > n; n = days_per_month(y, m)) { |
||||
d -= n; |
||||
if (++m > 12) { |
||||
++y; |
||||
m = 1; |
||||
} |
||||
} |
||||
} |
||||
return fields(y, m, static_cast<day_t>(d), hh, mm, ss); |
||||
} |
||||
CONSTEXPR_F fields n_mon(year_t y, diff_t m, diff_t d, diff_t cd, |
||||
hour_t hh, minute_t mm, second_t ss) noexcept { |
||||
if (m != 12) { |
||||
y += m / 12; |
||||
m %= 12; |
||||
if (m <= 0) { |
||||
y -= 1; |
||||
m += 12; |
||||
} |
||||
} |
||||
return n_day(y, static_cast<month_t>(m), d, cd, hh, mm, ss); |
||||
} |
||||
CONSTEXPR_F fields n_hour(year_t y, diff_t m, diff_t d, diff_t cd, |
||||
diff_t hh, minute_t mm, second_t ss) noexcept { |
||||
cd += hh / 24; |
||||
hh %= 24; |
||||
if (hh < 0) { |
||||
cd -= 1; |
||||
hh += 24; |
||||
} |
||||
return n_mon(y, m, d, cd, static_cast<hour_t>(hh), mm, ss); |
||||
} |
||||
CONSTEXPR_F fields n_min(year_t y, diff_t m, diff_t d, diff_t hh, diff_t ch, |
||||
diff_t mm, second_t ss) noexcept { |
||||
ch += mm / 60; |
||||
mm %= 60; |
||||
if (mm < 0) { |
||||
ch -= 1; |
||||
mm += 60; |
||||
} |
||||
return n_hour(y, m, d, hh / 24 + ch / 24, hh % 24 + ch % 24, |
||||
static_cast<minute_t>(mm), ss); |
||||
} |
||||
CONSTEXPR_F fields n_sec(year_t y, diff_t m, diff_t d, diff_t hh, diff_t mm, |
||||
diff_t ss) noexcept { |
||||
// Optimization for when (non-constexpr) fields are already normalized.
|
||||
if (0 <= ss && ss < 60) { |
||||
const second_t nss = static_cast<second_t>(ss); |
||||
if (0 <= mm && mm < 60) { |
||||
const minute_t nmm = static_cast<minute_t>(mm); |
||||
if (0 <= hh && hh < 24) { |
||||
const hour_t nhh = static_cast<hour_t>(hh); |
||||
if (1 <= d && d <= 28 && 1 <= m && m <= 12) { |
||||
const day_t nd = static_cast<day_t>(d); |
||||
const month_t nm = static_cast<month_t>(m); |
||||
return fields(y, nm, nd, nhh, nmm, nss); |
||||
} |
||||
return n_mon(y, m, d, 0, nhh, nmm, nss); |
||||
} |
||||
return n_hour(y, m, d, hh / 24, hh % 24, nmm, nss); |
||||
} |
||||
return n_min(y, m, d, hh, mm / 60, mm % 60, nss); |
||||
} |
||||
diff_t cm = ss / 60; |
||||
ss %= 60; |
||||
if (ss < 0) { |
||||
cm -= 1; |
||||
ss += 60; |
||||
} |
||||
return n_min(y, m, d, hh, mm / 60 + cm / 60, mm % 60 + cm % 60, |
||||
static_cast<second_t>(ss)); |
||||
} |
||||
|
||||
} // namespace impl
|
||||
|
||||
////////////////////////////////////////////////////////////////////////
|
||||
|
||||
// Increments the indicated (normalized) field by "n".
|
||||
CONSTEXPR_F fields step(second_tag, fields f, diff_t n) noexcept { |
||||
return impl::n_sec(f.y, f.m, f.d, f.hh, f.mm + n / 60, f.ss + n % 60); |
||||
} |
||||
CONSTEXPR_F fields step(minute_tag, fields f, diff_t n) noexcept { |
||||
return impl::n_min(f.y, f.m, f.d, f.hh + n / 60, 0, f.mm + n % 60, f.ss); |
||||
} |
||||
CONSTEXPR_F fields step(hour_tag, fields f, diff_t n) noexcept { |
||||
return impl::n_hour(f.y, f.m, f.d + n / 24, 0, f.hh + n % 24, f.mm, f.ss); |
||||
} |
||||
CONSTEXPR_F fields step(day_tag, fields f, diff_t n) noexcept { |
||||
return impl::n_day(f.y, f.m, f.d, n, f.hh, f.mm, f.ss); |
||||
} |
||||
CONSTEXPR_F fields step(month_tag, fields f, diff_t n) noexcept { |
||||
return impl::n_mon(f.y + n / 12, f.m + n % 12, f.d, 0, f.hh, f.mm, f.ss); |
||||
} |
||||
CONSTEXPR_F fields step(year_tag, fields f, diff_t n) noexcept { |
||||
return fields(f.y + n, f.m, f.d, f.hh, f.mm, f.ss); |
||||
} |
||||
|
||||
////////////////////////////////////////////////////////////////////////
|
||||
|
||||
namespace impl { |
||||
|
||||
// Returns (v * f + a) but avoiding intermediate overflow when possible.
|
||||
CONSTEXPR_F diff_t scale_add(diff_t v, diff_t f, diff_t a) noexcept { |
||||
return (v < 0) ? ((v + 1) * f + a) - f : ((v - 1) * f + a) + f; |
||||
} |
||||
|
||||
// Map a (normalized) Y/M/D to the number of days before/after 1970-01-01.
|
||||
// Probably overflows for years outside [-292277022656:292277026595].
|
||||
CONSTEXPR_F diff_t ymd_ord(year_t y, month_t m, day_t d) noexcept { |
||||
const diff_t eyear = (m <= 2) ? y - 1 : y; |
||||
const diff_t era = (eyear >= 0 ? eyear : eyear - 399) / 400; |
||||
const diff_t yoe = eyear - era * 400; |
||||
const diff_t doy = (153 * (m + (m > 2 ? -3 : 9)) + 2) / 5 + d - 1; |
||||
const diff_t doe = yoe * 365 + yoe / 4 - yoe / 100 + doy; |
||||
return era * 146097 + doe - 719468; |
||||
} |
||||
|
||||
// Returns the difference in days between two normalized Y-M-D tuples.
|
||||
// ymd_ord() will encounter integer overflow given extreme year values,
|
||||
// yet the difference between two such extreme values may actually be
|
||||
// small, so we take a little care to avoid overflow when possible by
|
||||
// exploiting the 146097-day cycle.
|
||||
CONSTEXPR_F diff_t day_difference(year_t y1, month_t m1, day_t d1, |
||||
year_t y2, month_t m2, day_t d2) noexcept { |
||||
const diff_t a_c4_off = y1 % 400; |
||||
const diff_t b_c4_off = y2 % 400; |
||||
diff_t c4_diff = (y1 - a_c4_off) - (y2 - b_c4_off); |
||||
diff_t delta = ymd_ord(a_c4_off, m1, d1) - ymd_ord(b_c4_off, m2, d2); |
||||
if (c4_diff > 0 && delta < 0) { |
||||
delta += 2 * 146097; |
||||
c4_diff -= 2 * 400; |
||||
} else if (c4_diff < 0 && delta > 0) { |
||||
delta -= 2 * 146097; |
||||
c4_diff += 2 * 400; |
||||
} |
||||
return (c4_diff / 400 * 146097) + delta; |
||||
} |
||||
|
||||
} // namespace impl
|
||||
|
||||
// Returns the difference between fields structs using the indicated unit.
|
||||
CONSTEXPR_F diff_t difference(year_tag, fields f1, fields f2) noexcept { |
||||
return f1.y - f2.y; |
||||
} |
||||
CONSTEXPR_F diff_t difference(month_tag, fields f1, fields f2) noexcept { |
||||
return impl::scale_add(difference(year_tag{}, f1, f2), 12, (f1.m - f2.m)); |
||||
} |
||||
CONSTEXPR_F diff_t difference(day_tag, fields f1, fields f2) noexcept { |
||||
return impl::day_difference(f1.y, f1.m, f1.d, f2.y, f2.m, f2.d); |
||||
} |
||||
CONSTEXPR_F diff_t difference(hour_tag, fields f1, fields f2) noexcept { |
||||
return impl::scale_add(difference(day_tag{}, f1, f2), 24, (f1.hh - f2.hh)); |
||||
} |
||||
CONSTEXPR_F diff_t difference(minute_tag, fields f1, fields f2) noexcept { |
||||
return impl::scale_add(difference(hour_tag{}, f1, f2), 60, (f1.mm - f2.mm)); |
||||
} |
||||
CONSTEXPR_F diff_t difference(second_tag, fields f1, fields f2) noexcept { |
||||
return impl::scale_add(difference(minute_tag{}, f1, f2), 60, f1.ss - f2.ss); |
||||
} |
||||
|
||||
////////////////////////////////////////////////////////////////////////
|
||||
|
||||
// Aligns the (normalized) fields struct to the indicated field.
|
||||
CONSTEXPR_F fields align(second_tag, fields f) noexcept { |
||||
return f; |
||||
} |
||||
CONSTEXPR_F fields align(minute_tag, fields f) noexcept { |
||||
return fields{f.y, f.m, f.d, f.hh, f.mm, 0}; |
||||
} |
||||
CONSTEXPR_F fields align(hour_tag, fields f) noexcept { |
||||
return fields{f.y, f.m, f.d, f.hh, 0, 0}; |
||||
} |
||||
CONSTEXPR_F fields align(day_tag, fields f) noexcept { |
||||
return fields{f.y, f.m, f.d, 0, 0, 0}; |
||||
} |
||||
CONSTEXPR_F fields align(month_tag, fields f) noexcept { |
||||
return fields{f.y, f.m, 1, 0, 0, 0}; |
||||
} |
||||
CONSTEXPR_F fields align(year_tag, fields f) noexcept { |
||||
return fields{f.y, 1, 1, 0, 0, 0}; |
||||
} |
||||
|
||||
////////////////////////////////////////////////////////////////////////
|
||||
|
||||
template <typename T> |
||||
class civil_time { |
||||
public: |
||||
explicit CONSTEXPR_M civil_time(year_t y, diff_t m = 1, diff_t d = 1, |
||||
diff_t hh = 0, diff_t mm = 0, |
||||
diff_t ss = 0) noexcept |
||||
: civil_time(impl::n_sec(y, m, d, hh, mm, ss)) {} |
||||
|
||||
CONSTEXPR_M civil_time() noexcept : f_{1970, 1, 1, 0, 0, 0} {} |
||||
civil_time(const civil_time&) = default; |
||||
civil_time& operator=(const civil_time&) = default; |
||||
|
||||
// Conversion between civil times of different alignment. Conversion to
|
||||
// a more precise alignment is allowed implicitly (e.g., day -> hour),
|
||||
// but conversion where information is discarded must be explicit
|
||||
// (e.g., second -> minute).
|
||||
template <typename U, typename S> |
||||
using preserves_data = |
||||
typename std::enable_if<std::is_base_of<U, S>::value>::type; |
||||
template <typename U> |
||||
CONSTEXPR_M civil_time(const civil_time<U>& ct, |
||||
preserves_data<T, U>* = nullptr) noexcept |
||||
: civil_time(ct.f_) {} |
||||
template <typename U> |
||||
explicit CONSTEXPR_M civil_time(const civil_time<U>& ct, |
||||
preserves_data<U, T>* = nullptr) noexcept |
||||
: civil_time(ct.f_) {} |
||||
|
||||
// Factories for the maximum/minimum representable civil_time.
|
||||
static civil_time max() { |
||||
const auto max_year = std::numeric_limits<std::int_least64_t>::max(); |
||||
return civil_time(max_year, 12, 31, 23, 59, 59); |
||||
} |
||||
static civil_time min() { |
||||
const auto min_year = std::numeric_limits<std::int_least64_t>::min(); |
||||
return civil_time(min_year, 1, 1, 0, 0, 0); |
||||
} |
||||
|
||||
// Field accessors. Note: All but year() return an int.
|
||||
CONSTEXPR_M year_t year() const noexcept { return f_.y; } |
||||
CONSTEXPR_M int month() const noexcept { return f_.m; } |
||||
CONSTEXPR_M int day() const noexcept { return f_.d; } |
||||
CONSTEXPR_M int hour() const noexcept { return f_.hh; } |
||||
CONSTEXPR_M int minute() const noexcept { return f_.mm; } |
||||
CONSTEXPR_M int second() const noexcept { return f_.ss; } |
||||
|
||||
// Assigning arithmetic.
|
||||
CONSTEXPR_M civil_time& operator+=(diff_t n) noexcept { |
||||
f_ = step(T{}, f_, n); |
||||
return *this; |
||||
} |
||||
CONSTEXPR_M civil_time& operator-=(diff_t n) noexcept { |
||||
if (n != std::numeric_limits<diff_t>::min()) { |
||||
f_ = step(T{}, f_, -n); |
||||
} else { |
||||
f_ = step(T{}, step(T{}, f_, -(n + 1)), 1); |
||||
} |
||||
return *this; |
||||
} |
||||
CONSTEXPR_M civil_time& operator++() noexcept { |
||||
return *this += 1; |
||||
} |
||||
CONSTEXPR_M civil_time operator++(int) noexcept { |
||||
const civil_time a = *this; |
||||
++*this; |
||||
return a; |
||||
} |
||||
CONSTEXPR_M civil_time& operator--() noexcept { |
||||
return *this -= 1; |
||||
} |
||||
CONSTEXPR_M civil_time operator--(int) noexcept { |
||||
const civil_time a = *this; |
||||
--*this; |
||||
return a; |
||||
} |
||||
|
||||
// Binary arithmetic operators.
|
||||
inline friend CONSTEXPR_M civil_time operator+(civil_time a, |
||||
diff_t n) noexcept { |
||||
return a += n; |
||||
} |
||||
inline friend CONSTEXPR_M civil_time operator+(diff_t n, |
||||
civil_time a) noexcept { |
||||
return a += n; |
||||
} |
||||
inline friend CONSTEXPR_M civil_time operator-(civil_time a, |
||||
diff_t n) noexcept { |
||||
return a -= n; |
||||
} |
||||
inline friend CONSTEXPR_M diff_t operator-(const civil_time& lhs, |
||||
const civil_time& rhs) noexcept { |
||||
return difference(T{}, lhs.f_, rhs.f_); |
||||
} |
||||
|
||||
private: |
||||
// All instantiations of this template are allowed to call the following
|
||||
// private constructor and access the private fields member.
|
||||
template <typename U> |
||||
friend class civil_time; |
||||
|
||||
// The designated constructor that all others eventually call.
|
||||
explicit CONSTEXPR_M civil_time(fields f) noexcept : f_(align(T{}, f)) {} |
||||
|
||||
fields f_; |
||||
}; |
||||
|
||||
// Disallows difference between differently aligned types.
|
||||
// auto n = civil_day(...) - civil_hour(...); // would be confusing.
|
||||
template <typename Tag1, typename Tag2> |
||||
CONSTEXPR_F diff_t operator-(civil_time<Tag1>, civil_time<Tag2>) = delete; |
||||
|
||||
using civil_year = civil_time<year_tag>; |
||||
using civil_month = civil_time<month_tag>; |
||||
using civil_day = civil_time<day_tag>; |
||||
using civil_hour = civil_time<hour_tag>; |
||||
using civil_minute = civil_time<minute_tag>; |
||||
using civil_second = civil_time<second_tag>; |
||||
|
||||
////////////////////////////////////////////////////////////////////////
|
||||
|
||||
// Relational operators that work with differently aligned objects.
|
||||
// Always compares all six fields.
|
||||
template <typename T1, typename T2> |
||||
CONSTEXPR_F bool operator<(const civil_time<T1>& lhs, |
||||
const civil_time<T2>& rhs) noexcept { |
||||
return (lhs.year() < rhs.year() || |
||||
(lhs.year() == rhs.year() && |
||||
(lhs.month() < rhs.month() || |
||||
(lhs.month() == rhs.month() && |
||||
(lhs.day() < rhs.day() || |
||||
(lhs.day() == rhs.day() && |
||||
(lhs.hour() < rhs.hour() || |
||||
(lhs.hour() == rhs.hour() && |
||||
(lhs.minute() < rhs.minute() || |
||||
(lhs.minute() == rhs.minute() && |
||||
(lhs.second() < rhs.second()))))))))))); |
||||
} |
||||
template <typename T1, typename T2> |
||||
CONSTEXPR_F bool operator<=(const civil_time<T1>& lhs, |
||||
const civil_time<T2>& rhs) noexcept { |
||||
return !(rhs < lhs); |
||||
} |
||||
template <typename T1, typename T2> |
||||
CONSTEXPR_F bool operator>=(const civil_time<T1>& lhs, |
||||
const civil_time<T2>& rhs) noexcept { |
||||
return !(lhs < rhs); |
||||
} |
||||
template <typename T1, typename T2> |
||||
CONSTEXPR_F bool operator>(const civil_time<T1>& lhs, |
||||
const civil_time<T2>& rhs) noexcept { |
||||
return rhs < lhs; |
||||
} |
||||
template <typename T1, typename T2> |
||||
CONSTEXPR_F bool operator==(const civil_time<T1>& lhs, |
||||
const civil_time<T2>& rhs) noexcept { |
||||
return lhs.year() == rhs.year() && lhs.month() == rhs.month() && |
||||
lhs.day() == rhs.day() && lhs.hour() == rhs.hour() && |
||||
lhs.minute() == rhs.minute() && lhs.second() == rhs.second(); |
||||
} |
||||
template <typename T1, typename T2> |
||||
CONSTEXPR_F bool operator!=(const civil_time<T1>& lhs, |
||||
const civil_time<T2>& rhs) noexcept { |
||||
return !(lhs == rhs); |
||||
} |
||||
|
||||
////////////////////////////////////////////////////////////////////////
|
||||
|
||||
enum class weekday { |
||||
monday, |
||||
tuesday, |
||||
wednesday, |
||||
thursday, |
||||
friday, |
||||
saturday, |
||||
sunday, |
||||
}; |
||||
|
||||
CONSTEXPR_F weekday get_weekday(const civil_day& cd) noexcept { |
||||
CONSTEXPR_D weekday k_weekday_by_sun_off[7] = { |
||||
weekday::sunday, weekday::monday, weekday::tuesday, |
||||
weekday::wednesday, weekday::thursday, weekday::friday, |
||||
weekday::saturday, |
||||
}; |
||||
CONSTEXPR_D int k_weekday_offsets[1 + 12] = { |
||||
-1, 0, 3, 2, 5, 0, 3, 5, 1, 4, 6, 2, 4, |
||||
}; |
||||
year_t wd = cd.year() - (cd.month() < 3); |
||||
if (wd >= 0) { |
||||
wd += wd / 4 - wd / 100 + wd / 400; |
||||
} else { |
||||
wd += (wd - 3) / 4 - (wd - 99) / 100 + (wd - 399) / 400; |
||||
} |
||||
wd += k_weekday_offsets[cd.month()] + cd.day(); |
||||
return k_weekday_by_sun_off[(wd % 7 + 7) % 7]; |
||||
} |
||||
|
||||
////////////////////////////////////////////////////////////////////////
|
||||
|
||||
CONSTEXPR_F civil_day next_weekday(civil_day cd, weekday wd) noexcept { |
||||
do { cd += 1; } while (get_weekday(cd) != wd); |
||||
return cd; |
||||
} |
||||
|
||||
CONSTEXPR_F civil_day prev_weekday(civil_day cd, weekday wd) noexcept { |
||||
do { cd -= 1; } while (get_weekday(cd) != wd); |
||||
return cd; |
||||
} |
||||
|
||||
CONSTEXPR_F int get_yearday(const civil_day& cd) noexcept { |
||||
CONSTEXPR_D int k_month_offsets[1 + 12] = { |
||||
-1, 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, |
||||
}; |
||||
const int feb29 = (cd.month() > 2 && impl::is_leap_year(cd.year())); |
||||
return k_month_offsets[cd.month()] + feb29 + cd.day(); |
||||
} |
||||
|
||||
////////////////////////////////////////////////////////////////////////
|
||||
|
||||
std::ostream& operator<<(std::ostream& os, const civil_year& y); |
||||
std::ostream& operator<<(std::ostream& os, const civil_month& m); |
||||
std::ostream& operator<<(std::ostream& os, const civil_day& d); |
||||
std::ostream& operator<<(std::ostream& os, const civil_hour& h); |
||||
std::ostream& operator<<(std::ostream& os, const civil_minute& m); |
||||
std::ostream& operator<<(std::ostream& os, const civil_second& s); |
||||
std::ostream& operator<<(std::ostream& os, weekday wd); |
||||
|
||||
} // namespace detail
|
||||
} // namespace cctz
|
||||
} // namespace time_internal
|
||||
} // namespace absl
|
||||
|
||||
#undef CONSTEXPR_M |
||||
#undef CONSTEXPR_F |
||||
#undef CONSTEXPR_D |
||||
|
||||
#endif // ABSL_TIME_INTERNAL_CCTZ_CIVIL_TIME_DETAIL_H_
|
||||
@ -0,0 +1,316 @@ |
||||
// 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
|
||||
//
|
||||
// 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.
|
||||
|
||||
// A library for translating between absolute times (represented by
|
||||
// std::chrono::time_points of the std::chrono::system_clock) and civil
|
||||
// times (represented by cctz::civil_second) using the rules defined by
|
||||
// a time zone (cctz::time_zone).
|
||||
|
||||
#ifndef ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_H_ |
||||
#define ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_H_ |
||||
|
||||
#include <chrono> |
||||
#include <cstdint> |
||||
#include <string> |
||||
#include <utility> |
||||
|
||||
#include "absl/time/internal/cctz/include/cctz/civil_time.h" |
||||
|
||||
namespace absl { |
||||
namespace time_internal { |
||||
namespace cctz { |
||||
|
||||
// Convenience aliases. Not intended as public API points.
|
||||
template <typename D> |
||||
using time_point = std::chrono::time_point<std::chrono::system_clock, D>; |
||||
using sys_seconds = std::chrono::duration<std::int_fast64_t>; |
||||
|
||||
namespace detail { |
||||
template <typename D> |
||||
inline std::pair<time_point<sys_seconds>, D> |
||||
split_seconds(const time_point<D>& tp) { |
||||
auto sec = std::chrono::time_point_cast<sys_seconds>(tp); |
||||
auto sub = tp - sec; |
||||
if (sub.count() < 0) { |
||||
sec -= sys_seconds(1); |
||||
sub += sys_seconds(1); |
||||
} |
||||
return {sec, std::chrono::duration_cast<D>(sub)}; |
||||
} |
||||
inline std::pair<time_point<sys_seconds>, sys_seconds> |
||||
split_seconds(const time_point<sys_seconds>& tp) { |
||||
return {tp, sys_seconds(0)}; |
||||
} |
||||
} // namespace detail
|
||||
|
||||
// cctz::time_zone is an opaque, small, value-type class representing a
|
||||
// geo-political region within which particular rules are used for mapping
|
||||
// between absolute and civil times. Time zones are named using the TZ
|
||||
// identifiers from the IANA Time Zone Database, such as "America/Los_Angeles"
|
||||
// or "Australia/Sydney". Time zones are created from factory functions such
|
||||
// as load_time_zone(). Note: strings like "PST" and "EDT" are not valid TZ
|
||||
// identifiers.
|
||||
//
|
||||
// Example:
|
||||
// cctz::time_zone utc = cctz::utc_time_zone();
|
||||
// cctz::time_zone pst = cctz::fixed_time_zone(std::chrono::hours(-8));
|
||||
// cctz::time_zone loc = cctz::local_time_zone();
|
||||
// cctz::time_zone lax;
|
||||
// if (!cctz::load_time_zone("America/Los_Angeles", &lax)) { ... }
|
||||
//
|
||||
// See also:
|
||||
// - http://www.iana.org/time-zones
|
||||
// - http://en.wikipedia.org/wiki/Zoneinfo
|
||||
class time_zone { |
||||
public: |
||||
time_zone() : time_zone(nullptr) {} // Equivalent to UTC
|
||||
time_zone(const time_zone&) = default; |
||||
time_zone& operator=(const time_zone&) = default; |
||||
|
||||
std::string name() const; |
||||
|
||||
// An absolute_lookup represents the civil time (cctz::civil_second) within
|
||||
// this time_zone at the given absolute time (time_point). There are
|
||||
// additionally a few other fields that may be useful when working with
|
||||
// older APIs, such as std::tm.
|
||||
//
|
||||
// Example:
|
||||
// const cctz::time_zone tz = ...
|
||||
// const auto tp = std::chrono::system_clock::now();
|
||||
// const cctz::time_zone::absolute_lookup al = tz.lookup(tp);
|
||||
struct absolute_lookup { |
||||
civil_second cs; |
||||
// Note: The following fields exist for backward compatibility with older
|
||||
// APIs. Accessing these fields directly is a sign of imprudent logic in
|
||||
// the calling code. Modern time-related code should only access this data
|
||||
// indirectly by way of cctz::format().
|
||||
int offset; // civil seconds east of UTC
|
||||
bool is_dst; // is offset non-standard?
|
||||
const char* abbr; // time-zone abbreviation (e.g., "PST")
|
||||
}; |
||||
absolute_lookup lookup(const time_point<sys_seconds>& tp) const; |
||||
template <typename D> |
||||
absolute_lookup lookup(const time_point<D>& tp) const { |
||||
return lookup(detail::split_seconds(tp).first); |
||||
} |
||||
|
||||
// A civil_lookup represents the absolute time(s) (time_point) that
|
||||
// correspond to the given civil time (cctz::civil_second) within this
|
||||
// time_zone. Usually the given civil time represents a unique instant
|
||||
// in time, in which case the conversion is unambiguous. However,
|
||||
// within this time zone, the given civil time may be skipped (e.g.,
|
||||
// during a positive UTC offset shift), or repeated (e.g., during a
|
||||
// negative UTC offset shift). To account for these possibilities,
|
||||
// civil_lookup is richer than just a single time_point.
|
||||
//
|
||||
// In all cases the civil_lookup::kind enum will indicate the nature
|
||||
// of the given civil-time argument, and the pre, trans, and post
|
||||
// members will give the absolute time answers using the pre-transition
|
||||
// offset, the transition point itself, and the post-transition offset,
|
||||
// respectively (all three times are equal if kind == UNIQUE). If any
|
||||
// of these three absolute times is outside the representable range of a
|
||||
// time_point<sys_seconds> the field is set to its maximum/minimum value.
|
||||
//
|
||||
// Example:
|
||||
// cctz::time_zone lax;
|
||||
// if (!cctz::load_time_zone("America/Los_Angeles", &lax)) { ... }
|
||||
//
|
||||
// // A unique civil time.
|
||||
// auto jan01 = lax.lookup(cctz::civil_second(2011, 1, 1, 0, 0, 0));
|
||||
// // jan01.kind == cctz::time_zone::civil_lookup::UNIQUE
|
||||
// // jan01.pre is 2011/01/01 00:00:00 -0800
|
||||
// // jan01.trans is 2011/01/01 00:00:00 -0800
|
||||
// // jan01.post is 2011/01/01 00:00:00 -0800
|
||||
//
|
||||
// // A Spring DST transition, when there is a gap in civil time.
|
||||
// auto mar13 = lax.lookup(cctz::civil_second(2011, 3, 13, 2, 15, 0));
|
||||
// // mar13.kind == cctz::time_zone::civil_lookup::SKIPPED
|
||||
// // mar13.pre is 2011/03/13 03:15:00 -0700
|
||||
// // mar13.trans is 2011/03/13 03:00:00 -0700
|
||||
// // mar13.post is 2011/03/13 01:15:00 -0800
|
||||
//
|
||||
// // A Fall DST transition, when civil times are repeated.
|
||||
// auto nov06 = lax.lookup(cctz::civil_second(2011, 11, 6, 1, 15, 0));
|
||||
// // nov06.kind == cctz::time_zone::civil_lookup::REPEATED
|
||||
// // nov06.pre is 2011/11/06 01:15:00 -0700
|
||||
// // nov06.trans is 2011/11/06 01:00:00 -0800
|
||||
// // nov06.post is 2011/11/06 01:15:00 -0800
|
||||
struct civil_lookup { |
||||
enum civil_kind { |
||||
UNIQUE, // the civil time was singular (pre == trans == post)
|
||||
SKIPPED, // the civil time did not exist (pre >= trans > post)
|
||||
REPEATED, // the civil time was ambiguous (pre < trans <= post)
|
||||
} kind; |
||||
time_point<sys_seconds> pre; // uses the pre-transition offset
|
||||
time_point<sys_seconds> trans; // instant of civil-offset change
|
||||
time_point<sys_seconds> post; // uses the post-transition offset
|
||||
}; |
||||
civil_lookup lookup(const civil_second& cs) const; |
||||
|
||||
class Impl; |
||||
|
||||
private: |
||||
explicit time_zone(const Impl* impl) : impl_(impl) {} |
||||
const Impl* impl_; |
||||
}; |
||||
|
||||
// Relational operators.
|
||||
bool operator==(time_zone lhs, time_zone rhs); |
||||
inline bool operator!=(time_zone lhs, time_zone rhs) { return !(lhs == rhs); } |
||||
|
||||
// Loads the named time zone. May perform I/O on the initial load.
|
||||
// If the name is invalid, or some other kind of error occurs, returns
|
||||
// false and "*tz" is set to the UTC time zone.
|
||||
bool load_time_zone(const std::string& name, time_zone* tz); |
||||
|
||||
// Returns a time_zone representing UTC. Cannot fail.
|
||||
time_zone utc_time_zone(); |
||||
|
||||
// Returns a time zone that is a fixed offset (seconds east) from UTC.
|
||||
// Note: If the absolute value of the offset is greater than 24 hours
|
||||
// you'll get UTC (i.e., zero offset) instead.
|
||||
time_zone fixed_time_zone(const sys_seconds& offset); |
||||
|
||||
// Returns a time zone representing the local time zone. Falls back to UTC.
|
||||
time_zone local_time_zone(); |
||||
|
||||
// Returns the civil time (cctz::civil_second) within the given time zone at
|
||||
// the given absolute time (time_point). Since the additional fields provided
|
||||
// by the time_zone::absolute_lookup struct should rarely be needed in modern
|
||||
// code, this convert() function is simpler and should be preferred.
|
||||
template <typename D> |
||||
inline civil_second convert(const time_point<D>& tp, const time_zone& tz) { |
||||
return tz.lookup(tp).cs; |
||||
} |
||||
|
||||
// Returns the absolute time (time_point) that corresponds to the given civil
|
||||
// time within the given time zone. If the civil time is not unique (i.e., if
|
||||
// it was either repeated or non-existent), then the returned time_point is
|
||||
// the best estimate that preserves relative order. That is, this function
|
||||
// guarantees that if cs1 < cs2, then convert(cs1, tz) <= convert(cs2, tz).
|
||||
inline time_point<sys_seconds> convert(const civil_second& cs, |
||||
const time_zone& tz) { |
||||
const time_zone::civil_lookup cl = tz.lookup(cs); |
||||
if (cl.kind == time_zone::civil_lookup::SKIPPED) return cl.trans; |
||||
return cl.pre; |
||||
} |
||||
|
||||
namespace detail { |
||||
using femtoseconds = std::chrono::duration<std::int_fast64_t, std::femto>; |
||||
std::string format(const std::string&, const time_point<sys_seconds>&, |
||||
const femtoseconds&, const time_zone&); |
||||
bool parse(const std::string&, const std::string&, const time_zone&, |
||||
time_point<sys_seconds>*, femtoseconds*, std::string* err = nullptr); |
||||
} // namespace detail
|
||||
|
||||
// Formats the given time_point in the given cctz::time_zone according to
|
||||
// the provided format std::string. Uses strftime()-like formatting options,
|
||||
// with the following extensions:
|
||||
//
|
||||
// - %Ez - RFC3339-compatible numeric UTC offset (+hh:mm or -hh:mm)
|
||||
// - %E*z - Full-resolution numeric UTC offset (+hh:mm:ss or -hh:mm:ss)
|
||||
// - %E#S - Seconds with # digits of fractional precision
|
||||
// - %E*S - Seconds with full fractional precision (a literal '*')
|
||||
// - %E#f - Fractional seconds with # digits of precision
|
||||
// - %E*f - Fractional seconds with full precision (a literal '*')
|
||||
// - %E4Y - Four-character years (-999 ... -001, 0000, 0001 ... 9999)
|
||||
//
|
||||
// Note that %E0S behaves like %S, and %E0f produces no characters. In
|
||||
// contrast %E*f always produces at least one digit, which may be '0'.
|
||||
//
|
||||
// Note that %Y produces as many characters as it takes to fully render the
|
||||
// year. A year outside of [-999:9999] when formatted with %E4Y will produce
|
||||
// more than four characters, just like %Y.
|
||||
//
|
||||
// Tip: Format strings should include the UTC offset (e.g., %z, %Ez, or %E*z)
|
||||
// so that the resulting std::string uniquely identifies an absolute time.
|
||||
//
|
||||
// Example:
|
||||
// cctz::time_zone lax;
|
||||
// if (!cctz::load_time_zone("America/Los_Angeles", &lax)) { ... }
|
||||
// auto tp = cctz::convert(cctz::civil_second(2013, 1, 2, 3, 4, 5), lax);
|
||||
// std::string f = cctz::format("%H:%M:%S", tp, lax); // "03:04:05"
|
||||
// f = cctz::format("%H:%M:%E3S", tp, lax); // "03:04:05.000"
|
||||
template <typename D> |
||||
inline std::string format(const std::string& fmt, const time_point<D>& tp, |
||||
const time_zone& tz) { |
||||
const auto p = detail::split_seconds(tp); |
||||
const auto n = std::chrono::duration_cast<detail::femtoseconds>(p.second); |
||||
return detail::format(fmt, p.first, n, tz); |
||||
} |
||||
|
||||
// Parses an input std::string according to the provided format std::string and
|
||||
// returns the corresponding time_point. Uses strftime()-like formatting
|
||||
// options, with the same extensions as cctz::format(), but with the
|
||||
// exceptions that %E#S is interpreted as %E*S, and %E#f as %E*f. %Ez
|
||||
// and %E*z also accept the same inputs.
|
||||
//
|
||||
// %Y consumes as many numeric characters as it can, so the matching data
|
||||
// should always be terminated with a non-numeric. %E4Y always consumes
|
||||
// exactly four characters, including any sign.
|
||||
//
|
||||
// Unspecified fields are taken from the default date and time of ...
|
||||
//
|
||||
// "1970-01-01 00:00:00.0 +0000"
|
||||
//
|
||||
// For example, parsing a std::string of "15:45" (%H:%M) will return a time_point
|
||||
// that represents "1970-01-01 15:45:00.0 +0000".
|
||||
//
|
||||
// Note that parse() returns time instants, so it makes most sense to parse
|
||||
// fully-specified date/time strings that include a UTC offset (%z, %Ez, or
|
||||
// %E*z).
|
||||
//
|
||||
// Note also that parse() only heeds the fields year, month, day, hour,
|
||||
// minute, (fractional) second, and UTC offset. Other fields, like weekday (%a
|
||||
// or %A), while parsed for syntactic validity, are ignored in the conversion.
|
||||
//
|
||||
// Date and time fields that are out-of-range will be treated as errors rather
|
||||
// than normalizing them like cctz::civil_second() would do. For example, it
|
||||
// is an error to parse the date "Oct 32, 2013" because 32 is out of range.
|
||||
//
|
||||
// A second of ":60" is normalized to ":00" of the following minute with
|
||||
// fractional seconds discarded. The following table shows how the given
|
||||
// seconds and subseconds will be parsed:
|
||||
//
|
||||
// "59.x" -> 59.x // exact
|
||||
// "60.x" -> 00.0 // normalized
|
||||
// "00.x" -> 00.x // exact
|
||||
//
|
||||
// Errors are indicated by returning false.
|
||||
//
|
||||
// Example:
|
||||
// const cctz::time_zone tz = ...
|
||||
// std::chrono::system_clock::time_point tp;
|
||||
// if (cctz::parse("%Y-%m-%d", "2015-10-09", tz, &tp)) {
|
||||
// ...
|
||||
// }
|
||||
template <typename D> |
||||
inline bool parse(const std::string& fmt, const std::string& input, |
||||
const time_zone& tz, time_point<D>* tpp) { |
||||
time_point<sys_seconds> sec; |
||||
detail::femtoseconds fs; |
||||
const bool b = detail::parse(fmt, input, tz, &sec, &fs); |
||||
if (b) { |
||||
// TODO: Return false if unrepresentable as a time_point<D>.
|
||||
*tpp = std::chrono::time_point_cast<D>(sec); |
||||
*tpp += std::chrono::duration_cast<D>(fs); |
||||
} |
||||
return b; |
||||
} |
||||
|
||||
} // namespace cctz
|
||||
} // namespace time_internal
|
||||
} // namespace absl
|
||||
|
||||
#endif // ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_H_
|
||||
@ -0,0 +1,91 @@ |
||||
// 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
|
||||
//
|
||||
// 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 ABSL_TIME_INTERNAL_CCTZ_ZONE_INFO_SOURCE_H_ |
||||
#define ABSL_TIME_INTERNAL_CCTZ_ZONE_INFO_SOURCE_H_ |
||||
|
||||
#include <cstddef> |
||||
#include <functional> |
||||
#include <memory> |
||||
#include <string> |
||||
|
||||
namespace absl { |
||||
namespace time_internal { |
||||
namespace cctz { |
||||
|
||||
// A stdio-like interface for providing zoneinfo data for a particular zone.
|
||||
class ZoneInfoSource { |
||||
public: |
||||
virtual ~ZoneInfoSource(); |
||||
|
||||
virtual std::size_t Read(void* ptr, std::size_t size) = 0; // like fread()
|
||||
virtual int Skip(std::size_t offset) = 0; // like fseek()
|
||||
}; |
||||
|
||||
} // namespace cctz
|
||||
} // namespace time_internal
|
||||
} // namespace absl
|
||||
|
||||
namespace absl { |
||||
namespace time_internal { |
||||
namespace cctz_extension { |
||||
|
||||
// A function-pointer type for a factory that returns a ZoneInfoSource
|
||||
// given the name of a time zone and a fallback factory. Returns null
|
||||
// when the data for the named zone cannot be found.
|
||||
using ZoneInfoSourceFactory = |
||||
std::unique_ptr<absl::time_internal::cctz::ZoneInfoSource> (*)( |
||||
const std::string&, |
||||
const std::function<std::unique_ptr<absl::time_internal::cctz::ZoneInfoSource>( |
||||
const std::string&)>&); |
||||
|
||||
// The user can control the mapping of zone names to zoneinfo data by
|
||||
// providing a definition for cctz_extension::zone_info_source_factory.
|
||||
// For example, given functions my_factory() and my_other_factory() that
|
||||
// can return a ZoneInfoSource for a named zone, we could inject them into
|
||||
// cctz::load_time_zone() with:
|
||||
//
|
||||
// namespace cctz_extension {
|
||||
// namespace {
|
||||
// std::unique_ptr<cctz::ZoneInfoSource> CustomFactory(
|
||||
// const std::string& name,
|
||||
// const std::function<std::unique_ptr<cctz::ZoneInfoSource>(
|
||||
// const std::string& name)>& fallback_factory) {
|
||||
// if (auto zip = my_factory(name)) return zip;
|
||||
// if (auto zip = fallback_factory(name)) return zip;
|
||||
// if (auto zip = my_other_factory(name)) return zip;
|
||||
// return nullptr;
|
||||
// }
|
||||
// } // namespace
|
||||
// ZoneInfoSourceFactory zone_info_source_factory = CustomFactory;
|
||||
// } // namespace cctz_extension
|
||||
//
|
||||
// This might be used, say, to use zoneinfo data embedded in the program,
|
||||
// or read from a (possibly compressed) file archive, or both.
|
||||
//
|
||||
// cctz_extension::zone_info_source_factory() will be called:
|
||||
// (1) from the same thread as the cctz::load_time_zone() call,
|
||||
// (2) only once for any zone name, and
|
||||
// (3) serially (i.e., no concurrent execution).
|
||||
//
|
||||
// The fallback factory obtains zoneinfo data by reading files in ${TZDIR},
|
||||
// and it is used automatically when no zone_info_source_factory definition
|
||||
// is linked into the program.
|
||||
extern ZoneInfoSourceFactory zone_info_source_factory; |
||||
|
||||
} // namespace cctz_extension
|
||||
} // namespace time_internal
|
||||
} // namespace absl
|
||||
|
||||
#endif // ABSL_TIME_INTERNAL_CCTZ_ZONE_INFO_SOURCE_H_
|
||||
@ -0,0 +1,90 @@ |
||||
// 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
|
||||
//
|
||||
// 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.
|
||||
|
||||
#include "absl/time/internal/cctz/include/cctz/civil_time_detail.h" |
||||
|
||||
#include <iomanip> |
||||
#include <ostream> |
||||
#include <sstream> |
||||
|
||||
namespace absl { |
||||
namespace time_internal { |
||||
namespace cctz { |
||||
namespace detail { |
||||
|
||||
// Output stream operators output a format matching YYYY-MM-DDThh:mm:ss,
|
||||
// while omitting fields inferior to the type's alignment. For example,
|
||||
// civil_day is formatted only as YYYY-MM-DD.
|
||||
std::ostream& operator<<(std::ostream& os, const civil_year& y) { |
||||
std::stringstream ss; |
||||
ss << y.year(); // No padding.
|
||||
return os << ss.str(); |
||||
} |
||||
std::ostream& operator<<(std::ostream& os, const civil_month& m) { |
||||
std::stringstream ss; |
||||
ss << civil_year(m) << '-'; |
||||
ss << std::setfill('0') << std::setw(2) << m.month(); |
||||
return os << ss.str(); |
||||
} |
||||
std::ostream& operator<<(std::ostream& os, const civil_day& d) { |
||||
std::stringstream ss; |
||||
ss << civil_month(d) << '-'; |
||||
ss << std::setfill('0') << std::setw(2) << d.day(); |
||||
return os << ss.str(); |
||||
} |
||||
std::ostream& operator<<(std::ostream& os, const civil_hour& h) { |
||||
std::stringstream ss; |
||||
ss << civil_day(h) << 'T'; |
||||
ss << std::setfill('0') << std::setw(2) << h.hour(); |
||||
return os << ss.str(); |
||||
} |
||||
std::ostream& operator<<(std::ostream& os, const civil_minute& m) { |
||||
std::stringstream ss; |
||||
ss << civil_hour(m) << ':'; |
||||
ss << std::setfill('0') << std::setw(2) << m.minute(); |
||||
return os << ss.str(); |
||||
} |
||||
std::ostream& operator<<(std::ostream& os, const civil_second& s) { |
||||
std::stringstream ss; |
||||
ss << civil_minute(s) << ':'; |
||||
ss << std::setfill('0') << std::setw(2) << s.second(); |
||||
return os << ss.str(); |
||||
} |
||||
|
||||
////////////////////////////////////////////////////////////////////////
|
||||
|
||||
std::ostream& operator<<(std::ostream& os, weekday wd) { |
||||
switch (wd) { |
||||
case weekday::monday: |
||||
return os << "Monday"; |
||||
case weekday::tuesday: |
||||
return os << "Tuesday"; |
||||
case weekday::wednesday: |
||||
return os << "Wednesday"; |
||||
case weekday::thursday: |
||||
return os << "Thursday"; |
||||
case weekday::friday: |
||||
return os << "Friday"; |
||||
case weekday::saturday: |
||||
return os << "Saturday"; |
||||
case weekday::sunday: |
||||
return os << "Sunday"; |
||||
} |
||||
return os; // Should never get here, but -Wreturn-type may warn without this.
|
||||
} |
||||
|
||||
} // namespace detail
|
||||
} // namespace cctz
|
||||
} // namespace time_internal
|
||||
} // namespace absl
|
||||
File diff suppressed because it is too large
Load Diff
@ -0,0 +1,133 @@ |
||||
// 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
|
||||
//
|
||||
// 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.
|
||||
|
||||
#include "time_zone_fixed.h" |
||||
|
||||
#include <algorithm> |
||||
#include <chrono> |
||||
#include <cstdio> |
||||
#include <cstring> |
||||
#include <string> |
||||
|
||||
namespace absl { |
||||
namespace time_internal { |
||||
namespace cctz { |
||||
|
||||
namespace { |
||||
|
||||
// The prefix used for the internal names of fixed-offset zones.
|
||||
const char kFixedOffsetPrefix[] = "Fixed/"; |
||||
|
||||
int Parse02d(const char* p) { |
||||
static const char kDigits[] = "0123456789"; |
||||
if (const char* ap = std::strchr(kDigits, *p)) { |
||||
int v = static_cast<int>(ap - kDigits); |
||||
if (const char* bp = std::strchr(kDigits, *++p)) { |
||||
return (v * 10) + static_cast<int>(bp - kDigits); |
||||
} |
||||
} |
||||
return -1; |
||||
} |
||||
|
||||
} // namespace
|
||||
|
||||
bool FixedOffsetFromName(const std::string& name, sys_seconds* offset) { |
||||
if (name.compare(0, std::string::npos, "UTC", 3) == 0) { |
||||
*offset = sys_seconds::zero(); |
||||
return true; |
||||
} |
||||
|
||||
const std::size_t prefix_len = sizeof(kFixedOffsetPrefix) - 1; |
||||
const char* const ep = kFixedOffsetPrefix + prefix_len; |
||||
if (name.size() != prefix_len + 12) // "<prefix>UTC+99:99:99"
|
||||
return false; |
||||
if (!std::equal(kFixedOffsetPrefix, ep, name.begin())) |
||||
return false; |
||||
const char* np = name.data() + prefix_len; |
||||
if (*np++ != 'U' || *np++ != 'T' || *np++ != 'C') |
||||
return false; |
||||
if (np[0] != '+' && np[0] != '-') |
||||
return false; |
||||
if (np[3] != ':' || np[6] != ':') // see note below about large offsets
|
||||
return false; |
||||
|
||||
int hours = Parse02d(np + 1); |
||||
if (hours == -1) return false; |
||||
int mins = Parse02d(np + 4); |
||||
if (mins == -1) return false; |
||||
int secs = Parse02d(np + 7); |
||||
if (secs == -1) return false; |
||||
|
||||
secs += ((hours * 60) + mins) * 60; |
||||
if (secs > 24 * 60 * 60) return false; // outside supported offset range
|
||||
*offset = sys_seconds(secs * (np[0] == '-' ? -1 : 1)); // "-" means west
|
||||
return true; |
||||
} |
||||
|
||||
std::string FixedOffsetToName(const sys_seconds& offset) { |
||||
if (offset == sys_seconds::zero()) return "UTC"; |
||||
if (offset < std::chrono::hours(-24) || offset > std::chrono::hours(24)) { |
||||
// We don't support fixed-offset zones more than 24 hours
|
||||
// away from UTC to avoid complications in rendering such
|
||||
// offsets and to (somewhat) limit the total number of zones.
|
||||
return "UTC"; |
||||
} |
||||
int seconds = static_cast<int>(offset.count()); |
||||
const char sign = (seconds < 0 ? '-' : '+'); |
||||
int minutes = seconds / 60; |
||||
seconds %= 60; |
||||
if (sign == '-') { |
||||
if (seconds > 0) { |
||||
seconds -= 60; |
||||
minutes += 1; |
||||
} |
||||
seconds = -seconds; |
||||
minutes = -minutes; |
||||
} |
||||
int hours = minutes / 60; |
||||
minutes %= 60; |
||||
char buf[sizeof(kFixedOffsetPrefix) + sizeof("UTC-24:00:00")]; |
||||
snprintf(buf, sizeof(buf), "%sUTC%c%02d:%02d:%02d", |
||||
kFixedOffsetPrefix, sign, hours, minutes, seconds); |
||||
return buf; |
||||
} |
||||
|
||||
std::string FixedOffsetToAbbr(const sys_seconds& offset) { |
||||
std::string abbr = FixedOffsetToName(offset); |
||||
const std::size_t prefix_len = sizeof(kFixedOffsetPrefix) - 1; |
||||
const char* const ep = kFixedOffsetPrefix + prefix_len; |
||||
if (abbr.size() >= prefix_len) { |
||||
if (std::equal(kFixedOffsetPrefix, ep, abbr.begin())) { |
||||
abbr.erase(0, prefix_len); |
||||
if (abbr.size() == 12) { // UTC+99:99:99
|
||||
abbr.erase(9, 1); // UTC+99:9999
|
||||
abbr.erase(6, 1); // UTC+999999
|
||||
if (abbr[8] == '0' && abbr[9] == '0') { // UTC+999900
|
||||
abbr.erase(8, 2); // UTC+9999
|
||||
if (abbr[6] == '0' && abbr[7] == '0') { // UTC+9900
|
||||
abbr.erase(6, 2); // UTC+99
|
||||
if (abbr[4] == '0') { // UTC+09
|
||||
abbr.erase(4, 1); // UTC+9
|
||||
} |
||||
} |
||||
} |
||||
} |
||||
} |
||||
} |
||||
return abbr; |
||||
} |
||||
|
||||
} // namespace cctz
|
||||
} // namespace time_internal
|
||||
} // namespace absl
|
||||
@ -0,0 +1,49 @@ |
||||
// 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
|
||||
//
|
||||
// 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 ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_FIXED_H_ |
||||
#define ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_FIXED_H_ |
||||
|
||||
#include <string> |
||||
|
||||
#include "absl/time/internal/cctz/include/cctz/time_zone.h" |
||||
|
||||
namespace absl { |
||||
namespace time_internal { |
||||
namespace cctz { |
||||
|
||||
// Helper functions for dealing with the names and abbreviations
|
||||
// of time zones that are a fixed offset (seconds east) from UTC.
|
||||
// FixedOffsetFromName() extracts the offset from a valid fixed-offset
|
||||
// name, while FixedOffsetToName() and FixedOffsetToAbbr() generate
|
||||
// the canonical zone name and abbreviation respectively for the given
|
||||
// offset.
|
||||
//
|
||||
// A fixed-offset name looks like "Fixed/UTC<+-><hours>:<mins>:<secs>".
|
||||
// Its abbreviation is of the form "UTC(<+->H?H(MM(SS)?)?)?" where the
|
||||
// optional pieces are omitted when their values are zero. (Note that
|
||||
// the sign is the opposite of that used in a POSIX TZ specification.)
|
||||
//
|
||||
// Note: FixedOffsetFromName() fails on syntax errors or when the parsed
|
||||
// offset exceeds 24 hours. FixedOffsetToName() and FixedOffsetToAbbr()
|
||||
// both produce "UTC" when the argument offset exceeds 24 hours.
|
||||
bool FixedOffsetFromName(const std::string& name, sys_seconds* offset); |
||||
std::string FixedOffsetToName(const sys_seconds& offset); |
||||
std::string FixedOffsetToAbbr(const sys_seconds& offset); |
||||
|
||||
} // namespace cctz
|
||||
} // namespace time_internal
|
||||
} // namespace absl
|
||||
|
||||
#endif // ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_FIXED_H_
|
||||
@ -0,0 +1,848 @@ |
||||
// 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
|
||||
//
|
||||
// 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.
|
||||
|
||||
#if !defined(HAS_STRPTIME) |
||||
# if !defined(_MSC_VER) |
||||
# define HAS_STRPTIME 1 // assume everyone has strptime() except windows
|
||||
# endif |
||||
#endif |
||||
|
||||
#include "absl/time/internal/cctz/include/cctz/time_zone.h" |
||||
|
||||
#include <cctype> |
||||
#include <chrono> |
||||
#include <cstddef> |
||||
#include <cstdint> |
||||
#include <cstring> |
||||
#include <ctime> |
||||
#include <limits> |
||||
#include <string> |
||||
#include <vector> |
||||
#if !HAS_STRPTIME |
||||
#include <iomanip> |
||||
#include <sstream> |
||||
#endif |
||||
|
||||
#include "absl/time/internal/cctz/include/cctz/civil_time.h" |
||||
#include "time_zone_if.h" |
||||
|
||||
namespace absl { |
||||
namespace time_internal { |
||||
namespace cctz { |
||||
namespace detail { |
||||
|
||||
namespace { |
||||
|
||||
#if !HAS_STRPTIME |
||||
// Build a strptime() using C++11's std::get_time().
|
||||
char* strptime(const char* s, const char* fmt, std::tm* tm) { |
||||
std::istringstream input(s); |
||||
input >> std::get_time(tm, fmt); |
||||
if (input.fail()) return nullptr; |
||||
return const_cast<char*>(s) + |
||||
(input.eof() ? strlen(s) : static_cast<std::size_t>(input.tellg())); |
||||
} |
||||
#endif |
||||
|
||||
std::tm ToTM(const time_zone::absolute_lookup& al) { |
||||
std::tm tm{}; |
||||
tm.tm_sec = al.cs.second(); |
||||
tm.tm_min = al.cs.minute(); |
||||
tm.tm_hour = al.cs.hour(); |
||||
tm.tm_mday = al.cs.day(); |
||||
tm.tm_mon = al.cs.month() - 1; |
||||
|
||||
// Saturate tm.tm_year is cases of over/underflow.
|
||||
if (al.cs.year() < std::numeric_limits<int>::min() + 1900) { |
||||
tm.tm_year = std::numeric_limits<int>::min(); |
||||
} else if (al.cs.year() - 1900 > std::numeric_limits<int>::max()) { |
||||
tm.tm_year = std::numeric_limits<int>::max(); |
||||
} else { |
||||
tm.tm_year = static_cast<int>(al.cs.year() - 1900); |
||||
} |
||||
|
||||
switch (get_weekday(civil_day(al.cs))) { |
||||
case weekday::sunday: |
||||
tm.tm_wday = 0; |
||||
break; |
||||
case weekday::monday: |
||||
tm.tm_wday = 1; |
||||
break; |
||||
case weekday::tuesday: |
||||
tm.tm_wday = 2; |
||||
break; |
||||
case weekday::wednesday: |
||||
tm.tm_wday = 3; |
||||
break; |
||||
case weekday::thursday: |
||||
tm.tm_wday = 4; |
||||
break; |
||||
case weekday::friday: |
||||
tm.tm_wday = 5; |
||||
break; |
||||
case weekday::saturday: |
||||
tm.tm_wday = 6; |
||||
break; |
||||
} |
||||
tm.tm_yday = get_yearday(civil_day(al.cs)) - 1; |
||||
tm.tm_isdst = al.is_dst ? 1 : 0; |
||||
return tm; |
||||
} |
||||
|
||||
const char kDigits[] = "0123456789"; |
||||
|
||||
// Formats a 64-bit integer in the given field width. Note that it is up
|
||||
// to the caller of Format64() [and Format02d()/FormatOffset()] to ensure
|
||||
// that there is sufficient space before ep to hold the conversion.
|
||||
char* Format64(char* ep, int width, std::int_fast64_t v) { |
||||
bool neg = false; |
||||
if (v < 0) { |
||||
--width; |
||||
neg = true; |
||||
if (v == std::numeric_limits<std::int_fast64_t>::min()) { |
||||
// Avoid negating minimum value.
|
||||
std::int_fast64_t last_digit = -(v % 10); |
||||
v /= 10; |
||||
if (last_digit < 0) { |
||||
++v; |
||||
last_digit += 10; |
||||
} |
||||
--width; |
||||
*--ep = kDigits[last_digit]; |
||||
} |
||||
v = -v; |
||||
} |
||||
do { |
||||
--width; |
||||
*--ep = kDigits[v % 10]; |
||||
} while (v /= 10); |
||||
while (--width >= 0) *--ep = '0'; // zero pad
|
||||
if (neg) *--ep = '-'; |
||||
return ep; |
||||
} |
||||
|
||||
// Formats [0 .. 99] as %02d.
|
||||
char* Format02d(char* ep, int v) { |
||||
*--ep = kDigits[v % 10]; |
||||
*--ep = kDigits[(v / 10) % 10]; |
||||
return ep; |
||||
} |
||||
|
||||
// Formats a UTC offset, like +00:00.
|
||||
char* FormatOffset(char* ep, int offset, const char* mode) { |
||||
char sign = '+'; |
||||
if (offset < 0) { |
||||
offset = -offset; // bounded by 24h so no overflow
|
||||
sign = '-'; |
||||
} |
||||
char sep = mode[0]; |
||||
if (sep != '\0' && mode[1] == '*') { |
||||
ep = Format02d(ep, offset % 60); |
||||
*--ep = sep; |
||||
} |
||||
int minutes = offset / 60; |
||||
ep = Format02d(ep, minutes % 60); |
||||
if (sep != '\0') *--ep = sep; |
||||
ep = Format02d(ep, minutes / 60); |
||||
*--ep = sign; |
||||
return ep; |
||||
} |
||||
|
||||
// Formats a std::tm using strftime(3).
|
||||
void FormatTM(std::string* out, const std::string& fmt, const std::tm& tm) { |
||||
// strftime(3) returns the number of characters placed in the output
|
||||
// array (which may be 0 characters). It also returns 0 to indicate
|
||||
// an error, like the array wasn't large enough. To accommodate this,
|
||||
// the following code grows the buffer size from 2x the format std::string
|
||||
// length up to 32x.
|
||||
for (std::size_t i = 2; i != 32; i *= 2) { |
||||
std::size_t buf_size = fmt.size() * i; |
||||
std::vector<char> buf(buf_size); |
||||
if (std::size_t len = strftime(&buf[0], buf_size, fmt.c_str(), &tm)) { |
||||
out->append(&buf[0], len); |
||||
return; |
||||
} |
||||
} |
||||
} |
||||
|
||||
// Used for %E#S/%E#f specifiers and for data values in parse().
|
||||
template <typename T> |
||||
const char* ParseInt(const char* dp, int width, T min, T max, T* vp) { |
||||
if (dp != nullptr) { |
||||
const T kmin = std::numeric_limits<T>::min(); |
||||
bool erange = false; |
||||
bool neg = false; |
||||
T value = 0; |
||||
if (*dp == '-') { |
||||
neg = true; |
||||
if (width <= 0 || --width != 0) { |
||||
++dp; |
||||
} else { |
||||
dp = nullptr; // width was 1
|
||||
} |
||||
} |
||||
if (const char* const bp = dp) { |
||||
while (const char* cp = strchr(kDigits, *dp)) { |
||||
int d = static_cast<int>(cp - kDigits); |
||||
if (d >= 10) break; |
||||
if (value < kmin / 10) { |
||||
erange = true; |
||||
break; |
||||
} |
||||
value *= 10; |
||||
if (value < kmin + d) { |
||||
erange = true; |
||||
break; |
||||
} |
||||
value -= d; |
||||
dp += 1; |
||||
if (width > 0 && --width == 0) break; |
||||
} |
||||
if (dp != bp && !erange && (neg || value != kmin)) { |
||||
if (!neg || value != 0) { |
||||
if (!neg) value = -value; // make positive
|
||||
if (min <= value && value <= max) { |
||||
*vp = value; |
||||
} else { |
||||
dp = nullptr; |
||||
} |
||||
} else { |
||||
dp = nullptr; |
||||
} |
||||
} else { |
||||
dp = nullptr; |
||||
} |
||||
} |
||||
} |
||||
return dp; |
||||
} |
||||
|
||||
// The number of base-10 digits that can be represented by a signed 64-bit
|
||||
// integer. That is, 10^kDigits10_64 <= 2^63 - 1 < 10^(kDigits10_64 + 1).
|
||||
const int kDigits10_64 = 18; |
||||
|
||||
// 10^n for everything that can be represented by a signed 64-bit integer.
|
||||
const std::int_fast64_t kExp10[kDigits10_64 + 1] = { |
||||
1, |
||||
10, |
||||
100, |
||||
1000, |
||||
10000, |
||||
100000, |
||||
1000000, |
||||
10000000, |
||||
100000000, |
||||
1000000000, |
||||
10000000000, |
||||
100000000000, |
||||
1000000000000, |
||||
10000000000000, |
||||
100000000000000, |
||||
1000000000000000, |
||||
10000000000000000, |
||||
100000000000000000, |
||||
1000000000000000000, |
||||
}; |
||||
|
||||
} // namespace
|
||||
|
||||
// Uses strftime(3) to format the given Time. The following extended format
|
||||
// specifiers are also supported:
|
||||
//
|
||||
// - %Ez - RFC3339-compatible numeric UTC offset (+hh:mm or -hh:mm)
|
||||
// - %E*z - Full-resolution numeric UTC offset (+hh:mm:ss or -hh:mm:ss)
|
||||
// - %E#S - Seconds with # digits of fractional precision
|
||||
// - %E*S - Seconds with full fractional precision (a literal '*')
|
||||
// - %E4Y - Four-character years (-999 ... -001, 0000, 0001 ... 9999)
|
||||
//
|
||||
// The standard specifiers from RFC3339_* (%Y, %m, %d, %H, %M, and %S) are
|
||||
// handled internally for performance reasons. strftime(3) is slow due to
|
||||
// a POSIX requirement to respect changes to ${TZ}.
|
||||
//
|
||||
// The TZ/GNU %s extension is handled internally because strftime() has
|
||||
// to use mktime() to generate it, and that assumes the local time zone.
|
||||
//
|
||||
// We also handle the %z and %Z specifiers to accommodate platforms that do
|
||||
// not support the tm_gmtoff and tm_zone extensions to std::tm.
|
||||
//
|
||||
// Requires that zero() <= fs < seconds(1).
|
||||
std::string format(const std::string& format, const time_point<sys_seconds>& tp, |
||||
const detail::femtoseconds& fs, const time_zone& tz) { |
||||
std::string result; |
||||
result.reserve(format.size()); // A reasonable guess for the result size.
|
||||
const time_zone::absolute_lookup al = tz.lookup(tp); |
||||
const std::tm tm = ToTM(al); |
||||
|
||||
// Scratch buffer for internal conversions.
|
||||
char buf[3 + kDigits10_64]; // enough for longest conversion
|
||||
char* const ep = buf + sizeof(buf); |
||||
char* bp; // works back from ep
|
||||
|
||||
// Maintain three, disjoint subsequences that span format.
|
||||
// [format.begin() ... pending) : already formatted into result
|
||||
// [pending ... cur) : formatting pending, but no special cases
|
||||
// [cur ... format.end()) : unexamined
|
||||
// Initially, everything is in the unexamined part.
|
||||
const char* pending = format.c_str(); // NUL terminated
|
||||
const char* cur = pending; |
||||
const char* end = pending + format.length(); |
||||
|
||||
while (cur != end) { // while something is unexamined
|
||||
// Moves cur to the next percent sign.
|
||||
const char* start = cur; |
||||
while (cur != end && *cur != '%') ++cur; |
||||
|
||||
// If the new pending text is all ordinary, copy it out.
|
||||
if (cur != start && pending == start) { |
||||
result.append(pending, static_cast<std::size_t>(cur - pending)); |
||||
pending = start = cur; |
||||
} |
||||
|
||||
// Span the sequential percent signs.
|
||||
const char* percent = cur; |
||||
while (cur != end && *cur == '%') ++cur; |
||||
|
||||
// If the new pending text is all percents, copy out one
|
||||
// percent for every matched pair, then skip those pairs.
|
||||
if (cur != start && pending == start) { |
||||
std::size_t escaped = static_cast<std::size_t>(cur - pending) / 2; |
||||
result.append(pending, escaped); |
||||
pending += escaped * 2; |
||||
// Also copy out a single trailing percent.
|
||||
if (pending != cur && cur == end) { |
||||
result.push_back(*pending++); |
||||
} |
||||
} |
||||
|
||||
// Loop unless we have an unescaped percent.
|
||||
if (cur == end || (cur - percent) % 2 == 0) continue; |
||||
|
||||
// Simple specifiers that we handle ourselves.
|
||||
if (strchr("YmdeHMSzZs%", *cur)) { |
||||
if (cur - 1 != pending) { |
||||
FormatTM(&result, std::string(pending, cur - 1), tm); |
||||
} |
||||
switch (*cur) { |
||||
case 'Y': |
||||
// This avoids the tm.tm_year overflow problem for %Y, however
|
||||
// tm.tm_year will still be used by other specifiers like %D.
|
||||
bp = Format64(ep, 0, al.cs.year()); |
||||
result.append(bp, static_cast<std::size_t>(ep - bp)); |
||||
break; |
||||
case 'm': |
||||
bp = Format02d(ep, al.cs.month()); |
||||
result.append(bp, static_cast<std::size_t>(ep - bp)); |
||||
break; |
||||
case 'd': |
||||
case 'e': |
||||
bp = Format02d(ep, al.cs.day()); |
||||
if (*cur == 'e' && *bp == '0') *bp = ' '; // for Windows
|
||||
result.append(bp, static_cast<std::size_t>(ep - bp)); |
||||
break; |
||||
case 'H': |
||||
bp = Format02d(ep, al.cs.hour()); |
||||
result.append(bp, static_cast<std::size_t>(ep - bp)); |
||||
break; |
||||
case 'M': |
||||
bp = Format02d(ep, al.cs.minute()); |
||||
result.append(bp, static_cast<std::size_t>(ep - bp)); |
||||
break; |
||||
case 'S': |
||||
bp = Format02d(ep, al.cs.second()); |
||||
result.append(bp, static_cast<std::size_t>(ep - bp)); |
||||
break; |
||||
case 'z': |
||||
bp = FormatOffset(ep, al.offset, ""); |
||||
result.append(bp, static_cast<std::size_t>(ep - bp)); |
||||
break; |
||||
case 'Z': |
||||
result.append(al.abbr); |
||||
break; |
||||
case 's': |
||||
bp = Format64(ep, 0, ToUnixSeconds(tp)); |
||||
result.append(bp, static_cast<std::size_t>(ep - bp)); |
||||
break; |
||||
case '%': |
||||
result.push_back('%'); |
||||
break; |
||||
} |
||||
pending = ++cur; |
||||
continue; |
||||
} |
||||
|
||||
// Loop if there is no E modifier.
|
||||
if (*cur != 'E' || ++cur == end) continue; |
||||
|
||||
// Format our extensions.
|
||||
if (*cur == 'z') { |
||||
// Formats %Ez.
|
||||
if (cur - 2 != pending) { |
||||
FormatTM(&result, std::string(pending, cur - 2), tm); |
||||
} |
||||
bp = FormatOffset(ep, al.offset, ":"); |
||||
result.append(bp, static_cast<std::size_t>(ep - bp)); |
||||
pending = ++cur; |
||||
} else if (*cur == '*' && cur + 1 != end && *(cur + 1) == 'z') { |
||||
// Formats %E*z.
|
||||
if (cur - 2 != pending) { |
||||
FormatTM(&result, std::string(pending, cur - 2), tm); |
||||
} |
||||
bp = FormatOffset(ep, al.offset, ":*"); |
||||
result.append(bp, static_cast<std::size_t>(ep - bp)); |
||||
pending = cur += 2; |
||||
} else if (*cur == '*' && cur + 1 != end && |
||||
(*(cur + 1) == 'S' || *(cur + 1) == 'f')) { |
||||
// Formats %E*S or %E*F.
|
||||
if (cur - 2 != pending) { |
||||
FormatTM(&result, std::string(pending, cur - 2), tm); |
||||
} |
||||
char* cp = ep; |
||||
bp = Format64(cp, 15, fs.count()); |
||||
while (cp != bp && cp[-1] == '0') --cp; |
||||
switch (*(cur + 1)) { |
||||
case 'S': |
||||
if (cp != bp) *--bp = '.'; |
||||
bp = Format02d(bp, al.cs.second()); |
||||
break; |
||||
case 'f': |
||||
if (cp == bp) *--bp = '0'; |
||||
break; |
||||
} |
||||
result.append(bp, static_cast<std::size_t>(cp - bp)); |
||||
pending = cur += 2; |
||||
} else if (*cur == '4' && cur + 1 != end && *(cur + 1) == 'Y') { |
||||
// Formats %E4Y.
|
||||
if (cur - 2 != pending) { |
||||
FormatTM(&result, std::string(pending, cur - 2), tm); |
||||
} |
||||
bp = Format64(ep, 4, al.cs.year()); |
||||
result.append(bp, static_cast<std::size_t>(ep - bp)); |
||||
pending = cur += 2; |
||||
} else if (std::isdigit(*cur)) { |
||||
// Possibly found %E#S or %E#f.
|
||||
int n = 0; |
||||
if (const char* np = ParseInt(cur, 0, 0, 1024, &n)) { |
||||
if (*np == 'S' || *np == 'f') { |
||||
// Formats %E#S or %E#f.
|
||||
if (cur - 2 != pending) { |
||||
FormatTM(&result, std::string(pending, cur - 2), tm); |
||||
} |
||||
bp = ep; |
||||
if (n > 0) { |
||||
if (n > kDigits10_64) n = kDigits10_64; |
||||
bp = Format64(bp, n, (n > 15) ? fs.count() * kExp10[n - 15] |
||||
: fs.count() / kExp10[15 - n]); |
||||
if (*np == 'S') *--bp = '.'; |
||||
} |
||||
if (*np == 'S') bp = Format02d(bp, al.cs.second()); |
||||
result.append(bp, static_cast<std::size_t>(ep - bp)); |
||||
pending = cur = ++np; |
||||
} |
||||
} |
||||
} |
||||
} |
||||
|
||||
// Formats any remaining data.
|
||||
if (end != pending) { |
||||
FormatTM(&result, std::string(pending, end), tm); |
||||
} |
||||
|
||||
return result; |
||||
} |
||||
|
||||
namespace { |
||||
|
||||
const char* ParseOffset(const char* dp, const char* mode, int* offset) { |
||||
if (dp != nullptr) { |
||||
const char first = *dp++; |
||||
if (first == '+' || first == '-') { |
||||
char sep = mode[0]; |
||||
int hours = 0; |
||||
int minutes = 0; |
||||
int seconds = 0; |
||||
const char* ap = ParseInt(dp, 2, 0, 23, &hours); |
||||
if (ap != nullptr && ap - dp == 2) { |
||||
dp = ap; |
||||
if (sep != '\0' && *ap == sep) ++ap; |
||||
const char* bp = ParseInt(ap, 2, 0, 59, &minutes); |
||||
if (bp != nullptr && bp - ap == 2) { |
||||
dp = bp; |
||||
if (sep != '\0' && *bp == sep) ++bp; |
||||
const char* cp = ParseInt(bp, 2, 0, 59, &seconds); |
||||
if (cp != nullptr && cp - bp == 2) dp = cp; |
||||
} |
||||
*offset = ((hours * 60 + minutes) * 60) + seconds; |
||||
if (first == '-') *offset = -*offset; |
||||
} else { |
||||
dp = nullptr; |
||||
} |
||||
} else if (first == 'Z') { // Zulu
|
||||
*offset = 0; |
||||
} else { |
||||
dp = nullptr; |
||||
} |
||||
} |
||||
return dp; |
||||
} |
||||
|
||||
const char* ParseZone(const char* dp, std::string* zone) { |
||||
zone->clear(); |
||||
if (dp != nullptr) { |
||||
while (*dp != '\0' && !std::isspace(*dp)) zone->push_back(*dp++); |
||||
if (zone->empty()) dp = nullptr; |
||||
} |
||||
return dp; |
||||
} |
||||
|
||||
const char* ParseSubSeconds(const char* dp, detail::femtoseconds* subseconds) { |
||||
if (dp != nullptr) { |
||||
std::int_fast64_t v = 0; |
||||
std::int_fast64_t exp = 0; |
||||
const char* const bp = dp; |
||||
while (const char* cp = strchr(kDigits, *dp)) { |
||||
int d = static_cast<int>(cp - kDigits); |
||||
if (d >= 10) break; |
||||
if (exp < 15) { |
||||
exp += 1; |
||||
v *= 10; |
||||
v += d; |
||||
} |
||||
++dp; |
||||
} |
||||
if (dp != bp) { |
||||
v *= kExp10[15 - exp]; |
||||
*subseconds = detail::femtoseconds(v); |
||||
} else { |
||||
dp = nullptr; |
||||
} |
||||
} |
||||
return dp; |
||||
} |
||||
|
||||
// Parses a std::string into a std::tm using strptime(3).
|
||||
const char* ParseTM(const char* dp, const char* fmt, std::tm* tm) { |
||||
if (dp != nullptr) { |
||||
dp = strptime(dp, fmt, tm); |
||||
} |
||||
return dp; |
||||
} |
||||
|
||||
} // namespace
|
||||
|
||||
// Uses strptime(3) to parse the given input. Supports the same extended
|
||||
// format specifiers as format(), although %E#S and %E*S are treated
|
||||
// identically (and similarly for %E#f and %E*f). %Ez and %E*z also accept
|
||||
// the same inputs.
|
||||
//
|
||||
// The standard specifiers from RFC3339_* (%Y, %m, %d, %H, %M, and %S) are
|
||||
// handled internally so that we can normally avoid strptime() altogether
|
||||
// (which is particularly helpful when the native implementation is broken).
|
||||
//
|
||||
// The TZ/GNU %s extension is handled internally because strptime() has to
|
||||
// use localtime_r() to generate it, and that assumes the local time zone.
|
||||
//
|
||||
// We also handle the %z specifier to accommodate platforms that do not
|
||||
// support the tm_gmtoff extension to std::tm. %Z is parsed but ignored.
|
||||
bool parse(const std::string& format, const std::string& input, |
||||
const time_zone& tz, time_point<sys_seconds>* sec, |
||||
detail::femtoseconds* fs, std::string* err) { |
||||
// The unparsed input.
|
||||
const char* data = input.c_str(); // NUL terminated
|
||||
|
||||
// Skips leading whitespace.
|
||||
while (std::isspace(*data)) ++data; |
||||
|
||||
const year_t kyearmax = std::numeric_limits<year_t>::max(); |
||||
const year_t kyearmin = std::numeric_limits<year_t>::min(); |
||||
|
||||
// Sets default values for unspecified fields.
|
||||
bool saw_year = false; |
||||
year_t year = 1970; |
||||
std::tm tm{}; |
||||
tm.tm_year = 1970 - 1900; |
||||
tm.tm_mon = 1 - 1; // Jan
|
||||
tm.tm_mday = 1; |
||||
tm.tm_hour = 0; |
||||
tm.tm_min = 0; |
||||
tm.tm_sec = 0; |
||||
tm.tm_wday = 4; // Thu
|
||||
tm.tm_yday = 0; |
||||
tm.tm_isdst = 0; |
||||
auto subseconds = detail::femtoseconds::zero(); |
||||
bool saw_offset = false; |
||||
int offset = 0; // No offset from passed tz.
|
||||
std::string zone = "UTC"; |
||||
|
||||
const char* fmt = format.c_str(); // NUL terminated
|
||||
bool twelve_hour = false; |
||||
bool afternoon = false; |
||||
|
||||
bool saw_percent_s = false; |
||||
std::int_fast64_t percent_s = 0; |
||||
|
||||
// Steps through format, one specifier at a time.
|
||||
while (data != nullptr && *fmt != '\0') { |
||||
if (std::isspace(*fmt)) { |
||||
while (std::isspace(*data)) ++data; |
||||
while (std::isspace(*++fmt)) continue; |
||||
continue; |
||||
} |
||||
|
||||
if (*fmt != '%') { |
||||
if (*data == *fmt) { |
||||
++data; |
||||
++fmt; |
||||
} else { |
||||
data = nullptr; |
||||
} |
||||
continue; |
||||
} |
||||
|
||||
const char* percent = fmt; |
||||
if (*++fmt == '\0') { |
||||
data = nullptr; |
||||
continue; |
||||
} |
||||
switch (*fmt++) { |
||||
case 'Y': |
||||
// Symmetrically with FormatTime(), directly handing %Y avoids the
|
||||
// tm.tm_year overflow problem. However, tm.tm_year will still be
|
||||
// used by other specifiers like %D.
|
||||
data = ParseInt(data, 0, kyearmin, kyearmax, &year); |
||||
if (data != nullptr) saw_year = true; |
||||
continue; |
||||
case 'm': |
||||
data = ParseInt(data, 2, 1, 12, &tm.tm_mon); |
||||
if (data != nullptr) tm.tm_mon -= 1; |
||||
continue; |
||||
case 'd': |
||||
case 'e': |
||||
data = ParseInt(data, 2, 1, 31, &tm.tm_mday); |
||||
continue; |
||||
case 'H': |
||||
data = ParseInt(data, 2, 0, 23, &tm.tm_hour); |
||||
twelve_hour = false; |
||||
continue; |
||||
case 'M': |
||||
data = ParseInt(data, 2, 0, 59, &tm.tm_min); |
||||
continue; |
||||
case 'S': |
||||
data = ParseInt(data, 2, 0, 60, &tm.tm_sec); |
||||
continue; |
||||
case 'I': |
||||
case 'l': |
||||
case 'r': // probably uses %I
|
||||
twelve_hour = true; |
||||
break; |
||||
case 'R': // uses %H
|
||||
case 'T': // uses %H
|
||||
case 'c': // probably uses %H
|
||||
case 'X': // probably uses %H
|
||||
twelve_hour = false; |
||||
break; |
||||
case 'z': |
||||
data = ParseOffset(data, "", &offset); |
||||
if (data != nullptr) saw_offset = true; |
||||
continue; |
||||
case 'Z': // ignored; zone abbreviations are ambiguous
|
||||
data = ParseZone(data, &zone); |
||||
continue; |
||||
case 's': |
||||
data = ParseInt(data, 0, |
||||
std::numeric_limits<std::int_fast64_t>::min(), |
||||
std::numeric_limits<std::int_fast64_t>::max(), |
||||
&percent_s); |
||||
if (data != nullptr) saw_percent_s = true; |
||||
continue; |
||||
case '%': |
||||
data = (*data == '%' ? data + 1 : nullptr); |
||||
continue; |
||||
case 'E': |
||||
if (*fmt == 'z' || (*fmt == '*' && *(fmt + 1) == 'z')) { |
||||
data = ParseOffset(data, ":", &offset); |
||||
if (data != nullptr) saw_offset = true; |
||||
fmt += (*fmt == 'z') ? 1 : 2; |
||||
continue; |
||||
} |
||||
if (*fmt == '*' && *(fmt + 1) == 'S') { |
||||
data = ParseInt(data, 2, 0, 60, &tm.tm_sec); |
||||
if (data != nullptr && *data == '.') { |
||||
data = ParseSubSeconds(data + 1, &subseconds); |
||||
} |
||||
fmt += 2; |
||||
continue; |
||||
} |
||||
if (*fmt == '*' && *(fmt + 1) == 'f') { |
||||
if (data != nullptr && std::isdigit(*data)) { |
||||
data = ParseSubSeconds(data, &subseconds); |
||||
} |
||||
fmt += 2; |
||||
continue; |
||||
} |
||||
if (*fmt == '4' && *(fmt + 1) == 'Y') { |
||||
const char* bp = data; |
||||
data = ParseInt(data, 4, year_t{-999}, year_t{9999}, &year); |
||||
if (data != nullptr) { |
||||
if (data - bp == 4) { |
||||
saw_year = true; |
||||
} else { |
||||
data = nullptr; // stopped too soon
|
||||
} |
||||
} |
||||
fmt += 2; |
||||
continue; |
||||
} |
||||
if (std::isdigit(*fmt)) { |
||||
int n = 0; // value ignored
|
||||
if (const char* np = ParseInt(fmt, 0, 0, 1024, &n)) { |
||||
if (*np == 'S') { |
||||
data = ParseInt(data, 2, 0, 60, &tm.tm_sec); |
||||
if (data != nullptr && *data == '.') { |
||||
data = ParseSubSeconds(data + 1, &subseconds); |
||||
} |
||||
fmt = ++np; |
||||
continue; |
||||
} |
||||
if (*np == 'f') { |
||||
if (data != nullptr && std::isdigit(*data)) { |
||||
data = ParseSubSeconds(data, &subseconds); |
||||
} |
||||
fmt = ++np; |
||||
continue; |
||||
} |
||||
} |
||||
} |
||||
if (*fmt == 'c') twelve_hour = false; // probably uses %H
|
||||
if (*fmt == 'X') twelve_hour = false; // probably uses %H
|
||||
if (*fmt != '\0') ++fmt; |
||||
break; |
||||
case 'O': |
||||
if (*fmt == 'H') twelve_hour = false; |
||||
if (*fmt == 'I') twelve_hour = true; |
||||
if (*fmt != '\0') ++fmt; |
||||
break; |
||||
} |
||||
|
||||
// Parses the current specifier.
|
||||
const char* orig_data = data; |
||||
std::string spec(percent, static_cast<std::size_t>(fmt - percent)); |
||||
data = ParseTM(data, spec.c_str(), &tm); |
||||
|
||||
// If we successfully parsed %p we need to remember whether the result
|
||||
// was AM or PM so that we can adjust tm_hour before ConvertDateTime().
|
||||
// So reparse the input with a known AM hour, and check if it is shifted
|
||||
// to a PM hour.
|
||||
if (spec == "%p" && data != nullptr) { |
||||
std::string test_input = "1"; |
||||
test_input.append(orig_data, static_cast<std::size_t>(data - orig_data)); |
||||
const char* test_data = test_input.c_str(); |
||||
std::tm tmp{}; |
||||
ParseTM(test_data, "%I%p", &tmp); |
||||
afternoon = (tmp.tm_hour == 13); |
||||
} |
||||
} |
||||
|
||||
// Adjust a 12-hour tm_hour value if it should be in the afternoon.
|
||||
if (twelve_hour && afternoon && tm.tm_hour < 12) { |
||||
tm.tm_hour += 12; |
||||
} |
||||
|
||||
if (data == nullptr) { |
||||
if (err != nullptr) *err = "Failed to parse input"; |
||||
return false; |
||||
} |
||||
|
||||
// Skip any remaining whitespace.
|
||||
while (std::isspace(*data)) ++data; |
||||
|
||||
// parse() must consume the entire input std::string.
|
||||
if (*data != '\0') { |
||||
if (err != nullptr) *err = "Illegal trailing data in input string"; |
||||
return false; |
||||
} |
||||
|
||||
// If we saw %s then we ignore anything else and return that time.
|
||||
if (saw_percent_s) { |
||||
*sec = FromUnixSeconds(percent_s); |
||||
*fs = detail::femtoseconds::zero(); |
||||
return true; |
||||
} |
||||
|
||||
// If we saw %z, %Ez, or %E*z then we want to interpret the parsed fields
|
||||
// in UTC and then shift by that offset. Otherwise we want to interpret
|
||||
// the fields directly in the passed time_zone.
|
||||
time_zone ptz = saw_offset ? utc_time_zone() : tz; |
||||
|
||||
// Allows a leap second of 60 to normalize forward to the following ":00".
|
||||
if (tm.tm_sec == 60) { |
||||
tm.tm_sec -= 1; |
||||
offset -= 1; |
||||
subseconds = detail::femtoseconds::zero(); |
||||
} |
||||
|
||||
if (!saw_year) { |
||||
year = year_t{tm.tm_year}; |
||||
if (year > kyearmax - 1900) { |
||||
// Platform-dependent, maybe unreachable.
|
||||
if (err != nullptr) *err = "Out-of-range year"; |
||||
return false; |
||||
} |
||||
year += 1900; |
||||
} |
||||
|
||||
const int month = tm.tm_mon + 1; |
||||
civil_second cs(year, month, tm.tm_mday, tm.tm_hour, tm.tm_min, tm.tm_sec); |
||||
|
||||
// parse() should not allow normalization. Due to the restricted field
|
||||
// ranges above (see ParseInt()), the only possibility is for days to roll
|
||||
// into months. That is, parsing "Sep 31" should not produce "Oct 1".
|
||||
if (cs.month() != month || cs.day() != tm.tm_mday) { |
||||
if (err != nullptr) *err = "Out-of-range field"; |
||||
return false; |
||||
} |
||||
|
||||
// Accounts for the offset adjustment before converting to absolute time.
|
||||
if ((offset < 0 && cs > civil_second::max() + offset) || |
||||
(offset > 0 && cs < civil_second::min() + offset)) { |
||||
if (err != nullptr) *err = "Out-of-range field"; |
||||
return false; |
||||
} |
||||
cs -= offset; |
||||
|
||||
const auto tp = ptz.lookup(cs).pre; |
||||
// Checks for overflow/underflow and returns an error as necessary.
|
||||
if (tp == time_point<sys_seconds>::max()) { |
||||
const auto al = ptz.lookup(time_point<sys_seconds>::max()); |
||||
if (cs > al.cs) { |
||||
if (err != nullptr) *err = "Out-of-range field"; |
||||
return false; |
||||
} |
||||
} |
||||
if (tp == time_point<sys_seconds>::min()) { |
||||
const auto al = ptz.lookup(time_point<sys_seconds>::min()); |
||||
if (cs < al.cs) { |
||||
if (err != nullptr) *err = "Out-of-range field"; |
||||
return false; |
||||
} |
||||
} |
||||
|
||||
*sec = tp; |
||||
*fs = subseconds; |
||||
return true; |
||||
} |
||||
|
||||
} // namespace detail
|
||||
} // namespace cctz
|
||||
} // namespace time_internal
|
||||
} // namespace absl
|
||||
File diff suppressed because it is too large
Load Diff
@ -0,0 +1,41 @@ |
||||
// 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
|
||||
//
|
||||
// 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.
|
||||
|
||||
#include "time_zone_if.h" |
||||
#include "time_zone_info.h" |
||||
#include "time_zone_libc.h" |
||||
|
||||
namespace absl { |
||||
namespace time_internal { |
||||
namespace cctz { |
||||
|
||||
std::unique_ptr<TimeZoneIf> TimeZoneIf::Load(const std::string& name) { |
||||
// Support "libc:localtime" and "libc:*" to access the legacy
|
||||
// localtime and UTC support respectively from the C library.
|
||||
if (name.compare(0, 5, "libc:") == 0) { |
||||
return std::unique_ptr<TimeZoneIf>(new TimeZoneLibC(name.substr(5))); |
||||
} |
||||
|
||||
// Otherwise use the "zoneinfo" implementation by default.
|
||||
std::unique_ptr<TimeZoneInfo> tz(new TimeZoneInfo); |
||||
if (!tz->Load(name)) tz.reset(); |
||||
return std::unique_ptr<TimeZoneIf>(tz.release()); |
||||
} |
||||
|
||||
// Defined out-of-line to avoid emitting a weak vtable in all TUs.
|
||||
TimeZoneIf::~TimeZoneIf() {} |
||||
|
||||
} // namespace cctz
|
||||
} // namespace time_internal
|
||||
} // namespace absl
|
||||
@ -0,0 +1,70 @@ |
||||
// 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
|
||||
//
|
||||
// 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 ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_IF_H_ |
||||
#define ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_IF_H_ |
||||
|
||||
#include <chrono> |
||||
#include <cstdint> |
||||
#include <memory> |
||||
#include <string> |
||||
|
||||
#include "absl/time/internal/cctz/include/cctz/civil_time.h" |
||||
#include "absl/time/internal/cctz/include/cctz/time_zone.h" |
||||
|
||||
namespace absl { |
||||
namespace time_internal { |
||||
namespace cctz { |
||||
|
||||
// A simple interface used to hide time-zone complexities from time_zone::Impl.
|
||||
// Subclasses implement the functions for civil-time conversions in the zone.
|
||||
class TimeZoneIf { |
||||
public: |
||||
// A factory function for TimeZoneIf implementations.
|
||||
static std::unique_ptr<TimeZoneIf> Load(const std::string& name); |
||||
|
||||
virtual ~TimeZoneIf(); |
||||
|
||||
virtual time_zone::absolute_lookup BreakTime( |
||||
const time_point<sys_seconds>& tp) const = 0; |
||||
virtual time_zone::civil_lookup MakeTime( |
||||
const civil_second& cs) const = 0; |
||||
|
||||
virtual std::string Description() const = 0; |
||||
virtual bool NextTransition(time_point<sys_seconds>* tp) const = 0; |
||||
virtual bool PrevTransition(time_point<sys_seconds>* tp) const = 0; |
||||
|
||||
protected: |
||||
TimeZoneIf() {} |
||||
}; |
||||
|
||||
// Convert between time_point<sys_seconds> and a count of seconds since
|
||||
// the Unix epoch. We assume that the std::chrono::system_clock and the
|
||||
// Unix clock are second aligned, but not that they share an epoch.
|
||||
inline std::int_fast64_t ToUnixSeconds(const time_point<sys_seconds>& tp) { |
||||
return (tp - std::chrono::time_point_cast<sys_seconds>( |
||||
std::chrono::system_clock::from_time_t(0))) |
||||
.count(); |
||||
} |
||||
inline time_point<sys_seconds> FromUnixSeconds(std::int_fast64_t t) { |
||||
return std::chrono::time_point_cast<sys_seconds>( |
||||
std::chrono::system_clock::from_time_t(0)) + |
||||
sys_seconds(t); |
||||
} |
||||
|
||||
} // namespace cctz
|
||||
} // namespace time_internal
|
||||
} // namespace absl
|
||||
|
||||
#endif // ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_IF_H_
|
||||
@ -0,0 +1,117 @@ |
||||
// 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
|
||||
//
|
||||
// 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.
|
||||
|
||||
#include "time_zone_impl.h" |
||||
|
||||
#include <mutex> |
||||
#include <string> |
||||
#include <unordered_map> |
||||
#include <utility> |
||||
|
||||
#include "time_zone_fixed.h" |
||||
|
||||
namespace absl { |
||||
namespace time_internal { |
||||
namespace cctz { |
||||
|
||||
namespace { |
||||
|
||||
// time_zone::Impls are linked into a map to support fast lookup by name.
|
||||
using TimeZoneImplByName = |
||||
std::unordered_map<std::string, const time_zone::Impl*>; |
||||
TimeZoneImplByName* time_zone_map = nullptr; |
||||
|
||||
// Mutual exclusion for time_zone_map.
|
||||
std::mutex time_zone_mutex; |
||||
|
||||
} // namespace
|
||||
|
||||
time_zone time_zone::Impl::UTC() { |
||||
return time_zone(UTCImpl()); |
||||
} |
||||
|
||||
bool time_zone::Impl::LoadTimeZone(const std::string& name, time_zone* tz) { |
||||
const time_zone::Impl* const utc_impl = UTCImpl(); |
||||
|
||||
// First check for UTC (which is never a key in time_zone_map).
|
||||
auto offset = sys_seconds::zero(); |
||||
if (FixedOffsetFromName(name, &offset) && offset == sys_seconds::zero()) { |
||||
*tz = time_zone(utc_impl); |
||||
return true; |
||||
} |
||||
|
||||
// Then check, under a shared lock, whether the time zone has already
|
||||
// been loaded. This is the common path. TODO: Move to shared_mutex.
|
||||
{ |
||||
std::lock_guard<std::mutex> lock(time_zone_mutex); |
||||
if (time_zone_map != nullptr) { |
||||
TimeZoneImplByName::const_iterator itr = time_zone_map->find(name); |
||||
if (itr != time_zone_map->end()) { |
||||
*tz = time_zone(itr->second); |
||||
return itr->second != utc_impl; |
||||
} |
||||
} |
||||
} |
||||
|
||||
// Now check again, under an exclusive lock.
|
||||
std::lock_guard<std::mutex> lock(time_zone_mutex); |
||||
if (time_zone_map == nullptr) time_zone_map = new TimeZoneImplByName; |
||||
const Impl*& impl = (*time_zone_map)[name]; |
||||
if (impl == nullptr) { |
||||
// The first thread in loads the new time zone.
|
||||
Impl* new_impl = new Impl(name); |
||||
new_impl->zone_ = TimeZoneIf::Load(new_impl->name_); |
||||
if (new_impl->zone_ == nullptr) { |
||||
delete new_impl; // free the nascent Impl
|
||||
impl = utc_impl; // and fallback to UTC
|
||||
} else { |
||||
impl = new_impl; // install new time zone
|
||||
} |
||||
} |
||||
*tz = time_zone(impl); |
||||
return impl != utc_impl; |
||||
} |
||||
|
||||
const time_zone::Impl& time_zone::Impl::get(const time_zone& tz) { |
||||
if (tz.impl_ == nullptr) { |
||||
// Dereferencing an implicit-UTC time_zone is expected to be
|
||||
// rare, so we don't mind paying a small synchronization cost.
|
||||
return *UTCImpl(); |
||||
} |
||||
return *tz.impl_; |
||||
} |
||||
|
||||
void time_zone::Impl::ClearTimeZoneMapTestOnly() { |
||||
std::lock_guard<std::mutex> lock(time_zone_mutex); |
||||
if (time_zone_map != nullptr) { |
||||
// Existing time_zone::Impl* entries are in the wild, so we simply
|
||||
// leak them. Future requests will result in reloading the data.
|
||||
time_zone_map->clear(); |
||||
} |
||||
} |
||||
|
||||
time_zone::Impl::Impl(const std::string& name) : name_(name) {} |
||||
|
||||
const time_zone::Impl* time_zone::Impl::UTCImpl() { |
||||
static Impl* utc_impl = [] { |
||||
Impl* impl = new Impl("UTC"); |
||||
impl->zone_ = TimeZoneIf::Load(impl->name_); // never fails
|
||||
return impl; |
||||
}(); |
||||
return utc_impl; |
||||
} |
||||
|
||||
} // namespace cctz
|
||||
} // namespace time_internal
|
||||
} // namespace absl
|
||||
@ -0,0 +1,97 @@ |
||||
// 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
|
||||
//
|
||||
// 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 ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_IMPL_H_ |
||||
#define ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_IMPL_H_ |
||||
|
||||
#include <memory> |
||||
#include <string> |
||||
|
||||
#include "absl/time/internal/cctz/include/cctz/civil_time.h" |
||||
#include "absl/time/internal/cctz/include/cctz/time_zone.h" |
||||
#include "time_zone_if.h" |
||||
#include "time_zone_info.h" |
||||
|
||||
namespace absl { |
||||
namespace time_internal { |
||||
namespace cctz { |
||||
|
||||
// time_zone::Impl is the internal object referenced by a cctz::time_zone.
|
||||
class time_zone::Impl { |
||||
public: |
||||
// The UTC time zone. Also used for other time zones that fail to load.
|
||||
static time_zone UTC(); |
||||
|
||||
// Load a named time zone. Returns false if the name is invalid, or if
|
||||
// some other kind of error occurs. Note that loading "UTC" never fails.
|
||||
static bool LoadTimeZone(const std::string& name, time_zone* tz); |
||||
|
||||
// Dereferences the time_zone to obtain its Impl.
|
||||
static const time_zone::Impl& get(const time_zone& tz); |
||||
|
||||
// Clears the map of cached time zones. Primarily for use in benchmarks
|
||||
// that gauge the performance of loading/parsing the time-zone data.
|
||||
static void ClearTimeZoneMapTestOnly(); |
||||
|
||||
// The primary key is the time-zone ID (e.g., "America/New_York").
|
||||
const std::string& name() const { return name_; } |
||||
|
||||
// Breaks a time_point down to civil-time components in this time zone.
|
||||
time_zone::absolute_lookup BreakTime( |
||||
const time_point<sys_seconds>& tp) const { |
||||
return zone_->BreakTime(tp); |
||||
} |
||||
|
||||
// Converts the civil-time components in this time zone into a time_point.
|
||||
// That is, the opposite of BreakTime(). The requested civil time may be
|
||||
// ambiguous or illegal due to a change of UTC offset.
|
||||
time_zone::civil_lookup MakeTime(const civil_second& cs) const { |
||||
return zone_->MakeTime(cs); |
||||
} |
||||
|
||||
// Returns an implementation-specific description of this time zone.
|
||||
std::string Description() const { return zone_->Description(); } |
||||
|
||||
// Finds the time of the next/previous offset change in this time zone.
|
||||
//
|
||||
// By definition, NextTransition(&tp) returns false when tp has its
|
||||
// maximum value, and PrevTransition(&tp) returns false when tp has its
|
||||
// mimimum value. If the zone has no transitions, the result will also
|
||||
// be false no matter what the argument.
|
||||
//
|
||||
// Otherwise, when tp has its mimimum value, NextTransition(&tp) returns
|
||||
// true and sets tp to the first recorded transition. Chains of calls
|
||||
// to NextTransition()/PrevTransition() will eventually return false,
|
||||
// but it is unspecified exactly when NextTransition(&tp) jumps to false,
|
||||
// or what time is set by PrevTransition(&tp) for a very distant tp.
|
||||
bool NextTransition(time_point<sys_seconds>* tp) const { |
||||
return zone_->NextTransition(tp); |
||||
} |
||||
bool PrevTransition(time_point<sys_seconds>* tp) const { |
||||
return zone_->PrevTransition(tp); |
||||
} |
||||
|
||||
private: |
||||
explicit Impl(const std::string& name); |
||||
static const Impl* UTCImpl(); |
||||
|
||||
const std::string name_; |
||||
std::unique_ptr<TimeZoneIf> zone_; |
||||
}; |
||||
|
||||
} // namespace cctz
|
||||
} // namespace time_internal
|
||||
} // namespace absl
|
||||
|
||||
#endif // ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_IMPL_H_
|
||||
@ -0,0 +1,956 @@ |
||||
// 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
|
||||
//
|
||||
// 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.
|
||||
|
||||
// This file implements the TimeZoneIf interface using the "zoneinfo"
|
||||
// data provided by the IANA Time Zone Database (i.e., the only real game
|
||||
// in town).
|
||||
//
|
||||
// TimeZoneInfo represents the history of UTC-offset changes within a time
|
||||
// zone. Most changes are due to daylight-saving rules, but occasionally
|
||||
// shifts are made to the time-zone's base offset. The database only attempts
|
||||
// to be definitive for times since 1970, so be wary of local-time conversions
|
||||
// before that. Also, rule and zone-boundary changes are made at the whim
|
||||
// of governments, so the conversion of future times needs to be taken with
|
||||
// a grain of salt.
|
||||
//
|
||||
// For more information see tzfile(5), http://www.iana.org/time-zones, or
|
||||
// http://en.wikipedia.org/wiki/Zoneinfo.
|
||||
//
|
||||
// Note that we assume the proleptic Gregorian calendar and 60-second
|
||||
// minutes throughout.
|
||||
|
||||
#include "time_zone_info.h" |
||||
|
||||
#include <algorithm> |
||||
#include <cassert> |
||||
#include <chrono> |
||||
#include <cstdint> |
||||
#include <cstdio> |
||||
#include <cstdlib> |
||||
#include <cstring> |
||||
#include <functional> |
||||
#include <iostream> |
||||
#include <memory> |
||||
#include <sstream> |
||||
#include <string> |
||||
|
||||
#include "absl/time/internal/cctz/include/cctz/civil_time.h" |
||||
#include "time_zone_fixed.h" |
||||
#include "time_zone_posix.h" |
||||
|
||||
namespace absl { |
||||
namespace time_internal { |
||||
namespace cctz { |
||||
|
||||
namespace { |
||||
|
||||
inline bool IsLeap(year_t year) { |
||||
return (year % 4) == 0 && ((year % 100) != 0 || (year % 400) == 0); |
||||
} |
||||
|
||||
// The number of days in non-leap and leap years respectively.
|
||||
const std::int_least32_t kDaysPerYear[2] = {365, 366}; |
||||
|
||||
// The day offsets of the beginning of each (1-based) month in non-leap and
|
||||
// leap years respectively (e.g., 335 days before December in a leap year).
|
||||
const std::int_least16_t kMonthOffsets[2][1 + 12 + 1] = { |
||||
{-1, 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365}, |
||||
{-1, 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366}, |
||||
}; |
||||
|
||||
// We reject leap-second encoded zoneinfo and so assume 60-second minutes.
|
||||
const std::int_least32_t kSecsPerDay = 24 * 60 * 60; |
||||
|
||||
// 400-year chunks always have 146097 days (20871 weeks).
|
||||
const std::int_least64_t kSecsPer400Years = 146097LL * kSecsPerDay; |
||||
|
||||
// Like kDaysPerYear[] but scaled up by a factor of kSecsPerDay.
|
||||
const std::int_least32_t kSecsPerYear[2] = { |
||||
365 * kSecsPerDay, |
||||
366 * kSecsPerDay, |
||||
}; |
||||
|
||||
// Single-byte, unsigned numeric values are encoded directly.
|
||||
inline std::uint_fast8_t Decode8(const char* cp) { |
||||
return static_cast<std::uint_fast8_t>(*cp) & 0xff; |
||||
} |
||||
|
||||
// Multi-byte, numeric values are encoded using a MSB first,
|
||||
// twos-complement representation. These helpers decode, from
|
||||
// the given address, 4-byte and 8-byte values respectively.
|
||||
// Note: If int_fastXX_t == intXX_t and this machine is not
|
||||
// twos complement, then there will be at least one input value
|
||||
// we cannot represent.
|
||||
std::int_fast32_t Decode32(const char* cp) { |
||||
std::uint_fast32_t v = 0; |
||||
for (int i = 0; i != (32 / 8); ++i) v = (v << 8) | Decode8(cp++); |
||||
const std::int_fast32_t s32max = 0x7fffffff; |
||||
const auto s32maxU = static_cast<std::uint_fast32_t>(s32max); |
||||
if (v <= s32maxU) return static_cast<std::int_fast32_t>(v); |
||||
return static_cast<std::int_fast32_t>(v - s32maxU - 1) - s32max - 1; |
||||
} |
||||
|
||||
std::int_fast64_t Decode64(const char* cp) { |
||||
std::uint_fast64_t v = 0; |
||||
for (int i = 0; i != (64 / 8); ++i) v = (v << 8) | Decode8(cp++); |
||||
const std::int_fast64_t s64max = 0x7fffffffffffffff; |
||||
const auto s64maxU = static_cast<std::uint_fast64_t>(s64max); |
||||
if (v <= s64maxU) return static_cast<std::int_fast64_t>(v); |
||||
return static_cast<std::int_fast64_t>(v - s64maxU - 1) - s64max - 1; |
||||
} |
||||
|
||||
// Generate a year-relative offset for a PosixTransition.
|
||||
std::int_fast64_t TransOffset(bool leap_year, int jan1_weekday, |
||||
const PosixTransition& pt) { |
||||
std::int_fast64_t days = 0; |
||||
switch (pt.date.fmt) { |
||||
case PosixTransition::J: { |
||||
days = pt.date.j.day; |
||||
if (!leap_year || days < kMonthOffsets[1][3]) days -= 1; |
||||
break; |
||||
} |
||||
case PosixTransition::N: { |
||||
days = pt.date.n.day; |
||||
break; |
||||
} |
||||
case PosixTransition::M: { |
||||
const bool last_week = (pt.date.m.week == 5); |
||||
days = kMonthOffsets[leap_year][pt.date.m.month + last_week]; |
||||
const std::int_fast64_t weekday = (jan1_weekday + days) % 7; |
||||
if (last_week) { |
||||
days -= (weekday + 7 - 1 - pt.date.m.weekday) % 7 + 1; |
||||
} else { |
||||
days += (pt.date.m.weekday + 7 - weekday) % 7; |
||||
days += (pt.date.m.week - 1) * 7; |
||||
} |
||||
break; |
||||
} |
||||
} |
||||
return (days * kSecsPerDay) + pt.time.offset; |
||||
} |
||||
|
||||
inline time_zone::civil_lookup MakeUnique(const time_point<sys_seconds>& tp) { |
||||
time_zone::civil_lookup cl; |
||||
cl.kind = time_zone::civil_lookup::UNIQUE; |
||||
cl.pre = cl.trans = cl.post = tp; |
||||
return cl; |
||||
} |
||||
|
||||
inline time_zone::civil_lookup MakeUnique(std::int_fast64_t unix_time) { |
||||
return MakeUnique(FromUnixSeconds(unix_time)); |
||||
} |
||||
|
||||
inline time_zone::civil_lookup MakeSkipped(const Transition& tr, |
||||
const civil_second& cs) { |
||||
time_zone::civil_lookup cl; |
||||
cl.kind = time_zone::civil_lookup::SKIPPED; |
||||
cl.pre = FromUnixSeconds(tr.unix_time - 1 + (cs - tr.prev_civil_sec)); |
||||
cl.trans = FromUnixSeconds(tr.unix_time); |
||||
cl.post = FromUnixSeconds(tr.unix_time - (tr.civil_sec - cs)); |
||||
return cl; |
||||
} |
||||
|
||||
inline time_zone::civil_lookup MakeRepeated(const Transition& tr, |
||||
const civil_second& cs) { |
||||
time_zone::civil_lookup cl; |
||||
cl.kind = time_zone::civil_lookup::REPEATED; |
||||
cl.pre = FromUnixSeconds(tr.unix_time - 1 - (tr.prev_civil_sec - cs)); |
||||
cl.trans = FromUnixSeconds(tr.unix_time); |
||||
cl.post = FromUnixSeconds(tr.unix_time + (cs - tr.civil_sec)); |
||||
return cl; |
||||
} |
||||
|
||||
inline civil_second YearShift(const civil_second& cs, year_t shift) { |
||||
return civil_second(cs.year() + shift, cs.month(), cs.day(), |
||||
cs.hour(), cs.minute(), cs.second()); |
||||
} |
||||
|
||||
} // namespace
|
||||
|
||||
// What (no leap-seconds) UTC+seconds zoneinfo would look like.
|
||||
bool TimeZoneInfo::ResetToBuiltinUTC(const sys_seconds& offset) { |
||||
transition_types_.resize(1); |
||||
TransitionType& tt(transition_types_.back()); |
||||
tt.utc_offset = static_cast<std::int_least32_t>(offset.count()); |
||||
tt.is_dst = false; |
||||
tt.abbr_index = 0; |
||||
|
||||
// We temporarily add some redundant, contemporary (2012 through 2021)
|
||||
// transitions for performance reasons. See TimeZoneInfo::LocalTime().
|
||||
// TODO: Fix the performance issue and remove the extra transitions.
|
||||
transitions_.clear(); |
||||
transitions_.reserve(12); |
||||
for (const std::int_fast64_t unix_time : { |
||||
-(1LL << 59), // BIG_BANG
|
||||
1325376000LL, // 2012-01-01T00:00:00+00:00
|
||||
1356998400LL, // 2013-01-01T00:00:00+00:00
|
||||
1388534400LL, // 2014-01-01T00:00:00+00:00
|
||||
1420070400LL, // 2015-01-01T00:00:00+00:00
|
||||
1451606400LL, // 2016-01-01T00:00:00+00:00
|
||||
1483228800LL, // 2017-01-01T00:00:00+00:00
|
||||
1514764800LL, // 2018-01-01T00:00:00+00:00
|
||||
1546300800LL, // 2019-01-01T00:00:00+00:00
|
||||
1577836800LL, // 2020-01-01T00:00:00+00:00
|
||||
1609459200LL, // 2021-01-01T00:00:00+00:00
|
||||
2147483647LL, // 2^31 - 1
|
||||
}) { |
||||
Transition& tr(*transitions_.emplace(transitions_.end())); |
||||
tr.unix_time = unix_time; |
||||
tr.type_index = 0; |
||||
tr.civil_sec = LocalTime(tr.unix_time, tt).cs; |
||||
tr.prev_civil_sec = tr.civil_sec - 1; |
||||
} |
||||
|
||||
default_transition_type_ = 0; |
||||
abbreviations_ = FixedOffsetToAbbr(offset); |
||||
abbreviations_.append(1, '\0'); // add NUL
|
||||
future_spec_.clear(); // never needed for a fixed-offset zone
|
||||
extended_ = false; |
||||
|
||||
tt.civil_max = LocalTime(sys_seconds::max().count(), tt).cs; |
||||
tt.civil_min = LocalTime(sys_seconds::min().count(), tt).cs; |
||||
|
||||
transitions_.shrink_to_fit(); |
||||
return true; |
||||
} |
||||
|
||||
// Builds the in-memory header using the raw bytes from the file.
|
||||
bool TimeZoneInfo::Header::Build(const tzhead& tzh) { |
||||
std::int_fast32_t v; |
||||
if ((v = Decode32(tzh.tzh_timecnt)) < 0) return false; |
||||
timecnt = static_cast<std::size_t>(v); |
||||
if ((v = Decode32(tzh.tzh_typecnt)) < 0) return false; |
||||
typecnt = static_cast<std::size_t>(v); |
||||
if ((v = Decode32(tzh.tzh_charcnt)) < 0) return false; |
||||
charcnt = static_cast<std::size_t>(v); |
||||
if ((v = Decode32(tzh.tzh_leapcnt)) < 0) return false; |
||||
leapcnt = static_cast<std::size_t>(v); |
||||
if ((v = Decode32(tzh.tzh_ttisstdcnt)) < 0) return false; |
||||
ttisstdcnt = static_cast<std::size_t>(v); |
||||
if ((v = Decode32(tzh.tzh_ttisgmtcnt)) < 0) return false; |
||||
ttisgmtcnt = static_cast<std::size_t>(v); |
||||
return true; |
||||
} |
||||
|
||||
// How many bytes of data are associated with this header. The result
|
||||
// depends upon whether this is a section with 4-byte or 8-byte times.
|
||||
std::size_t TimeZoneInfo::Header::DataLength(std::size_t time_len) const { |
||||
std::size_t len = 0; |
||||
len += (time_len + 1) * timecnt; // unix_time + type_index
|
||||
len += (4 + 1 + 1) * typecnt; // utc_offset + is_dst + abbr_index
|
||||
len += 1 * charcnt; // abbreviations
|
||||
len += (time_len + 4) * leapcnt; // leap-time + TAI-UTC
|
||||
len += 1 * ttisstdcnt; // UTC/local indicators
|
||||
len += 1 * ttisgmtcnt; // standard/wall indicators
|
||||
return len; |
||||
} |
||||
|
||||
// Check that the TransitionType has the expected offset/is_dst/abbreviation.
|
||||
void TimeZoneInfo::CheckTransition(const std::string& name, |
||||
const TransitionType& tt, |
||||
std::int_fast32_t offset, bool is_dst, |
||||
const std::string& abbr) const { |
||||
if (tt.utc_offset != offset || tt.is_dst != is_dst || |
||||
&abbreviations_[tt.abbr_index] != abbr) { |
||||
std::clog << name << ": Transition" |
||||
<< " offset=" << tt.utc_offset << "/" |
||||
<< (tt.is_dst ? "DST" : "STD") |
||||
<< "/abbr=" << &abbreviations_[tt.abbr_index] |
||||
<< " does not match POSIX spec '" << future_spec_ << "'\n"; |
||||
} |
||||
} |
||||
|
||||
// zic(8) can generate no-op transitions when a zone changes rules at an
|
||||
// instant when there is actually no discontinuity. So we check whether
|
||||
// two transitions have equivalent types (same offset/is_dst/abbr).
|
||||
bool TimeZoneInfo::EquivTransitions(std::uint_fast8_t tt1_index, |
||||
std::uint_fast8_t tt2_index) const { |
||||
if (tt1_index == tt2_index) return true; |
||||
const TransitionType& tt1(transition_types_[tt1_index]); |
||||
const TransitionType& tt2(transition_types_[tt2_index]); |
||||
if (tt1.is_dst != tt2.is_dst) return false; |
||||
if (tt1.utc_offset != tt2.utc_offset) return false; |
||||
if (tt1.abbr_index != tt2.abbr_index) return false; |
||||
return true; |
||||
} |
||||
|
||||
// Use the POSIX-TZ-environment-variable-style std::string to handle times
|
||||
// in years after the last transition stored in the zoneinfo data.
|
||||
void TimeZoneInfo::ExtendTransitions(const std::string& name, |
||||
const Header& hdr) { |
||||
extended_ = false; |
||||
bool extending = !future_spec_.empty(); |
||||
|
||||
PosixTimeZone posix; |
||||
if (extending && !ParsePosixSpec(future_spec_, &posix)) { |
||||
std::clog << name << ": Failed to parse '" << future_spec_ << "'\n"; |
||||
extending = false; |
||||
} |
||||
|
||||
if (extending && posix.dst_abbr.empty()) { // std only
|
||||
// The future specification should match the last/default transition,
|
||||
// and that means that handling the future will fall out naturally.
|
||||
std::uint_fast8_t index = default_transition_type_; |
||||
if (hdr.timecnt != 0) index = transitions_[hdr.timecnt - 1].type_index; |
||||
const TransitionType& tt(transition_types_[index]); |
||||
CheckTransition(name, tt, posix.std_offset, false, posix.std_abbr); |
||||
extending = false; |
||||
} |
||||
|
||||
if (extending && hdr.timecnt < 2) { |
||||
std::clog << name << ": Too few transitions for POSIX spec\n"; |
||||
extending = false; |
||||
} |
||||
|
||||
if (!extending) { |
||||
// Ensure that there is always a transition in the second half of the
|
||||
// time line (the BIG_BANG transition is in the first half) so that the
|
||||
// signed difference between a civil_second and the civil_second of its
|
||||
// previous transition is always representable, without overflow.
|
||||
const Transition& last(transitions_.back()); |
||||
if (last.unix_time < 0) { |
||||
const std::uint_fast8_t type_index = last.type_index; |
||||
Transition& tr(*transitions_.emplace(transitions_.end())); |
||||
tr.unix_time = 2147483647; // 2038-01-19T03:14:07+00:00
|
||||
tr.type_index = type_index; |
||||
} |
||||
return; // last transition wins
|
||||
} |
||||
|
||||
// Extend the transitions for an additional 400 years using the
|
||||
// future specification. Years beyond those can be handled by
|
||||
// mapping back to a cycle-equivalent year within that range.
|
||||
// zic(8) should probably do this so that we don't have to.
|
||||
// TODO: Reduce the extension by the number of compatible
|
||||
// transitions already in place.
|
||||
transitions_.reserve(hdr.timecnt + 400 * 2 + 1); |
||||
transitions_.resize(hdr.timecnt + 400 * 2); |
||||
extended_ = true; |
||||
|
||||
// The future specification should match the last two transitions,
|
||||
// and those transitions should have different is_dst flags. Note
|
||||
// that nothing says the UTC offset used by the is_dst transition
|
||||
// must be greater than that used by the !is_dst transition. (See
|
||||
// Europe/Dublin, for example.)
|
||||
const Transition* tr0 = &transitions_[hdr.timecnt - 1]; |
||||
const Transition* tr1 = &transitions_[hdr.timecnt - 2]; |
||||
const TransitionType* tt0 = &transition_types_[tr0->type_index]; |
||||
const TransitionType* tt1 = &transition_types_[tr1->type_index]; |
||||
const TransitionType& dst(tt0->is_dst ? *tt0 : *tt1); |
||||
const TransitionType& std(tt0->is_dst ? *tt1 : *tt0); |
||||
CheckTransition(name, dst, posix.dst_offset, true, posix.dst_abbr); |
||||
CheckTransition(name, std, posix.std_offset, false, posix.std_abbr); |
||||
|
||||
// Add the transitions to tr1 and back to tr0 for each extra year.
|
||||
last_year_ = LocalTime(tr0->unix_time, *tt0).cs.year(); |
||||
bool leap_year = IsLeap(last_year_); |
||||
const civil_day jan1(last_year_, 1, 1); |
||||
std::int_fast64_t jan1_time = civil_second(jan1) - civil_second(); |
||||
int jan1_weekday = (static_cast<int>(get_weekday(jan1)) + 1) % 7; |
||||
Transition* tr = &transitions_[hdr.timecnt]; // next trans to fill
|
||||
if (LocalTime(tr1->unix_time, *tt1).cs.year() != last_year_) { |
||||
// Add a single extra transition to align to a calendar year.
|
||||
transitions_.resize(transitions_.size() + 1); |
||||
assert(tr == &transitions_[hdr.timecnt]); // no reallocation
|
||||
const PosixTransition& pt1(tt0->is_dst ? posix.dst_end : posix.dst_start); |
||||
std::int_fast64_t tr1_offset = TransOffset(leap_year, jan1_weekday, pt1); |
||||
tr->unix_time = jan1_time + tr1_offset - tt0->utc_offset; |
||||
tr++->type_index = tr1->type_index; |
||||
tr0 = &transitions_[hdr.timecnt]; |
||||
tr1 = &transitions_[hdr.timecnt - 1]; |
||||
tt0 = &transition_types_[tr0->type_index]; |
||||
tt1 = &transition_types_[tr1->type_index]; |
||||
} |
||||
const PosixTransition& pt1(tt0->is_dst ? posix.dst_end : posix.dst_start); |
||||
const PosixTransition& pt0(tt0->is_dst ? posix.dst_start : posix.dst_end); |
||||
for (const year_t limit = last_year_ + 400; last_year_ < limit;) { |
||||
last_year_ += 1; // an additional year of generated transitions
|
||||
jan1_time += kSecsPerYear[leap_year]; |
||||
jan1_weekday = (jan1_weekday + kDaysPerYear[leap_year]) % 7; |
||||
leap_year = !leap_year && IsLeap(last_year_); |
||||
std::int_fast64_t tr1_offset = TransOffset(leap_year, jan1_weekday, pt1); |
||||
tr->unix_time = jan1_time + tr1_offset - tt0->utc_offset; |
||||
tr++->type_index = tr1->type_index; |
||||
std::int_fast64_t tr0_offset = TransOffset(leap_year, jan1_weekday, pt0); |
||||
tr->unix_time = jan1_time + tr0_offset - tt1->utc_offset; |
||||
tr++->type_index = tr0->type_index; |
||||
} |
||||
assert(tr == &transitions_[0] + transitions_.size()); |
||||
} |
||||
|
||||
bool TimeZoneInfo::Load(const std::string& name, ZoneInfoSource* zip) { |
||||
// Read and validate the header.
|
||||
tzhead tzh; |
||||
if (zip->Read(&tzh, sizeof(tzh)) != sizeof(tzh)) |
||||
return false; |
||||
if (strncmp(tzh.tzh_magic, TZ_MAGIC, sizeof(tzh.tzh_magic)) != 0) |
||||
return false; |
||||
Header hdr; |
||||
if (!hdr.Build(tzh)) |
||||
return false; |
||||
std::size_t time_len = 4; |
||||
if (tzh.tzh_version[0] != '\0') { |
||||
// Skip the 4-byte data.
|
||||
if (zip->Skip(hdr.DataLength(time_len)) != 0) |
||||
return false; |
||||
// Read and validate the header for the 8-byte data.
|
||||
if (zip->Read(&tzh, sizeof(tzh)) != sizeof(tzh)) |
||||
return false; |
||||
if (strncmp(tzh.tzh_magic, TZ_MAGIC, sizeof(tzh.tzh_magic)) != 0) |
||||
return false; |
||||
if (tzh.tzh_version[0] == '\0') |
||||
return false; |
||||
if (!hdr.Build(tzh)) |
||||
return false; |
||||
time_len = 8; |
||||
} |
||||
if (hdr.typecnt == 0) |
||||
return false; |
||||
if (hdr.leapcnt != 0) { |
||||
// This code assumes 60-second minutes so we do not want
|
||||
// the leap-second encoded zoneinfo. We could reverse the
|
||||
// compensation, but the "right" encoding is rarely used
|
||||
// so currently we simply reject such data.
|
||||
return false; |
||||
} |
||||
if (hdr.ttisstdcnt != 0 && hdr.ttisstdcnt != hdr.typecnt) |
||||
return false; |
||||
if (hdr.ttisgmtcnt != 0 && hdr.ttisgmtcnt != hdr.typecnt) |
||||
return false; |
||||
|
||||
// Read the data into a local buffer.
|
||||
std::size_t len = hdr.DataLength(time_len); |
||||
std::vector<char> tbuf(len); |
||||
if (zip->Read(tbuf.data(), len) != len) |
||||
return false; |
||||
const char* bp = tbuf.data(); |
||||
|
||||
// Decode and validate the transitions.
|
||||
transitions_.reserve(hdr.timecnt + 2); // We might add a couple.
|
||||
transitions_.resize(hdr.timecnt); |
||||
for (std::size_t i = 0; i != hdr.timecnt; ++i) { |
||||
transitions_[i].unix_time = (time_len == 4) ? Decode32(bp) : Decode64(bp); |
||||
bp += time_len; |
||||
if (i != 0) { |
||||
// Check that the transitions are ordered by time (as zic guarantees).
|
||||
if (!Transition::ByUnixTime()(transitions_[i - 1], transitions_[i])) |
||||
return false; // out of order
|
||||
} |
||||
} |
||||
bool seen_type_0 = false; |
||||
for (std::size_t i = 0; i != hdr.timecnt; ++i) { |
||||
transitions_[i].type_index = Decode8(bp++); |
||||
if (transitions_[i].type_index >= hdr.typecnt) |
||||
return false; |
||||
if (transitions_[i].type_index == 0) |
||||
seen_type_0 = true; |
||||
} |
||||
|
||||
// Decode and validate the transition types.
|
||||
transition_types_.resize(hdr.typecnt); |
||||
for (std::size_t i = 0; i != hdr.typecnt; ++i) { |
||||
transition_types_[i].utc_offset = |
||||
static_cast<std::int_least32_t>(Decode32(bp)); |
||||
if (transition_types_[i].utc_offset >= kSecsPerDay || |
||||
transition_types_[i].utc_offset <= -kSecsPerDay) |
||||
return false; |
||||
bp += 4; |
||||
transition_types_[i].is_dst = (Decode8(bp++) != 0); |
||||
transition_types_[i].abbr_index = Decode8(bp++); |
||||
if (transition_types_[i].abbr_index >= hdr.charcnt) |
||||
return false; |
||||
} |
||||
|
||||
// Determine the before-first-transition type.
|
||||
default_transition_type_ = 0; |
||||
if (seen_type_0 && hdr.timecnt != 0) { |
||||
std::uint_fast8_t index = 0; |
||||
if (transition_types_[0].is_dst) { |
||||
index = transitions_[0].type_index; |
||||
while (index != 0 && transition_types_[index].is_dst) |
||||
--index; |
||||
} |
||||
while (index != hdr.typecnt && transition_types_[index].is_dst) |
||||
++index; |
||||
if (index != hdr.typecnt) |
||||
default_transition_type_ = index; |
||||
} |
||||
|
||||
// Copy all the abbreviations.
|
||||
abbreviations_.assign(bp, hdr.charcnt); |
||||
bp += hdr.charcnt; |
||||
|
||||
// Skip the unused portions. We've already dispensed with leap-second
|
||||
// encoded zoneinfo. The ttisstd/ttisgmt indicators only apply when
|
||||
// interpreting a POSIX spec that does not include start/end rules, and
|
||||
// that isn't the case here (see "zic -p").
|
||||
bp += (8 + 4) * hdr.leapcnt; // leap-time + TAI-UTC
|
||||
bp += 1 * hdr.ttisstdcnt; // UTC/local indicators
|
||||
bp += 1 * hdr.ttisgmtcnt; // standard/wall indicators
|
||||
assert(bp == tbuf.data() + tbuf.size()); |
||||
|
||||
future_spec_.clear(); |
||||
if (tzh.tzh_version[0] != '\0') { |
||||
// Snarf up the NL-enclosed future POSIX spec. Note
|
||||
// that version '3' files utilize an extended format.
|
||||
auto get_char = [](ZoneInfoSource* zip) -> int { |
||||
unsigned char ch; // all non-EOF results are positive
|
||||
return (zip->Read(&ch, 1) == 1) ? ch : EOF; |
||||
}; |
||||
if (get_char(zip) != '\n') |
||||
return false; |
||||
for (int c = get_char(zip); c != '\n'; c = get_char(zip)) { |
||||
if (c == EOF) |
||||
return false; |
||||
future_spec_.push_back(static_cast<char>(c)); |
||||
} |
||||
} |
||||
|
||||
// We don't check for EOF so that we're forwards compatible.
|
||||
|
||||
// Trim redundant transitions. zic may have added these to work around
|
||||
// differences between the glibc and reference implementations (see
|
||||
// zic.c:dontmerge) and the Qt library (see zic.c:WORK_AROUND_QTBUG_53071).
|
||||
// For us, they just get in the way when we do future_spec_ extension.
|
||||
while (hdr.timecnt > 1) { |
||||
if (!EquivTransitions(transitions_[hdr.timecnt - 1].type_index, |
||||
transitions_[hdr.timecnt - 2].type_index)) { |
||||
break; |
||||
} |
||||
hdr.timecnt -= 1; |
||||
} |
||||
transitions_.resize(hdr.timecnt); |
||||
|
||||
// Ensure that there is always a transition in the first half of the
|
||||
// time line (the second half is handled in ExtendTransitions()) so that
|
||||
// the signed difference between a civil_second and the civil_second of
|
||||
// its previous transition is always representable, without overflow.
|
||||
// A contemporary zic will usually have already done this for us.
|
||||
if (transitions_.empty() || transitions_.front().unix_time >= 0) { |
||||
Transition& tr(*transitions_.emplace(transitions_.begin())); |
||||
tr.unix_time = -(1LL << 59); // see tz/zic.c "BIG_BANG"
|
||||
tr.type_index = default_transition_type_; |
||||
hdr.timecnt += 1; |
||||
} |
||||
|
||||
// Extend the transitions using the future specification.
|
||||
ExtendTransitions(name, hdr); |
||||
|
||||
// Compute the local civil time for each transition and the preceding
|
||||
// second. These will be used for reverse conversions in MakeTime().
|
||||
const TransitionType* ttp = &transition_types_[default_transition_type_]; |
||||
for (std::size_t i = 0; i != transitions_.size(); ++i) { |
||||
Transition& tr(transitions_[i]); |
||||
tr.prev_civil_sec = LocalTime(tr.unix_time, *ttp).cs - 1; |
||||
ttp = &transition_types_[tr.type_index]; |
||||
tr.civil_sec = LocalTime(tr.unix_time, *ttp).cs; |
||||
if (i != 0) { |
||||
// Check that the transitions are ordered by civil time. Essentially
|
||||
// this means that an offset change cannot cross another such change.
|
||||
// No one does this in practice, and we depend on it in MakeTime().
|
||||
if (!Transition::ByCivilTime()(transitions_[i - 1], tr)) |
||||
return false; // out of order
|
||||
} |
||||
} |
||||
|
||||
// Compute the maximum/minimum civil times that can be converted to a
|
||||
// time_point<sys_seconds> for each of the zone's transition types.
|
||||
for (auto& tt : transition_types_) { |
||||
tt.civil_max = LocalTime(sys_seconds::max().count(), tt).cs; |
||||
tt.civil_min = LocalTime(sys_seconds::min().count(), tt).cs; |
||||
} |
||||
|
||||
transitions_.shrink_to_fit(); |
||||
return true; |
||||
} |
||||
|
||||
namespace { |
||||
|
||||
// fopen(3) adaptor.
|
||||
inline FILE* FOpen(const char* path, const char* mode) { |
||||
#if defined(_MSC_VER) |
||||
FILE* fp; |
||||
if (fopen_s(&fp, path, mode) != 0) fp = nullptr; |
||||
return fp; |
||||
#else |
||||
return fopen(path, mode); // TODO: Enable the close-on-exec flag.
|
||||
#endif |
||||
} |
||||
|
||||
// A stdio(3)-backed implementation of ZoneInfoSource.
|
||||
class FileZoneInfoSource : public ZoneInfoSource { |
||||
public: |
||||
static std::unique_ptr<ZoneInfoSource> Open(const std::string& name); |
||||
|
||||
std::size_t Read(void* ptr, std::size_t size) override { |
||||
size = std::min(size, len_); |
||||
std::size_t nread = fread(ptr, 1, size, fp_.get()); |
||||
len_ -= nread; |
||||
return nread; |
||||
} |
||||
int Skip(std::size_t offset) override { |
||||
offset = std::min(offset, len_); |
||||
int rc = fseek(fp_.get(), static_cast<long>(offset), SEEK_CUR); |
||||
if (rc == 0) len_ -= offset; |
||||
return rc; |
||||
} |
||||
|
||||
protected: |
||||
explicit FileZoneInfoSource( |
||||
FILE* fp, std::size_t len = std::numeric_limits<std::size_t>::max()) |
||||
: fp_(fp, fclose), len_(len) {} |
||||
|
||||
private: |
||||
std::unique_ptr<FILE, int(*)(FILE*)> fp_; |
||||
std::size_t len_; |
||||
}; |
||||
|
||||
std::unique_ptr<ZoneInfoSource> FileZoneInfoSource::Open( |
||||
const std::string& name) { |
||||
// Use of the "file:" prefix is intended for testing purposes only.
|
||||
if (name.compare(0, 5, "file:") == 0) return Open(name.substr(5)); |
||||
|
||||
// Map the time-zone name to a path name.
|
||||
std::string path; |
||||
if (name.empty() || name[0] != '/') { |
||||
const char* tzdir = "/usr/share/zoneinfo"; |
||||
char* tzdir_env = nullptr; |
||||
#if defined(_MSC_VER) |
||||
_dupenv_s(&tzdir_env, nullptr, "TZDIR"); |
||||
#else |
||||
tzdir_env = std::getenv("TZDIR"); |
||||
#endif |
||||
if (tzdir_env && *tzdir_env) tzdir = tzdir_env; |
||||
path += tzdir; |
||||
path += '/'; |
||||
#if defined(_MSC_VER) |
||||
free(tzdir_env); |
||||
#endif |
||||
} |
||||
path += name; |
||||
|
||||
// Open the zoneinfo file.
|
||||
FILE* fp = FOpen(path.c_str(), "rb"); |
||||
if (fp == nullptr) return nullptr; |
||||
std::size_t length = 0; |
||||
if (fseek(fp, 0, SEEK_END) == 0) { |
||||
long pos = ftell(fp); |
||||
if (pos >= 0) { |
||||
length = static_cast<std::size_t>(pos); |
||||
} |
||||
rewind(fp); |
||||
} |
||||
return std::unique_ptr<ZoneInfoSource>(new FileZoneInfoSource(fp, length)); |
||||
} |
||||
|
||||
#if defined(__ANDROID__) |
||||
class AndroidZoneInfoSource : public FileZoneInfoSource { |
||||
public: |
||||
static std::unique_ptr<ZoneInfoSource> Open(const std::string& name); |
||||
|
||||
private: |
||||
explicit AndroidZoneInfoSource(FILE* fp, std::size_t len) |
||||
: FileZoneInfoSource(fp, len) {} |
||||
}; |
||||
|
||||
std::unique_ptr<ZoneInfoSource> AndroidZoneInfoSource::Open( |
||||
const std::string& name) { |
||||
// Use of the "file:" prefix is intended for testing purposes only.
|
||||
if (name.compare(0, 5, "file:") == 0) return Open(name.substr(5)); |
||||
|
||||
// See Android's libc/tzcode/bionic.cpp for additional information.
|
||||
for (const char* tzdata : {"/data/misc/zoneinfo/current/tzdata", |
||||
"/system/usr/share/zoneinfo/tzdata"}) { |
||||
std::unique_ptr<FILE, int (*)(FILE*)> fp(FOpen(tzdata, "rb"), fclose); |
||||
if (fp.get() == nullptr) continue; |
||||
|
||||
char hbuf[24]; // covers header.zonetab_offset too
|
||||
if (fread(hbuf, 1, sizeof(hbuf), fp.get()) != sizeof(hbuf)) continue; |
||||
if (strncmp(hbuf, "tzdata", 6) != 0) continue; |
||||
const std::int_fast32_t index_offset = Decode32(hbuf + 12); |
||||
const std::int_fast32_t data_offset = Decode32(hbuf + 16); |
||||
if (index_offset < 0 || data_offset < index_offset) continue; |
||||
if (fseek(fp.get(), static_cast<long>(index_offset), SEEK_SET) != 0) |
||||
continue; |
||||
|
||||
char ebuf[52]; // covers entry.unused too
|
||||
const std::size_t index_size = |
||||
static_cast<std::size_t>(data_offset - index_offset); |
||||
const std::size_t zonecnt = index_size / sizeof(ebuf); |
||||
if (zonecnt * sizeof(ebuf) != index_size) continue; |
||||
for (std::size_t i = 0; i != zonecnt; ++i) { |
||||
if (fread(ebuf, 1, sizeof(ebuf), fp.get()) != sizeof(ebuf)) break; |
||||
const std::int_fast32_t start = data_offset + Decode32(ebuf + 40); |
||||
const std::int_fast32_t length = Decode32(ebuf + 44); |
||||
if (start < 0 || length < 0) break; |
||||
ebuf[40] = '\0'; // ensure zone name is NUL terminated
|
||||
if (strcmp(name.c_str(), ebuf) == 0) { |
||||
if (fseek(fp.get(), static_cast<long>(start), SEEK_SET) != 0) break; |
||||
return std::unique_ptr<ZoneInfoSource>(new AndroidZoneInfoSource( |
||||
fp.release(), static_cast<std::size_t>(length))); |
||||
} |
||||
} |
||||
} |
||||
return nullptr; |
||||
} |
||||
#endif |
||||
|
||||
} // namespace
|
||||
|
||||
bool TimeZoneInfo::Load(const std::string& name) { |
||||
// We can ensure that the loading of UTC or any other fixed-offset
|
||||
// zone never fails because the simple, fixed-offset state can be
|
||||
// internally generated. Note that this depends on our choice to not
|
||||
// accept leap-second encoded ("right") zoneinfo.
|
||||
auto offset = sys_seconds::zero(); |
||||
if (FixedOffsetFromName(name, &offset)) { |
||||
return ResetToBuiltinUTC(offset); |
||||
} |
||||
|
||||
// Find and use a ZoneInfoSource to load the named zone.
|
||||
auto zip = cctz_extension::zone_info_source_factory( |
||||
name, [](const std::string& name) -> std::unique_ptr<ZoneInfoSource> { |
||||
if (auto zip = FileZoneInfoSource::Open(name)) return zip; |
||||
#if defined(__ANDROID__) |
||||
if (auto zip = AndroidZoneInfoSource::Open(name)) return zip; |
||||
#endif |
||||
return nullptr; |
||||
}); |
||||
return zip != nullptr && Load(name, zip.get()); |
||||
} |
||||
|
||||
// BreakTime() translation for a particular transition type.
|
||||
time_zone::absolute_lookup TimeZoneInfo::LocalTime( |
||||
std::int_fast64_t unix_time, const TransitionType& tt) const { |
||||
// A civil time in "+offset" looks like (time+offset) in UTC.
|
||||
// Note: We perform two additions in the civil_second domain to
|
||||
// sidestep the chance of overflow in (unix_time + tt.utc_offset).
|
||||
return {(civil_second() + unix_time) + tt.utc_offset, |
||||
tt.utc_offset, tt.is_dst, &abbreviations_[tt.abbr_index]}; |
||||
} |
||||
|
||||
// BreakTime() translation for a particular transition.
|
||||
time_zone::absolute_lookup TimeZoneInfo::LocalTime( |
||||
std::int_fast64_t unix_time, const Transition& tr) const { |
||||
const TransitionType& tt = transition_types_[tr.type_index]; |
||||
// Note: (unix_time - tr.unix_time) will never overflow as we
|
||||
// have ensured that there is always a "nearby" transition.
|
||||
return {tr.civil_sec + (unix_time - tr.unix_time), // TODO: Optimize.
|
||||
tt.utc_offset, tt.is_dst, &abbreviations_[tt.abbr_index]}; |
||||
} |
||||
|
||||
// MakeTime() translation with a conversion-preserving +N * 400-year shift.
|
||||
time_zone::civil_lookup TimeZoneInfo::TimeLocal(const civil_second& cs, |
||||
year_t c4_shift) const { |
||||
assert(last_year_ - 400 < cs.year() && cs.year() <= last_year_); |
||||
time_zone::civil_lookup cl = MakeTime(cs); |
||||
if (c4_shift > sys_seconds::max().count() / kSecsPer400Years) { |
||||
cl.pre = cl.trans = cl.post = time_point<sys_seconds>::max(); |
||||
} else { |
||||
const auto offset = sys_seconds(c4_shift * kSecsPer400Years); |
||||
const auto limit = time_point<sys_seconds>::max() - offset; |
||||
for (auto* tp : {&cl.pre, &cl.trans, &cl.post}) { |
||||
if (*tp > limit) { |
||||
*tp = time_point<sys_seconds>::max(); |
||||
} else { |
||||
*tp += offset; |
||||
} |
||||
} |
||||
} |
||||
return cl; |
||||
} |
||||
|
||||
time_zone::absolute_lookup TimeZoneInfo::BreakTime( |
||||
const time_point<sys_seconds>& tp) const { |
||||
std::int_fast64_t unix_time = ToUnixSeconds(tp); |
||||
const std::size_t timecnt = transitions_.size(); |
||||
assert(timecnt != 0); // We always add a transition.
|
||||
|
||||
if (unix_time < transitions_[0].unix_time) { |
||||
return LocalTime(unix_time, transition_types_[default_transition_type_]); |
||||
} |
||||
if (unix_time >= transitions_[timecnt - 1].unix_time) { |
||||
// After the last transition. If we extended the transitions using
|
||||
// future_spec_, shift back to a supported year using the 400-year
|
||||
// cycle of calendaric equivalence and then compensate accordingly.
|
||||
if (extended_) { |
||||
const std::int_fast64_t diff = |
||||
unix_time - transitions_[timecnt - 1].unix_time; |
||||
const year_t shift = diff / kSecsPer400Years + 1; |
||||
const auto d = sys_seconds(shift * kSecsPer400Years); |
||||
time_zone::absolute_lookup al = BreakTime(tp - d); |
||||
al.cs = YearShift(al.cs, shift * 400); |
||||
return al; |
||||
} |
||||
return LocalTime(unix_time, transitions_[timecnt - 1]); |
||||
} |
||||
|
||||
const std::size_t hint = local_time_hint_.load(std::memory_order_relaxed); |
||||
if (0 < hint && hint < timecnt) { |
||||
if (transitions_[hint - 1].unix_time <= unix_time) { |
||||
if (unix_time < transitions_[hint].unix_time) { |
||||
return LocalTime(unix_time, transitions_[hint - 1]); |
||||
} |
||||
} |
||||
} |
||||
|
||||
const Transition target = {unix_time, 0, civil_second(), civil_second()}; |
||||
const Transition* begin = &transitions_[0]; |
||||
const Transition* tr = std::upper_bound(begin, begin + timecnt, target, |
||||
Transition::ByUnixTime()); |
||||
local_time_hint_.store(static_cast<std::size_t>(tr - begin), |
||||
std::memory_order_relaxed); |
||||
return LocalTime(unix_time, *--tr); |
||||
} |
||||
|
||||
time_zone::civil_lookup TimeZoneInfo::MakeTime(const civil_second& cs) const { |
||||
const std::size_t timecnt = transitions_.size(); |
||||
assert(timecnt != 0); // We always add a transition.
|
||||
|
||||
// Find the first transition after our target civil time.
|
||||
const Transition* tr = nullptr; |
||||
const Transition* begin = &transitions_[0]; |
||||
const Transition* end = begin + timecnt; |
||||
if (cs < begin->civil_sec) { |
||||
tr = begin; |
||||
} else if (cs >= transitions_[timecnt - 1].civil_sec) { |
||||
tr = end; |
||||
} else { |
||||
const std::size_t hint = time_local_hint_.load(std::memory_order_relaxed); |
||||
if (0 < hint && hint < timecnt) { |
||||
if (transitions_[hint - 1].civil_sec <= cs) { |
||||
if (cs < transitions_[hint].civil_sec) { |
||||
tr = begin + hint; |
||||
} |
||||
} |
||||
} |
||||
if (tr == nullptr) { |
||||
const Transition target = {0, 0, cs, civil_second()}; |
||||
tr = std::upper_bound(begin, end, target, Transition::ByCivilTime()); |
||||
time_local_hint_.store(static_cast<std::size_t>(tr - begin), |
||||
std::memory_order_relaxed); |
||||
} |
||||
} |
||||
|
||||
if (tr == begin) { |
||||
if (tr->prev_civil_sec >= cs) { |
||||
// Before first transition, so use the default offset.
|
||||
const TransitionType& tt(transition_types_[default_transition_type_]); |
||||
if (cs < tt.civil_min) return MakeUnique(time_point<sys_seconds>::min()); |
||||
return MakeUnique(cs - (civil_second() + tt.utc_offset)); |
||||
} |
||||
// tr->prev_civil_sec < cs < tr->civil_sec
|
||||
return MakeSkipped(*tr, cs); |
||||
} |
||||
|
||||
if (tr == end) { |
||||
if (cs > (--tr)->prev_civil_sec) { |
||||
// After the last transition. If we extended the transitions using
|
||||
// future_spec_, shift back to a supported year using the 400-year
|
||||
// cycle of calendaric equivalence and then compensate accordingly.
|
||||
if (extended_ && cs.year() > last_year_) { |
||||
const year_t shift = (cs.year() - last_year_ - 1) / 400 + 1; |
||||
return TimeLocal(YearShift(cs, shift * -400), shift); |
||||
} |
||||
const TransitionType& tt(transition_types_[tr->type_index]); |
||||
if (cs > tt.civil_max) return MakeUnique(time_point<sys_seconds>::max()); |
||||
return MakeUnique(tr->unix_time + (cs - tr->civil_sec)); |
||||
} |
||||
// tr->civil_sec <= cs <= tr->prev_civil_sec
|
||||
return MakeRepeated(*tr, cs); |
||||
} |
||||
|
||||
if (tr->prev_civil_sec < cs) { |
||||
// tr->prev_civil_sec < cs < tr->civil_sec
|
||||
return MakeSkipped(*tr, cs); |
||||
} |
||||
|
||||
if (cs <= (--tr)->prev_civil_sec) { |
||||
// tr->civil_sec <= cs <= tr->prev_civil_sec
|
||||
return MakeRepeated(*tr, cs); |
||||
} |
||||
|
||||
// In between transitions.
|
||||
return MakeUnique(tr->unix_time + (cs - tr->civil_sec)); |
||||
} |
||||
|
||||
std::string TimeZoneInfo::Description() const { |
||||
std::ostringstream oss; |
||||
// TODO: It would nice if the zoneinfo data included the zone name.
|
||||
// TODO: It would nice if the zoneinfo data included the tzdb version.
|
||||
oss << "#trans=" << transitions_.size(); |
||||
oss << " #types=" << transition_types_.size(); |
||||
oss << " spec='" << future_spec_ << "'"; |
||||
return oss.str(); |
||||
} |
||||
|
||||
bool TimeZoneInfo::NextTransition(time_point<sys_seconds>* tp) const { |
||||
if (transitions_.empty()) return false; |
||||
const Transition* begin = &transitions_[0]; |
||||
const Transition* end = begin + transitions_.size(); |
||||
if (begin->unix_time <= -(1LL << 59)) { |
||||
// Do not report the BIG_BANG found in recent zoneinfo data as it is
|
||||
// really a sentinel, not a transition. See tz/zic.c.
|
||||
++begin; |
||||
} |
||||
std::int_fast64_t unix_time = ToUnixSeconds(*tp); |
||||
const Transition target = { unix_time }; |
||||
const Transition* tr = std::upper_bound(begin, end, target, |
||||
Transition::ByUnixTime()); |
||||
if (tr != begin) { // skip no-op transitions
|
||||
for (; tr != end; ++tr) { |
||||
if (!EquivTransitions(tr[-1].type_index, tr[0].type_index)) break; |
||||
} |
||||
} |
||||
// When tr == end we return false, ignoring future_spec_.
|
||||
if (tr == end) return false; |
||||
*tp = FromUnixSeconds(tr->unix_time); |
||||
return true; |
||||
} |
||||
|
||||
bool TimeZoneInfo::PrevTransition(time_point<sys_seconds>* tp) const { |
||||
if (transitions_.empty()) return false; |
||||
const Transition* begin = &transitions_[0]; |
||||
const Transition* end = begin + transitions_.size(); |
||||
if (begin->unix_time <= -(1LL << 59)) { |
||||
// Do not report the BIG_BANG found in recent zoneinfo data as it is
|
||||
// really a sentinel, not a transition. See tz/zic.c.
|
||||
++begin; |
||||
} |
||||
std::int_fast64_t unix_time = ToUnixSeconds(*tp); |
||||
if (FromUnixSeconds(unix_time) != *tp) { |
||||
if (unix_time == std::numeric_limits<std::int_fast64_t>::max()) { |
||||
if (end == begin) return false; // Ignore future_spec_.
|
||||
*tp = FromUnixSeconds((--end)->unix_time); |
||||
return true; |
||||
} |
||||
unix_time += 1; // ceils
|
||||
} |
||||
const Transition target = { unix_time }; |
||||
const Transition* tr = std::lower_bound(begin, end, target, |
||||
Transition::ByUnixTime()); |
||||
if (tr != begin) { // skip no-op transitions
|
||||
for (; tr - 1 != begin; --tr) { |
||||
if (!EquivTransitions(tr[-2].type_index, tr[-1].type_index)) break; |
||||
} |
||||
} |
||||
// When tr == end we return the "last" transition, ignoring future_spec_.
|
||||
if (tr == begin) return false; |
||||
*tp = FromUnixSeconds((--tr)->unix_time); |
||||
return true; |
||||
} |
||||
|
||||
} // namespace cctz
|
||||
} // namespace time_internal
|
||||
} // namespace absl
|
||||
@ -0,0 +1,132 @@ |
||||
// 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
|
||||
//
|
||||
// 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 ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_INFO_H_ |
||||
#define ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_INFO_H_ |
||||
|
||||
#include <atomic> |
||||
#include <cstddef> |
||||
#include <cstdint> |
||||
#include <string> |
||||
#include <vector> |
||||
|
||||
#include "absl/time/internal/cctz/include/cctz/civil_time.h" |
||||
#include "absl/time/internal/cctz/include/cctz/time_zone.h" |
||||
#include "absl/time/internal/cctz/include/cctz/zone_info_source.h" |
||||
#include "time_zone_if.h" |
||||
#include "tzfile.h" |
||||
|
||||
namespace absl { |
||||
namespace time_internal { |
||||
namespace cctz { |
||||
|
||||
// A transition to a new UTC offset.
|
||||
struct Transition { |
||||
std::int_least64_t unix_time; // the instant of this transition
|
||||
std::uint_least8_t type_index; // index of the transition type
|
||||
civil_second civil_sec; // local civil time of transition
|
||||
civil_second prev_civil_sec; // local civil time one second earlier
|
||||
|
||||
struct ByUnixTime { |
||||
inline bool operator()(const Transition& lhs, const Transition& rhs) const { |
||||
return lhs.unix_time < rhs.unix_time; |
||||
} |
||||
}; |
||||
struct ByCivilTime { |
||||
inline bool operator()(const Transition& lhs, const Transition& rhs) const { |
||||
return lhs.civil_sec < rhs.civil_sec; |
||||
} |
||||
}; |
||||
}; |
||||
|
||||
// The characteristics of a particular transition.
|
||||
struct TransitionType { |
||||
std::int_least32_t utc_offset; // the new prevailing UTC offset
|
||||
civil_second civil_max; // max convertible civil time for offset
|
||||
civil_second civil_min; // min convertible civil time for offset
|
||||
bool is_dst; // did we move into daylight-saving time
|
||||
std::uint_least8_t abbr_index; // index of the new abbreviation
|
||||
}; |
||||
|
||||
// A time zone backed by the IANA Time Zone Database (zoneinfo).
|
||||
class TimeZoneInfo : public TimeZoneIf { |
||||
public: |
||||
TimeZoneInfo() = default; |
||||
TimeZoneInfo(const TimeZoneInfo&) = delete; |
||||
TimeZoneInfo& operator=(const TimeZoneInfo&) = delete; |
||||
|
||||
// Loads the zoneinfo for the given name, returning true if successful.
|
||||
bool Load(const std::string& name); |
||||
|
||||
// TimeZoneIf implementations.
|
||||
time_zone::absolute_lookup BreakTime( |
||||
const time_point<sys_seconds>& tp) const override; |
||||
time_zone::civil_lookup MakeTime( |
||||
const civil_second& cs) const override; |
||||
std::string Description() const override; |
||||
bool NextTransition(time_point<sys_seconds>* tp) const override; |
||||
bool PrevTransition(time_point<sys_seconds>* tp) const override; |
||||
|
||||
private: |
||||
struct Header { // counts of:
|
||||
std::size_t timecnt; // transition times
|
||||
std::size_t typecnt; // transition types
|
||||
std::size_t charcnt; // zone abbreviation characters
|
||||
std::size_t leapcnt; // leap seconds (we expect none)
|
||||
std::size_t ttisstdcnt; // UTC/local indicators (unused)
|
||||
std::size_t ttisgmtcnt; // standard/wall indicators (unused)
|
||||
|
||||
bool Build(const tzhead& tzh); |
||||
std::size_t DataLength(std::size_t time_len) const; |
||||
}; |
||||
|
||||
void CheckTransition(const std::string& name, const TransitionType& tt, |
||||
std::int_fast32_t offset, bool is_dst, |
||||
const std::string& abbr) const; |
||||
bool EquivTransitions(std::uint_fast8_t tt1_index, |
||||
std::uint_fast8_t tt2_index) const; |
||||
void ExtendTransitions(const std::string& name, const Header& hdr); |
||||
|
||||
bool ResetToBuiltinUTC(const sys_seconds& offset); |
||||
bool Load(const std::string& name, ZoneInfoSource* zip); |
||||
|
||||
// Helpers for BreakTime() and MakeTime().
|
||||
time_zone::absolute_lookup LocalTime(std::int_fast64_t unix_time, |
||||
const TransitionType& tt) const; |
||||
time_zone::absolute_lookup LocalTime(std::int_fast64_t unix_time, |
||||
const Transition& tr) const; |
||||
time_zone::civil_lookup TimeLocal(const civil_second& cs, |
||||
year_t c4_shift) const; |
||||
|
||||
std::vector<Transition> transitions_; // ordered by unix_time and civil_sec
|
||||
std::vector<TransitionType> transition_types_; // distinct transition types
|
||||
std::uint_fast8_t default_transition_type_; // for before first transition
|
||||
std::string abbreviations_; // all the NUL-terminated abbreviations
|
||||
|
||||
std::string future_spec_; // for after the last zic transition
|
||||
bool extended_; // future_spec_ was used to generate transitions
|
||||
year_t last_year_; // the final year of the generated transitions
|
||||
|
||||
// We remember the transitions found during the last BreakTime() and
|
||||
// MakeTime() calls. If the next request is for the same transition we
|
||||
// will avoid re-searching.
|
||||
mutable std::atomic<std::size_t> local_time_hint_ = {}; // BreakTime() hint
|
||||
mutable std::atomic<std::size_t> time_local_hint_ = {}; // MakeTime() hint
|
||||
}; |
||||
|
||||
} // namespace cctz
|
||||
} // namespace time_internal
|
||||
} // namespace absl
|
||||
|
||||
#endif // ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_INFO_H_
|
||||
@ -0,0 +1,156 @@ |
||||
// 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
|
||||
//
|
||||
// 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.
|
||||
|
||||
#if defined(_WIN32) || defined(_WIN64) |
||||
#define _CRT_SECURE_NO_WARNINGS 1 |
||||
#endif |
||||
|
||||
#include "time_zone_libc.h" |
||||
|
||||
#include <chrono> |
||||
#include <ctime> |
||||
#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 { |
||||
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) { |
||||
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}; |
||||
} |
||||
#elif defined(__sun) |
||||
// Uses the globals: 'timezone', 'altzone' and 'tzname'.
|
||||
OffsetAbbr get_offset_abbr(const std::tm& tm) { |
||||
const bool is_dst = tm.tm_isdst > 0; |
||||
const int off = is_dst ? altzone : timezone; |
||||
const char* abbr = tzname[is_dst]; |
||||
return {off, abbr}; |
||||
} |
||||
#elif defined(__native_client__) || defined(__myriad2__) || \ |
||||
defined(__EMSCRIPTEN__) |
||||
// Uses the globals: 'timezone' and 'tzname'.
|
||||
OffsetAbbr get_offset_abbr(const std::tm& tm) { |
||||
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}; |
||||
} |
||||
#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}; |
||||
} |
||||
#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}; |
||||
} |
||||
#endif // !defined(__tm_gmtoff) && !defined(__tm_zone)
|
||||
#endif |
||||
|
||||
} // namespace
|
||||
|
||||
TimeZoneLibC::TimeZoneLibC(const std::string& name) |
||||
: local_(name == "localtime") {} |
||||
|
||||
time_zone::absolute_lookup TimeZoneLibC::BreakTime( |
||||
const time_point<sys_seconds>& tp) const { |
||||
time_zone::absolute_lookup al; |
||||
std::time_t t = ToUnixSeconds(tp); |
||||
std::tm tm; |
||||
if (local_) { |
||||
#if defined(_WIN32) || defined(_WIN64) |
||||
localtime_s(&tm, &t); |
||||
#else |
||||
localtime_r(&t, &tm); |
||||
#endif |
||||
std::tie(al.offset, al.abbr) = get_offset_abbr(tm); |
||||
} else { |
||||
#if defined(_WIN32) || defined(_WIN64) |
||||
gmtime_s(&tm, &t); |
||||
#else |
||||
gmtime_r(&t, &tm); |
||||
#endif |
||||
al.offset = 0; |
||||
al.abbr = "UTC"; |
||||
} |
||||
al.cs = civil_second(tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, |
||||
tm.tm_hour, tm.tm_min, tm.tm_sec); |
||||
al.is_dst = tm.tm_isdst > 0; |
||||
return al; |
||||
} |
||||
|
||||
time_zone::civil_lookup TimeZoneLibC::MakeTime(const civil_second& cs) const { |
||||
time_zone::civil_lookup cl; |
||||
std::time_t t; |
||||
if (local_) { |
||||
// Does not handle SKIPPED/AMBIGUOUS or huge years.
|
||||
std::tm tm; |
||||
tm.tm_year = static_cast<int>(cs.year() - 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 = -1; |
||||
t = std::mktime(&tm); |
||||
} else { |
||||
t = cs - civil_second(); |
||||
} |
||||
cl.kind = time_zone::civil_lookup::UNIQUE; |
||||
cl.pre = cl.trans = cl.post = FromUnixSeconds(t); |
||||
return cl; |
||||
} |
||||
|
||||
std::string TimeZoneLibC::Description() const { |
||||
return local_ ? "localtime" : "UTC"; |
||||
} |
||||
|
||||
bool TimeZoneLibC::NextTransition(time_point<sys_seconds>* tp) const { |
||||
return false; |
||||
} |
||||
|
||||
bool TimeZoneLibC::PrevTransition(time_point<sys_seconds>* tp) const { |
||||
return false; |
||||
} |
||||
|
||||
} // namespace cctz
|
||||
} // namespace time_internal
|
||||
} // namespace absl
|
||||
@ -0,0 +1,50 @@ |
||||
// 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
|
||||
//
|
||||
// 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 ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_LIBC_H_ |
||||
#define ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_LIBC_H_ |
||||
|
||||
#include <string> |
||||
|
||||
#include "time_zone_if.h" |
||||
|
||||
namespace absl { |
||||
namespace time_internal { |
||||
namespace cctz { |
||||
|
||||
// A time zone backed by gmtime_r(3), localtime_r(3), and mktime(3),
|
||||
// and which therefore only supports UTC and the local time zone.
|
||||
// TODO: Add support for fixed offsets from UTC.
|
||||
class TimeZoneLibC : public TimeZoneIf { |
||||
public: |
||||
explicit TimeZoneLibC(const std::string& name); |
||||
|
||||
// TimeZoneIf implementations.
|
||||
time_zone::absolute_lookup BreakTime( |
||||
const time_point<sys_seconds>& tp) const override; |
||||
time_zone::civil_lookup MakeTime( |
||||
const civil_second& cs) const override; |
||||
std::string Description() const override; |
||||
bool NextTransition(time_point<sys_seconds>* tp) const override; |
||||
bool PrevTransition(time_point<sys_seconds>* tp) const override; |
||||
|
||||
private: |
||||
const bool local_; // localtime or UTC
|
||||
}; |
||||
|
||||
} // namespace cctz
|
||||
} // namespace time_internal
|
||||
} // namespace absl
|
||||
|
||||
#endif // ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_LIBC_H_
|
||||
@ -0,0 +1,142 @@ |
||||
// 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
|
||||
//
|
||||
// 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.
|
||||
|
||||
#include "absl/time/internal/cctz/include/cctz/time_zone.h" |
||||
|
||||
#if defined(__ANDROID__) |
||||
#include <sys/system_properties.h> |
||||
#if __ANDROID_API__ >= 21 |
||||
#include <dlfcn.h> |
||||
#endif |
||||
#endif |
||||
#include <cstdlib> |
||||
#include <cstring> |
||||
#include <string> |
||||
|
||||
#include "time_zone_fixed.h" |
||||
#include "time_zone_impl.h" |
||||
|
||||
namespace absl { |
||||
namespace time_internal { |
||||
namespace cctz { |
||||
|
||||
#if defined(__ANDROID__) && __ANDROID_API__ >= 21 |
||||
namespace { |
||||
// Android 'L' removes __system_property_get() from the NDK, however
|
||||
// it is still a hidden symbol in libc so we use dlsym() to access it.
|
||||
// See Chromium's base/sys_info_android.cc for a similar example.
|
||||
|
||||
using property_get_func = int (*)(const char*, char*); |
||||
|
||||
property_get_func LoadSystemPropertyGet() { |
||||
int flag = RTLD_LAZY | RTLD_GLOBAL; |
||||
#if defined(RTLD_NOLOAD) |
||||
flag |= RTLD_NOLOAD; // libc.so should already be resident
|
||||
#endif |
||||
if (void* handle = dlopen("libc.so", flag)) { |
||||
void* sym = dlsym(handle, "__system_property_get"); |
||||
dlclose(handle); |
||||
return reinterpret_cast<property_get_func>(sym); |
||||
} |
||||
return nullptr; |
||||
} |
||||
|
||||
int __system_property_get(const char* name, char* value) { |
||||
static property_get_func system_property_get = LoadSystemPropertyGet(); |
||||
return system_property_get ? system_property_get(name, value) : -1; |
||||
} |
||||
|
||||
} // namespace
|
||||
#endif |
||||
|
||||
std::string time_zone::name() const { |
||||
return time_zone::Impl::get(*this).name(); |
||||
} |
||||
|
||||
time_zone::absolute_lookup time_zone::lookup( |
||||
const time_point<sys_seconds>& tp) const { |
||||
return time_zone::Impl::get(*this).BreakTime(tp); |
||||
} |
||||
|
||||
time_zone::civil_lookup time_zone::lookup(const civil_second& cs) const { |
||||
return time_zone::Impl::get(*this).MakeTime(cs); |
||||
} |
||||
|
||||
bool operator==(time_zone lhs, time_zone rhs) { |
||||
return &time_zone::Impl::get(lhs) == &time_zone::Impl::get(rhs); |
||||
} |
||||
|
||||
bool load_time_zone(const std::string& name, time_zone* tz) { |
||||
return time_zone::Impl::LoadTimeZone(name, tz); |
||||
} |
||||
|
||||
time_zone utc_time_zone() { |
||||
return time_zone::Impl::UTC(); // avoid name lookup
|
||||
} |
||||
|
||||
time_zone fixed_time_zone(const sys_seconds& offset) { |
||||
time_zone tz; |
||||
load_time_zone(FixedOffsetToName(offset), &tz); |
||||
return tz; |
||||
} |
||||
|
||||
time_zone local_time_zone() { |
||||
const char* zone = ":localtime"; |
||||
|
||||
// Allow ${TZ} to override to default zone.
|
||||
char* tz_env = nullptr; |
||||
#if defined(_MSC_VER) |
||||
_dupenv_s(&tz_env, nullptr, "TZ"); |
||||
#else |
||||
tz_env = std::getenv("TZ"); |
||||
#endif |
||||
#if defined(__ANDROID__) |
||||
char sysprop[PROP_VALUE_MAX]; |
||||
if (tz_env == nullptr) |
||||
if (__system_property_get("persist.sys.timezone", sysprop) > 0) |
||||
tz_env = sysprop; |
||||
#endif |
||||
if (tz_env) zone = tz_env; |
||||
|
||||
// We only support the "[:]<zone-name>" form.
|
||||
if (*zone == ':') ++zone; |
||||
|
||||
// Map "localtime" to a system-specific name, but
|
||||
// allow ${LOCALTIME} to override the default name.
|
||||
char* localtime_env = nullptr; |
||||
if (strcmp(zone, "localtime") == 0) { |
||||
#if defined(_MSC_VER) |
||||
// System-specific default is just "localtime".
|
||||
_dupenv_s(&localtime_env, nullptr, "LOCALTIME"); |
||||
#else |
||||
zone = "/etc/localtime"; // System-specific default.
|
||||
localtime_env = std::getenv("LOCALTIME"); |
||||
#endif |
||||
if (localtime_env) zone = localtime_env; |
||||
} |
||||
|
||||
const std::string name = zone; |
||||
#if defined(_MSC_VER) |
||||
free(localtime_env); |
||||
free(tz_env); |
||||
#endif |
||||
|
||||
time_zone tz; |
||||
load_time_zone(name, &tz); // Falls back to UTC.
|
||||
return tz; |
||||
} |
||||
|
||||
} // namespace cctz
|
||||
} // namespace time_internal
|
||||
} // namespace absl
|
||||
File diff suppressed because it is too large
Load Diff
@ -0,0 +1,155 @@ |
||||
// 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
|
||||
//
|
||||
// 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.
|
||||
|
||||
#include "time_zone_posix.h" |
||||
|
||||
#include <cstddef> |
||||
#include <cstring> |
||||
#include <limits> |
||||
#include <string> |
||||
|
||||
namespace absl { |
||||
namespace time_internal { |
||||
namespace cctz { |
||||
|
||||
namespace { |
||||
|
||||
const char kDigits[] = "0123456789"; |
||||
|
||||
const char* ParseInt(const char* p, int min, int max, int* vp) { |
||||
int value = 0; |
||||
const char* op = p; |
||||
const int kMaxInt = std::numeric_limits<int>::max(); |
||||
for (; const char* dp = strchr(kDigits, *p); ++p) { |
||||
int d = static_cast<int>(dp - kDigits); |
||||
if (d >= 10) break; // '\0'
|
||||
if (value > kMaxInt / 10) return nullptr; |
||||
value *= 10; |
||||
if (value > kMaxInt - d) return nullptr; |
||||
value += d; |
||||
} |
||||
if (p == op || value < min || value > max) return nullptr; |
||||
*vp = value; |
||||
return p; |
||||
} |
||||
|
||||
// abbr = <.*?> | [^-+,\d]{3,}
|
||||
const char* ParseAbbr(const char* p, std::string* abbr) { |
||||
const char* op = p; |
||||
if (*p == '<') { // special zoneinfo <...> form
|
||||
while (*++p != '>') { |
||||
if (*p == '\0') return nullptr; |
||||
} |
||||
abbr->assign(op + 1, static_cast<std::size_t>(p - op) - 1); |
||||
return ++p; |
||||
} |
||||
while (*p != '\0') { |
||||
if (strchr("-+,", *p)) break; |
||||
if (strchr(kDigits, *p)) break; |
||||
++p; |
||||
} |
||||
if (p - op < 3) return nullptr; |
||||
abbr->assign(op, static_cast<std::size_t>(p - op)); |
||||
return p; |
||||
} |
||||
|
||||
// offset = [+|-]hh[:mm[:ss]] (aggregated into single seconds value)
|
||||
const char* ParseOffset(const char* p, int min_hour, int max_hour, int sign, |
||||
std::int_fast32_t* offset) { |
||||
if (p == nullptr) return nullptr; |
||||
if (*p == '+' || *p == '-') { |
||||
if (*p++ == '-') sign = -sign; |
||||
} |
||||
int hours = 0; |
||||
int minutes = 0; |
||||
int seconds = 0; |
||||
|
||||
p = ParseInt(p, min_hour, max_hour, &hours); |
||||
if (p == nullptr) return nullptr; |
||||
if (*p == ':') { |
||||
p = ParseInt(p + 1, 0, 59, &minutes); |
||||
if (p == nullptr) return nullptr; |
||||
if (*p == ':') { |
||||
p = ParseInt(p + 1, 0, 59, &seconds); |
||||
if (p == nullptr) return nullptr; |
||||
} |
||||
} |
||||
*offset = sign * ((((hours * 60) + minutes) * 60) + seconds); |
||||
return p; |
||||
} |
||||
|
||||
// datetime = ( Jn | n | Mm.w.d ) [ / offset ]
|
||||
const char* ParseDateTime(const char* p, PosixTransition* res) { |
||||
if (p != nullptr && *p == ',') { |
||||
if (*++p == 'M') { |
||||
int month = 0; |
||||
if ((p = ParseInt(p + 1, 1, 12, &month)) != nullptr && *p == '.') { |
||||
int week = 0; |
||||
if ((p = ParseInt(p + 1, 1, 5, &week)) != nullptr && *p == '.') { |
||||
int weekday = 0; |
||||
if ((p = ParseInt(p + 1, 0, 6, &weekday)) != nullptr) { |
||||
res->date.fmt = PosixTransition::M; |
||||
res->date.m.month = static_cast<int_fast8_t>(month); |
||||
res->date.m.week = static_cast<int_fast8_t>(week); |
||||
res->date.m.weekday = static_cast<int_fast8_t>(weekday); |
||||
} |
||||
} |
||||
} |
||||
} else if (*p == 'J') { |
||||
int day = 0; |
||||
if ((p = ParseInt(p + 1, 1, 365, &day)) != nullptr) { |
||||
res->date.fmt = PosixTransition::J; |
||||
res->date.j.day = static_cast<int_fast16_t>(day); |
||||
} |
||||
} else { |
||||
int day = 0; |
||||
if ((p = ParseInt(p, 0, 365, &day)) != nullptr) { |
||||
res->date.fmt = PosixTransition::N; |
||||
res->date.j.day = static_cast<int_fast16_t>(day); |
||||
} |
||||
} |
||||
} |
||||
if (p != nullptr) { |
||||
res->time.offset = 2 * 60 * 60; // default offset is 02:00:00
|
||||
if (*p == '/') p = ParseOffset(p + 1, -167, 167, 1, &res->time.offset); |
||||
} |
||||
return p; |
||||
} |
||||
|
||||
} // namespace
|
||||
|
||||
// spec = std offset [ dst [ offset ] , datetime , datetime ]
|
||||
bool ParsePosixSpec(const std::string& spec, PosixTimeZone* res) { |
||||
const char* p = spec.c_str(); |
||||
if (*p == ':') return false; |
||||
|
||||
p = ParseAbbr(p, &res->std_abbr); |
||||
p = ParseOffset(p, 0, 24, -1, &res->std_offset); |
||||
if (p == nullptr) return false; |
||||
if (*p == '\0') return true; |
||||
|
||||
p = ParseAbbr(p, &res->dst_abbr); |
||||
if (p == nullptr) return false; |
||||
res->dst_offset = res->std_offset + (60 * 60); // default
|
||||
if (*p != ',') p = ParseOffset(p, 0, 24, -1, &res->dst_offset); |
||||
|
||||
p = ParseDateTime(p, &res->dst_start); |
||||
p = ParseDateTime(p, &res->dst_end); |
||||
|
||||
return p != nullptr && *p == '\0'; |
||||
} |
||||
|
||||
} // namespace cctz
|
||||
} // namespace time_internal
|
||||
} // namespace absl
|
||||
@ -0,0 +1,118 @@ |
||||
// 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
|
||||
//
|
||||
// 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.
|
||||
|
||||
// Parsing of a POSIX zone spec as described in the TZ part of section 8.3 in
|
||||
// http://pubs.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap08.html.
|
||||
//
|
||||
// The current POSIX spec for America/Los_Angeles is "PST8PDT,M3.2.0,M11.1.0",
|
||||
// which would be broken down as ...
|
||||
//
|
||||
// PosixTimeZone {
|
||||
// std_abbr = "PST"
|
||||
// std_offset = -28800
|
||||
// dst_abbr = "PDT"
|
||||
// dst_offset = -25200
|
||||
// dst_start = PosixTransition {
|
||||
// date {
|
||||
// m {
|
||||
// month = 3
|
||||
// week = 2
|
||||
// weekday = 0
|
||||
// }
|
||||
// }
|
||||
// time {
|
||||
// offset = 7200
|
||||
// }
|
||||
// }
|
||||
// dst_end = PosixTransition {
|
||||
// date {
|
||||
// m {
|
||||
// month = 11
|
||||
// week = 1
|
||||
// weekday = 0
|
||||
// }
|
||||
// }
|
||||
// time {
|
||||
// offset = 7200
|
||||
// }
|
||||
// }
|
||||
// }
|
||||
|
||||
#ifndef ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_POSIX_H_ |
||||
#define ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_POSIX_H_ |
||||
|
||||
#include <cstdint> |
||||
#include <string> |
||||
|
||||
namespace absl { |
||||
namespace time_internal { |
||||
namespace cctz { |
||||
|
||||
// The date/time of the transition. The date is specified as either:
|
||||
// (J) the Nth day of the year (1 <= N <= 365), excluding leap days, or
|
||||
// (N) the Nth day of the year (0 <= N <= 365), including leap days, or
|
||||
// (M) the Nth weekday of a month (e.g., the 2nd Sunday in March).
|
||||
// The time, specified as a day offset, identifies the particular moment
|
||||
// of the transition, and may be negative or >= 24h, and in which case
|
||||
// it would take us to another day, and perhaps week, or even month.
|
||||
struct PosixTransition { |
||||
enum DateFormat { J, N, M }; |
||||
struct { |
||||
DateFormat fmt; |
||||
union { |
||||
struct { |
||||
std::int_fast16_t day; // day of non-leap year [1:365]
|
||||
} j; |
||||
struct { |
||||
std::int_fast16_t day; // day of year [0:365]
|
||||
} n; |
||||
struct { |
||||
std::int_fast8_t month; // month of year [1:12]
|
||||
std::int_fast8_t week; // week of month [1:5] (5==last)
|
||||
std::int_fast8_t weekday; // 0==Sun, ..., 6=Sat
|
||||
} m; |
||||
}; |
||||
} date; |
||||
struct { |
||||
std::int_fast32_t offset; // seconds before/after 00:00:00
|
||||
} time; |
||||
}; |
||||
|
||||
// The entirety of a POSIX-std::string specified time-zone rule. The standard
|
||||
// abbreviation and offset are always given. If the time zone includes
|
||||
// daylight saving, then the daylight abbrevation is non-empty and the
|
||||
// remaining fields are also valid. Note that the start/end transitions
|
||||
// are not ordered---in the southern hemisphere the transition to end
|
||||
// daylight time occurs first in any particular year.
|
||||
struct PosixTimeZone { |
||||
std::string std_abbr; |
||||
std::int_fast32_t std_offset; |
||||
|
||||
std::string dst_abbr; |
||||
std::int_fast32_t dst_offset; |
||||
PosixTransition dst_start; |
||||
PosixTransition dst_end; |
||||
}; |
||||
|
||||
// Breaks down a POSIX time-zone specification into its constituent pieces,
|
||||
// filling in any missing values (DST offset, or start/end transition times)
|
||||
// with the standard-defined defaults. Returns false if the specification
|
||||
// could not be parsed (although some fields of *res may have been altered).
|
||||
bool ParsePosixSpec(const std::string& spec, PosixTimeZone* res); |
||||
|
||||
} // namespace cctz
|
||||
} // namespace time_internal
|
||||
} // namespace absl
|
||||
|
||||
#endif // ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_POSIX_H_
|
||||
@ -0,0 +1,117 @@ |
||||
#ifndef TZFILE_H |
||||
|
||||
#define TZFILE_H |
||||
|
||||
/*
|
||||
** This file is in the public domain, so clarified as of |
||||
** 1996-06-05 by Arthur David Olson. |
||||
*/ |
||||
|
||||
/*
|
||||
** This header is for use ONLY with the time conversion code. |
||||
** There is no guarantee that it will remain unchanged, |
||||
** or that it will remain at all. |
||||
** Do NOT copy it to any system include directory. |
||||
** Thank you! |
||||
*/ |
||||
|
||||
/*
|
||||
** Information about time zone files. |
||||
*/ |
||||
|
||||
#ifndef TZDIR |
||||
#define TZDIR "/usr/share/zoneinfo" /* Time zone object file directory */ |
||||
#endif /* !defined TZDIR */ |
||||
|
||||
#ifndef TZDEFAULT |
||||
#define TZDEFAULT "/etc/localtime" |
||||
#endif /* !defined TZDEFAULT */ |
||||
|
||||
#ifndef TZDEFRULES |
||||
#define TZDEFRULES "posixrules" |
||||
#endif /* !defined TZDEFRULES */ |
||||
|
||||
/*
|
||||
** Each file begins with. . . |
||||
*/ |
||||
|
||||
#define TZ_MAGIC "TZif" |
||||
|
||||
struct tzhead { |
||||
char tzh_magic[4]; /* TZ_MAGIC */ |
||||
char tzh_version[1]; /* '\0' or '2' or '3' as of 2013 */ |
||||
char tzh_reserved[15]; /* reserved; must be zero */ |
||||
char tzh_ttisgmtcnt[4]; /* coded number of trans. time flags */ |
||||
char tzh_ttisstdcnt[4]; /* coded number of trans. time flags */ |
||||
char tzh_leapcnt[4]; /* coded number of leap seconds */ |
||||
char tzh_timecnt[4]; /* coded number of transition times */ |
||||
char tzh_typecnt[4]; /* coded number of local time types */ |
||||
char tzh_charcnt[4]; /* coded number of abbr. chars */ |
||||
}; |
||||
|
||||
/*
|
||||
** . . .followed by. . . |
||||
** |
||||
** tzh_timecnt (char [4])s coded transition times a la time(2) |
||||
** tzh_timecnt (unsigned char)s types of local time starting at above |
||||
** tzh_typecnt repetitions of |
||||
** one (char [4]) coded UT offset in seconds |
||||
** one (unsigned char) used to set tm_isdst |
||||
** one (unsigned char) that's an abbreviation list index |
||||
** tzh_charcnt (char)s '\0'-terminated zone abbreviations |
||||
** tzh_leapcnt repetitions of |
||||
** one (char [4]) coded leap second transition times |
||||
** one (char [4]) total correction after above |
||||
** tzh_ttisstdcnt (char)s indexed by type; if 1, transition |
||||
** time is standard time, if 0, |
||||
** transition time is wall clock time |
||||
** if absent, transition times are |
||||
** assumed to be wall clock time |
||||
** tzh_ttisgmtcnt (char)s indexed by type; if 1, transition |
||||
** time is UT, if 0, |
||||
** transition time is local time |
||||
** if absent, transition times are |
||||
** assumed to be local time |
||||
*/ |
||||
|
||||
/*
|
||||
** If tzh_version is '2' or greater, the above is followed by a second instance |
||||
** of tzhead and a second instance of the data in which each coded transition |
||||
** time uses 8 rather than 4 chars, |
||||
** then a POSIX-TZ-environment-variable-style std::string for use in handling |
||||
** instants after the last transition time stored in the file |
||||
** (with nothing between the newlines if there is no POSIX representation for |
||||
** such instants). |
||||
** |
||||
** If tz_version is '3' or greater, the above is extended as follows. |
||||
** First, the POSIX TZ std::string's hour offset may range from -167 |
||||
** through 167 as compared to the POSIX-required 0 through 24. |
||||
** Second, its DST start time may be January 1 at 00:00 and its stop |
||||
** time December 31 at 24:00 plus the difference between DST and |
||||
** standard time, indicating DST all year. |
||||
*/ |
||||
|
||||
/*
|
||||
** In the current implementation, "tzset()" refuses to deal with files that |
||||
** exceed any of the limits below. |
||||
*/ |
||||
|
||||
#ifndef TZ_MAX_TIMES |
||||
#define TZ_MAX_TIMES 2000 |
||||
#endif /* !defined TZ_MAX_TIMES */ |
||||
|
||||
#ifndef TZ_MAX_TYPES |
||||
/* This must be at least 17 for Europe/Samara and Europe/Vilnius. */ |
||||
#define TZ_MAX_TYPES 256 /* Limited by what (unsigned char)'s can hold */ |
||||
#endif /* !defined TZ_MAX_TYPES */ |
||||
|
||||
#ifndef TZ_MAX_CHARS |
||||
#define TZ_MAX_CHARS 50 /* Maximum number of abbreviation characters */ |
||||
/* (limited by what unsigned chars can hold) */ |
||||
#endif /* !defined TZ_MAX_CHARS */ |
||||
|
||||
#ifndef TZ_MAX_LEAPS |
||||
#define TZ_MAX_LEAPS 50 /* Maximum number of leap second corrections */ |
||||
#endif /* !defined TZ_MAX_LEAPS */ |
||||
|
||||
#endif /* !defined TZFILE_H */ |
||||
@ -0,0 +1,70 @@ |
||||
// 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
|
||||
//
|
||||
// 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.
|
||||
|
||||
#include "absl/time/internal/cctz/include/cctz/zone_info_source.h" |
||||
|
||||
namespace absl { |
||||
namespace time_internal { |
||||
namespace cctz { |
||||
|
||||
// Defined out-of-line to avoid emitting a weak vtable in all TUs.
|
||||
ZoneInfoSource::~ZoneInfoSource() {} |
||||
|
||||
} // namespace cctz
|
||||
} // namespace time_internal
|
||||
} // namespace absl
|
||||
|
||||
namespace absl { |
||||
namespace time_internal { |
||||
namespace cctz_extension { |
||||
|
||||
namespace { |
||||
|
||||
// A default for cctz_extension::zone_info_source_factory, which simply
|
||||
// defers to the fallback factory.
|
||||
std::unique_ptr<absl::time_internal::cctz::ZoneInfoSource> DefaultFactory( |
||||
const std::string& name, |
||||
const std::function<std::unique_ptr<absl::time_internal::cctz::ZoneInfoSource>( |
||||
const std::string& name)>& fallback_factory) { |
||||
return fallback_factory(name); |
||||
} |
||||
|
||||
} // namespace
|
||||
|
||||
// A "weak" definition for cctz_extension::zone_info_source_factory.
|
||||
// The user may override this with their own "strong" definition (see
|
||||
// zone_info_source.h).
|
||||
#if defined(_MSC_VER) |
||||
extern ZoneInfoSourceFactory zone_info_source_factory; |
||||
extern ZoneInfoSourceFactory default_factory; |
||||
ZoneInfoSourceFactory default_factory = DefaultFactory; |
||||
#if defined(_M_IX86) |
||||
#pragma comment( \ |
||||
linker, \
|
||||
"/alternatename:?zone_info_source_factory@cctz_extension@time_internal@absl@@3P6A?AV?$unique_ptr@VZoneInfoSource@cctz@time_internal@absl@@U?$default_delete@VZoneInfoSource@cctz@time_internal@absl@@@std@@@std@@ABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@5@ABV?$function@$$A6A?AV?$unique_ptr@VZoneInfoSource@cctz@time_internal@absl@@U?$default_delete@VZoneInfoSource@cctz@time_internal@absl@@@std@@@std@@ABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@2@@Z@5@@ZA=?default_factory@cctz_extension@time_internal@absl@@3P6A?AV?$unique_ptr@VZoneInfoSource@cctz@time_internal@absl@@U?$default_delete@VZoneInfoSource@cctz@time_internal@absl@@@std@@@std@@ABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@5@ABV?$function@$$A6A?AV?$unique_ptr@VZoneInfoSource@cctz@time_internal@absl@@U?$default_delete@VZoneInfoSource@cctz@time_internal@absl@@@std@@@std@@ABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@2@@Z@5@@ZA") |
||||
#elif defined(_M_IA_64) || defined(_M_AMD64) |
||||
#pragma comment( \ |
||||
linker, \
|
||||
"/alternatename:?zone_info_source_factory@cctz_extension@time_internal@absl@@3P6A?AV?$unique_ptr@VZoneInfoSource@cctz@time_internal@absl@@U?$default_delete@VZoneInfoSource@cctz@time_internal@absl@@@std@@@std@@AEBV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@5@AEBV?$function@$$A6A?AV?$unique_ptr@VZoneInfoSource@cctz@time_internal@absl@@U?$default_delete@VZoneInfoSource@cctz@time_internal@absl@@@std@@@std@@AEBV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@2@@Z@5@@ZEA=?default_factory@cctz_extension@time_internal@absl@@3P6A?AV?$unique_ptr@VZoneInfoSource@cctz@time_internal@absl@@U?$default_delete@VZoneInfoSource@cctz@time_internal@absl@@@std@@@std@@AEBV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@5@AEBV?$function@$$A6A?AV?$unique_ptr@VZoneInfoSource@cctz@time_internal@absl@@U?$default_delete@VZoneInfoSource@cctz@time_internal@absl@@@std@@@std@@AEBV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@2@@Z@5@@ZEA") |
||||
#else |
||||
#error Unsupported MSVC platform |
||||
#endif |
||||
#else |
||||
ZoneInfoSourceFactory zone_info_source_factory |
||||
__attribute__((weak)) = DefaultFactory; |
||||
#endif // _MSC_VER
|
||||
|
||||
} // namespace cctz_extension
|
||||
} // namespace time_internal
|
||||
} // namespace absl
|
||||
@ -0,0 +1,37 @@ |
||||
testdata/zoneinfo contains time-zone data files that may be used with CCTZ. |
||||
Install them in a location referenced by the ${TZDIR} environment variable. |
||||
Symbolic and hard links have been eliminated for portability. |
||||
|
||||
On Linux systems the distribution's versions of these files can probably |
||||
already be found in the default ${TZDIR} location, /usr/share/zoneinfo. |
||||
|
||||
New versions can be generated using the following shell script. |
||||
|
||||
#!/bin/sh - |
||||
set -e |
||||
DESTDIR=$(mktemp -d) |
||||
trap "rm -fr ${DESTDIR}" 0 2 15 |
||||
( |
||||
cd ${DESTDIR} |
||||
git clone https://github.com/eggert/tz.git |
||||
make --directory=tz \ |
||||
install DESTDIR=${DESTDIR} \ |
||||
DATAFORM=vanguard \ |
||||
TZDIR=/zoneinfo \ |
||||
REDO=posix_only \ |
||||
LOCALTIME=Factory \ |
||||
TZDATA_TEXT= \ |
||||
ZONETABLES=zone1970.tab |
||||
tar --create --dereference --hard-dereference --file tzfile.tar \ |
||||
--directory=tz tzfile.h |
||||
tar --create --dereference --hard-dereference --file zoneinfo.tar \ |
||||
--exclude=zoneinfo/posixrules zoneinfo \ |
||||
--directory=tz version |
||||
) |
||||
tar --extract --directory src --file ${DESTDIR}/tzfile.tar |
||||
tar --extract --directory testdata --file ${DESTDIR}/zoneinfo.tar |
||||
exit 0 |
||||
|
||||
To run the CCTZ tests using the testdata/zoneinfo files, execute: |
||||
|
||||
bazel test --test_env=TZDIR=${PWD}/testdata/zoneinfo ... |
||||
@ -0,0 +1 @@ |
||||
2018d-2-g8d1dac0 |
||||
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Reference in new issue