141 lines
3.6 KiB
C++
141 lines
3.6 KiB
C++
// Formatting library for C++ - time formatting
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//
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// Copyright (c) 2012 - 2016, Victor Zverovich
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// All rights reserved.
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//
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// For the license information refer to format.h.
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#ifndef FMT_TIME_H_
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#define FMT_TIME_H_
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#include "format.h"
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#include <ctime>
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namespace fmt {
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namespace internal{
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inline null<> localtime_r(...) { return null<>(); }
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inline null<> localtime_s(...) { return null<>(); }
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inline null<> gmtime_r(...) { return null<>(); }
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inline null<> gmtime_s(...) { return null<>(); }
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}
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// Thread-safe replacement for std::localtime
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inline std::tm localtime(std::time_t time) {
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struct LocalTime {
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std::time_t time_;
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std::tm tm_;
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LocalTime(std::time_t t): time_(t) {}
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bool run() {
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using namespace fmt::internal;
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return handle(localtime_r(&time_, &tm_));
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}
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bool handle(std::tm *tm) { return tm != FMT_NULL; }
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bool handle(internal::null<>) {
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using namespace fmt::internal;
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return fallback(localtime_s(&tm_, &time_));
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}
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bool fallback(int res) { return res == 0; }
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bool fallback(internal::null<>) {
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using namespace fmt::internal;
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std::tm *tm = std::localtime(&time_);
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if (tm) tm_ = *tm;
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return tm != FMT_NULL;
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}
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};
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LocalTime lt(time);
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if (lt.run())
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return lt.tm_;
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// Too big time values may be unsupported.
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FMT_THROW(format_error("time_t value out of range"));
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return std::tm();
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}
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// Thread-safe replacement for std::gmtime
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inline std::tm gmtime(std::time_t time) {
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struct GMTime {
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std::time_t time_;
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std::tm tm_;
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GMTime(std::time_t t): time_(t) {}
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bool run() {
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using namespace fmt::internal;
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return handle(gmtime_r(&time_, &tm_));
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}
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bool handle(std::tm *tm) { return tm != FMT_NULL; }
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bool handle(internal::null<>) {
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using namespace fmt::internal;
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return fallback(gmtime_s(&tm_, &time_));
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}
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bool fallback(int res) { return res == 0; }
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bool fallback(internal::null<>) {
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std::tm *tm = std::gmtime(&time_);
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if (tm) tm_ = *tm;
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return tm != FMT_NULL;
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}
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};
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GMTime gt(time);
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if (gt.run())
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return gt.tm_;
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// Too big time values may be unsupported.
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FMT_THROW(format_error("time_t value out of range"));
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return std::tm();
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}
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template <>
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struct formatter<std::tm> {
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template <typename ParseContext>
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auto parse(ParseContext &ctx) -> decltype(ctx.begin()) {
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auto it = internal::null_terminating_iterator<char>(ctx);
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if (*it == ':')
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++it;
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auto end = it;
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while (*end && *end != '}')
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++end;
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tm_format.reserve(end - it + 1);
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using internal::pointer_from;
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tm_format.append(pointer_from(it), pointer_from(end));
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tm_format.push_back('\0');
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return pointer_from(end);
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}
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auto format(const std::tm &tm, context &ctx) -> decltype(ctx.begin()) {
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internal::buffer &buf = internal::get_container(ctx.begin());
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std::size_t start = buf.size();
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for (;;) {
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std::size_t size = buf.capacity() - start;
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std::size_t count = std::strftime(&buf[start], size, &tm_format[0], &tm);
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if (count != 0) {
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buf.resize(start + count);
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break;
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}
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if (size >= tm_format.size() * 256) {
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// If the buffer is 256 times larger than the format string, assume
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// that `strftime` gives an empty result. There doesn't seem to be a
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// better way to distinguish the two cases:
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// https://github.com/fmtlib/fmt/issues/367
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break;
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}
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const std::size_t MIN_GROWTH = 10;
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buf.reserve(buf.capacity() + (size > MIN_GROWTH ? size : MIN_GROWTH));
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}
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return ctx.begin();
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}
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memory_buffer tm_format;
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};
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}
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#endif // FMT_TIME_H_
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