Fuchsia port of base/time, with some refactoring of POSIX time modules.

base/time/time_conversion_posix.cc

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/time/time.h"
+
+#include <stdint.h>
+#include <sys/time.h>
+#include <time.h>
+
+#include <limits>
+
+#include "base/logging.h"
+
+namespace base {
+
+// static
+TimeDelta TimeDelta::FromTimeSpec(const timespec& ts) {
+  return TimeDelta(ts.tv_sec * Time::kMicrosecondsPerSecond +
+                   ts.tv_nsec / Time::kNanosecondsPerMicrosecond);
+}
+
+struct timespec TimeDelta::ToTimeSpec() const {
+  int64_t microseconds = InMicroseconds();
+  time_t seconds = 0;
+  if (microseconds >= Time::kMicrosecondsPerSecond) {
+    seconds = InSeconds();
+    microseconds -= seconds * Time::kMicrosecondsPerSecond;
+  }
+  struct timespec result = {
+      seconds,
+      static_cast<long>(microseconds * Time::kNanosecondsPerMicrosecond)};
+  return result;
+}
+
+// static
+Time Time::FromTimeVal(struct timeval t) {
+  DCHECK_LT(t.tv_usec, static_cast<int>(Time::kMicrosecondsPerSecond));
+  DCHECK_GE(t.tv_usec, 0);
+  if (t.tv_usec == 0 && t.tv_sec == 0)
+    return Time();
+  if (t.tv_usec == static_cast<suseconds_t>(Time::kMicrosecondsPerSecond) - 1 &&
+      t.tv_sec == std::numeric_limits<time_t>::max())
+    return Max();
+  return Time((static_cast<int64_t>(t.tv_sec) * Time::kMicrosecondsPerSecond) +
+              t.tv_usec + kTimeTToMicrosecondsOffset);
+}
+
+struct timeval Time::ToTimeVal() const {
+  struct timeval result;
+  if (is_null()) {
+    result.tv_sec = 0;
+    result.tv_usec = 0;
+    return result;
+  }
+  if (is_max()) {
+    result.tv_sec = std::numeric_limits<time_t>::max();
+    result.tv_usec = static_cast<suseconds_t>(Time::kMicrosecondsPerSecond) - 1;
+    return result;
+  }
+  int64_t us = us_ - kTimeTToMicrosecondsOffset;
+  result.tv_sec = us / Time::kMicrosecondsPerSecond;
+  result.tv_usec = us % Time::kMicrosecondsPerSecond;
+  return result;
+}
+
+}  // namespace base