text: /*
   * Copyright (C) 2013 The Android Open Source Project
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *  * Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *  * Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
   * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
   * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
   * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
   * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
   * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   */
  
  #include "private/bionic_time_conversions.h"
  
  #include "private/bionic_constants.h"
  
  bool timespec_from_timeval(timespec& ts, const timeval& tv) {
    // Whole seconds can just be copied.
    ts.tv_sec = tv.tv_sec;
  
    // But we might overflow when converting microseconds to nanoseconds.
    if (tv.tv_usec >= 1000000 || tv.tv_usec < 0) {
      return false;
    }
    ts.tv_nsec = tv.tv_usec * 1000;
    return true;
  }
  
  void timespec_from_ms(timespec& ts, const int ms) {
    ts.tv_sec = ms / 1000;
    ts.tv_nsec = (ms % 1000) * 1000000;
  }
  
  void timeval_from_timespec(timeval& tv, const timespec& ts) {
    tv.tv_sec = ts.tv_sec;
    tv.tv_usec = ts.tv_nsec / 1000;
  }
  
  void monotonic_time_from_realtime_time(timespec& monotonic_time, const timespec& realtime_time) {
    monotonic_time = realtime_time;
  
    timespec cur_monotonic_time;
    clock_gettime(CLOCK_MONOTONIC, &cur_monotonic_time);
    timespec cur_realtime_time;
    clock_gettime(CLOCK_REALTIME, &cur_realtime_time);
  
    monotonic_time.tv_nsec -= cur_realtime_time.tv_nsec;
    monotonic_time.tv_nsec += cur_monotonic_time.tv_nsec;
    if (monotonic_time.tv_nsec >= NS_PER_S) {
      monotonic_time.tv_nsec -= NS_PER_S;
      monotonic_time.tv_sec += 1;
    } else if (monotonic_time.tv_nsec < 0) {
      monotonic_time.tv_nsec += NS_PER_S;
      monotonic_time.tv_sec -= 1;
    }
    monotonic_time.tv_sec -= cur_realtime_time.tv_sec;
    monotonic_time.tv_sec += cur_monotonic_time.tv_sec;
  }
  