/***************************************************************************

 *                                  _   _ ____  _

 *  Project                     ___| | | |  _ \| |

 *                             / __| | | | |_) | |

 *                            | (__| |_| |  _ <| |___

 *                             \___|\___/|_| \_\_____|

 *

 * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.

 *

 * This software is licensed as described in the file COPYING, which

 * you should have received as part of this distribution. The terms

 * are also available at https://curl.se/docs/copyright.html.

 *

 * You may opt to use, copy, modify, merge, publish, distribute and/or sell

 * copies of the Software, and permit persons to whom the Software is

 * furnished to do so, under the terms of the COPYING file.

 *

 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY

 * KIND, either express or implied.

 *

 * SPDX-License-Identifier: curl

 *

 ***************************************************************************/

#include "timeval.h"

#if defined(WIN32) && !defined(MSDOS)

/* set in win32_init() */

extern LARGE_INTEGER Curl_freq;

extern bool Curl_isVistaOrGreater;

/* In case of bug fix this function has a counterpart in tool_util.c */

struct curltime Curl_now(void)

{

  struct curltime now;

  if(Curl_isVistaOrGreater) { /* QPC timer might have issues pre-Vista */

    LARGE_INTEGER count;

    QueryPerformanceCounter(&count);

    now.tv_sec = (time_t)(count.QuadPart / Curl_freq.QuadPart);

    now.tv_usec = (int)((count.QuadPart % Curl_freq.QuadPart) * 1000000 /

                        Curl_freq.QuadPart);

  }

  else {

    /* Disable /analyze warning that GetTickCount64 is preferred  */

#if defined(_MSC_VER)

#pragma warning(push)

#pragma warning(disable:28159)

#endif

    DWORD milliseconds = GetTickCount();

#if defined(_MSC_VER)

#pragma warning(pop)

#endif

    now.tv_sec = milliseconds / 1000;

    now.tv_usec = (milliseconds % 1000) * 1000;

  }

  return now;

}

#elif defined(HAVE_CLOCK_GETTIME_MONOTONIC)

struct curltime Curl_now(void)

{

  /*

  ** clock_gettime() is granted to be increased monotonically when the

  ** monotonic clock is queried. Time starting point is unspecified, it

  ** could be the system start-up time, the Epoch, or something else,

  ** in any case the time starting point does not change once that the

  ** system has started up.

  */

#ifdef HAVE_GETTIMEOFDAY

  struct timeval now;

#endif

  struct curltime cnow;

  struct timespec tsnow;

  /*

  ** clock_gettime() may be defined by Apple's SDK as weak symbol thus

  ** code compiles but fails during run-time if clock_gettime() is

  ** called on unsupported OS version.

  */

#if defined(__APPLE__) && defined(HAVE_BUILTIN_AVAILABLE) && \

        (HAVE_BUILTIN_AVAILABLE == 1)

  bool have_clock_gettime = FALSE;

  if(__builtin_available(macOS 10.12, iOS 10, tvOS 10, watchOS 3, *))

    have_clock_gettime = TRUE;

#endif

  if(

#if defined(__APPLE__) && defined(HAVE_BUILTIN_AVAILABLE) && \

        (HAVE_BUILTIN_AVAILABLE == 1)

    have_clock_gettime &&

#endif

    (0 == clock_gettime(CLOCK_MONOTONIC, &tsnow))) {

    cnow.tv_sec = tsnow.tv_sec;

    cnow.tv_usec = (unsigned int)(tsnow.tv_nsec / 1000);

  }

  /*

  ** Even when the configure process has truly detected monotonic clock

  ** availability, it might happen that it is not actually available at

  ** run-time. When this occurs simply fallback to other time source.

  */

#ifdef HAVE_GETTIMEOFDAY

  else {

    (void)gettimeofday(&now, NULL);

    cnow.tv_sec = now.tv_sec;

    cnow.tv_usec = (unsigned int)now.tv_usec;

  }

#else

  else {

    cnow.tv_sec = time(NULL);

    cnow.tv_usec = 0;

  }

#endif

  return cnow;

}

#elif defined(HAVE_MACH_ABSOLUTE_TIME)

#include <stdint.h>

#include <mach/mach_time.h>

struct curltime Curl_now(void)

{

  /*

  ** Monotonic timer on Mac OS is provided by mach_absolute_time(), which

  ** returns time in Mach "absolute time units," which are platform-dependent.

  ** To convert to nanoseconds, one must use conversion factors specified by

  ** mach_timebase_info().

  */

  static mach_timebase_info_data_t timebase;

  struct curltime cnow;

  uint64_t usecs;

  if(0 == timebase.denom)

    (void) mach_timebase_info(&timebase);

  usecs = mach_absolute_time();

  usecs *= timebase.numer;

  usecs /= timebase.denom;

  usecs /= 1000;

  cnow.tv_sec = usecs / 1000000;

  cnow.tv_usec = (int)(usecs % 1000000);

  return cnow;

}

#elif defined(HAVE_GETTIMEOFDAY)

struct curltime Curl_now(void)

{

  /*

  ** gettimeofday() is not granted to be increased monotonically, due to

  ** clock drifting and external source time synchronization it can jump

  ** forward or backward in time.

  */

  struct timeval now;

  struct curltime ret;

  (void)gettimeofday(&now, NULL);

  ret.tv_sec = now.tv_sec;

  ret.tv_usec = (int)now.tv_usec;

  return ret;

}

#else

struct curltime Curl_now(void)

{

  /*

  ** time() returns the value of time in seconds since the Epoch.

  */

  struct curltime now;

  now.tv_sec = time(NULL);

  now.tv_usec = 0;

  return now;

}

#endif

/*

 * Returns: time difference in number of milliseconds. For too large diffs it

 * returns max value.

 *

 * @unittest: 1323

 */

timediff_t Curl_timediff(struct curltime newer, struct curltime older)

{

  timediff_t diff = (timediff_t)newer.tv_sec-older.tv_sec;

  if(diff >= (TIMEDIFF_T_MAX/1000))

    return TIMEDIFF_T_MAX;

  else if(diff <= (TIMEDIFF_T_MIN/1000))

    return TIMEDIFF_T_MIN;

  return diff * 1000 + (newer.tv_usec-older.tv_usec)/1000;

}

/*

 * Returns: time difference in number of microseconds. For too large diffs it

 * returns max value.

 */

timediff_t Curl_timediff_us(struct curltime newer, struct curltime older)

{

  timediff_t diff = (timediff_t)newer.tv_sec-older.tv_sec;

  if(diff >= (TIMEDIFF_T_MAX/1000000))

    return TIMEDIFF_T_MAX;

  else if(diff <= (TIMEDIFF_T_MIN/1000000))

    return TIMEDIFF_T_MIN;

  return diff * 1000000 + newer.tv_usec-older.tv_usec;

}