/* GLIB - Library of useful routines for C programming

 * Copyright (C) 1995-1997  Peter Mattis, Spencer Kimball and Josh MacDonald

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 *

 * This library is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with this library; if not, see <http://www.gnu.org/licenses/>.

 */

/*

 * Modified by the GLib Team and others 1997-2000.  See the AUTHORS

 * file for a list of people on the GLib Team.  See the ChangeLog

 * files for a list of changes.  These files are distributed with

 * GLib at ftp://ftp.gtk.org/pub/gtk/.

 */

/*

 * MT safe

 */

#include "config.h"

#include "glibconfig.h"

#include <stdlib.h>

#ifdef G_OS_UNIX

#include <unistd.h>

#endif /* G_OS_UNIX */

#ifdef HAVE_SYS_TIME_H

#include <sys/time.h>

#endif

#include <time.h>

#ifndef G_OS_WIN32

#include <errno.h>

#endif /* G_OS_WIN32 */

#ifdef G_OS_WIN32

#include <windows.h>

#endif /* G_OS_WIN32 */

#include "gtimer.h"

#include "gmem.h"

#include "gstrfuncs.h"

#include "gtestutils.h"

#include "gmain.h"

/**

 * SECTION:timers

 * @title: Timers

 * @short_description: keep track of elapsed time

 *

 * #GTimer records a start time, and counts microseconds elapsed since

 * that time. This is done somewhat differently on different platforms,

 * and can be tricky to get exactly right, so #GTimer provides a

 * portable/convenient interface.

 **/

/**

 * GTimer:

 *

 * Opaque datatype that records a start time.

 **/

struct _GTimer

{

  guint64 start;

  guint64 end;

  guint active : 1;

};

/**

 * g_timer_new:

 *

 * Creates a new timer, and starts timing (i.e. g_timer_start() is

 * implicitly called for you).

 *

 * Returns: a new #GTimer.

 **/

GTimer*

g_timer_new (void)

{

  GTimer *timer;

  timer = g_new (GTimer, 1);

  timer->active = TRUE;

  timer->start = g_get_monotonic_time ();

  return timer;

}

/**

 * g_timer_destroy:

 * @timer: a #GTimer to destroy.

 *

 * Destroys a timer, freeing associated resources.

 **/

void

g_timer_destroy (GTimer *timer)

{

  g_return_if_fail (timer != NULL);

  g_free (timer);

}

/**

 * g_timer_start:

 * @timer: a #GTimer.

 *

 * Marks a start time, so that future calls to g_timer_elapsed() will

 * report the time since g_timer_start() was called. g_timer_new()

 * automatically marks the start time, so no need to call

 * g_timer_start() immediately after creating the timer.

 **/

void

g_timer_start (GTimer *timer)

{

  g_return_if_fail (timer != NULL);

  timer->active = TRUE;

  timer->start = g_get_monotonic_time ();

}

/**

 * g_timer_stop:

 * @timer: a #GTimer.

 *

 * Marks an end time, so calls to g_timer_elapsed() will return the

 * difference between this end time and the start time.

 **/

void

g_timer_stop (GTimer *timer)

{

  g_return_if_fail (timer != NULL);

  timer->active = FALSE;

  timer->end = g_get_monotonic_time ();

}

/**

 * g_timer_reset:

 * @timer: a #GTimer.

 *

 * This function is useless; it's fine to call g_timer_start() on an

 * already-started timer to reset the start time, so g_timer_reset()

 * serves no purpose.

 **/

void

g_timer_reset (GTimer *timer)

{

  g_return_if_fail (timer != NULL);

  timer->start = g_get_monotonic_time ();

}

/**

 * g_timer_continue:

 * @timer: a #GTimer.

 *

 * Resumes a timer that has previously been stopped with

 * g_timer_stop(). g_timer_stop() must be called before using this

 * function.

 *

 * Since: 2.4

 **/

void

g_timer_continue (GTimer *timer)

{

  guint64 elapsed;

  g_return_if_fail (timer != NULL);

  g_return_if_fail (timer->active == FALSE);

  /* Get elapsed time and reset timer start time

   *  to the current time minus the previously

   *  elapsed interval.

   */

  elapsed = timer->end - timer->start;

  timer->start = g_get_monotonic_time ();

  timer->start -= elapsed;

  timer->active = TRUE;

}

/**

 * g_timer_elapsed:

 * @timer: a #GTimer.

 * @microseconds: return location for the fractional part of seconds

 *                elapsed, in microseconds (that is, the total number

 *                of microseconds elapsed, modulo 1000000), or %NULL

 *

 * If @timer has been started but not stopped, obtains the time since

 * the timer was started. If @timer has been stopped, obtains the

 * elapsed time between the time it was started and the time it was

 * stopped. The return value is the number of seconds elapsed,

 * including any fractional part. The @microseconds out parameter is

 * essentially useless.

 *

 * Returns: seconds elapsed as a floating point value, including any

 *          fractional part.

 **/

gdouble

g_timer_elapsed (GTimer *timer,

		 gulong *microseconds)

{

  gdouble total;

  gint64 elapsed;

  g_return_val_if_fail (timer != NULL, 0);

  if (timer->active)

    timer->end = g_get_monotonic_time ();

  elapsed = timer->end - timer->start;

  total = elapsed / 1e6;

  if (microseconds)

    *microseconds = elapsed % 1000000;

  return total;

}

/**

 * g_usleep:

 * @microseconds: number of microseconds to pause

 *

 * Pauses the current thread for the given number of microseconds.

 *

 * There are 1 million microseconds per second (represented by the

 * #G_USEC_PER_SEC macro). g_usleep() may have limited precision,

 * depending on hardware and operating system; don't rely on the exact

 * length of the sleep.

 */

void

g_usleep (gulong microseconds)

{

#ifdef G_OS_WIN32

  Sleep (microseconds / 1000);

#else

  struct timespec request, remaining;

  request.tv_sec = microseconds / G_USEC_PER_SEC;

  request.tv_nsec = 1000 * (microseconds % G_USEC_PER_SEC);

  while (nanosleep (&request, &remaining) == -1 && errno == EINTR)

    request = remaining;

#endif

}

/**

 * g_time_val_add:

 * @time_: a #GTimeVal

 * @microseconds: number of microseconds to add to @time

 *

 * Adds the given number of microseconds to @time_. @microseconds can

 * also be negative to decrease the value of @time_.

 **/

void 

g_time_val_add (GTimeVal *time_, glong microseconds)

{

  g_return_if_fail (time_->tv_usec >= 0 && time_->tv_usec < G_USEC_PER_SEC);

  if (microseconds >= 0)

    {

      time_->tv_usec += microseconds % G_USEC_PER_SEC;

      time_->tv_sec += microseconds / G_USEC_PER_SEC;

      if (time_->tv_usec >= G_USEC_PER_SEC)

       {

         time_->tv_usec -= G_USEC_PER_SEC;

         time_->tv_sec++;

       }

    }

  else

    {

      microseconds *= -1;

      time_->tv_usec -= microseconds % G_USEC_PER_SEC;

      time_->tv_sec -= microseconds / G_USEC_PER_SEC;

      if (time_->tv_usec < 0)

       {

         time_->tv_usec += G_USEC_PER_SEC;

         time_->tv_sec--;

       }      

    }

}

/* converts a broken down date representation, relative to UTC,

 * to a timestamp; it uses timegm() if it's available.

 */

static time_t

mktime_utc (struct tm *tm)

{

  time_t retval;

#ifndef HAVE_TIMEGM

  static const gint days_before[] =

  {

    0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334

  };

#endif

#ifndef HAVE_TIMEGM

  if (tm->tm_mon < 0 || tm->tm_mon > 11)

    return (time_t) -1;

  retval = (tm->tm_year - 70) * 365;

  retval += (tm->tm_year - 68) / 4;

  retval += days_before[tm->tm_mon] + tm->tm_mday - 1;

  if (tm->tm_year % 4 == 0 && tm->tm_mon < 2)

    retval -= 1;

  retval = ((((retval * 24) + tm->tm_hour) * 60) + tm->tm_min) * 60 + tm->tm_sec;

#else

  retval = timegm (tm);

#endif /* !HAVE_TIMEGM */

  return retval;

}

/**

 * g_time_val_from_iso8601:

 * @iso_date: an ISO 8601 encoded date string

 * @time_: (out): a #GTimeVal

 *

 * Converts a string containing an ISO 8601 encoded date and time

 * to a #GTimeVal and puts it into @time_.

 *

 * @iso_date must include year, month, day, hours, minutes, and

 * seconds. It can optionally include fractions of a second and a time

 * zone indicator. (In the absence of any time zone indication, the

 * timestamp is assumed to be in local time.)

 *

 * Returns: %TRUE if the conversion was successful.

 *

 * Since: 2.12

 */

gboolean

g_time_val_from_iso8601 (const gchar *iso_date,

			 GTimeVal    *time_)

{

  struct tm tm = {0};

  long val;

  g_return_val_if_fail (iso_date != NULL, FALSE);

  g_return_val_if_fail (time_ != NULL, FALSE);

  /* Ensure that the first character is a digit, the first digit

   * of the date, otherwise we don't have an ISO 8601 date

   */

  while (g_ascii_isspace (*iso_date))

    iso_date++;

  if (*iso_date == '\0')

    return FALSE;

  if (!g_ascii_isdigit (*iso_date) && *iso_date != '-' && *iso_date != '+')

    return FALSE;

  val = strtoul (iso_date, (char **)&iso_date, 10);

  if (*iso_date == '-')

    {

      /* YYYY-MM-DD */

      tm.tm_year = val - 1900;

      iso_date++;

      tm.tm_mon = strtoul (iso_date, (char **)&iso_date, 10) - 1;

      if (*iso_date++ != '-')

        return FALSE;

      tm.tm_mday = strtoul (iso_date, (char **)&iso_date, 10);

    }

  else

    {

      /* YYYYMMDD */

      tm.tm_mday = val % 100;

      tm.tm_mon = (val % 10000) / 100 - 1;

      tm.tm_year = val / 10000 - 1900;

    }

  if (*iso_date != 'T')

    return FALSE;

  iso_date++;

  /* If there is a 'T' then there has to be a time */

  if (!g_ascii_isdigit (*iso_date))

    return FALSE;

  val = strtoul (iso_date, (char **)&iso_date, 10);

  if (*iso_date == ':')

    {

      /* hh:mm:ss */

      tm.tm_hour = val;

      iso_date++;

      tm.tm_min = strtoul (iso_date, (char **)&iso_date, 10);

      if (*iso_date++ != ':')

        return FALSE;

      tm.tm_sec = strtoul (iso_date, (char **)&iso_date, 10);

    }

  else

    {

      /* hhmmss */

      tm.tm_sec = val % 100;

      tm.tm_min = (val % 10000) / 100;

      tm.tm_hour = val / 10000;

    }

  time_->tv_usec = 0;

  if (*iso_date == ',' || *iso_date == '.')

    {

      glong mul = 100000;

      while (g_ascii_isdigit (*++iso_date))

        {

          time_->tv_usec += (*iso_date - '0') * mul;

          mul /= 10;

        }

    }

  /* Now parse the offset and convert tm to a time_t */

  if (*iso_date == 'Z')

    {

      iso_date++;

      time_->tv_sec = mktime_utc (&tm;;

    }

  else if (*iso_date == '+' || *iso_date == '-')

    {

      gint sign = (*iso_date == '+') ? -1 : 1;

      val = strtoul (iso_date + 1, (char **)&iso_date, 10);

      if (*iso_date == ':')

        val = 60 * val + strtoul (iso_date + 1, (char **)&iso_date, 10);

      else

        val = 60 * (val / 100) + (val % 100);

      time_->tv_sec = mktime_utc (&tm) + (time_t) (60 * val * sign);

    }

  else

    {

      /* No "Z" or offset, so local time */

      tm.tm_isdst = -1; /* locale selects DST */

      time_->tv_sec = mktime (&tm;;

    }

  while (g_ascii_isspace (*iso_date))

    iso_date++;

  return *iso_date == '\0';

}

/**

 * g_time_val_to_iso8601:

 * @time_: a #GTimeVal

 * 

 * Converts @time_ into an RFC 3339 encoded string, relative to the

 * Coordinated Universal Time (UTC). This is one of the many formats

 * allowed by ISO 8601.

 *

 * ISO 8601 allows a large number of date/time formats, with or without

 * punctuation and optional elements. The format returned by this function

 * is a complete date and time, with optional punctuation included, the

 * UTC time zone represented as "Z", and the @tv_usec part included if

 * and only if it is nonzero, i.e. either

 * "YYYY-MM-DDTHH:MM:SSZ" or "YYYY-MM-DDTHH:MM:SS.fffffZ".

 *

 * This corresponds to the Internet date/time format defined by

 * [RFC 3339](https://www.ietf.org/rfc/rfc3339.txt),

 * and to either of the two most-precise formats defined by

 * the W3C Note

 * [Date and Time Formats](http://www.w3.org/TR/NOTE-datetime-19980827).

 * Both of these documents are profiles of ISO 8601.

 *

 * Use g_date_time_format() or g_strdup_printf() if a different

 * variation of ISO 8601 format is required.

 *

 * If @time_ represents a date which is too large to fit into a `struct tm`,

 * %NULL will be returned. This is platform dependent, but it is safe to assume

 * years up to 3000 are supported. The return value of g_time_val_to_iso8601()

 * has been nullable since GLib 2.54; before then, GLib would crash under the

 * same conditions.

 *

 * Returns: (nullable): a newly allocated string containing an ISO 8601 date,

 *    or %NULL if @time_ was too large

 *

 * Since: 2.12

 */

gchar *

g_time_val_to_iso8601 (GTimeVal *time_)

{

  gchar *retval;

  struct tm *tm;

#ifdef HAVE_GMTIME_R

  struct tm tm_;

#endif

  time_t secs;

  g_return_val_if_fail (time_->tv_usec >= 0 && time_->tv_usec < G_USEC_PER_SEC, NULL);

  secs = time_->tv_sec;

#ifdef _WIN32

  tm = gmtime (&secs;;

#else

#ifdef HAVE_GMTIME_R

  tm = gmtime_r (&secs, &tm_);

#else

  tm = gmtime (&secs;;

#endif

#endif

  /* If the gmtime() call has failed, time_->tv_sec is too big. */

  if (tm == NULL)

    return NULL;

  if (time_->tv_usec != 0)

    {

      /* ISO 8601 date and time format, with fractionary seconds:

       *   YYYY-MM-DDTHH:MM:SS.MMMMMMZ

       */

      retval = g_strdup_printf ("%4d-%02d-%02dT%02d:%02d:%02d.%06ldZ",

                                tm->tm_year + 1900,

                                tm->tm_mon + 1,

                                tm->tm_mday,

                                tm->tm_hour,

                                tm->tm_min,

                                tm->tm_sec,

                                time_->tv_usec);

    }

  else

    {

      /* ISO 8601 date and time format:

       *   YYYY-MM-DDTHH:MM:SSZ

       */

      retval = g_strdup_printf ("%4d-%02d-%02dT%02d:%02d:%02dZ",

                                tm->tm_year + 1900,

                                tm->tm_mon + 1,

                                tm->tm_mday,

                                tm->tm_hour,

                                tm->tm_min,

                                tm->tm_sec);

    }

  return retval;

}