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/* Implementation of the DATE_AND_TIME intrinsic.

   Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.

   Contributed by Steven Bosscher.

This file is part of the GNU Fortran 95 runtime library (libgfortran).

Libgfortran is free software; you can redistribute it and/or

modify it under the terms of the GNU General Public

License as published by the Free Software Foundation; either

version 2 of the License, or (at your option) any later version.

In addition to the permissions in the GNU General Public License, the

Free Software Foundation gives you unlimited permission to link the

compiled version of this file into combinations with other programs,

and to distribute those combinations without any restriction coming

from the use of this file.  (The General Public License restrictions

do apply in other respects; for example, they cover modification of

the file, and distribution when not linked into a combine

executable.)

Libgfortran 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 General Public License for more details.

You should have received a copy of the GNU General Public

License along with libgfortran; see the file COPYING.  If not,

write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,

Boston, MA 02110-1301, USA.  */

#include "config.h"

#include <sys/types.h>

#include <string.h>

#include <assert.h>

#include <stdio.h>

#include <stdlib.h>

#include "libgfortran.h"

#undef HAVE_NO_DATE_TIME

#if TIME_WITH_SYS_TIME

#  include <sys/time.h>

#  include <time.h>

#else

#  if HAVE_SYS_TIME_H

#    include <sys/time.h>

#  else

#    ifdef HAVE_TIME_H

#      include <time.h>

#    else

#      define HAVE_NO_DATE_TIME

#    endif  /* HAVE_TIME_H  */

#  endif  /* HAVE_SYS_TIME_H  */

#endif  /* TIME_WITH_SYS_TIME  */

#ifndef abs

#define abs(x) ((x)>=0 ? (x) : -(x))

#endif

/* DATE_AND_TIME ([DATE, TIME, ZONE, VALUES])

   Description: Returns data on the real-time clock and date in a form

   compatible with the representations defined in ISO 8601:1988.

   Class: Non-elemental subroutine.

   Arguments:

   DATE (optional) shall be scalar and of type default character, and

   shall be of length at least 8 in order to contain the complete

   value. It is an INTENT(OUT) argument. Its leftmost 8 characters

   are assigned a value of the form CCYYMMDD, where CC is the century,

   YY the year within the century, MM the month within the year, and

   DD the day within the month. If there is no date available, they

   are assigned blanks.

   TIME (optional) shall be scalar and of type default character, and

   shall be of length at least 10 in order to contain the complete

   value. It is an INTENT(OUT) argument. Its leftmost 10 characters

   are assigned a value of the form hhmmss.sss, where hh is the hour

   of the day, mm is the minutes of the hour, and ss.sss is the

   seconds and milliseconds of the minute. If there is no clock

   available, they are assigned blanks.

   ZONE (optional) shall be scalar and of type default character, and

   shall be of length at least 5 in order to contain the complete

   value. It is an INTENT(OUT) argument. Its leftmost 5 characters

   are assigned a value of the form ±hhmm, where hh and mm are the

   time difference with respect to Coordinated Universal Time (UTC) in

   hours and parts of an hour expressed in minutes, respectively. If

   there is no clock available, they are assigned blanks.

   VALUES (optional) shall be of type default integer and of rank

   one. It is an INTENT(OUT) argument. Its size shall be at least

   8. The values returned in VALUES are as follows:

      VALUES(1) the year (for example, 2003), or -HUGE(0) if there is

      no date available;

      VALUES(2) the month of the year, or -HUGE(0) if there

      is no date available;

      VALUES(3) the day of the month, or -HUGE(0) if there is no date

      available;

      VALUES(4) the time difference with respect to Coordinated

      Universal Time (UTC) in minutes, or -HUGE(0) if this information

      is not available;

      VALUES(5) the hour of the day, in the range of 0 to 23, or

      -HUGE(0) if there is no clock;

      VALUES(6) the minutes of the hour, in the range 0 to 59, or

      -HUGE(0) if there is no clock;

      VALUES(7) the seconds of the minute, in the range 0 to 60, or

      -HUGE(0) if there is no clock;

      VALUES(8) the milliseconds of the second, in the range 0 to

      999, or -HUGE(0) if there is no clock.

   NULL pointer represent missing OPTIONAL arguments.  All arguments

   have INTENT(OUT).  Because of the -i8 option, we must implement

   VALUES for INTEGER(kind=4) and INTEGER(kind=8).

   Based on libU77's date_time_.c.

   TODO :

   - Check year boundaries.

   - There is no STDC/POSIX way to get VALUES(8).  A GNUish way may

     be to use ftime.

*/

#define DATE_LEN 8

#define TIME_LEN 10   

#define ZONE_LEN 5

#define VALUES_SIZE 8

extern void date_and_time (char *, char *, char *, gfc_array_i4 *,

                           GFC_INTEGER_4, GFC_INTEGER_4, GFC_INTEGER_4);

export_proto(date_and_time);

void

date_and_time (char *__date, char *__time, char *__zone,

               gfc_array_i4 *__values, GFC_INTEGER_4 __date_len,

               GFC_INTEGER_4 __time_len, GFC_INTEGER_4 __zone_len)

{

  int i;

  char date[DATE_LEN + 1];

  char timec[TIME_LEN + 1];

  char zone[ZONE_LEN + 1];

  GFC_INTEGER_4 values[VALUES_SIZE];

#ifndef HAVE_NO_DATE_TIME

  time_t lt;

  struct tm local_time;

  struct tm UTC_time;

  lt = time (NULL);

  if (lt != (time_t) -1)

    {

      local_time = *localtime (&lt);

      UTC_time = *gmtime (&lt);

      /* All arguments can be derived from VALUES.  */

      values[0] = 1900 + local_time.tm_year;

      values[1] = 1 + local_time.tm_mon;

      values[2] = local_time.tm_mday;

      values[3] = (local_time.tm_min - UTC_time.tm_min +

                   60 * (local_time.tm_hour - UTC_time.tm_hour +

                     24 * (local_time.tm_yday - UTC_time.tm_yday)));

      values[4] = local_time.tm_hour;

      values[5] = local_time.tm_min;

      values[6] = local_time.tm_sec;

      values[7] = 0;

#if HAVE_GETTIMEOFDAY

      {

        struct timeval tp;

#  if GETTIMEOFDAY_ONE_ARGUMENT

        if (!gettimeofday (&tp))

#  else

#    if HAVE_STRUCT_TIMEZONE

        struct timezone tzp;

      /* Some systems such as HP-UX, do have struct timezone, but

         gettimeofday takes void* as the 2nd arg.  However, the

         effect of passing anything other than a null pointer is

         unspecified on HP-UX.  Configure checks if gettimeofday

         actually fails with a non-NULL arg and pretends that

         struct timezone is missing if it does fail.  */

        if (!gettimeofday (&tp, &tzp))

#    else

        if (!gettimeofday (&tp, (void *) 0))

#    endif /* HAVE_STRUCT_TIMEZONE  */

#  endif /* GETTIMEOFDAY_ONE_ARGUMENT  */

        values[7] = tp.tv_usec / 1000;

      }

#endif /* HAVE_GETTIMEOFDAY */

#if HAVE_SNPRINTF

      if (__date)

        snprintf (date, DATE_LEN + 1, "%04d%02d%02d",

                  values[0], values[1], values[2]);

      if (__time)

        snprintf (timec, TIME_LEN + 1, "%02d%02d%02d.%03d",

                  values[4], values[5], values[6], values[7]);

      if (__zone)

        snprintf (zone, ZONE_LEN + 1, "%+03d%02d",

                  values[3] / 60, abs (values[3] % 60));

#else

      if (__date)

        sprintf (date, "%04d%02d%02d", values[0], values[1], values[2]);

      if (__time)

        sprintf (timec, "%02d%02d%02d.%03d",

                 values[4], values[5], values[6], values[7]);

      if (__zone)

        sprintf (zone, "%+03d%02d",

                 values[3] / 60, abs (values[3] % 60));

#endif

    }

  else

    {

      memset (date, ' ', DATE_LEN);

      date[DATE_LEN] = '\0';

      memset (timec, ' ', TIME_LEN);

      timec[TIME_LEN] = '\0';

      memset (zone, ' ', ZONE_LEN);

      zone[ZONE_LEN] = '\0';

      for (i = 0; i < VALUES_SIZE; i++)

        values[i] = - GFC_INTEGER_4_HUGE;

    }

#else /* if defined HAVE_NO_DATE_TIME  */

  /* We really have *nothing* to return, so return blanks and HUGE(0).  */

  memset (date, ' ', DATE_LEN);

  date[DATE_LEN] = '\0';

  memset (timec, ' ', TIME_LEN);

  timec[TIME_LEN] = '\0';

  memset (zone, ' ', ZONE_LEN);

  zone[ZONE_LEN] = '\0';

  for (i = 0; i < VALUES_SIZE; i++)

    values[i] = - GFC_INTEGER_4_HUGE;

#endif  /* HAVE_NO_DATE_TIME  */

  /* Copy the values into the arguments.  */

  if (__values)

    {

      size_t len, delta, elt_size;

      elt_size = GFC_DESCRIPTOR_SIZE (__values);

      len = __values->dim[0].ubound + 1 - __values->dim[0].lbound;

      delta = __values->dim[0].stride;

      if (delta == 0)

        delta = 1;

      assert (len >= VALUES_SIZE);

      /* Cope with different type kinds.  */

      if (elt_size == 4)

        {

          GFC_INTEGER_4 *vptr4 = __values->data;

          for (i = 0; i < VALUES_SIZE; i++, vptr4 += delta)

            *vptr4 = values[i];

        }

      else if (elt_size == 8)

        {

          GFC_INTEGER_8 *vptr8 = (GFC_INTEGER_8 *)__values->data;

          for (i = 0; i < VALUES_SIZE; i++, vptr8 += delta)

            {

              if (values[i] == - GFC_INTEGER_4_HUGE)

                *vptr8 = - GFC_INTEGER_8_HUGE;

              else

                *vptr8 = values[i];

            }

        }

      else

        abort ();

    }

  if (__zone)

    {

      assert (__zone_len >= ZONE_LEN);

      fstrcpy (__zone, ZONE_LEN, zone, ZONE_LEN);

    }

  if (__time)

    {

      assert (__time_len >= TIME_LEN);

      fstrcpy (__time, TIME_LEN, timec, TIME_LEN);

    }

  if (__date)

    {

      assert (__date_len >= DATE_LEN);

      fstrcpy (__date, DATE_LEN, date, DATE_LEN);

    }

}

/* SECNDS (X) - Non-standard

   Description: Returns the system time of day, or elapsed time, as a GFC_REAL_4

   in seconds.

   Class: Non-elemental subroutine.

   Arguments:

   X must be REAL(4) and the result is of the same type.  The accuracy is system

   dependent.

   Usage:

        T = SECNDS (X)

   yields the time in elapsed seconds since X.  If X is 0.0, T is the time in

   seconds since midnight. Note that a time that spans midnight but is less than

   24hours will be calculated correctly.  */

extern GFC_REAL_4 secnds (GFC_REAL_4 *);

export_proto(secnds);

GFC_REAL_4

secnds (GFC_REAL_4 *x)

{

  GFC_INTEGER_4 values[VALUES_SIZE];

  GFC_REAL_4 temp1, temp2;

  /* Make the INTEGER*4 array for passing to date_and_time.  */

  gfc_array_i4 *avalues = internal_malloc_size (sizeof (gfc_array_i4));

  avalues->data = &values[0];

  GFC_DESCRIPTOR_DTYPE (avalues) = ((GFC_DTYPE_REAL << GFC_DTYPE_TYPE_SHIFT)

                                        & GFC_DTYPE_TYPE_MASK) +

                                    (4 << GFC_DTYPE_SIZE_SHIFT);

  avalues->dim[0].ubound = 7;

  avalues->dim[0].lbound = 0;

  avalues->dim[0].stride = 1;

  date_and_time (NULL, NULL, NULL, avalues, 0, 0, 0);

  free_mem (avalues);

  temp1 = 3600.0 * (GFC_REAL_4)values[4] +

            60.0 * (GFC_REAL_4)values[5] +

                   (GFC_REAL_4)values[6] +

           0.001 * (GFC_REAL_4)values[7];

  temp2 = fmod (*x, 86400.0);

  temp2 = (temp1 - temp2 > 0.0) ? temp2 : (temp2 - 86400.0);

  return temp1 - temp2;

}