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gcc/libgfortran/intrinsics/date_and_time.c

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/* Implementation of the DATE_AND_TIME intrinsic.
Copyright (C) 2003, 2004 Free Software Foundation, Inc.
Contributed by Steven Bosscher.
This file is part of the GNU Fortran 95 runtime library (libgfor).
Libgfor 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.
Libgfor 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 libgfor; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, 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.
*/
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)
{
#define DATE_LEN 8
#define TIME_LEN 10
#define ZONE_LEN 5
#define VALUES_SIZE 8
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 = time (NULL);
struct tm local_time = *localtime (&lt);
struct tm 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;
#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 HPUX. 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;
}
#else
values[7] = GFC_INTEGER_4_HUGE;
#endif /* HAVE_GETTIMEOFDAY */
if (__date)
{
#if HAVE_SNPRINTF
snprintf (date, DATE_LEN + 1, "%04d%02d%02d",
values[0], values[1], values[2]);
#else
sprintf (date, "%04d%02d%02d",
values[0], values[1], values[2]);
#endif
}
if (__time)
{
#if HAVE_SNPRINTF
snprintf (timec, TIME_LEN + 1, "%02d%02d%02d.%03d",
values[4], values[5], values[6], values[7]);
#else
sprintf (timec, "%02d%02d%02d.%03d",
values[4], values[5], values[6], values[7]);
#endif
}
if (__zone)
{
#if HAVE_SNPRINTF
snprintf (zone, ZONE_LEN + 1, "%+03d%02d",
values[3] / 60, abs (values[3] % 60));
#else
sprintf (zone, "%+03d%02d",
values[3] / 60, abs (values[3] % 60));
#endif
}
#else /* if defined HAVE_NO_DATE_TIME */
/* We really have *nothing* to return, so return blanks and HUGE(0). */
{
int i;
memset (date, ' ', DATE_LEN);
date[DATE_LEN] = '\0';
memset (timec, ' ', TIME_LEN);
time[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)
{
int i;
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);
}
#undef DATE_LEN
#undef TIME_LEN
#undef ZONE_LEN
#undef VALUES_SIZE
}
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