libgfortran/intrinsics/date_and_time.c

   1 /* Implementation of the DATE_AND_TIME intrinsic.
   2    Copyright (C) 2003, 2004 Free Software Foundation, Inc.
   3    Contributed by Steven Bosscher.
   4
   5 This file is part of the GNU Fortran 95 runtime library (libgfor).
   6
   7 Libgfor is free software; you can redistribute it and/or
   8 modify it under the terms of the GNU Lesser General Public
   9 License as published by the Free Software Foundation; either
  10 version 2.1 of the License, or (at your option) any later version.
  11
  12 Libgfor is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU Lesser General Public License for more details.
  16
  17 You should have received a copy of the GNU Lesser General Public
  18 License along with libgfor; see the file COPYING.LIB.  If not,
  19 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.  */
  21
  22 #include "config.h"
  23 #include <sys/types.h>
  24 #include <string.h>
  25 #include <assert.h>
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include "libgfortran.h"
  29
  30 #undef HAVE_NO_DATE_TIME
  31 #if TIME_WITH_SYS_TIME
  32 #  include <sys/time.h>
  33 #  include <time.h>
  34 #else
  35 #  if HAVE_SYS_TIME_H
  36 #    include <sys/time.h>
  37 #  else
  38 #    ifdef HAVE_TIME_H
  39 #      include <time.h>
  40 #    else
  41 #      define HAVE_NO_DATE_TIME
  42 #    endif  /* HAVE_TIME_H  */
  43 #  endif  /* HAVE_SYS_TIME_H  */
  44 #endif  /* TIME_WITH_SYS_TIME  */
  45
  46 #ifndef abs
  47 #define abs(x) ((x)>=0 ? (x) : -(x))
  48 #endif
  49
  50 /* DATE_AND_TIME ([DATE, TIME, ZONE, VALUES])
  51
  52    Description: Returns data on the real-time clock and date in a form
  53    compatible with the representations defined in ISO 8601:1988.
  54
  55    Class: Non-elemental subroutine.
  56
  57    Arguments:
  58
  59    DATE (optional) shall be scalar and of type default character, and
  60    shall be of length at least 8 in order to contain the complete
  61    value. It is an INTENT (OUT) argument. Its leftmost 8 characters
  62    are assigned a value of the form CCYYMMDD, where CC is the century,
  63    YY the year within the century, MM the month within the year, and
  64    DD the day within the month. If there is no date available, they
  65    are assigned blanks.
  66
  67    TIME (optional) shall be scalar and of type default character, and
  68    shall be of length at least 10 in order to contain the complete
  69    value. It is an INTENT (OUT) argument. Its leftmost 10 characters
  70    are assigned a value of the form hhmmss.sss, where hh is the hour
  71    of the day, mm is the minutes of the hour, and ss.sss is the
  72    seconds and milliseconds of the minute. If there is no clock
  73    available, they are assigned blanks.
  74
  75    ZONE (optional) shall be scalar and of type default character, and
  76    shall be of length at least 5 in order to contain the complete
  77    value. It is an INTENT (OUT) argument. Its leftmost 5 characters
  78    are assigned a value of the form ±hhmm, where hh and mm are the
  79    time difference with respect to Coordinated Universal Time (UTC) in
  80    hours and parts of an hour expressed in minutes, respectively. If
  81    there is no clock available, they are assigned blanks.
  82
  83    VALUES (optional) shall be of type default integer and of rank
  84    one. It is an INTENT (OUT) argument. Its size shall be at least
  85    8. The values returned in VALUES are as follows:
  86
  87       VALUES (1) the year (for example, 2003), or HUGE (0) if there is
  88       no date available;
  89
  90       VALUES (2) the month of the year, or HUGE (0) if there
  91       is no date available;
  92
  93       VALUES (3) the day of the month, or HUGE (0) if there is no date
  94       available;
  95
  96       VALUES (4) the time difference with respect to Coordinated
  97       Universal Time (UTC) in minutes, or HUGE (0) if this information
  98       is not available;
  99
 100       VALUES (5) the hour of the day, in the range of 0 to 23, or HUGE
 101       (0) if there is no clock;
 102
 103       VALUES (6) the minutes of the hour, in the range 0 to 59, or
 104       HUGE (0) if there is no clock;
 105
 106       VALUES (7) the seconds of the minute, in the range 0 to 60, or
 107       HUGE (0) if there is no clock;
 108
 109       VALUES (8) the milliseconds of the second, in the range 0 to
 110       999, or HUGE (0) if there is no clock.
 111
 112    NULL pointer represent missing OPTIONAL arguments.  All arguments
 113    have INTENT(OUT).  Because of the -i8 option, we must implement
 114    VALUES for INTEGER(kind=4) and INTEGER(kind=8).
 115
 116    Based on libU77's date_time_.c.
 117
 118    TODO :
 119    - Check year boundaries.
 120    - There is no STDC/POSIX way to get VALUES(8).  A GNUish way may
 121      be to use ftime.
 122 */
 123
 124 extern void date_and_time (char *, char *, char *, gfc_array_i4 *,
 125                            GFC_INTEGER_4, GFC_INTEGER_4, GFC_INTEGER_4);
 126 export_proto(date_and_time);
 127
 128 void
 129 date_and_time (char *__date,
 130                char *__time,
 131                char *__zone,
 132                gfc_array_i4 *__values,
 133                GFC_INTEGER_4 __date_len,
 134                GFC_INTEGER_4 __time_len,
 135                GFC_INTEGER_4 __zone_len)
 136 {
 137 #define DATE_LEN 8
 138 #define TIME_LEN 10
 139 #define ZONE_LEN 5
 140 #define VALUES_SIZE 8
 141   char date[DATE_LEN + 1];
 142   char timec[TIME_LEN + 1];
 143   char zone[ZONE_LEN + 1];
 144   GFC_INTEGER_4 values[VALUES_SIZE];
 145
 146 #ifndef HAVE_NO_DATE_TIME
 147   time_t lt = time (NULL);
 148   struct tm local_time = *localtime (&lt);
 149   struct tm UTC_time = *gmtime (&lt);
 150
 151   /* All arguments can be derived from VALUES.  */
 152   values[0] = 1900 + local_time.tm_year;
 153   values[1] = 1 + local_time.tm_mon;
 154   values[2] = local_time.tm_mday;
 155   values[3] = (local_time.tm_min - UTC_time.tm_min +
 156                60 * (local_time.tm_hour - UTC_time.tm_hour +
 157                      24 * (local_time.tm_yday - UTC_time.tm_yday)));
 158   values[4] = local_time.tm_hour;
 159   values[5] = local_time.tm_min;
 160   values[6] = local_time.tm_sec;
 161 #if HAVE_GETTIMEOFDAY
 162     {
 163       struct timeval tp;
 164 #  if GETTIMEOFDAY_ONE_ARGUMENT
 165       if (!gettimeofday (&tp))
 166 #  else
 167 #    if HAVE_STRUCT_TIMEZONE
 168       struct timezone tzp;
 169
 170       /* Some systems such as HP-UX, do have struct timezone, but
 171          gettimeofday takes void* as the 2nd arg.  However, the
 172          effect of passing anything other than a null pointer is
 173          unspecified on HPUX.  Configure checks if gettimeofday
 174          actually fails with a non-NULL arg and pretends that
 175          struct timezone is missing if it does fail.  */
 176       if (!gettimeofday (&tp, &tzp))
 177 #    else
 178       if (!gettimeofday (&tp, (void *) 0))
 179 #    endif /* HAVE_STRUCT_TIMEZONE  */
 180 #  endif /* GETTIMEOFDAY_ONE_ARGUMENT  */
 181         values[7] = tp.tv_usec / 1000;
 182     }
 183 #else
 184    values[7] = GFC_INTEGER_4_HUGE;
 185 #endif /* HAVE_GETTIMEOFDAY */
 186
 187   if (__date)
 188     {
 189 #if HAVE_SNPRINTF
 190       snprintf (date, DATE_LEN + 1, "%04d%02d%02d",
 191                 values[0], values[1], values[2]);
 192 #else
 193       sprintf (date, "%04d%02d%02d",
 194                values[0], values[1], values[2]);
 195 #endif
 196     }
 197
 198   if (__time)
 199     {
 200 #if HAVE_SNPRINTF
 201       snprintf (timec, TIME_LEN + 1, "%02d%02d%02d.%03d",
 202                 values[4], values[5], values[6], values[7]);
 203 #else
 204       sprintf (timec, "%02d%02d%02d.%03d",
 205                values[4], values[5], values[6], values[7]);
 206 #endif
 207     }
 208
 209   if (__zone)
 210     {
 211 #if HAVE_SNPRINTF
 212       snprintf (zone, ZONE_LEN + 1, "%+03d%02d",
 213                 values[3] / 60, abs (values[3] % 60));
 214 #else
 215       sprintf (zone, "%+03d%02d",
 216                values[3] / 60, abs (values[3] % 60));
 217 #endif
 218     }
 219 #else /* if defined HAVE_NO_DATE_TIME  */
 220   /* We really have *nothing* to return, so return blanks and HUGE(0).  */
 221     {
 222       int i;
 223
 224       memset (date, ' ', DATE_LEN);
 225       date[DATE_LEN] = '\0';
 226
 227       memset (timec, ' ', TIME_LEN);
 228       time[TIME_LEN] = '\0';
 229
 230       memset (zone, ' ', ZONE_LEN);
 231       zone[ZONE_LEN] = '\0';
 232
 233       for (i = 0; i < VALUES_SIZE; i++)
 234         values[i] = GFC_INTEGER_4_HUGE;
 235     }
 236 #endif  /* HAVE_NO_DATE_TIME  */
 237
 238   /* Copy the values into the arguments.  */
 239   if (__values)
 240     {
 241       int i;
 242       size_t len, delta, elt_size;
 243
 244       elt_size = GFC_DESCRIPTOR_SIZE (__values);
 245       len = __values->dim[0].ubound + 1 - __values->dim[0].lbound;
 246       delta = __values->dim[0].stride;
 247       if (delta == 0)
 248         delta = 1;
 249
 250       assert (len >= VALUES_SIZE);
 251       /* Cope with different type kinds.  */
 252       if (elt_size == 4)
 253         {
 254           GFC_INTEGER_4 *vptr4 = __values->data;
 255
 256           for (i = 0; i < VALUES_SIZE; i++, vptr4 += delta)
 257             {
 258               *vptr4 = values[i];
 259             }
 260         }
 261       else if (elt_size == 8)
 262         {
 263           GFC_INTEGER_8 *vptr8 = (GFC_INTEGER_8 *)__values->data;
 264
 265           for (i = 0; i < VALUES_SIZE; i++, vptr8 += delta)
 266             {
 267               if (values[i] == GFC_INTEGER_4_HUGE)
 268                 *vptr8 = GFC_INTEGER_8_HUGE;
 269               else
 270                 *vptr8 = values[i];
 271             }
 272         }
 273       else
 274         abort ();
 275     }
 276
 277   if (__zone)
 278     {
 279       assert (__zone_len >= ZONE_LEN);
 280       fstrcpy (__zone, ZONE_LEN, zone, ZONE_LEN);
 281     }
 282
 283   if (__time)
 284     {
 285       assert (__time_len >= TIME_LEN);
 286       fstrcpy (__time, TIME_LEN, timec, TIME_LEN);
 287     }
 288
 289   if (__date)
 290     {
 291       assert (__date_len >= DATE_LEN);
 292       fstrcpy (__date, DATE_LEN, date, DATE_LEN);
 293     }
 294 #undef DATE_LEN
 295 #undef TIME_LEN
 296 #undef ZONE_LEN
 297 #undef VALUES_SIZE
 298 }