/* t-timestuff.c - Regression tests for time functions
 * Copyright (C) 2007 Free Software Foundation, Inc.
 *
 * This file is part of JNLIB.
 *
 * JNLIB 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 3 of
 * the License, or (at your option) any later version.
 *
 * JNLIB 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 program; if not, see <http://www.gnu.org/licenses/>.
 */

#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <time.h>

#include "mischelp.h"

#include "t-support.h"


static int
cmp_time_s (struct tm *a, struct tm *b)
{
  if (a->tm_year != b->tm_year
      || a->tm_mon  != b->tm_mon
      || a->tm_mday != b->tm_mday
      || a->tm_hour != b->tm_hour
      || a->tm_min  != b->tm_min
      || a->tm_sec  != b->tm_sec
      || a->tm_wday != b->tm_wday
      || a->tm_yday != b->tm_yday
      || !a->tm_isdst != !b->tm_isdst)
    return -1;
  return 0;
}



static void
test_timegm (void)
{
  static struct {
    int year, mon, mday, hour, min, sec;
  } tvalues[] = {
    { -1 },
    { -2,  1 },
    { -2,  2 },
    { -2,  86399 },
    { -2,  86400 },
    { -2,  0x7ffffffe },
    { -2,  0x7fffffff },
    /* Note: Because we use mktime below we can only start with the
       day after Epoch.  */
    { 1970, 1, 2, 0, 0 , 1},
    { 1970, 1, 2, 0, 0 , 2},
    { 1970, 1, 2, 12, 0 , 0},
    { 1970, 1, 2, 23, 59 , 59},
    { 1999, 12, 31, 23, 59 , 59},
    { 2000, 1, 1, 0, 0, 0},
    { 2000, 1, 1, 0, 0, 1},
    { 2010, 12, 31, 23, 59 , 59},
    { 2010, 1, 1, 0, 0, 0},
    { 2010, 1, 1, 0, 0, 1},
    /* The date below is about the last time mktime works in CET on
       Windows XP; this is a somewhat strange because 32 bit Unices
       will happily work along for another month until they reach the
       end of all ticks on 20380119T031408 (unless Uli takes
       compassion on us and changes time_t to a u64).  */
    { 2037, 12, 18, 23, 59, 59}

  };
  int tidx;
  time_t now, atime;
  struct tm tbuf, tbuf2, *tp;

  for (tidx=0; tidx < DIM (tvalues); tidx++)
    {
      if (tvalues[tidx].year == -1)
        {
          now = time (NULL);
        }
      else if (tvalues[tidx].year == -2)
        {
          now = tvalues[tidx].mon;
        }
      else
        {
          memset (&tbuf, 0, sizeof tbuf);
          tbuf.tm_year = tvalues[tidx].year - 1900;
          tbuf.tm_mon  = tvalues[tidx].mon;
          tbuf.tm_mday = tvalues[tidx].mday;
          tbuf.tm_hour = tvalues[tidx].hour;
          tbuf.tm_min  = tvalues[tidx].min;
          tbuf.tm_sec  = tvalues[tidx].sec;
          now = mktime (&tbuf);
        }
      if (now == (time_t)(-1))
        fail (tidx);

      tp = gmtime (&now);
      if (!tp)
        fail (tidx);
      tbuf = *tp;
      tbuf2 = tbuf;
      atime = timegm (&tbuf);
      if (atime == (time_t)(-1))
        fail (tidx);
      if (atime != now)
        fail (tidx);

      tp = gmtime (&atime);
      if (!tp)
        fail (tidx);
      if (cmp_time_s (tp, &tbuf))
        fail (tidx);
      if (cmp_time_s (tp, &tbuf2))
        fail (tidx);
    }
}



int
main (int argc, char **argv)
{
  (void)argc;
  (void)argv;

  test_timegm ();

  return 0;
}