/* Test program from Paul Eggert and Tony Leneis.  */

#include <limits.h>

#include <time.h>

#include <stdlib.h>

#include <unistd.h>

/* True if the arithmetic type T is signed.  */

#define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))

/* The maximum and minimum values for the integer type T.  These

   macros have undefined behavior if T is signed and has padding bits.

   If this is a problem for you, please let us know how to fix it for

   your host.  */

#define TYPE_MINIMUM(t) \

  ((t) (! TYPE_SIGNED (t) \

	? (t) 0 \

	: ~ TYPE_MAXIMUM (t)))

#define TYPE_MAXIMUM(t) \

  ((t) (! TYPE_SIGNED (t) \

	? (t) -1 \

	: ((((t) 1 << (sizeof (t) * CHAR_BIT - 2)) - 1) * 2 + 1)))

#ifndef TIME_T_MIN

# define TIME_T_MIN TYPE_MINIMUM (time_t)

#endif

#ifndef TIME_T_MAX

# define TIME_T_MAX TYPE_MAXIMUM (time_t)

#endif

/* Values we'll use to set the TZ environment variable.  */

static const char *tz_strings[] =

  {

    (const char *) 0, "GMT0", "JST-9",

    "EST+3EDT+2,M10.1.0/00:00:00,M2.3.0/00:00:00"

  };

#define N_STRINGS ((int) (sizeof (tz_strings) / sizeof (tz_strings[0])))

/* Fail if mktime fails to convert a date in the spring-forward gap.

   Based on a problem report from Andreas Jaeger.  */

static void

spring_forward_gap (void)

{

  /* glibc (up to about 1998-10-07) failed this test. */

  struct tm tm;

  /* Use the portable POSIX.1 specification "TZ=PST8PDT,M4.1.0,M10.5.0"

     instead of "TZ=America/Vancouver" in order to detect the bug even

     on systems that don't support the Olson extension, or don't have the

     full zoneinfo tables installed.  */

  setenv ("TZ", "PST8PDT,M4.1.0,M10.5.0", 1);

  tm.tm_year = 98;

  tm.tm_mon = 3;

  tm.tm_mday = 5;

  tm.tm_hour = 2;

  tm.tm_min = 0;

  tm.tm_sec = 0;

  tm.tm_isdst = -1;

  if (mktime (&tm) == (time_t)-1)

    exit (1);

}

static void

mktime_test1 (time_t now)

{

  struct tm *lt = localtime (&now;;

  if (lt && mktime (lt) != now)

    exit (2);

}

static void

mktime_test (time_t now)

{

  mktime_test1 (now);

  mktime_test1 ((time_t) (TIME_T_MAX - now));

  mktime_test1 ((time_t) (TIME_T_MIN + now));

}

static void

irix_6_4_bug (void)

{

  /* Based on code from Ariel Faigon.  */

  struct tm tm;

  tm.tm_year = 96;

  tm.tm_mon = 3;

  tm.tm_mday = 0;

  tm.tm_hour = 0;

  tm.tm_min = 0;

  tm.tm_sec = 0;

  tm.tm_isdst = -1;

  mktime (&tm;;

  if (tm.tm_mon != 2 || tm.tm_mday != 31)

    exit (3);

}

static void

bigtime_test (int j)

{

  struct tm tm;

  time_t now;

  tm.tm_year = tm.tm_mon = tm.tm_mday = tm.tm_hour = tm.tm_min = tm.tm_sec = j;

  tm.tm_isdst = -1;

  now = mktime (&tm;;

  if (now != (time_t) -1)

    {

      struct tm *lt = localtime (&now;;

      if (! (lt

	     && lt->tm_year == tm.tm_year

	     && lt->tm_mon == tm.tm_mon

	     && lt->tm_mday == tm.tm_mday

	     && lt->tm_hour == tm.tm_hour

	     && lt->tm_min == tm.tm_min

	     && lt->tm_sec == tm.tm_sec

	     && lt->tm_yday == tm.tm_yday

	     && lt->tm_wday == tm.tm_wday

	     && ((lt->tm_isdst < 0 ? -1 : 0 < lt->tm_isdst)

		  == (tm.tm_isdst < 0 ? -1 : 0 < tm.tm_isdst))))

	exit (4);

    }

}

static int

do_test (void)

{

  time_t t, delta;

  int i;

  unsigned int j;

  setenv ("TZ", "America/Sao_Paulo", 1);

  /* This test makes some buggy mktime implementations loop.

     Give up after 60 seconds; a mktime slower than that

     isn't worth using anyway.  */

  alarm (60);

  delta = TIME_T_MAX / 997; /* a suitable prime number */

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

    {

      if (tz_strings[i])

	setenv ("TZ", tz_strings[i], 1);

      for (t = 0; t <= TIME_T_MAX - delta; t += delta)

	mktime_test (t);

      mktime_test ((time_t) 1);

      mktime_test ((time_t) (60 * 60));

      mktime_test ((time_t) (60 * 60 * 24));

      for (j = 1; j <= INT_MAX; j *= 2)

	bigtime_test (j);

      bigtime_test (j - 1);

    }

  irix_6_4_bug ();

  spring_forward_gap ();

  return 0;

}

#define TEST_FUNCTION do_test ()

#include "../test-skeleton.c"