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/* Test program from Paul Eggert and Tony Leneis. */
#include <limits.h>
#include <time.h>
#include <stdlib.h>
#include <unistd.h>
static time_t time_t_max;
static time_t time_t_min;
/* 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);
for (time_t_max = 1; 0 < time_t_max; time_t_max *= 2)
continue;
time_t_max--;
if ((time_t) -1 < 0)
for (time_t_min = -1; (time_t) (time_t_min * 2) < 0; time_t_min *= 2)
continue;
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"
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