-dnl From Jim Meyering.
-dnl FIXME: this should migrate into libit.
+#serial 1001
-AC_DEFUN(AM_FUNC_MKTIME,
+dnl Just like mktime.m4 from automake-1.3b, but with an additional test.
+dnl Renamed to have jm_ prefix and to use jm_ prefix on cache variable names.
+
+AC_DEFUN(jm_AM_FUNC_MKTIME,
[AC_REQUIRE([AC_HEADER_TIME])dnl
- AC_CHECK_HEADERS(sys/time.h)
- AC_CACHE_CHECK([for working mktime], am_cv_func_working_mktime,
- [AC_TRY_RUN([/* Test program from Tony Leneis (tony@plaza.ds.adp.com). */
+ AC_CHECK_HEADERS(sys/time.h unistd.h)
+ AC_CHECK_FUNCS(alarm)
+ AC_CACHE_CHECK([for working mktime], jm_am_cv_func_working_mktime,
+ [AC_TRY_RUN(
+changequote(<<, >>)dnl
+<</* Test program from Paul Eggert (eggert@twinsun.com)
+ and Tony Leneis (tony@plaza.ds.adp.com). */
#if TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
# include <time.h>
# endif
#endif
+
+#if HAVE_UNISTD_H
+# include <unistd.h>
+#endif
+
+#if !HAVE_ALARM
+# define alarm(X) /* empty */
+#endif
+
+/* Work around redefinition to rpl_putenv by other config tests. */
+#undef putenv
+
+static time_t time_t_max;
+
+/* Values we'll use to set the TZ environment variable. */
+static const char *const tz_strings[] = {
+ (const char *) 0, "TZ=GMT0", "TZ=JST-9",
+ "TZ=EST+3EDT+2,M10.1.0/00:00:00,M2.3.0/00:00:00"
+};
+#define N_STRINGS (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 ()
+{
+ /* 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. */
+ putenv ("TZ=PST8PDT,M4.1.0,M10.5.0");
+ 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_test (now)
+ time_t now;
+{
+ struct tm *lt;
+ if ((lt = localtime (&now)) && mktime (lt) != now)
+ exit (1);
+ now = time_t_max - now;
+ if ((lt = localtime (&now)) && mktime (lt) != now)
+ exit (1);
+}
+
+static void
+irix_6_4_bug ()
+{
+ /* 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 (1);
+}
+
+static void
+bigtime_test (j)
+ 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;
+ /* This test makes some buggy mktime implementations loop.
+ Give up after 10 seconds. */
+ alarm (10);
+ now = mktime (&tm);
+ alarm (0);
+ 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 (1);
+ }
+}
+
int
main ()
{
- time_t today = time (0);
- struct tm *local = localtime (&today);
- exit (mktime (local) != today);
+ time_t t, delta;
+ int i, j;
+
+ spring_forward_gap ();
+ for (time_t_max = 1; 0 < time_t_max; time_t_max *= 2)
+ continue;
+ time_t_max--;
+ delta = time_t_max / 997; /* a suitable prime number */
+ for (i = 0; i < N_STRINGS; i++)
+ {
+ if (tz_strings[i])
+ putenv (tz_strings[i]);
+
+ for (t = 0; t <= time_t_max - delta; t += delta)
+ mktime_test (t);
+ mktime_test ((time_t) 60 * 60);
+ mktime_test ((time_t) 60 * 60 * 24);
+
+ for (j = 1; 0 < j; j *= 2)
+ bigtime_test (j);
+ bigtime_test (j - 1);
+ }
+ irix_6_4_bug ();
+ exit (0);
}
- ],
- am_cv_func_working_mktime=yes, am_cv_func_working_mktime=no,
+ >>,
+changequote([, ])dnl
+ jm_am_cv_func_working_mktime=yes, jm_am_cv_func_working_mktime=no,
dnl When crosscompiling, assume mktime is missing or broken.
- am_cv_func_working_mktime=no)
+ jm_am_cv_func_working_mktime=no)
])
- if test $am_cv_func_working_mktime = no; then
+ if test $jm_am_cv_func_working_mktime = no; then
LIBOBJS="$LIBOBJS mktime.o"
fi
])
projects / gnulib.git / blobdiff