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New file, which is a preview of what should appear
in the next public autoconf release.
This commit is contained in:
Jim Meyering
parent
8dc0dbec88
commit
07432a0f9d
167
m4/mktime.m4
Normal file
167
m4/mktime.m4
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@ -0,0 +1,167 @@
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#serial 1000
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dnl From Paul Eggert
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dnl Check for a working mktime.
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dnl This is a preview of what should appear in the next public autoconf release.
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AC_DEFUN(AC_FUNC_MKTIME,
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[AC_REQUIRE([AC_HEADER_TIME])dnl
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AC_CHECK_HEADERS(sys/time.h unistd.h)
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AC_CHECK_FUNCS(alarm)
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AC_CACHE_CHECK([for working mktime], ac_cv_func_working_mktime,
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[AC_TRY_RUN(
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changequote(<<, >>)dnl
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<</* Test program from Paul Eggert (eggert@twinsun.com)
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and Tony Leneis (tony@plaza.ds.adp.com). */
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#if TIME_WITH_SYS_TIME
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# include <sys/time.h>
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# include <time.h>
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#else
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# if HAVE_SYS_TIME_H
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# include <sys/time.h>
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# else
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# include <time.h>
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# endif
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#endif
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#if HAVE_UNISTD_H
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# include <unistd.h>
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#endif
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#if !HAVE_ALARM
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# define alarm(X) /* empty */
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#endif
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/* Work around redefinition to rpl_putenv by other config tests. */
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#undef putenv
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static time_t time_t_max;
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/* Values we'll use to set the TZ environment variable. */
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static const char *const tz_strings[] = {
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(const char *) 0, "TZ=GMT0", "TZ=JST-9",
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"TZ=EST+3EDT+2,M10.1.0/00:00:00,M2.3.0/00:00:00"
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};
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#define N_STRINGS (sizeof (tz_strings) / sizeof (tz_strings[0]))
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/* Fail if mktime fails to convert a date in the spring-forward gap.
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Based on a problem report from Andreas Jaeger. */
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static void
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spring_forward_gap ()
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{
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/* glibc (up to about 1998-10-07) failed this test) */
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struct tm tm;
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/* Use the portable POSIX.1 specification "TZ=PST8PDT,M4.1.0,M10.5.0"
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instead of "TZ=America/Vancouver" in order to detect the bug even
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on systems that don't support the Olson extension, or don't have the
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full zoneinfo tables installed. */
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putenv ("TZ=PST8PDT,M4.1.0,M10.5.0");
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tm.tm_year = 98;
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tm.tm_mon = 3;
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tm.tm_mday = 5;
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tm.tm_hour = 2;
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tm.tm_min = 0;
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tm.tm_sec = 0;
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tm.tm_isdst = -1;
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if (mktime (&tm) == (time_t)-1)
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exit (1);
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}
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static void
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mktime_test (now)
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time_t now;
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{
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struct tm *lt;
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if ((lt = localtime (&now)) && mktime (lt) != now)
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exit (1);
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now = time_t_max - now;
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if ((lt = localtime (&now)) && mktime (lt) != now)
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exit (1);
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}
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static void
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irix_6_4_bug ()
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{
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/* Based on code from Ariel Faigon. */
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struct tm tm;
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tm.tm_year = 96;
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tm.tm_mon = 3;
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tm.tm_mday = 0;
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tm.tm_hour = 0;
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tm.tm_min = 0;
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tm.tm_sec = 0;
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tm.tm_isdst = -1;
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mktime (&tm);
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if (tm.tm_mon != 2 || tm.tm_mday != 31)
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exit (1);
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}
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static void
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bigtime_test (j)
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int j;
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{
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struct tm tm;
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time_t now;
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tm.tm_year = tm.tm_mon = tm.tm_mday = tm.tm_hour = tm.tm_min = tm.tm_sec = j;
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now = mktime (&tm);
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if (now != (time_t) -1)
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{
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struct tm *lt = localtime (&now);
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if (! (lt
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&& lt->tm_year == tm.tm_year
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&& lt->tm_mon == tm.tm_mon
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&& lt->tm_mday == tm.tm_mday
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&& lt->tm_hour == tm.tm_hour
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&& lt->tm_min == tm.tm_min
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&& lt->tm_sec == tm.tm_sec
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&& lt->tm_yday == tm.tm_yday
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&& lt->tm_wday == tm.tm_wday
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&& ((lt->tm_isdst < 0 ? -1 : 0 < lt->tm_isdst)
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== (tm.tm_isdst < 0 ? -1 : 0 < tm.tm_isdst))))
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exit (1);
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}
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}
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int
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main ()
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{
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time_t t, delta;
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int i, j;
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/* This test makes some buggy mktime implementations loop.
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Give up after 60 seconds; a mktime slower than that
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isn't worth using anyway. */
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alarm (60);
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for (time_t_max = 1; 0 < time_t_max; time_t_max *= 2)
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continue;
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time_t_max--;
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delta = time_t_max / 997; /* a suitable prime number */
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for (i = 0; i < N_STRINGS; i++)
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{
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if (tz_strings[i])
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putenv (tz_strings[i]);
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for (t = 0; t <= time_t_max - delta; t += delta)
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mktime_test (t);
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mktime_test ((time_t) 60 * 60);
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mktime_test ((time_t) 60 * 60 * 24);
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for (j = 1; 0 < j; j *= 2)
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bigtime_test (j);
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bigtime_test (j - 1);
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}
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irix_6_4_bug ();
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spring_forward_gap ();
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exit (0);
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}
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>>,
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changequote([, ])dnl
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ac_cv_func_working_mktime=yes, ac_cv_func_working_mktime=no,
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ac_cv_func_working_mktime=no)])
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if test $ac_cv_func_working_mktime = no; then
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LIBOBJS="$LIBOBJS mktime.${ac_objext}"
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fi
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])
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