From f0ba8702dcd5810a92c9b428032efb760bd4c100 Mon Sep 17 00:00:00 2001 From: Jim Meyering Date: Mon, 12 Oct 1998 02:51:10 +0000 Subject: [PATCH] . --- m4/mktime.m4 | 161 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 161 insertions(+) create mode 100644 m4/mktime.m4 diff --git a/m4/mktime.m4 b/m4/mktime.m4 new file mode 100644 index 000000000..5314c6350 --- /dev/null +++ b/m4/mktime.m4 @@ -0,0 +1,161 @@ +#serial 1000 + +dnl Just like mktime.m4 from automake-1.3b, but with an additional test. + +undefine([AM_FUNC_MKTIME]) +AC_DEFUN(AM_FUNC_MKTIME, +[AC_REQUIRE([AC_HEADER_TIME])dnl + AC_CHECK_HEADERS(sys/time.h unistd.h) + AC_CHECK_FUNCS(alarm) + AC_CACHE_CHECK([for working mktime], am_cv_func_working_mktime, + [AC_TRY_RUN( +changequote(<<, >>)dnl +< +# include +#else +# if HAVE_SYS_TIME_H +# include +# else +# include +# endif +#endif + +#if HAVE_UNISTD_H +# include +#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; + putenv ("TZ=America/Vancouver"); + 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 t, delta; + int i, j; + + 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 (); + spring_forward_gap (); + exit (0); +} + >>, +changequote([, ])dnl + am_cv_func_working_mktime=yes, am_cv_func_working_mktime=no, + dnl When crosscompiling, assume mktime is missing or broken. + am_cv_func_working_mktime=no) + ]) + if test $am_cv_func_working_mktime = no; then + LIBOBJS="$LIBOBJS mktime.o" + fi +]) -- 2.11.0