# mktime.m4 serial 5 dnl Copyright (C) 2002, 2003 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, dnl with or without modifications, as long as this notice is preserved. dnl From Jim Meyering. # Redefine AC_FUNC_MKTIME, to fix a bug in Autoconf 2.57 and earlier. # This redefinition can be removed once a new version of Autoconf comes out. # The redefinition is taken from # . # AC_FUNC_MKTIME # -------------- AC_DEFUN([AC_FUNC_MKTIME], [AC_REQUIRE([AC_HEADER_TIME])dnl AC_CHECK_HEADERS(stdlib.h sys/time.h unistd.h) AC_CHECK_FUNCS(alarm) AC_CACHE_CHECK([for working mktime], ac_cv_func_working_mktime, [AC_RUN_IFELSE([AC_LANG_SOURCE( [[/* Test program from Paul Eggert and Tony Leneis. */ #if TIME_WITH_SYS_TIME # include # include #else # if HAVE_SYS_TIME_H # include # else # include # endif #endif #if HAVE_STDLIB_H # include #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; static time_t time_t_min; /* Values we'll use to set the TZ environment variable. */ static char *tz_strings[] = { (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_test1 (now) time_t now; { struct tm *lt; if ((lt = localtime (&now)) && mktime (lt) != now) exit (1); } static void mktime_test (now) 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 () { /* 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; 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 (1); } } int main () { time_t t, delta; int i, j; /* 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]) putenv (tz_strings[i]); 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; 0 < j; j *= 2) bigtime_test (j); bigtime_test (j - 1); } irix_6_4_bug (); spring_forward_gap (); exit (0); }]])], [ac_cv_func_working_mktime=yes], [ac_cv_func_working_mktime=no], [ac_cv_func_working_mktime=no])]) if test $ac_cv_func_working_mktime = no; then AC_LIBOBJ([mktime]) fi ])# AC_FUNC_MKTIME AC_DEFUN([gl_FUNC_MKTIME], [ AC_REQUIRE([AC_FUNC_MKTIME]) if test $ac_cv_func_working_mktime = no; then AC_DEFINE(mktime, rpl_mktime, [Define to rpl_mktime if the replacement function should be used.]) gl_PREREQ_MKTIME fi ]) # Prerequisites of lib/mktime.c. AC_DEFUN([gl_PREREQ_MKTIME], [:])