/* Test program from Paul Eggert and Tony Leneis. */ #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, 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; 0 < j; 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"