diff options
Diffstat (limited to 'time/tst-mktime2.c')
| -rw-r--r-- | time/tst-mktime2.c | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/time/tst-mktime2.c b/time/tst-mktime2.c new file mode 100644 index 0000000000..fe7c370928 --- /dev/null +++ b/time/tst-mktime2.c @@ -0,0 +1,140 @@ +/* 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; + 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" |