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authorRoland McGrath <roland@gnu.org>2004-11-01 00:21:39 +0000
committerRoland McGrath <roland@gnu.org>2004-11-01 00:21:39 +0000
commite507cc567353fd77b00604fdfa405d4adc64ed18 (patch)
tree18dc8504781a232f37b213371dfb69cf5ccb4b80 /time/tst-mktime2.c
parent27b1a5c23501fac604335a8827690e12d4b8498e (diff)
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[BZ #473, BZ #487]
2004-10-27 Derek R. Price <derek@ximbiot.com> [BZ #487] This change is imported from gnulib. * time/mktime.c (not_equal_tm) [DEBUG]: Remove redundant check. 2004-10-24 Paul Eggert <eggert@cs.ucla.edu> [BZ #473] * time/tst-mktime.c (main): Don't assume that mktime fails when given time stamps before 1970. It returns negative time_t values instead, for compatibility with BSD. * time/tst-mktime2.c: New file. * time/Makefile (tests): Add it. [BZ #473] Import from gnulib. Revamp to avoid several problems near time_t extrema, and on hosts with 64-bit time_t and 32-bit int. This fixes Debian bug 177940. * time/mktime.c (TIME_T_MIDPOINT): New macro. (ydhms_diff): Renamed from ydhms_tm_diff, with a new signature, which avoids overflow problems on hosts with 64-bit time_t and 32-bit int. All callers changed. Now an inline function. Verify at compile-time that long int is wide enough to avoid these overflow problems. (guess_time_tm): New function. (__mktime_internal): Use it. Avoid overflow when computing yday on hosts with 64-bit long and 32-bit int. Remove tests for 69; no longer needed. Use if rather than #ifdef for LEAP_SECONDS_POSSIBLE so that the code is checked by more compilers. Do not rely on floating point to probe: stick to integer arithmetic, to avoid potential porting problems. Repair potential overflow correctly in the Southern Hemisphere. (localtime_offset): Add a FIXME for the case where time_t is unsigned.
Diffstat (limited to 'time/tst-mktime2.c')
-rw-r--r--time/tst-mktime2.c140
1 files changed, 140 insertions, 0 deletions
diff --git a/time/tst-mktime2.c b/time/tst-mktime2.c
new file mode 100644
index 0000000..fe7c370
--- /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"