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authorPaul Eggert <eggert@cs.ucla.edu>2018-11-15 22:59:33 +0100
committerAlbert ARIBAUD (3ADEV) <albert.aribaud@3adev.fr>2018-11-15 22:59:33 +0100
commit32c12f3f7ac9736d9ca2f0e074f1a3d02e973a35 (patch)
tree8d197061924beab582adcc663f1b6908eb3f1c0b /time
parentde20b81a038fe1c2060ce28125eec3838de5bdc5 (diff)
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mktime: new test for mktime failure
[BZ#23789] Based on a test suggested by Albert Aribaud in: https://www.sourceware.org/ml/libc-alpha/2018-10/msg00662.html * time/Makefile (tests): Add bug-mktime4. * time/bug-mktime4.c: New file.
Diffstat (limited to 'time')
-rw-r--r--time/Makefile2
-rw-r--r--time/bug-mktime4.c92
2 files changed, 93 insertions, 1 deletions
diff --git a/time/Makefile b/time/Makefile
index ec3e39dcea..743bd99f18 100644
--- a/time/Makefile
+++ b/time/Makefile
@@ -43,7 +43,7 @@ tests := test_time clocktest tst-posixtz tst-strptime tst_wcsftime \
tst-getdate tst-mktime tst-mktime2 tst-ftime_l tst-strftime \
tst-mktime3 tst-strptime2 bug-asctime bug-asctime_r bug-mktime1 \
tst-strptime3 bug-getdate1 tst-strptime-whitespace tst-ftime \
- tst-tzname tst-y2039
+ tst-tzname tst-y2039 bug-mktime4
include ../Rules
diff --git a/time/bug-mktime4.c b/time/bug-mktime4.c
new file mode 100644
index 0000000000..9c076eb623
--- /dev/null
+++ b/time/bug-mktime4.c
@@ -0,0 +1,92 @@
+#include <time.h>
+#include <errno.h>
+#include <limits.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <string.h>
+
+static bool
+equal_tm (struct tm const *t, struct tm const *u)
+{
+ return (t->tm_sec == u->tm_sec && t->tm_min == u->tm_min
+ && t->tm_hour == u->tm_hour && t->tm_mday == u->tm_mday
+ && t->tm_mon == u->tm_mon && t->tm_year == u->tm_year
+ && t->tm_wday == u->tm_wday && t->tm_yday == u->tm_yday
+ && t->tm_isdst == u->tm_isdst && t->tm_gmtoff == u->tm_gmtoff
+ && t->tm_zone == u->tm_zone);
+}
+
+static int
+do_test (void)
+{
+ /* Calculate minimum time_t value. This would be simpler with C11,
+ which has _Generic, but we cannot assume C11. It would also
+ be simpler with intprops.h, which has TYPE_MINIMUM, but it's
+ better not to use glibc internals. */
+ time_t time_t_min = -1;
+ time_t_min = (0 < time_t_min ? 0
+ : sizeof time_t_min == sizeof (long int) ? LONG_MIN
+ : sizeof time_t_min == sizeof (long long int) ? LLONG_MIN
+ : 1);
+ if (time_t_min == 1)
+ {
+ printf ("unknown time type\n");
+ return 1;
+ }
+ time_t ymin = time_t_min / 60 / 60 / 24 / 366;
+ bool mktime_should_fail = ymin == 0 || INT_MIN + 1900 < ymin + 1970;
+
+ struct tm tm0 = { .tm_year = INT_MIN, .tm_mday = 1, .tm_wday = -1 };
+ struct tm tm = tm0;
+ errno = 0;
+ time_t t = mktime (&tm);
+ long long int llt = t;
+ bool mktime_failed = tm.tm_wday == tm0.tm_wday;
+
+ if (mktime_failed)
+ {
+ if (! mktime_should_fail)
+ {
+ printf ("mktime failed but should have succeeded\n");
+ return 1;
+ }
+ if (errno == 0)
+ {
+ printf ("mktime failed without setting errno");
+ return 1;
+ }
+ if (t != (time_t) -1)
+ {
+ printf ("mktime returned %lld but did not set tm_wday\n", llt);
+ return 1;
+ }
+ if (! equal_tm (&tm, &tm0))
+ {
+ printf ("mktime (P) failed but modified *P\n");
+ return 1;
+ }
+ }
+ else
+ {
+ if (mktime_should_fail)
+ {
+ printf ("mktime succeeded but should have failed\n");
+ return 1;
+ }
+ struct tm *lt = localtime (&t);
+ if (lt == NULL)
+ {
+ printf ("mktime returned a value rejected by localtime\n");
+ return 1;
+ }
+ if (! equal_tm (lt, &tm))
+ {
+ printf ("mktime result does not match localtime result\n");
+ return 1;
+ }
+ }
+ return 0;
+}
+
+#define TIMEOUT 1000
+#include "support/test-driver.c"