Use 64-bit time_t interfaces in strftime and strptime (bug 30053)

Both functions use time_t only internally, so the ABI is not affected.

1 files changed, 52 insertions, 0 deletions

diff --git a/time/tst-strftime4.c b/time/tst-strftime4.c
new file mode 100644
index 0000000000..659716d0fa
--- /dev/null
+++ b/time/tst-strftime4.c
@@ -0,0 +1,52 @@
+/* Test strftime and strptime after 2038-01-19 03:14:07 UTC (bug 30053).
+   Copyright (C) 2023 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <time.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <support/check.h>
+
+static int
+do_test (void)
+{
+  TEST_VERIFY_EXIT (setenv ("TZ", "UTC0", 1) == 0);
+  tzset ();
+  if (sizeof (time_t) > 4)
+    {
+      time_t wrap = (time_t) 2147483648LL;
+      char buf[80];
+      struct tm *tm = gmtime (&wrap);
+      TEST_VERIFY_EXIT (tm != NULL);
+      TEST_VERIFY_EXIT (strftime (buf, sizeof buf, "%s", tm) > 0);
+      puts (buf);
+      TEST_VERIFY (strcmp (buf, "2147483648") == 0);
+
+      struct tm tm2;
+      char *p = strptime (buf, "%s", &tm2);
+      TEST_VERIFY_EXIT (p != NULL && *p == '\0');
+      time_t t = mktime (&tm2);
+      printf ("%lld\n", (long long) t);
+      TEST_VERIFY (t == wrap);
+    }
+  else
+    FAIL_UNSUPPORTED ("32-bit time_t");
+  return 0;
+}
+
+#include <support/test-driver.c>