Y2038: make __tz_convert compatible with 64-bit-timeaaribaud/tmp

This implies that its callers be 64-bit-time compatible too.
It is done by creating 64-bit-time versions of these and
turning their original 32-bit-time versions into wrappers
(at a slight execution time cost).

The callers affected are:

  * localtime
  * localtime_r
  * ctime
  * ctime_r
  * gmtime
  * gmtime_r

Note that in time/tzfile.c we do not need to check for time_t
overflows anymore as introduced by commit fc79706a323 since we
now use internal_time_t.

1 files changed, 17 insertions, 3 deletions

diff --git a/time/ctime_r.c b/time/ctime_r.c
index c111146d76..e731b53a77 100644
--- a/time/ctime_r.c
+++ b/time/ctime_r.c
@@ -18,12 +18,26 @@
    <http://www.gnu.org/licenses/>.  */
 
 #include <time.h>
+#include <errno.h>
 
 /* Return a string as returned by asctime which is the representation
-   of *T in that form.  Reentrant version.  */
+   of *T in that form.  */
 char *
-ctime_r (const time_t *t, char *buf)
+__ctime64_r (const __time64_t *t, char *buf)
 {
   struct tm tm;
-  return __asctime_r (__localtime_r (t, &tm), buf);
+  return __asctime_r (__localtime64_r (t, &tm), buf);
 }
+
+/* Provide a 32-bit wrapper if needed */
+
+#if __TIMESIZE != 64
+
+char *
+ctime_r (const time_t *t, char *buf)
+{
+  __time64_t t64 = *t;
+  return __ctime64_r (&t64, buf);
+}
+
+#endif