Update.

1998-11-03  Ulrich Drepper  <drepper@cygnus.com>

	* time/mktime.c (__mktime_internal): Handle broken down times
	around the time of the DST switches more correctly.

1998-11-02  Andreas Jaeger  <aj@arthur.rhein-neckar.de>

        * sysdeps/unix/sysv/linux/netatalk/at.h: Include <linux/atalk.h>
        before <sys/socket.h> to make sockaddr_at available to
        <sys/socket.h>.

1998-11-02  Andreas Jaeger  <aj@arthur.rhein-neckar.de>

	* time/tzset.c (tz_compute): Remove unused parameter timer.
	Change caller.

1998-11-02  Mark Kettenis  <kettenis@phys.uva.nl>

	* sysdeps/generic/bits/types.h (__ipc_pid_t): New typedef.

1 files changed, 27 insertions, 12 deletions

diff --git a/time/mktime.c b/time/mktime.c
index 0fa92e0e65..6135d70bd6 100644
--- a/time/mktime.c
+++ b/time/mktime.c
@@ -350,29 +350,44 @@ __mktime_internal (tp, convert, offset)
 
   /* If we have a match, check whether tm.tm_isdst has the requested
      value, if any.  */
-  if (dt == 0 && 0 <= isdst && 0 <= tm.tm_isdst)
+  if (dt == 0 && isdst >= 0 && isdst != tm.tm_isdst)
     {
       int dst_diff = (isdst != 0) - (tm.tm_isdst != 0);
       if (dst_diff)
 	{
-	  /* Move two hours in the direction indicated by the disagreement,
+	  /* Move three hours in the direction indicated by the disagreement,
 	     probe some more, and switch to a new time if found.
 	     The largest known fallback due to daylight savings is two hours:
-	     once, in Newfoundland, 1988-10-30 02:00 -> 00:00.  */
-	  time_t ot = t - 2 * 60 * 60 * dst_diff;
+	     once, in Newfoundland, 1988-10-30 02:00 -> 00:00.
+	     But some programs (e.g. testsuites) probe for larger differences
+	     between DST and normal time so switch by three hours.  No
+	     normal program does this so we do not account for more than
+	     three hours difference.  */
+	  time_t ot = t - 3 * 60 * 60 * dst_diff;
+	  struct tm otm;
+	  struct tm tmptm;
+
+	  otm.tm_isdst = -1;
+
 	  while (--remaining_probes != 0)
 	    {
-	      struct tm otm;
 	      if (! (dt = ydhms_tm_diff (year, yday, hour, min, sec,
-					 ranged_convert (convert, &ot, &otm))))
-		{
-		  t = ot;
-		  tm = otm;
-		  break;
-		}
-	      if ((ot += dt) == t)
+					 ranged_convert (convert, &ot,
+							 &tmptm)))
+		  || tmptm.tm_isdst != isdst)
+		break;
+
+	      otm = tmptm;
+	      ot += dt;
+	      if (ot == t)
 		break;  /* Avoid a redundant probe.  */
 	    }
+
+	  if (otm.tm_isdst != -1)
+	    {
+	      t = ot;
+	      tm = otm;
+	    }
 	}
     }