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authorUlrich Drepper <drepper@redhat.com>1998-11-03 15:49:43 +0000
committerUlrich Drepper <drepper@redhat.com>1998-11-03 15:49:43 +0000
commit5fea58fbe857e89ceb4f0c0afb48278806f2e32f (patch)
treecde963b0f39470fba9c8790c9e54947ef09eed73 /time/mktime.c
parente254df14d58746e1e09dca15f43e8a88c5c5218b (diff)
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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.
Diffstat (limited to 'time/mktime.c')
-rw-r--r--time/mktime.c39
1 files changed, 27 insertions, 12 deletions
diff --git a/time/mktime.c b/time/mktime.c
index 0fa92e0..6135d70 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;
+ }
}
}