From 5fea58fbe857e89ceb4f0c0afb48278806f2e32f Mon Sep 17 00:00:00 2001 From: Ulrich Drepper Date: Tue, 3 Nov 1998 15:49:43 +0000 Subject: Update. 1998-11-03 Ulrich Drepper * time/mktime.c (__mktime_internal): Handle broken down times around the time of the DST switches more correctly. 1998-11-02 Andreas Jaeger * sysdeps/unix/sysv/linux/netatalk/at.h: Include before to make sockaddr_at available to . 1998-11-02 Andreas Jaeger * time/tzset.c (tz_compute): Remove unused parameter timer. Change caller. 1998-11-02 Mark Kettenis * sysdeps/generic/bits/types.h (__ipc_pid_t): New typedef. --- time/mktime.c | 39 +++++++++++++++++++++++++++------------ 1 file changed, 27 insertions(+), 12 deletions(-) (limited to 'time') 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; + } } } -- cgit v1.1