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* time/mktime.c (__mktime_internal): Correct last change.  We must
	stop searching for the right isdst value before stepping to the
	initial value.
This commit is contained in:
Ulrich Drepper 1998-11-04 21:20:17 +00:00
parent 3ddfec55c4
commit 98b567ffae
2 changed files with 20 additions and 28 deletions
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4
ChangeLog
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@ -1,5 +1,9 @@
1998-11-04 Ulrich Drepper <drepper@cygnus.com>
* time/mktime.c (__mktime_internal): Correct last change. We must
stop searching for the right isdst value before stepping to the
initial value.
* malloc/malloc.c: Make sure calloc really returned zeroed memory.
Patch by Wolfram Gloger <wmglo@dent.med.uni-muenchen.de>.

44
time/mktime.c
View File

@ -350,44 +350,32 @@ __mktime_internal (tp, convert, offset)
/* If we have a match, check whether tm.tm_isdst has the requested
value, if any. */
if (dt == 0 && isdst >= 0 && isdst != tm.tm_isdst)
if (dt == 0 && 0 <= isdst && 0 <= tm.tm_isdst)
{
int dst_diff = (isdst != 0) - (tm.tm_isdst != 0);
if (dst_diff)
{
/* Move three hours in the direction indicated by the disagreement,
/* Move two 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.
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;
once, in Newfoundland, 1988-10-30 02:00 -> 00:00. */
time_t ot = t - 2 * 60 * 60 * dst_diff;
while (--remaining_probes != 0)
{
if (! (dt = ydhms_tm_diff (year, yday, hour, min, sec,
ranged_convert (convert, &ot,
&tmptm)))
|| tmptm.tm_isdst != isdst)
break;
otm = tmptm;
ot += dt;
if (ot == t)
struct tm otm;
dt = ydhms_tm_diff (year, yday, hour, min, sec,
ranged_convert (convert, &ot, &otm));
if (dt == 0
|| (ot + dt == t
&& dst_diff == (isdst != 0) - (tm.tm_isdst != 0)))
{
t = ot;
tm = otm;
break;
}
if ((ot += dt) == t)
break; /* Avoid a redundant probe. */
}
if (otm.tm_isdst != -1)
{
t = ot;
tm = otm;
}
}
}