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[BZ #1140]

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2007-10-14  Ulrich Drepper  <drepper@redhat.com>
	[BZ #1140]
	* time/tzfile.c (__tzfile_compute): Compute tzname[] values based
	on the specified time and not the last entries in the file.  Move
	code to determine tzname[] to...
	(find_transition): ...here.  Add ugly guess for times before the
	first transition.
This commit is contained in:
Ulrich Drepper 2007-10-14 07:03:01 +00:00
parent cfca0aa397
commit 89dc9d4c5b
2 changed files with 59 additions and 20 deletions
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9
ChangeLog
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@ -1,3 +1,12 @@
2007-10-14 Ulrich Drepper <drepper@redhat.com>
[BZ #1140]
* time/tzfile.c (__tzfile_compute): Compute tzname[] values based
on the specified time and not the last entries in the file. Move
code to determine tzname[] to...
(find_transition): ...here. Add ugly guess for times before the
first transition.
2007-10-13 Ulrich Drepper <drepper@redhat.com>
[BZ #3195]

68
time/tzfile.c
View File

@ -1,4 +1,4 @@
/* Copyright (C) 1991-1993,1995-2001,2003,2004,2006
/* Copyright (C) 1991-1993,1995-2001,2003,2004,2006, 2007
Free Software Foundation, Inc.
This file is part of the GNU C Library.
@ -50,7 +50,6 @@ struct leap
long int change; /* Seconds of correction to apply. */
};
static struct ttinfo *find_transition (time_t timer) internal_function;
static void compute_tzname_max (size_t) internal_function;
static size_t num_transitions;
@ -537,6 +536,9 @@ find_transition (time_t timer)
{
size_t i;
__tzname[0] = NULL;
__tzname[1] = NULL;
if (num_transitions == 0 || timer < transitions[0])
{
/* TIMER is before any transition (or there are no transitions).
@ -544,12 +546,34 @@ find_transition (time_t timer)
(or the first if they're all DST types). */
i = 0;
while (i < num_types && types[i].isdst)
{
if (__tzname[1] == NULL)
__tzname[1] = __tzstring (&zone_names[types[i].idx]);
++i;
}
if (i == num_types)
i = 0;
__tzname[0] = __tzstring (&zone_names[types[i].idx]);
if (__tzname[1] == NULL)
{
size_t j = i;
while (j < num_types)
if (types[j].isdst)
{
__tzname[1] = __tzstring (&zone_names[types[j].idx]);
break;
}
else
++j;
}
}
else if (timer >= transitions[num_transitions - 1])
i = type_idxs[num_transitions - 1];
{
i = num_transitions - 1;
goto found;
}
else
{
/* Find the first transition after TIMER, and
@ -602,6 +626,26 @@ find_transition (time_t timer)
found:
/* assert (timer >= transitions[i - 1] && timer < transitions[i]); */
__tzname[types[type_idxs[i - 1]].isdst]
= __tzstring (&zone_names[types[type_idxs[i - 1]].idx]);
size_t j = i;
while (j < num_transitions)
{
int type = type_idxs[j];
int dst = types[type].isdst;
int idx = types[type].idx;
if (__tzname[dst] == NULL)
{
__tzname[dst] = __tzstring (&zone_names[idx]);
if (__tzname[1 - dst] != NULL)
break;
}
++j;
}
i = type_idxs[i - 1];
}
@ -620,22 +664,7 @@ __tzfile_compute (time_t timer, int use_localtime,
struct ttinfo *info = find_transition (timer);
__daylight = rule_stdoff != rule_dstoff;
__timezone = -rule_stdoff;
__tzname[0] = NULL;
__tzname[1] = NULL;
for (i = num_transitions; i > 0; )
{
int type = type_idxs[--i];
int dst = types[type].isdst;
int idx = types[type].idx;
if (__tzname[dst] == NULL)
{
__tzname[dst] = __tzstring (&zone_names[idx]);
if (__tzname[1 - dst] != NULL)
break;
}
}
if (__tzname[0] == NULL)
{
/* This should only happen if there are no transition rules.
@ -647,7 +676,8 @@ __tzfile_compute (time_t timer, int use_localtime,
/* There is no daylight saving time. */
__tzname[1] = __tzname[0];
tp->tm_isdst = info->isdst;
tp->tm_zone = __tzstring (&zone_names[info->idx]);
assert (strcmp (&zone_names[info->idx], __tzname[tp->tm_isdst]) == 0);
tp->tm_zone = __tzname[tp->tm_isdst];
tp->tm_gmtoff = info->offset;
}