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(__tzfile_read): Read POSIX TZ string if available even when time_t is 32-bit. (__tzfile_compute): Override POSIX TZ string STD/DST zone names if timezone data read by __tzfile_default. Ensure __tzname[0] is always set after the search.

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This commit is contained in:
Ulrich Drepper 2007-10-17 14:44:26 +00:00
parent 96c06e084b
commit c6d381d3b3
1 changed files with 57 additions and 6 deletions
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63
time/tzfile.c
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@ -371,15 +371,53 @@ __tzfile_read (const char *file, size_t extra, char **extrap)
types[i++].isgmt = 0;
/* Read the POSIX TZ-style information if possible. */
if (tzspec != NULL)
if (sizeof (time_t) == 8 && tzspec != NULL)
{
/* Skip over the newline first. */
if (getc_unlocked (f) != '\n'
|| fread_unlocked (tzspec, 1, tzspec_len - 1, f) != tzspec_len - 1)
|| (fread_unlocked (tzspec, 1, tzspec_len - 1, f)
!= tzspec_len - 1))
tzspec = NULL;
else
tzspec[tzspec_len - 1] = '\0';
}
else if (sizeof (time_t) == 4 && tzhead.tzh_version != '\0')
{
/* Get the TZ string. */
if (__builtin_expect (fread_unlocked ((void *) &tzhead, sizeof (tzhead),
1, f) != 1, 0)
|| (memcmp (tzhead.tzh_magic, TZ_MAGIC, sizeof (tzhead.tzh_magic))
!= 0))
goto lose;
size_t num_transitions2 = (size_t) decode (tzhead.tzh_timecnt);
size_t num_types2 = (size_t) decode (tzhead.tzh_typecnt);
size_t chars2 = (size_t) decode (tzhead.tzh_charcnt);
size_t num_leaps2 = (size_t) decode (tzhead.tzh_leapcnt);
size_t num_isstd2 = (size_t) decode (tzhead.tzh_ttisstdcnt);
size_t num_isgmt2 = (size_t) decode (tzhead.tzh_ttisgmtcnt);
/* Position the stream before the second header. */
size_t to_skip = (num_transitions2 * (8 + 1)
+ num_types2 * 6
+ chars2
+ num_leaps2 * 12
+ num_isstd2
+ num_isgmt2);
off_t off;
if (fseek (f, to_skip, SEEK_CUR) != 0
|| (off = ftello (f)) < 0
|| st.st_size < off + 2)
goto lose;
tzspec_len = st.st_size - off - 1;
char *tzstr = alloca (tzspec_len);
if (getc_unlocked (f) != '\n'
|| (fread_unlocked (tzstr, 1, tzspec_len - 1, f) != tzspec_len - 1))
goto lose;
tzstr[tzspec_len - 1] = '\0';
tzspec = __tzstring (tzstr);
}
fclose (f);
@ -561,7 +599,7 @@ __tzfile_compute (time_t timer, int use_localtime,
__tzname[0] = NULL;
__tzname[1] = NULL;
if (num_transitions == 0 || timer < transitions[0])
if (__builtin_expect (num_transitions == 0 || timer < transitions[0], 0))
{
/* TIMER is before any transition (or there are no transitions).
Choose the first non-DST type
@ -591,9 +629,9 @@ __tzfile_compute (time_t timer, int use_localtime,
++j;
}
}
else if (timer >= transitions[num_transitions - 1])
else if (__builtin_expect (timer >= transitions[num_transitions - 1], 0))
{
if (tzspec == NULL)
if (__builtin_expect (tzspec == NULL, 0))
{
use_last:
i = num_transitions;
@ -605,12 +643,22 @@ __tzfile_compute (time_t timer, int use_localtime,
/* Convert to broken down structure. If this fails do not
use the string. */
if (! __offtime (&timer, 0, tp))
if (__builtin_expect (! __offtime (&timer, 0, tp), 0))
goto use_last;
/* Use the rules from the TZ string to compute the change. */
__tz_compute (timer, tp, 1);
/* If tzspec comes from posixrules loaded by __tzfile_default,
override the STD and DST zone names with the ones user
requested in TZ envvar. */
if (__builtin_expect (zone_names == (char *) &leaps[num_leaps], 0))
{
assert (num_types == 2);
__tzname[0] = __tzstring (zone_names);
__tzname[1] = __tzstring (&zone_names[strlen (zone_names) + 1]);
}
*leap_correct = 0L;
*leap_hit = 0;
return;
@ -688,6 +736,9 @@ __tzfile_compute (time_t timer, int use_localtime,
++j;
}
if (__builtin_expect (__tzname[0] == NULL, 0))
__tzname[0] = __tzname[1];
i = type_idxs[i - 1];
}