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Sync our copy of the timezone library with IANA release tzcode2017b.

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zic no longer mishandles some transitions in January 2038 when it
attempts to work around Qt bug 53071.  This fixes a bug affecting
Pacific/Tongatapu that was introduced in zic 2016e.  localtime.c
now contains a workaround, useful when loading a file generated by
a buggy zic.

There are assorted cosmetic changes as well, notably relocation
of a bunch of #defines.
This commit is contained in:
Tom Lane
2017-04-30 15:13:51 -04:00
parent 12d11432b4
commit e18b2c480d
7 changed files with 139 additions and 99 deletions
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15
src/timezone/zic.c
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@ -2671,6 +2671,9 @@ outzone(const struct zone * zpfirst, ptrdiff_t zonecount)
bool do_extend;
char version;
ptrdiff_t lastatmax = -1;
zic_t one = 1;
zic_t y2038_boundary = one << 31;
zic_t max_year0;
max_abbr_len = 2 + max_format_len + max_abbrvar_len;
max_envvar_len = 2 * max_abbr_len + 5 * 9;
@ -2780,12 +2783,13 @@ outzone(const struct zone * zpfirst, ptrdiff_t zonecount)
}
/*
* For the benefit of older systems, generate data from 1900 through 2037.
* For the benefit of older systems, generate data from 1900 through 2038.
*/
if (min_year > 1900)
min_year = 1900;
if (max_year < 2037)
max_year = 2037;
max_year0 = max_year;
if (max_year < 2038)
max_year = 2038;
for (i = 0; i < zonecount; ++i)
{
/*
@ -2835,7 +2839,12 @@ outzone(const struct zone * zpfirst, ptrdiff_t zonecount)
year <= rp->r_hiyear &&
yearistype(year, rp->r_yrtype);
if (rp->r_todo)
{
rp->r_temp = rpytime(rp, year);
rp->r_todo
= (rp->r_temp < y2038_boundary
|| year <= max_year0);
}
}
for (;;)
{