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Sync our copy of the timezone library with IANA release tzcode2020a.

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This absorbs a leap-second-related bug fix in localtime.c, and
teaches zic to handle an expiration marker in the leapseconds file.
Neither are of any interest to us (for the foreseeable future
anyway), but we need to stay more or less in sync with upstream.

Also adjust some over-eager changes in the README from commit 957338418.
I have no intention of making changes that require C99 in this code,
until such time as all the live back branches require C99.  Otherwise
back-patching will get too exciting.

For the same reason, absorb assorted whitespace and other cosmetic
changes from HEAD into the back branches; mostly this reflects use of
improved versions of pgindent.

All in all then, quite a boring update.  But I figured I'd get it
done while I was looking at this code.
This commit is contained in:
Tom Lane
2020-06-17 18:29:29 -04:00
parent 6924c37f77
commit d8b15eeb8a
3 changed files with 143 additions and 69 deletions
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23
src/timezone/localtime.c
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@ -92,6 +92,7 @@ struct rule
static struct pg_tm *gmtsub(pg_time_t const *, int32, struct pg_tm *);
static bool increment_overflow(int *, int);
static bool increment_overflow_time(pg_time_t *, int32);
static int64 leapcorr(struct state const *, pg_time_t);
static struct pg_tm *timesub(pg_time_t const *, int32, struct state const *,
struct pg_tm *);
static bool typesequiv(struct state const *, int, int);
@ -477,12 +478,14 @@ tzloadbody(char const *name, char *canonname, struct state *sp, bool doextend,
for (i = 0; i < ts->timecnt; i++)
if (sp->timecnt == 0
|| sp->ats[sp->timecnt - 1] < ts->ats[i])
|| (sp->ats[sp->timecnt - 1]
< ts->ats[i] + leapcorr(sp, ts->ats[i])))
break;
while (i < ts->timecnt
&& sp->timecnt < TZ_MAX_TIMES)
{
sp->ats[sp->timecnt] = ts->ats[i];
sp->ats[sp->timecnt]
= ts->ats[i] + leapcorr(sp, ts->ats[i]);
sp->types[sp->timecnt] = (sp->typecnt
+ ts->types[i]);
sp->timecnt++;
@ -1601,6 +1604,22 @@ increment_overflow_time(pg_time_t *tp, int32 j)
return false;
}
static int64
leapcorr(struct state const *sp, pg_time_t t)
{
struct lsinfo const *lp;
int i;
i = sp->leapcnt;
while (--i >= 0)
{
lp = &sp->lsis[i];
if (t >= lp->ls_trans)
return lp->ls_corr;
}
return 0;
}
/*
* Find the next DST transition time in the given zone after the given time
*