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Update timezone code to track the upstream changes since 2003. In particular

Browse Source 
this adds support for 64-bit tzdata files, which is needed to support DST
calculations beyond 2038.  Add a regression test case to give some minimal
confidence that that really works.

Heikki Linnakangas
REL8_5_ALPHA1_BRANCH
Tom Lane 18 years ago
parent 2f67722dda
commit 0171e72d4d
12 changed files with 1342 additions and 435 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 25
      src/test/regress/expected/timestamptz.out
  2. 7
      src/test/regress/sql/timestamptz.sql
  3. 10
      src/timezone/README
  4. 4
      src/timezone/ialloc.c
  5. 599
      src/timezone/localtime.c
  6. 9
      src/timezone/pgtz.c
  7. 7
      src/timezone/pgtz.h
  8. 54
      src/timezone/private.h
  9. 11
      src/timezone/scheck.c
  10. 79
      src/timezone/strftime.c
  11. 40
      src/timezone/tzfile.h
  12. 932
      src/timezone/zic.c

25
src/test/regress/expected/timestamptz.out
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@ -114,6 +114,31 @@ INSERT INTO TIMESTAMPTZ_TBL VALUES ('19970710 173201 America/Does_not_exist');
ERROR: time zone "america/does_not_exist" not recognized
SELECT '19970710 173201' AT TIME ZONE 'America/Does_not_exist';
ERROR: time zone "America/Does_not_exist" not recognized
-- Daylight saving time for timestamps beyond 32-bit time_t range.
SELECT '20500710 173201 Europe/Helsinki'::timestamptz; -- DST
timestamptz
------------------------------
Sun Jul 10 07:32:01 2050 PDT
(1 row)
SELECT '20500110 173201 Europe/Helsinki'::timestamptz; -- non-DST
timestamptz
------------------------------
Mon Jan 10 07:32:01 2050 PST
(1 row)
SELECT '205000-07-10 17:32:01 Europe/Helsinki'::timestamptz; -- DST
timestamptz
--------------------------------
Thu Jul 10 07:32:01 205000 PDT
(1 row)
SELECT '205000-01-10 17:32:01 Europe/Helsinki'::timestamptz; -- non-DST
timestamptz
--------------------------------
Fri Jan 10 07:32:01 205000 PST
(1 row)
-- Check date conversion and date arithmetic
INSERT INTO TIMESTAMPTZ_TBL VALUES ('1997-06-10 18:32:01 PDT');
INSERT INTO TIMESTAMPTZ_TBL VALUES ('Feb 10 17:32:01 1997');

7
src/test/regress/sql/timestamptz.sql
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@ -86,6 +86,13 @@ SELECT '19970710 173201' AT TIME ZONE 'America/New_York';
INSERT INTO TIMESTAMPTZ_TBL VALUES ('19970710 173201 America/Does_not_exist');
SELECT '19970710 173201' AT TIME ZONE 'America/Does_not_exist';
-- Daylight saving time for timestamps beyond 32-bit time_t range.
SELECT '20500710 173201 Europe/Helsinki'::timestamptz; -- DST
SELECT '20500110 173201 Europe/Helsinki'::timestamptz; -- non-DST
SELECT '205000-07-10 17:32:01 Europe/Helsinki'::timestamptz; -- DST
SELECT '205000-01-10 17:32:01 Europe/Helsinki'::timestamptz; -- non-DST
-- Check date conversion and date arithmetic
INSERT INTO TIMESTAMPTZ_TBL VALUES ('1997-06-10 18:32:01 PDT');

10
src/timezone/README
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@ -1,10 +1,12 @@
This is a PostgreSQL adapted version of the timezone library
from:
This is a PostgreSQL adapted version of the timezone library from:
ftp://elsie.nci.nih.gov/pub/tzcode*.tar.gz
The data files under data/ are an exact copy of the latest data set
from
The code is currently synced with release 2007k. There are many cosmetic
(and not so cosmetic) differences from the original tzcode library, but
diffs in the upstream version should usually be propagated to our version.
The data files under data/ are an exact copy of the latest data set from:
ftp://elsie.nci.nih.gov/pub/tzdata*.tar.gz

4
src/timezone/ialloc.c
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@ -1,9 +1,9 @@
/*
* This file is in the public domain, so clarified as of
* 1996-06-05 by Arthur David Olson (arthur_david_olson@nih.gov).
* 2006-07-17 by Arthur David Olson.
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/timezone/ialloc.c,v 1.9 2007/10/26 13:30:10 tgl Exp $
* $PostgreSQL: pgsql/src/timezone/ialloc.c,v 1.10 2008/02/16 21:16:04 tgl Exp $
*/
#include "postgres_fe.h"

599
src/timezone/localtime.c
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@ -1,15 +1,14 @@
/*
* This file is in the public domain, so clarified as of
* 1996-06-05 by Arthur David Olson (arthur_david_olson@nih.gov).
* 1996-06-05 by Arthur David Olson.
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/timezone/localtime.c,v 1.19 2007/11/15 21:14:46 momjian Exp $
* $PostgreSQL: pgsql/src/timezone/localtime.c,v 1.20 2008/02/16 21:16:04 tgl Exp $
*/
/*
* Leap second handling from Bradley White (bww@k.gp.cs.cmu.edu).
* POSIX-style TZ environment variable handling from Guy Harris
* (guy@auspex.com).
* Leap second handling from Bradley White.
* POSIX-style TZ environment variable handling from Guy Harris.
*/
/* this file needs to build in both frontend and backend contexts */
@ -36,9 +35,9 @@
* 5. They might reference tm.TM_ZONE after calling offtime.
* What's best to do in the above cases is open to debate;
* for now, we just set things up so that in any of the five cases
* WILDABBR is used. Another possibility: initialize tzname[0] to the
* WILDABBR is used. Another possibility: initialize tzname[0] to the
* string "tzname[0] used before set", and similarly for the other cases.
* And another: initialize tzname[0] to "ERA", with an explanation in the
* And another: initialize tzname[0] to "ERA", with an explanation in the
* manual page of what this "time zone abbreviation" means (doing this so
* that tzname[0] has the "normal" length of three characters).
*----------
@ -46,7 +45,7 @@
#define WILDABBR " "
#endif /* !defined WILDABBR */
static char wildabbr[] = "WILDABBR";
static char wildabbr[] = WILDABBR;
static const char gmt[] = "GMT";
@ -77,18 +76,25 @@ struct rule
*/
static long detzcode(const char *codep);
static pg_time_t detzcode64(const char *codep);
static int differ_by_repeat(pg_time_t t1, pg_time_t t0);
static const char *getzname(const char *strp);
static const char *getqzname(const char *strp, int delim);
static const char *getnum(const char *strp, int *nump, int min, int max);
static const char *getsecs(const char *strp, long *secsp);
static const char *getoffset(const char *strp, long *offsetp);
static const char *getrule(const char *strp, struct rule * rulep);
static void gmtload(struct state * sp);
static void gmtsub(const pg_time_t *timep, long offset, struct pg_tm * tmp);
static void localsub(const pg_time_t *timep, long offset, struct pg_tm * tmp, const pg_tz *tz);
static void timesub(const pg_time_t *timep, long offset,
const struct state * sp, struct pg_tm * tmp);
static struct pg_tm *gmtsub(const pg_time_t *timep, long offset,
struct pg_tm *tmp);
static struct pg_tm *localsub(const pg_time_t *timep, long offset,
struct pg_tm *tmp, const pg_tz *tz);
static int increment_overflow(int *number, int delta);
static pg_time_t transtime(pg_time_t janfirst, int year,
const struct rule * rulep, long offset);
const struct rule *rulep, long offset);
static int typesequiv(const struct state *sp, int a, int b);
static struct pg_tm *timesub(const pg_time_t *timep, long offset,
const struct state *sp, struct pg_tm *tmp);
/* GMT timezone */
static struct state gmtmem;
@ -103,7 +109,7 @@ static int gmt_is_set = 0;
* Except for the strftime function, these functions [asctime,
* ctime, gmtime, localtime] return values in one of two static
* objects: a broken-down time structure and an array of char.
* Thanks to Paul Eggert (eggert@twinsun.com) for noting this.
* Thanks to Paul Eggert for noting this.
*/
static struct pg_tm tm;
@ -115,18 +121,48 @@ detzcode(const char *codep)
long result;
int i;
result = (codep[0] & 0x80) ? ~0L : 0L;
result = (codep[0] & 0x80) ? ~0L : 0;
for (i = 0; i < 4; ++i)
result = (result << 8) | (codep[i] & 0xff);
return result;
}
static pg_time_t
detzcode64(const char *codep)
{
pg_time_t result;
int i;
result = (codep[0] & 0x80) ? (~(int64) 0) : 0;
for (i = 0; i < 8; ++i)
result = result * 256 + (codep[i] & 0xff);
return result;
}
static int
differ_by_repeat(pg_time_t t1, pg_time_t t0)
{
if (TYPE_INTEGRAL(pg_time_t) &&
TYPE_BIT(pg_time_t) - TYPE_SIGNED(pg_time_t) < SECSPERREPEAT_BITS)
return 0;
return t1 - t0 == SECSPERREPEAT;
}
int
tzload(const char *name, char *canonname, struct state * sp)
tzload(const char *name, char *canonname, struct state * sp, int doextend)
{
const char *p;
int i;
int fid;
int stored;
int nread;
union
{
struct tzhead tzhead;
char buf[2 * sizeof(struct tzhead) +
2 * sizeof *sp +
4 * TZ_MAX_TIMES];
} u;
if (name == NULL && (name = TZDEFAULT) == NULL)
return -1;
@ -135,19 +171,14 @@ tzload(const char *name, char *canonname, struct state * sp)
fid = pg_open_tzfile(name, canonname);
if (fid < 0)
return -1;
nread = read(fid, u.buf, sizeof u.buf);
if (close(fid) != 0 || nread <= 0)
return -1;
for (stored = 4; stored <= 8; stored *= 2)
{
struct tzhead *tzhp;
union
{
struct tzhead tzhead;
char buf[sizeof *sp + sizeof *tzhp];
} u;
int ttisstdcnt;
int ttisgmtcnt;
i = read(fid, u.buf, sizeof u.buf);
if (close(fid) != 0)
return -1;
ttisstdcnt = (int) detzcode(u.tzhead.tzh_ttisstdcnt);
ttisgmtcnt = (int) detzcode(u.tzhead.tzh_ttisgmtcnt);
sp->leapcnt = (int) detzcode(u.tzhead.tzh_leapcnt);
@ -162,18 +193,19 @@ tzload(const char *name, char *canonname, struct state * sp)
(ttisstdcnt != sp->typecnt && ttisstdcnt != 0) ||
(ttisgmtcnt != sp->typecnt && ttisgmtcnt != 0))
return -1;
if (i - (p - u.buf) < sp->timecnt * 4 + /* ats */
if (nread - (p - u.buf) <
sp->timecnt * stored + /* ats */
sp->timecnt + /* types */
sp->typecnt * (4 + 2) + /* ttinfos */
sp->typecnt * 6 + /* ttinfos */
sp->charcnt + /* chars */
sp->leapcnt * (4 + 4) + /* lsinfos */
sp->leapcnt * (stored + 4) + /* lsinfos */
ttisstdcnt + /* ttisstds */
ttisgmtcnt) /* ttisgmts */
return -1;
for (i = 0; i < sp->timecnt; ++i)
{
sp->ats[i] = detzcode(p);
p += 4;
sp->ats[i] = (stored == 4) ? detzcode(p) : detzcode64(p);
p += stored;
}
for (i = 0; i < sp->timecnt; ++i)
{
@ -204,8 +236,8 @@ tzload(const char *name, char *canonname, struct state * sp)
struct lsinfo *lsisp;
lsisp = &sp->lsis[i];
lsisp->ls_trans = detzcode(p);
p += 4;
lsisp->ls_trans = (stored == 4) ? detzcode(p) : detzcode64(p);
p += stored;
lsisp->ls_corr = detzcode(p);
p += 4;
}
@ -239,10 +271,127 @@ tzload(const char *name, char *canonname, struct state * sp)
return -1;
}
}
/*
* Out-of-sort ats should mean we're running on a
* signed time_t system but using a data file with
* unsigned values (or vice versa).
*/
for (i = 0; i < sp->timecnt - 2; ++i)
if (sp->ats[i] > sp->ats[i + 1])
{
++i;
if (TYPE_SIGNED(pg_time_t))
{
/*
* Ignore the end (easy).
*/
sp->timecnt = i;
}
else
{
/*
* Ignore the beginning (harder).
*/
int j;
for (j = 0; j + i < sp->timecnt; ++j)
{
sp->ats[j] = sp->ats[j + i];
sp->types[j] = sp->types[j + i];
}
sp->timecnt = j;
}
break;
}
/*
* If this is an old file, we're done.
*/
if (u.tzhead.tzh_version[0] == '\0')
break;
nread -= p - u.buf;
for (i = 0; i < nread; ++i)
u.buf[i] = p[i];
/*
* If this is a narrow integer time_t system, we're done.
*/
if (stored >= (int) sizeof(pg_time_t) && TYPE_INTEGRAL(pg_time_t))
break;
}
if (doextend && nread > 2 &&
u.buf[0] == '\n' && u.buf[nread - 1] == '\n' &&
sp->typecnt + 2 <= TZ_MAX_TYPES)
{
struct state ts;
int result;
u.buf[nread - 1] = '\0';
result = tzparse(&u.buf[1], &ts, FALSE);
if (result == 0 && ts.typecnt == 2 &&
sp->charcnt + ts.charcnt <= TZ_MAX_CHARS)
{
for (i = 0; i < 2; ++i)
ts.ttis[i].tt_abbrind +=
sp->charcnt;
for (i = 0; i < ts.charcnt; ++i)
sp->chars[sp->charcnt++] =
ts.chars[i];
i = 0;
while (i < ts.timecnt &&
ts.ats[i] <=
sp->ats[sp->timecnt - 1])
++i;
while (i < ts.timecnt &&
sp->timecnt < TZ_MAX_TIMES)
{
sp->ats[sp->timecnt] =
ts.ats[i];
sp->types[sp->timecnt] =
sp->typecnt +
ts.types[i];
++sp->timecnt;
++i;
}
sp->ttis[sp->typecnt++] = ts.ttis[0];
sp->ttis[sp->typecnt++] = ts.ttis[1];
}
}
i = 2 * YEARSPERREPEAT;
sp->goback = sp->goahead = sp->timecnt > i;
sp->goback = sp->goback &&
typesequiv(sp, sp->types[i], sp->types[0]) &&
differ_by_repeat(sp->ats[i], sp->ats[0]);
sp->goahead = sp->goahead &&
typesequiv(sp, sp->types[sp->timecnt - 1],
sp->types[sp->timecnt - 1 - i]) &&
differ_by_repeat(sp->ats[sp->timecnt - 1],
sp->ats[sp->timecnt - 1 - i]);
return 0;
}
static int
typesequiv(const struct state *sp, int a, int b)
{
int result;
if (sp == NULL ||
a < 0 || a >= sp->typecnt ||
b < 0 || b >= sp->typecnt)
result = FALSE;
else
{
const struct ttinfo *ap = &sp->ttis[a];
const struct ttinfo *bp = &sp->ttis[b];
result = ap->tt_gmtoff == bp->tt_gmtoff &&
ap->tt_isdst == bp->tt_isdst &&
ap->tt_ttisstd == bp->tt_ttisstd &&
ap->tt_ttisgmt == bp->tt_ttisgmt &&
strcmp(&sp->chars[ap->tt_abbrind],
&sp->chars[bp->tt_abbrind]) == 0;
}
return result;
}
static const int mon_lengths[2][MONSPERYEAR] = {
{31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
{31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}
@ -254,7 +403,7 @@ static const int year_lengths[2] = {
/*
* Given a pointer into a time zone string, scan until a character that is not
* a valid character in a zone name is found. Return a pointer to that
* a valid character in a zone name is found. Return a pointer to that
* character.
*/
static const char *
@ -268,6 +417,24 @@ getzname(const char *strp)
return strp;
}
/*
* Given a pointer into an extended time zone string, scan until the ending
* delimiter of the zone name is located. Return a pointer to the delimiter.
*
* As with getzname above, the legal character set is actually quite
* restricted, with other characters producing undefined results.
* We don't do any checking here; checking is done later in common-case code.
*/
static const char *
getqzname(const char *strp, int delim)
{
int c;
while ((c = *strp) != '\0' && c != delim)
++strp;
return strp;
}
/*
* Given a pointer into a time zone string, extract a number from that string.
* Check that the number is within a specified range; if it is not, return
@ -327,7 +494,7 @@ getsecs(const char *strp, long *secsp)
if (*strp == ':')
{
++strp;
/* `SECSPERMIN' allows for leap seconds. */
/* `SECSPERMIN' allows for leap seconds. */
strp = getnum(strp, &num, 0, SECSPERMIN);
if (strp == NULL)
return NULL;
@ -365,7 +532,7 @@ getoffset(const char *strp, long *offsetp)
/*
* Given a pointer into a time zone string, extract a rule in the form
* date[/time]. See POSIX section 8 for the format of "date" and "time".
* date[/time]. See POSIX section 8 for the format of "date" and "time".
* If a valid rule is not found, return NULL.
* Otherwise, return a pointer to the first character not part of the rule.
*/
@ -559,26 +726,47 @@ tzparse(const char *name, struct state * sp, int lastditch)
}
else
{
name = getzname(name);
stdlen = name - stdname;
if (stdlen < 3)
return -1;
if (*name == '<')
{
name++;
stdname = name;
name = getqzname(name, '>');
if (*name != '>')
return (-1);
stdlen = name - stdname;
name++;
}
else
{
name = getzname(name);
stdlen = name - stdname;
}
if (*name == '\0')
return -1;
name = getoffset(name, &stdoffset);
if (name == NULL)
return -1;
load_result = tzload(TZDEFRULES, NULL, sp);
load_result = tzload(TZDEFRULES, NULL, sp, FALSE);
}
if (load_result != 0)
sp->leapcnt = 0; /* so, we're off a little */
if (*name != '\0')
{
dstname = name;
name = getzname(name);
dstlen = name - dstname; /* length of DST zone name */
if (dstlen < 3)
return -1;
if (*name == '<')
{
dstname = ++name;
name = getqzname(name, '>');
if (*name != '>')
return -1;
dstlen = name - dstname;
name++;
}
else
{
dstname = name;
name = getzname(name);
dstlen = name - dstname; /* length of DST zone name */
}
if (*name != '\0' && *name != ',' && *name != ';')
{
name = getoffset(name, &dstoffset);
@ -610,11 +798,8 @@ tzparse(const char *name, struct state * sp, int lastditch)
sp->typecnt = 2; /* standard time and DST */
/*
* Two transitions per year, from EPOCH_YEAR to 2037.
* Two transitions per year, from EPOCH_YEAR forward.
*/
sp->timecnt = 2 * (2037 - EPOCH_YEAR + 1);
if (sp->timecnt > TZ_MAX_TIMES)
return -1;
sp->ttis[0].tt_gmtoff = -dstoffset;
sp->ttis[0].tt_isdst = 1;
sp->ttis[0].tt_abbrind = stdlen + 1;
@ -624,8 +809,13 @@ tzparse(const char *name, struct state * sp, int lastditch)
atp = sp->ats;
typep = sp->types;
janfirst = 0;
for (year = EPOCH_YEAR; year <= 2037; ++year)
sp->timecnt = 0;
for (year = EPOCH_YEAR;
sp->timecnt + 2 <= TZ_MAX_TIMES;
++year)
{
pg_time_t newfirst;
starttime = transtime(janfirst, year, &start,
stdoffset);
endtime = transtime(janfirst, year, &end,
@ -644,8 +834,13 @@ tzparse(const char *name, struct state * sp, int lastditch)
*atp++ = endtime;
*typep++ = 1; /* DST ends */
}
janfirst += year_lengths[isleap(year)] *
sp->timecnt += 2;
newfirst = janfirst;
newfirst += year_lengths[isleap(year)] *
SECSPERDAY;
if (newfirst <= janfirst)
break;
janfirst = newfirst;
}
}
else
@ -776,7 +971,7 @@ tzparse(const char *name, struct state * sp, int lastditch)
static void
gmtload(struct state * sp)
{
if (tzload(gmt, NULL, sp) != 0)
if (tzload(gmt, NULL, sp, TRUE) != 0)
(void) tzparse(gmt, sp, TRUE);
}
@ -784,20 +979,63 @@ gmtload(struct state * sp)
/*
* The easy way to behave "as if no library function calls" localtime
* is to not call it--so we drop its guts into "localsub", which can be
* freely called. (And no, the PANS doesn't require the above behavior--
* freely called. (And no, the PANS doesn't require the above behavior--
* but it *is* desirable.)
*
* The unused offset argument is for the benefit of mktime variants.
*/
static void
localsub(const pg_time_t *timep, long offset, struct pg_tm * tmp, const pg_tz *tz)
static struct pg_tm *
localsub(const pg_time_t *timep, long offset,
struct pg_tm *tmp, const pg_tz *tz)
{
const struct state *sp;
const struct ttinfo *ttisp;
int i;
struct pg_tm *result;
const pg_time_t t = *timep;
sp = &tz->state;
if ((sp->goback && t < sp->ats[0]) ||
(sp->goahead && t > sp->ats[sp->timecnt - 1]))
{
pg_time_t newt = t;
pg_time_t seconds;
pg_time_t tcycles;
int64 icycles;
if (t < sp->ats[0])
seconds = sp->ats[0] - t;
else seconds = t - sp->ats[sp->timecnt - 1];
--seconds;
tcycles = seconds / YEARSPERREPEAT / AVGSECSPERYEAR;
++tcycles;
icycles = tcycles;
if (tcycles - icycles >= 1 || icycles - tcycles >= 1)
return NULL;
seconds = icycles;
seconds *= YEARSPERREPEAT;
seconds *= AVGSECSPERYEAR;
if (t < sp->ats[0])
newt += seconds;
else newt -= seconds;
if (newt < sp->ats[0] ||
newt > sp->ats[sp->timecnt - 1])
return NULL; /* "cannot happen" */
result = localsub(&newt, offset, tmp, tz);
if (result == tmp)
{
pg_time_t newy;
newy = tmp->tm_year;
if (t < sp->ats[0])
newy -= icycles * YEARSPERREPEAT;
else newy += icycles * YEARSPERREPEAT;
tmp->tm_year = newy;
if (tmp->tm_year != newy)
return NULL;
}
return result;
}
if (sp->timecnt == 0 || t < sp->ats[0])
{
i = 0;
@ -810,39 +1048,49 @@ localsub(const pg_time_t *timep, long offset, struct pg_tm * tmp, const pg_tz *t
}
else
{
for (i = 1; i < sp->timecnt; ++i)
if (t < sp->ats[i])
break;
i = sp->types[i - 1];
int lo = 1;
int hi = sp->timecnt;
while (lo < hi)
{
int mid = (lo + hi) >> 1;
if (t < sp->ats[mid])
hi = mid;
else lo = mid + 1;
}
i = (int) sp->types[lo - 1];
}
ttisp = &sp->ttis[i];
timesub(&t, ttisp->tt_gmtoff, sp, tmp);
result = timesub(&t, ttisp->tt_gmtoff, sp, tmp);
tmp->tm_isdst = ttisp->tt_isdst;
tmp->tm_zone = &sp->chars[ttisp->tt_abbrind];
return result;
}
struct pg_tm *
pg_localtime(const pg_time_t *timep, const pg_tz *tz)
{
localsub(timep, 0L, &tm, tz);
return &tm;
return localsub(timep, 0L, &tm, tz);
}
/*
* gmtsub is to gmtime as localsub is to localtime.
*/
static void
gmtsub(const pg_time_t *timep, long offset, struct pg_tm * tmp)
static struct pg_tm *
gmtsub(const pg_time_t *timep, long offset, struct pg_tm *tmp)
{
struct pg_tm *result;
if (!gmt_is_set)
{
gmt_is_set = TRUE;
gmtload(gmtptr);
}
timesub(timep, offset, gmtptr, tmp);
result = timesub(timep, offset, gmtptr, tmp);
/*
* Could get fancy here and deliver something such as "UTC+xxxx" or
@ -853,28 +1101,37 @@ gmtsub(const pg_time_t *timep, long offset, struct pg_tm * tmp)
tmp->tm_zone = wildabbr;
else
tmp->tm_zone = gmtptr->chars;
return result;
}
struct pg_tm *
pg_gmtime(const pg_time_t *timep)
{
gmtsub(timep, 0L, &tm);
return &tm;
return gmtsub(timep, 0L, &tm);
}
/*
* Return the number of leap years through the end of the given year
* where, to make the math easy, the answer for year zero is defined as zero.
*/
static int
leaps_thru_end_of(const int y)
{
return (y >= 0) ? (y / 4 - y / 100 + y / 400) :
-(leaps_thru_end_of(-(y + 1)) + 1);
}
static void
static struct pg_tm *
timesub(const pg_time_t *timep, long offset,
const struct state * sp, struct pg_tm * tmp)
const struct state *sp, struct pg_tm *tmp)
{
const struct lsinfo *lp;
/* expand days to 64 bits to support full Julian-day range */
int64 days;
int idays;
pg_time_t tdays;
int idays; /* unsigned would be so 2003 */
long rem;
int y;
int yleap;
const int *ip;
long corr;
int hit;
@ -907,74 +1164,111 @@ timesub(const pg_time_t *timep, long offset,
break;
}
}
days = *timep / SECSPERDAY;
rem = *timep % SECSPERDAY;
#ifdef mc68k
if (*timep == 0x80000000)
y = EPOCH_YEAR;
tdays = *timep / SECSPERDAY;
rem = *timep - tdays * SECSPERDAY;
while (tdays < 0 || tdays >= year_lengths[isleap(y)])
{
/*
* A 3B1 muffs the division on the most negative number.
*/
days = -24855;
rem = -11648;
int newy;
pg_time_t tdelta;
int idelta;
int leapdays;
tdelta = tdays / DAYSPERLYEAR;
idelta = tdelta;
if (tdelta - idelta >= 1 || idelta - tdelta >= 1)
return NULL;
if (idelta == 0)
idelta = (tdays < 0) ? -1 : 1;
newy = y;
if (increment_overflow(&newy, idelta))
return NULL;
leapdays = leaps_thru_end_of(newy - 1) -
leaps_thru_end_of(y - 1);
tdays -= ((pg_time_t) newy - y) * DAYSPERNYEAR;
tdays -= leapdays;
y = newy;
}
{
long seconds;
seconds = tdays * SECSPERDAY + 0.5;
tdays = seconds / SECSPERDAY;
rem += seconds - tdays * SECSPERDAY;
}
#endif /* defined mc68k */
rem += (offset - corr);
/*
* Given the range, we can now fearlessly cast...
*/
idays = tdays;
rem += offset - corr;
while (rem < 0)
{
rem += SECSPERDAY;
--days;
--idays;
}
while (rem >= SECSPERDAY)
{
rem -= SECSPERDAY;
++days;
++idays;
}
tmp->tm_hour = (int) (rem / SECSPERHOUR);
rem = rem % SECSPERHOUR;
tmp->tm_min = (int) (rem / SECSPERMIN);
while (idays < 0)
{
if (increment_overflow(&y, -1))
return NULL;
idays += year_lengths[isleap(y)];
}
while (idays >= year_lengths[isleap(y)])
{
idays -= year_lengths[isleap(y)];
if (increment_overflow(&y, 1))
return NULL;
}
tmp->tm_year = y;
if (increment_overflow(&tmp->tm_year, -TM_YEAR_BASE))
return NULL;
tmp->tm_yday = idays;
/*
* A positive leap second requires a special representation. This uses
* "... ??:59:60" et seq.
* The "extra" mods below avoid overflow problems.
*/
tmp->tm_sec = (int) (rem % SECSPERMIN) + hit;
tmp->tm_wday = (int) ((EPOCH_WDAY + days) % DAYSPERWEEK);
tmp->tm_wday = EPOCH_WDAY +
((y - EPOCH_YEAR) % DAYSPERWEEK) *
(DAYSPERNYEAR % DAYSPERWEEK) +
leaps_thru_end_of(y - 1) -
leaps_thru_end_of(EPOCH_YEAR - 1) +
idays;
tmp->tm_wday %= DAYSPERWEEK;
if (tmp->tm_wday < 0)
tmp->tm_wday += DAYSPERWEEK;
y = EPOCH_YEAR;
tmp->tm_hour = (int) (rem / SECSPERHOUR);
rem %= SECSPERHOUR;
tmp->tm_min = (int) (rem / SECSPERMIN);
/*
* Note: the point of adding 4800 is to ensure we make the same
* assumptions as Postgres' Julian-date routines about the placement of
* leap years in centuries BC, at least back to 4713BC which is as far as
* we'll go. This is effectively extending Gregorian timekeeping into
* pre-Gregorian centuries, which is a tad bogus but it conforms to the
* SQL spec...
* A positive leap second requires a special representation. This uses
* "... ??:59:60" et seq.
*/
#define LEAPS_THRU_END_OF(y) (((y) + 4800) / 4 - ((y) + 4800) / 100 + ((y) + 4800) / 400)
while (days < 0 || days >= (int64) year_lengths[yleap = isleap(y)])
{
int newy;
newy = y + days / DAYSPERNYEAR;
if (days < 0)
--newy;
days -= ((int64) (newy - y)) * DAYSPERNYEAR +
LEAPS_THRU_END_OF(newy - 1) -
LEAPS_THRU_END_OF(y - 1);
y = newy;
}
tmp->tm_year = y - TM_YEAR_BASE;
idays = (int) days; /* no longer have a range problem */
tmp->tm_yday = idays;
ip = mon_lengths[yleap];
for (i = 0; idays >= ip[i]; ++i)
idays -= ip[i];
tmp->tm_mon = i;
tmp->tm_mday = idays + 1;
tmp->tm_sec = (int) (rem % SECSPERMIN) + hit;
ip = mon_lengths[isleap(y)];
for (tmp->tm_mon = 0; idays >= ip[tmp->tm_mon]; ++(tmp->tm_mon))
idays -= ip[tmp->tm_mon];
tmp->tm_mday = (int) (idays + 1);
tmp->tm_isdst = 0;
tmp->tm_gmtoff = offset;
return tmp;
}
/*
* Simplified normalize logic courtesy Paul Eggert.
*/
static int
increment_overflow(int *number, int delta)
{
int number0;
number0 = *number;
*number += delta;
return (*number < number0) != (delta < 0);
}
/*
@ -1027,6 +1321,48 @@ pg_next_dst_boundary(const pg_time_t *timep,
*before_isdst = ttisp->tt_isdst;
return 0;
}
if ((sp->goback && t < sp->ats[0]) ||
(sp->goahead && t > sp->ats[sp->timecnt - 1]))
{
/* For values outside the transition table, extrapolate */
pg_time_t newt = t;
pg_time_t seconds;
pg_time_t tcycles;
int64 icycles;
int result;
if (t < sp->ats[0])
seconds = sp->ats[0] - t;
else seconds = t - sp->ats[sp->timecnt - 1];
--seconds;
tcycles = seconds / YEARSPERREPEAT / AVGSECSPERYEAR;
++tcycles;
icycles = tcycles;
if (tcycles - icycles >= 1 || icycles - tcycles >= 1)
return -1;
seconds = icycles;
seconds *= YEARSPERREPEAT;
seconds *= AVGSECSPERYEAR;
if (t < sp->ats[0])
newt += seconds;
else newt -= seconds;
if (newt < sp->ats[0] ||
newt > sp->ats[sp->timecnt - 1])
return -1; /* "cannot happen" */
result = pg_next_dst_boundary(&newt, before_gmtoff,
before_isdst,
boundary,
after_gmtoff,
after_isdst,
tz);
if (t < sp->ats[0])
*boundary -= seconds;
else
*boundary += seconds;
return result;
}
if (t > sp->ats[sp->timecnt - 1])
{
/* No known transition >= t, so use last known segment's type */
@ -1058,9 +1394,20 @@ pg_next_dst_boundary(const pg_time_t *timep,
return 1;
}
/* Else search to find the containing segment */
for (i = 1; i < sp->timecnt; ++i)
if (t <= sp->ats[i])
break;
{
int lo = 1;
int hi = sp->timecnt;
while (lo < hi)
{
int mid = (lo + hi) >> 1;
if (t < sp->ats[mid])
hi = mid;
else lo = mid + 1;
}
i = lo;
}
j = sp->types[i - 1];
ttisp = &sp->ttis[j];
*before_gmtoff = ttisp->tt_gmtoff;

9
src/timezone/pgtz.c
Unescape View File

@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/timezone/pgtz.c,v 1.58 2008/02/11 19:55:11 mha Exp $
* $PostgreSQL: pgsql/src/timezone/pgtz.c,v 1.59 2008/02/16 21:16:04 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -287,7 +287,7 @@ score_timezone(const char *tzname, struct tztry * tt)
* Load timezone directly. Don't use pg_tzset, because we don't want all
* timezones loaded in the cache at startup.
*/
if (tzload(tzname, NULL, &tz.state) != 0)
if (tzload(tzname, NULL, &tz.state, TRUE) != 0)
{
if (tzname[0] == ':' || tzparse(tzname, &tz.state, FALSE) != 0)
{
@ -1191,7 +1191,7 @@ pg_tzset(const char *name)
return &tzp->tz;
}
if (tzload(uppername, canonname, &tzstate) != 0)
if (tzload(uppername, canonname, &tzstate, TRUE) != 0)
{
if (uppername[0] == ':' || tzparse(uppername, &tzstate, FALSE) != 0)
{
@ -1463,7 +1463,8 @@ pg_tzenumerate_next(pg_tzenum *dir)
* Load this timezone using tzload() not pg_tzset(), so we don't fill
* the cache
*/
if (tzload(fullname + dir->baselen, dir->tz.TZname, &dir->tz.state) != 0)
if (tzload(fullname + dir->baselen, dir->tz.TZname, &dir->tz.state,
TRUE) != 0)
{
/* Zone could not be loaded, ignore it */
continue;

7
src/timezone/pgtz.h
Unescape View File

@ -9,7 +9,7 @@
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/timezone/pgtz.h,v 1.21 2008/01/01 19:46:01 momjian Exp $
* $PostgreSQL: pgsql/src/timezone/pgtz.h,v 1.22 2008/02/16 21:16:04 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -43,6 +43,8 @@ struct state
int timecnt;
int typecnt;
int charcnt;
int goback;
int goahead;
pg_time_t ats[TZ_MAX_TIMES];
unsigned char types[TZ_MAX_TIMES];
struct ttinfo ttis[TZ_MAX_TYPES];
@ -64,7 +66,8 @@ struct pg_tz
extern int pg_open_tzfile(const char *name, char *canonname);
/* in localtime.c */
extern int tzload(const char *name, char *canonname, struct state * sp);
extern int tzload(const char *name, char *canonname, struct state * sp,
int doextend);
extern int tzparse(const char *name, struct state * sp, int lastditch);
#endif /* _PGTZ_H */

54
src/timezone/private.h
Unescape View File

@ -3,10 +3,10 @@
/*
* This file is in the public domain, so clarified as of
* 1996-06-05 by Arthur David Olson (arthur_david_olson@nih.gov).
* 1996-06-05 by Arthur David Olson.
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/timezone/private.h,v 1.11 2005/02/23 04:34:21 momjian Exp $
* $PostgreSQL: pgsql/src/timezone/private.h,v 1.12 2008/02/16 21:16:04 tgl Exp $
*/
/*
@ -17,12 +17,13 @@
* Thank you!
*/
#include <limits.h> /* for CHAR_BIT */
#include <limits.h> /* for CHAR_BIT et al. */
#include <sys/wait.h> /* for WIFEXITED and WEXITSTATUS */
#include <unistd.h> /* for F_OK and R_OK */
#include "pgtime.h"
#define GRANDPARENTED "Local time zone must be set--see zic manual page"
#ifndef WIFEXITED
#define WIFEXITED(status) (((status) & 0xff) == 0)
@ -34,22 +35,6 @@
/* Unlike <ctype.h>'s isdigit, this also works if c < 0 | c > UCHAR_MAX. */
#define is_digit(c) ((unsigned)(c) - '0' <= 9)
/*
* SunOS 4.1.1 headers lack EXIT_SUCCESS.
*/
#ifndef EXIT_SUCCESS
#define EXIT_SUCCESS 0
#endif /* !defined EXIT_SUCCESS */
/*
* SunOS 4.1.1 headers lack EXIT_FAILURE.
*/
#ifndef EXIT_FAILURE
#define EXIT_FAILURE 1
#endif /* !defined EXIT_FAILURE */
/*
* SunOS 4.1.1 libraries lack remove.
*/
@ -70,7 +55,7 @@ extern char *imalloc(int n);
extern void *irealloc(void *pointer, int size);
extern void icfree(char *pointer);
extern void ifree(char *pointer);
extern char *scheck(const char *string, const char *format);
extern const char *scheck(const char *string, const char *format);
/*
@ -93,6 +78,15 @@ extern char *scheck(const char *string, const char *format);
#define TYPE_SIGNED(type) (((type) -1) < 0)
#endif /* !defined TYPE_SIGNED */
/*
* Since the definition of TYPE_INTEGRAL contains floating point numbers,
* it cannot be used in preprocessor directives.
*/
#ifndef TYPE_INTEGRAL
#define TYPE_INTEGRAL(type) (((type) 0.5) != 0.5)
#endif /* !defined TYPE_INTEGRAL */
#ifndef INT_STRLEN_MAXIMUM
/*
* 302 / 1000 is log10(2.0) rounded up.
@ -107,6 +101,26 @@ extern char *scheck(const char *string, const char *format);
#undef _
#define _(msgid) (msgid)
#ifndef YEARSPERREPEAT
#define YEARSPERREPEAT 400 /* years before a Gregorian repeat */
#endif /* !defined YEARSPERREPEAT */
/*
** The Gregorian year averages 365.2425 days, which is 31556952 seconds.
*/
#ifndef AVGSECSPERYEAR
#define AVGSECSPERYEAR 31556952L
#endif /* !defined AVGSECSPERYEAR */
#ifndef SECSPERREPEAT
#define SECSPERREPEAT ((int64) YEARSPERREPEAT * (int64) AVGSECSPERYEAR)
#endif /* !defined SECSPERREPEAT */
#ifndef SECSPERREPEAT_BITS
#define SECSPERREPEAT_BITS 34 /* ceil(log2(SECSPERREPEAT)) */
#endif /* !defined SECSPERREPEAT_BITS */
/*
* UNIX was a registered trademark of The Open Group in 2003.
*/

11
src/timezone/scheck.c
Unescape View File

@ -1,9 +1,9 @@
/*
* This file is in the public domain, so clarified as of
* 1996-06-05 by Arthur David Olson (arthur_david_olson@nih.gov).
* 2006-07-17 by Arthur David Olson.
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/timezone/scheck.c,v 1.8 2007/10/26 13:30:10 tgl Exp $
* $PostgreSQL: pgsql/src/timezone/scheck.c,v 1.9 2008/02/16 21:16:04 tgl Exp $
*/
#include "postgres_fe.h"
@ -11,18 +11,17 @@
#include "private.h"
char *
const char *
scheck(const char *string, const char *format)
{
char *fbuf;
const char *fp;
char *tp;
int c;
char *result;
const char *result;
char dummy;
static char nada;
result = &nada;
result = "";
if (string == NULL || format == NULL)
return result;
fbuf = imalloc((int) (2 * strlen(format) + 4));

79
src/timezone/strftime.c
Unescape View File

@ -7,7 +7,7 @@
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley. The name of the
* by the University of California, Berkeley. The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
@ -15,7 +15,7 @@
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/timezone/strftime.c,v 1.11 2006/07/14 14:52:27 momjian Exp $
* $PostgreSQL: pgsql/src/timezone/strftime.c,v 1.12 2008/02/16 21:16:04 tgl Exp $
*/
#include "postgres.h"
@ -92,6 +92,7 @@ static char *_add(const char *, char *, const char *);
static char *_conv(int, const char *, char *, const char *);
static char *_fmt(const char *, const struct pg_tm *, char *,
const char *, int *);
static char * _yconv(int, int, int, int, char *, const char *);
#define IN_NONE 0
#define IN_SOME 1
@ -160,8 +161,8 @@ _fmt(const char *format, const struct pg_tm * t, char *pt, const char *ptlim,
* ...whereas now POSIX 1003.2 calls for something
* completely different. (ado, 1993-05-24)
*/
pt = _conv((t->tm_year + TM_YEAR_BASE) / 100,
"%02d", pt, ptlim);
pt = _yconv(t->tm_year, TM_YEAR_BASE, 1, 0,
pt, ptlim);
continue;
case 'c':
{
@ -213,7 +214,7 @@ _fmt(const char *format, const struct pg_tm * t, char *pt, const char *ptlim,
* This used to be... _conv(t->tm_hour % 12 ? t->tm_hour
* % 12 : 12, 2, ' '); ...and has been changed to the
* below to match SunOS 4.1.1 and Arnold Robbins' strftime
* version 3.0. That is, "%k" and "%l" have been swapped.
* version 3.0. That is, "%k" and "%l" have been swapped.
* (ado, 1993-05-24)
*/
pt = _conv(t->tm_hour, "%2d", pt, ptlim);
@ -289,7 +290,7 @@ _fmt(const char *format, const struct pg_tm * t, char *pt, const char *ptlim,
case 'G': /* ISO 8601 year (four digits) */
case 'g': /* ISO 8601 year (two digits) */
/*
* From Arnold Robbins' strftime version 3.0: "the week number of the
* From Arnold Robbins' strftime version 3.0: "the week number of the
* year (the first Monday as the first day of week 1) as a decimal number
* (01-53)."
* (ado, 1993-05-24)
@ -302,17 +303,19 @@ _fmt(const char *format, const struct pg_tm * t, char *pt, const char *ptlim,
* might also contain days from the previous year and the week before week
* 01 of a year is the last week (52 or 53) of the previous year even if
* it contains days from the new year. A week starts with Monday (day 1)
* and ends with Sunday (day 7). For example, the first week of the year
* and ends with Sunday (day 7). For example, the first week of the year
* 1997 lasts from 1996-12-30 to 1997-01-05..."
* (ado, 1996-01-02)
*/
{
int year;
int base;
int yday;
int wday;
int w;
year = t->tm_year + TM_YEAR_BASE;
year = t->tm_year;
base = TM_YEAR_BASE;
yday = t->tm_yday;
wday = t->tm_wday;
for (;;)
@ -321,7 +324,7 @@ _fmt(const char *format, const struct pg_tm * t, char *pt, const char *ptlim,
int bot;
int top;
len = isleap(year) ?
len = isleap_sum(year, base) ?
DAYSPERLYEAR :
DAYSPERNYEAR;
@ -342,7 +345,7 @@ _fmt(const char *format, const struct pg_tm * t, char *pt, const char *ptlim,
top += len;
if (yday >= top)
{
++year;
++base;
w = 1;
break;
}
@ -352,8 +355,8 @@ _fmt(const char *format, const struct pg_tm * t, char *pt, const char *ptlim,
DAYSPERWEEK);
break;
}
--year;
yday += isleap(year) ?
--base;
yday += isleap_sum(year, base) ?
DAYSPERLYEAR :
DAYSPERNYEAR;
}
@ -363,11 +366,11 @@ _fmt(const char *format, const struct pg_tm * t, char *pt, const char *ptlim,
else if (*format == 'g')
{
*warnp = IN_ALL;
pt = _conv(year % 100, "%02d",
pt = _yconv(year, base, 0, 1,
pt, ptlim);
}
else
pt = _conv(year, "%04d",
pt = _yconv(year, base, 1, 1,
pt, ptlim);
}
continue;
@ -405,12 +408,12 @@ _fmt(const char *format, const struct pg_tm * t, char *pt, const char *ptlim,
continue;
case 'y':
*warnp = IN_ALL;
pt = _conv((t->tm_year + TM_YEAR_BASE) % 100,
"%02d", pt, ptlim);
pt = _yconv(t->tm_year, TM_YEAR_BASE, 0, 1,
pt, ptlim);
continue;
case 'Y':
pt = _conv(t->tm_year + TM_YEAR_BASE, "%04d",
pt, ptlim);
pt = _yconv(t->tm_year, TM_YEAR_BASE, 1, 1,
pt, ptlim);
continue;
case 'Z':
if (t->tm_zone != NULL)
@ -480,3 +483,43 @@ _add(const char *str, char *pt, const char *ptlim)
++pt;
return pt;
}
/*
* POSIX and the C Standard are unclear or inconsistent about
* what %C and %y do if the year is negative or exceeds 9999.
* Use the convention that %C concatenated with %y yields the
* same output as %Y, and that %Y contains at least 4 bytes,
* with more only if necessary.
*/
static char *
_yconv(const int a, const int b, const int convert_top,
const int convert_yy, char *pt, const char * const ptlim)
{
int lead;
int trail;
#define DIVISOR 100
trail = a % DIVISOR + b % DIVISOR;
lead = a / DIVISOR + b / DIVISOR + trail / DIVISOR;
trail %= DIVISOR;
if (trail < 0 && lead > 0)
{
trail += DIVISOR;
--lead;
}
else if (lead < 0 && trail > 0)
{
trail -= DIVISOR;
++lead;
}
if (convert_top)
{
if (lead == 0 && trail < 0)
pt = _add("-0", pt, ptlim);
else pt = _conv(lead, "%02d", pt, ptlim);
}
if (convert_yy)
pt = _conv(((trail < 0) ? -trail : trail), "%02d", pt, ptlim);
return pt;
}

40
src/timezone/tzfile.h
Unescape View File

@ -3,10 +3,10 @@
/*
* This file is in the public domain, so clarified as of
* 1996-06-05 by Arthur David Olson (arthur_david_olson@nih.gov).
* 1996-06-05 by Arthur David Olson.
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/timezone/tzfile.h,v 1.6 2005/10/15 02:49:51 momjian Exp $
* $PostgreSQL: pgsql/src/timezone/tzfile.h,v 1.7 2008/02/16 21:16:04 tgl Exp $
*/
/*
@ -33,7 +33,8 @@
struct tzhead
{
char tzh_magic[4]; /* TZ_MAGIC */
char tzh_reserved[16]; /* reserved for future use */
char tzh_version[1]; /* '\0' or '2' as of 2005 */
char tzh_reserved[15]; /* reserved--must be zero */
char tzh_ttisgmtcnt[4]; /* coded number of trans. time flags */
char tzh_ttisstdcnt[4]; /* coded number of trans. time flags */
char tzh_leapcnt[4]; /* coded number of leap seconds */
@ -69,17 +70,21 @@ struct tzhead
*/
/*
* In the current implementation, "tzset()" refuses to deal with files that
* exceed any of the limits below.
* If tzh_version is '2' or greater, the above is followed by a second instance
* of tzhead and a second instance of the data in which each coded transition
* time uses 8 rather than 4 chars,
* then a POSIX-TZ-environment-variable-style string for use in handling
* instants after the last transition time stored in the file
* (with nothing between the newlines if there is no POSIX representation for
* such instants).
*/
/*
* The TZ_MAX_TIMES value below is enough to handle a bit more than a
* year's worth of solar time (corrected daily to the nearest second) or
* 138 years of Pacific Presidential Election time
* (where there are three time zone transitions every fourth year).
* In the current implementation, "tzset()" refuses to deal with files that
* exceed any of the limits below.
*/
#define TZ_MAX_TIMES 370
#define TZ_MAX_TIMES 1200
#define TZ_MAX_TYPES 256 /* Limited by what (unsigned char)'s can hold */
@ -124,11 +129,20 @@ struct tzhead
#define EPOCH_YEAR 1970
#define EPOCH_WDAY TM_THURSDAY
#define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
/*
* Accurate only for the past couple of centuries;
* that will probably do.
* Since everything in isleap is modulo 400 (or a factor of 400), we know that
* isleap(y) == isleap(y % 400)
* and so
* isleap(a + b) == isleap((a + b) % 400)
* or
* isleap(a + b) == isleap(a % 400 + b % 400)
* This is true even if % means modulo rather than Fortran remainder
* (which is allowed by C89 but not C99).
* We use this to avoid addition overflow problems.
*/
#define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
#define isleap_sum(a, b) isleap((a) % 400 + (b) % 400)
#endif /* !defined TZFILE_H */

932
src/timezone/zic.c
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