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

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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
This commit is contained in:
Tom Lane
2008-02-16 21:16:04 +00:00
parent 2f67722dda
commit 0171e72d4d
12 changed files with 1347 additions and 440 deletions
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79
src/timezone/strftime.c
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@ -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;
}