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From: Thomas Lockhart <Thomas.G.Lockhart@jpl.nasa.gov>

Browse Source 
Subject: [HACKERS] More date time functions

Here are some additional patches mostly related to the date and time
data types. It includes some type conversion routines to move between
the different date types and some other date manipulation routines such
as date_part(units,datetime).

I noticed Edmund Mergl et al's neat trick for getting function overloading
for builtin functions, so started to use that for the date and time stuff.
Later, if someone figures out how to get function overloading directly
for internal C code, then we can move to that technique.

These patches include documentation updates (don't faint!) for the built-in
man page. Doesn't yet include mention of timestamp, since I don't know
much about it and since it may change a bit to become a _real_ ANSI timestamp
which would include parser support for the declaration syntax (what do you
think, Dan?).

The patches were developed on the 970330 release, but have been rebuilt
off of the 970402 release. The first patch below is to get libpq to compile,
on my Linux box, but is not related to the rest of the patches and you can
choose not to apply that one at this time. Thanks in advance, scrappy!
This commit is contained in:
Marc G. Fournier
1997-04-02 18:36:24 +00:00
parent 920c58df71
commit 2ab34dfe1a
12 changed files with 997 additions and 340 deletions
Download Patch File Download Diff File Expand all files Collapse all files

99
src/backend/utils/adt/nabstime.c
View File

@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/adt/nabstime.c,v 1.21 1997/03/28 07:12:53 scrappy Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/adt/nabstime.c,v 1.22 1997/04/02 18:33:50 scrappy Exp $
*
*-------------------------------------------------------------------------
*/
@ -27,6 +27,7 @@
#ifndef USE_POSIX_TIME
#include <sys/timeb.h>
#endif
#include "utils/builtins.h"
#include "access/xact.h"
@ -90,11 +91,19 @@ printf( "GetCurrentAbsoluteTime- timezone is %s -> %d seconds from UTC\n",
void
GetCurrentTime(struct tm *tm)
{
time_t now;
abstime2tm( GetCurrentTransactionStartTime(), &CTimeZone, tm);
return;
} /* GetCurrentTime() */
void
abstime2tm(AbsoluteTime time, int *tzp, struct tm *tm)
{
struct tm *tt;
now = GetCurrentTransactionStartTime()-CTimeZone;
tt = gmtime( &now);
if (tzp != NULL) time -= *tzp;
tt = gmtime((time_t *) &time);
tm->tm_year = tt->tm_year+1900;
tm->tm_mon = tt->tm_mon+1;
@ -105,11 +114,13 @@ GetCurrentTime(struct tm *tm)
tm->tm_isdst = tt->tm_isdst;
return;
} /* GetCurrentTime() */
} /* abstime2tm() */
AbsoluteTime tm2abstime( struct tm *tm, int tz);
/* tm2abstime()
* Convert a tm structure to abstime.
* Note that tm has full year (not 1900-based) and 1-based month.
*/
AbsoluteTime
tm2abstime( struct tm *tm, int tz)
{
@ -122,13 +133,13 @@ tm2abstime( struct tm *tm, int tz)
|| tm->tm_hour < 0 || tm->tm_hour >= 24
|| tm->tm_min < 0 || tm->tm_min > 59
|| tm->tm_sec < 0 || tm->tm_sec > 59)
return INVALID_ABSTIME;
return(INVALID_ABSTIME);
day = (date2j( tm->tm_year, tm->tm_mon, tm->tm_mday) - date2j( 1970, 1, 1));
/* check for time out of range */
if ((day < MIN_DAYNUM) || (day > MAX_DAYNUM))
return INVALID_ABSTIME;
return(INVALID_ABSTIME);
/* convert to seconds */
sec = tm->tm_sec + tz + (tm->tm_min +(day*24 + tm->tm_hour)*60)*60;
@ -136,7 +147,7 @@ tm2abstime( struct tm *tm, int tz)
/* check for overflow */
if ((day == MAX_DAYNUM && sec < 0) ||
(day == MIN_DAYNUM && sec > 0))
return INVALID_ABSTIME;
return(INVALID_ABSTIME);
/* daylight correction */
if (tm->tm_isdst < 0) { /* unknown; find out */
@ -147,7 +158,7 @@ tm2abstime( struct tm *tm, int tz)
/* check for reserved values (e.g. "current" on edge of usual range */
if (!AbsoluteTimeIsReal(sec))
return INVALID_ABSTIME;
return(INVALID_ABSTIME);
return sec;
} /* tm2abstime() */
@ -369,6 +380,16 @@ AbsoluteTimeIsAfter(AbsoluteTime time1, AbsoluteTime time2)
}
/* abstime_finite()
*/
bool
abstime_finite(AbsoluteTime abstime)
{
return((abstime != INVALID_ABSTIME)
&& (abstime != NOSTART_ABSTIME) && (abstime != NOEND_ABSTIME));
} /* abstime_datetime() */
/*
* abstimeeq - returns 1, iff arguments are equal
* abstimene - returns 1, iff arguments are not equal
@ -381,7 +402,7 @@ bool
abstimeeq(AbsoluteTime t1, AbsoluteTime t2)
{
if (t1 == INVALID_ABSTIME || t2 == INVALID_ABSTIME)
return 0;
return(FALSE);
if (t1 == CURRENT_ABSTIME)
t1 = GetCurrentTransactionStartTime();
if (t2 == CURRENT_ABSTIME)
@ -394,7 +415,7 @@ bool
abstimene(AbsoluteTime t1, AbsoluteTime t2)
{
if (t1 == INVALID_ABSTIME || t2 == INVALID_ABSTIME)
return 0;
return(FALSE);
if (t1 == CURRENT_ABSTIME)
t1 = GetCurrentTransactionStartTime();
if (t2 == CURRENT_ABSTIME)
@ -407,7 +428,7 @@ bool
abstimelt(AbsoluteTime t1, AbsoluteTime t2)
{
if (t1 == INVALID_ABSTIME || t2 == INVALID_ABSTIME)
return 0;
return(FALSE);
if (t1 == CURRENT_ABSTIME)
t1 = GetCurrentTransactionStartTime();
if (t2 == CURRENT_ABSTIME)
@ -420,7 +441,7 @@ bool
abstimegt(AbsoluteTime t1, AbsoluteTime t2)
{
if (t1 == INVALID_ABSTIME || t2 == INVALID_ABSTIME)
return 0;
return(FALSE);
if (t1 == CURRENT_ABSTIME)
t1 = GetCurrentTransactionStartTime();
if (t2 == CURRENT_ABSTIME)
@ -433,7 +454,7 @@ bool
abstimele(AbsoluteTime t1, AbsoluteTime t2)
{
if (t1 == INVALID_ABSTIME || t2 == INVALID_ABSTIME)
return 0;
return(FALSE);
if (t1 == CURRENT_ABSTIME)
t1 = GetCurrentTransactionStartTime();
if (t2 == CURRENT_ABSTIME)
@ -446,7 +467,7 @@ bool
abstimege(AbsoluteTime t1, AbsoluteTime t2)
{
if (t1 == INVALID_ABSTIME || t2 == INVALID_ABSTIME)
return 0;
return(FALSE);
if (t1 == CURRENT_ABSTIME)
t1 = GetCurrentTransactionStartTime();
if (t2 == CURRENT_ABSTIME)
@ -455,6 +476,7 @@ abstimege(AbsoluteTime t1, AbsoluteTime t2)
return(t1 >= t2);
}
/* datetime_abstime()
* Convert datetime to abstime.
*/
@ -480,10 +502,10 @@ datetime_abstime(DateTime *datetime)
} else {
if (DATETIME_IS_RELATIVE(*datetime)) {
datetime2tm( SetDateTime(*datetime), tm, &fsec);
datetime2tm( SetDateTime(*datetime), &CTimeZone, tm, &fsec);
result = tm2abstime( tm, 0);
} else if (datetime2tm( *datetime, tm, &fsec) == 0) {
} else if (datetime2tm( *datetime, &CTimeZone, tm, &fsec) == 0) {
result = tm2abstime( tm, 0);
} else {
@ -493,3 +515,42 @@ datetime_abstime(DateTime *datetime)
return(result);
} /* datetime_abstime() */
/* abstime_datetime()
* Convert datetime to abstime.
*/
DateTime *
abstime_datetime(AbsoluteTime abstime)
{
DateTime *result;
if (!PointerIsValid(result = PALLOCTYPE(DateTime)))
elog(WARN,"Unable to allocate space to convert abstime to datetime",NULL);
switch (abstime) {
case INVALID_ABSTIME:
DATETIME_INVALID(*result);
break;
case NOSTART_ABSTIME:
DATETIME_NOBEGIN(*result);
break;
case NOEND_ABSTIME:
DATETIME_NOEND(*result);
break;
case EPOCH_ABSTIME:
DATETIME_EPOCH(*result);
break;
case CURRENT_ABSTIME:
DATETIME_CURRENT(*result);
break;
default:
*result = abstime + ((date2j( 1970, 1, 1) - date2j( 2000, 1, 1))*86400);
};
return(result);
} /* abstime_datetime() */