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/*
* datetime_functions.c --
*
* This file defines new functions for the time and date data types.
*
* Copyright (C) 1999, Massimo Dal Zotto <dz@cs.unitn.it>
*
* Date2mjd code contributed by Reiner Dassing <dassing@wettzell.ifag.de>
*
* This software is distributed under the GNU General Public License
* either version 2, or (at your option) any later version.
*/
#include <stdio.h>
#include <string.h>
#include <limits.h>
#ifdef HAVE_FLOAT_H
#include <float.h>
#endif
#include "postgres.h"
#include "miscadmin.h"
#include "utils/builtins.h"
#include "utils/nabstime.h"
#include "utils/datetime.h"
#include "access/xact.h"
#include "datetime_functions.h"
/* Constant to replace calls to date2j(2000,1,1) */
#define JDATE_2000 2451545
/*
* decode_24h_time()
*
* Decode time string 00:00:00 through 24:00:00.
*/
static int
decode_24h_time(char *str, struct tm * tm, double *fsec)
{
char *cp;
tm->tm_hour = strtol(str, &cp, 10);
if (*cp != ':')
return -1;
str = cp + 1;
tm->tm_min = strtol(str, &cp, 10);
if (*cp == '\0')
{
tm->tm_sec = 0;
*fsec = 0;
}
else if (*cp != ':')
return -1;
else
{
str = cp + 1;
tm->tm_sec = strtol(str, &cp, 10);
if (*cp == '\0')
*fsec = 0;
else if (*cp == '.')
{
str = cp;
*fsec = strtod(str, &cp);
if (cp == str)
return -1;
}
else
return -1;
}
/* do a sanity check */
if ((tm->tm_hour < 0) || (tm->tm_hour > 24)
|| (tm->tm_min < 0) || (tm->tm_min > 59)
|| (tm->tm_sec < 0) || (tm->tm_sec > 59)
|| (*fsec < 0))
return -1;
return 0;
}
/*
* A modified version of time_in which allows the value 24:00:00 for
* time and converts it to TimeADT data type forcing seconds to 0.
* This can be useful if you need to handle TimeADT values limited
* to hh:mm like in timetables.
*/
TimeADT *
hhmm_in(char *str)
{
TimeADT *time;
double fsec;
struct tm tt,
*tm = &tt;
if (!PointerIsValid(str))
elog(ERROR, "Bad (null) time external representation", NULL);
if (decode_24h_time(str, tm, &fsec) != 0)
elog(ERROR, "Bad time external representation '%s'", str);
if ((tm->tm_hour < 0) || (tm->tm_hour > 24)
|| ((tm->tm_hour == 24)
&& ((tm->tm_min != 0) || (tm->tm_sec != 0) || (fsec != 0.0))))
{
elog(ERROR,
"Time must be limited to values 00:00:00 through 24:00:00 "
"in \"%s\"",
str);
}
time = palloc(sizeof(TimeADT));
*time = ((((tm->tm_hour * 60) + tm->tm_min) * 60));
return (time);
}
/*
* A modified version of time_out which converts from TimeADT data type
* omitting the seconds field when it is 0.
* Useful if you need to handle TimeADT values limited to hh:mm.
*/
char *
hhmm_out(TimeADT *time)
{
char *result;
struct tm tt,
*tm = &tt;
char buf[MAXDATELEN + 1];
if (!PointerIsValid(time))
return NULL;
tm->tm_hour = (*time / (60 * 60));
tm->tm_min = (((int) (*time / 60)) % 60);
tm->tm_sec = (((int) *time) % 60);
if (tm->tm_sec == 0)
sprintf(buf, "%02d:%02d", tm->tm_hour, tm->tm_min);
else
sprintf(buf, "%02d:%02d:%02d", tm->tm_hour, tm->tm_min, tm->tm_sec);
result = palloc(strlen(buf) + 1);
strcpy(result, buf);
return (result);
}
TimeADT *
hhmm(TimeADT *time)
{
TimeADT *result = palloc(sizeof(TimeADT));
*result = (((int) *time) / 60 * 60);
return (result);
}
TimeADT *
time_difference(TimeADT *time1, TimeADT *time2)
{
TimeADT *time = palloc(sizeof(TimeADT));
*time = (*time1 - *time2);
return (time);
}
int4
time_hours(TimeADT *time)
{
return (((int) *time) / 3600);
}
int4
time_minutes(TimeADT *time)
{
return ((((int) *time) / 60) % 60);
}
int4
time_seconds(TimeADT *time)
{
return (((int) *time) % 60);
}
int4
as_minutes(TimeADT *time)
{
return (((int) *time) / 60);
}
int4
as_seconds(TimeADT *time)
{
return ((int) *time);
}
int4
date_day(DateADT val)
{
int year,
month,
day;
j2date(val + JDATE_2000, &year, &month, &day);
return (day);
}
int4
date_month(DateADT val)
{
int year,
month,
day;
j2date(val + JDATE_2000, &year, &month, &day);
return (month);
}
int4
date_year(DateADT val)
{
int year,
month,
day;
j2date(val + JDATE_2000, &year, &month, &day);
return (year);
}
TimeADT *
currenttime()
{
TimeADT *result = palloc(sizeof(TimeADT));
struct tm *tm;
time_t current_time;
current_time = time(NULL);
tm = localtime(¤t_time);
*result = ((((tm->tm_hour * 60) + tm->tm_min) * 60) + tm->tm_sec);
return (result);
}
DateADT
currentdate()
{
DateADT date;
struct tm tt,
*tm = &tt;
GetCurrentTime(tm);
date = (date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) - JDATE_2000);
return (date);
}
int4
date2mjd(DateADT val)
{
int result;
result = val + JDATE_2000 - 2400000.5;
return result;
}
/* end of file */
/*
* Local Variables:
* tab-width: 4
* c-indent-level: 4
* c-basic-offset: 4
* End:
*/
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