postgresql/contrib/datetime/datetime_functions.c
1996-08-18 22:14:33 +00:00

148 lines
2.3 KiB
C

/*
* datetime_functions.c --
*
* This file defines new functions for the time and date data types.
*
* Copyright (c) 1996, Massimo Dal Zotto <dz@cs.unitn.it>
*/
#include <time.h>
#include "postgres.h"
#include "pg_type.h"
#include "utils/palloc.h"
typedef struct DateADT {
char day;
char month;
short year;
} DateADT;
typedef struct TimeADT {
short hr;
short min;
float sec;
} TimeADT;
TimeADT *
time_difference(TimeADT *time1, TimeADT *time2)
{
TimeADT *time = (TimeADT*)palloc(sizeof(TimeADT));
time->sec = time1->sec - time2->sec;
time->min = time1->min - time2->min;
time->hr = time1->hr - time2->hr;
if (time->sec < 0) {
time->sec += 60.0;
time->min--;
} else if (time->sec >= 60.0) {
time->sec -= 60.0;
time->min++;
}
if (time->min < 0) {
time->min += 60;
time->hr--;
} else if (time->min >= 60) {
time->min -= 60;
time->hr++;
}
if (time->hr < 0) {
time->hr += 24;
} else if (time->hr >= 24) {
time->hr -= 24;
}
return (time);
}
TimeADT *
currentTime()
{
time_t current_time;
struct tm *tm;
TimeADT *result = (TimeADT*)palloc(sizeof(TimeADT));
current_time = time(NULL);
tm = localtime(&current_time);
result->sec = tm->tm_sec;
result->min = tm->tm_min;
result->hr = tm->tm_hour;
return (result);
}
int4
currentDate()
{
time_t current_time;
struct tm *tm;
int4 result;
DateADT *date = (DateADT*)&result;
current_time = time(NULL);
tm = localtime(&current_time);
date->day = tm->tm_mday;
date->month = tm->tm_mon+1;
date->year = tm->tm_year+1900;
return (result);
}
int4
hours(TimeADT *time)
{
return (time->hr);
}
int4
minutes(TimeADT *time)
{
return (time->min);
}
int4
seconds(TimeADT *time)
{
int seconds = (int)time->sec;
return (seconds);
}
int4
day(int4 val)
{
DateADT *date = (DateADT*)&val;
return (date->day);
}
int4
month(int4 val)
{
DateADT *date = (DateADT*)&val;
return (date->month);
}
int4
year(int4 val)
{
DateADT *date = (DateADT*)&val;
return (date->year);
}
int4
asMinutes(TimeADT *time)
{
int seconds = (int)time->sec;
return (time->min + 60*time->hr);
}
int4
asSeconds(TimeADT *time)
{
int seconds = (int)time->sec;
return (seconds + 60*time->min + 3600*time->hr);
}