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