Ryan Mulder
146 lines
4.4 KiB
C
146 lines
4.4 KiB
C
/**
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* @file
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* @author Steve Karg
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* @date 2009
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* @brief System time library header file.
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*
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* @section DESCRIPTION
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*
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* This library provides functions for getting and setting the system time.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <time.h>
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#include "bacnet/basic/sys/debug.h"
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#include "bacport.h"
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#include "bacnet/datetime.h"
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static int32_t Time_Offset; /* Time offset in ms */
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/**
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* @brief Calculate the time offset from the system clock.
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* @return Time offset in ms
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*/
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static int32_t time_difference(struct timeval t0, struct timeval t1)
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{
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return (t0.tv_sec - t1.tv_sec) * 1000 + (t0.tv_usec - t1.tv_usec) / 1000;
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}
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/**
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* @brief Set offset from the system clock.
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* @param bdate BACnet Date structure to hold local time
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* @param btime BACnet Time structure to hold local time
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* @param utc - True for UTC sync, False for Local time
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* @return True if time is set
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*/
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void datetime_timesync(BACNET_DATE *bdate, BACNET_TIME *btime, bool utc)
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{
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struct timeval tv_inp, tv_sys;
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struct tm *timeinfo;
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time_t rawtime;
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time(&rawtime);
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timeinfo = localtime(&rawtime);
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/* fixme: only set the time if off by some amount */
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timeinfo->tm_year = bdate->year - 1900;
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timeinfo->tm_mon = bdate->month - 1;
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timeinfo->tm_mday = bdate->day;
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timeinfo->tm_hour = btime->hour;
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timeinfo->tm_min = btime->min;
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timeinfo->tm_sec = btime->sec;
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tv_inp.tv_sec = mktime(timeinfo);
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tv_inp.tv_usec = btime->hundredths * 10000;
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if (gettimeofday(&tv_sys, NULL) == 0) {
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if (utc) {
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Time_Offset = time_difference(tv_inp, tv_sys) -
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(timezone - timeinfo->tm_isdst * 3600) * 1000;
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} else {
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Time_Offset = time_difference(tv_inp, tv_sys);
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}
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#if PRINT_ENABLED
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debug_printf("Time offset = %d\n", Time_Offset);
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#endif
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}
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return;
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}
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/**
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* @brief Get the date, time, timezone, and UTC offset from system
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* @param utc_time - the BACnet Date and Time structure to hold UTC time
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* @param local_time - the BACnet Date and Time structure to hold local time
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* @param utc_offset_minutes - number of minutes offset from UTC
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* For example, -6*60 represents 6.00 hours behind UTC/GMT
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* @param true if DST is enabled and active
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* @return true if local time was retrieved
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*/
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bool datetime_local(
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BACNET_DATE *bdate,
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BACNET_TIME *btime,
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int16_t *utc_offset_minutes,
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bool *dst_active)
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{
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bool status = false;
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struct tm *tblock = NULL;
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struct timeval tv;
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int32_t to;
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if (gettimeofday(&tv, NULL) == 0) {
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to = Time_Offset;
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tv.tv_sec += (int)to / 1000;
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tv.tv_usec += (to % 1000) * 1000;
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tblock = (struct tm *)localtime((const time_t *)&tv.tv_sec);
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}
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if (tblock) {
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status = true;
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/** struct tm
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* int tm_sec Seconds [0,60].
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* int tm_min Minutes [0,59].
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* int tm_hour Hour [0,23].
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* int tm_mday Day of month [1,31].
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* int tm_mon Month of year [0,11].
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* int tm_year Years since 1900.
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* int tm_wday Day of week [0,6] (Sunday =0).
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* int tm_yday Day of year [0,365].
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* int tm_isdst Daylight Savings flag.
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*/
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datetime_set_date(
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bdate, (uint16_t)tblock->tm_year + 1900,
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(uint8_t)tblock->tm_mon + 1, (uint8_t)tblock->tm_mday);
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datetime_set_time(
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btime, (uint8_t)tblock->tm_hour, (uint8_t)tblock->tm_min,
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(uint8_t)tblock->tm_sec, (uint8_t)(tv.tv_usec / 10000));
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if (dst_active) {
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/* The value of tm_isdst is:
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- positive if Daylight Saving Time is in effect,
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- 0 if Daylight Saving Time is not in effect, and
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- negative if the information is not available. */
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if (tblock->tm_isdst > 0) {
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*dst_active = true;
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} else {
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*dst_active = false;
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}
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}
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/* note: timezone is declared in <time.h> stdlib. */
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if (utc_offset_minutes) {
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/* timezone is set to the difference, in seconds,
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between Coordinated Universal Time (UTC) and
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local standard time */
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*utc_offset_minutes = timezone / 60;
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}
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}
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return status;
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}
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/**
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* initialize the date time
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*/
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void datetime_init(void)
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{
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/* nothing to do */
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}
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