Steve Karg
112 lines
3.3 KiB
C
112 lines
3.3 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 <stdbool.h>
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#include <stdint.h>
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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 <sys/time.h>
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/* BACnet Stack defines - first */
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#include "bacnet/bacdef.h"
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/* BACnet Stack API */
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#include "bacnet/datetime.h"
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/* HACK:
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* - Zephyr does not declare timezone in any header file.
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* - The gcc-arm-none-eabi-7-2018-q2-update/bin/arm-none-eabi/lib/thumb/v7e-m/
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* libc_nano.a 'time' symbol does not resolve '_gettimeofday'
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*
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* TODO: figure out how to link in the real time() and timezone;
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*/
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long timezone;
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time_t time(time_t *tloc)
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{
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time_t time = { 0 };
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return time;
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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_st = { 0 };
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struct tm *tblock = &tblock_st;
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struct timeval tv;
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if (gettimeofday(&tv, NULL) == 0)
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{
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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(bdate, (uint16_t)tblock->tm_year + 1900,
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(uint8_t)tblock->tm_mon + 1,
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(uint8_t)tblock->tm_mday);
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datetime_set_time(btime, (uint8_t)tblock->tm_hour,
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(uint8_t)tblock->tm_min, (uint8_t)tblock->tm_sec,
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(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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