Steve Karg
7e725ce028
* Changed win32 port of localtime to use secure OS API functions when compiled with MSVC * Changed all the sprintf to use snprintf instead in BSC tests to ensure null string endings.
205 lines
6.2 KiB
C
205 lines
6.2 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 "bacport.h"
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#include "bacnet/datetime.h"
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/* Offset between Windows epoch 1/1/1601 and
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Unix epoch 1/1/1970 in 100 nanosec units */
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#if defined(_MSC_VER) || defined(_MSC_EXTENSIONS) || defined(__BORLANDC__)
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#define DELTA_EPOCH_IN_MICROSECS 11644473600000000Ui64
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#else
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#define DELTA_EPOCH_IN_MICROSECS 11644473600000000ULL
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#endif
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#if defined(__BORLANDC__) || defined(_WIN32)
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/* seems to not be defined in time.h as specified by The Open Group */
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/* difference from UTC and local standard time */
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long int timezone;
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#endif
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#if defined(_MSC_VER) || defined(__BORLANDC__)
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struct timezone {
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int tz_minuteswest; /* minutes W of Greenwich */
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int tz_dsttime; /* type of dst correction */
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};
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/*************************************************************************
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* Description: simulate the gettimeofday Linux function
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* Returns: zero
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* Note: The resolution of GetSystemTimeAsFileTime() is 15625 microseconds.
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* The resolution of _ftime() is about 16 milliseconds.
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* To get microseconds accuracy we need to use QueryPerformanceCounter or
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* timeGetTime for the elapsed time.
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*************************************************************************/
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int gettimeofday(struct timeval *tp, void *tzp)
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{
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static int tzflag = 0;
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struct timezone *tz;
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long tz_seconds = 0;
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int tz_hours = 0;
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/* start calendar time in microseconds */
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static LONGLONG usec_timer = 0;
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LONGLONG usec_elapsed = 0;
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/* elapsed time in milliseconds */
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static uint32_t time_start = 0;
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/* semi-accurate time from File Timer */
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FILETIME ft;
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uint32_t elapsed_milliseconds = 0;
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tzp = tzp;
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if (usec_timer == 0) {
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/* a 64-bit value representing the number of
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100-nanosecond intervals since January 1, 1601 (UTC). */
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GetSystemTimeAsFileTime(&ft);
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usec_timer = ft.dwHighDateTime;
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usec_timer <<= 32;
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usec_timer |= ft.dwLowDateTime;
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/*converting file time to unix epoch 1970 */
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usec_timer /= 10; /*convert into microseconds */
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usec_timer -= DELTA_EPOCH_IN_MICROSECS;
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tp->tv_sec = (long)(usec_timer / 1000000UL);
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tp->tv_usec = (long)(usec_timer % 1000000UL);
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time_start = timeGetTime();
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} else {
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elapsed_milliseconds = timeGetTime() - time_start;
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usec_elapsed = usec_timer + ((LONGLONG)elapsed_milliseconds * 1000UL);
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tp->tv_sec = (long)(usec_elapsed / 1000000UL);
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tp->tv_usec = (long)(usec_elapsed % 1000000UL);
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}
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if (tzp) {
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if (!tzflag) {
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_tzset();
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tzflag++;
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}
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tz = tzp;
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(void)_get_timezone(&tz_seconds);
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tz->tz_minuteswest = tz_seconds / 60;
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(void)_get_daylight(&tz_hours);
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tz->tz_dsttime = tz_hours;
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}
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return 0;
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}
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#endif
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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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(void)bdate;
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(void)btime;
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(void)utc;
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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;
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#if defined(_MSC_VER)
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struct tm newtime = { 0 };
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__time64_t long_time = 0;
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#else
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struct timeval tv;
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#endif
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#if defined(_MSC_VER)
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_time64(&long_time);
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(void)localtime_s(&newtime, &long_time);
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tblock = &newtime;
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#else
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if (gettimeofday(&tv, NULL) == 0) {
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tblock = (struct tm *)localtime((const time_t *)&tv.tv_sec);
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}
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#endif
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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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#if !defined(_MSC_VER)
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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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#else
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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, 0);
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#endif
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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 = (int16_t)(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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