bind/lib/isc/win32/time.c

/*
 * Copyright (C) 1998, 1999, 2000  Internet Software Consortium.
 * 
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 * SOFTWARE.
 */

#include <config.h>

#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <errno.h>

#include <windows.h>

#include <isc/assertions.h>
#include <isc/time.h>

/*
 * struct FILETIME uses "100-nanoseconds intevals".
 * NS / S = 1000000000 (10^9).
 * While it is reasonably obvious that this makes the needed
 * conversion factor 10^7, it is coded this way for additional clarity.
 */
#define NS_PER_S 	1000000000
#define NS_INTERVAL	100
#define INTERVALS_PER_S (NS_PER_S / NS_INTERVAL)

/***
 *** Intervals
 ***/

static isc_interval_t zero_interval = { 0 };
isc_interval_t *isc_interval_zero = &zero_interval;

void
isc_interval_set(isc_interval_t *i,
		 unsigned int seconds, unsigned int nanoseconds) {

	/*
	 * Set 'i' to a value representing an interval of 'seconds' seconds
	 * and 'nanoseconds' nanoseconds, suitable for use in isc_time_add()
	 * and isc_time_subtract().
	 */

	REQUIRE(i != NULL);
	REQUIRE(nanoseconds < 1000000000);

	i->interval = (LONGLONG)seconds * INTERVALS_PER_S
		+ nanoseconds / NS_INTERVAL;
}

isc_boolean_t
isc_interval_iszero(isc_interval_t *i) {

	/*
	 * Returns ISC_TRUE iff. 'i' is the zero interval.
	 */

	REQUIRE(i != NULL);
	if (i->interval == 0)
		return (ISC_TRUE);

	return (ISC_FALSE);
}


/***
 *** Absolute Times
 ***/

static isc_time_t epoch = { 0, 0 };
isc_time_t *isc_time_epoch = &epoch;

void
isc_time_settoepoch(isc_time_t *t) {
	/*
	 * Set 't' to the time of the epoch.
	 */

	REQUIRE(t != NULL);

	t->absolute.dwLowDateTime = 0;
	t->absolute.dwHighDateTime = 0;
}

isc_boolean_t
isc_time_isepoch(isc_time_t *t) {
	/*
	 * Returns ISC_TRUE iff. 't' is the epoch ("time zero").
	 */

	REQUIRE(t != NULL);

	if (t->absolute.dwLowDateTime == 0 &&
	    t->absolute.dwHighDateTime == 0)
		return (ISC_TRUE);

	return (ISC_FALSE);
}

isc_result_t
isc_time_now(isc_time_t *t) {
	/*
	 * Set *t to the current absolute time.
	 */
	
	REQUIRE(t != NULL);

	GetSystemTimeAsFileTime(&t->absolute);

	return (ISC_R_SUCCESS);
}

isc_result_t
isc_time_nowplusinterval(isc_time_t *t, isc_interval_t *i) {
	ULARGE_INTEGER i1;

	/*
	 * Set *t to the current absolute time + i.
	 */
	
	REQUIRE(t != NULL);
	REQUIRE(i != NULL);
	
	GetSystemTimeAsFileTime(&t->absolute);

	i1.LowPart = t->absolute.dwLowDateTime;
	i1.HighPart = t->absolute.dwHighDateTime;

	i1.QuadPart += i->interval;

	t->absolute.dwLowDateTime  = i1.LowPart;
	t->absolute.dwHighDateTime = i1.HighPart;

	return (ISC_R_SUCCESS);
}

int
isc_time_compare(isc_time_t *t1, isc_time_t *t2) {
	/*
	 * Compare the times referenced by 't1' and 't2'
	 */

	REQUIRE(t1 != NULL && t2 != NULL);

	return ((int)CompareFileTime(&t1->absolute, &t2->absolute));
}

void
isc_time_add(isc_time_t *t, isc_interval_t *i, isc_time_t *result)
{
	ULARGE_INTEGER i1, i2;

	/*
	 * Add 't' to 'i', storing the result in 'result'.
	 */

	REQUIRE(t != NULL && i != NULL && result != NULL);

	i1.LowPart = t->absolute.dwLowDateTime;
	i1.HighPart = t->absolute.dwHighDateTime;

	i2.QuadPart = i1.QuadPart + i->interval;
	
	result->absolute.dwLowDateTime = i2.LowPart;
	result->absolute.dwHighDateTime = i2.HighPart;
}

void
isc_time_subtract(isc_time_t *t, isc_interval_t *i, isc_time_t *result) {
	ULARGE_INTEGER i1, i2;

	/*
	 * Subtract 'i' from 't', storing the result in 'result'.
	 */

	REQUIRE(t != NULL && i != NULL && result != NULL);

	i1.LowPart = t->absolute.dwLowDateTime;
	i1.HighPart = t->absolute.dwHighDateTime;

	i2.QuadPart = i1.QuadPart - i->interval;
	
	result->absolute.dwLowDateTime = i2.LowPart;
	result->absolute.dwHighDateTime = i2.HighPart;
}

isc_uint64_t
isc_time_microdiff(isc_time_t *t1, isc_time_t *t2) {
	ULARGE_INTEGER i1, i2;
	LONGLONG i3;

	REQUIRE(t1 != NULL && t2 != NULL);

	i1.LowPart  = t1->absolute.dwLowDateTime;
	i1.HighPart = t1->absolute.dwHighDateTime;
	i2.LowPart  = t2->absolute.dwLowDateTime;
	i2.HighPart = t2->absolute.dwHighDateTime;

	if (i1.QuadPart <= i2.QuadPart)
		return (0);

	/*
	 * Convert to microseconds.
	 */
	i3 = (i1.QuadPart - i2.QuadPart) / 10;

	return (i3);
}

isc_uint32_t
isc_time_seconds(isc_time_t *t) {
	ULARGE_INTEGER i;

	i.LowPart = t->absolute.dwLowDateTime;
	i.HighPart = t->absolute.dwHighDateTime;

	INSIST(i.QuadPart / INTERVALS_PER_S <= (isc_uint32_t)-1);

	return ((isc_uint32_t)(i.QuadPart / INTERVALS_PER_S));
}

isc_uint32_t
isc_time_nanoseconds(isc_time_t *t) {
	ULARGE_INTEGER i;

	i.LowPart = t->absolute.dwLowDateTime;
	i.HighPart = t->absolute.dwHighDateTime;

	i.QuadPart -= isc_time_seconds(t);

	ENSURE(i.QuadPart * NS_INTERVAL < NS);

	return ((isc_uint32_t)(i.QuadPart * NS_INTERVAL));
}