isc/win32/time.c

	time.c revision 0fc87fa2f38df7b293b650deacfa5e6c3d50eff9

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

#include <windows.h>

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

isc_result
isc_time_get(isc_time_t t) {
    /*
     * Set *timep to the current absolute time (secs + nsec since
     * January 1, 1970).
     */

    REQUIRE(t != NULL);

    /* XXX No nanoseconds! */
    t->seconds = (unsigned long)time(NULL);
    t->nanoseconds = 0;
    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);

    if (t1->seconds < t2->seconds)
        return (-1);
    if (t1->seconds > t2->seconds)
        return (1);
    if (t1->nanoseconds < t2->nanoseconds)
        return (-1);
    if (t1->nanoseconds > t2->nanoseconds)
        return (1);
    return (0);
}

void
isc_time_add(isc_time_t t1, isc_time_t t2, isc_time_t t3)
{
    /*
     * Add 't1' to 't2', storing the result in 't3'.
     */

    REQUIRE(t1 != NULL && t2 != NULL && t3 != NULL);

    t3->seconds = t1->seconds + t2->seconds;
    t3->nanoseconds = t1->nanoseconds + t2->nanoseconds;
    if (t3->nanoseconds > 1000000000) {
        t3->seconds++;
        t3->nanoseconds -= 1000000000;
    }
}

void
isc_time_subtract(isc_time_t t1, isc_time_t t2, isc_time_t t3) {
    /*
     * Subtract 't2' from 't1', storing the result in 't1'.
     */

    REQUIRE(t1 != NULL && t2 != NULL && t3 != NULL);
    REQUIRE(isc_time_compare(t1, t2) >= 0);

    t3->seconds = t1->seconds - t2->seconds;
    if (t1->nanoseconds >= t2->nanoseconds)
        t3->nanoseconds = t1->nanoseconds - t2->nanoseconds;
    else {
        t3->nanoseconds = 1000000000 - t2->nanoseconds +
            t1->nanoseconds;
        t3->seconds--;
    }
}