2005-08-03 20:37:28 +00:00
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/* nstime.c
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* Routines for manipulating nstime_t structures
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*
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* Copyright (c) 2005 MX Telecom Ltd. <richardv@mxtelecom.com>
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*
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* $Id$
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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*/
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2005-08-24 21:31:56 +00:00
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#include <glib.h>
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2005-08-03 20:37:28 +00:00
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#include "nstime.h"
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/* this is #defined so that we can clearly see that we have the right number of
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zeros, rather than as a guard against the number of nanoseconds in a second
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changing ;) */
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#define NS_PER_S 1000000000
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2005-08-24 21:31:56 +00:00
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/* set the given nstime_t to zero */
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void nstime_set_zero(nstime_t *nstime)
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{
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nstime->secs = 0;
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nstime->nsecs = 0;
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}
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/* is the given nstime_t currently zero? */
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gboolean nstime_is_zero(nstime_t *nstime)
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{
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if(nstime->secs == 0 && nstime->nsecs == 0) {
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return TRUE;
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} else {
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return FALSE;
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}
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}
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2005-08-03 20:37:28 +00:00
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/*
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2005-08-24 21:31:56 +00:00
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* function: nstime_delta
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2005-08-03 20:37:28 +00:00
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* delta = b - a
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*/
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2005-08-24 21:31:56 +00:00
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void nstime_delta(nstime_t *delta, const nstime_t *b, const nstime_t *a )
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2005-08-03 20:37:28 +00:00
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{
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if (b->secs == a->secs) {
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/* The seconds part of b is the same as the seconds part of a, so if
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the nanoseconds part of the first time is less than the nanoseconds
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part of a, b is before a. The nanoseconds part of the delta should
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just be the difference between the nanoseconds part of b and the
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nanoseconds part of a; don't adjust the seconds part of the delta,
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as it's OK if the nanoseconds part is negative, and an overflow
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can never result. */
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delta->secs = 0;
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delta->nsecs = b->nsecs - a->nsecs;
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} else if (b->secs <= a->secs) {
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/* The seconds part of b is less than the seconds part of a, so b is
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before a.
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Both the "seconds" and "nanoseconds" value of the delta
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should have the same sign, so if the difference between the
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nanoseconds values would be *positive*, subtract 1,000,000,000
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from it, and add one to the seconds value. */
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delta->secs = b->secs - a->secs;
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delta->nsecs = b->nsecs - a->nsecs;
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if(delta->nsecs > 0) {
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delta->nsecs -= NS_PER_S;
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delta->secs ++;
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}
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} else {
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delta->secs = b->secs - a->secs;
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delta->nsecs = b->nsecs - a->nsecs;
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if(delta->nsecs < 0) {
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delta->nsecs += NS_PER_S;
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delta->secs --;
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}
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}
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}
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/*
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2005-08-24 21:31:56 +00:00
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* function: nstime_sum
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2005-08-03 20:37:28 +00:00
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* sum = a + b
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*/
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2005-08-24 21:31:56 +00:00
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void nstime_sum(nstime_t *sum, const nstime_t *a, const nstime_t *b)
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2005-08-03 20:37:28 +00:00
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{
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sum->secs = a->secs + b->secs;
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sum->nsecs = a->nsecs + b->nsecs;
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if(sum->nsecs>=NS_PER_S || (sum->nsecs>0 && sum->secs<0)){
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sum->nsecs-=NS_PER_S;
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sum->secs++;
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} else if(sum->nsecs<=-NS_PER_S || (sum->nsecs<0 && sum->secs>0)) {
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sum->nsecs+=NS_PER_S;
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sum->secs--;
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}
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}
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2005-08-22 07:12:20 +00:00
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/*
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* function: nstime_to_msec
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* converts nstime to double, time base is milli seconds
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*/
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double nstime_to_msec(const nstime_t *time)
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{
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return ((double)time->secs*1000 + (double)time->nsecs/1000000);
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}
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2005-08-24 21:31:56 +00:00
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/*
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* function: nstime_to_sec
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* converts nstime to double, time base is seconds
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*/
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double nstime_to_sec(const nstime_t *time)
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{
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return ((double)time->secs + (double)time->nsecs/1000000000);
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}
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