8935ac4cc3
Gregory Nutt has submitted the SGA and we can mograte the licenses to Apache. Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>
86 lines
2.6 KiB
C
86 lines
2.6 KiB
C
/****************************************************************************
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* sched/clock/clock_timespec_subtract.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <time.h>
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#include "clock/clock.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: clock_timespec_subtract
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*
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* Description:
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* Subtract timespec ts2 from to1 and return the result in ts3.
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* Zero is returned if the time difference is negative.
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*
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* Input Parameters:
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* ts1 and ts2: The two timespecs to be subtracted (ts1 - ts2)
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* ts3: The location to return the result (may be ts1 or ts2)
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void clock_timespec_subtract(FAR const struct timespec *ts1,
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FAR const struct timespec *ts2,
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FAR struct timespec *ts3)
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{
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time_t sec;
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long nsec;
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if (ts1->tv_sec < ts2->tv_sec)
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{
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sec = 0;
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nsec = 0;
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}
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else if (ts1->tv_sec == ts2->tv_sec && ts1->tv_nsec <= ts2->tv_nsec)
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{
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sec = 0;
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nsec = 0;
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}
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else
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{
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sec = ts1->tv_sec - ts2->tv_sec;
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if (ts1->tv_nsec < ts2->tv_nsec)
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{
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nsec = (ts1->tv_nsec + NSEC_PER_SEC) - ts2->tv_nsec;
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sec--;
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}
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else
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{
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nsec = ts1->tv_nsec - ts2->tv_nsec;
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}
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}
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ts3->tv_sec = sec;
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ts3->tv_nsec = nsec;
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}
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