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/*
* Ouroboros - Copyright (C) 2016 - 2018
*
* Time utilities
*
* Dimitri Staessens <dimitri.staessens@ugent.be>
* Sander Vrijders <sander.vrijders@ugent.be>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* version 2.1 as published by the Free Software Foundation.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., http://www.fsf.org/about/contact/.
*/
#define _POSIX_C_SOURCE 199309L
#include <ouroboros/time_utils.h>
#include <stddef.h>
/* functions for timespecs */
/* add intv to t and store it in res*/
int ts_add(const struct timespec * t,
const struct timespec * intv,
struct timespec * res)
{
time_t nanos = 0;
if (t == NULL || intv == NULL || res == NULL)
return -1;
nanos = t->tv_nsec + intv->tv_nsec;
res->tv_sec = t->tv_sec + intv->tv_sec;
while (nanos >= BILLION) {
nanos -= BILLION;
++(res->tv_sec);
}
res->tv_nsec = nanos;
return 0;
}
/* subtract intv from t and stores it in res */
int ts_diff(const struct timespec * t,
const struct timespec * intv,
struct timespec * res)
{
time_t nanos = 0;
if (t == NULL || intv == NULL || res == NULL)
return -1;
nanos = t->tv_nsec - intv->tv_nsec;
res->tv_sec = t->tv_sec - intv->tv_sec;
while (nanos < 0) {
nanos += BILLION;
--(res->tv_sec);
}
res->tv_nsec = nanos;
return 0;
}
/* functions for timevals */
/* add intv to t and store it in res*/
int tv_add(const struct timeval * t,
const struct timeval * intv,
struct timeval * res)
{
time_t micros = 0;
if (t == NULL || intv == NULL || res == NULL)
return -1;
micros = t->tv_usec + intv->tv_usec;
res->tv_sec = t->tv_sec + intv->tv_sec;
while (micros >= MILLION) {
micros -= MILLION;
++(res->tv_sec);
}
res->tv_usec = micros;
return 0;
}
/* subtract intv from t and stores it in res */
int tv_diff(const struct timeval * t,
const struct timeval * intv,
struct timeval * res)
{
time_t micros = 0;
if (t == NULL || intv == NULL || res == NULL)
return -1;
micros = t->tv_usec - intv->tv_usec;
res->tv_sec = t->tv_sec - intv->tv_sec;
while (micros < 0) {
micros += MILLION;
--(res->tv_sec);
}
res->tv_usec = micros;
return 0;
}
int tv_to_ts(const struct timeval * src,
struct timespec * dst)
{
if (src == NULL || dst == NULL)
return -1;
dst->tv_sec = src->tv_sec;
dst->tv_nsec = src->tv_usec * 1000L;
return 0;
}
/* copying a timespec into a timeval (loss of resolution) */
int ts_to_tv(const struct timespec * src,
struct timeval * dst)
{
if (src == NULL || dst == NULL)
return -1;
dst->tv_sec = src->tv_sec;
dst->tv_usec = src->tv_nsec / 1000L;
return 0;
}
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