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Add handy functions for timeval manipulations. Obtained from FreeBSD.

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This commit is contained in:
Gleb Smirnoff
2017-12-27 14:24:27 -08:00
committed by Justin Maggard
parent 63f725f8c9
commit 04e243c85c
2 changed files with 48 additions and 0 deletions
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40
utils.c
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@ -531,3 +531,43 @@ valid_media_types(const char *path)
return ALL_MEDIA;
}
/*
* Add and subtract routines for timevals.
* N.B.: subtract routine doesn't deal with
* results which are before the beginning,
* it just gets very confused in this case.
* Caveat emptor.
*/
static void timevalfix(struct timeval *);
void
timevaladd(struct timeval *t1, const struct timeval *t2)
{
t1->tv_sec += t2->tv_sec;
t1->tv_usec += t2->tv_usec;
timevalfix(t1);
}
void
timevalsub(struct timeval *t1, const struct timeval *t2)
{
t1->tv_sec -= t2->tv_sec;
t1->tv_usec -= t2->tv_usec;
timevalfix(t1);
}
static void
timevalfix(struct timeval *t1)
{
if (t1->tv_usec < 0) {
t1->tv_sec--;
t1->tv_usec += 1000000;
}
if (t1->tv_usec >= 1000000) {
t1->tv_sec++;
t1->tv_usec -= 1000000;
}
}