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#include <sys/time.h>
#include "monoclock.h"
#include "tvmath.h"
/**
* tvmath_addctime(tv):
* Set tv += monoclock.
*/
int
tvmath_addctime(struct timeval * tv)
{
struct timeval tnow;
if (monoclock_get(&tnow))
goto err0;
tv->tv_sec += tnow.tv_sec;
tv->tv_usec += tnow.tv_usec;
if (tv->tv_usec >= 1000000) {
tv->tv_usec -= 1000000;
tv->tv_sec += 1;
}
/* Success! */
return (0);
err0:
/* Failure! */
return (-1);
}
/**
* tvmath_subctime(tv):
* Set tv -= monoclock.
*/
int
tvmath_subctime(struct timeval * tv)
{
struct timeval tnow;
if (monoclock_get(&tnow))
goto err0;
tv->tv_sec -= tnow.tv_sec;
tv->tv_usec -= tnow.tv_usec;
if (tv->tv_usec < 0) {
tv->tv_usec += 1000000;
tv->tv_sec -= 1;
}
/* Success! */
return (0);
err0:
/* Failure! */
return (-1);
}
/**
* tvmath_rsubctime(tv):
* Set tv = monoclock - tv.
*/
int
tvmath_rsubctime(struct timeval * tv)
{
struct timeval tnow;
if (monoclock_get(&tnow))
goto err0;
tv->tv_sec = tnow.tv_sec - tv->tv_sec;
tv->tv_usec = tnow.tv_usec - tv->tv_usec;
if (tv->tv_usec < 0) {
tv->tv_usec += 1000000;
tv->tv_sec -= 1;
}
/* Success! */
return (0);
err0:
/* Failure! */
return (-1);
}
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