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/*
* $Id$
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <assert.h>
#include <time.h>
#include <errno.h>
#include <rtems/system.h>
#include <rtems/score/isr.h>
#include <rtems/score/thread.h>
#include <rtems/score/tod.h>
#include <rtems/seterr.h>
#include <rtems/posix/time.h>
/*PAGE
*
* _POSIX_Timespec_subtract
*/
void _POSIX_Timespec_subtract(
const struct timespec *the_start,
const struct timespec *end,
struct timespec *result
)
{
struct timespec start_struct = *the_start;
struct timespec *start = &start_struct;
unsigned int nsecs_per_sec = TOD_NANOSECONDS_PER_SECOND;
if (end->tv_nsec < start->tv_nsec) {
int seconds = (start->tv_nsec - end->tv_nsec) / nsecs_per_sec + 1;
start->tv_nsec -= nsecs_per_sec * seconds;
start->tv_sec += seconds;
}
if (end->tv_nsec - start->tv_nsec > nsecs_per_sec) {
int seconds = (start->tv_nsec - end->tv_nsec) / nsecs_per_sec;
start->tv_nsec += nsecs_per_sec * seconds;
start->tv_sec -= seconds;
}
result->tv_sec = end->tv_sec - start->tv_sec;
result->tv_nsec = end->tv_nsec - start->tv_nsec;
}
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