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#include "taia.h"
#include <sys/time.h>
#include <sys/types.h>
/**
@file taia.c
@author djb
@ref qmail
@brief 'tai' attosecond time handling
*/
/* XXX: breaks tai encapsulation */
void taia_add(struct taia *t, struct taia *u, struct taia *v)
{
t->sec.x = u->sec.x + v->sec.x;
t->nano = u->nano + v->nano;
t->atto = u->atto + v->atto;
if (t->atto > 999999999UL) {
t->atto -= 1000000000UL;
++t->nano;
}
if (t->nano > 999999999UL) {
t->nano -= 1000000000UL;
++t->sec.x;
}
}
double taia_approx(struct taia *t)
{
return tai_approx(&t->sec) + taia_frac(t);
}
double taia_frac(struct taia *t)
{
return (t->atto * 0.000000001 + t->nano) * 0.000000001;
}
int taia_less(struct taia *t, struct taia *u)
{
if (t->sec.x < u->sec.x) return 1;
if (t->sec.x > u->sec.x) return 0;
if (t->nano < u->nano) return 1;
if (t->nano > u->nano) return 0;
return t->atto < u->atto;
}
int taia_now(struct taia *t)
{
struct timeval now;
if (gettimeofday(&now, (struct timezone *)0) == 0) {
tai_unix(&t->sec, now.tv_sec);
t->nano = 1000 * now.tv_usec + 500;
t->atto = 0;
return 0;
}
t->nano = 0;
t->atto = 0;
return -1;
}
void taia_pack(char *s, struct taia *t)
{
unsigned long x;
tai_pack(s, &t->sec);
s += 8;
x = t->atto;
s[7] = x & 255;
x >>= 8;
s[6] = x & 255;
x >>= 8;
s[5] = x & 255;
x >>= 8;
s[4] = x;
x = t->nano;
s[3] = x & 255;
x >>= 8;
s[2] = x & 255;
x >>= 8;
s[1] = x & 255;
x >>= 8;
s[0] = x;
}
void taia_sub(struct taia *t, struct taia *u, struct taia *v)
{
unsigned long unano = u->nano;
unsigned long uatto = u->atto;
t->sec.x = u->sec.x - v->sec.x;
t->nano = unano - v->nano;
t->atto = uatto - v->atto;
if (t->atto > uatto) {
t->atto += 1000000000UL;
--t->nano;
}
if (t->nano > unano) {
t->nano += 1000000000UL;
--t->sec.x;
}
}
void taia_uint(struct taia *t, unsigned int s)
{
t->sec.x = s;
t->nano = 0;
t->atto = 0;
}
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