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Date: Thu, 5 Dec 2013 06:18:09 +0100
From: Szabolcs Nagy <nsz@...t70.net>
To: musl@...ts.openwall.com
Subject: Re: [PATCHv2] Add support for leap seconds in zoneinfo files
* Laurent Bercot <ska-dietlibc@...rnet.org> [2013-12-05 01:13:30 +0000]:
>
> +static int leapsecs_sub(long long *t)
> +{
> + long long trans;
> + int corr;
> + unsigned int i = __leapsecs_num;
> + int hit = 0;
> + for (; i; i--) {
> + __leapsecs_read(i-1, &trans, &corr);
> + if (*t >= trans) break;
> + }
> + if (i) {
> + if (*t == trans) hit = 1;
> + *t -= corr;
> + }
> + return hit;
> +}
>
> +static void leapsecs_add(long long *t, int hit)
> +{
> + int oldcorr = 0;
> + unsigned int i = 0;
> + for (; i < __leapsecs_num; i++) {
> + long long trans;
> + int newcorr;
> + __leapsecs_read(i, &trans, &newcorr);
> + if (*t < trans) break;
> + if (!hit || (*t > trans)) {
> + *t += newcorr - oldcorr;
> + }
> + oldcorr = newcorr;
> + }
> +}
> +
i assume
hit=leapsecs_sub(&t);
if(hit) t++;
leapsecs_add(&t,hit);
should give back the original t,
then the add part can go backwards on the leapsec list instead of forward:
static void leapsecs_add(long long *t, int hit)
{
long long trans;
int corr;
unsigned int i = __leapsecs_num;
for (; i; i--) {
__leapsecs_read(i-1, &trans, &corr);
if (*t+corr > trans) {
*t += corr;
// only consider hit at a leapsecond
if (hit && *t == trans+1) *t--;
break;
}
}
}
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