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Date: Thu, 05 Dec 2013 08:58:50 +0000
From: Laurent Bercot <>
Subject: Re: [PATCHv2] Add support for leap seconds in zoneinfo files

> i assume
> 	hit=leapsecs_sub(&t);
> 	if(hit) t++;
> 	leapsecs_add(&t,hit);

  This is true if and only if all leap seconds are 1, which is the case for now
and in the foreseeable future, but my version supports even the improbable
case where different corrections are introduced.
  But you are right, it is possible to go backwards too:

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) break ;
	if (i) 	{
		*t += corr;
		if (hit && (t == trans)) {
			int oldcorr = 0;
			if (i > 1)
				__leapsecs_read(i-2, &trans, &oldcorr);
			*t += oldcorr - corr;


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