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Fix recurrence rule expansion with ordered weekday

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When the order of a weekday in BYDAY rule expansion (like -5SA or 5SU
for monthly or 55WE for yearly) exceeds the number of available weekdays
in the period (month or year), rule expansion with negative order could
result in a floating point exception. The reason: the modified frequency
might become zero.

Solution. Check order against number of available weekdays and terminate
expansion early whenever possible (also for positive orders).

Signed-off-by: Lars Henriksen <LarsHenriksen@get2net.dk>
Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>
This commit is contained in:
Lars Henriksen
2020-05-07 21:39:23 +02:00
committed by Lukas Fleischer
parent fabacecd16
commit bd238bfd7c
3 changed files with 58 additions and 21 deletions
Download Patch File Download Diff File Expand all files Collapse all files

65
src/recur.c
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@@ -1173,7 +1173,7 @@ static int expand_monthly(time_t start, long dur, struct rpt *rpt, llist_t *exc,
LLIST_FOREACH(&rpt->bywday, i) {
w = LLIST_GET_DATA(i);
int order, wday;
int order, wday, nbwd;
localtime_r(&start, &tm_start);
/*
@@ -1188,6 +1188,11 @@ static int expand_monthly(time_t start, long dur, struct rpt *rpt, llist_t *exc,
*/
order = *w / WEEKINDAYS;
wday = *w % WEEKINDAYS;
nbwd = wday_per_month(tm_day.tm_mon + 1,
tm_day.tm_year + 1900,
wday);
if (nbwd < order)
return 0;
r.freq = order;
tm_start.tm_mday = 1;
tm_start.tm_mon = tm_day.tm_mon;
@@ -1218,11 +1223,12 @@ static int expand_monthly(time_t start, long dur, struct rpt *rpt, llist_t *exc,
*/
order = -(*w) / WEEKINDAYS;
wday = -(*w) % WEEKINDAYS;
r.freq = wday_per_month(
tm_day.tm_mon + 1,
tm_day.tm_year + 1900,
wday
) - order + 1;
nbwd = wday_per_month(tm_day.tm_mon + 1,
tm_day.tm_year + 1900,
wday);
if (nbwd < order)
return 0;
r.freq = nbwd - order + 1;
tm_start.tm_mday = 1;
tm_start.tm_mon = tm_day.tm_mon;
tm_start.tm_year = tm_day.tm_year;
@@ -1259,7 +1265,7 @@ static int expand_yearly(time_t start, long dur, struct rpt *rpt, llist_t *exc,
{
struct tm tm_start, tm_day;
llist_item_t *i, *j;
int *m, *w, mday, wday, order;
int *m, *w, mday, wday, order, nbwd;
time_t nstart;
struct rpt r;
@@ -1312,6 +1318,19 @@ static int expand_yearly(time_t start, long dur, struct rpt *rpt, llist_t *exc,
*/
order = *w / WEEKINDAYS;
wday = *w % WEEKINDAYS;
if (rpt->bymonth.head)
nbwd = wday_per_month(
tm_day.tm_mon + 1,
tm_day.tm_year + 1900,
wday
);
else
nbwd = wday_per_year(
tm_day.tm_year + 1900,
wday
);
if (nbwd < order)
return 0;
r.freq = order;
tm_start.tm_mday = 1;
if (rpt->bymonth.head)
@@ -1344,21 +1363,25 @@ static int expand_yearly(time_t start, long dur, struct rpt *rpt, llist_t *exc,
*/
order = -(*w) / WEEKINDAYS;
wday = -(*w) % WEEKINDAYS;
if (rpt->bymonth.head) {
r.freq = wday_per_month(
tm_day.tm_mon + 1,
tm_day.tm_year + 1900,
wday
) - order + 1;
tm_start.tm_mon = tm_day.tm_mon;
} else {
r.freq = wday_per_year(
tm_day.tm_year + 1900,
wday
) - order + 1;
tm_start.tm_mon = 0;
}
if (rpt->bymonth.head)
nbwd = wday_per_month(
tm_day.tm_mon + 1,
tm_day.tm_year + 1900,
wday
);
else
nbwd = wday_per_year(
tm_day.tm_year + 1900,
wday
);
if (nbwd < order)
return 0;
r.freq = nbwd - order + 1;
tm_start.tm_mday = 1;
if (rpt->bymonth.head)
tm_start.tm_mon = tm_day.tm_mon;
else
tm_start.tm_mon = 0;
tm_start.tm_year = tm_day.tm_year;
tm_start.tm_isdst = -1;
nstart = date_sec_change(