bool calendar_spec_valid(CalendarSpec *c) {
assert(c);
if (c->weekdays_bits > 127)
return false;
if (!chain_valid(c->year, 1970, 2199))
return false;
if (!chain_valid(c->month, 1, 12))
return false;
if (!chain_valid(c->day, 1, 31))
return false;
if (!chain_valid(c->hour, 0, 23))
return false;
if (!chain_valid(c->minute, 0, 59))
return false;
if (!chain_valid(c->second, 0, 59))
return false;
return true;
}
_pure_ bool calendar_spec_valid(CalendarSpec *c) {
assert(c);
if (c->weekdays_bits > BITS_WEEKDAYS)
return false;
if (!chain_valid(c->year, MIN_YEAR, MAX_YEAR, false))
return false;
if (!chain_valid(c->month, 1, 12, false))
return false;
if (!chain_valid(c->day, 1, 31, c->end_of_month))
return false;
if (!chain_valid(c->hour, 0, 23, false))
return false;
if (!chain_valid(c->minute, 0, 59, false))
return false;
if (!chain_valid(c->microsecond, 0, 60*USEC_PER_SEC-1, false))
return false;
return true;
}
_pure_ bool calendar_spec_valid(CalendarSpec *c) {
assert(c);
if (c->weekdays_bits > BITS_WEEKDAYS)
return false;
if (!chain_valid(c->year, 1970, 2199))
return false;
if (!chain_valid(c->month, 1, 12))
return false;
if (!chain_valid(c->day, 1, 31))
return false;
if (!chain_valid(c->hour, 0, 23))
return false;
if (!chain_valid(c->minute, 0, 59))
return false;
if (!chain_valid(c->microsecond, 0, 60*USEC_PER_SEC-1))
return false;
return true;
}
static bool chain_valid(CalendarComponent *c, int from, int to) {
if (!c)
return true;
if (c->value < from || c->value > to)
return false;
if (c->value + c->repeat > to)
return false;
if (c->next)
return chain_valid(c->next, from, to);
return true;
}
_pure_ static bool chain_valid(CalendarComponent *c, int from, int to, bool end_of_month) {
assert(to >= from);
if (!c)
return true;
/* Forbid dates more than 28 days from the end of the month */
if (end_of_month)
to -= 3;
if (c->start < from || c->start > to)
return false;
/* Avoid overly large values that could cause overflow */
if (c->repeat > to - from)
return false;
/*
* c->repeat must be short enough so at least one repetition may
* occur before the end of the interval. For dates scheduled
* relative to the end of the month, c->start and c->stop
* correspond to the Nth last day of the month.
*/
if (c->stop >= 0) {
if (c->stop < from || c ->stop > to)
return false;
if (c->start + c->repeat > c->stop)
return false;
} else {
if (end_of_month && c->start - c->repeat < from)
return false;
if (!end_of_month && c->start + c->repeat > to)
return false;
}
if (c->next)
return chain_valid(c->next, from, to, end_of_month);
return true;
}
