/**
* time_add_month_with_zone:
* @time: A time_t value.
* @months: Number of months to add.
* @zone: Timezone to use.
*
* Adds or subtracts a number of months to/from the given time_t value, using
* the given timezone.
*
* If the day would be off the end of the month (e.g. adding 1 month to
* 30th January, would lead to an invalid day, 30th February), it moves it
* down to the last day in the month, e.g. 28th Feb (or 29th in a leap year.)
*
* NOTE: this function is only here to make the transition to the timezone
* functions easier. New code should use icaltimetype values and
* icaltime_adjust() to add or subtract days, hours, minutes & seconds.
*
* Return value: a time_t value containing @time plus the months added.
*/
time_t
time_add_month_with_zone (time_t time, int months, icaltimezone *zone)
{
struct icaltimetype tt;
int day, days_in_month;
/* Convert to an icaltimetype. */
tt = icaltime_from_timet_with_zone (time, FALSE, zone);
/* Add on the number of months. */
tt.month += months;
/* Save the day, and set it to 1, so we don't overflow into the next
month. */
day = tt.day;
tt.day = 1;
/* Normalize it, fixing any month overflow. */
tt = icaltime_normalize (tt);
/* If we go past the end of a month, set it to the last day. */
days_in_month = time_days_in_month (tt.year, tt.month - 1);
if (day > days_in_month)
day = days_in_month;
tt.day = day;
/* Convert back to a time_t. */
return icaltime_as_timet_with_zone (tt, zone);
}
time_t
time_add_month (time_t time, int months)
{
struct tm *tm = localtime (&time);
time_t new_time;
int mday;
mday = tm->tm_mday;
tm->tm_mon += months;
tm->tm_isdst = -1;
if ((new_time = mktime (tm)) == -1){
g_warning ("mktime could not handling adding a month with\n");
print_time_t (time);
return time;
}
tm = localtime (&new_time);
if (tm->tm_mday < mday){
tm->tm_mon--;
tm->tm_mday = time_days_in_month (tm->tm_year+1900, tm->tm_mon);
return new_time = mktime (tm);
}
else
return new_time;
}
static gboolean
calculate_day_month_for_coord (GcalYearView *year_view,
gdouble x,
gdouble y,
gint *out_day,
gint *out_month)
{
GcalYearViewPrivate *priv = year_view->priv;
gint row, column, i, sw, box_side, clicked_cell, day, month;
row = -1;
column = -1;
box_side = priv->navigator_grid->box_side;
sw = 1 - 2 * priv->k;
/* y selection */
for (i = 0; i < 4 && ((row == -1) || (column == -1)); i++)
{
if (row == -1 &&
y > priv->navigator_grid->coordinates[i * 4].y + box_side &&
y < priv->navigator_grid->coordinates[i * 4].y + box_side * 7)
{
row = i;
}
if (column == -1 &&
x > priv->navigator_grid->coordinates[i].x + box_side * 0.5 &&
x < priv->navigator_grid->coordinates[i].x + box_side * 7.5)
{
column = i;
}
}
if (row == -1 || column == -1)
return FALSE;
month = row * 4 + column;
row = (y - (priv->navigator_grid->coordinates[month].y + box_side)) / box_side;
column = (x - (priv->navigator_grid->coordinates[month].x + box_side * 0.5)) / box_side;
clicked_cell = row * 7 + column;
day = 7 * ((clicked_cell + 7 * priv->k) / 7) + sw * (clicked_cell % 7) + (1 - priv->k);
day -= ((time_day_of_week (1, month, priv->date->year) - priv->first_weekday + 7) % 7);
if (day < 1 || day > time_days_in_month (priv->date->year, month))
return FALSE;
*out_day = day;
*out_month = month;
return TRUE;
}