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(svn r7388) -Fix (r7384 / r7368 / r3757): When adding a new news item for the first time (_latest_news

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is INVALID_NEWS), make it the value of _oldest_news, not zero as DeleteVehicleNews can
 change _oldest_news. Also remove the (i == INVALID_NEWS) return 0; guard from increaseIndex
 as it's only used in 2 places, nowhere else.
This commit is contained in:
Darkvater 2006-12-05 23:37:04 +00:00
parent 0e10e86137
commit f2a70e3e26
1 changed files with 6 additions and 4 deletions
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10
news_gui.c
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@ -230,7 +230,7 @@ static void NewsWindowProc(Window *w, WindowEvent *e)
* queue and deals with overflows when increasing the index */
static inline NewsID increaseIndex(NewsID i)
{
if (i == INVALID_NEWS) return 0;
assert(i != INVALID_NEWS);
return (i + 1) % MAX_NEWS;
}
@ -275,9 +275,11 @@ void AddNewsItem(StringID string, uint32 flags, uint data_a, uint data_b)
_forced_news = INVALID_NEWS;
if (_total_news < MAX_NEWS) _total_news++;
// make sure our pointer isn't overflowing
/* Increase _latest_news. If we have no news yet, use _oldest news as an
* index. We cannot use 0 as _oldest_news can jump around due to
* DeleteVehicleNews */
l_news = _latest_news;
_latest_news = increaseIndex(_latest_news);
_latest_news = (_latest_news == INVALID_NEWS) ? _oldest_news : increaseIndex(_latest_news);
/* If the fifo-buffer is full, overwrite the oldest entry */
if (l_news != INVALID_NEWS && _latest_news == _oldest_news) {
@ -489,7 +491,7 @@ static void MoveToNextItem(void)
if (_current_news != _latest_news) {
NewsItem *ni;
_current_news = increaseIndex(_current_news);
_current_news = (_current_news == INVALID_NEWS) ? _oldest_news : increaseIndex(_current_news);
ni = &_news_items[_current_news];
// check the date, don't show too old items