diff options
Diffstat (limited to 'news_gui.c')
| -rw-r--r-- | news_gui.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/news_gui.c b/news_gui.c index f6a10748c..05804d9c8 100644 --- a/news_gui.c +++ b/news_gui.c @@ -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 |