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(svn r7384) -Fix: No vehicle was removed in DeleteVehicleNews when the fifo-array was full. Update the 

bound conditions of the loop, add an assert and also update _current_news when needed. (r3757)
release/0.5
Darkvater 2006-12-05 22:35:25 +00:00
parent 0a0368014d
commit a9ea304121
1 changed files with 26 additions and 4 deletions
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30
news_gui.c
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@ -29,6 +29,12 @@
* [O------------F-------------C---------L ]
* |
* forced
*
* Of course by using an array we can have situations like
*
* [----L O-----F---------C-----------------]
* This is where we have wrapped around the array and have
* (MAX_NEWS - O) + L news items
*/
#define MAX_NEWS 30
@ -870,7 +876,7 @@ void DeleteVehicleNews(VehicleID vid, StringID news)
{
NewsID n;
for (n = _oldest_news; _latest_news != INVALID_NEWS && n != increaseIndex(_latest_news); n = increaseIndex(n)) {
for (n = _oldest_news; _latest_news != INVALID_NEWS; n = increaseIndex(n)) {
const NewsItem *ni = &_news_items[n];
if (ni->flags & NF_VEHICLE &&
@ -879,18 +885,32 @@ void DeleteVehicleNews(VehicleID vid, StringID news)
Window *w;
if (_forced_news == n || _current_news == n) MoveToNextItem();
_total_news--;
// If this is the last news item, invalidate _latest_news
if (_latest_news == _oldest_news) _latest_news = INVALID_NEWS;
if (_latest_news == _oldest_news) {
assert(_total_news == 0);
_latest_news = INVALID_NEWS;
}
if (n != _oldest_news) {
/* Since we only imitate a FIFO removing an arbitrary element does need
* some magic. Remove the item by shifting head towards the tail. eg
* oldest remove last
* | | |
* [------O--------n-----L--]
* will become (change dramatized to make clear)
* [---------O-----------L--]
* Also update the current news item in case it was pointing to the
* oldest, now shifted item */
if (_total_news != 0) {
NewsID i;
for (i = n; i != _oldest_news; i = decreaseIndex(i)) {
_news_items[i] = _news_items[decreaseIndex(i)];
}
if (_current_news == _oldest_news) _current_news = increaseIndex(_current_news);
_oldest_news = increaseIndex(_oldest_news);
}
_total_news--;
w = FindWindowById(WC_MESSAGE_HISTORY, 0);
if (w != NULL) {
@ -898,5 +918,7 @@ void DeleteVehicleNews(VehicleID vid, StringID news)
w->vscroll.count = _total_news;
}
}
if (n == _latest_news) break;
}
}