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Make sure that MSG_PeekMessage uses an internal variable to avoid

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corruption.
This commit is contained in:
Andreas Mohr 2001-02-12 19:15:06 +00:00 committed by Alexandre Julliard
parent 8ee6cca354
commit cd5f28bd69
1 changed files with 30 additions and 24 deletions
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54
windows/message.c
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@ -1123,13 +1123,14 @@ static BOOL MSG_ConvertMsg( MSG *msg, int srcType, int dstType )
/***********************************************************************
* MSG_PeekMessage
*/
static BOOL MSG_PeekMessage( int type, LPMSG msg, HWND hwnd,
static BOOL MSG_PeekMessage( int type, LPMSG msg_out, HWND hwnd,
DWORD first, DWORD last, WORD flags, BOOL peek )
{
int changeBits, mask;
MESSAGEQUEUE *msgQueue;
HQUEUE16 hQueue;
int iWndsLocks;
MSG msg;
mask = QS_POSTMESSAGE | QS_SENDMESSAGE; /* Always selected */
if (first || last)
@ -1178,10 +1179,10 @@ static BOOL MSG_PeekMessage( int type, LPMSG msg, HWND hwnd,
(!first || WM_QUIT >= first) &&
(!last || WM_QUIT <= last) )
{
msg->hwnd = hwnd;
msg->message = WM_QUIT;
msg->wParam = msgQueue->wExitCode;
msg->lParam = 0;
msg.hwnd = hwnd;
msg.message = WM_QUIT;
msg.wParam = msgQueue->wExitCode;
msg.lParam = 0;
if (flags & PM_REMOVE) msgQueue->wPostQMsg = 0;
LeaveCriticalSection( &msgQueue->cSection );
break;
@ -1204,9 +1205,9 @@ static BOOL MSG_PeekMessage( int type, LPMSG msg, HWND hwnd,
goto retry;
}
*msg = tmpMsg;
msgQueue->GetMessageTimeVal = msg->time;
msgQueue->GetMessagePosVal = MAKELONG( (INT16)msg->pt.x, (INT16)msg->pt.y );
msg = tmpMsg;
msgQueue->GetMessageTimeVal = msg.time;
msgQueue->GetMessagePosVal = MAKELONG( (INT16)msg.pt.x, (INT16)msg.pt.y );
msgQueue->GetMessageExtraInfoVal = qmsg->extraInfo;
if (flags & PM_REMOVE) QUEUE_RemoveMsg( msgQueue, qmsg );
@ -1220,11 +1221,11 @@ static BOOL MSG_PeekMessage( int type, LPMSG msg, HWND hwnd,
/* Now find a hardware event */
if (MSG_PeekHardwareMsg( msg, hwnd, first, last, flags & PM_REMOVE ))
if (MSG_PeekHardwareMsg( &msg, hwnd, first, last, flags & PM_REMOVE ))
{
/* Got one */
msgQueue->GetMessageTimeVal = msg->time;
msgQueue->GetMessagePosVal = MAKELONG( (INT16)msg->pt.x, (INT16)msg->pt.y );
msgQueue->GetMessageTimeVal = msg.time;
msgQueue->GetMessagePosVal = MAKELONG( (INT16)msg.pt.x, (INT16)msg.pt.y );
msgQueue->GetMessageExtraInfoVal = 0; /* Always 0 for now */
break;
}
@ -1239,21 +1240,21 @@ static BOOL MSG_PeekMessage( int type, LPMSG msg, HWND hwnd,
if (QUEUE_TestWakeBit(msgQueue, mask & QS_PAINT))
{
WND* wndPtr;
msg->hwnd = WIN_FindWinToRepaint( hwnd , hQueue );
msg->message = WM_PAINT;
msg->wParam = 0;
msg->lParam = 0;
msg.hwnd = WIN_FindWinToRepaint( hwnd , hQueue );
msg.message = WM_PAINT;
msg.wParam = 0;
msg.lParam = 0;
if ((wndPtr = WIN_FindWndPtr(msg->hwnd)))
if ((wndPtr = WIN_FindWndPtr(msg.hwnd)))
{
if( wndPtr->dwStyle & WS_MINIMIZE &&
(HICON) GetClassLongA(wndPtr->hwndSelf, GCL_HICON) )
{
msg->message = WM_PAINTICON;
msg->wParam = 1;
msg.message = WM_PAINTICON;
msg.wParam = 1;
}
if( !hwnd || msg->hwnd == hwnd || IsChild16(hwnd,msg->hwnd) )
if( !hwnd || msg.hwnd == hwnd || IsChild16(hwnd,msg.hwnd) )
{
if( wndPtr->flags & WIN_INTERNAL_PAINT && !wndPtr->hrgnUpdate)
{
@ -1278,7 +1279,7 @@ static BOOL MSG_PeekMessage( int type, LPMSG msg, HWND hwnd,
if (QUEUE_TestWakeBit(msgQueue, mask & QS_TIMER))
{
if (TIMER_GetTimerMsg(msg, hwnd, hQueue, flags & PM_REMOVE)) break;
if (TIMER_GetTimerMsg(&msg, hwnd, hQueue, flags & PM_REMOVE)) break;
}
if (peek)
@ -1303,25 +1304,30 @@ static BOOL MSG_PeekMessage( int type, LPMSG msg, HWND hwnd,
/* We got a message */
if (flags & PM_REMOVE)
{
WORD message = msg->message;
WORD message = msg.message;
if (message == WM_KEYDOWN || message == WM_SYSKEYDOWN)
{
BYTE *p = &QueueKeyStateTable[msg->wParam & 0xff];
BYTE *p = &QueueKeyStateTable[msg.wParam & 0xff];
if (!(*p & 0x80))
*p ^= 0x01;
*p |= 0x80;
}
else if (message == WM_KEYUP || message == WM_SYSKEYUP)
QueueKeyStateTable[msg->wParam & 0xff] &= ~0x80;
QueueKeyStateTable[msg.wParam & 0xff] &= ~0x80;
}
/* copy back our internal safe copy of message data to msg_out.
* msg_out is a variable from the *program*, so it can't be used
* internally as it can get "corrupted" by our use of SendMessage()
* (back to the program) inside the message handling itself. */
*msg_out = msg;
if (peek)
return TRUE;
else
return (msg->message != WM_QUIT);
return (msg.message != WM_QUIT);
}
/***********************************************************************