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Find out how much data is available when calling ReadFileEx.

This commit is contained in:
Mike McCormack 2001-11-08 17:06:08 +00:00 committed by Alexandre Julliard
parent 6c58cdce16
commit daf347ac8b
1 changed files with 14 additions and 2 deletions
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16
dlls/user/comm16.c
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@ -362,13 +362,25 @@ static VOID WINAPI COMM16_WriteComplete(DWORD status, DWORD len, LPOVERLAPPED ov
static void comm_waitread(struct DosDeviceStruct *ptr)
{
int bleft;
COMSTAT stat;
/* FIXME: get timeouts working properly so we can read bleft bytes */
bleft = ((ptr->ibuf_tail > ptr->ibuf_head) ?
(ptr->ibuf_tail-1) : ptr->ibuf_size) - ptr->ibuf_head;
/* FIXME: get timeouts working properly so we can read bleft bytes */
/* find out how many bytes are left in the buffer */
if(ClearCommError(ptr->handle,NULL,&stat))
bleft = (bleft<stat.cbInQue) ? bleft : stat.cbInQue;
else
bleft = 1;
/* always read at least one byte */
if(bleft==0)
bleft++;
ReadFileEx(ptr->handle,
ptr->inbuf + ptr->ibuf_head,
1,
bleft,
&ptr->read_ov,
COMM16_ReadComplete);
}