[Bug 54379] since wine 8.0 print doesn't work any more

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=54379

--- Comment #20 from Eugene Savelov  ---
(In reply to Piotr Caban from comment #16)
> (In reply to MaranBr from comment #6)
> > Created attachment 74015 [details]
> > Trace file of print processor
>
> The problem is visible in this line:
> 0374:trace:winspool:StartDocPrinterW (00000003, 1, 0021F008 {L"", L"",
> (null)})
>
> Supplied DOC_INFO_1 structure passes empty string as pOutputFile. Probably
> we should handle empty string in the same way as NULL here but I will need
> to run some tests. Because of that, later, we're trying to use empty string
> as port name.

after applying below fix on wine 8.2 printing now works!

--- dlls/gdi32/dc.orig.c        2023-02-20 00:09:19.960931092 +0300
+++ dlls/gdi32/dc.c     2023-02-20 00:11:48.483031851 +0300
@@ -274,6 +274,7 @@
         {
             memcpy( port, output, output_str.Length );
             port[output_str.Length / sizeof(WCHAR)] = 0;
+           if (output_str.Length == 0) port = NULL;
         }
         dc_attr->hspool = HandleToULong( hspool );
         dc_attr->output = (ULONG_PTR)port;