[Bug 2960] New: Bug in int 21, function 3f (read) causing WATCOM Win386 Read error
Wine Bugs
wine-bugs at winehq.org
Sat May 14 00:39:40 CDT 2005
http://bugs.winehq.org/show_bug.cgi?id=2960
Summary: Bug in int 21, function 3f (read) causing WATCOM Win386
Read error
Product: Wine
Version: unspecified
Platform: All
OS/Version: All
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: wine-dos
AssignedTo: wine-bugs at winehq.org
ReportedBy: lupien at physique.usherbrooke.ca
An old windows 3.1 program (compiled with a watcom compiler) was failing with
the message Read Error in a window called WATCOM Win386. I found the problem was
due to count being set to 0 in int21, function 3f. In my case the
GetSelectorLimit16 was set at 0xffff (DX was set 0) and would make maxcount 0.
Below is a simple fix (making maxcount a double).
in dlls/winedos
--- int21.c.orig 2005-05-13 21:21:32.000000000 -0400
+++ int21.c 2005-05-13 21:24:36.000000000 -0400
@@ -4744,7 +4744,7 @@
/* Some programs pass a count larger than the allocated buffer */
if (DOSVM_IsWin16())
{
- WORD maxcount = GetSelectorLimit16( context->SegDs )
+ DWORD maxcount = GetSelectorLimit16( context->SegDs )
- DX_reg(context) + 1;
if (count > maxcount)
count = maxcount;
--
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