[Bug 38558] cmd.exe bundled with Windows XP messed up when using FOR /F

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=38558

--- Comment #7 from Jason Edmeades <us at edmeades.me.uk> ---
A short investigation shows the problem here is simply the way wine does data
conversion from single to doublebyte - it does 16 bytes at a time, but this
ends up corrupting the buffer if the src overlaps the dest. A simple patch is
applied, which gets things going, but I have no ideas if it would be acceptable
to wine as potentially there's a performance hit here.

Re the %? - Given its such an edge case I'll wait until someone reports a need
for it before trying to add it to wine, as the code is specific for a-z, A-Z at
the moment. No idea if there's any others either!

Either way my only priority at the moment is to get wine's cmd running for
these kind of test cases. I've found a problem as a result of this bug report
for which I'll submit a patch, but the issue of getting windows XP's cmd.exe
running is outside my scope. Either way, its definitely not a 'cmd' component
problem, assigning to kernel32 which is where I think the converions would come
under

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