Testing edge cases and undocumented behavior
fgouget at free.fr
Fri Aug 26 02:52:35 CDT 2011
On Thu, 25 Aug 2011, Vincent Povirk wrote:
> * Is a Windows application likely to need this?
I'd add a couple of factors that pertain to this:
* Is the behavior documented by the MSDN? If yes then applications are
more likely to rely on it.
* Does the behavior correspond to a known usage pattern? If yes, then
even if not documented in the MSDN, applications are likely to depend
on it. Two examples:
- APIs that take an 'LPSTR output_buffer, DWORD *buffer_size' pair of
parameters. If they allow the programmer to pass 'NULL, &size'
where size=0 as parameters to determine the required buffer size,
then you can expect applications to make use of it even if the MSDN
forgot to document it.
- APIs that take output parameters and will simply not fill them if
the pointer is NULL instead of crashing.
Of course the first thing to test is that these are are actually
supported across a broad swath of the more recent Windows versions.
Francois Gouget <fgouget at free.fr> http://fgouget.free.fr/
Avoid the Gates of Hell - use Linux.
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