Add more signatures for Windows API functions

[ceeac]

Currently, decompilation of Windows executables produces unreadable and/or semantically wrong output because the signatures for most of the Windows API functions are missing. We should add signatures for at least the most commonly used ones.

[cb88]

Wouldn't support for automatic signature generation make sense also? Then just point boomerang at the windows SDK etc?

[ceeac]

Yes, but there are a few more points to consider:

• The current signature parser (AnsiC{Parser.y,Scanner.l}) only supports a subset of C so it would need to be expanded to support reading 'real-world' header files. It might also be possible to use clang for this; see #17.
• Boomerang currently also infers other information from the header files: For example, currently a call to __isoc99_scanf is automatically converted to a call to scanf. This information would need to be incorporated.

That said, a tool for automatically generating Bomerang compatible function signature information from header files will definitely be useful. But that is certainly not a "good first issue"/easy kind of task.