Have a look at the following two messages from Marcus Meissner to wine-devel and wine-patches:
Hmm, those links dont work for me, however I remember:
The header files for stdio have macro versions of putc/getc so your implementation must use the FILE structure fields in a binary compatable way (as they are currently; I implemented the code to pretend that the buffer is alway empty and needs to be reread/put on every operation).
Provided you can make optimised VC++ compiled programs (i.e. those that use the macro version of get/putc) work, you dont have any extra threading issues that the code should handle already (but probably doesn't; large sections are not yet thread safed). The performance improvement would be significant also.
You should make sure you test your changes thoroughly tho, as the file code is rather vital to avoiding needing native msvcrt ;-)
Cheers, Jon
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Jon Griffiths