DDK docs define functions named RtlStringCbCopyA and similar to use instead of snprintf etc. I ended up using a private implementation of snprintf (since I'm linking with -nostdlib) but the mapping of these functions into posix ones should be in the headers.
map ms RtlString functions to posix functions
changelog
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Your patch has been accepted and is now commited to CVS. You should expect to see it in the next release.