Alright, I wrote up another patch that uses strchr to parse out the lines of the unaccent.rules file, foregoing sscanf completely. Hopefully this looks a bit better than using swscanf.
As for the other problems with isspace and such on OSX, it might be worth looking at the python portability fixes. I played briefly with the isspace and friends macros they have and they looked okay, but I certainly can't speak for how well they'd work for the rest of the PostgreSQL code base. Cheers.
0001-Fix-weirdness-when-dealing-with-UTF-8-in-buggy-libc-.patch
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