[PATCH] Accept %k format specifier

[Jonathan Schleifer]

I wrote a new patch now which introduces __attribute__((format(__OFString__, …, …))). When the type is __OFString__, %C and %S are considered to be type of_unichar_t / const of_unichar_t*. %k and %K are completely gone now. This is similar to how %C and %S are treated when the type is __NSString__, where they are treated as unichar / const unichar* then.

Please review the patch as I had to replace a few bools indicating whether the type is an ObjC format by a type so that there is a way to differentiate between __NSString__ and __OFString__. This also means I had to change a few function definitions and declarations.

There are no tests yet, but if this patch is otherwise good, I will add some.

--
Jonathan
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