[llvm-bugs] Why utf convertion functions requires output buffer to be empty?

[Xpol Wan via llvm-bugs]

The function convertUTF16ToUTF8String and convertUTF8ToUTF16String defined
in lib/Support/ConvertUTFWrapper.cpp has an assertion that out buffer
should be empty.

But why is these assertion necessary?

see:

https://github.com/llvm-mirror/llvm/blob/master/lib/Support/ConvertUTFWrapper.cpp#L85
https://github.com/llvm-mirror/llvm/blob/master/lib/Support/ConvertUTFWrapper.cpp#L135

Best Regards!

Xpol Wan
// There is a better way!
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