The UPPERCASE macro converts a string or a part of it to upper case. It has two arguments: The length indicator can be smaller than one or larger than the length of the string; in that case, the whole string is convertered. Example:
UPPERCASE(hello world)(1)
UPPERCASE(hello world)(5)
UPPERCASE(hello world)(0)

This code sample expands to:

Hello world
HELLO world
HELLO WORLD

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