It's a common C macro idiom, that makes a multi-statment macro behave like a single statement. See http://stackoverflow.com/questions/154136/do-while-and-if-el

It's a common C macro idiom, that makes a multi-statment macro behave like a single statement. See http://stackoverflow.com/questions/154136/do-while-and-if-else-statements-in-c-c-macros http://stackoverflow.com/questions/154136/do-while-and-if-el...