Why vprintf and not %r?

[Sam Kendall]

The new functions in System V.2, vprintf, vfprintf, and vsprintf,
provide the functionality of calling _doprnt directly.  I would
like to know why these three new functions were defined when printf
under V7 already had a solution, albeit undocumented: the %r
conversion code.  %r could have been defined in terms of the
varargs macros, and still have been upward compatible from V7.
*Sigh*.

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