From: utzoo!decvax!duke!harpo!npoiv!npois!cbosgd!mark
Newsgroups: net.unix-wizards
Title: Re:  %r format item in some printf implementations
Article-I.D.: cbosgd.2635
Posted: Sun Sep 19 12:04:27 1982
Received: Tue Sep 21 04:04:05 1982
References: sri-unix.3346

Caution: at least one version of UNIX (Zilog's) passes the first
few arguments to each function in registers, and the remaining
ones on the stack.  There are obvious performance gains here, but
implementing either %r or varargs.h would be nontrivial.

There is a manual page for varargs.h in 4.1BSD in section 3.  The
version of printf in vi version 3 uses varargs.h.