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.