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From: gwyn@BRL.ARPA (VLD/VMB)
Newsgroups: net.lang.c
Subject: Re:  variable # of args portability?
Message-ID: <2009@brl-smoke.ARPA>
Date: Mon, 7-Jul-86 22:02:54 EDT
Article-I.D.: brl-smok.2009
Posted: Mon Jul  7 22:02:54 1986
Date-Received: Wed, 9-Jul-86 01:22:57 EDT
Sender: news@brl-smoke.ARPA
Lines: 15

Most UNIX and some other C implementations have a <varargs.h>
header file that defines macros for getting at variably-sized
argument lists; unfortunately this is not sufficient for an
interface to a printf-like routine, where you need to pass
the remaining argument list along.  Many UNIX and some other C
implementations provide v*printf functions that are useful
in such situations.  There is normally some function like
_doprnt in the C library, but it may go by another name and
have slightly different arguments.

For the time being, people usually either invoke *printf using
functions with fixed arguments (perhaps several of them to
cover all necessary cases) or provide an interface that must
be adapted by each site.  Other commonly-used approaches tend
to be non-portable.