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From: gwyn@brl-tgr.ARPA (Doug Gwyn <gwyn>)
Newsgroups: net.unix,net.unix-wizards
Subject: Re: "_doprnt" query
Message-ID: <948@brl-tgr.ARPA>
Date: Fri, 20-Dec-85 17:25:47 EST
Article-I.D.: brl-tgr.948
Posted: Fri Dec 20 17:25:47 1985
Date-Received: Sun, 22-Dec-85 01:24:06 EST
References: <280@ur-tut.UUCP> <491@brl-tgr.ARPA> <398@codas.UUCP>
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Xref: watmath net.unix:6689 net.unix-wizards:16203

> > > I am trying to get a screen editor working on my Fortune 32:16 system.  It
> > > keeps crashing in the routine "_doprnt" (giving me a memory addressing error).
> > > I can't seem to find any documentation on it.
> > 
> > _doprnt() is used internally by the printf() family of functions.
> > One common cause of crashes in it is passing a bum pointer for a
> > %s format spec, or not having the correct number of arguments.
> 
> A common missuse of scanf and sprintf, is calling by value and
> not by address. The target variable should be called by address.

All the printf family are called by value.
What you say is try for scanf family usage errors, though.