From: Robert Kiesling <kiesling@earthlink.net>
To: gcc-help@gcc.gnu.org
Subject: Re: Variable function arguments and the stack
Date: Sun, 09 Dec 2007 14:30:00 -0000 [thread overview]
Message-ID: <E1J1NAB-00042M-GW@owl.gateway.2wire.net> (raw)
> David Daney wrote:
> > Robert Kiesling wrote:
> > > I trying to write a function that calls libc functions with
> > > variable arguments - for example, scanf. I would like to do
> > > this by pushing the arguments onto the stack and then calling
> > > the function, something like this. (This code is for an x86
> > > machine.)
> > >
> > > static long long int scalar_args[512];
> > > static char *ptr_args[512][BUFSIZE];
> >
> > Use libffi which ships with GCC. Doing things like this is what it was
> > designed for.
Libffi clobbers either the arguments or the stream argument (the
first argument before the format string in functions like fprintf
or sprintf). It should make a distinction whether the args or
the stream are writeable or readable, and that, of course is the
idea.
Regards,
Robert
--
Ctalk Home Page: http://www.ctalklang.org/
next reply other threads:[~2007-12-09 14:30 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-09 14:30 Robert Kiesling [this message]
2007-12-15 8:30 ` Andrew Haley
-- strict thread matches above, loose matches on Subject: below --
2007-12-06 0:00 Robert Kiesling
2007-12-06 0:11 ` David Daney
2007-12-06 0:41 ` Robert Kiesling
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