Date: Tue, 10 Feb 2004 20:20:25 +0000 From: Ben Smithurst <ben@FreeBSD.org> To: Bill Moran <wmoran@potentialtech.com> Cc: freebsd-chat@freebsd.org Subject: Re: Could use some help with variable length argument lists Message-ID: <20040210202025.GA93986@strontium.bcxs.net> In-Reply-To: <40293B38.30401@potentialtech.com> References: <40293B38.30401@potentialtech.com>
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Bill Moran wrote:
> char **format, **errmsg;
>=20
> va_start(ap, message);
> if (level <=3D LOGLEVEL) {
> asprintf(format, "PID %d: %s", getpid(), message);
=2E..
> Doesn't seem too difficult, right? However, if I call the function
> from elsewhere in my application like this:
>=20
> _log(1, "Log test");
>=20
> I get a coredump! gdb complains that message is "out of bounds"
> on the line "asprintf(format, "PID %d: %s", getpid(), message);"
are you sure it isn't the format variable causing the problem? It's
a while since I've used asprintf() but from memory you should write
something more like
char *format;
=2E..
asprintf(&format, "PID %d: %s", getpid(), message);
Your code above is passing format uninitialized (you should have got a
compile time warning about that).
Or maybe I'm misunderstanding something. :-)
--=20
Ben Smithurst / ben@FreeBSD.org FreeBSD: The Power To Serve
http://www.FreeBSD.org/
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