From owner-freebsd-hackers  Tue Jul 11 19:16: 0 2000
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To: "Gary T. Corcoran" <gcorcoran@lucent.com>
Subject: Re: Module parameters? 
Cc: Mike Smith <msmith@FreeBSD.ORG>,
	FreeBSD Hackers <freebsd-hackers@FreeBSD.ORG>
In-reply-to: Your message of "Tue, 11 Jul 2000 22:01:47 EDT."
		<396BD18B.9155B046@lucent.com> 
References: <396BD18B.9155B046@lucent.com>  <396BC2C5.E89AD827@lucent.com> <200007112355.QAA00803@mass.osd.bsdi.com> <200007112352.RAA08554@harmony.village.org> <200007120148.TAA09591@harmony.village.org> 
Date: Tue, 11 Jul 2000 20:15:46 -0600
From: Warner Losh <imp@village.org>
Sender: owner-freebsd-hackers@FreeBSD.ORG
Precedence: bulk
X-Loop: FreeBSD.ORG

Something like the following?  I know that there's more routines that
need to be written.  parse_int, parse_string, parse_bool, parse_enum
should be enough.

Comments?

struct driver_param
{
	const char *name;
	int (*fnp)(const char *, void *, void *);
	size_t off;
	void *argp;
};

int get_parameters(device_t dev, struct driver_param *param, size_t nparam)
{
	int i;
	caddr_t sc;
	const char *name;
	int unit;
	char buffer[1024];
	const char *cp;

	sc = device_get_softc(dev);
	name = device_get_name(dev);
	unit = device_get_unit(dev);
	for (i = 0; i < nparam; i++) {
		snprintf(buffer, "hints.%s.%d.%s", name, unit, param[i].name);
		cp = getenv (buffer);
		if (cp) {
			if (param[i].fnp(cp, (void *) (sc + param[i].off), 
			    param[i].argp) == 0)
				continue;
		}
		snprintf(buffer, "hints.%s.%d.%s", name, -1, param[i].name);
		cp = getenv (buffer);
		if (cp) {
			if (param[i].fnp(cp, (void *) (sc + param[i].off), 
			    param[i].argp) == 0)
				continue;
		}
	}
	return 0;
}


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