#include <common.h>
#include <param.h>
#include <errno.h>
#include <net.h>
#include <malloc.h>
#include <driver.h>

struct param_d *get_param_by_name(struct device_d *dev, const char *name)
{
        struct param_d *param = dev->param;

        while (param) {
                if (!strcmp(param->name, name))
                        return param;
                param = param->next;
        }

        return NULL;
}

const char *dev_get_param(struct device_d *dev, const char *name)
{
        struct param_d *param = get_param_by_name(dev, name);

	if (!param) {
		errno = -EINVAL;
		return NULL;
	}

        if (param->get)
                return param->get(dev, param);

        return param->value;
}

IPaddr_t dev_get_param_ip(struct device_d *dev, char *name)
{
	return string_to_ip(dev_get_param(dev, name));
}

int dev_set_param_ip(struct device_d *dev, char *name, IPaddr_t ip)
{
	char ipstr[16];
	ip_to_string(ip, ipstr);

	return dev_set_param(dev, name, ipstr);
}

int dev_set_param(struct device_d *dev, const char *name, const char *val)
{
        struct param_d *param;

	if (!dev) {
		errno = -ENODEV;
		return -ENODEV;
	}

	param = get_param_by_name(dev, name);

	if (!param) {
		errno = -EINVAL;
		return -EINVAL;
	}

	if (param->flags & PARAM_FLAG_RO) {
		errno = -EACCES;
		return -EACCES;
	}

        if (param->set)
                return param->set(dev, param, val);

	if (param->value)
		free(param->value);

        param->value = strdup(val);
	return 0;
}

int dev_add_param(struct device_d *dev, struct param_d *newparam)
{
        struct param_d *param = dev->param;

        newparam->next = 0;

        if (param) {
                while (param->next)
                        param = param->next;
                        param->next = newparam;
        } else {
                dev->param = newparam;
        }

        return 0;
}