lvm2/lib/filters/filter-composite.c

/*
 * Copyright (C) 2001 Sistina Software (UK) Limited.
 *
 * This file is released under the LGPL.
 */

#include "filter-composite.h"
#include "dbg_malloc.h"
#include "log.h"

#include <stdarg.h>

static int _and_p(struct dev_filter *f, struct device *dev)
{
	struct dev_filter **filters = (struct dev_filter **) f->private;

	while (*filters) {
		if (!(*filters)->passes_filter(*filters, dev))
			return 0;
		filters++;
	}

	return 1;
}

static void _destroy(struct dev_filter *f)
{
	struct dev_filter **filters = (struct dev_filter **) f->private;

	while (*filters) {
		(*filters)->destroy(*filters);
		filters++;
	}

	dbg_free(f->private);
	dbg_free(f);
}

struct dev_filter *composite_filter_create(int n, ...)
{
	struct dev_filter **filters = dbg_malloc(sizeof(*filters) * (n + 1));
	struct dev_filter *cf;
	va_list ap;
	int i;

	if (!filters) {
		stack;
		return NULL;
	}

	if (!(cf = dbg_malloc(sizeof(*cf)))) {
		stack;
		dbg_free(filters);
		return NULL;
	}

	va_start(ap, n);
	for (i = 0; i < n; i++) {
		struct dev_filter *f = va_arg(ap, struct dev_filter *);
		filters[i] = f;
	}
	filters[i] = NULL;
	va_end(ap);

	cf->passes_filter = _and_p;
	cf->destroy = _destroy;
	cf->private = filters;

	return cf;
}