/*-
 * Copyright (c) 2010 Marcel Moolenaar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <libefi.h>
#include <stdlib.h>

#include "libefi_int.h"

/*
 * EFI_STATUS
 * GetNextVariableName(
 *	IN OUT UINTN	*VariableNameSize,
 *	IN OUT CHAR16	*VariableName,
 *	IN OUT EFI_GUID	*VendorGuid
 *    );
 */

int
efi_nextvarname(size_t *namesize, char *name, uuid_t *vendor)
{
	struct iodev_efivar_req req;
	int error;

	req.namesize = *namesize;
	error = libefi_utf8_to_ucs2(name, &req.namesize, &req.name);
	if (error)
		return (error);

	req.vendor = *vendor;
	req.access = IODEV_EFIVAR_NEXTNAME;
	error = libefi_efivar(&req);
	*namesize = req.namesize;
	if (!error) {
		error = libefi_ucs2_to_utf8(req.name, namesize, name);
		if (!error)
			*vendor = req.vendor;
	}
	free(req.name);
	return (error);
}