/*
 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
 *
 * SPDX-License-Identifier: MPL-2.0
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, you can obtain one at https://mozilla.org/MPL/2.0/.
 *
 * See the COPYRIGHT file distributed with this work for additional
 * information regarding copyright ownership.
 */

#include <stddef.h>
#include <stdint.h>

#include <isc/buffer.h>
#include <isc/lex.h>
#include <isc/mem.h>
#include <isc/string.h>
#include <isc/util.h>

#include "fuzz.h"

bool debug = false;

int
LLVMFuzzerInitialize(int *argc ISC_ATTR_UNUSED, char ***argv ISC_ATTR_UNUSED);

int
LLVMFuzzerTestOneInput(const uint8_t *data, size_t size);

static isc_mem_t *mctx = NULL;
static isc_lex_t *lex = NULL;

int
LLVMFuzzerInitialize(int *argc ISC_ATTR_UNUSED, char ***argv ISC_ATTR_UNUSED) {
	isc_mem_create("fuzz", &mctx);
	isc_lex_create(mctx, 1024, &lex);

	return 0;
}

int
LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
	isc_buffer_t buf;
	isc_result_t result;
	isc_token_t token;
	isc_tokentype_t expect;
	bool eol;

	if (size < sizeof(expect) + sizeof(eol)) {
		return 0;
	}

	(void)memmove(&expect, data, sizeof(expect));
	data += sizeof(expect);
	size -= sizeof(expect);

	eol = *data != 0;
	data += 1;
	size -= 1;

	isc_buffer_constinit(&buf, data, size);
	isc_buffer_add(&buf, size);
	isc_buffer_setactive(&buf, size);

	CHECK(isc_lex_openbuffer(lex, &buf));

	do {
		result = isc_lex_getmastertoken(lex, &token, expect, eol);
	} while (result == ISC_R_SUCCESS && token.type != isc_tokentype_eof);

cleanup:
	return 0;
}
