platform_external_dtc/tests/overlay_bad_fixup.c

// SPDX-License-Identifier: LGPL-2.1-or-later
/*
 * libfdt - Flat Device Tree manipulation
 *	Testcase for DT overlays()
 * Copyright (C) 2016 Free Electrons
 * Copyright (C) 2016 NextThing Co.
 */

#include <stdio.h>

#include <libfdt.h>

#include "tests.h"

#define CHECK(code, expected)					\
	{							\
		err = (code);					\
		if (err != expected)				\
			FAIL(#code ": %s", fdt_strerror(err));	\
	}

/* 4k ought to be enough for anybody */
#define FDT_COPY_SIZE	(4 * 1024)

static void *open_dt(char *path)
{
	void *dt, *copy;
	int err;

	dt = load_blob(path);
	copy = xmalloc(FDT_COPY_SIZE);

	/*
	 * Resize our DTs to 4k so that we have room to operate on
	 */
	CHECK(fdt_open_into(dt, copy, FDT_COPY_SIZE), 0);

	return copy;
}

int main(int argc, char *argv[])
{
	void *fdt_base, *fdt_overlay;
	int err;

	test_init(argc, argv);
	if (argc != 3)
		CONFIG("Usage: %s <base dtb> <overlay dtb>", argv[0]);

	fdt_base = open_dt(argv[1]);
	fdt_overlay = open_dt(argv[2]);

	/* Apply the overlay */
	CHECK(fdt_overlay_apply(fdt_base, fdt_overlay), -FDT_ERR_BADOVERLAY);

	PASS();
}