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      1 /*	$NetBSD: subnode_iterate.c,v 1.1.1.3 2019/12/22 12:34:06 skrll Exp $	*/
      2 
      3 // SPDX-License-Identifier: LGPL-2.1-or-later
      4 /*
      5  * libfdt - Flat Device Tree manipulation
      6  *	Tests that fdt_next_subnode() works as expected
      7  *
      8  * Copyright (C) 2013 Google, Inc
      9  *
     10  * Copyright (C) 2007 David Gibson, IBM Corporation.
     11  */
     12 
     13 #include <stdlib.h>
     14 #include <stdio.h>
     15 #include <string.h>
     16 #include <stdint.h>
     17 
     18 #include <libfdt.h>
     19 
     20 #include "tests.h"
     21 #include "testdata.h"
     22 
     23 static void test_node(void *fdt, int parent_offset)
     24 {
     25 	uint32_t subnodes;
     26 	const fdt32_t *prop;
     27 	int offset;
     28 	int count;
     29 	int len;
     30 
     31 	/* This property indicates the number of subnodes to expect */
     32 	prop = fdt_getprop(fdt, parent_offset, "subnodes", &len);
     33 	if (!prop || len != sizeof(fdt32_t)) {
     34 		FAIL("Missing/invalid subnodes property at '%s'",
     35 		     fdt_get_name(fdt, parent_offset, NULL));
     36 	}
     37 	subnodes = fdt32_to_cpu(*prop);
     38 
     39 	count = 0;
     40 	fdt_for_each_subnode(offset, fdt, parent_offset)
     41 		count++;
     42 
     43 	if (count != subnodes) {
     44 		FAIL("Node '%s': Expected %d subnodes, got %d\n",
     45 		     fdt_get_name(fdt, parent_offset, NULL), subnodes,
     46 		     count);
     47 	}
     48 }
     49 
     50 static void check_fdt_next_subnode(void *fdt)
     51 {
     52 	int offset;
     53 	int count = 0;
     54 
     55 	fdt_for_each_subnode(offset, fdt, 0) {
     56 		test_node(fdt, offset);
     57 		count++;
     58 	}
     59 
     60 	if (count != 2)
     61 		FAIL("Expected %d tests, got %d\n", 2, count);
     62 }
     63 
     64 int main(int argc, char *argv[])
     65 {
     66 	void *fdt;
     67 
     68 	test_init(argc, argv);
     69 	if (argc != 2)
     70 		CONFIG("Usage: %s <dtb file>", argv[0]);
     71 
     72 	fdt = load_blob(argv[1]);
     73 	if (!fdt)
     74 		FAIL("No device tree available");
     75 
     76 	check_fdt_next_subnode(fdt);
     77 
     78 	PASS();
     79 }
     80