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      1 /*	$NetBSD: parent_offset.c,v 1.1.1.3 2019/12/22 12:34:07 skrll Exp $	*/
      2 
      3 // SPDX-License-Identifier: LGPL-2.1-or-later
      4 /*
      5  * libfdt - Flat Device Tree manipulation
      6  *	Testcase for fdt_parent_offset()
      7  * Copyright (C) 2006 David Gibson, IBM Corporation.
      8  */
      9 #include <stdlib.h>
     10 #include <stdio.h>
     11 #include <string.h>
     12 #include <stdint.h>
     13 
     14 #include <libfdt.h>
     15 
     16 #include "tests.h"
     17 #include "testdata.h"
     18 
     19 static int path_parent_len(const char *path)
     20 {
     21 	const char *p = strrchr(path, '/');
     22 
     23 	if (!p)
     24 		TEST_BUG();
     25 	if (p == path)
     26 		return 1;
     27 	else
     28 		return p - path;
     29 }
     30 
     31 static void check_path(struct fdt_header *fdt, const char *path)
     32 {
     33 	char *parentpath;
     34 	int nodeoffset, parentoffset, parentpathoffset, pathparentlen;
     35 
     36 	pathparentlen = path_parent_len(path);
     37 	parentpath = alloca(pathparentlen + 1);
     38 	strncpy(parentpath, path, pathparentlen);
     39 	parentpath[pathparentlen] = '\0';
     40 
     41 	verbose_printf("Path: \"%s\"\tParent: \"%s\"\n", path, parentpath);
     42 
     43 	nodeoffset = fdt_path_offset(fdt, path);
     44 	if (nodeoffset < 0)
     45 		FAIL("fdt_path_offset(%s): %s", path, fdt_strerror(nodeoffset));
     46 
     47 	parentpathoffset = fdt_path_offset(fdt, parentpath);
     48 	if (parentpathoffset < 0)
     49 		FAIL("fdt_path_offset(%s): %s", parentpath,
     50 		     fdt_strerror(parentpathoffset));
     51 
     52 	parentoffset = fdt_parent_offset(fdt, nodeoffset);
     53 	if (parentoffset < 0)
     54 		FAIL("fdt_parent_offset(): %s", fdt_strerror(parentoffset));
     55 
     56 	if (parentoffset != parentpathoffset)
     57 		FAIL("fdt_parent_offset() returns %d instead of %d",
     58 		     parentoffset, parentpathoffset);
     59 }
     60 
     61 int main(int argc, char *argv[])
     62 {
     63 	void *fdt;
     64 	int err;
     65 
     66 	test_init(argc, argv);
     67 	fdt = load_blob_arg(argc, argv);
     68 
     69 	check_path(fdt, "/subnode@1");
     70 	check_path(fdt, "/subnode@2");
     71 	check_path(fdt, "/subnode@1/subsubnode");
     72 	check_path(fdt, "/subnode@2/subsubnode@0");
     73 	err = fdt_parent_offset(fdt, 0);
     74 	if (err != -FDT_ERR_NOTFOUND)
     75 		FAIL("fdt_parent_offset(/) returns %d instead of "
     76 		     "-FDT_ERR_NOTFOUND", err);
     77 
     78 	PASS();
     79 }
     80