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* libfdt - Flat Device Tree manipulation
* Testcase for fdt_path_offset()
* Copyright (C) 2006 David Gibson, IBM Corporation.
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <libfdt.h>
#include "tests.h"
#include "testdata.h"
static int check_subnode(void *fdt, int parent, const char *name)
int offset;
const struct fdt_node_header *nh;
uint32_t tag;
verbose_printf("Checking subnode \"%s\" of %d...", name, parent);
offset = fdt_subnode_offset(fdt, parent, name);
verbose_printf("offset %d...", offset);
if (offset < 0)
FAIL("fdt_subnode_offset(\"%s\"): %s", name, fdt_strerror(offset));
nh = fdt_offset_ptr(fdt, offset, sizeof(*nh));
verbose_printf("pointer %p\n", nh);
if (! nh)
FAIL("NULL retrieving subnode \"%s\"", name);
tag = fdt32_to_cpu(nh->tag);
if (tag != FDT_BEGIN_NODE)
FAIL("Incorrect tag 0x%08x on property \"%s\"", tag, name);
if (!nodename_eq(nh->name, name))
FAIL("Subnode name mismatch \"%s\" instead of \"%s\"",
nh->name, name);
return offset;
static void check_path_offset(void *fdt, char *path, int offset)
int rc;
verbose_printf("Checking offset of \"%s\" is %d...\n", path, offset);
rc = fdt_path_offset(fdt, path);
if (rc < 0)
FAIL("fdt_path_offset(\"%s\") failed: %s",
path, fdt_strerror(rc));
if (rc != offset)
FAIL("fdt_path_offset(\"%s\") returned incorrect offset"
" %d instead of %d", path, rc, offset);
static void check_path_offset_namelen(void *fdt, char *path, int namelen,
int offset)
int rc;
verbose_printf("Checking offset of \"%s\" [first %d characters]"
" is %d...\n", path, namelen, offset);
rc = fdt_path_offset_namelen(fdt, path, namelen);
if (rc == offset)
if (rc < 0)
FAIL("fdt_path_offset_namelen(\"%s\", %d) failed: %s",
path, namelen, fdt_strerror(rc));
FAIL("fdt_path_offset_namelen(\"%s\", %d) returned incorrect"
" offset %d instead of %d", path, namelen, rc, offset);
int main(int argc, char *argv[])
void *fdt;
int subnode1_offset, subnode2_offset;
int subsubnode1_offset, subsubnode2_offset, subsubnode2_offset2;
test_init(argc, argv);
fdt = load_blob_arg(argc, argv);
check_path_offset(fdt, "/", 0);
subnode1_offset = check_subnode(fdt, 0, "subnode@1");
subnode2_offset = check_subnode(fdt, 0, "subnode@2");
check_path_offset(fdt, "/subnode@1", subnode1_offset);
check_path_offset(fdt, "/subnode@2", subnode2_offset);
subsubnode1_offset = check_subnode(fdt, subnode1_offset, "subsubnode");
subsubnode2_offset = check_subnode(fdt, subnode2_offset, "subsubnode@0");
subsubnode2_offset2 = check_subnode(fdt, subnode2_offset, "subsubnode");
check_path_offset(fdt, "/subnode@1/subsubnode", subsubnode1_offset);
check_path_offset(fdt, "/subnode@2/subsubnode@0", subsubnode2_offset);
check_path_offset(fdt, "/subnode@2/subsubnode", subsubnode2_offset2);
/* Test paths with extraneous separators */
check_path_offset(fdt, "//", 0);
check_path_offset(fdt, "///", 0);
check_path_offset(fdt, "//subnode@1", subnode1_offset);
check_path_offset(fdt, "/subnode@1/", subnode1_offset);
check_path_offset(fdt, "//subnode@1///", subnode1_offset);
check_path_offset(fdt, "/subnode@2////subsubnode", subsubnode2_offset2);
/* Test fdt_path_offset_namelen() */
check_path_offset_namelen(fdt, "/subnode@1", 1, 0);
check_path_offset_namelen(fdt, "/subnode@1/subsubnode", 10, subnode1_offset);
check_path_offset_namelen(fdt, "/subnode@1/subsubnode", 11, subnode1_offset);
check_path_offset_namelen(fdt, "/subnode@2TRAILINGGARBAGE", 10, subnode2_offset);
check_path_offset_namelen(fdt, "/subnode@2TRAILINGGARBAGE", 11, -FDT_ERR_NOTFOUND);
check_path_offset_namelen(fdt, "/subnode@2/subsubnode@0/more", 23, subsubnode2_offset2);
check_path_offset_namelen(fdt, "/subnode@2/subsubnode@0/more", 22, -FDT_ERR_NOTFOUND);
check_path_offset_namelen(fdt, "/subnode@2/subsubnode@0/more", 24, subsubnode2_offset2);
check_path_offset_namelen(fdt, "/subnode@2/subsubnode@0/more", 25, -FDT_ERR_NOTFOUND);