1 files changed, 77 insertions, 0 deletions
diff --git a/dtc/tests/parent_offset.c b/dtc/tests/parent_offset.c
new file mode 100644
index 000000000..a935a5374
--- /dev/null
+++ b/dtc/tests/parent_offset.c
@@ -0,0 +1,77 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+/*
+ * libfdt - Flat Device Tree manipulation
+ *	Testcase for fdt_parent_offset()
+ * Copyright (C) 2006 David Gibson, IBM Corporation.
+ */
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdint.h>
+
+#include <libfdt.h>
+
+#include "tests.h"
+#include "testdata.h"
+
+static int path_parent_len(const char *path)
+{
+	const char *p = strrchr(path, '/');
+
+	if (!p)
+		TEST_BUG();
+	if (p == path)
+		return 1;
+	else
+		return p - path;
+}
+
+static void check_path(struct fdt_header *fdt, const char *path)
+{
+	char *parentpath;
+	int nodeoffset, parentoffset, parentpathoffset, pathparentlen;
+
+	pathparentlen = path_parent_len(path);
+	parentpath = alloca(pathparentlen + 1);
+	strncpy(parentpath, path, pathparentlen);
+	parentpath[pathparentlen] = '\0';
+
+	verbose_printf("Path: \"%s\"\tParent: \"%s\"\n", path, parentpath);
+
+	nodeoffset = fdt_path_offset(fdt, path);
+	if (nodeoffset < 0)
+		FAIL("fdt_path_offset(%s): %s", path, fdt_strerror(nodeoffset));
+
+	parentpathoffset = fdt_path_offset(fdt, parentpath);
+	if (parentpathoffset < 0)
+		FAIL("fdt_path_offset(%s): %s", parentpath,
+		     fdt_strerror(parentpathoffset));
+
+	parentoffset = fdt_parent_offset(fdt, nodeoffset);
+	if (parentoffset < 0)
+		FAIL("fdt_parent_offset(): %s", fdt_strerror(parentoffset));
+
+	if (parentoffset != parentpathoffset)
+		FAIL("fdt_parent_offset() returns %d instead of %d",
+		     parentoffset, parentpathoffset);
+}
+
+int main(int argc, char *argv[])
+{
+	void *fdt;
+	int err;
+
+	test_init(argc, argv);
+	fdt = load_blob_arg(argc, argv);
+
+	check_path(fdt, "/subnode@1");
+	check_path(fdt, "/subnode@2");
+	check_path(fdt, "/subnode@1/subsubnode");
+	check_path(fdt, "/subnode@2/subsubnode@0");
+	err = fdt_parent_offset(fdt, 0);
+	if (err != -FDT_ERR_NOTFOUND)
+		FAIL("fdt_parent_offset(/) returns %d instead of "
+		     "-FDT_ERR_NOTFOUND", err);
+
+	PASS();
+}