tests: Add check_path test

Add a test that checks for existence or not of a node.
It is useful for testing the various cases when generating
symbols and fixups for dynamic device tree objects.

Signed-off-by: Pantelis Antoniou <pantelis.antoniou@konsulko.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

tests/.gitignore

@@ -8,6 +8,7 @@ tmp.*
 /asm_tree_dump
 /boot-cpuid
 /char_literal
+/check_path
 /del_node
 /del_property
 /dtbs_equal_ordered

tests/Makefile.tests

@@ -25,7 +25,8 @@ LIB_TESTS_L = get_mem_rsv \
 	integer-expressions \
 	property_iterate \
 	subnode_iterate \
-	overlay overlay_bad_fixup
+	overlay overlay_bad_fixup \
+	check_path
 LIB_TESTS = $(LIB_TESTS_L:%=$(TESTS_PREFIX)%)
 
 LIBTREE_TESTS_L = truncated_property

tests/check_path.c

@@ -0,0 +1,82 @@
+/*
+ * libfdt - Flat Device Tree manipulation
+ *	Testcase for node existence
+ * Copyright (C) 2016 Konsulko Inc.
+ *
+ * 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
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * 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 <stdio.h>
+
+#include <libfdt.h>
+
+#include "tests.h"
+
+#define CHECK(code) \
+	{ \
+		if (code) \
+			FAIL(#code ": %s", fdt_strerror(code)); \
+	}
+
+/* 4k ought to be enough for anybody */
+#define FDT_COPY_SIZE	(4 * 1024)
+
+static void *open_dt(char *path)
+{
+	void *dt, *copy;
+
+	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));
+
+	return copy;
+}
+
+int main(int argc, char *argv[])
+{
+	void *fdt_base;
+	int fail_config, exists, check_exists;
+
+	test_init(argc, argv);
+	fail_config = 0;
+
+	if (argc != 4)
+		fail_config = 1;
+
+	if (!fail_config) {
+		if (!strcmp(argv[2], "exists"))
+			check_exists = 1;
+		else if (!strcmp(argv[2], "not-exists"))
+			check_exists = 0;
+		else
+			fail_config = 1;
+	}
+
+	if (fail_config)
+		CONFIG("Usage: %s <base dtb> <[exists|not-exists]> <node-path>", argv[0]);
+
+	fdt_base = open_dt(argv[1]);
+
+	exists = fdt_path_offset(fdt_base, argv[3]) >= 0;
+
+	if (exists == check_exists)
+		PASS();
+	else
+		FAIL();
+}

tests/run_tests.sh

@@ -508,6 +508,9 @@ dtc_tests () {
     run_sh_test dtc-checkfails.sh duplicate_label -- -I dts -O dtb reuse-label5.dts
     run_sh_test dtc-checkfails.sh duplicate_label -- -I dts -O dtb reuse-label6.dts
 
+    run_test check_path test_tree1.dtb exists "/subnode@1"
+    run_test check_path test_tree1.dtb not-exists "/subnode@10"
+
     # Check warning options
     run_sh_test dtc-checkfails.sh address_cells_is_cell interrupt_cells_is_cell -n size_cells_is_cell -- -Wno_size_cells_is_cell -I dts -O dtb bad-ncells.dts
     run_sh_test dtc-fails.sh -n test-warn-output.test.dtb -I dts -O dtb bad-ncells.dts