pylibfdt: add Property.as_stringlist()

Add a new method for decoding a string list property, useful for e.g.
the "reg-names" property.

Also add a test for the new method.

Signed-off-by: Luca Weiss <luca@z3ntu.xyz>
Message-Id: <20211225132558.167123-2-luca@z3ntu.xyz>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

pylibfdt/libfdt.i

@@ -724,6 +724,13 @@ class Property(bytearray):
             raise ValueError('Property contains embedded nul characters')
         return self[:-1].decode('utf-8')
 
+    def as_stringlist(self):
+        """Unicode is supported by decoding from UTF-8"""
+        if self[-1] != 0:
+            raise ValueError('Property lacks nul termination')
+        parts = self[:-1].split(b'\x00')
+        return list(map(lambda x: x.decode('utf-8'), parts))
+
 
 class FdtSw(FdtRo):
     """Software interface to create a device tree from scratch

tests/pylibfdt_tests.py

@@ -382,6 +382,14 @@ class PyLibfdtBasicTests(unittest.TestCase):
                           self.get_prop("prop-uint64").as_uint64())
         self.assertEqual(-2, self.get_prop("prop-int64").as_int64())
 
+    def testGetStringlistProperties(self):
+        """Test that we can access properties as string list"""
+        node = self.fdt.path_offset('/subnode@1/subsubnode')
+        self.assertEqual(["subsubnode1", "subsubnode"],
+                         self.fdt.getprop(node, "compatible").as_stringlist())
+        self.assertEqual(["this is a placeholder string", "string2"],
+                         self.fdt.getprop(node, "placeholder").as_stringlist())
+
     def testReserveMap(self):
         """Test that we can access the memory reserve map"""
         self.assertEqual(2, self.fdt.num_mem_rsv())