py api - added PyC_UnicodeFromByteAndSize() to match PyUnicode_FromStringAndSize()

also made RNA_property_string_get_alloc() return the length of the new string to avoid having to run strlen on it after.

source/blender/python/generic/IDProp.c

@@ -67,9 +67,9 @@ PyObject *BPy_IDGroup_WrapData( ID *id, IDProperty *prop )
 	switch ( prop->type ) {
 		case IDP_STRING:
 #ifdef USE_STRING_COERCE
-			return PyC_UnicodeFromByte(IDP_Array(prop));
+            return PyC_UnicodeFromByteAndSize(IDP_Array(prop), prop->len);
 #else
-			return PyUnicode_FromString(IDP_Array(prop));
+            return PyUnicode_FromStringAndSize(IDP_Array(prop), prop->len);
 #endif
 		case IDP_INT:
 			return PyLong_FromLong( (long)prop->data.val );
@@ -485,9 +485,9 @@ static PyObject *BPy_IDGroup_MapDataToPy(IDProperty *prop)
 	switch (prop->type) {
 		case IDP_STRING:
 #ifdef USE_STRING_COERCE
-			return PyC_UnicodeFromByte(IDP_Array(prop));
+            return PyC_UnicodeFromByteAndSize(IDP_Array(prop), prop->len);
 #else
-			return PyUnicode_FromString(IDP_Array(prop));
+            return PyUnicode_FromStringAndSize(IDP_Array(prop), prop->len);
 #endif
 			break;
 		case IDP_FLOAT:

source/blender/python/generic/py_capi_utils.c

@@ -386,9 +386,9 @@ const char *PyC_UnicodeAsByte(PyObject *py_str, PyObject **coerce)
 	}
 }
 
-PyObject *PyC_UnicodeFromByte(const char *str)
+PyObject *PyC_UnicodeFromByteAndSize(const char *str, Py_ssize_t size)
 {
-	PyObject *result= PyUnicode_FromString(str);
+    PyObject *result= PyUnicode_FromStringAndSize(str, size);
 	if (result) {
 		/* 99% of the time this is enough but we better support non unicode
 		 * chars since blender doesnt limit this */
@@ -397,11 +397,16 @@ PyObject *PyC_UnicodeFromByte(const char *str)
 	else {
 		PyErr_Clear();
 		/* this means paths will always be accessible once converted, on all OS's */
-		result= PyUnicode_DecodeFSDefault(str);
+		result= PyUnicode_DecodeFSDefaultAndSize(str, size);
 		return result;
 	}
 }
 
+PyObject *PyC_UnicodeFromByte(const char *str)
+{
+	return PyC_UnicodeFromByteAndSize(str, strlen(str));
+}
+
 /*****************************************************************************
 * Description: This function creates a new Python dictionary object.
 * note: dict is owned by sys.modules["__main__"] module, reference is borrowed

source/blender/python/generic/py_capi_utils.h

@@ -40,8 +40,9 @@ void			PyC_FileAndNum_Safe(const char **filename, int *lineno); /* checks python
 int				PyC_AsArray(void *array, PyObject *value, const int length, const PyTypeObject *type, const short is_double, const char *error_prefix);
 
 /* follow http://www.python.org/dev/peps/pep-0383/ */
-PyObject *		PyC_UnicodeFromByte(const char *str);
-const char *	PyC_UnicodeAsByte(PyObject *py_str, PyObject **coerce); /* coerce must be NULL */
+PyObject *      PyC_UnicodeFromByte(const char *str);
+PyObject *      PyC_UnicodeFromByteAndSize(const char *str, Py_ssize_t size);
+const char *    PyC_UnicodeAsByte(PyObject *py_str, PyObject **coerce); /* coerce must be NULL */
 
 /* name namespace function for bpy & bge */
 PyObject *		PyC_DefaultNameSpace(const char *filename);