WebIDL: Use malloc/strcpy on Struct String setters, fix libass#77

build/webidl_binder.py

@@ -2,6 +2,7 @@
 ## Patched to: 
 ##   - add integer pointers (IntPtr)
 ##   - implement ByteString type
+##   - fix string setter for structs
 ## From https://github.com/emscripten-core/emscripten/blob/f36f9fcaf83db93e6a6d0f0cdc47ab6379ade139/tools/webidl_binder.py
 
 # Copyright 2014 The Emscripten Authors.  All rights reserved.
@@ -723,7 +724,12 @@ def render_function(class_name, func_name, sigs, return_type, non_pointer,
       get_sigs = {0: []}
       set_sigs = {1: [Dummy({'type': m.type})]}
       get_call_content = take_addr_if_nonpointer(m) + 'self->' + attr
-      set_call_content = 'self->' + attr + ' = ' + deref_if_nonpointer(m) + 'arg0'
+      if m.type.isDOMString():
+        set_call_content = """char* copy = (char*)malloc(strlen(%s) + 1); 
+  strcpy(copy, %s);
+  self->%s = copy""" % (deref_if_nonpointer(m) + 'arg0', deref_if_nonpointer(m) + 'arg0', attr)
+      else:
+        set_call_content = 'self->' + attr + ' = ' + deref_if_nonpointer(m) + 'arg0'
 
     get_name = 'get_' + attr
     mid_js += [r'''