XtVaCreateArgsList - dynamically allocate a varargs list
#include <X11/Intrinsic.h>
XtVarArgsList XtVaCreateArgsList(XtPointer unused,
  ...);
  - unused
- Must be specified as NULL.
- ...
- Specifies a variable parameter list of resource name and value pairs.
The XtVaCreateArgsList function allocates memory and copies its arguments
  into a single list pointer, which may be used with XtVaNestedList. The
  end of both lists is identified by a name entry containing NULL. Any
  entries of type XtVaTypedArg are copied as specified without applying
  conversions. Data passed by reference (including Strings) are not copied, only
  the pointers themselves; the caller must ensure that the data remain valid for
  the lifetime of the created varargs list. The list should be freed using
  XtFree when no longer needed.
X Toolkit Intrinsics - C Language Interface
Xlib - C Language X Interface