/*
-@deftypefn Extension int vasprintf (char **@var{resptr}, char *@var{format}, va_list @var{args})
+@deftypefn Extension int vasprintf (char **@var{resptr}, const char *@var{format}, va_list @var{args})
Like @code{vsprintf}, but instead of passing a pointer to a buffer,
you pass a pointer to a pointer. This function will compute the size