What about obstack?

partial obstack support appeared in earlier versions of the LSB but the implementation was never complete. The partial bits were removed in the LSB 2.x timeframe. One comment at the time was: Obstacks are a memory management library built on top of malloc. As far as I know applications generally (always?) have their own copy of the obstack code, and don't have any particular need to use the glibc one. The complexity of obstacks are pretty horrendous considering the functionality is pretty simple. So to use obstacks in the LSB context, the best approach is to include the code directly into the application.