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Here are functions that provide information on the current status of allocation in an obstack. You can use them to learn about an object while still growing it.
If no object is growing, this value says where the next object you allocate will start (once again assuming it fits in the current chunk).
obstack_next_freereturns the same value as
obstack_next_free (obstack-ptr) - obstack_base (obstack-ptr)
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