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Allow multiple tinyalloc heaps (eliminate static variables) #14

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Multiple heaps can be useful for isolating memory into multiple areas
that can be used for different purposes, with individual limits.

  • Add a config struct (ta_cfg_t, can be declared const)
  • Pass config pointer to all tinyalloc functions

Depends on #13.

- Optionally set errno to ENOMEM when out of memory
- Optionally use memset() to implement memclear()
- Optionally use memcpy() to implement memcopy()
Multiple heaps can be useful for dividing memory into multiple areas
that can be used for different purposes, with individual limits.

- Add a config struct (ta_cfg_t, can be declared const)
- Pass config pointer to all tinyalloc functions
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