For the memory allocation purposes,
the programmer must use the following allocator interface
which is prototyped in lib/lib.h (see Main project header).
The functions are protected against low memory resulting in process abort on failure
and having the same meaning as the original without the x prepended.
We mention functions like xmalloc, xfree, xrealloc, etc.,
consult lib/lib.h for details.
There is also a “small” memory allocator, intended to be used when frequently allocating small memory pieces. See the lib/smalloc.h header for interface. The implementation is in lib/smalloc.c.