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* buf.c (make_duplicate_buf, buf_get, buf_fill): New
functions.
* buf.h (make_duplicate_buf, buf_get, buf_fill): Declared.
* ffi.c (struct txr_ffi_type): New member, nelem.
Keeps track of number of elements, for types that are
FFI pointers. This lets us support the get method so that
a buf can be a C function return value, if its size is
declared in our FFI type system.
(ffi_buf_put, ffi_buf_get, ffi_buf_fill): New functions.
(ffi_type_compile): Handle two new cases of syntax for
buffers: (buf <size>) and buf.
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