The C ABI for libasdf, implemented in Rust.

This crate is a thin projection of [asdf_core] onto libasdf's exported C interface. It holds no behaviour of its own: everything here converts between C representations and the engine's, and every entry point is wrapped so that a panic can never unwind into a C caller.

What lives here versus in C

Almost all of the ABI is expressed directly in Rust. Two things cannot be, and live in shim.c instead:

• the three variadic entry points (asdf_file_log, asdf_file_error_common, asdf_value_error_common), because defining variadic extern "C" functions needs unstable Rust; and
• asdf_ndarray_read_float16_at, because _Float16 is unstable and its return ABI differs from uint16_t's.

Headers

The public headers are vendored verbatim from upstream rather than generated, because several API entry points exist only as _Generic macros or static inline functions. See include/PROVENANCE.md.