Claude (dbsp-circuit)
0755222562
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01VdfEGXA7aJ6ftMsCc9PJze
64 lines
2.4 KiB
Rust
64 lines
2.4 KiB
Rust
//! The built shared library, loaded the way a CFFI caller loads it.
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//! Evidence: `context/test-evidence/zset-ffi.md`.
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use libloading::{Library, Symbol};
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use std::path::PathBuf;
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use std::ptr::null_mut;
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type Opaque = std::ffi::c_void;
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/// Cargo puts the cdylib in `target/<profile>/deps` beside this test binary's own directory.
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fn library() -> PathBuf {
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let exe = std::env::current_exe().unwrap();
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let deps = exe.parent().unwrap();
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let ext = if cfg!(target_os = "macos") {
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"dylib"
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} else {
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"so"
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};
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let name = format!("{}zset_ffi.{ext}", if cfg!(windows) { "" } else { "lib" });
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[deps.join(&name), deps.parent().unwrap().join(&name)]
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.into_iter()
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.find(|p| p.exists())
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.unwrap_or_else(|| panic!("{name} was not built next to {}", deps.display()))
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}
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#[test]
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fn a_loaded_library_adds_queries_frees_and_reports_overflow() {
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// SAFETY: loads this workspace's own library; the symbols below have the header's types.
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unsafe {
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let lib = Library::new(library()).unwrap();
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let version: Symbol<extern "C" fn() -> u32> = lib.get(b"zs_abi_version").unwrap();
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let new: Symbol<extern "C" fn(*mut *mut Opaque) -> i32> = lib.get(b"zs_zset_new").unwrap();
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let free: Symbol<extern "C" fn(*mut Opaque)> = lib.get(b"zs_zset_free").unwrap();
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let insert: Symbol<extern "C" fn(*mut Opaque, *const u8, usize, i64) -> i32> =
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lib.get(b"zs_zset_insert").unwrap();
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let weight: Symbol<extern "C" fn(*const Opaque, *const u8, usize, *mut i64) -> i32> =
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lib.get(b"zs_zset_weight").unwrap();
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let last: Symbol<extern "C" fn() -> *const std::ffi::c_char> =
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lib.get(b"zs_last_error").unwrap();
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assert_eq!(version(), 1);
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let mut z = null_mut();
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assert_eq!(new(&mut z), 0);
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assert_eq!(insert(z, b"k".as_ptr(), 1, 40), 0);
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assert_eq!(insert(z, b"k".as_ptr(), 1, 2), 0);
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let mut w = 0;
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assert_eq!(weight(z, b"k".as_ptr(), 1, &mut w), 0);
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assert_eq!(w, 42);
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assert_eq!(
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insert(z, b"k".as_ptr(), 1, i64::MAX),
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2,
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"overflow is ZS_ERR_OVERFLOW"
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);
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assert!(
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std::ffi::CStr::from_ptr(last())
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.to_str()
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.unwrap()
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.contains("overflow")
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);
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assert_eq!(weight(z, b"k".as_ptr(), 1, &mut w), 0);
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assert_eq!(w, 42, "the failed insert changed nothing");
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free(z);
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}
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}
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