45 lines
1.1 KiB
Rust
45 lines
1.1 KiB
Rust
extern crate libc;
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extern crate melib;
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use melib::Envelope;
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use std::ffi::CString;
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use std::os::raw::c_char;
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#[no_mangle]
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pub extern "C" fn print_envelope(ptr: *const Envelope) -> *const c_char {
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unsafe {
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assert!(!ptr.is_null(), "Null pointer in print_envelope");
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//println!("got addr {}", p as u64);
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//unsafe { CString::new("blah".to_string()).unwrap().as_ptr() }
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let s = CString::new(format!("{:?}", *ptr)).unwrap();
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drop(ptr);
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let p = s.as_ptr();
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std::mem::forget(s);
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p
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}
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}
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#[no_mangle]
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pub extern "C" fn get_empty_envelope() -> *mut Envelope {
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let mut ret = Envelope::default();
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let ptr = std::ptr::NonNull::new(&mut ret as *mut Envelope)
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.expect("Envelope::default() has a NULL pointer?");
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let ptr = ptr.as_ptr();
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std::mem::forget(ret);
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ptr
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}
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#[no_mangle]
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pub extern "C" fn destroy_cstring(ptr: *mut c_char) {
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unsafe {
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let slice = CString::from_raw(ptr);
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drop(slice);
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}
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}
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#[no_mangle]
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pub extern "C" fn envelope_size() -> libc::size_t {
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std::mem::size_of::<Envelope>()
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}
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