29 lines
658 B
Rust
29 lines
658 B
Rust
#![crate_name = "externcallback"]
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#![crate_type = "lib"]
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#![feature(rustc_private)]
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extern crate libc;
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pub mod rustrt {
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extern crate libc;
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#[link(name = "rust_test_helpers", kind = "static")]
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extern "C" {
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pub fn rust_dbg_call(
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cb: extern "C" fn(libc::uintptr_t) -> libc::uintptr_t,
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data: libc::uintptr_t,
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) -> libc::uintptr_t;
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}
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}
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pub fn fact(n: libc::uintptr_t) -> libc::uintptr_t {
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unsafe {
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println!("n = {}", n);
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rustrt::rust_dbg_call(cb, n)
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}
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}
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pub extern "C" fn cb(data: libc::uintptr_t) -> libc::uintptr_t {
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if data == 1 { data } else { fact(data - 1) * data }
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}
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