rust/src/libcore/logging.rs

// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

//! Logging

pub mod rustrt {
    use libc;

    pub extern {
        unsafe fn rust_log_console_on();
        unsafe fn rust_log_console_off();
        unsafe fn rust_log_str(level: u32,
                               string: *libc::c_char,
                               size: libc::size_t);
    }
}

/// Turns on logging to stdout globally
pub fn console_on() {
    unsafe {
        rustrt::rust_log_console_on();
    }
}

/**
 * Turns off logging to stdout globally
 *
 * Turns off the console unless the user has overridden the
 * runtime environment's logging spec, e.g. by setting
 * the RUST_LOG environment variable
 */
pub fn console_off() {
    unsafe {
        rustrt::rust_log_console_off();
    }
}

#[cfg(not(test))]
#[lang="log_type"]
pub fn log_type<T>(level: u32, object: &T) {
    use cast::transmute;
    use io;
    use libc;
    use repr;
    use vec;

    let bytes = do io::with_bytes_writer |writer| {
        repr::write_repr(writer, object);
    };
    unsafe {
        let len = bytes.len() as libc::size_t;
        rustrt::rust_log_str(level, transmute(vec::raw::to_ptr(bytes)), len);
    }
}