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// Copyright 2013 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.
use either::*;
use libc;
use str::StrSlice;
pub trait Logger {
fn log(&mut self, msg: Either<~str, &'static str>);
}
pub struct StdErrLogger;
impl Logger for StdErrLogger {
fn log(&mut self, msg: Either<~str, &'static str>) {
use io::{Writer, WriterUtil};
if !should_log_console() {
return;
}
let s: &str = match msg {
Left(ref s) => {
let s: &str = *s;
s
}
Right(ref s) => {
let s: &str = *s;
s
}
};
// Truncate the string
let buf_bytes = 2048;
if s.len() > buf_bytes {
let s = s.slice(0, buf_bytes) + "[...]";
print(s);
} else {
print(s)
};
fn print(s: &str) {
let dbg = ::libc::STDERR_FILENO as ::io::fd_t;
dbg.write_str(s);
dbg.write_str("\n");
dbg.flush();
}
}
}
/// Configure logging by traversing the crate map and setting the
/// per-module global logging flags based on the logging spec
#[fixed_stack_segment] #[inline(never)]
pub fn init(crate_map: *u8) {
use c_str::ToCStr;
use os;
use ptr;
use option::{Some, None};
let log_spec = os::getenv("RUST_LOG");
match log_spec {
Some(spec) => {
do spec.with_c_str |buf| {
unsafe { rust_update_log_settings(crate_map, buf) }
}
}
None => {
unsafe {
rust_update_log_settings(crate_map, ptr::null());
}
}
}
}
#[fixed_stack_segment] #[inline(never)]
pub fn console_on() { unsafe { rust_log_console_on() } }
#[fixed_stack_segment] #[inline(never)]
pub fn console_off() { unsafe { rust_log_console_off() } }
#[fixed_stack_segment] #[inline(never)]
fn should_log_console() -> bool { unsafe { rust_should_log_console() != 0 } }
extern {
fn rust_update_log_settings(crate_map: *u8, settings: *libc::c_char);
fn rust_log_console_on();
fn rust_log_console_off();
fn rust_should_log_console() -> libc::uintptr_t;
}
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