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// Copyright 2012-2013 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.
//! Global storage for command line arguments
//!
//! The current incarnation of the Rust runtime expects for
//! the processes `argc` and `argv` arguments to be stored
//! in a globally-accessible location for use by the `os` module.
//!
//! XXX: Would be nice for this to not exist.
//! XXX: This has a lot of C glue for lack of globals.
use libc;
use option::{Option, Some, None};
use str;
use uint;
use unstable::finally::Finally;
use util;
/// One-time global initialization.
pub unsafe fn init(argc: int, argv: **u8) {
let args = load_argc_and_argv(argc, argv);
put(args);
}
/// One-time global cleanup.
pub fn cleanup() {
rtassert!(take().is_some());
}
/// Take the global arguments from global storage.
pub fn take() -> Option<~[~str]> {
with_lock(|| unsafe {
let ptr = get_global_ptr();
let val = util::replace(&mut *ptr, None);
val.map(|s: &~~[~str]| (**s).clone())
})
}
/// Give the global arguments to global storage.
///
/// It is an error if the arguments already exist.
pub fn put(args: ~[~str]) {
with_lock(|| unsafe {
let ptr = get_global_ptr();
rtassert!((*ptr).is_none());
(*ptr) = Some(~args.clone());
})
}
/// Make a clone of the global arguments.
pub fn clone() -> Option<~[~str]> {
with_lock(|| unsafe {
let ptr = get_global_ptr();
(*ptr).map(|s: &~~[~str]| (**s).clone())
})
}
fn with_lock<T>(f: &fn() -> T) -> T {
do (|| {
unsafe {
rust_take_global_args_lock();
f()
}
}).finally {
unsafe {
rust_drop_global_args_lock();
}
}
}
fn get_global_ptr() -> *mut Option<~~[~str]> {
unsafe { rust_get_global_args_ptr() }
}
// Copied from `os`.
unsafe fn load_argc_and_argv(argc: int, argv: **u8) -> ~[~str] {
let mut args = ~[];
for uint::range(0, argc as uint) |i| {
args.push(str::raw::from_c_str(*(argv as **libc::c_char).offset(i)));
}
return args;
}
extern {
fn rust_take_global_args_lock();
fn rust_drop_global_args_lock();
fn rust_get_global_args_ptr() -> *mut Option<~~[~str]>;
}
#[cfg(test)]
mod tests {
use option::{Some, None};
use super::*;
use unstable::finally::Finally;
#[test]
fn smoke_test() {
// Preserve the actual global state.
let saved_value = take();
let expected = ~[~"happy", ~"today?"];
put(expected.clone());
assert!(clone() == Some(expected.clone()));
assert!(take() == Some(expected.clone()));
assert!(take() == None);
do (|| {
}).finally {
// Restore the actual global state.
match saved_value {
Some(ref args) => put(args.clone()),
None => ()
}
}
}
}
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