91 lines
2.5 KiB
Rust
91 lines
2.5 KiB
Rust
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// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use ffi::OsString;
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use marker::PhantomData;
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use mem;
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use vec;
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pub unsafe fn init(_argc: isize, _argv: *const *const u8) {
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// On wasm these should always be null, so there's nothing for us to do here
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}
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pub unsafe fn cleanup() {
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}
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pub fn args() -> Args {
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// When the runtime debugging is enabled we'll link to some extra runtime
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// functions to actually implement this. These are for now just implemented
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// in a node.js script but they're off by default as they're sort of weird
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// in a web-wasm world.
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if !super::DEBUG {
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return Args {
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iter: Vec::new().into_iter(),
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_dont_send_or_sync_me: PhantomData,
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}
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}
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// You'll find the definitions of these in `src/etc/wasm32-shim.js`. These
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// are just meant for debugging and should not be relied on.
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extern {
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fn rust_wasm_args_count() -> usize;
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fn rust_wasm_args_arg_size(a: usize) -> usize;
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fn rust_wasm_args_arg_fill(a: usize, ptr: *mut u8);
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}
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unsafe {
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let cnt = rust_wasm_args_count();
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let mut v = Vec::with_capacity(cnt);
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for i in 0..cnt {
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let n = rust_wasm_args_arg_size(i);
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let mut data = vec![0; n];
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rust_wasm_args_arg_fill(i, data.as_mut_ptr());
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v.push(mem::transmute::<Vec<u8>, OsString>(data));
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}
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Args {
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iter: v.into_iter(),
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_dont_send_or_sync_me: PhantomData,
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}
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}
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}
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pub struct Args {
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iter: vec::IntoIter<OsString>,
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_dont_send_or_sync_me: PhantomData<*mut ()>,
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}
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impl Args {
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pub fn inner_debug(&self) -> &[OsString] {
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self.iter.as_slice()
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}
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}
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impl Iterator for Args {
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type Item = OsString;
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fn next(&mut self) -> Option<OsString> {
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self.iter.next()
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}
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fn size_hint(&self) -> (usize, Option<usize>) {
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self.iter.size_hint()
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}
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}
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impl ExactSizeIterator for Args {
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fn len(&self) -> usize {
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self.iter.len()
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}
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}
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impl DoubleEndedIterator for Args {
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fn next_back(&mut self) -> Option<OsString> {
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self.iter.next_back()
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}
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}
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