Jeremy Soller
63 lines
1.8 KiB
Rust
63 lines
1.8 KiB
Rust
use super::{BUFSIZ, Buffer, FILE, constants};
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use core::{cell::UnsafeCell, ptr};
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use crate::{
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fs::File,
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io::LineWriter,
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platform::types::*,
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sync::{Mutex, Once},
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};
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use alloc::{boxed::Box, vec::Vec};
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// TODO: Change FILE to allow const fn initialization?
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pub struct GlobalFile(UnsafeCell<FILE>);
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impl GlobalFile {
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fn new(file: c_int, flags: c_int) -> Self {
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let file = File::new(file);
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let writer = Box::new(LineWriter::new(unsafe { file.get_ref() }));
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GlobalFile(UnsafeCell::new(FILE {
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lock: Mutex::new(()),
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file,
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flags: constants::F_PERM | flags,
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read_buf: Buffer::Owned(vec![0; BUFSIZ as usize]),
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read_pos: 0,
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read_size: 0,
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unget: Vec::new(),
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writer,
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pid: None,
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orientation: 0,
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}))
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}
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pub fn get(&self) -> *mut FILE {
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self.0.get()
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}
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}
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// statics need to be Sync
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unsafe impl Sync for GlobalFile {}
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// TODO: Allow const fn initialization of FILE
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static DEFAULT_STDIN: Once<GlobalFile> = Once::new();
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static DEFAULT_STDOUT: Once<GlobalFile> = Once::new();
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static DEFAULT_STDERR: Once<GlobalFile> = Once::new();
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pub fn default_stdin() -> &'static GlobalFile {
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DEFAULT_STDIN.call_once(|| GlobalFile::new(0, constants::F_NOWR))
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}
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pub fn default_stdout() -> &'static GlobalFile {
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DEFAULT_STDOUT.call_once(|| GlobalFile::new(1, constants::F_NORD))
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}
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pub fn default_stderr() -> &'static GlobalFile {
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DEFAULT_STDERR.call_once(|| GlobalFile::new(2, constants::F_NORD))
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}
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#[unsafe(no_mangle)]
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pub static mut stdin: *mut FILE = ptr::null_mut();
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#[unsafe(no_mangle)]
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pub static mut stdout: *mut FILE = ptr::null_mut();
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#[unsafe(no_mangle)]
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pub static mut stderr: *mut FILE = ptr::null_mut();
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