46 lines
1.1 KiB
Rust
46 lines
1.1 KiB
Rust
use super::File;
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use crate::drivers::chardev::CharDevice;
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use crate::drivers::chardev::UART;
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use crate::mm::UserBuffer;
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pub struct Stdin;
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pub struct Stdout;
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impl File for Stdin {
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fn readable(&self) -> bool {
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true
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}
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fn writable(&self) -> bool {
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false
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}
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fn read(&self, mut user_buf: UserBuffer) -> usize {
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assert_eq!(user_buf.len(), 1);
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//println!("before UART.read() in Stdin::read()");
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let ch = UART.read();
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unsafe {
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user_buf.buffers[0].as_mut_ptr().write_volatile(ch);
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}
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1
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}
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fn write(&self, _user_buf: UserBuffer) -> usize {
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panic!("Cannot write to stdin!");
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}
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}
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impl File for Stdout {
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fn readable(&self) -> bool {
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false
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}
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fn writable(&self) -> bool {
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true
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}
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fn read(&self, _user_buf: UserBuffer) -> usize {
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panic!("Cannot read from stdout!");
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}
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fn write(&self, user_buf: UserBuffer) -> usize {
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for buffer in user_buf.buffers.iter() {
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print!("{}", core::str::from_utf8(*buffer).unwrap());
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}
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user_buf.len()
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}
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}
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