scheme.rs 3.98 KB
Newer Older
Jeremy Soller's avatar
Jeremy Soller committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143
use std::cell::{Cell, RefCell};
use std::collections::BTreeMap;
use std::str;

use syscall::{Result, Error, EBADF, ENOENT, Scheme};

use display::Display;
use screen::TextScreen;

pub struct DisplayScheme {
    width: usize,
    height: usize,
    onscreen: usize,
    active: Cell<usize>,
    screens: RefCell<BTreeMap<usize, TextScreen>>
}

impl DisplayScheme {
    pub fn new(width: usize, height: usize, onscreen: usize) -> DisplayScheme {
        let mut screens = BTreeMap::new();
        for i in 1..7 {
            screens.insert(i, TextScreen::new(Display::new(width, height, onscreen)));
        }

        DisplayScheme {
            width: width,
            height: height,
            onscreen: onscreen,
            active: Cell::new(1),
            screens: RefCell::new(screens)
        }
    }

    pub fn will_block(&self, id: usize) -> bool {
        let screens = self.screens.borrow();
        if let Some(screen) = screens.get(&id) {
            screen.will_block()
        } else {
            false
        }
    }
}

impl Scheme for DisplayScheme {
    fn open(&self, path: &[u8], _flags: usize, _uid: u32, _gid: u32) -> Result<usize> {
        if path == b"input" {
            Ok(0)
        } else {
            let path_str = str::from_utf8(path).unwrap_or("");
            let id = path_str.parse::<usize>().unwrap_or(0);
            if self.screens.borrow().contains_key(&id) {
                Ok(id)
            } else {
                Err(Error::new(ENOENT))
            }
        }
    }

    fn dup(&self, id: usize) -> Result<usize> {
        Ok(id)
    }

    fn fevent(&self, id: usize, flags: usize) -> Result<usize> {
        let mut screens = self.screens.borrow_mut();
        if let Some(mut screen) = screens.get_mut(&id) {
            println!("fevent {:X}", flags);
            screen.requested = flags;
            Ok(0)
        } else {
            Err(Error::new(EBADF))
        }
    }

    fn fpath(&self, id: usize, buf: &mut [u8]) -> Result<usize> {
        let screens = self.screens.borrow();
        let path_str = if id == 0 {
            format!("display:input")
        } else if let Some(screen) = screens.get(&id) {
            format!("display:{}/{}/{}", id, screen.console.w, screen.console.h)
        } else {
            return Err(Error::new(EBADF));
        };

        let path = path_str.as_bytes();

        let mut i = 0;
        while i < buf.len() && i < path.len() {
            buf[i] = path[i];
            i += 1;
        }

        Ok(i)
    }

    fn fsync(&self, id: usize) -> Result<usize> {
        let mut screens = self.screens.borrow_mut();
        if let Some(mut screen) = screens.get_mut(&id) {
            if id == self.active.get() {
                screen.sync();
            }
            Ok(0)
        } else {
            Err(Error::new(EBADF))
        }
    }

    fn read(&self, id: usize, buf: &mut [u8]) -> Result<usize> {
        let mut screens = self.screens.borrow_mut();
        if let Some(mut screen) = screens.get_mut(&id) {
            screen.read(buf)
        } else {
            Err(Error::new(EBADF))
        }
    }

    fn write(&self, id: usize, buf: &[u8]) -> Result<usize> {
        let mut screens = self.screens.borrow_mut();
        if id == 0 {
            if buf.len() == 1 && buf[0] >= 0xF4 {
                let new_active = (buf[0] - 0xF4) as usize + 1;
                if let Some(mut screen) = screens.get_mut(&new_active) {
                    self.active.set(new_active);
                    screen.redraw();
                }
                Ok(1)
            } else {
                if let Some(mut screen) = screens.get_mut(&self.active.get()) {
                    screen.input(buf)
                } else {
                    Err(Error::new(EBADF))
                }
            }
        } else if let Some(mut screen) = screens.get_mut(&id) {
            screen.write(buf, id == self.active.get())
        } else {
            Err(Error::new(EBADF))
        }
    }

    fn close(&self, _id: usize) -> Result<usize> {
        Ok(0)
    }
}