Remove resource_sceme, Fix syscall crate name, add fmap

drivers/vesad/Cargo.toml

@@ -4,9 +4,9 @@ version = "0.1.0"
 
 [dependencies]
 orbclient = "0.1"
-ransid = { git = "https://github.com/redox-os/ransid.git" }
+ransid = "0.2"
 rusttype = { git = "https://github.com/dylanede/rusttype.git", optional = true }
-syscall = { path = "../../syscall/" }
+redox_syscall = "0.1"
 
 [features]
 default = []

drivers/vesad/src/scheme.rs

@@ -72,6 +72,14 @@ impl SchemeMut for DisplayScheme {
         }
     }
 
+    fn fmap(&mut self, id: usize, offset: usize, size: usize) -> Result<usize> {
+        if let Some(screen) = self.screens.get(&id) {
+            screen.map(offset, size)
+        } else {
+            Err(Error::new(EBADF))
+        }
+    }
+
     fn fpath(&mut self, id: usize, buf: &mut [u8]) -> Result<usize> {
         let path_str = if id == 0 {
             format!("display:input")

drivers/vesad/src/screen/graphic.rs

@@ -45,6 +45,14 @@ impl Screen for GraphicScreen {
         Ok(0)
     }
 
+    fn map(&self, offset: usize, size: usize) -> Result<usize> {
+        if offset + size <= self.display.offscreen.len() * 4 {
+            Ok(self.display.offscreen.as_ptr() as usize + offset)
+        } else {
+            Err(Error::new(EINVAL))
+        }
+    }
+
     fn input(&mut self, event: &Event) {
         if let EventOption::Mouse(mut mouse_event) = event.to_option() {
             let x = cmp::max(0, cmp::min(self.display.width as i32, self.mouse_x + mouse_event.x));

drivers/vesad/src/screen/mod.rs

@@ -14,6 +14,8 @@ pub trait Screen {
 
     fn event(&mut self, flags: usize) -> Result<usize>;
 
+    fn map(&self, offset: usize, size: usize) -> Result<usize>;
+
     fn input(&mut self, event: &Event);
 
     fn read(&mut self, buf: &mut [u8]) -> Result<usize>;

drivers/vesad/src/screen/text.rs

@@ -3,7 +3,7 @@ extern crate ransid;
 use std::collections::{BTreeSet, VecDeque};
 
 use orbclient::{Event, EventOption};
-use syscall::Result;
+use syscall::error::*;
 
 use display::Display;
 use screen::Screen;
@@ -48,6 +48,10 @@ impl Screen for TextScreen {
         Ok(0)
     }
 
+    fn map(&self, offset: usize, size: usize) -> Result<usize> {
+        Err(Error::new(EBADF))
+    }
+
     fn input(&mut self, event: &Event) {
         let mut buf = vec![];