implement "lds" for objects (buffers, cin)

crsn_stdio/src/lib.rs

@@ -10,6 +10,7 @@ use std::convert::TryFrom;
 use std::io;
 use crsn::asm::instr::cond::Flag;
 use std::fmt;
+use crsn::asm::data::Wr;
 
 mod console {
     use std::{io};
@@ -244,4 +245,52 @@ impl CrsnExtension for StdioOps {
 
         Ok(None)
     }
+
+    /// Run-time method called to read all values from an object ("lds" using the object handle syntax)
+    fn read_obj_all(&self, state: &mut RunState, whandle: Wr, rhandle: Value)
+                    -> Result<Option<()>, Fault>
+    {
+        if rhandle == self.hdl_stdin {
+            loop {
+                match console::read_char() {
+                    Ok(c) => {
+                        state.write(whandle, c as Value)?;
+                    }
+                    Err(e) => {
+                        if e.kind() != io::ErrorKind::InvalidData {
+                            state.set_flag(Flag::Eof, true);
+                        } else {
+                            state.set_flag(Flag::Invalid, true);
+                        }
+                        return Ok(Some(()));
+                    }
+                }
+            }
+        }
+
+        if rhandle == self.hdl_stdin_raw {
+            loop {
+                match console::read_byte() {
+                    Ok(c) => {
+                        state.write(whandle, c as Value)?;
+                    }
+                    Err(e) => {
+                        if e.kind() != io::ErrorKind::InvalidData {
+                            state.set_flag(Flag::Eof, true);
+                        } else {
+                            state.set_flag(Flag::Invalid, true);
+                        }
+                        return Ok(Some(()));
+                    }
+                }
+            }
+        }
+
+        if rhandle == self.hdl_stdout || rhandle == self.hdl_stdout_raw {
+            state.set_flag(Flag::Invalid, true);
+            return Ok(Some(()));
+        }
+
+        Ok(None)
+    }
 }