Add Syscall: Exit, PutChar, GetCar, PutString, GetString

code/userprog/consoledriver.h

@@ -0,0 +1,25 @@
+#ifdef CHANGED
+#ifndef CONSOLEDRIVER_H
+#define CONSOLEDRIVER_H
+
+#include "copyright.h"
+#include "utility.h"
+#include "console.h"
+
+class ConsoleDriver:dontcopythis {
+  public:
+  // initialize the hardware console device
+    ConsoleDriver(const char *readFile, const char *writeFile);
+    
+    ~ConsoleDriver(); 		// clean up
+    
+    void PutChar(int ch);   // Behaves like putchar(3S)
+    int GetChar();			// Behaves like getchar(3S)
+    
+	void PutString(const char *s); // Behaves like fputs(3S)
+	void GetString(char *s, int n); // Behaves like fgets(3S)
+  private:
+	Console *console;
+};
+#endif // CONSOLEDRIVER_H
+#endif // CHANGED