//
// class to read lines from standard input without using the
//      BufferedReader class, which apparently does not work well
//      under Windows.
//
// LineInput.readLine() returns a string containing a line from
//      standard input (up to line feed / carriage return).  
//      it returns null on end of file.  compare with CIS3020 Input
//      class, which throws an exception on end of file.
//
// see main method for example of use.

import java.io.*;

public class LineInput {

        // make a reader for standard input (System.in).

        static Reader br = new InputStreamReader(System.in) ;

        static String readLine() {

                try {

                StringBuffer sb = new StringBuffer() ;
                int ich = br.read() ;
                char ch = (char) ich ;
                if (ich == -1) {
                        return null ;
                }
                else {  // at least one character has been read
                        while (ch != '\n' && ch != '\r' && ich != -1) {
                                sb.append(ch) ;
                                ich = br.read() ;
                                ch = (char) ich ;
                        }
                        return sb.toString() ;
                }

                } // end of 'try'

                catch (IOException e) {
                        // don't really expect this to happen, so
                        //      just end the program
                        throw new RuntimeException("I/O error!") ;
                }
        }

        // main method (demonstrates use)

        public static void main(String[] args) {

                String s ;
                System.out.println("Enter lines to echo:") ;

                do {
                        s = LineInput.readLine() ;
                        if (s != null) 
                                System.out.println("Read:  " + s) ;
                } while (s != null) ;

                System.out.println("That's all, folks!") ;
        }
}