Name: diC59631 Date: 05/20/98


io.LineNumberReader() does not work correctly for read().

The bottom stream of LineNumberReader() are '\r', '\n', and
when the coninued read are blocked, even if LineNumberReader#ready()
returns true after reading '\r' from the bottom stream,
LineNumberReader#read() is blocked.

Here is the repro TP. In case, represented the block of read as Error:

-------------------------
import java.io.*;

  public class TP extends Reader {
          int read = 0;

          public static void main(String[] args) throws IOException {
                  Reader in = new LineNumberReader(new TP());
                  System.out.println("Test Start");
                  System.out.println("in.ready() = " + in.ready());
                  System.out.println("in.read() = " + in.read());
                  System.out.println("in.ready() = " + in.ready());
                  System.out.println("in.read() = " + in.read());
          }

          public int read(char[] b, int off, int len) {
                  System.out.println("read(char[" + b.length + "], " + off + ", " + len + ") = 1");
                  if (read == 0) {
                          b[off] = '\r';
                  } else if (read == 1) {
                          b[off] = '\n';
                  } else if (read > 1) {
                          throw new Error("read");
                  }
                  read++;
                  return 1;
          }

          public void close() {
                  throw new Error("close");
          }

          public boolean ready() {
                 System.out.println("ready() = " + (read <= 1));
                  return (read <= 1);
          }
  }
-------------------------

When compiling and ruuning (JDK1.1.5) on WinNT4.0,
the outcome is:
----------------
Test Start
ready() = true
in.ready() = true
read(char[8192], 0, 8192) = 1
in.read() = 10
ready() = true
in.ready() = true
read(char[8192], 0, 8192) = 1
read(char[8192], 0, 8192) = 1
java.lang.Error: read
        at TP.read(TP.java:22)
        at java.io.BufferedReader.fill(BufferedReader.java:144)
        at java.io.BufferedReader.read(BufferedReader.java:161)
        at java.io.LineNumberReader.read(LineNumberReader.java:91)
        at TP.main(TP.java:12)
----------------
(Review ID: 30646)
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