3 files changed, 29 insertions, 8 deletions

diff --git a/libjava/java/io/BufferedReader.java b/libjava/java/io/BufferedReader.java
index 73fb47c..e29c8dd 100644
--- a/libjava/java/io/BufferedReader.java
+++ b/libjava/java/io/BufferedReader.java
@@ -460,12 +460,19 @@ public class BufferedReader extends Reader
     boolean eof = false;
     for (;;)
       {
-	int ch = read();
-	if (ch < 0)
+	// readLine should block. So we must not return until a -1 is reached.
+	if (pos >= limit)
 	  {
-	    eof = true;
-	    break;
+	    // here count == 0 isn't sufficient to give a failure.
+	    int count = fill();
+	    if (count < 0)
+	      {
+		eof = true;
+		break;
+	      }
+	    continue;
 	  }
+	int ch = buffer[pos++];
 	if (ch == '\n' || ch == '\r')
 	  {
 	    // Check here if a '\r' was the last char in the buffer; if so,
diff --git a/libjava/java/io/CharArrayReader.java b/libjava/java/io/CharArrayReader.java
index f379519..9d5382b 100644
--- a/libjava/java/io/CharArrayReader.java
+++ b/libjava/java/io/CharArrayReader.java
@@ -228,7 +228,7 @@ public class CharArrayReader extends Reader
 
 	/* Don't need to check pos value, arraycopy will check it. */
 	if (off < 0 || len < 0 || off + len > b.length)
-	  throw new ArrayIndexOutOfBoundsException();
+	  throw new IndexOutOfBoundsException();
 
 	if (pos >= count)
 	  return -1;
diff --git a/libjava/java/io/LineNumberReader.java b/libjava/java/io/LineNumberReader.java
index 9c4796d..439a760 100644
--- a/libjava/java/io/LineNumberReader.java
+++ b/libjava/java/io/LineNumberReader.java
@@ -155,6 +155,9 @@ public class LineNumberReader extends BufferedReader
     */
   public void mark(int readLimit) throws IOException
   {
+    if (readLimit < 0)
+      throw new IllegalArgumentException("Read-ahead limit is negative");
+
     synchronized (lock)
       {
 	// This is basically the same as BufferedReader.mark.
@@ -265,9 +268,17 @@ public class LineNumberReader extends BufferedReader
     * @return The actual number of chars read, or -1 if end of stream
     *
     * @exception IOException If an error occurs.
+    * @exception NullPointerException If buf is null (in any case).
+    * @exception IndexOutOfBoundsException If buffer parameters (offset and
+    * count) lies outside of the buffer capacity.
     */
   public int read(char[] buf, int offset, int count) throws IOException
   {
+    if (buf == null)
+      throw new NullPointerException();
+    if (offset + count > buf.length || offset < 0)
+      throw new IndexOutOfBoundsException();
+
     if (count <= 0)
       {
 	if (count < 0)
@@ -376,14 +387,17 @@ public class LineNumberReader extends BufferedReader
     */
   public long skip (long count) throws IOException
   {
-    if (count <= 0)
+    if (count < 0)
+      throw new IllegalArgumentException("skip() value is negative");
+    if (count == 0)
       return 0;
 
     int skipped;
-    
+    char[] buf = new char[1];
+   
     for (skipped = 0; skipped < count; skipped++)
       {
-        int ch = read();
+        int ch = read(buf, 0, 1);
 
         if (ch < 0)
           break;