RandomAccessFile.java (seek): Let seek go past end of file.

	* java/io/RandomAccessFile.java (seek): Let seek go past end of
	file.
	(skipBytes): Don't fail if seeking past end of file.
	* java/io/FileInputStream.java (skip): Don't fail if seeking past
	end of file.
	* java/io/natFileDescriptorWin32.cc (seek): Handle `eof_trunc'
	argument.
	* java/io/natFileDescriptorEcos.cc (seek): Handle `eof_trunc'
	argument.
	* java/io/natFileDescriptorPosix.cc (seek): Handle `eof_trunc'
	argument.
	* java/io/FileDescriptor.java (seek): Added `eof_trunc' argument.

From-SVN: r44586

6 files changed, 28 insertions, 23 deletions

diff --git a/libjava/java/io/FileDescriptor.java b/libjava/java/io/FileDescriptor.java
index 493f14c..8afcda4 100644
--- a/libjava/java/io/FileDescriptor.java
+++ b/libjava/java/io/FileDescriptor.java
@@ -1,6 +1,6 @@
 // FileDescriptor.java - Open file or device
 
-/* Copyright (C) 1998, 1999, 2000  Free Software Foundation
+/* Copyright (C) 1998, 1999, 2000, 2001  Free Software Foundation
 
    This file is part of libgcj.
 
@@ -54,7 +54,11 @@ public final class FileDescriptor
   native void write (byte[] b, int offset, int len)
     throws IOException, NullPointerException, IndexOutOfBoundsException;
   native void close () throws IOException;
-  native int seek (long pos, int whence) throws IOException;
+  // EOF_TRUNC is true if a request to seek past the end of file
+  // should actually stop at the end of file.  If false, then a seek
+  // past the end is ok (and if a subsequent write occurs the file
+  // will grow).
+  native int seek (long pos, int whence, boolean eof_trunc) throws IOException;
   native long length () throws IOException;
   native long getFilePointer () throws IOException;
   native int read () throws IOException;
diff --git a/libjava/java/io/FileInputStream.java b/libjava/java/io/FileInputStream.java
index 67d4842..9d0d013 100644
--- a/libjava/java/io/FileInputStream.java
+++ b/libjava/java/io/FileInputStream.java
@@ -1,4 +1,4 @@
-/* Copyright (C) 1998, 1999  Free Software Foundation
+/* Copyright (C) 1998, 1999, 2001  Free Software Foundation
 
    This file is part of libgcj.
 
@@ -88,6 +88,6 @@ public class FileInputStream extends InputStream
 
   public long skip(long n) throws IOException
   {
-    return fd.seek(n, FileDescriptor.CUR);
+    return n <= 0 ? 0 : fd.seek(n, FileDescriptor.CUR, true);
   }
 }
diff --git a/libjava/java/io/RandomAccessFile.java b/libjava/java/io/RandomAccessFile.java
index 9a0bf80..418974c 100644
--- a/libjava/java/io/RandomAccessFile.java
+++ b/libjava/java/io/RandomAccessFile.java
@@ -1,6 +1,6 @@
 // RandomAccessFile.java
 
-/* Copyright (C) 1998, 1999  Free Software Foundation
+/* Copyright (C) 1998, 1999, 2001  Free Software Foundation
 
    This file is part of libgcj.
 
@@ -161,12 +161,12 @@ public class RandomAccessFile implements DataOutput, DataInput
 
   public void seek (long pos) throws IOException
   {
-    fd.seek(pos, FileDescriptor.SET);
+    fd.seek(pos, FileDescriptor.SET, false);
   }
 
   public int skipBytes (int count) throws IOException
   {
-    return fd.seek(count, FileDescriptor.CUR);
+    return count <= 0 ? 0 : fd.seek(count, FileDescriptor.CUR, true);
   }
 
   public void write (int oneByte) throws IOException
diff --git a/libjava/java/io/natFileDescriptorEcos.cc b/libjava/java/io/natFileDescriptorEcos.cc
index 43574df..a66bf73 100644
--- a/libjava/java/io/natFileDescriptorEcos.cc
+++ b/libjava/java/io/natFileDescriptorEcos.cc
@@ -1,6 +1,6 @@
 // natFileDescriptor.cc - Native part of FileDescriptor class.
 
-/* Copyright (C) 1998, 1999  Free Software Foundation
+/* Copyright (C) 1998, 1999, 2001  Free Software Foundation
 
    This file is part of libgcj.
 
@@ -88,16 +88,9 @@ java::io::FileDescriptor::close (void)
 }
 
 jint
-java::io::FileDescriptor::seek (jlong pos, jint whence)
+java::io::FileDescriptor::seek (jlong pos, jint whence, jboolean)
 {
   JvAssert (whence == SET || whence == CUR);
-
-  jlong len = length ();
-  jlong here = getFilePointer ();
-
-  if ((whence == SET && pos > len) || (whence == CUR && here + pos > len))
-    throw new EOFException;
-
   return 0;
 }
 
diff --git a/libjava/java/io/natFileDescriptorPosix.cc b/libjava/java/io/natFileDescriptorPosix.cc
index 4e05cfe..ad1c1cd 100644
--- a/libjava/java/io/natFileDescriptorPosix.cc
+++ b/libjava/java/io/natFileDescriptorPosix.cc
@@ -177,15 +177,19 @@ java::io::FileDescriptor::close (void)
 }
 
 jint
-java::io::FileDescriptor::seek (jlong pos, jint whence)
+java::io::FileDescriptor::seek (jlong pos, jint whence, jboolean eof_trunc)
 {
   JvAssert (whence == SET || whence == CUR);
 
   jlong len = length ();
   jlong here = getFilePointer ();
 
-  if ((whence == SET && pos > len) || (whence == CUR && here + pos > len))
-    throw new EOFException;
+  if (eof_trunc
+      && ((whence == SET && pos > len) || (whence == CUR && here + pos > len)))
+    {
+      whence = SET;
+      pos = len;
+    }
 
   off_t r = ::lseek (fd, (off_t) pos, whence == SET ? SEEK_SET : SEEK_CUR);
   if (r == -1)
diff --git a/libjava/java/io/natFileDescriptorWin32.cc b/libjava/java/io/natFileDescriptorWin32.cc
index 3f8ae76..c0e33e2 100644
--- a/libjava/java/io/natFileDescriptorWin32.cc
+++ b/libjava/java/io/natFileDescriptorWin32.cc
@@ -1,6 +1,6 @@
 // natFileDescriptorWin32.cc - Native part of FileDescriptor class.
 
-/* Copyright (C) 1998, 1999, 2000  Red Hat, Inc.
+/* Copyright (C) 1998, 1999, 2000, 2001  Red Hat, Inc.
 
    This file is part of libgcj.
 
@@ -171,15 +171,19 @@ java::io::FileDescriptor::close (void)
 }
 
 jint
-java::io::FileDescriptor::seek (jlong pos, jint whence)
+java::io::FileDescriptor::seek (jlong pos, jint whence, jboolean eof_trunc)
 {
   JvAssert (whence == SET || whence == CUR);
 
   jlong len = length();
   jlong here = getFilePointer();
 
-  if ((whence == SET && pos > len) || (whence == CUR && here + pos > len))
-    throw new EOFException;
+  if (eof_trunc
+      && ((whence == SET && pos > len) || (whence == CUR && here + pos > len)))
+    {
+      whence = SET;
+      pos = len;
+    }
 
   LONG high = pos >> 32;
   DWORD low = SetFilePointer ((HANDLE)fd, (DWORD)(0xffffffff & pos), &high, whence == SET ? FILE_BEGIN : FILE_CURRENT);