// natFileDescriptor.cc - Native part of FileDescriptor class.

/* Copyright (C) 1998, 1999  Red Hat, Inc.

   This file is part of libgcj.

This software is copyrighted work licensed under the terms of the
Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
details.  */

#include <config.h>

#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/param.h>

#include <gcj/cni.h>
#include <jvm.h>
#include <java/io/FileDescriptor.h>
#include <java/io/SyncFailedException.h>
#include <java/io/IOException.h>
#include <java/io/EOFException.h>
#include <java/lang/ArrayIndexOutOfBoundsException.h>
#include <java/lang/NullPointerException.h>
#include <java/lang/String.h>
#include <java/io/FileNotFoundException.h>

extern "C" void diag_write_char (char c);

static void 
diag_write (char *data, int len)
{
  while (len > 0)
    {
      diag_write_char (*data++);
      len--;
    }
}

#define NO_FSYNC_MESSAGE "sync unsupported"

jboolean
java::io::FileDescriptor::valid (void)
{
  return true;
}

void
java::io::FileDescriptor::sync (void)
{
  // Some files don't support fsync.  We don't bother reporting these
  // as errors.
#ifdef HAVE_FSYNC
#else
  JvThrow (new SyncFailedException (JvNewStringLatin1 (NO_FSYNC_MESSAGE)));
#endif
}

jint
java::io::FileDescriptor::open (jstring path, jint jflags)
{
  return fd;
}

void
java::io::FileDescriptor::write (jint b)
{
  char d = (char) b;
  ::diag_write (&d, 1);
}

void
java::io::FileDescriptor::write (jbyteArray b, jint offset, jint len)
{
  if (! b)
    JvThrow (new java::lang::NullPointerException);
  if (offset < 0 || len < 0 || offset + len > JvGetArrayLength (b))
    JvThrow (new java::lang::ArrayIndexOutOfBoundsException);
  char *bytes = (char *)elements (b) + offset;
  ::diag_write (bytes, len);
}

void
java::io::FileDescriptor::close (void)
{
}

jint
java::io::FileDescriptor::seek (jlong pos, jint whence)
{
  JvAssert (whence == SET || whence == CUR);

  jlong len = length ();
  jlong here = getFilePointer ();

  if ((whence == SET && pos > len) || (whence == CUR && here + pos > len))
    JvThrow (new EOFException);

  return 0;
}

jlong
java::io::FileDescriptor::length (void)
{
  return 0;
}

jlong
java::io::FileDescriptor::getFilePointer (void)
{
  return 0;
}

jint
java::io::FileDescriptor::read (void)
{
  return 0;
}

jint
java::io::FileDescriptor::read (jbyteArray buffer, jint offset, jint count)
{
  return 0;
}

jint
java::io::FileDescriptor::available (void)
{
  return 0;
}