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natFileDescriptorWin32.cc (setLength): New method.

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2002-07-24  Tom Tromey  <tromey@redhat.com>
            Tony Kimball <alk@pobox.com>

	* java/io/natFileDescriptorWin32.cc (setLength): New method.
	* java/io/natFileDescriptorPosix.cc (setLength): New method.
	* java/io/RandomAccessFile.java (setLength): New method.
	* java/io/natFileDescriptorEcos.cc (setLength): New method.
	* java/io/FileDescriptor.java (setLength): New method.

Co-Authored-By: Tony Kimball <alk@pobox.com>

From-SVN: r55715
This commit is contained in:
Tom Tromey 2002-07-24 17:48:41 +00:00 • committed by Tom Tromey
parent 8a3ad73714
commit ce05139c56
6 changed files with 109 additions and 3 deletions
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34
libjava/java/io/natFileDescriptorPosix.cc
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@ -17,6 +17,8 @@ details. */
#include <string.h>
#include <sys/stat.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <fcntl.h>
#ifdef HAVE_SYS_IOCTL_H
#define BSD_COMP /* Get FIONREAD on Solaris2. */
@ -189,6 +191,38 @@ java::io::FileDescriptor::close (void)
throw new IOException (JvNewStringLatin1 (strerror (errno)));
}
void
java::io::FileDescriptor::setLength (jlong pos)
{
struct stat sb;
off_t orig;
if (::fstat (fd, &sb))
throw new IOException (JvNewStringLatin1 (strerror (errno)));
if ((jlong) sb.st_size == pos)
return;
orig = ::lseek (fd, (off_t) 0, SEEK_CUR);
if (orig == -1)
throw new IOException (JvNewStringLatin1 (strerror (errno)));
// If the file is too short, we extend it. We can't rely on
// ftruncate() extending the file. So we lseek() to 1 byte less
// than we want, and then we write a single byte at the end.
if ((jlong) sb.st_size < pos)
{
if (::lseek (fd, (off_t) (pos - 1), SEEK_SET) == -1)
throw new IOException (JvNewStringLatin1 (strerror (errno)));
char out = '\0';
int r = ::write (fd, &out, 1);
if (r <= 0 || ::lseek (fd, orig, SEEK_SET) == -1)
throw new IOException (JvNewStringLatin1 (strerror (errno)));
}
else if (::ftruncate (fd, (off_t) pos))
throw new IOException (JvNewStringLatin1 (strerror (errno)));
}
jint
java::io::FileDescriptor::seek (jlong pos, jint whence, jboolean eof_trunc)
{