From ce05139c56abbf21a0c8f81150542ed213d07581 Mon Sep 17 00:00:00 2001 From: Tom Tromey Date: Wed, 24 Jul 2002 17:48:41 +0000 Subject: natFileDescriptorWin32.cc (setLength): New method. 2002-07-24 Tom Tromey Tony Kimball * 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 From-SVN: r55715 --- libjava/java/io/natFileDescriptorPosix.cc | 34 +++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) (limited to 'libjava/java/io/natFileDescriptorPosix.cc') diff --git a/libjava/java/io/natFileDescriptorPosix.cc b/libjava/java/io/natFileDescriptorPosix.cc index bfe0009..fb11d62 100644 --- a/libjava/java/io/natFileDescriptorPosix.cc +++ b/libjava/java/io/natFileDescriptorPosix.cc @@ -17,6 +17,8 @@ details. */ #include #include #include +#include +#include #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) { -- cgit v1.1