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#include "FileHandle.h"
#include "FileSystem.h"
#include "CharacterDevice.h"
#include "sys-errno.h"
#include "UnixTypes.h"
#include "TTY.h"
#include <AK/BufferStream.h>
#include <Kernel/Task.h>
FileHandle::FileHandle(RetainPtr<VirtualFileSystem::Node>&& vnode)
: m_vnode(move(vnode))
{
}
FileHandle::~FileHandle()
{
}
#ifndef SERENITY
bool additionWouldOverflow(Unix::off_t a, Unix::off_t b)
{
ASSERT(a > 0);
uint64_t ua = a;
return (ua + b) > maxFileOffset;
}
#endif
int FileHandle::stat(Unix::stat* buffer)
{
if (!m_vnode)
return -EBADF;
auto metadata = m_vnode->metadata();
if (!metadata.isValid())
return -EIO;
buffer->st_dev = 0; // FIXME
buffer->st_ino = metadata.inode.index();
buffer->st_mode = metadata.mode;
buffer->st_nlink = metadata.linkCount;
buffer->st_uid = metadata.uid;
buffer->st_gid = metadata.gid;
buffer->st_rdev = 0; // FIXME
buffer->st_size = metadata.size;
buffer->st_blksize = metadata.blockSize;
buffer->st_blocks = metadata.blockCount;
buffer->st_atime = metadata.atime;
buffer->st_mtime = metadata.mtime;
buffer->st_ctime = metadata.ctime;
return 0;
}
Unix::off_t FileHandle::seek(Unix::off_t offset, int whence)
{
if (!m_vnode)
return -EBADF;
// FIXME: The file type should be cached on the vnode.
// It's silly that we have to do a full metadata lookup here.
auto metadata = m_vnode->metadata();
if (!metadata.isValid())
return -EIO;
if (metadata.isSocket() || metadata.isFIFO())
return -ESPIPE;
Unix::off_t newOffset;
switch (whence) {
case SEEK_SET:
newOffset = offset;
break;
case SEEK_CUR:
newOffset = m_currentOffset + offset;
#ifndef SERENITY
if (additionWouldOverflow(m_currentOffset, offset))
return -EOVERFLOW;
#endif
if (newOffset < 0)
return -EINVAL;
break;
case SEEK_END:
ASSERT(metadata.size); // FIXME: What do I do?
newOffset = metadata.size;
break;
default:
return -EINVAL;
}
m_currentOffset = newOffset;
return m_currentOffset;
}
Unix::ssize_t FileHandle::read(byte* buffer, Unix::size_t count)
{
if (m_vnode->isCharacterDevice()) {
// FIXME: What should happen to m_currentOffset?
return m_vnode->characterDevice()->read(buffer, count);
}
Unix::ssize_t nread = m_vnode->fileSystem()->readInodeBytes(m_vnode->inode, m_currentOffset, count, buffer, this);
m_currentOffset += nread;
return nread;
}
Unix::ssize_t FileHandle::write(const byte* data, Unix::size_t size)
{
if (m_vnode->isCharacterDevice()) {
// FIXME: What should happen to m_currentOffset?
return m_vnode->characterDevice()->write(data, size);
}
// FIXME: Implement non-device writes.
ASSERT_NOT_REACHED();
return -1;
}
bool FileHandle::hasDataAvailableForRead()
{
if (m_vnode->isCharacterDevice())
return m_vnode->characterDevice()->hasDataAvailableForRead();
return true;
}
ByteBuffer FileHandle::readEntireFile()
{
if (m_vnode->isCharacterDevice()) {
auto buffer = ByteBuffer::createUninitialized(1024);
Unix::ssize_t nread = m_vnode->characterDevice()->read(buffer.pointer(), buffer.size());
buffer.trim(nread);
return buffer;
}
return m_vnode->fileSystem()->readEntireInode(m_vnode->inode, this);
}
bool FileHandle::isDirectory() const
{
return m_vnode->metadata().isDirectory();
}
ssize_t FileHandle::get_dir_entries(byte* buffer, Unix::size_t size)
{
auto metadata = m_vnode->metadata();
if (!metadata.isValid())
return -EIO;
if (!metadata.isDirectory())
return -ENOTDIR;
// FIXME: Compute the actual size needed.
auto tempBuffer = ByteBuffer::createUninitialized(2048);
BufferStream stream(tempBuffer);
m_vnode->vfs()->enumerateDirectoryInode(m_vnode->inode, [&stream] (auto& entry) {
stream << (dword)entry.inode.index();
stream << (byte)entry.fileType;
stream << (dword)entry.name.length();
stream << entry.name;
return true;
});
if (size < stream.offset())
return -1;
memcpy(buffer, tempBuffer.pointer(), stream.offset());
return stream.offset();
}
bool FileHandle::isTTY() const
{
if (auto* device = m_vnode->characterDevice())
return device->isTTY();
return false;
}
const TTY* FileHandle::tty() const
{
if (auto* device = m_vnode->characterDevice())
return static_cast<const TTY*>(device);
return nullptr;
}
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