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Lots of hacking to make a very simple "ls" utility.

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I added a dead-simple malloc that only allows allocations < 4096 bytes.
It just forwards the request to mmap() every time.

I also added simplified versions of opendir() and readdir().
This commit is contained in:
Andreas Kling 2018-10-24 12:43:52 +02:00
parent 0c5bbac86e
commit bca4b71bfa
19 changed files with 277 additions and 67 deletions
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29
VirtualFileSystem/FileHandle.cpp
View file

@ -3,6 +3,7 @@
#include "CharacterDevice.h"
#include "sys-errno.h"
#include "UnixTypes.h"
#include <AK/BufferStream.h>
FileHandle::FileHandle(RetainPtr<VirtualFileSystem::Node>&& vnode)
: m_vnode(move(vnode))
@ -29,7 +30,7 @@ int FileHandle::stat(Unix::stat* buffer)
if (!m_vnode)
return -EBADF;
auto metadata = m_vnode->inode.metadata();
auto metadata = m_vnode->metadata();
if (!metadata.isValid())
return -EIO;
@ -58,7 +59,7 @@ Unix::off_t FileHandle::seek(Unix::off_t offset, int whence)
// 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->inode.metadata();
auto metadata = m_vnode->metadata();
if (!metadata.isValid())
return -EIO;
@ -120,3 +121,27 @@ ByteBuffer FileHandle::readEntireFile()
return m_vnode->fileSystem()->readEntireInode(m_vnode->inode);
}
ssize_t FileHandle::get_dir_entries(byte* buffer, size_t size)
{
Locker locker(VirtualFileSystem::lock());
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] (const FileSystem::DirectoryEntry& entry) {
stream << (dword)entry.inode.index();
stream << (byte)entry.fileType;
stream << (dword)entry.name.length();
stream << entry.name;
return true;
});
memcpy(buffer, tempBuffer.pointer(), stream.offset());
return stream.offset();
}