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LibCore+Tests: Add SeekableStream::truncate()

This commit is contained in:
Sam Atkins 2022-02-03 19:21:51 +00:00 committed by Tim Flynn
parent d9fb1b8c2e
commit 4d5080388a
4 changed files with 27 additions and 0 deletions

View file

@ -26,6 +26,8 @@ public:
virtual bool is_open() const override { return true; }
// FIXME: It doesn't make sense to close an memory stream. Therefore, we don't do anything here. Is that fine?
virtual void close() override { }
// FIXME: It doesn't make sense to truncate a memory stream. Therefore, we don't do anything here. Is that fine?
virtual ErrorOr<void> truncate(off_t) override { return Error::from_errno(ENOTSUP); }
virtual ErrorOr<size_t> read(Bytes bytes) override
{

View file

@ -215,6 +215,11 @@ ErrorOr<off_t> File::seek(i64 offset, SeekMode mode)
return seek_result;
}
ErrorOr<void> File::truncate(off_t length)
{
return System::ftruncate(m_fd, length);
}
ErrorOr<int> Socket::create_fd(SocketDomain domain, SocketType type)
{
int socket_domain;

View file

@ -81,6 +81,9 @@ public:
/// Returns the total size of the stream, or an errno in the case of an
/// error. May not preserve the original position on the stream on failure.
virtual ErrorOr<off_t> size();
/// Shrinks or extends the stream to the given size. Returns an errno in
/// the case of an error.
virtual ErrorOr<void> truncate(off_t length) = 0;
};
/// The Socket class is the base class for all concrete BSD-style socket
@ -197,6 +200,7 @@ public:
virtual bool is_open() const override;
virtual void close() override;
virtual ErrorOr<off_t> seek(i64 offset, SeekMode) override;
virtual ErrorOr<void> truncate(off_t length) override;
virtual ~File() override { close(); }
@ -757,6 +761,10 @@ public:
m_helper.clear_buffer();
return result;
}
virtual ErrorOr<void> truncate(off_t length) override
{
return m_helper.stream().truncate(length);
}
ErrorOr<size_t> read_line(Bytes buffer) { return m_helper.read_line(move(buffer)); }
ErrorOr<size_t> read_until(Bytes buffer, StringView candidate) { return m_helper.read_until(move(buffer), move(candidate)); }