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Move DoubleBuffer to its own files.

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This commit is contained in:
Andreas Kling 2018-12-03 01:51:44 +01:00
parent aff89d2fd7
commit bbfae19238
5 changed files with 56 additions and 49 deletions
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26
Kernel/TTY.cpp
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@ -6,32 +6,6 @@
//#define TTY_DEBUG
void DoubleBuffer::flip()
{
ASSERT(m_read_buffer_index == m_read_buffer->size());
swap(m_read_buffer, m_write_buffer);
m_write_buffer->clear();
m_read_buffer_index = 0;
}
ssize_t DoubleBuffer::write(const byte* data, size_t size)
{
m_write_buffer->append(data, size);
return size;
}
ssize_t DoubleBuffer::read(byte* data, size_t size)
{
if (m_read_buffer_index >= m_read_buffer->size() && !m_write_buffer->isEmpty())
flip();
if (m_read_buffer_index >= m_read_buffer->size())
return 0;
ssize_t nread = min(m_read_buffer->size() - m_read_buffer_index, size);
memcpy(data, m_read_buffer->data() + m_read_buffer_index, nread);
m_read_buffer_index += nread;
return nread;
}
TTY::TTY(unsigned major, unsigned minor)
: CharacterDevice(major, minor)
{