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#include "kernel/filesystem/file_descriptor_table.hpp"
#include "kapi/system.hpp"
#include "kernel/filesystem/open_file_description.hpp"
#include <algorithm>
#include <cstddef>
#include <optional>
namespace filesystem
{
namespace
{
constinit auto static global_file_descriptor_table = std::optional<file_descriptor_table>{};
} // namespace
auto file_descriptor_table::init() -> void
{
if (global_file_descriptor_table)
{
kapi::system::panic("[FILESYSTEM] File descriptor table has already been initialized.");
}
global_file_descriptor_table.emplace(file_descriptor_table{});
}
auto file_descriptor_table::get() -> file_descriptor_table &
{
if (!global_file_descriptor_table)
{
kapi::system::panic("[FILESYSTEM] File descriptor table has not been initialized.");
}
return *global_file_descriptor_table;
}
auto file_descriptor_table::add_file(open_file_description & file_description) -> int
{
auto it = std::ranges::find_if(m_open_files, [](auto & open_file) { return !open_file.has_value(); });
if (it != m_open_files.end())
{
*it = file_description;
return static_cast<int>(it - m_open_files.begin());
}
m_open_files.push_back(file_description);
return static_cast<int>(m_open_files.size() - 1);
}
auto file_descriptor_table::get_file(int fd) const -> std::optional<open_file_description>
{
if (fd < 0)
{
return std::nullopt;
}
auto const index = static_cast<size_t>(fd);
if (index >= m_open_files.size() || !m_open_files.at(fd).has_value())
{
return std::nullopt;
}
return m_open_files.at(fd);
}
auto file_descriptor_table::remove_file(int fd) -> void
{
if (fd < 0)
{
return;
}
auto const index = static_cast<size_t>(fd);
if (index >= m_open_files.size())
{
return;
}
m_open_files.at(fd).reset();
}
} // namespace filesystem
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