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/*
* This source code is released into the public domain.
*/
module;
#include <algorithm>
#include <expected>
#include <filesystem>
#include <iterator>
#include <ranges>
#include <span>
#include <system_error>
#include <fcntl.h>
#include <unistd.h>
export module nihil.posix:read_file;
import nihil.error;
import nihil.monad;
import :fd;
import :open;
namespace nihil {
/*
* Read the contents of a file into an output iterator.
*/
export [[nodiscard]] auto
read_file(std::filesystem::path const &filename,
std::output_iterator<char> auto &&iter)
-> std::expected<void, error>
{
auto file = co_await open(filename, O_RDONLY);
auto constexpr bufsize = std::size_t{1024};
auto buffer = std::array<char, bufsize>{};
for (;;) {
auto read_buf = co_await(read(file, buffer));
if (read_buf.empty())
co_return {};
std::ranges::copy(read_buf, iter);
}
}
} // namespace nihil
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