| 1 | // |
|---|---|
| 2 | // stdin_line_reader.cpp |
| 3 | // ~~~~~~~~~~~~~~~~~~~~~ |
| 4 | // |
| 5 | // Copyright (c) 2003-2024 Christopher M. Kohlhoff (chris at kohlhoff dot com) |
| 6 | // |
| 7 | // Distributed under the Boost Software License, Version 1.0. (See accompanying |
| 8 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
| 9 | // |
| 10 | |
| 11 | #include "stdin_line_reader.hpp" |
| 12 | #include <boost/asio/deferred.hpp> |
| 13 | #include <boost/asio/read_until.hpp> |
| 14 | #include <iostream> |
| 15 | |
| 16 | stdin_line_reader::stdin_line_reader(boost::asio::any_io_executor ex) |
| 17 | : stdin_(ex, ::dup(STDIN_FILENO)) |
| 18 | { |
| 19 | } |
| 20 | |
| 21 | void stdin_line_reader::async_read_line_impl(std::string prompt, |
| 22 | boost::asio::any_completion_handler<void(boost::system::error_code, std::string)> handler) |
| 23 | { |
| 24 | std::cout << prompt; |
| 25 | std::cout.flush(); |
| 26 | |
| 27 | boost::asio::async_read_until(s&: stdin_, buffers: boost::asio::dynamic_buffer(data&: buffer_), delim: '\n', |
| 28 | token: boost::asio::deferred( |
| 29 | [this](boost::system::error_code ec, std::size_t n) |
| 30 | { |
| 31 | if (!ec) |
| 32 | { |
| 33 | std::string result = buffer_.substr(pos: 0, n: n); |
| 34 | buffer_.erase(pos: 0, n: n); |
| 35 | return boost::asio::deferred.values(args&: ec, args: std::move(result)); |
| 36 | } |
| 37 | else |
| 38 | { |
| 39 | return boost::asio::deferred.values(args&: ec, args: std::string{}); |
| 40 | } |
| 41 | } |
| 42 | ) |
| 43 | )(std::move(handler)); |
| 44 | } |
| 45 |