William A. Kennington III | ba04ffb | 2018-09-20 11:35:11 -0700 | [diff] [blame] | 1 | /** |
| 2 | * Reads stdin looking for a string, and coalesces that buffer until stdin |
| 3 | * is calm for the passed in number of seconds. |
| 4 | */ |
| 5 | |
| 6 | #include <array> |
| 7 | #include <chrono> |
| 8 | #include <cstdio> |
| 9 | #include <sdeventplus/clock.hpp> |
| 10 | #include <sdeventplus/event.hpp> |
| 11 | #include <sdeventplus/source/io.hpp> |
| 12 | #include <sdeventplus/utility/timer.hpp> |
| 13 | #include <string> |
| 14 | #include <unistd.h> |
| 15 | #include <utility> |
| 16 | |
| 17 | using sdeventplus::Clock; |
| 18 | using sdeventplus::ClockId; |
| 19 | using sdeventplus::Event; |
| 20 | using sdeventplus::source::IO; |
| 21 | |
| 22 | constexpr auto clockId = ClockId::RealTime; |
| 23 | using Timer = sdeventplus::utility::Timer<clockId>; |
| 24 | |
| 25 | int main(int argc, char* argv[]) |
| 26 | { |
| 27 | if (argc != 2) |
| 28 | { |
| 29 | fprintf(stderr, "Usage: %s [seconds]\n", argv[0]); |
| 30 | return 1; |
| 31 | } |
| 32 | |
| 33 | std::chrono::seconds delay(std::stoul(argv[1])); |
| 34 | |
| 35 | auto event = Event::get_default(); |
| 36 | |
| 37 | std::string content; |
| 38 | auto timerCb = [&](Timer&) { |
| 39 | printf("%s", content.c_str()); |
| 40 | content.clear(); |
| 41 | }; |
| 42 | Timer timer(event, std::move(timerCb)); |
| 43 | |
| 44 | auto ioCb = [&](IO&, int fd, uint32_t) { |
| 45 | std::array<char, 4096> buffer; |
| 46 | ssize_t bytes = read(fd, buffer.data(), buffer.size()); |
| 47 | if (bytes <= 0) |
| 48 | { |
| 49 | printf("%s", content.c_str()); |
| 50 | event.exit(bytes < 0); |
| 51 | return; |
| 52 | } |
| 53 | content.append(buffer.data(), bytes); |
| 54 | timer.restartOnce(delay); |
| 55 | }; |
| 56 | IO ioSource(event, STDIN_FILENO, EPOLLIN, std::move(ioCb)); |
| 57 | |
| 58 | return event.loop(); |
| 59 | } |