#include <stdio.h>
#include <unistd.h>
#include <sys/epoll.h>

#include "baud.h"

int main(int argc, char *argv[])
{
	struct epoll_event ev;
	int fd, baud, ret;
	int epoll_fd;
	char *device;
	char buf[256];

	if (argc < 2) {
		printf("Usage: %s SERIAL_DEVICE\n", argv[0]);
		return 1;
	}

	baud = 128000;
	device = argv[1];

	fd = open_at_baud(device, &baud);
	if (fd < 0)
		return 1;

	if (baud != 128000) {
		printf("Failed to set baudrate to 128000, only got %d\n", baud);
		close(fd);
		return 1;
	}

	epoll_fd = epoll_create(1);

	ev.events = EPOLLIN;
	ev.data.fd = fd;
	if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, fd, &ev) == -1) {
		perror("epoll_ctl");
		return 1;
	}

	while (1) {
		ret = epoll_wait(epoll_fd, &ev, 1, -1);
		if (ret == 0)
			continue;

		if (ret < 0) {
			perror("epoll");
			return 1;
		}

		ret = read(fd, buf, sizeof(buf));
		if (read < 0) {
			perror("read");
			break;
		}

		if (ret == 0)
			break;

		ret = write(1, buf, ret);
		if (read < 0) {
			perror("write");
			break;
		}
	}

	close(fd);
	return 0;
}