static int keyboard()

in uhid/uhid-example.c [301:385]

• 82 lines of code
• 23 McCabe index (conditional complexity)

static int keyboard(int fd)
{
	char buf[128];
	ssize_t ret, i;

	ret = read(STDIN_FILENO, buf, sizeof(buf));
	if (ret == 0) {
		fprintf(stderr, "Read HUP on stdin\n");
		return -EFAULT;
	} else if (ret < 0) {
		fprintf(stderr, "Cannot read stdin: %m\n");
		return -errno;
	}

	for (i = 0; i < ret; ++i) {
		switch (buf[i]) {
		case '1':
			btn1_down = !btn1_down;
			ret = send_event(fd);
			if (ret)
				return ret;
			break;
		case '2':
			btn2_down = !btn2_down;
			ret = send_event(fd);
			if (ret)
				return ret;
			break;
		case '3':
			btn3_down = !btn3_down;
			ret = send_event(fd);
			if (ret)
				return ret;
			break;
		case 'a':
			abs_hor = -20;
			ret = send_event(fd);
			abs_hor = 0;
			if (ret)
				return ret;
			break;
		case 'd':
			abs_hor = 20;
			ret = send_event(fd);
			abs_hor = 0;
			if (ret)
				return ret;
			break;
		case 'w':
			abs_ver = -20;
			ret = send_event(fd);
			abs_ver = 0;
			if (ret)
				return ret;
			break;
		case 's':
			abs_ver = 20;
			ret = send_event(fd);
			abs_ver = 0;
			if (ret)
				return ret;
			break;
		case 'r':
			wheel = 1;
			ret = send_event(fd);
			wheel = 0;
			if (ret)
				return ret;
			break;
		case 'f':
			wheel = -1;
			ret = send_event(fd);
			wheel = 0;
			if (ret)
				return ret;
			break;
		case 'q':
			return -ECANCELED;
		default:
			fprintf(stderr, "Invalid input: %c\n", buf[i]);
		}
	}

	return 0;
}