static ssize_t keypad_read()

in panel.c [1024:1047]

• 20 lines of code
• 6 McCabe index (conditional complexity)

static ssize_t keypad_read(struct file *file,
			   char __user *buf, size_t count, loff_t *ppos)
{
	unsigned i = *ppos;
	char __user *tmp = buf;

	if (keypad_buflen == 0) {
		if (file->f_flags & O_NONBLOCK)
			return -EAGAIN;

		if (wait_event_interruptible(keypad_read_wait,
					     keypad_buflen != 0))
			return -EINTR;
	}

	for (; count-- > 0 && (keypad_buflen > 0);
	     ++i, ++tmp, --keypad_buflen) {
		put_user(keypad_buffer[keypad_start], tmp);
		keypad_start = (keypad_start + 1) % KEYPAD_BUFFER;
	}
	*ppos = i;

	return tmp - buf;
}