static ssize_t led_proc_write()

in led.c [175:231]

• 45 lines of code
• 18 McCabe index (conditional complexity)

static ssize_t led_proc_write(struct file *file, const char __user *buf,
	size_t count, loff_t *pos)
{
	void *data = PDE_DATA(file_inode(file));
	char *cur, lbuf[32];
	int d;

	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;

	if (count >= sizeof(lbuf))
		count = sizeof(lbuf)-1;

	if (copy_from_user(lbuf, buf, count))
		return -EFAULT;
	lbuf[count] = 0;

	cur = lbuf;

	switch ((long)data)
	{
	case LED_NOLCD:
		d = *cur++ - '0';
		if (d != 0 && d != 1) goto parse_error;
		led_heartbeat = d;

		if (*cur++ != ' ') goto parse_error;

		d = *cur++ - '0';
		if (d != 0 && d != 1) goto parse_error;
		led_diskio = d;

		if (*cur++ != ' ') goto parse_error;

		d = *cur++ - '0';
		if (d != 0 && d != 1) goto parse_error;
		led_lanrxtx = d;

		break;
	case LED_HASLCD:
		if (*cur && cur[strlen(cur)-1] == '\n')
			cur[strlen(cur)-1] = 0;
		if (*cur == 0) 
			cur = lcd_text_default;
		lcd_print(cur);
		break;
	default:
		return 0;
	}
	
	return count;

parse_error:
	if ((long)data == LED_NOLCD)
		printk(KERN_CRIT "Parse error: expect \"n n n\" (n == 0 or 1) for heartbeat,\ndisk io and lan tx/rx indicators\n");
	return -EINVAL;
}