memcmp with unmatched index.

memcmp_idx.c

uint8_t memcmp_idx(uint8_t *arr1, uint8_t *arr2, size_t len, size_t *diff_idx){
	size_t i = 0;
	uint8_t ret = 0;
	while(i < len)
	{
		if(arr1[i] > arr2[i])
		{
			ret = 1;
			break;
		}
		else if(arr1[i] < arr2[i])
		{
			ret = -1;
			break;
		}
		i++;
	}
	*diff_idx = i;
	return ret;
}