binary search in C

binary_search.c

int32_t binary_search(const uint8_t * array, const uint32_t length, uint8_t val)
{
	uint8_t low = 0;
	uint8_t high = length;
	
	do
	{	
		uint8_t index = floor((low + high)/2);
		if(val == array[index])
		{
			return index;
		}
		/* check if val is less than then value under the index*/
		else if(val < array[index])
		{
			high = index;
		}
		else
		{
			low = index + 1;
		}
	
	}while(low < high);
	return -1;  
}