define header_size = 3;
define protection_size = 4;
define heap_size = 65536

global heap[header_size] = 0;

🗿HEADER REPRESENTATION
🗿+-------------------------+-----------------------------+-----------------------------+---------+---------+---------+
🗿| index of the next block | index of the previous block | used (if the block is used) | padding | data    | padding |
🗿| 1 case                  | 1 case                      | 1 case                      | 4 cases | n cases | 4 cases | 
🗿+-------------------------+-----------------------------+-----------------------------+---------+---------+---------+

🗿 padding is use to check invalid write


setup_header(pos, size, preview_pos)
{
	local i;
	
	[ptr] = pos;
	[ptr + 1] = 0;

	i = header_size;
	loop {
		if (i == protection_size)
			break;
		[ptr + i] = 0;
		[ptr + i + size] = 0;
		i++;
	}
}

find_next_space(size)
{
	local current;
	local next;

	current = 0;
	loop
	{
		if (current > header_size)
			return (0);
		next_block = heap + current;
		if ([next_block] == 0)				🗿check if the block is the last
			| ([heap + current + 1] == 0)	🗿check if the block is not used
			return (heap + current);
		current = [heap + next_block];
	}
}

salloc (size)
{
	local p;
}