i starting too high

[Tishj]

static void	*xmalloc(size_t size)
{
	static int fail = 0;
	static int i = 1;

	if (i == fail)
		return (NULL);
	i++;
	return (malloc(size));
}

I set the at_which_malloc_to_fail to 0, because i starts at 1 this will never happen
also if I could make a suggestion, there's no need for 2 static variables, since one is generated anyways, if (i == X) would be enough I think :P?

[hilmi-yilmaz]

Fixed the at_which_malloc_to_fail. Now the user can only enter values starting from 1. Also removed the static from fail variable. Thanks Thijs!