static long buffer_op()

in kernel/skas/uaccess.c [95:136]

• 35 lines of code
• 10 McCabe index (conditional complexity)

static long buffer_op(unsigned long addr, int len, int is_write,
		      int (*op)(unsigned long, int, void *), void *arg)
{
	long size, remain, n;

	size = min(PAGE_ALIGN(addr) - addr, (unsigned long) len);
	remain = len;

	n = do_op_one_page(addr, size, is_write, op, arg);
	if (n != 0) {
		remain = (n < 0 ? remain : 0);
		goto out;
	}

	addr += size;
	remain -= size;
	if (remain == 0)
		goto out;

	while (addr < ((addr + remain) & PAGE_MASK)) {
		n = do_op_one_page(addr, PAGE_SIZE, is_write, op, arg);
		if (n != 0) {
			remain = (n < 0 ? remain : 0);
			goto out;
		}

		addr += PAGE_SIZE;
		remain -= PAGE_SIZE;
	}
	if (remain == 0)
		goto out;

	n = do_op_one_page(addr, remain, is_write, op, arg);
	if (n != 0) {
		remain = (n < 0 ? remain : 0);
		goto out;
	}

	return 0;
 out:
	return remain;
}