394 static void boundary_abs(int a, int adir, int *b, int *bdir)
398 		*bdir = -adir;
401 		*bdir = adir;
406 void boundary_sub(int a, int adir, int b, int bdir, int *c, int *cdir)  in boundary_sub()  argument
409 	bdir = bdir < 0 ? -1 : (bdir > 0 ? 1 : 0);  in boundary_sub()
411 	*cdir = adir - bdir;  in boundary_sub()
421 int boundary_lt(unsigned int a, int adir, unsigned int b, int bdir)  in boundary_lt()  argument
424 	assert(b > 0 || bdir >= 0);  in boundary_lt()
430 	if (bdir < 0) {  in boundary_lt()
432 		bdir = 1;  in boundary_lt()
433 	} else if (bdir > 0)  in boundary_lt()
434 		bdir = 1;  in boundary_lt()
435 	return a < b || (a == b && adir < bdir);  in boundary_lt()