1421 #define Xinit(xs, xp, length, area) do {			\  argument
1423 	(xp) = (xs).beg;					\
1427 #define Xput(xs, xp, c)	(*xp++ = (c))  argument
1430 #define XcheckN(xs, xp, n) do {					\  argument
1431 	ssize_t more = ((xp) + (n)) - (xs).end;			\
1433 		(xp) = Xcheck_grow(&(xs), (xp), more);		\
1437 #define Xcheck(xs, xp)	XcheckN((xs), (xp), 1)  argument
1440 #define Xfree(xs, xp)	afree((xs).beg, (xs).areap)  argument
1443 #define Xclose(xs, xp)	aresize((xs).beg, (xp) - (xs).beg, (xs).areap)  argument
1446 #define Xstring(xs, xp)	((xs).beg)  argument
1448 #define Xnleft(xs, xp)	((xs).end - (xp))	/* may be less than 0 */  argument
1449 #define Xlength(xs, xp)	((xp) - (xs).beg)  argument
1450 #define Xsize(xs, xp)	((xs).end - (xs).beg)  argument
1451 #define Xsavepos(xs, xp)	((xp) - (xs).beg)  argument
1452 #define Xrestpos(xs, xp, n)	((xs).beg + (n))  argument