19 #define	Xinit(xs, xp, length, area) do { \  argument
29 #define	Xput(xs, xp, c)	(*xp++ = (c))  argument
32 #define	XcheckN(xs, xp, n) do { \  argument
39 #define Xcheck(xs, xp)	XcheckN(xs, xp, 1)  argument
42 #define	Xfree(xs, xp)	afree((void*) (xs).beg, (xs).areap)  argument
45 #define	Xclose(xs, xp)	(char*) aresize((void*)(xs).beg, \  argument
48 #define	Xstring(xs, xp)	((xs).beg)  argument
50 #define Xnleft(xs, xp) ((xs).end - (xp))	/* may be less than 0 */  argument
51 #define	Xlength(xs, xp) ((xp) - (xs).beg)  argument
52 #define Xsize(xs, xp) ((xs).end - (xs).beg)  argument
53 #define	Xsavepos(xs, xp) ((xp) - (xs).beg)  argument
54 #define	Xrestpos(xs, xp, n) ((xs).beg + (n))  argument