Digital的Unix操作系统VAX 4.2源码

				/*	b.h	4.2	83/08/11	*/								extern int xxindent, xxval, newflag, xxmaxchars, xxbpertab;				extern int xxlineno;		/* # of lines already output */				#define xxtop	100		/* max size of xxstack */				extern int xxstind, xxstack[xxtop], xxlablast, xxt;				struct node					{int op;					char *lit;					struct node *left;					struct node *right;					};