bdef.c

unix v7是最后一个广泛发布的研究型UNIX版本

#define xxtop	100		/* max size of xxstack */
int xxindent, xxval, newflag, xxmaxchars, xxbpertab;
int xxlineno;		/* # of lines already output */
int xxstind, xxstack[xxtop], xxlablast, xxt;