2.11BSD/src/usr.bin/struct/b.h

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/*	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;
	};