lex.h

一个编译器修改的例子

#ifndef LEX_H
#define LEX_H

#include <stdio.h>

extern FILE	*yyin;

/* The following two variables are copied by the new_token function.
 */
extern char	*yytext;    	/* String representation of the recognised
				 * token, set by yylex().
				 */
extern unsigned current_line;	/* Maintained by the C-code in lex.l */

extern int	yylex(void);

#endif