epp.h

代码有点长,需细心阅读,仅供影音视听类产品的开发人员参考

#ifndef __EPP_H
#define __EPP_H

/*
** EPP/Bidirectional Printer Port Access Service
**
** FUNCTION
**
** void	reset_epp(void);
** int	polling_epp(void);
** void	epp_flush(void);
** void	epp_write(const char *);
** void	epp_write_slow(const char *);
** void	epp_write_wait(const char *);
*/

/*
** UNIX emulation
*/
#if	defined(UNIX)
#include <stdio.h>
#define	reset_epp()		0
#define	polling_epp()		0
#define	epp_flush()		(fflush(stderr))
#define	epp_write(str)		(fprintf(stderr, "EPP: %s", (str)))
#define	epp_write_slow(str)	(fprintf(stderr, "EPP: %s", (str)))
#define	epp_write_wait(str)	(fprintf(stderr, "EPP: %s", (str)), fflush(stderr))
/*
** Target System EPP
*/
#elif	SUPPORT_EPP
void    reset_epp(void);
int     polling_epp(void);
void    epp_flush(void);
void    epp_write(const char *);
void    epp_write_slow(const char *);
void    epp_write_wait(const char *);

/*
** disable EPP functions
*/
#else
#define	reset_epp()		0
#define	polling_epp()		0
#define	epp_flush()
#define	epp_write(str)		((void)0)
#define	epp_write_slow(str)	((void)0)
#define	epp_write_wait(str)	((void)0)
#endif

#endif/*__EPP_H*/