#ifndef __TERMINAL_H__
#define __TERMINAL_H__


#include "defines.h"	/* COLOR, SCROLLCODE */
#include "retcode.h"

/*
 * The editor communicates with the display using a high level interface. A
 * "TERM" structure holds useful variables, and indirect pointers to routines
 * that do useful operations. The low level get and put routines are here too.
 * This lets a terminal, in addition to having non standard commands, have
 * funny get and put character code too. The calls might get changed to
 * "termp->t_field" style in the future, to make it possible to run more than
 * one terminal type.
 */
struct terminal {
	short t_mrow;		/* max number of rows allowable */
	short t_nrow;		/* current number of rows used  */
	short t_mcol;		/* max Number of columns.       */
	short t_ncol;		/* current Number of columns.   */
	short t_margin;		/* min margin for extended lines */
	short t_scrsiz;		/* size of scroll region "      */
	int t_pause;		/* # times thru update to pause */
	void (*t_open)(void);	/* Open terminal at the start.  */
	void (*t_close)(void);	/* Close terminal at end.       */
	void (*t_kopen)(void);	/* Open keyboard                */
	void (*t_kclose)(void);	/* close keyboard               */
	int (*t_getchar)(void);	/* Get character from keyboard. */
	int (*t_putchar)(int);	/* Put character to display.    */
	void (*t_flush) (void);	/* Flush output buffers.        */
	void (*t_move)(int, int);/* Move the cursor, origin 0.   */
	void (*t_eeol)(void);	/* Erase to end of line.        */
	void (*t_eeop)(void);	/* Erase to end of page.        */
	void (*t_beep)(void);	/* Beep.                        */
	void (*t_rev)(int);	/* set reverse video state      */
	int (*t_rez)(char *);	/* change screen resolution     */
#if	COLOR
	int (*t_setfor) ();	/* set forground color          */
	int (*t_setback) ();	/* set background color         */
#endif
#if     SCROLLCODE
	void (*t_scroll)(int, int,int);	/* scroll a region of the screen */
#endif
};

/*	TEMPORARY macros for terminal I/O  (to be placed in a machine
					    dependant place later)	*/

#define	TTopen		(*term.t_open)
#define	TTclose		(*term.t_close)
#define	TTkopen		(*term.t_kopen)
#define	TTkclose	(*term.t_kclose)
#define	TTgetc		(*term.t_getchar)
#define	TTputc		(*term.t_putchar)
#define	TTflush		(*term.t_flush)
#define	TTmove		(*term.t_move)
#define	TTeeol		(*term.t_eeol)
#define	TTeeop		(*term.t_eeop)
#define	TTbeep		(*term.t_beep)
#define	TTrev		(*term.t_rev)
#define	TTrez		(*term.t_rez)
#if	COLOR
#define	TTforg		(*term.t_setfor)
#define	TTbacg		(*term.t_setback)
#endif

/* Terminal table defined only in term.c */
extern struct terminal term ;

extern int ttrow ;		/* Row location of HW cursor */
extern int ttcol ;		/* Column location of HW cursor */

extern boolean eolexist ;	/* does clear to EOL exist?     */
extern boolean revexist ;	/* does reverse video exist?    */
extern boolean sgarbf ;		/* State of screen unknown      */

extern char sres[] ;	        /* Current screen resolution.   */

#endif