/*	VT52.C
 *
 * The routines in this file
 * provide support for VT52 style terminals
 * over a serial line. The serial I/O services are
 * provided by routines in "termio.c". It compiles
 * into nothing if not a VT52 style device. The
 * bell on the VT52 is terrible, so the "beep"
 * routine is conditionalized on defining BEL.
 *
 *	modified by Petri Kutvonen
 */

#define	termdef	1		/* don't define "term" external */

#include        <stdio.h>
#include        "estruct.h"
#include	"edef.h"

#if     VT52

#define NROW    24		/* Screen size.                 */
#define NCOL    80		/* Edit if you want to.         */
#define	MARGIN	8		/* size of minimim margin and   */
#define	SCRSIZ	64		/* scroll size for extended lines */
#define	NPAUSE	100		/* # times thru update to pause */
#define BIAS    0x20		/* Origin 0 coordinate bias.    */
#define ESC     0x1B		/* ESC character.               */
#define BEL     0x07		/* ascii bell character         */

extern int ttopen();		/* Forward references.          */
extern int ttgetc();
extern int ttputc();
extern int ttflush();
extern int ttclose();
extern int vt52move();
extern int vt52eeol();
extern int vt52eeop();
extern int vt52beep();
extern int vt52open();
extern int vt52rev();
extern int vt52cres();
extern int vt52kopen();
extern int vt52kclose();

#if	COLOR
extern int vt52fcol();
extern int vt52bcol();
#endif

/*
 * Dispatch table. All the
 * hard fields just point into the
 * terminal I/O code.
 */
TERM term = {
	NROW - 1,
	NROW - 1,
	NCOL,
	NCOL,
	MARGIN,
	SCRSIZ,
	NPAUSE,
	&vt52open,
	&ttclose,
	&vt52kopen,
	&vt52kclose,
	&ttgetc,
	&ttputc,
	&ttflush,
	&vt52move,
	&vt52eeol,
	&vt52eeop,
	&vt52beep,
	&vt52rev,
	&vt52cres
#if	COLOR
	    , &vt52fcol,
	&vt52bcol
#endif
#if	SCROLLCODE
	    , NULL
#endif
};

vt52move(row, col)
{
	ttputc(ESC);
	ttputc('Y');
	ttputc(row + BIAS);
	ttputc(col + BIAS);
}

vt52eeol()
{
	ttputc(ESC);
	ttputc('K');
}

vt52eeop()
{
	ttputc(ESC);
	ttputc('J');
}

vt52rev(status)
    /* set the reverse video state */
int status;			/* TRUE = reverse video, FALSE = normal video */

{
	/* can't do this here, so we won't */
}

vt52cres()
{				/* change screen resolution - (not here though) */
	return (TRUE);
}

spal()
{				/* change palette string */
	/*      Does nothing here       */
}

#if	COLOR
vt52fcol()
{				/* set the forground color [NOT IMPLIMENTED] */
}

vt52bcol()
{				/* set the background color [NOT IMPLIMENTED] */
}
#endif

vt52beep()
{
#ifdef  BEL
	ttputc(BEL);
	ttflush();
#endif
}

vt52open()
{
#if     V7 | BSD
	register char *cp;
	char *getenv();

	if ((cp = getenv("TERM")) == NULL) {
		puts("Shell variable TERM not defined!");
		exit(1);
	}
	if (strcmp(cp, "vt52") != 0 && strcmp(cp, "z19") != 0) {
		puts("Terminal type not 'vt52'or 'z19' !");
		exit(1);
	}
#endif
	ttopen();
}

vt52kopen()
{
}

vt52kclose()
{
}


#if	FNLABEL
fnclabel(f, n)
    /* label a function key */
int f, n;			/* default flag, numeric argument [unused] */

{
	/* on machines with no function keys...don't bother */
	return (TRUE);
}
#endif
#else

vt52hello()
{
}

#endif