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/* 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.
*/
struct terminal 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;
}
#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
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()
{
}
#endif
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