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Almathera Ten Pack 3: CDPD 3
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001-025
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vt52.c
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C/C++ Source or Header
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1995-03-17
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2KB
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99 lines
/*
* 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.
*/
#include <stdio.h>
#include "ed.h"
#if VT52
#define NROW 24 /* Screen size. */
#define NCOL 80 /* Edit if you want to. */
#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();
/*
* Dispatch table. All the
* hard fields just point into the
* terminal I/O code.
*/
TERM term = {
NROW-1,
NCOL,
&vt52open,
&ttclose,
&ttgetc,
&ttputc,
&ttflush,
&vt52move,
&vt52eeol,
&vt52eeop,
&vt52beep
};
vt52move(row, col)
{
ttputc(ESC);
ttputc('Y');
ttputc(row+BIAS);
ttputc(col+BIAS);
}
vt52eeol()
{
ttputc(ESC);
ttputc('K');
}
vt52eeop()
{
ttputc(ESC);
ttputc('J');
}
vt52beep()
{
#ifdef BEL
ttputc(BEL);
ttflush();
#endif
}
#endif
vt52open()
{
#if V7
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();
}