103 lines
1.7 KiB
C
103 lines
1.7 KiB
C
/*
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* The routines in this file
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* provide support for VT52 style terminals
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* over a serial line. The serial I/O services are
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* provided by routines in "termio.c". It compiles
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* into nothing if not a VT52 style device. The
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* bell on the VT52 is terrible, so the "beep"
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* routine is conditionalized on defining BEL.
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*/
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#include <stdio.h>
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#include "ed.h"
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#if VT52
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#if GEM
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#define NROW 25 /* Screen size. */
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#else
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#define NROW 24 /* Screen size. */
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#endif
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#define NCOL 80 /* Edit if you want to. */
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#define BIAS 0x20 /* Origin 0 coordinate bias. */
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#define ESC 0x1B /* ESC character. */
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#define BEL 0x07 /* ascii bell character */
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extern int ttopen(); /* Forward references. */
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extern int ttgetc();
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extern int ttputc();
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extern int ttflush();
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extern int ttclose();
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extern int vt52move();
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extern int vt52eeol();
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extern int vt52eeop();
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extern int vt52beep();
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extern int vt52open();
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/*
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* Dispatch table. All the
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* hard fields just point into the
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* terminal I/O code.
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*/
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TERM term = {
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NROW-1,
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NCOL,
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&vt52open,
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&ttclose,
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&ttgetc,
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&ttputc,
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&ttflush,
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&vt52move,
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&vt52eeol,
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&vt52eeop,
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&vt52beep
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};
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vt52move(row, col)
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{
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ttputc(ESC);
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ttputc('Y');
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ttputc(row+BIAS);
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ttputc(col+BIAS);
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}
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vt52eeol()
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{
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ttputc(ESC);
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ttputc('K');
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}
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vt52eeop()
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{
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ttputc(ESC);
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ttputc('J');
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}
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vt52beep()
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{
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#ifdef BEL
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ttputc(BEL);
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ttflush();
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#endif
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}
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#endif
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vt52open()
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{
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#if V7
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register char *cp;
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char *getenv();
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if ((cp = getenv("TERM")) == NULL) {
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puts("Shell variable TERM not defined!");
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exit(1);
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}
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if (strcmp(cp, "vt52") != 0 && strcmp(cp, "z19") != 0) {
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puts("Terminal type not 'vt52'or 'z19' !");
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exit(1);
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}
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#endif
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ttopen();
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}
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