557 lines
15 KiB
Plaintext
557 lines
15 KiB
Plaintext
//
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// VT52.mm
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// 2Term
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//
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// Created by Kelvin Sherlock on 7/7/2010.
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// Copyright 2010 __MyCompanyName__. All rights reserved.
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//
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#include <sys/ttydefaults.h>
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#include <cctype>
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#import "VT52.h"
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#include "OutputChannel.h"
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#include "Screen.h"
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enum {
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StateText,
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StateEsc,
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StateDCAY,
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StateDCAX
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};
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/*
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* TODO -- the VT50x are 12 rows but double spaced.
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*
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*
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*/
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// VT52 is 24 x 80 upper/lowercase.
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// 50/50H is 12 * 80, uppercase only. H has a keypad.
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// The 50s only display/transmit uppercase characters and lack `~ {} characters on the keypad.
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// VT55 is a VT52 with extra graphic display capabilites.
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enum {
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ModelVT52,
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ModelVT50H,
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ModelVT50,
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ModelVT55
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};
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#define ESC "\x1b"
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@implementation VT52
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+(void)load
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{
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[EmulatorManager registerClass: self];
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}
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+(NSString *)name
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{
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return @"VT52";
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}
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-(NSString *)name
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{
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switch (_model)
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{
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case ModelVT50:
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return @"VT50";
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case ModelVT50H:
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return @"VT50H";
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case ModelVT55:
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return @"VT55";
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case ModelVT52:
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default:
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return @"VT52";
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}
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}
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-(const char *)termName
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{
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switch (_model)
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{
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case ModelVT50:
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return "vt50";
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case ModelVT50H:
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return "vt50h";
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case ModelVT55:
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return "vt55";
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case ModelVT52:
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default:
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return "vt52";
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}
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}
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-(void)keyDown: (NSEvent *)event screen: (Screen *)screen output: (OutputChannel *)output
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{
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unsigned flags = [event modifierFlags];
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NSString *chars = [event charactersIgnoringModifiers];
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unsigned length = [chars length];
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for (unsigned i = 0; i < length; ++i)
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{
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unichar uc = [chars characterAtIndex: i];
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uint8_t c;
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if (flags & NSNumericPadKeyMask)
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{
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if (_altKeyPad)
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{
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const char *str = NULL;
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switch (uc)
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{
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case '0':
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str = ESC "?p";
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break;
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case '1':
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str = ESC "?q";
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break;
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case '2':
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str = ESC "?r";
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break;
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case '3':
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str = ESC "?s";
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break;
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case '4':
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str = ESC "?t";
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break;
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case '5':
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str = ESC "?u";
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break;
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case '6':
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str = ESC "?v";
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break;
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case '7':
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str = ESC "?w";
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break;
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case '8':
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str = ESC "?x";
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break;
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case '9':
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str = ESC "?y";
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break;
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case '.':
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str = ESC "?n";
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break;
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case NSNewlineCharacter: //?
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case NSEnterCharacter:
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str = ESC "?M";
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break;
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}
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if (str)
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{
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output->write(str);
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break;
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}
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}
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}
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switch (uc)
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{
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case NSEnterCharacter:
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output->write('\r');
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break;
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case NSDeleteCharacter:
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output->write(0x7f);
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break;
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case NSUpArrowFunctionKey:
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output->write(ESC "A");
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break;
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case NSDownArrowFunctionKey:
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output->write(ESC "B");
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break;
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case NSRightArrowFunctionKey:
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output->write(ESC "C");
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break;
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case NSLeftArrowFunctionKey:
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output->write(ESC "D");
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break;
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// 3 function keys. (VT50H / VT52)
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case NSF1FunctionKey:
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output->write(ESC "P");
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break;
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case NSF2FunctionKey:
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output->write(ESC "Q");
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break;
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case NSF3FunctionKey:
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output->write(ESC "R");
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break;
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default:
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if (uc > 0x7f) break;
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c = uc;
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if (flags & NSControlKeyMask)
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{
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c = CTRL(c);
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}
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output->write(c);
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break;
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}
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}
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}
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-(void)reset
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{
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_state = StateText;
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}
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-(void)processCharacter: (uint8_t)c screen: (Screen *)screen output: (OutputChannel *)output
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{
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switch (_state)
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{
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case StateEsc:
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{
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switch (c)
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{
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case 0x00:
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case 0x7f:
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// filler.
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break;
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case 0x1b:
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/*
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* If the VT50 or VT50H receives ESC ESC from the host, the second ESC will cancel the Escape Sequence ...
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* If the VT52 receies ESC ESC, it will still be prepared to interpret rather than display the next displayable character.
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*/
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switch (_model) {
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case ModelVT50:
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case ModelVT50H:
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_state = StateText;
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break;
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}
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break;
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// cursor control.
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case 'A':
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/* cursor up */
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screen->decrementY();
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_state = StateText;
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break;
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case 'C':
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/* cursor right */
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screen->incrementX();
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_state = StateText;
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break;
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case 'B':
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/* cursor down (not on VT50) */
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if (_model != ModelVT50)
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screen->incrementY();
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_state = StateText;
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break;
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case 'D':
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/* cursor left (not on the VT50) */
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if (_model != ModelVT50)
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screen->decrementX();
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_state = StateText;
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break;
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case 'H':
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/* home */
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screen->setCursor(0, 0);
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_state = StateText;
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break;
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case 'Y':
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/* direct cursor addressing (not on the VT50) */
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if (_model == ModelVT50)
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{
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_state = StateText;
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}
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else
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{
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_state = StateDCAY;
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}
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break;
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case 'I':
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// reverse line feed
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switch (_model) {
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case ModelVT52:
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case ModelVT55:
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screen->reverseLineFeed();
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break;
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}
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_state = StateText;
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break;
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// erasing
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case 'K':
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// erase to end of line
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screen->eraseLine();
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_state = StateText;
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break;
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case 'J':
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// erase to end of screen.
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screen->eraseScreen();
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_state = StateText;
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break;
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// alternate keypad mode
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case '=':
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switch (_model) {
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case ModelVT52:
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case ModelVT55:
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_altKeyPad = YES;
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break;
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}
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_state = StateText;
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break;
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case '>':
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switch (_model) {
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case ModelVT52:
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case ModelVT55:
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_altKeyPad = NO;
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break;
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}
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_state = StateText;
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break;
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// graphics.
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case 'F':
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switch (_model) {
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case ModelVT52:
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case ModelVT55:
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_graphics = YES;
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break;
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}
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_state = StateText;
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break;
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case 'G':
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switch (_model) {
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case ModelVT52:
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case ModelVT55:
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_graphics = NO;
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break;
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}
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_state = StateText;
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break;
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case 'Z':
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// identify terminal.
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// NB -- these indicate no copier.
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switch(_model) {
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case ModelVT50:
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output->write(ESC "/A");
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break;
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case ModelVT50H:
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output->write(ESC "/H");
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break;
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case ModelVT52:
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output->write(ESC "/K");
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break;
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case ModelVT55:
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output->write(ESC "/C"); // E?
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break;
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}
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break;
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// hold screen unsupported.
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// ESC 1 -- (VT55) -- enter graph drawing
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// ESC 2 -- (VT55) -- exit graph drawing
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default:
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std::fprintf(stderr, "Unrecognized escape sequence: %02x (%c)\n", (int)c, c);
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_state = StateText;
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break;
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}
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break;
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}
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case StateDCAY:
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{
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if (c == 0x00) break;
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_dca.y = c - 0x20;
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_state = StateDCAX;
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break;
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}
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case StateDCAX:
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{
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if (c == 0x00) break;
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_dca.x = c - 0x20;
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/*
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* If the line # does not specify a line that exists on the screen, the VT50H
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* will move the cursor to the bottom line of the screen. However, the VT52 will
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* not move the cursor vertically if the vertical parameter is out of bounds.
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*/
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/*
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* If the column number is greater than 157 and, therefore, does not specify a column
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* that exists on the screen, the cursor is moved to the rightmost column on a line on all models.
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*/
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screen->setCursor(_dca, true, _model == ModelVT50H);
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_state = StateText;
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break;
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}
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case StateText:
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{
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switch(c)
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{
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case 0x00:
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case 0x7f:
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// filler
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break;
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case 0x1b:
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_state = StateEsc;
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break;
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case 0x07:
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NSBeep();
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break;
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case 0x08:
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// backspace
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screen->decrementX();
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break;
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case 0x09:
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[self tab: screen];
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break;
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case 0x0a:
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screen->lineFeed();
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break;
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case 0x0d:
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screen->setX(0);
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break;
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case 0x0e:
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// VT52H only -- backwards compatability with the VT05.
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if (_model == ModelVT50H)
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_state = StateDCAY;
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break;
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default:
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if (c >= 0x20 && c < 0x7f)
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{
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// VT50x cannot display anything in the range 0140--0176
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if (c >= 0140 && (_model == ModelVT50 || _model == ModelVT50H))
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c -= 040;
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screen->putc(c);
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}
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break;
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}
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break;
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}
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}
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}
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-(void)tab: (Screen *)screen
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{
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/*
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* TAB (011_8) causes the cursor to move right to the next TAB stop each time the TAB code is received.
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* TAB stops are preset eight character spaces apart. TAB stop locations are at characters positions 1, 9,
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* 17, 25, 33, 41, 49, 57, and 65. Once the cursor reaches character position 65, all TAB commands
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* received thereafter will cause the cursor to move only one character position. Once the cursor reaches
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* character position 72, receipt of the the TAB code has no effect.
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*/
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int x = screen->x();
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if (x >= screen->width() - 8)
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{
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screen->setX(x + 1);
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}
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else
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{
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screen->setX((x + 8) & ~7);
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}
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}
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-(BOOL)resizable
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{
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switch (_model)
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{
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case ModelVT52:
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case ModelVT55:
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return YES;
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default:
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return NO;
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}
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}
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-(struct winsize)defaultSize
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{
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struct winsize ws = { 0, 0, 0, 0};
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// TODO -- although VT50x have 12 rows, they are double spaced.
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switch (_model)
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{
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case ModelVT52:
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case ModelVT55:
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ws.ws_row = 24;
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ws.ws_col = 80;
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break;
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default:
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ws.ws_row = 12;
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ws.ws_col = 80;
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break;
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}
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return ws;
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}
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@end
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