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-rw-r--r--mbbsd/vtkbd.c279
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diff --git a/mbbsd/vtkbd.c b/mbbsd/vtkbd.c
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-/*
- * vtkbd.c
- * Virtual Terminal Keyboard
- *
- * piaip's new re-implementation of xterm/VT100/220/ANSI key input
- * escape sequence parser for BBS
- *
- * Author: Hung-Te Lin (piaip)
- * Create: Wed Sep 23 15:06:43 CST 2009
- * ---------------------------------------------------------------------------
- * Copyright (c) 2009 Hung-Te Lin <piaip@csie.org>
- * All rights reserved.
- * Distributed under BSD license (GPL compatible).
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * * Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * ---------------------------------------------------------------------------
- * References:
- * http://support.dell.com/support/edocs/systems/pe2650/en/ug/5g387ad0.htm
- * http://aperiodic.net/phil/archives/Geekery/term-function-keys.html
- * http://publib.boulder.ibm.com/infocenter/iseries/v5r3/index.jsp?topic=/rzaiw/rzaiwvt220opmode.htm
- * http://www.rebol.com/docs/core23/rebolcore-18.html
- * http://ascii-table.com/ansi-escape-sequences-vt-100.php
- * http://web.mit.edu/gnu/doc/html/screen_10.html
- * http://vt100.net/docs/vt220-rm/chapter3.html
- * http://inwap.com/pdp10/ansicode.txt
- * http://www.connectrf.com/Documents/vt220.html
- * http://www.ibb.net/~anne/keyboard.html
- * http://invisible-island.net/xterm/ctlseqs/ctlseqs.html
- * PuTTY Source < terminal.c, term_key() >
- * Termcap
- * ---------------------------------------------------------------------------
- * * BS/DEL Rules
- * The BackSpace, Erase(<X]), and Delete keys are special due to history...
- * - on vt220, BS=0x7F, Delete=ESC[3~ (screen/xterm/PuTTY)
- * - on vt100, BS=0x7F
- * - on vt100/xterm, BS=0x08, Delete=0x7F (Windows/VMX/DOS telnet)
- * So we define
- * KEY_BS = BACKSPACE/ERASE = 0x08, 0x7F
- * KEY_DEL = DELETE = ESC[3~
- *
- * * CR/LF Rules
- * The traditional newline maps to following combination...
- * - UNIX, LF
- * - Win, CR+LF
- * - Mac, CR
- * When it comes to terminal,CR LF should be treated as one.
- * There were reports that some users getting double ENTERs if we take LF
- * as ENTER, so we decided reject LF. We are not sure if there is any
- * clients sending LF only, but according the the compatibility test,
- * most modern clients send only CR (or CR+LF).
- * So we define
- * KEY_CR = CR, CR+LF
- * KEY_LF = ignored.
- * ---------------------------------------------------------------------------
- * * The complete list to support:
- * - Up/Down/Right/Left: <Esc> [ <A-D> | <Esc> O <A-D> (app)
- * - Home/Ins/Del/End/PgUp/PgDn: <Esc> [ <1~6> ~
- * - Shift-TAB: <Esc> [ Z | <Esc> [ 0 Z
- * - F1~F4: <Esc> [ 1 <1234> ~ | <Esc> O <PQRS>
- * - F5: <Esc> [ 1 <5> ~
- * - F6-F8: <Esc> [ 1 <789> ~
- * - F9-F12: <Esc> [ 2 <0134> ~
- * - Num 0-9 *+,-./=ENTER: <Esc> O <pqrstuvwxyjklmnoXM>
- *
- * Note: we don't support some rare terms like <Esc> O <TUVWXYZA> described
- * in Dell 2650 in order to prevent confusion.
- * Num pad is also always converted to digits.
- */
-
-#include "bbs.h"
-
-/* VtkbdCtx.state */
-typedef enum {
- VKSTATE_NORMAL = 0,
- VKSTATE_ESC, // <Esc>
- VKSTATE_ESC_APP, // <Esc> O
- VKSTATE_ESC_QUOTE, // <Esc> [
- VKSTATE_ZERO, // <Esc> [ 0 (wait Z)
- VKSTATE_ONE, // <Esc> [ <1>
- VKSTATE_TWO, // <Esc> [ <2>
- VKSTATE_TLIDE, // <Esc> [ * (wait ~, return esc_arg)
-} VKSTATES;
-
-/* the processor API */
-int
-vtkbd_process(int c, VtkbdCtx *ctx)
-{
- switch (ctx->state)
- {
- case VKSTATE_NORMAL: // original state
- if (c == KEY_ESC)
- {
- ctx->state = VKSTATE_ESC;
- return KEY_INCOMPLETE;
- }
-
- // simple mappings
- switch (c) {
- // BS/ERASE/DEL Rules
- case 0x7F:
- case 0x08:
- return KEY_BS;
- }
- return c;
-
- case VKSTATE_ESC: // <Esc>
- switch (c) {
- case '[':
- ctx->state = VKSTATE_ESC_QUOTE;
- return KEY_INCOMPLETE;
-
- case 'O':
- ctx->state = VKSTATE_ESC_APP;
- return KEY_INCOMPLETE;
-
- case '0':
- ctx->state = VKSTATE_ZERO;
- return KEY_INCOMPLETE;
- }
-
- // XXX should we map this into another section of KEY_ESC_* ?
- ctx->esc_arg = c;
- ctx->state = VKSTATE_NORMAL;
- return KEY_ESC;
-
- case VKSTATE_ZERO: // <Esc> 0
- if (c != 'Z')
- break;
-
- ctx->state = VKSTATE_NORMAL;
- return KEY_STAB;
-
- case VKSTATE_ESC_APP: // <Esc> O
-
- switch (c) {
- case 'A':
- case 'B':
- case 'C':
- case 'D':
- ctx->state = VKSTATE_NORMAL;
- return KEY_UP + (c - 'A');
-
- case 'P':
- case 'Q':
- case 'R':
- case 'S':
- ctx->state = VKSTATE_NORMAL;
- return KEY_F1 + (c - 'P');
-
- // Num pads: always convert to NumLock=ON
- case 'p': case 'q': case 'r': case 's':
- case 't': case 'u': case 'v': case 'w':
- case 'x': case 'y':
- ctx->state = VKSTATE_NORMAL;
- return '0' + (c - 'p');
-
- case 'M':
- ctx->state = VKSTATE_NORMAL;
- return KEY_ENTER;
-
- case 'X':
- ctx->state = VKSTATE_NORMAL;
- return '=';
-
- case 'j': case 'k': case 'l': case 'm':
- case 'n': case 'o':
- {
- static const char *numx = "*+,-./";
- assert( c >= 'j' && (c-'j') < strlen(numx));
- ctx->state = VKSTATE_NORMAL;
- return numx[c-'j'];
- }
- }
- break;
-
- case VKSTATE_ESC_QUOTE: // <Esc> [
-
- switch(c) {
- case 'A':
- case 'B':
- case 'C':
- case 'D':
- ctx->state = VKSTATE_NORMAL;
- return KEY_UP + (c - 'A');
-
- case '3':
- case '4':
- case '5':
- case '6':
- ctx->state = VKSTATE_TLIDE;
- ctx->esc_arg = KEY_DEL + (c - '3');
- return KEY_INCOMPLETE;
-
- case 'Z':
- ctx->state = VKSTATE_NORMAL;
- return KEY_STAB;
-
- case '1':
- ctx->state = VKSTATE_ONE;
- return KEY_INCOMPLETE;
- case '2':
- ctx->state = VKSTATE_TWO;
- return KEY_INCOMPLETE;
- }
- break;
-
- case VKSTATE_ONE: // <Esc> [ 1
- if (c == '~')
- {
- ctx->state = VKSTATE_NORMAL;
- return KEY_HOME;
- }
-
- switch(c) {
- case '1':
- case '2':
- case '3':
- case '4':
- case '5':
- ctx->state = VKSTATE_TLIDE;
- ctx->esc_arg = KEY_F1 + c - '1'; // F1 .. F5
- return KEY_INCOMPLETE;
-
- case '7':
- case '8':
- case '9':
- ctx->state = VKSTATE_TLIDE;
- ctx->esc_arg = KEY_F6 + c - '7'; // F6 .. F8
- return KEY_INCOMPLETE;
- }
- break;
-
- case VKSTATE_TWO: // <Esc> [ 2
- if (c == '~')
- {
- ctx->state = VKSTATE_NORMAL;
- return KEY_INS; // HOME+1
- }
-
- switch(c) {
- case '0':
- case '1':
- ctx->state = VKSTATE_TLIDE;
- ctx->esc_arg = KEY_F9 + c - '0'; // F9 .. F10
- return KEY_INCOMPLETE;
-
- case '3':
- case '4':
- ctx->state = VKSTATE_TLIDE;
- ctx->esc_arg = KEY_F11 + c - '3'; // F11 .. F12
- return KEY_INCOMPLETE;
- }
- break;
-
- case VKSTATE_TLIDE: // Esc [ <12> <0-9> ~
- if (c != '~')
- break;
-
- ctx->state = VKSTATE_NORMAL;
- return ctx->esc_arg;
-
- default:
- assert(!"unknown vkstate");
- break;
- }
-
- // what to do now?
- ctx->state = VKSTATE_NORMAL;
- return KEY_UNKNOWN;
-}
-
-// vim:sw=4:sw=4:et
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