summaryrefslogtreecommitdiff
path: root/pico/osdep/getkey.c
blob: 68ad707c3f18fe7b2451969c1f3504d2dfa8230e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
#if !defined(lint) && !defined(DOS)
static char rcsid[] = "$Id: getkey.c 769 2007-10-24 00:15:40Z hubert@u.washington.edu $";
#endif

/*
 * ========================================================================
 * Copyright 2006-2007 University of Washington
 * Copyright 2013-2014 Eduardo Chappa
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * ========================================================================
 */

#include <system.h>
#include <general.h>

#include "../estruct.h"
#include "../mode.h"
#include "../pico.h"
#include "../edef.h"
#include "../efunc.h"
#include "../keydefs.h"

#include "tty.h"
#include "getkey.h"
#include "read.h"
#include "mouse.h"

#ifdef _WINDOWS
#include "mswin.h"
static int	MapMSKEYtoPK(int c);
#endif /* _WINDOWS */


/* internal declarations */
static int timeo = 0;

/* these next two are declared in pith/conf.h */
int
set_input_timeout(int t)
{
    int oldtimeo = timeo;

    timeo = t;
    return(oldtimeo);
}

int
get_input_timeout(void)
{
    return(timeo);
}


#ifndef _WINDOWS


/* internal prototypes */
void		bail(void);
int		ReadyForKey(int);



void
bail(void)
{
    sleep(30);				/* see if os receives SIGHUP */
    kill(getpid(), SIGHUP);			/* eof or bad error */
}


#if	TYPEAH
/* 
 * typahead - Check to see if any characters are already in the
 *	      keyboard buffer
 */
int
typahead(void)
{
    int x;	/* holds # of pending chars */

    return((ioctl(0,FIONREAD,&x) < 0) ? 0 : x);
}
#endif /* TYPEAH */



/*
 * ReadyForKey - return true if there's no timeout or we're told input
 *		 is available...
 */
int
ReadyForKey(int timeout)
{
    switch(input_ready(timeout)){
      case READY_TO_READ:
	return(1);
	break;

      case NO_OP_COMMAND:
      case NO_OP_IDLE:
      case READ_INTR:
	return(0);

      case BAIL_OUT:
      case PANIC_NOW:
	emlwrite("\007Problem reading from keyboard!", NULL);
	kill(getpid(), SIGHUP);	/* Bomb out (saving our work)! */
	/* no return */
    }

    /* can't happen */
    return(0);
}



/*
 * GetKey - Read in a key.
 * Do the standard keyboard preprocessing. Convert the keys to the internal
 * character set.  Resolves escape sequences and returns no-op if global
 * timeout value exceeded.
 */
UCS
GetKey(void)
{
    UCS ch, status, cc;

    if(!ReadyForKey(FUDGE-5))
      return(NODATA);

    switch(status = kbseq(simple_ttgetc, NULL, bail, input_cs, &ch)){
      case 0: 	/* regular character */
	break;

      case KEY_DOUBLE_ESC:
	/*
	 * Special hack to get around comm devices eating control characters.
	 */
	if(!ReadyForKey(5))
	  return(BADESC);		/* user typed ESC ESC, then stopped */
	else
	    switch(status = kbseq(simple_ttgetc, NULL, bail, input_cs, &ch)){
	      case  KEY_UP		:
	      case  KEY_DOWN		:
	      case  KEY_RIGHT		:
	      case  KEY_LEFT		:
	      case  KEY_PGUP		:
	      case  KEY_PGDN		:
	      case  KEY_HOME		:
	      case  KEY_END		:
	      case  KEY_DEL		:
	      case F1  :
	      case F2  :
	      case F3  :
	      case F4  :
	      case F5  :
	      case F6  :
	      case F7  :
	      case F8  :
	      case F9  :
	      case F10 :
	      case F11 :
	      case F12 :
		return(CTRL | status);
		break;

	      case 0: 	/* regular character */
		break;

	      default:				/* punt the whole thing	*/
		(*term.t_beep)();
		return(BADESC);
		break;
	    }

	ch &= 0x7f;
	if(isdigit((unsigned char)ch)){
	    int n = 0, i = ch - '0';

	    if(i < 0 || i > 2)
	      return(BADESC);		/* bogus literal char value */

	    while(n++ < 2){
		if(!ReadyForKey(5)
		   || (!isdigit((unsigned char) (ch =
				   (*term.t_getchar)(NODATA, NULL, bail)))
		       || (n == 1 && i == 2 && ch > '5')
		       || (n == 2 && i == 25 && ch > '5'))){
		    return(BADESC);
		}

		i = (i * 10) + (ch - '0');
	    }

	    ch = i;
	}
	else{
	    if(islower((unsigned char)ch))	/* canonicalize if alpha */
	      ch = toupper((unsigned char)ch);

	    return((isalpha((unsigned char)ch) || ch == '@'
		    || (ch >= '[' && ch <= '_'))
		    ? (CTRL | ch) : ((ch == ' ') ? (CTRL | '@') : ch));
	}

	break;

#ifdef MOUSE
      case KEY_XTERM_MOUSE:
	{
	    /*
	     * Special hack to get mouse events from an xterm.
	     * Get the details, then pass it past the keymenu event
	     * handler, and then to the installed handler if there
	     * is one...
	     */
	    static int    down = 0;
	    int           x, y, button;
	    unsigned long cmd;

	    button = (*term.t_getchar)(NODATA, NULL, bail) & 0x03;

	    x = (*term.t_getchar)(NODATA, NULL, bail) - '!';
	    y = (*term.t_getchar)(NODATA, NULL, bail) - '!';

	    if(button == 0){
		down = 1;
		if(checkmouse(&cmd, 1, x, y))
		  return((UCS) cmd);
	    }
	    else if(down && button == 3){
		down = 0;
		if(checkmouse(&cmd, 0, x, y))
		  return((UCS) cmd);
	    }

	    return(NODATA);
	}

	break;
#endif /* MOUSE */

      case  KEY_UP		:
      case  KEY_DOWN		:
      case  KEY_RIGHT		:
      case  KEY_LEFT		:
      case  KEY_PGUP		:
      case  KEY_PGDN		:
      case  KEY_HOME		:
      case  KEY_END		:
      case  KEY_DEL		:
      case F1  :
      case F2  :
      case F3  :
      case F4  :
      case F5  :
      case F6  :
      case F7  :
      case F8  :
      case F9  :
      case F10 :
      case F11 :
      case F12 :
	return(status);

      case  CTRL_KEY_UP		:
	return(CTRL | KEY_UP);
      case  CTRL_KEY_DOWN	:
	return(CTRL | KEY_DOWN);
      case  CTRL_KEY_RIGHT	:
	return(CTRL | KEY_RIGHT);
      case  CTRL_KEY_LEFT	:
	return(CTRL | KEY_LEFT);

      case KEY_SWALLOW_Z:
	status = BADESC;
      case KEY_SWAL_UP:
      case KEY_SWAL_DOWN:
      case KEY_SWAL_LEFT:
      case KEY_SWAL_RIGHT:
	do
	  if(!ReadyForKey(2)){
	      status = BADESC;
	      break;
	  }
	while(!strchr("~qz", (*term.t_getchar)(NODATA, NULL, bail)));

	return((status == BADESC)
		? status
		: status - (KEY_SWAL_UP - KEY_UP));
	break;

      case KEY_KERMIT:
	do{
	    cc = ch;
	    if(!ReadyForKey(2))
	      return(BADESC);
	    else
	      ch = (*term.t_getchar)(NODATA, NULL, bail) & 0x7f;
	}while(cc != '\033' && ch != '\\');

	ch = NODATA;
	break;

      case BADESC:
	(*term.t_beep)();
	return(status);

      default:				/* punt the whole thing	*/
	(*term.t_beep)();
	break;
    }

    if (ch >= 0x00 && ch <= 0x1F)       /* C0 control -> C-     */
      ch = CTRL | (ch+'@');

    return(ch);
}


/* 
 * kbseq - looks at an escape sequence coming from the keyboard and 
 *         compares it to a trie of known keyboard escape sequences, and
 *         returns the function bound to the escape sequence.
 * 
 *     Args: getcfunc     -- Function to get a single character from stdin,
 *                           called with the next two arguments to this
 *                           function as its arguments.
 *           recorder     -- If non-NULL, function used to record keystroke.
 *           bail_handler -- Function used to bail out on read error.
 *           c            -- Pointer to returned character.
 *
 *  Returns: BADESC
 *           The escaped function.
 *           0 if a regular char with char stuffed in location c.
 */
UCS
kbseq(int (*getcfunc)(int (*recorder)(int ), void (*bail_handler)(void )),
      int (*recorder)(int),
      void (*bail_handler)(void),
      void *data,
      UCS *ch)
{
    unsigned char c;
    int      first = 1;
    KBESC_T *current;

    current = kbesc;
    if(current == NULL)				/* bag it */
      return(BADESC);

    while(1){
	c = (*getcfunc)(recorder, bail_handler);

	while(current->value != c){
	    if(current->left == NULL){		/* NO MATCH */
		if(first){
		    unsigned long octets_so_far, remaining_octets;
		    unsigned char *inputp;
		    UCS ucs;
		    unsigned char inputbuf[20];

		    /*
		     * Regular character.
		     * Read enough bytes to make up a character and convert it to UCS-4.
		     */
		    memset(inputbuf, 0, sizeof(inputbuf));
		    inputbuf[0] = c;
		    octets_so_far = 1;
		    for(;;){
			remaining_octets = octets_so_far;
			inputp = inputbuf;
			ucs = mbtow(data, &inputp, &remaining_octets);
			switch(ucs){
			  case CCONV_BADCHAR:
			    /*
			     * Not really a BADESC but that ought to
			     * be sufficient. We can add another type if
			     * we need to.
			     */
			    return(BADESC);
			  
			  case CCONV_NEEDMORE:
			    if(octets_so_far >= sizeof(inputbuf))
			      return(BADESC);

			    c = (*getcfunc)(recorder, bail_handler);
			    inputbuf[octets_so_far++] = c;
			    break;

			  default:
			    /* got a good UCS-4 character */
			    *ch = ucs;
			    return(0);
			}
		    }

		    /* NOTREACHED */
		    return(0);
		}
		else
		  return(BADESC);
	    }
	    current = current->left;
	}

	if(current->down == NULL)		/* match!!!*/
	  return(current->func);
	else
	  current = current->down;

	first = 0;
    }
}


#define	newnode()	(KBESC_T *)malloc(sizeof(KBESC_T))

/*
 * kpinsert - insert a keystroke escape sequence into the global search
 *	      structure.
 */
void
kpinsert(char *kstr, int kval, int termcap_wins)
{
    register	char	*buf;
    register	KBESC_T *temp;
    register	KBESC_T *trail;

    if(kstr == NULL)
      return;

    /*
     * Don't allow escape sequences that don't start with ESC unless
     * termcap_wins.  This is to protect against mistakes in termcap files.
     */
    if(!termcap_wins && *kstr != '\033')
      return;

    temp = trail = kbesc;
    buf = kstr;

    for(;;){
	if(temp == NULL){
	    temp = newnode();
	    temp->value = *buf;
	    temp->func = 0;
	    temp->left = NULL;
	    temp->down = NULL;
	    if(kbesc == NULL)
	      kbesc = temp;
	    else
	      trail->down = temp;
	}
	else{				/* first entry */
	    while((temp != NULL) && (temp->value != *buf)){
		trail = temp;
		temp = temp->left;
	    }

	    if(temp == NULL){   /* add new val */
		temp = newnode();
		temp->value = *buf;
		temp->func = 0;
		temp->left = NULL;
		temp->down = NULL;
		trail->left = temp;
	    }
	}

	if(*(++buf) == '\0')
	  break;
	else{
	    /*
	     * Ignore attempt to overwrite shorter existing escape sequence.
	     * That means that sequences with higher priority should be
	     * set up first, so if we want termcap sequences to override
	     * hardwired sequences, put the kpinsert calls for the
	     * termcap sequences first.  (That's what you get if you define
	     * TERMCAP_WINS.)
	     */
	    if(temp->func != 0)
	      return;

	    trail = temp;
	    temp = temp->down;
	}
    }
    
    /*
     * Ignore attempt to overwrite longer sequences we are a prefix
     * of (down != NULL) and exact same sequence (func != 0).
     */
    if(temp != NULL && temp->down == NULL && temp->func == 0)
      temp->func = kval;
}



/*
 * kbdestroy() - kills the key pad function key search tree
 *		 and frees all lines associated with it
 *
 *               Should be called with arg kbesc, the top of the tree.
 */
void
kbdestroy(KBESC_T *kb)
{
    if(kb){
	kbdestroy(kb->left);
	kbdestroy(kb->down);
	free((char *)kb);
	kb = NULL;
    }
}

#else /* _WINDOWS */

/*
 * Read in a key.
 * Do the standard keyboard preprocessing. Convert the keys to the internal
 * character set.  Resolves escape sequences and returns no-op if global
 * timeout value exceeded.
 */
UCS
GetKey(void)
{
    UCS			ch = 0;
    long		timein;
    

    ch = NODATA;
    timein = time(0L);

    /*
     * Main character processing loop.
     */
    while(!mswin_charavail()) {

#ifdef MOUSE
	/* Check Mouse.  If we get a mouse event, convert to char
	 * event and return that. */
	if (checkmouse (&ch,0,0,0)) {
	    curwp->w_flag |= WFHARD;
	    return (ch);
	}
#endif /* MOUSE */


	/* Check Timeout. */
	if(time(0L) >= timein+(FUDGE-10)) 
	    return(NODATA);
    }

    
    return (mswin_getc_fast());
}

#endif /* _WINDOWS */