summaryrefslogtreecommitdiffstats
path: root/sys/teken/teken.c
blob: 8834390dec4960443c0308b60854f1d3aa45b20a (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
566
/*-
 * Copyright (c) 2008-2009 Ed Schouten <ed@FreeBSD.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $FreeBSD$
 */

#include <sys/cdefs.h>
#if defined(__FreeBSD__) && defined(_KERNEL)
#include <sys/param.h>
#include <sys/limits.h>
#include <sys/lock.h>
#include <sys/systm.h>
#define	teken_assert(x)		MPASS(x)
#else /* !(__FreeBSD__ && _KERNEL) */
#include <sys/types.h>
#include <assert.h>
#include <limits.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#define	teken_assert(x)		assert(x)
#endif /* __FreeBSD__ && _KERNEL */

/* debug messages */
#define	teken_printf(x,...)

/* Private flags for t_stateflags. */
#define	TS_FIRSTDIGIT	0x0001	/* First numeric digit in escape sequence. */
#define	TS_INSERT	0x0002	/* Insert mode. */
#define	TS_AUTOWRAP	0x0004	/* Autowrap. */
#define	TS_ORIGIN	0x0008	/* Origin mode. */
#define	TS_WRAPPED	0x0010	/* Next character should be printed on col 0. */
#define	TS_8BIT		0x0020	/* UTF-8 disabled. */
#define	TS_CONS25	0x0040	/* cons25 emulation. */
#define	TS_INSTRING	0x0080	/* Inside string. */
#define	TS_CURSORKEYS	0x0100	/* Cursor keys mode. */

/* Character that blanks a cell. */
#define	BLANK	' '

#include "teken.h"
#include "teken_wcwidth.h"
#include "teken_scs.h"

static teken_state_t	teken_state_init;

/*
 * Wrappers for hooks.
 */

static inline void
teken_funcs_bell(teken_t *t)
{

	t->t_funcs->tf_bell(t->t_softc);
}

static inline void
teken_funcs_cursor(teken_t *t)
{

	teken_assert(t->t_cursor.tp_row < t->t_winsize.tp_row);
	teken_assert(t->t_cursor.tp_col < t->t_winsize.tp_col);

	t->t_funcs->tf_cursor(t->t_softc, &t->t_cursor);
}

static inline void
teken_funcs_putchar(teken_t *t, const teken_pos_t *p, teken_char_t c,
    const teken_attr_t *a)
{

	teken_assert(p->tp_row < t->t_winsize.tp_row);
	teken_assert(p->tp_col < t->t_winsize.tp_col);

	t->t_funcs->tf_putchar(t->t_softc, p, c, a);
}

static inline void
teken_funcs_fill(teken_t *t, const teken_rect_t *r,
    const teken_char_t c, const teken_attr_t *a)
{

	teken_assert(r->tr_end.tp_row > r->tr_begin.tp_row);
	teken_assert(r->tr_end.tp_row <= t->t_winsize.tp_row);
	teken_assert(r->tr_end.tp_col > r->tr_begin.tp_col);
	teken_assert(r->tr_end.tp_col <= t->t_winsize.tp_col);

	t->t_funcs->tf_fill(t->t_softc, r, c, a);
}

static inline void
teken_funcs_copy(teken_t *t, const teken_rect_t *r, const teken_pos_t *p)
{

	teken_assert(r->tr_end.tp_row > r->tr_begin.tp_row);
	teken_assert(r->tr_end.tp_row <= t->t_winsize.tp_row);
	teken_assert(r->tr_end.tp_col > r->tr_begin.tp_col);
	teken_assert(r->tr_end.tp_col <= t->t_winsize.tp_col);
	teken_assert(p->tp_row + (r->tr_end.tp_row - r->tr_begin.tp_row) <= t->t_winsize.tp_row);
	teken_assert(p->tp_col + (r->tr_end.tp_col - r->tr_begin.tp_col) <= t->t_winsize.tp_col);

	t->t_funcs->tf_copy(t->t_softc, r, p);
}

static inline void
teken_funcs_param(teken_t *t, int cmd, unsigned int value)
{

	t->t_funcs->tf_param(t->t_softc, cmd, value);
}

static inline void
teken_funcs_respond(teken_t *t, const void *buf, size_t len)
{

	t->t_funcs->tf_respond(t->t_softc, buf, len);
}

#include "teken_subr.h"
#include "teken_subr_compat.h"

/*
 * Programming interface.
 */

void
teken_init(teken_t *t, const teken_funcs_t *tf, void *softc)
{
	teken_pos_t tp = { .tp_row = 24, .tp_col = 80 };

	t->t_funcs = tf;
	t->t_softc = softc;

	t->t_nextstate = teken_state_init;
	t->t_stateflags = 0;
	t->t_utf8_left = 0;

	t->t_defattr.ta_format = 0;
	t->t_defattr.ta_fgcolor = TC_WHITE;
	t->t_defattr.ta_bgcolor = TC_BLACK;
	teken_subr_do_reset(t);

	teken_set_winsize(t, &tp);
}

static void
teken_input_char(teken_t *t, teken_char_t c)
{

	/*
	 * There is no support for DCS and OSC.  Just discard strings
	 * until we receive characters that may indicate string
	 * termination.
	 */
	if (t->t_stateflags & TS_INSTRING) {
		switch (c) {
		case '\x1B':
			t->t_stateflags &= ~TS_INSTRING;
			break;
		case '\a':
			t->t_stateflags &= ~TS_INSTRING;
			return;
		default:
			return;
		}
	}

	switch (c) {
	case '\0':
		break;
	case '\a':
		teken_subr_bell(t);
		break;
	case '\b':
		teken_subr_backspace(t);
		break;
	case '\n':
	case '\x0B':
		teken_subr_newline(t);
		break;
	case '\x0C':
		teken_subr_newpage(t);
		break;
	case '\x0E':
		if (t->t_stateflags & TS_CONS25)
			t->t_nextstate(t, c);
		else
			t->t_curscs = 1;
		break;
	case '\x0F':
		if (t->t_stateflags & TS_CONS25)
			t->t_nextstate(t, c);
		else
			t->t_curscs = 0;
		break;
	case '\r':
		teken_subr_carriage_return(t);
		break;
	case '\t':
		teken_subr_horizontal_tab(t);
		break;
	default:
		t->t_nextstate(t, c);
		break;
	}

	/* Post-processing assertions. */
	teken_assert(t->t_cursor.tp_row >= t->t_originreg.ts_begin);
	teken_assert(t->t_cursor.tp_row < t->t_originreg.ts_end);
	teken_assert(t->t_cursor.tp_row < t->t_winsize.tp_row);
	teken_assert(t->t_cursor.tp_col < t->t_winsize.tp_col);
	teken_assert(t->t_saved_cursor.tp_row < t->t_winsize.tp_row);
	teken_assert(t->t_saved_cursor.tp_col < t->t_winsize.tp_col);
	teken_assert(t->t_scrollreg.ts_end <= t->t_winsize.tp_row);
	teken_assert(t->t_scrollreg.ts_begin < t->t_scrollreg.ts_end);
	/* Origin region has to be window size or the same as scrollreg. */
	teken_assert((t->t_originreg.ts_begin == t->t_scrollreg.ts_begin &&
	    t->t_originreg.ts_end == t->t_scrollreg.ts_end) ||
	    (t->t_originreg.ts_begin == 0 &&
	    t->t_originreg.ts_end == t->t_winsize.tp_row));
}

static void
teken_input_byte(teken_t *t, unsigned char c)
{

	/*
	 * UTF-8 handling.
	 */
	if ((c & 0x80) == 0x00 || t->t_stateflags & TS_8BIT) {
		/* One-byte sequence. */
		t->t_utf8_left = 0;
		teken_input_char(t, c);
	} else if ((c & 0xe0) == 0xc0) {
		/* Two-byte sequence. */
		t->t_utf8_left = 1;
		t->t_utf8_partial = c & 0x1f;
	} else if ((c & 0xf0) == 0xe0) {
		/* Three-byte sequence. */
		t->t_utf8_left = 2;
		t->t_utf8_partial = c & 0x0f;
	} else if ((c & 0xf8) == 0xf0) {
		/* Four-byte sequence. */
		t->t_utf8_left = 3;
		t->t_utf8_partial = c & 0x07;
	} else if ((c & 0xc0) == 0x80) {
		if (t->t_utf8_left == 0)
			return;
		t->t_utf8_left--;
		t->t_utf8_partial = (t->t_utf8_partial << 6) | (c & 0x3f);
		if (t->t_utf8_left == 0) {
			teken_printf("Got UTF-8 char %x\n", t->t_utf8_partial);
			teken_input_char(t, t->t_utf8_partial);
		}
	}
}

void
teken_input(teken_t *t, const void *buf, size_t len)
{
	const char *c = buf;

	while (len-- > 0)
		teken_input_byte(t, *c++);
}

const teken_pos_t *
teken_get_cursor(teken_t *t)
{

	return (&t->t_cursor);
}

void
teken_set_cursor(teken_t *t, const teken_pos_t *p)
{

	/* XXX: bounds checking with originreg! */
	teken_assert(p->tp_row < t->t_winsize.tp_row);
	teken_assert(p->tp_col < t->t_winsize.tp_col);

	t->t_cursor = *p;
}

const teken_attr_t *
teken_get_curattr(teken_t *t)
{

	return (&t->t_curattr);
}

void
teken_set_curattr(teken_t *t, const teken_attr_t *a)
{

	t->t_curattr = *a;
}

const teken_attr_t *
teken_get_defattr(teken_t *t)
{

	return (&t->t_defattr);
}

void
teken_set_defattr(teken_t *t, const teken_attr_t *a)
{

	t->t_curattr = t->t_saved_curattr = t->t_defattr = *a;
}

const teken_pos_t *
teken_get_winsize(teken_t *t)
{

	return (&t->t_winsize);
}

static void
teken_trim_cursor_pos(teken_t *t, const teken_pos_t *new)
{
	const teken_pos_t *cur;

	cur = &t->t_winsize;

	if (cur->tp_row < new->tp_row || cur->tp_col < new->tp_col)
		return;
	if (t->t_cursor.tp_row >= new->tp_row)
		t->t_cursor.tp_row = new->tp_row - 1;
	if (t->t_cursor.tp_col >= new->tp_col)
		t->t_cursor.tp_col = new->tp_col - 1;
}

void
teken_set_winsize(teken_t *t, const teken_pos_t *p)
{

	teken_trim_cursor_pos(t, p);
	t->t_winsize = *p;
	teken_subr_do_reset(t);
}

void
teken_set_winsize_noreset(teken_t *t, const teken_pos_t *p)
{

	teken_trim_cursor_pos(t, p);
	t->t_winsize = *p;
	teken_subr_do_resize(t);
}

void
teken_set_8bit(teken_t *t)
{

	t->t_stateflags |= TS_8BIT;
}

void
teken_set_cons25(teken_t *t)
{

	t->t_stateflags |= TS_CONS25;
}

/*
 * State machine.
 */

static void
teken_state_switch(teken_t *t, teken_state_t *s)
{

	t->t_nextstate = s;
	t->t_curnum = 0;
	t->t_stateflags |= TS_FIRSTDIGIT;
}

static int
teken_state_numbers(teken_t *t, teken_char_t c)
{

	teken_assert(t->t_curnum < T_NUMSIZE);

	if (c >= '0' && c <= '9') {
		if (t->t_stateflags & TS_FIRSTDIGIT) {
			/* First digit. */
			t->t_stateflags &= ~TS_FIRSTDIGIT;
			t->t_nums[t->t_curnum] = c - '0';
		} else if (t->t_nums[t->t_curnum] < UINT_MAX / 100) {
			/*
			 * There is no need to continue parsing input
			 * once the value exceeds the size of the
			 * terminal. It would only allow for integer
			 * overflows when performing arithmetic on the
			 * cursor position.
			 *
			 * Ignore any further digits if the value is
			 * already UINT_MAX / 100.
			 */
			t->t_nums[t->t_curnum] =
			    t->t_nums[t->t_curnum] * 10 + c - '0';
		}
		return (1);
	} else if (c == ';') {
		if (t->t_stateflags & TS_FIRSTDIGIT)
			t->t_nums[t->t_curnum] = 0;

		/* Only allow a limited set of arguments. */
		if (++t->t_curnum == T_NUMSIZE) {
			teken_state_switch(t, teken_state_init);
			return (1);
		}

		t->t_stateflags |= TS_FIRSTDIGIT;
		return (1);
	} else {
		if (t->t_stateflags & TS_FIRSTDIGIT && t->t_curnum > 0) {
			/* Finish off the last empty argument. */
			t->t_nums[t->t_curnum] = 0;
			t->t_curnum++;
		} else if ((t->t_stateflags & TS_FIRSTDIGIT) == 0) {
			/* Also count the last argument. */
			t->t_curnum++;
		}
	}

	return (0);
}

teken_color_t
teken_256to8(teken_color_t c)
{
	unsigned int r, g, b;

	if (c < 16) {
		/* Traditional color indices. */
		return (c % 8);
	} else if (c >= 244) {
		/* Upper grayscale colors. */
		return (TC_WHITE);
	} else if (c >= 232) {
		/* Lower grayscale colors. */
		return (TC_BLACK);
	}

	/* Convert to RGB. */
	c -= 16;
	b = c % 6;
	g = (c / 6) % 6;
	r = c / 36;

	if (r < g) {
		/* Possibly green. */
		if (g < b)
			return (TC_BLUE);
		else if (g > b)
			return (TC_GREEN);
		else
			return (TC_CYAN);
	} else if (r > g) {
		/* Possibly red. */
		if (r < b)
			return (TC_BLUE);
		else if (r > b)
			return (TC_RED);
		else
			return (TC_MAGENTA);
	} else {
		/* Possibly brown. */
		if (g < b)
			return (TC_BLUE);
		else if (g > b)
			return (TC_BROWN);
		else if (r < 3)
			return (TC_BLACK);
		else
			return (TC_WHITE);
	}
}

static const char * const special_strings_cons25[] = {
	[TKEY_UP] = "\x1B[A",		[TKEY_DOWN] = "\x1B[B",
	[TKEY_LEFT] = "\x1B[D",		[TKEY_RIGHT] = "\x1B[C",

	[TKEY_HOME] = "\x1B[H",		[TKEY_END] = "\x1B[F",
	[TKEY_INSERT] = "\x1B[L",	[TKEY_DELETE] = "\x7F",
	[TKEY_PAGE_UP] = "\x1B[I",	[TKEY_PAGE_DOWN] = "\x1B[G",

	[TKEY_F1] = "\x1B[M",		[TKEY_F2] = "\x1B[N",
	[TKEY_F3] = "\x1B[O",		[TKEY_F4] = "\x1B[P",
	[TKEY_F5] = "\x1B[Q",		[TKEY_F6] = "\x1B[R",
	[TKEY_F7] = "\x1B[S",		[TKEY_F8] = "\x1B[T",
	[TKEY_F9] = "\x1B[U",		[TKEY_F10] = "\x1B[V",
	[TKEY_F11] = "\x1B[W",		[TKEY_F12] = "\x1B[X",
};

static const char * const special_strings_ckeys[] = {
	[TKEY_UP] = "\x1BOA",		[TKEY_DOWN] = "\x1BOB",
	[TKEY_LEFT] = "\x1BOD",		[TKEY_RIGHT] = "\x1BOC",

	[TKEY_HOME] = "\x1BOH",		[TKEY_END] = "\x1BOF",
};

static const char * const special_strings_normal[] = {
	[TKEY_UP] = "\x1B[A",		[TKEY_DOWN] = "\x1B[B",
	[TKEY_LEFT] = "\x1B[D",		[TKEY_RIGHT] = "\x1B[C",

	[TKEY_HOME] = "\x1B[H",		[TKEY_END] = "\x1B[F",
	[TKEY_INSERT] = "\x1B[2~",	[TKEY_DELETE] = "\x1B[3~",
	[TKEY_PAGE_UP] = "\x1B[5~",	[TKEY_PAGE_DOWN] = "\x1B[6~",

	[TKEY_F1] = "\x1BOP",		[TKEY_F2] = "\x1BOQ",
	[TKEY_F3] = "\x1BOR",		[TKEY_F4] = "\x1BOS",
	[TKEY_F5] = "\x1B[15~",		[TKEY_F6] = "\x1B[17~",
	[TKEY_F7] = "\x1B[18~",		[TKEY_F8] = "\x1B[19~",
	[TKEY_F9] = "\x1B[20~",		[TKEY_F10] = "\x1B[21~",
	[TKEY_F11] = "\x1B[23~",	[TKEY_F12] = "\x1B[24~",
};

const char *
teken_get_sequence(teken_t *t, unsigned int k)
{

	/* Cons25 mode. */
	if (t->t_stateflags & TS_CONS25 &&
	    k < sizeof special_strings_cons25 / sizeof(char *))
		return (special_strings_cons25[k]);

	/* Cursor keys mode. */
	if (t->t_stateflags & TS_CURSORKEYS &&
	    k < sizeof special_strings_ckeys / sizeof(char *))
		return (special_strings_ckeys[k]);

	/* Default xterm sequences. */
	if (k < sizeof special_strings_normal / sizeof(char *))
		return (special_strings_normal[k]);

	return (NULL);
}

#include "teken_state.h"
OpenPOWER on IntegriCloud