xref: /freebsd/sys/teken/teken.c (revision c9dbb1cc52b063bbd9ab078a7afc89a8696da659) 
1 /*-
2  * Copyright (c) 2008-2009 Ed Schouten <ed@FreeBSD.org>
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  *
26  * $FreeBSD$
27  */
28 
29 #include <sys/cdefs.h>
30 #if defined(__FreeBSD__) && defined(_KERNEL)
31 #include <sys/param.h>
32 #include <sys/limits.h>
33 #include <sys/lock.h>
34 #include <sys/systm.h>
35 #define	teken_assert(x)		MPASS(x)
36 #else /* !(__FreeBSD__ && _KERNEL) */
37 #include <sys/types.h>
38 #include <assert.h>
39 #include <limits.h>
40 #include <stdint.h>
41 #include <stdio.h>
42 #include <string.h>
43 #define	teken_assert(x)		assert(x)
44 #endif /* __FreeBSD__ && _KERNEL */
45 
46 /* debug messages */
47 #define	teken_printf(x,...)
48 
49 /* Private flags for t_stateflags. */
50 #define	TS_FIRSTDIGIT	0x0001	/* First numeric digit in escape sequence. */
51 #define	TS_INSERT	0x0002	/* Insert mode. */
52 #define	TS_AUTOWRAP	0x0004	/* Autowrap. */
53 #define	TS_ORIGIN	0x0008	/* Origin mode. */
54 #define	TS_WRAPPED	0x0010	/* Next character should be printed on col 0. */
55 #define	TS_8BIT		0x0020	/* UTF-8 disabled. */
56 #define	TS_CONS25	0x0040	/* cons25 emulation. */
57 #define	TS_INSTRING	0x0080	/* Inside string. */
58 #define	TS_CURSORKEYS	0x0100	/* Cursor keys mode. */
59 
60 /* Character that blanks a cell. */
61 #define	BLANK	' '
62 
63 #include "teken.h"
64 #include "teken_wcwidth.h"
65 #include "teken_scs.h"
66 
67 static teken_state_t	teken_state_init;
68 
69 /*
70  * Wrappers for hooks.
71  */
72 
73 static inline void
74 teken_funcs_bell(teken_t *t)
75 {
76 
77 	t->t_funcs->tf_bell(t->t_softc);
78 }
79 
80 static inline void
81 teken_funcs_cursor(teken_t *t)
82 {
83 
84 	teken_assert(t->t_cursor.tp_row < t->t_winsize.tp_row);
85 	teken_assert(t->t_cursor.tp_col < t->t_winsize.tp_col);
86 
87 	t->t_funcs->tf_cursor(t->t_softc, &t->t_cursor);
88 }
89 
90 static inline void
91 teken_funcs_putchar(teken_t *t, const teken_pos_t *p, teken_char_t c,
92     const teken_attr_t *a)
93 {
94 
95 	teken_assert(p->tp_row < t->t_winsize.tp_row);
96 	teken_assert(p->tp_col < t->t_winsize.tp_col);
97 
98 	t->t_funcs->tf_putchar(t->t_softc, p, c, a);
99 }
100 
101 static inline void
102 teken_funcs_fill(teken_t *t, const teken_rect_t *r,
103     const teken_char_t c, const teken_attr_t *a)
104 {
105 
106 	teken_assert(r->tr_end.tp_row > r->tr_begin.tp_row);
107 	teken_assert(r->tr_end.tp_row <= t->t_winsize.tp_row);
108 	teken_assert(r->tr_end.tp_col > r->tr_begin.tp_col);
109 	teken_assert(r->tr_end.tp_col <= t->t_winsize.tp_col);
110 
111 	t->t_funcs->tf_fill(t->t_softc, r, c, a);
112 }
113 
114 static inline void
115 teken_funcs_copy(teken_t *t, const teken_rect_t *r, const teken_pos_t *p)
116 {
117 
118 	teken_assert(r->tr_end.tp_row > r->tr_begin.tp_row);
119 	teken_assert(r->tr_end.tp_row <= t->t_winsize.tp_row);
120 	teken_assert(r->tr_end.tp_col > r->tr_begin.tp_col);
121 	teken_assert(r->tr_end.tp_col <= t->t_winsize.tp_col);
122 	teken_assert(p->tp_row + (r->tr_end.tp_row - r->tr_begin.tp_row) <= t->t_winsize.tp_row);
123 	teken_assert(p->tp_col + (r->tr_end.tp_col - r->tr_begin.tp_col) <= t->t_winsize.tp_col);
124 
125 	t->t_funcs->tf_copy(t->t_softc, r, p);
126 }
127 
128 static inline void
129 teken_funcs_param(teken_t *t, int cmd, unsigned int value)
130 {
131 
132 	t->t_funcs->tf_param(t->t_softc, cmd, value);
133 }
134 
135 static inline void
136 teken_funcs_respond(teken_t *t, const void *buf, size_t len)
137 {
138 
139 	t->t_funcs->tf_respond(t->t_softc, buf, len);
140 }
141 
142 #include "teken_subr.h"
143 #include "teken_subr_compat.h"
144 
145 /*
146  * Programming interface.
147  */
148 
149 void
150 teken_init(teken_t *t, const teken_funcs_t *tf, void *softc)
151 {
152 	teken_pos_t tp = { .tp_row = 24, .tp_col = 80 };
153 
154 	t->t_funcs = tf;
155 	t->t_softc = softc;
156 
157 	t->t_nextstate = teken_state_init;
158 	t->t_stateflags = 0;
159 	t->t_utf8_left = 0;
160 
161 	t->t_defattr.ta_format = 0;
162 	t->t_defattr.ta_fgcolor = TC_WHITE;
163 	t->t_defattr.ta_bgcolor = TC_BLACK;
164 	teken_subr_do_reset(t);
165 
166 	teken_set_winsize(t, &tp);
167 }
168 
169 static void
170 teken_input_char(teken_t *t, teken_char_t c)
171 {
172 
173 	/*
174 	 * There is no support for DCS and OSC.  Just discard strings
175 	 * until we receive characters that may indicate string
176 	 * termination.
177 	 */
178 	if (t->t_stateflags & TS_INSTRING) {
179 		switch (c) {
180 		case '\x1B':
181 			t->t_stateflags &= ~TS_INSTRING;
182 			break;
183 		case '\a':
184 			t->t_stateflags &= ~TS_INSTRING;
185 			return;
186 		default:
187 			return;
188 		}
189 	}
190 
191 	switch (c) {
192 	case '\0':
193 		break;
194 	case '\a':
195 		teken_subr_bell(t);
196 		break;
197 	case '\b':
198 		teken_subr_backspace(t);
199 		break;
200 	case '\n':
201 	case '\x0B':
202 		teken_subr_newline(t);
203 		break;
204 	case '\x0C':
205 		teken_subr_newpage(t);
206 		break;
207 	case '\x0E':
208 		if (t->t_stateflags & TS_CONS25)
209 			t->t_nextstate(t, c);
210 		else
211 			t->t_curscs = 1;
212 		break;
213 	case '\x0F':
214 		if (t->t_stateflags & TS_CONS25)
215 			t->t_nextstate(t, c);
216 		else
217 			t->t_curscs = 0;
218 		break;
219 	case '\r':
220 		teken_subr_carriage_return(t);
221 		break;
222 	case '\t':
223 		teken_subr_horizontal_tab(t);
224 		break;
225 	default:
226 		t->t_nextstate(t, c);
227 		break;
228 	}
229 
230 	/* Post-processing assertions. */
231 	teken_assert(t->t_cursor.tp_row >= t->t_originreg.ts_begin);
232 	teken_assert(t->t_cursor.tp_row < t->t_originreg.ts_end);
233 	teken_assert(t->t_cursor.tp_row < t->t_winsize.tp_row);
234 	teken_assert(t->t_cursor.tp_col < t->t_winsize.tp_col);
235 	teken_assert(t->t_saved_cursor.tp_row < t->t_winsize.tp_row);
236 	teken_assert(t->t_saved_cursor.tp_col < t->t_winsize.tp_col);
237 	teken_assert(t->t_scrollreg.ts_end <= t->t_winsize.tp_row);
238 	teken_assert(t->t_scrollreg.ts_begin < t->t_scrollreg.ts_end);
239 	/* Origin region has to be window size or the same as scrollreg. */
240 	teken_assert((t->t_originreg.ts_begin == t->t_scrollreg.ts_begin &&
241 	    t->t_originreg.ts_end == t->t_scrollreg.ts_end) ||
242 	    (t->t_originreg.ts_begin == 0 &&
243 	    t->t_originreg.ts_end == t->t_winsize.tp_row));
244 }
245 
246 static void
247 teken_input_byte(teken_t *t, unsigned char c)
248 {
249 
250 	/*
251 	 * UTF-8 handling.
252 	 */
253 	if ((c & 0x80) == 0x00 || t->t_stateflags & TS_8BIT) {
254 		/* One-byte sequence. */
255 		t->t_utf8_left = 0;
256 		teken_input_char(t, c);
257 	} else if ((c & 0xe0) == 0xc0) {
258 		/* Two-byte sequence. */
259 		t->t_utf8_left = 1;
260 		t->t_utf8_partial = c & 0x1f;
261 	} else if ((c & 0xf0) == 0xe0) {
262 		/* Three-byte sequence. */
263 		t->t_utf8_left = 2;
264 		t->t_utf8_partial = c & 0x0f;
265 	} else if ((c & 0xf8) == 0xf0) {
266 		/* Four-byte sequence. */
267 		t->t_utf8_left = 3;
268 		t->t_utf8_partial = c & 0x07;
269 	} else if ((c & 0xc0) == 0x80) {
270 		if (t->t_utf8_left == 0)
271 			return;
272 		t->t_utf8_left--;
273 		t->t_utf8_partial = (t->t_utf8_partial << 6) | (c & 0x3f);
274 		if (t->t_utf8_left == 0) {
275 			teken_printf("Got UTF-8 char %x\n", t->t_utf8_partial);
276 			teken_input_char(t, t->t_utf8_partial);
277 		}
278 	}
279 }
280 
281 void
282 teken_input(teken_t *t, const void *buf, size_t len)
283 {
284 	const char *c = buf;
285 
286 	while (len-- > 0)
287 		teken_input_byte(t, *c++);
288 }
289 
290 const teken_pos_t *
291 teken_get_cursor(teken_t *t)
292 {
293 
294 	return (&t->t_cursor);
295 }
296 
297 void
298 teken_set_cursor(teken_t *t, const teken_pos_t *p)
299 {
300 
301 	/* XXX: bounds checking with originreg! */
302 	teken_assert(p->tp_row < t->t_winsize.tp_row);
303 	teken_assert(p->tp_col < t->t_winsize.tp_col);
304 
305 	t->t_cursor = *p;
306 }
307 
308 const teken_attr_t *
309 teken_get_curattr(teken_t *t)
310 {
311 
312 	return (&t->t_curattr);
313 }
314 
315 void
316 teken_set_curattr(teken_t *t, const teken_attr_t *a)
317 {
318 
319 	t->t_curattr = *a;
320 }
321 
322 const teken_attr_t *
323 teken_get_defattr(teken_t *t)
324 {
325 
326 	return (&t->t_defattr);
327 }
328 
329 void
330 teken_set_defattr(teken_t *t, const teken_attr_t *a)
331 {
332 
333 	t->t_curattr = t->t_saved_curattr = t->t_defattr = *a;
334 }
335 
336 const teken_pos_t *
337 teken_get_winsize(teken_t *t)
338 {
339 
340 	return (&t->t_winsize);
341 }
342 
343 static void
344 teken_trim_cursor_pos(teken_t *t, const teken_pos_t *new)
345 {
346 	const teken_pos_t *cur;
347 
348 	cur = &t->t_winsize;
349 
350 	if (cur->tp_row < new->tp_row || cur->tp_col < new->tp_col)
351 		return;
352 	if (t->t_cursor.tp_row >= new->tp_row)
353 		t->t_cursor.tp_row = new->tp_row - 1;
354 	if (t->t_cursor.tp_col >= new->tp_col)
355 		t->t_cursor.tp_col = new->tp_col - 1;
356 }
357 
358 void
359 teken_set_winsize(teken_t *t, const teken_pos_t *p)
360 {
361 
362 	teken_trim_cursor_pos(t, p);
363 	t->t_winsize = *p;
364 	teken_subr_do_reset(t);
365 }
366 
367 void
368 teken_set_winsize_noreset(teken_t *t, const teken_pos_t *p)
369 {
370 
371 	teken_trim_cursor_pos(t, p);
372 	t->t_winsize = *p;
373 	teken_subr_do_resize(t);
374 }
375 
376 void
377 teken_set_8bit(teken_t *t)
378 {
379 
380 	t->t_stateflags |= TS_8BIT;
381 }
382 
383 void
384 teken_set_cons25(teken_t *t)
385 {
386 
387 	t->t_stateflags |= TS_CONS25;
388 }
389 
390 /*
391  * State machine.
392  */
393 
394 static void
395 teken_state_switch(teken_t *t, teken_state_t *s)
396 {
397 
398 	t->t_nextstate = s;
399 	t->t_curnum = 0;
400 	t->t_stateflags |= TS_FIRSTDIGIT;
401 }
402 
403 static int
404 teken_state_numbers(teken_t *t, teken_char_t c)
405 {
406 
407 	teken_assert(t->t_curnum < T_NUMSIZE);
408 
409 	if (c >= '0' && c <= '9') {
410 		if (t->t_stateflags & TS_FIRSTDIGIT) {
411 			/* First digit. */
412 			t->t_stateflags &= ~TS_FIRSTDIGIT;
413 			t->t_nums[t->t_curnum] = c - '0';
414 		} else if (t->t_nums[t->t_curnum] < UINT_MAX / 100) {
415 			/*
416 			 * There is no need to continue parsing input
417 			 * once the value exceeds the size of the
418 			 * terminal. It would only allow for integer
419 			 * overflows when performing arithmetic on the
420 			 * cursor position.
421 			 *
422 			 * Ignore any further digits if the value is
423 			 * already UINT_MAX / 100.
424 			 */
425 			t->t_nums[t->t_curnum] =
426 			    t->t_nums[t->t_curnum] * 10 + c - '0';
427 		}
428 		return (1);
429 	} else if (c == ';') {
430 		if (t->t_stateflags & TS_FIRSTDIGIT)
431 			t->t_nums[t->t_curnum] = 0;
432 
433 		/* Only allow a limited set of arguments. */
434 		if (++t->t_curnum == T_NUMSIZE) {
435 			teken_state_switch(t, teken_state_init);
436 			return (1);
437 		}
438 
439 		t->t_stateflags |= TS_FIRSTDIGIT;
440 		return (1);
441 	} else {
442 		if (t->t_stateflags & TS_FIRSTDIGIT && t->t_curnum > 0) {
443 			/* Finish off the last empty argument. */
444 			t->t_nums[t->t_curnum] = 0;
445 			t->t_curnum++;
446 		} else if ((t->t_stateflags & TS_FIRSTDIGIT) == 0) {
447 			/* Also count the last argument. */
448 			t->t_curnum++;
449 		}
450 	}
451 
452 	return (0);
453 }
454 
455 teken_color_t
456 teken_256to8(teken_color_t c)
457 {
458 	unsigned int r, g, b;
459 
460 	if (c < 16) {
461 		/* Traditional color indices. */
462 		return (c % 8);
463 	} else if (c >= 244) {
464 		/* Upper grayscale colors. */
465 		return (TC_WHITE);
466 	} else if (c >= 232) {
467 		/* Lower grayscale colors. */
468 		return (TC_BLACK);
469 	}
470 
471 	/* Convert to RGB. */
472 	c -= 16;
473 	b = c % 6;
474 	g = (c / 6) % 6;
475 	r = c / 36;
476 
477 	if (r < g) {
478 		/* Possibly green. */
479 		if (g < b)
480 			return (TC_BLUE);
481 		else if (g > b)
482 			return (TC_GREEN);
483 		else
484 			return (TC_CYAN);
485 	} else if (r > g) {
486 		/* Possibly red. */
487 		if (r < b)
488 			return (TC_BLUE);
489 		else if (r > b)
490 			return (TC_RED);
491 		else
492 			return (TC_MAGENTA);
493 	} else {
494 		/* Possibly brown. */
495 		if (g < b)
496 			return (TC_BLUE);
497 		else if (g > b)
498 			return (TC_BROWN);
499 		else if (r < 3)
500 			return (TC_BLACK);
501 		else
502 			return (TC_WHITE);
503 	}
504 }
505 
506 static const char * const special_strings_cons25[] = {
507 	[TKEY_UP] = "\x1B[A",		[TKEY_DOWN] = "\x1B[B",
508 	[TKEY_LEFT] = "\x1B[D",		[TKEY_RIGHT] = "\x1B[C",
509 
510 	[TKEY_HOME] = "\x1B[H",		[TKEY_END] = "\x1B[F",
511 	[TKEY_INSERT] = "\x1B[L",	[TKEY_DELETE] = "\x7F",
512 	[TKEY_PAGE_UP] = "\x1B[I",	[TKEY_PAGE_DOWN] = "\x1B[G",
513 
514 	[TKEY_F1] = "\x1B[M",		[TKEY_F2] = "\x1B[N",
515 	[TKEY_F3] = "\x1B[O",		[TKEY_F4] = "\x1B[P",
516 	[TKEY_F5] = "\x1B[Q",		[TKEY_F6] = "\x1B[R",
517 	[TKEY_F7] = "\x1B[S",		[TKEY_F8] = "\x1B[T",
518 	[TKEY_F9] = "\x1B[U",		[TKEY_F10] = "\x1B[V",
519 	[TKEY_F11] = "\x1B[W",		[TKEY_F12] = "\x1B[X",
520 };
521 
522 static const char * const special_strings_ckeys[] = {
523 	[TKEY_UP] = "\x1BOA",		[TKEY_DOWN] = "\x1BOB",
524 	[TKEY_LEFT] = "\x1BOD",		[TKEY_RIGHT] = "\x1BOC",
525 
526 	[TKEY_HOME] = "\x1BOH",		[TKEY_END] = "\x1BOF",
527 };
528 
529 static const char * const special_strings_normal[] = {
530 	[TKEY_UP] = "\x1B[A",		[TKEY_DOWN] = "\x1B[B",
531 	[TKEY_LEFT] = "\x1B[D",		[TKEY_RIGHT] = "\x1B[C",
532 
533 	[TKEY_HOME] = "\x1B[H",		[TKEY_END] = "\x1B[F",
534 	[TKEY_INSERT] = "\x1B[2~",	[TKEY_DELETE] = "\x1B[3~",
535 	[TKEY_PAGE_UP] = "\x1B[5~",	[TKEY_PAGE_DOWN] = "\x1B[6~",
536 
537 	[TKEY_F1] = "\x1BOP",		[TKEY_F2] = "\x1BOQ",
538 	[TKEY_F3] = "\x1BOR",		[TKEY_F4] = "\x1BOS",
539 	[TKEY_F5] = "\x1B[15~",		[TKEY_F6] = "\x1B[17~",
540 	[TKEY_F7] = "\x1B[18~",		[TKEY_F8] = "\x1B[19~",
541 	[TKEY_F9] = "\x1B[20~",		[TKEY_F10] = "\x1B[21~",
542 	[TKEY_F11] = "\x1B[23~",	[TKEY_F12] = "\x1B[24~",
543 };
544 
545 const char *
546 teken_get_sequence(teken_t *t, unsigned int k)
547 {
548 
549 	/* Cons25 mode. */
550 	if (t->t_stateflags & TS_CONS25 &&
551 	    k < sizeof special_strings_cons25 / sizeof(char *))
552 		return (special_strings_cons25[k]);
553 
554 	/* Cursor keys mode. */
555 	if (t->t_stateflags & TS_CURSORKEYS &&
556 	    k < sizeof special_strings_ckeys / sizeof(char *))
557 		return (special_strings_ckeys[k]);
558 
559 	/* Default xterm sequences. */
560 	if (k < sizeof special_strings_normal / sizeof(char *))
561 		return (special_strings_normal[k]);
562 
563 	return (NULL);
564 }
565 
566 #include "teken_state.h"
567