xref: /freebsd/sys/teken/teken.c (revision aa77200569e397d6ff1fdb4d255d0fa254d0a128) 
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/lock.h>
33 #include <sys/systm.h>
34 #define	teken_assert(x)		MPASS(x)
35 #else /* !(__FreeBSD__ && _KERNEL) */
36 #include <sys/types.h>
37 #include <assert.h>
38 #include <stdint.h>
39 #include <stdio.h>
40 #include <string.h>
41 #define	teken_assert(x)		assert(x)
42 #endif /* __FreeBSD__ && _KERNEL */
43 
44 /* debug messages */
45 #define	teken_printf(x,...)
46 
47 /* Private flags for t_stateflags. */
48 #define	TS_FIRSTDIGIT	0x0001	/* First numeric digit in escape sequence. */
49 #define	TS_INSERT	0x0002	/* Insert mode. */
50 #define	TS_AUTOWRAP	0x0004	/* Autowrap. */
51 #define	TS_ORIGIN	0x0008	/* Origin mode. */
52 #define	TS_WRAPPED	0x0010	/* Next character should be printed on col 0. */
53 #define	TS_8BIT		0x0020	/* UTF-8 disabled. */
54 #define	TS_CONS25	0x0040	/* cons25 emulation. */
55 #define	TS_INSTRING	0x0080	/* Inside string. */
56 #define	TS_CURSORKEYS	0x0100	/* Cursor keys mode. */
57 
58 /* Character that blanks a cell. */
59 #define	BLANK	' '
60 
61 #include "teken.h"
62 #include "teken_wcwidth.h"
63 #include "teken_scs.h"
64 
65 static teken_state_t	teken_state_init;
66 
67 /*
68  * Wrappers for hooks.
69  */
70 
71 static inline void
72 teken_funcs_bell(teken_t *t)
73 {
74 
75 	t->t_funcs->tf_bell(t->t_softc);
76 }
77 
78 static inline void
79 teken_funcs_cursor(teken_t *t)
80 {
81 
82 	teken_assert(t->t_cursor.tp_row < t->t_winsize.tp_row);
83 	teken_assert(t->t_cursor.tp_col < t->t_winsize.tp_col);
84 
85 	t->t_funcs->tf_cursor(t->t_softc, &t->t_cursor);
86 }
87 
88 static inline void
89 teken_funcs_putchar(teken_t *t, const teken_pos_t *p, teken_char_t c,
90     const teken_attr_t *a)
91 {
92 
93 	teken_assert(p->tp_row < t->t_winsize.tp_row);
94 	teken_assert(p->tp_col < t->t_winsize.tp_col);
95 
96 	t->t_funcs->tf_putchar(t->t_softc, p, c, a);
97 }
98 
99 static inline void
100 teken_funcs_fill(teken_t *t, const teken_rect_t *r,
101     const teken_char_t c, const teken_attr_t *a)
102 {
103 
104 	teken_assert(r->tr_end.tp_row > r->tr_begin.tp_row);
105 	teken_assert(r->tr_end.tp_row <= t->t_winsize.tp_row);
106 	teken_assert(r->tr_end.tp_col > r->tr_begin.tp_col);
107 	teken_assert(r->tr_end.tp_col <= t->t_winsize.tp_col);
108 
109 	t->t_funcs->tf_fill(t->t_softc, r, c, a);
110 }
111 
112 static inline void
113 teken_funcs_copy(teken_t *t, const teken_rect_t *r, const teken_pos_t *p)
114 {
115 
116 	teken_assert(r->tr_end.tp_row > r->tr_begin.tp_row);
117 	teken_assert(r->tr_end.tp_row <= t->t_winsize.tp_row);
118 	teken_assert(r->tr_end.tp_col > r->tr_begin.tp_col);
119 	teken_assert(r->tr_end.tp_col <= t->t_winsize.tp_col);
120 	teken_assert(p->tp_row + (r->tr_end.tp_row - r->tr_begin.tp_row) <= t->t_winsize.tp_row);
121 	teken_assert(p->tp_col + (r->tr_end.tp_col - r->tr_begin.tp_col) <= t->t_winsize.tp_col);
122 
123 	t->t_funcs->tf_copy(t->t_softc, r, p);
124 }
125 
126 static inline void
127 teken_funcs_param(teken_t *t, int cmd, unsigned int value)
128 {
129 
130 	t->t_funcs->tf_param(t->t_softc, cmd, value);
131 }
132 
133 static inline void
134 teken_funcs_respond(teken_t *t, const void *buf, size_t len)
135 {
136 
137 	t->t_funcs->tf_respond(t->t_softc, buf, len);
138 }
139 
140 #include "teken_subr.h"
141 #include "teken_subr_compat.h"
142 
143 /*
144  * Programming interface.
145  */
146 
147 void
148 teken_init(teken_t *t, const teken_funcs_t *tf, void *softc)
149 {
150 	teken_pos_t tp = { .tp_row = 24, .tp_col = 80 };
151 
152 	t->t_funcs = tf;
153 	t->t_softc = softc;
154 
155 	t->t_nextstate = teken_state_init;
156 	t->t_stateflags = 0;
157 	t->t_utf8_left = 0;
158 
159 	t->t_defattr.ta_format = 0;
160 	t->t_defattr.ta_fgcolor = TC_WHITE;
161 	t->t_defattr.ta_bgcolor = TC_BLACK;
162 	teken_subr_do_reset(t);
163 
164 	teken_set_winsize(t, &tp);
165 }
166 
167 static void
168 teken_input_char(teken_t *t, teken_char_t c)
169 {
170 
171 	/*
172 	 * There is no support for DCS and OSC.  Just discard strings
173 	 * until we receive characters that may indicate string
174 	 * termination.
175 	 */
176 	if (t->t_stateflags & TS_INSTRING) {
177 		switch (c) {
178 		case '\x1B':
179 			t->t_stateflags &= ~TS_INSTRING;
180 			break;
181 		case '\a':
182 			t->t_stateflags &= ~TS_INSTRING;
183 			return;
184 		default:
185 			return;
186 		}
187 	}
188 
189 	switch (c) {
190 	case '\0':
191 		break;
192 	case '\a':
193 		teken_subr_bell(t);
194 		break;
195 	case '\b':
196 		teken_subr_backspace(t);
197 		break;
198 	case '\n':
199 	case '\x0B':
200 		teken_subr_newline(t);
201 		break;
202 	case '\x0C':
203 		teken_subr_newpage(t);
204 		break;
205 	case '\x0E':
206 		if (t->t_stateflags & TS_CONS25)
207 			t->t_nextstate(t, c);
208 		else
209 			t->t_curscs = 1;
210 		break;
211 	case '\x0F':
212 		if (t->t_stateflags & TS_CONS25)
213 			t->t_nextstate(t, c);
214 		else
215 			t->t_curscs = 0;
216 		break;
217 	case '\r':
218 		teken_subr_carriage_return(t);
219 		break;
220 	case '\t':
221 		teken_subr_horizontal_tab(t);
222 		break;
223 	default:
224 		t->t_nextstate(t, c);
225 		break;
226 	}
227 
228 	/* Post-processing assertions. */
229 	teken_assert(t->t_cursor.tp_row >= t->t_originreg.ts_begin);
230 	teken_assert(t->t_cursor.tp_row < t->t_originreg.ts_end);
231 	teken_assert(t->t_cursor.tp_row < t->t_winsize.tp_row);
232 	teken_assert(t->t_cursor.tp_col < t->t_winsize.tp_col);
233 	teken_assert(t->t_saved_cursor.tp_row < t->t_winsize.tp_row);
234 	teken_assert(t->t_saved_cursor.tp_col < t->t_winsize.tp_col);
235 	teken_assert(t->t_scrollreg.ts_end <= t->t_winsize.tp_row);
236 	teken_assert(t->t_scrollreg.ts_begin < t->t_scrollreg.ts_end);
237 	/* Origin region has to be window size or the same as scrollreg. */
238 	teken_assert((t->t_originreg.ts_begin == t->t_scrollreg.ts_begin &&
239 	    t->t_originreg.ts_end == t->t_scrollreg.ts_end) ||
240 	    (t->t_originreg.ts_begin == 0 &&
241 	    t->t_originreg.ts_end == t->t_winsize.tp_row));
242 }
243 
244 static void
245 teken_input_byte(teken_t *t, unsigned char c)
246 {
247 
248 	/*
249 	 * UTF-8 handling.
250 	 */
251 	if ((c & 0x80) == 0x00 || t->t_stateflags & TS_8BIT) {
252 		/* One-byte sequence. */
253 		t->t_utf8_left = 0;
254 		teken_input_char(t, c);
255 	} else if ((c & 0xe0) == 0xc0) {
256 		/* Two-byte sequence. */
257 		t->t_utf8_left = 1;
258 		t->t_utf8_partial = c & 0x1f;
259 	} else if ((c & 0xf0) == 0xe0) {
260 		/* Three-byte sequence. */
261 		t->t_utf8_left = 2;
262 		t->t_utf8_partial = c & 0x0f;
263 	} else if ((c & 0xf8) == 0xf0) {
264 		/* Four-byte sequence. */
265 		t->t_utf8_left = 3;
266 		t->t_utf8_partial = c & 0x07;
267 	} else if ((c & 0xc0) == 0x80) {
268 		if (t->t_utf8_left == 0)
269 			return;
270 		t->t_utf8_left--;
271 		t->t_utf8_partial = (t->t_utf8_partial << 6) | (c & 0x3f);
272 		if (t->t_utf8_left == 0) {
273 			teken_printf("Got UTF-8 char %x\n", t->t_utf8_partial);
274 			teken_input_char(t, t->t_utf8_partial);
275 		}
276 	}
277 }
278 
279 void
280 teken_input(teken_t *t, const void *buf, size_t len)
281 {
282 	const char *c = buf;
283 
284 	while (len-- > 0)
285 		teken_input_byte(t, *c++);
286 }
287 
288 const teken_pos_t *
289 teken_get_cursor(teken_t *t)
290 {
291 
292 	return (&t->t_cursor);
293 }
294 
295 void
296 teken_set_cursor(teken_t *t, const teken_pos_t *p)
297 {
298 
299 	/* XXX: bounds checking with originreg! */
300 	teken_assert(p->tp_row < t->t_winsize.tp_row);
301 	teken_assert(p->tp_col < t->t_winsize.tp_col);
302 
303 	t->t_cursor = *p;
304 }
305 
306 const teken_attr_t *
307 teken_get_curattr(teken_t *t)
308 {
309 
310 	return (&t->t_curattr);
311 }
312 
313 void
314 teken_set_curattr(teken_t *t, const teken_attr_t *a)
315 {
316 
317 	t->t_curattr = *a;
318 }
319 
320 const teken_attr_t *
321 teken_get_defattr(teken_t *t)
322 {
323 
324 	return (&t->t_defattr);
325 }
326 
327 void
328 teken_set_defattr(teken_t *t, const teken_attr_t *a)
329 {
330 
331 	t->t_curattr = t->t_saved_curattr = t->t_defattr = *a;
332 }
333 
334 const teken_pos_t *
335 teken_get_winsize(teken_t *t)
336 {
337 
338 	return (&t->t_winsize);
339 }
340 
341 void
342 teken_set_winsize(teken_t *t, const teken_pos_t *p)
343 {
344 
345 	t->t_winsize = *p;
346 	teken_subr_do_reset(t);
347 }
348 
349 void
350 teken_set_8bit(teken_t *t)
351 {
352 
353 	t->t_stateflags |= TS_8BIT;
354 }
355 
356 void
357 teken_set_cons25(teken_t *t)
358 {
359 
360 	t->t_stateflags |= TS_CONS25;
361 }
362 
363 /*
364  * State machine.
365  */
366 
367 static void
368 teken_state_switch(teken_t *t, teken_state_t *s)
369 {
370 
371 	t->t_nextstate = s;
372 	t->t_curnum = 0;
373 	t->t_stateflags |= TS_FIRSTDIGIT;
374 }
375 
376 static int
377 teken_state_numbers(teken_t *t, teken_char_t c)
378 {
379 
380 	teken_assert(t->t_curnum < T_NUMSIZE);
381 
382 	if (c >= '0' && c <= '9') {
383 		/*
384 		 * Don't do math with the default value of 1 when a
385 		 * custom number is inserted.
386 		 */
387 		if (t->t_stateflags & TS_FIRSTDIGIT) {
388 			t->t_stateflags &= ~TS_FIRSTDIGIT;
389 			t->t_nums[t->t_curnum] = 0;
390 		} else {
391 			t->t_nums[t->t_curnum] *= 10;
392 		}
393 
394 		t->t_nums[t->t_curnum] += c - '0';
395 		return (1);
396 	} else if (c == ';') {
397 		if (t->t_stateflags & TS_FIRSTDIGIT)
398 			t->t_nums[t->t_curnum] = 0;
399 
400 		/* Only allow a limited set of arguments. */
401 		if (++t->t_curnum == T_NUMSIZE) {
402 			teken_state_switch(t, teken_state_init);
403 			return (1);
404 		}
405 
406 		t->t_stateflags |= TS_FIRSTDIGIT;
407 		return (1);
408 	} else {
409 		if (t->t_stateflags & TS_FIRSTDIGIT && t->t_curnum > 0) {
410 			/* Finish off the last empty argument. */
411 			t->t_nums[t->t_curnum] = 0;
412 			t->t_curnum++;
413 		} else if ((t->t_stateflags & TS_FIRSTDIGIT) == 0) {
414 			/* Also count the last argument. */
415 			t->t_curnum++;
416 		}
417 	}
418 
419 	return (0);
420 }
421 
422 teken_color_t
423 teken_256to8(teken_color_t c)
424 {
425 	unsigned int r, g, b;
426 
427 	if (c < 16) {
428 		/* Traditional color indices. */
429 		return (c % 8);
430 	} else if (c >= 244) {
431 		/* Upper grayscale colors. */
432 		return (TC_WHITE);
433 	} else if (c >= 232) {
434 		/* Lower grayscale colors. */
435 		return (TC_BLACK);
436 	}
437 
438 	/* Convert to RGB. */
439 	c -= 16;
440 	b = c % 6;
441 	g = (c / 6) % 6;
442 	r = c / 36;
443 
444 	if (r < g) {
445 		/* Possibly green. */
446 		if (g < b)
447 			return (TC_BLUE);
448 		else if (g > b)
449 			return (TC_GREEN);
450 		else
451 			return (TC_CYAN);
452 	} else if (r > g) {
453 		/* Possibly red. */
454 		if (r < b)
455 			return (TC_BLUE);
456 		else if (r > b)
457 			return (TC_RED);
458 		else
459 			return (TC_MAGENTA);
460 	} else {
461 		/* Possibly brown. */
462 		if (g < b)
463 			return (TC_BLUE);
464 		else if (g > b)
465 			return (TC_BROWN);
466 		else if (r < 3)
467 			return (TC_BLACK);
468 		else
469 			return (TC_WHITE);
470 	}
471 }
472 
473 static const char * const special_strings_cons25[] = {
474 	[TKEY_UP] = "\x1B[A",		[TKEY_DOWN] = "\x1B[B",
475 	[TKEY_LEFT] = "\x1B[D",		[TKEY_RIGHT] = "\x1B[C",
476 
477 	[TKEY_HOME] = "\x1B[H",		[TKEY_END] = "\x1B[F",
478 	[TKEY_INSERT] = "\x1B[L",	[TKEY_DELETE] = "\x7F",
479 	[TKEY_PAGE_UP] = "\x1B[I",	[TKEY_PAGE_DOWN] = "\x1B[G",
480 
481 	[TKEY_F1] = "\x1B[M",		[TKEY_F2] = "\x1B[N",
482 	[TKEY_F3] = "\x1B[O",		[TKEY_F4] = "\x1B[P",
483 	[TKEY_F5] = "\x1B[Q",		[TKEY_F6] = "\x1B[R",
484 	[TKEY_F7] = "\x1B[S",		[TKEY_F8] = "\x1B[T",
485 	[TKEY_F9] = "\x1B[U",		[TKEY_F10] = "\x1B[V",
486 	[TKEY_F11] = "\x1B[W",		[TKEY_F12] = "\x1B[X",
487 };
488 
489 static const char * const special_strings_ckeys[] = {
490 	[TKEY_UP] = "\x1BOA",		[TKEY_DOWN] = "\x1BOB",
491 	[TKEY_LEFT] = "\x1BOD",		[TKEY_RIGHT] = "\x1BOC",
492 
493 	[TKEY_HOME] = "\x1BOH",		[TKEY_END] = "\x1BOF",
494 };
495 
496 static const char * const special_strings_normal[] = {
497 	[TKEY_UP] = "\x1B[A",		[TKEY_DOWN] = "\x1B[B",
498 	[TKEY_LEFT] = "\x1B[D",		[TKEY_RIGHT] = "\x1B[C",
499 
500 	[TKEY_HOME] = "\x1B[H",		[TKEY_END] = "\x1B[F",
501 	[TKEY_INSERT] = "\x1B[2~",	[TKEY_DELETE] = "\x1B[3~",
502 	[TKEY_PAGE_UP] = "\x1B[5~",	[TKEY_PAGE_DOWN] = "\x1B[6~",
503 
504 	[TKEY_F1] = "\x1BOP",		[TKEY_F2] = "\x1BOQ",
505 	[TKEY_F3] = "\x1BOR",		[TKEY_F4] = "\x1BOS",
506 	[TKEY_F5] = "\x1B[15~",		[TKEY_F6] = "\x1B[17~",
507 	[TKEY_F7] = "\x1B[18~",		[TKEY_F8] = "\x1B[19~",
508 	[TKEY_F9] = "\x1B[20~",		[TKEY_F10] = "\x1B[21~",
509 	[TKEY_F11] = "\x1B[23~",	[TKEY_F12] = "\x1B[24~",
510 };
511 
512 const char *
513 teken_get_sequence(teken_t *t, unsigned int k)
514 {
515 
516 	/* Cons25 mode. */
517 	if (t->t_stateflags & TS_CONS25 &&
518 	    k < sizeof special_strings_cons25 / sizeof(char *))
519 		return (special_strings_cons25[k]);
520 
521 	/* Cursor keys mode. */
522 	if (t->t_stateflags & TS_CURSORKEYS &&
523 	    k < sizeof special_strings_ckeys / sizeof(char *))
524 		return (special_strings_ckeys[k]);
525 
526 	/* Default xterm sequences. */
527 	if (k < sizeof special_strings_normal / sizeof(char *))
528 		return (special_strings_normal[k]);
529 
530 	return (NULL);
531 }
532 
533 #include "teken_state.h"
534