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fbpad: cast the return value to unsigned char in readchar()
[fbpad.git] / term.c
blobdcef4b38f4469969d3e459ce7e44650b4d32603c
1 #include <ctype.h>
2 #include <errno.h>
3 #include <fcntl.h>
4 #include <poll.h>
5 #include <stdlib.h>
6 #include <stdio.h>
7 #include <string.h>
8 #include <sys/types.h>
9 #include <sys/ioctl.h>
10 #include <termios.h>
11 #include <unistd.h>
12 #include "config.h"
13 #include "fbpad.h"
14
15 #define MODE_CURSOR 0x01
16 #define MODE_WRAP 0x02
17 #define MODE_ORIGIN 0x04
18 #define MODE_AUTOCR 0x08
19 #define MODE_DEFAULT (MODE_CURSOR | MODE_WRAP)
20 #define ATTR_BOLD 0x10
21 #define ATTR_ITALIC 0x20
22 #define ATTR_REV 0x40
23 #define ATTR_ALL (ATTR_BOLD | ATTR_ITALIC | ATTR_REV)
24 #define MODE_INSERT 0x100
25 #define MODE_WRAPREADY 0x200
26
27 #define LIMIT(n, a, b) ((n) < (a) ? (a) : ((n) > (b) ? (b) : (n)))
28 #define BIT_SET(i, b, val) ((val) ? ((i) | (b)) : ((i) & ~(b)))
29 #define OFFSET(r, c) ((r) * pad_cols() + (c))
30
31 static struct term *term;
32 static int *screen;
33 static short *fgs, *bgs;
34 static int *dirty;
35 static int lazy;
36 static int row, col;
37 static int fg, bg;
38 static int top, bot;
39 static int mode;
40 static int visible;
41
42 /* low level drawing and lazy updating */
43
44 static int fgcolor(void)
45 {
46 int c = mode & ATTR_REV ? bg : fg;
47 if (mode & ATTR_BOLD)
48 c |= FN_B;
49 if (mode & ATTR_ITALIC)
50 c |= FN_I;
51 return c;
52 }
53
54 static int bgcolor(void)
55 {
56 return mode & ATTR_REV ? fg : bg;
57 }
58
59 /* assumes visible && !lazy */
60 static void _draw_pos(int r, int c, int cursor)
61 {
62 int rev = cursor && mode & MODE_CURSOR;
63 int i = OFFSET(r, c);
64 int fg = rev ? bgs[i] : fgs[i];
65 int bg = rev ? fgs[i] : bgs[i];
66 pad_put(screen[i], r, c, fg, bg);
67 }
68
69 /* assumes visible && !lazy */
70 static void _draw_row(int r)
71 {
72 int cbg, cch; /* current background and character */
73 int fbg, fsc = -1; /* filling background and start column */
74 int i;
75 /* call pad_fill() only once for blank columns with identical backgrounds */
76 for (i = 0; i < pad_cols(); i++) {
77 cbg = bgs[OFFSET(r, i)];
78 cch = screen[OFFSET(r, i)] ? screen[OFFSET(r, i)] : ' ';
79 if (fsc >= 0 && (cbg != fbg || (cch != ' '))) {
80 pad_fill(r, r + 1, fsc, i, fbg & FN_C);
81 fsc = -1;
82 }
83 if (cch != ' ') {
84 _draw_pos(r, i, 0);
85 } else if (fsc < 0) {
86 fsc = i;
87 fbg = cbg;
88 }
89 }
90 pad_fill(r, r + 1, fsc >= 0 ? fsc : pad_cols(), -1, cbg & FN_C);
91 }
92
93 static int candraw(int sr, int er)
94 {
95 int i;
96 if (lazy)
97 for (i = sr; i < er; i++)
98 dirty[i] = 1;
99 return visible && !lazy;
100 }
101
102 static void draw_rows(int sr, int er)
103 {
104 int i;
105 if (candraw(sr, er))
106 for (i = sr; i < er; i++)
107 _draw_row(i);
108 }
109
110 static void draw_cols(int r, int sc, int ec)
111 {
112 int i;
113 if (candraw(r, r + 1))
114 for (i = sc; i < ec; i++)
115 _draw_pos(r, i, 0);
116 }
117
118 static void draw_char(int ch, int r, int c)
119 {
120 int i = OFFSET(r, c);
121 screen[i] = ch;
122 fgs[i] = fgcolor();
123 bgs[i] = bgcolor();
124 if (candraw(r, r + 1))
125 _draw_pos(r, c, 0);
126 }
127
128 static void draw_cursor(int put)
129 {
130 if (candraw(row, row + 1))
131 _draw_pos(row, col, put);
132 }
133
134 static void lazy_start(void)
135 {
136 memset(dirty, 0, pad_rows() * sizeof(*dirty));
137 lazy = 1;
138 }
139
140 static void lazy_flush(void)
141 {
142 int i;
143 if (!visible || !lazy)
144 return;
145 for (i = 0; i < pad_rows(); i++)
146 if (dirty[i])
147 _draw_row(i);
148 if (dirty[row])
149 _draw_pos(row, col, 1);
150 lazy = 0;
151 term->hpos = 0;
152 }
153
154 static void screen_reset(int i, int n)
155 {
156 int c;
157 candraw(i / pad_cols(), (i + n) / pad_cols() + 1);
158 memset(screen + i, 0, n * sizeof(*screen));
159 for (c = 0; c < n; c++)
160 fgs[i + c] = fg;
161 for (c = 0; c < n; c++)
162 bgs[i + c] = bg;
163 }
164
165 static void screen_move(int dst, int src, int n)
166 {
167 if (n > 0)
168 candraw(MIN(src, dst) / pad_cols(), (MAX(src, dst) + n) / pad_cols() + 1);
169 else
170 candraw((MIN(src, dst) + n) / pad_cols(), MAX(src, dst) / pad_cols() + 1);
171 memmove(screen + dst, screen + src, n * sizeof(*screen));
172 memmove(fgs + dst, fgs + src, n * sizeof(*fgs));
173 memmove(bgs + dst, bgs + src, n * sizeof(*bgs));
174 }
175
176 /* terminal input buffering */
177
178 #define PTYLEN (1 << 16)
179
180 static char ptybuf[PTYLEN]; /* always emptied in term_read() */
181 static int ptylen; /* buffer length */
182 static int ptycur; /* current offset */
183
184 static int waitpty(int us)
185 {
186 struct pollfd ufds[1];
187 ufds[0].fd = term->fd;
188 ufds[0].events = POLLIN;
189 return poll(ufds, 1, us) <= 0;
190 }
191
192 static int readpty(void)
193 {
194 int nr;
195 if (ptycur < ptylen)
196 return (unsigned char) ptybuf[ptycur++];
197 if (!term->fd)
198 return -1;
199 ptylen = 0;
200 while ((nr = read(term->fd, ptybuf + ptylen, PTYLEN - ptylen)) > 0)
201 ptylen += nr;
202 if (!ptylen && errno == EAGAIN && !waitpty(100))
203 ptylen = read(term->fd, ptybuf, PTYLEN);
204 ptycur = 1;
205 return ptylen > 0 ? (unsigned char) ptybuf[0] : -1;
206 }
207
208 /* term interface functions */
209
210 void term_send(int c)
211 {
212 char b = c;
213 if (term->fd)
214 write(term->fd, &b, 1);
215 }
216
217 static void term_sendstr(char *s)
218 {
219 if (term->fd)
220 write(term->fd, s, strlen(s));
221 }
222
223 static void term_blank(void)
224 {
225 screen_reset(0, pad_rows() * pad_cols());
226 if (visible)
227 pad_fill(0, -1, 0, -1, bgcolor() & FN_C);
228 }
229
230 static void ctlseq(void);
231 void term_read(void)
232 {
233 ctlseq();
234 while (ptycur < ptylen) {
235 if (visible && !lazy && ptylen - ptycur > 15)
236 lazy_start();
237 ctlseq();
238 }
239 lazy_flush();
240 }
241
242 static void term_reset(void)
243 {
244 row = col = 0;
245 top = 0;
246 bot = pad_rows();
247 mode = MODE_DEFAULT;
248 fg = FGCOLOR;
249 bg = BGCOLOR;
250 term_blank();
251 }
252
253 static int _openpty(int *master, int *slave)
254 {
255 int unlock = 0;
256 int ptyno = 0;
257 char name[20];
258 if ((*master = open("/dev/ptmx", O_RDWR)) == -1)
259 return -1;
260 if (ioctl(*master, TIOCSPTLCK, &unlock) == -1)
261 return -1;
262 if (ioctl(*master, TIOCGPTN, &ptyno) == -1)
263 return -1;
264 sprintf(name, "/dev/pts/%d", ptyno);
265 *slave = open(name, O_RDWR | O_NOCTTY);
266 return 0;
267 }
268
269 static void _login(int fd)
270 {
271 struct winsize winp;
272 winp.ws_col = pad_cols();
273 winp.ws_row = pad_rows();
274 winp.ws_xpixel = 0;
275 winp.ws_ypixel = 0;
276 setsid();
277 ioctl(fd, TIOCSCTTY, NULL);
278 ioctl(fd, TIOCSWINSZ, &winp);
279 dup2(fd, 0);
280 dup2(fd, 1);
281 dup2(fd, 2);
282 if (fd > 2)
283 close(fd);
284 }
285
286 #define MAXENV (1 << 8)
287
288 static void envcpy(char **d, char **s)
289 {
290 while (*s)
291 *d++ = *s++;
292 *d = NULL;
293 }
294
295 static void execvep(char *cmd, char **argv, char **envp)
296 {
297 char path[512];
298 char *p = getenv("PATH");
299 execve(cmd, argv, envp);
300 while (*p) {
301 char *s = path;
302 while (*p && *p != ':')
303 *s++ = *p++;
304 *s++ = '/';
305 strcpy(s, cmd);
306 execve(path, argv, envp);
307 while (*p == ':')
308 p++;
309 }
310 }
311
312 extern char **environ;
313 void term_exec(char **args)
314 {
315 int master, slave;
316 memset(term, 0, sizeof(*term));
317 if (_openpty(&master, &slave) == -1)
318 return;
319 if ((term->pid = fork()) == -1)
320 return;
321 if (!term->pid) {
322 char *envp[MAXENV] = {"TERM=linux"};
323 envcpy(envp + 1, environ);
324 _login(slave);
325 close(master);
326 execvep(args[0], args, envp);
327 exit(1);
328 }
329 close(slave);
330 term->fd = master;
331 fcntl(term->fd, F_SETFD, fcntl(term->fd, F_GETFD) | FD_CLOEXEC);
332 fcntl(term->fd, F_SETFL, fcntl(term->fd, F_GETFL) | O_NONBLOCK);
333 term_reset();
334 memset(term->hist, 0, sizeof(term->hist));
335 }
336
337 static void misc_save(struct term_state *state)
338 {
339 state->row = row;
340 state->col = col;
341 state->fg = fg;
342 state->bg = bg;
343 state->mode = mode;
344 }
345
346 static void misc_load(struct term_state *state)
347 {
348 row = state->row;
349 col = state->col;
350 fg = state->fg;
351 bg = state->bg;
352 mode = state->mode;
353 }
354
355 void term_save(struct term *term)
356 {
357 visible = 0;
358 if (!lazy)
359 lazy_start();
360 misc_save(&term->cur);
361 term->top = top;
362 term->bot = bot;
363 term->lazy = lazy;
364 }
365
366 /* redraw the screen; if all is zero, update changed lines only */
367 void term_redraw(int all)
368 {
369 if (term->fd) {
370 if (all) {
371 pad_fill(pad_rows(), -1, 0, -1, BGCOLOR);
372 lazy_start();
373 memset(dirty, 1, pad_rows() * sizeof(*dirty));
374 }
375 if (all || !term->hpos)
376 lazy_flush();
377 } else {
378 if (all)
379 pad_fill(0, -1, 0, -1, 0);
380 }
381 }
382
383 void term_load(struct term *t, int flags)
384 {
385 term = t;
386 misc_load(&term->cur);
387 screen = term->screen;
388 fgs = term->fgs;
389 bgs = term->bgs;
390 visible = flags;
391 top = term->top;
392 bot = term->bot;
393 lazy = term->lazy;
394 dirty = term->dirty;
395 }
396
397 void term_end(void)
398 {
399 if (term->fd)
400 close(term->fd);
401 memset(term, 0, sizeof(*term));
402 term_load(term, visible);
403 if (visible)
404 term_redraw(1);
405 }
406
407 static int writeutf8(char *dst, int c)
408 {
409 char *d = dst;
410 int l;
411 if (c > 0xffff) {
412 *d++ = 0xf0 | (c >> 18);
413 l = 3;
414 } else if (c > 0x7ff) {
415 *d++ = 0xe0 | (c >> 12);
416 l = 2;
417 } else if (c > 0x7f) {
418 *d++ = 0xc0 | (c >> 6);
419 l = 1;
420 } else {
421 *d++ = c > 0 ? c : ' ';
422 l = 0;
423 }
424 while (l--)
425 *d++ = 0x80 | ((c >> (l * 6)) & 0x3f);
426 return d - dst;
427 }
428
429 void term_screenshot(void)
430 {
431 char buf[1 << 11];
432 int fd = open(SCRSHOT, O_CREAT | O_TRUNC | O_WRONLY, 0600);
433 int i, j;
434 for (i = 0; i < pad_rows(); i++) {
435 char *s = buf;
436 for (j = 0; j < pad_cols(); j++)
437 if (~screen[OFFSET(i, j)] & DWCHAR)
438 s += writeutf8(s, screen[OFFSET(i, j)]);
439 *s++ = '\n';
440 write(fd, buf, s - buf);
441 }
442 close(fd);
443 }
444
445 /* high-level drawing functions */
446
447 static void empty_rows(int sr, int er)
448 {
449 screen_reset(OFFSET(sr, 0), (er - sr) * pad_cols());
450 }
451
452 static void blank_rows(int sr, int er)
453 {
454 empty_rows(sr, er);
455 draw_rows(sr, er);
456 draw_cursor(1);
457 }
458
459 #define HISTROW(pos) (term->hist + ((term->hrow + NHIST - (pos)) % NHIST) * pad_cols())
460
461 static void scrl_rows(int nr)
462 {
463 int i;
464 for (i = 0; i < nr; i++) {
465 memcpy(HISTROW(0), screen + i * pad_cols(),
466 pad_cols() * sizeof(screen[0]));
467 term->hrow = (term->hrow + 1) % NHIST;
468 }
469 }
470
471 void term_scrl(int scrl)
472 {
473 int i, j;
474 int hpos = LIMIT(term->hpos + scrl, 0, NHIST);
475 term->hpos = hpos;
476 if (!hpos) {
477 lazy_flush();
478 return;
479 }
480 lazy_start();
481 memset(dirty, 1, pad_rows() * sizeof(*dirty));
482 for (i = 0; i < pad_rows(); i++) {
483 int off = (i - hpos) * pad_cols();
484 int *_scr = i < hpos ? HISTROW(hpos - i) : term->screen + off;
485 short *_fgs = i < hpos ? NULL : term->fgs + off;
486 short *_bgs = i < hpos ? NULL : term->bgs + off;
487 for (j = 0; j < pad_cols(); j++)
488 pad_put(_scr[j], i, j, _fgs ? _fgs[j] : BGCOLOR,
489 _bgs ? _bgs[j] : FGCOLOR);
490 }
491 }
492
493 static void scroll_screen(int sr, int nr, int n)
494 {
495 draw_cursor(0);
496 if (sr + n == 0)
497 scrl_rows(sr);
498 screen_move(OFFSET(sr + n, 0), OFFSET(sr, 0), nr * pad_cols());
499 if (n > 0)
500 empty_rows(sr, sr + n);
501 else
502 empty_rows(sr + nr + n, sr + nr);
503 draw_rows(MIN(sr, sr + n), MAX(sr + nr, sr + nr + n));
504 draw_cursor(1);
505 }
506
507 static void insert_lines(int n)
508 {
509 int sr = MAX(top, row);
510 int nr = bot - row - n;
511 if (nr > 0)
512 scroll_screen(sr, nr, n);
513 }
514
515 static void delete_lines(int n)
516 {
517 int r = MAX(top, row);
518 int sr = r + n;
519 int nr = bot - r - n;
520 if (nr > 0)
521 scroll_screen(sr, nr, -n);
522 }
523
524 static int origin(void)
525 {
526 return mode & MODE_ORIGIN;
527 }
528
529 static void move_cursor(int r, int c)
530 {
531 int t, b;
532 draw_cursor(0);
533 t = origin() ? top : 0;
534 b = origin() ? bot : pad_rows();
535 row = LIMIT(r, t, b - 1);
536 col = LIMIT(c, 0, pad_cols() - 1);
537 draw_cursor(1);
538 mode = BIT_SET(mode, MODE_WRAPREADY, 0);
539 }
540
541 static void set_region(int t, int b)
542 {
543 top = LIMIT(t - 1, 0, pad_rows() - 1);
544 bot = LIMIT(b ? b : pad_rows(), top + 1, pad_rows());
545 if (origin())
546 move_cursor(top, 0);
547 }
548
549 static void setattr(int m)
550 {
551 switch (m) {
552 case 0:
553 fg = FGCOLOR;
554 bg = BGCOLOR;
555 mode &= ~ATTR_ALL;
556 break;
557 case 1:
558 mode |= ATTR_BOLD;
559 break;
560 case 3:
561 mode |= ATTR_ITALIC;
562 break;
563 case 7:
564 mode |= ATTR_REV;
565 break;
566 case 22:
567 mode &= ~ATTR_BOLD;
568 break;
569 case 23:
570 mode &= ~ATTR_ITALIC;
571 break;
572 case 27:
573 mode &= ~ATTR_REV;
574 break;
575 default:
576 if ((m / 10) == 3)
577 fg = m > 37 ? FGCOLOR : m - 30;
578 if ((m / 10) == 4)
579 bg = m > 47 ? BGCOLOR : m - 40;
580 if ((m / 10) == 9)
581 fg = 8 + m - 90;
582 if ((m / 10) == 10)
583 bg = 8 + m - 100;
584 }
585 }
586
587 static void kill_chars(int sc, int ec)
588 {
589 int i;
590 for (i = sc; i < ec; i++)
591 draw_char(0, row, i);
592 draw_cursor(1);
593 }
594
595 static void move_chars(int sc, int nc, int n)
596 {
597 draw_cursor(0);
598 screen_move(OFFSET(row, sc + n), OFFSET(row, sc), nc);
599 if (n > 0)
600 screen_reset(OFFSET(row, sc), n);
601 else
602 screen_reset(OFFSET(row, pad_cols() + n), -n);
603 draw_cols(row, MIN(sc, sc + n), pad_cols());
604 draw_cursor(1);
605 }
606
607 static void delete_chars(int n)
608 {
609 int sc = col + n;
610 int nc = pad_cols() - sc;
611 move_chars(sc, nc, -n);
612 }
613
614 static void insert_chars(int n)
615 {
616 int nc = pad_cols() - col - n;
617 move_chars(col, nc, n);
618 }
619
620 static void advance(int dr, int dc, int scrl)
621 {
622 int r = row + dr;
623 int c = col + dc;
624 if (dr && r >= bot && scrl) {
625 int n = bot - r - 1;
626 int nr = (bot - top) + n;
627 scroll_screen(top + -n, nr, n);
628 }
629 if (dr && r < top && scrl) {
630 int n = top - r;
631 int nr = (bot - top) - n;
632 scroll_screen(top, nr, n);
633 }
634 r = dr ? LIMIT(r, top, bot - 1) : r;
635 c = LIMIT(c, 0, pad_cols() - 1);
636 move_cursor(r, c);
637 }
638
639 static void insertchar(int c)
640 {
641 if (mode & MODE_WRAPREADY)
642 advance(1, -col, 1);
643 if (mode & MODE_INSERT)
644 insert_chars(1);
645 draw_char(c, row, col);
646 if (col == pad_cols() - 1)
647 mode = BIT_SET(mode, MODE_WRAPREADY, 1);
648 else
649 advance(0, 1, 1);
650 }
651
652
653 /* partial vt102 implementation */
654
655 static void escseq(void);
656 static void escseq_cs(void);
657 static void escseq_g0(void);
658 static void escseq_g1(void);
659 static void escseq_g2(void);
660 static void escseq_g3(void);
661 static void csiseq(void);
662 static void csiseq_da(int c);
663 static void csiseq_dsr(int c);
664 static void modeseq(int c, int set);
665
666 /* comments taken from: http://www.ivarch.com/programs/termvt102.shtml */
667
668 static int readutf8(int c)
669 {
670 int result;
671 int l = 1;
672 if (~c & 0xc0)
673 return c;
674 while (l < 6 && c & (0x40 >> l))
675 l++;
676 result = (0x3f >> l) & c;
677 while (l--)
678 result = (result << 6) | (readpty() & 0x3f);
679 return result;
680 }
681
682 #define unknown(ctl, c)
683
684 /* control sequences */
685 static void ctlseq(void)
686 {
687 int c = readpty();
688 switch (c) {
689 case 0x09: /* HT horizontal tab to next tab stop */
690 advance(0, 8 - col % 8, 0);
691 break;
692 case 0x0a: /* LF line feed */
693 case 0x0b: /* VT line feed */
694 case 0x0c: /* FF line feed */
695 advance(1, (mode & MODE_AUTOCR) ? -col : 0, 1);
696 break;
697 case 0x08: /* BS backspace one column */
698 advance(0, -1, 0);
699 break;
700 case 0x1b: /* ESC start escape sequence */
701 escseq();
702 break;
703 case 0x0d: /* CR carriage return */
704 advance(0, -col, 0);
705 break;
706 case 0x00: /* NUL ignored */
707 case 0x07: /* BEL beep */
708 case 0x7f: /* DEL ignored */
709 break;
710 case 0x05: /* ENQ trigger answerback message */
711 case 0x0e: /* SO activate G1 character set & newline */
712 case 0x0f: /* SI activate G0 character set */
713 case 0x11: /* XON resume transmission */
714 case 0x13: /* XOFF stop transmission, ignore characters */
715 case 0x18: /* CAN interrupt escape sequence */
716 case 0x1a: /* SUB interrupt escape sequence */
717 case 0x9b: /* CSI equivalent to ESC [ */
718 unknown("ctlseq", c);
719 break;
720 default:
721 c = readutf8(c);
722 if (isdw(c) && col + 1 == pad_cols() && ~mode & MODE_WRAPREADY)
723 insertchar(0);
724 if (!iszw(c))
725 insertchar(c);
726 if (isdw(c))
727 insertchar(c | DWCHAR);
728 break;
729 }
730 }
731
732 #define ESCM(c) (((c) & 0xf0) == 0x20)
733 #define ESCF(c) ((c) > 0x30 && (c) < 0x7f)
734
735 /* escape sequences */
736 static void escseq(void)
737 {
738 int c = readpty();
739 while (ESCM(c))
740 c = readpty();
741 switch (c) {
742 case '[': /* CSI control sequence introducer */
743 csiseq();
744 break;
745 case '%': /* CS... escseq_cs table */
746 escseq_cs();
747 break;
748 case '(': /* G0... escseq_g0 table */
749 escseq_g0();
750 break;
751 case ')': /* G1... escseq_g1 table */
752 escseq_g1();
753 break;
754 case '*': /* G2... escseq_g2 table */
755 escseq_g2();
756 break;
757 case '+': /* G3... escseq_g3 table */
758 escseq_g3();
759 break;
760 case '7': /* DECSC save state (position, charset, attributes) */
761 misc_save(&term->sav);
762 break;
763 case '8': /* DECRC restore most recently saved state */
764 misc_load(&term->sav);
765 break;
766 case 'M': /* RI reverse line feed */
767 advance(-1, 0, 1);
768 break;
769 case 'D': /* IND line feed */
770 advance(1, 0, 1);
771 break;
772 case 'E': /* NEL newline */
773 advance(1, -col, 1);
774 break;
775 case 'c': /* RIS reset */
776 term_reset();
777 break;
778 case 'H': /* HTS set tab stop at current column */
779 case 'Z': /* DECID DEC private ID; return ESC [ ? 6 c (VT102) */
780 case '#': /* DECALN ("#8") DEC alignment test - fill screen with E's */
781 case '>': /* DECPNM set numeric keypad mode */
782 case '=': /* DECPAM set application keypad mode */
783 case 'N': /* SS2 select G2 charset for next char only */
784 case 'O': /* SS3 select G3 charset for next char only */
785 case 'P': /* DCS device control string (ended by ST) */
786 case 'X': /* SOS start of string */
787 case '^': /* PM privacy message (ended by ST) */
788 case '_': /* APC application program command (ended by ST) */
789 case '\\': /* ST string terminator */
790 case 'n': /* LS2 invoke G2 charset */
791 case 'o': /* LS3 invoke G3 charset */
792 case '|': /* LS3R invoke G3 charset as GR */
793 case '}': /* LS2R invoke G2 charset as GR */
794 case '~': /* LS1R invoke G1 charset as GR */
795 case ']': /* OSC operating system command */
796 case 'g': /* BEL alternate BEL */
797 default:
798 unknown("escseq", c);
799 break;
800 }
801 }
802
803 static void escseq_cs(void)
804 {
805 int c = readpty();
806 switch (c) {
807 case '@': /* CSDFL select default charset (ISO646/8859-1) */
808 case 'G': /* CSUTF8 select UTF-8 */
809 case '8': /* CSUTF8 select UTF-8 (obsolete) */
810 default:
811 unknown("escseq_cs", c);
812 break;
813 }
814 }
815
816 static void escseq_g0(void)
817 {
818 int c = readpty();
819 switch (c) {
820 case '8': /* G0DFL G0 charset = default mapping (ISO8859-1) */
821 case '0': /* G0GFX G0 charset = VT100 graphics mapping */
822 case 'U': /* G0ROM G0 charset = null mapping (straight to ROM) */
823 case 'K': /* G0USR G0 charset = user defined mapping */
824 case 'B': /* G0TXT G0 charset = ASCII mapping */
825 default:
826 unknown("escseq_g0", c);
827 break;
828 }
829 }
830
831 static void escseq_g1(void)
832 {
833 int c = readpty();
834 switch (c) {
835 case '8': /* G1DFL G1 charset = default mapping (ISO8859-1) */
836 case '0': /* G1GFX G1 charset = VT100 graphics mapping */
837 case 'U': /* G1ROM G1 charset = null mapping (straight to ROM) */
838 case 'K': /* G1USR G1 charset = user defined mapping */
839 case 'B': /* G1TXT G1 charset = ASCII mapping */
840 default:
841 unknown("escseq_g1", c);
842 break;
843 }
844 }
845
846 static void escseq_g2(void)
847 {
848 int c = readpty();
849 switch (c) {
850 case '8': /* G2DFL G2 charset = default mapping (ISO8859-1) */
851 case '0': /* G2GFX G2 charset = VT100 graphics mapping */
852 case 'U': /* G2ROM G2 charset = null mapping (straight to ROM) */
853 case 'K': /* G2USR G2 charset = user defined mapping */
854 default:
855 unknown("escseq_g2", c);
856 break;
857 }
858 }
859
860 static void escseq_g3(void)
861 {
862 int c = readpty();
863 switch (c) {
864 case '8': /* G3DFL G3 charset = default mapping (ISO8859-1) */
865 case '0': /* G3GFX G3 charset = VT100 graphics mapping */
866 case 'U': /* G3ROM G3 charset = null mapping (straight to ROM) */
867 case 'K': /* G3USR G3 charset = user defined mapping */
868 default:
869 unknown("escseq_g3", c);
870 break;
871 }
872 }
873
874 static int absrow(int r)
875 {
876 return origin() ? top + r : r;
877 }
878
879 #define CSIP(c) (((c) & 0xf0) == 0x30)
880 #define CSII(c) (((c) & 0xf0) == 0x20)
881 #define CSIF(c) ((c) >= 0x40 && (c) < 0x80)
882
883 #define MAXCSIARGS 32
884 /* ECMA-48 CSI sequences */
885 static void csiseq(void)
886 {
887 int args[MAXCSIARGS] = {0};
888 int i;
889 int n = 0;
890 int c = readpty();
891 int priv = 0;
892
893 if (strchr("<=>?", c)) {
894 priv = c;
895 c = readpty();
896 }
897 while (CSIP(c)) {
898 int arg = 0;
899 while (isdigit(c)) {
900 arg = arg * 10 + (c - '0');
901 c = readpty();
902 }
903 if (CSIP(c))
904 c = readpty();
905 if (n < MAXCSIARGS)
906 args[n++] = arg;
907 }
908 while (CSII(c))
909 c = readpty();
910 switch (c) {
911 case 'H': /* CUP move cursor to row, column */
912 case 'f': /* HVP move cursor to row, column */
913 move_cursor(absrow(MAX(0, args[0] - 1)), MAX(0, args[1] - 1));
914 break;
915 case 'J': /* ED erase display */
916 switch (args[0]) {
917 case 0:
918 kill_chars(col, pad_cols());
919 blank_rows(row + 1, pad_rows());
920 break;
921 case 1:
922 kill_chars(0, col + 1);
923 blank_rows(0, row - 1);
924 break;
925 case 2:
926 term_blank();
927 break;
928 }
929 break;
930 case 'A': /* CUU move cursor up */
931 advance(-MAX(1, args[0]), 0, 0);
932 break;
933 case 'e': /* VPR move cursor down */
934 case 'B': /* CUD move cursor down */
935 advance(MAX(1, args[0]), 0, 0);
936 break;
937 case 'a': /* HPR move cursor right */
938 case 'C': /* CUF move cursor right */
939 advance(0, MAX(1, args[0]), 0);
940 break;
941 case 'D': /* CUB move cursor left */
942 advance(0, -MAX(1, args[0]), 0);
943 break;
944 case 'K': /* EL erase line */
945 switch (args[0]) {
946 case 0:
947 kill_chars(col, pad_cols());
948 break;
949 case 1:
950 kill_chars(0, col + 1);
951 break;
952 case 2:
953 kill_chars(0, pad_cols());
954 break;
955 }
956 break;
957 case 'L': /* IL insert blank lines */
958 if (row >= top && row < bot)
959 insert_lines(MAX(1, args[0]));
960 break;
961 case 'M': /* DL delete lines */
962 if (row >= top && row < bot)
963 delete_lines(MAX(1, args[0]));
964 break;
965 case 'd': /* VPA move to row (current column) */
966 move_cursor(absrow(MAX(1, args[0]) - 1), col);
967 break;
968 case 'm': /* SGR set graphic rendition */
969 if (!n)
970 setattr(0);
971 for (i = 0; i < n; i++) {
972 if (args[i] == 38) {
973 fg = args[i + 2];
974 i += 2;
975 continue;
976 }
977 if (args[i] == 48) {
978 bg = args[i + 2];
979 i += 2;
980 continue;
981 }
982 setattr(args[i]);
983 }
984 break;
985 case 'r': /* DECSTBM set scrolling region to (top, bottom) rows */
986 set_region(args[0], args[1]);
987 break;
988 case 'c': /* DA return ESC [ ? 6 c (VT102) */
989 csiseq_da(priv == '?' ? args[0] | 0x80 : args[0]);
990 break;
991 case 'h': /* SM set mode */
992 for (i = 0; i < n; i++)
993 modeseq(priv == '?' ? args[i] | 0x80 : args[i], 1);
994 break;
995 case 'l': /* RM reset mode */
996 for (i = 0; i < n; i++)
997 modeseq(priv == '?' ? args[i] | 0x80 : args[i], 0);
998 break;
999 case 'P': /* DCH delete characters on current line */
1000 delete_chars(LIMIT(args[0], 1, pad_cols() - col));
1001 break;
1002 case '@': /* ICH insert blank characters */
1003 insert_chars(LIMIT(args[0], 1, pad_cols() - col));
1004 break;
1005 case 'n': /* DSR device status report */
1006 csiseq_dsr(args[0]);
1007 break;
1008 case 'G': /* CHA move cursor to column in current row */
1009 advance(0, MAX(0, args[0] - 1) - col, 0);
1010 break;
1011 case 'X': /* ECH erase characters on current line */
1012 kill_chars(col, MIN(col + MAX(1, args[0]), pad_cols()));
1013 break;
1014 case '[': /* IGN ignored control sequence */
1015 case 'E': /* CNL move cursor down and to column 1 */
1016 case 'F': /* CPL move cursor up and to column 1 */
1017 case 'g': /* TBC clear tab stop (CSI 3 g = clear all stops) */
1018 case 'q': /* DECLL set keyboard LEDs */
1019 case 's': /* CUPSV save cursor position */
1020 case 'u': /* CUPRS restore cursor position */
1021 case '`': /* HPA move cursor to column in current row */
1022 default:
1023 unknown("csiseq", c);
1024 break;
1025 }
1026 }
1027
1028 static void csiseq_da(int c)
1029 {
1030 switch (c) {
1031 case 0x00:
1032 term_sendstr("\x1b[?6c");
1033 break;
1034 default:
1035 /* we don't care much about cursor shape */
1036 /* printf("csiseq_da <0x%x>\n", c); */
1037 break;
1038 }
1039 }
1040
1041 static void csiseq_dsr(int c)
1042 {
1043 char status[1 << 5];
1044 switch (c) {
1045 case 0x05:
1046 term_sendstr("\x1b[0n");
1047 break;
1048 case 0x06:
1049 sprintf(status, "\x1b[%d;%dR",
1050 (origin() ? row - top : row) + 1, col + 1);
1051 term_sendstr(status);
1052 break;
1053 default:
1054 unknown("csiseq_dsr", c);
1055 break;
1056 }
1057 }
1058
1059 /* ANSI/DEC specified modes for SM/RM ANSI Specified Modes */
1060 static void modeseq(int c, int set)
1061 {
1062 switch (c) {
1063 case 0x87: /* DECAWM Auto Wrap */
1064 mode = BIT_SET(mode, MODE_WRAP, set);
1065 break;
1066 case 0x99: /* DECTCEM Cursor on (set); Cursor off (reset) */
1067 mode = BIT_SET(mode, MODE_CURSOR, set);
1068 break;
1069 case 0x86: /* DECOM Sets relative coordinates (set); Sets absolute coordinates (reset) */
1070 mode = BIT_SET(mode, MODE_ORIGIN, set);
1071 break;
1072 case 0x14: /* LNM Line Feed / New Line Mode */
1073 mode = BIT_SET(mode, MODE_AUTOCR, set);
1074 break;
1075 case 0x04: /* IRM insertion/replacement mode (always reset) */
1076 mode = BIT_SET(mode, MODE_INSERT, set);
1077 break;
1078 case 0x00: /* IGN Error (Ignored) */
1079 case 0x01: /* GATM guarded-area transfer mode (ignored) */
1080 case 0x02: /* KAM keyboard action mode (always reset) */
1081 case 0x03: /* CRM control representation mode (always reset) */
1082 case 0x05: /* SRTM status-reporting transfer mode */
1083 case 0x06: /* ERM erasure mode (always set) */
1084 case 0x07: /* VEM vertical editing mode (ignored) */
1085 case 0x0a: /* HEM horizontal editing mode */
1086 case 0x0b: /* PUM positioning unit mode */
1087 case 0x0c: /* SRM send/receive mode (echo on/off) */
1088 case 0x0d: /* FEAM format effector action mode */
1089 case 0x0e: /* FETM format effector transfer mode */
1090 case 0x0f: /* MATM multiple area transfer mode */
1091 case 0x10: /* TTM transfer termination mode */
1092 case 0x11: /* SATM selected area transfer mode */
1093 case 0x12: /* TSM tabulation stop mode */
1094 case 0x13: /* EBM editing boundary mode */
1095 /* DEC Private Modes: "?NUM" -> (NUM | 0x80) */
1096 case 0x80: /* IGN Error (Ignored) */
1097 case 0x81: /* DECCKM Cursorkeys application (set); Cursorkeys normal (reset) */
1098 case 0x82: /* DECANM ANSI (set); VT52 (reset) */
1099 case 0x83: /* DECCOLM 132 columns (set); 80 columns (reset) */
1100 case 0x84: /* DECSCLM Jump scroll (set); Smooth scroll (reset) */
1101 case 0x85: /* DECSCNM Reverse screen (set); Normal screen (reset) */
1102 case 0x88: /* DECARM Auto Repeat */
1103 case 0x89: /* DECINLM Interlace */
1104 case 0x92: /* DECPFF Send FF to printer after print screen (set); No char after PS (reset) */
1105 case 0x93: /* DECPEX Print screen: prints full screen (set); prints scroll region (reset) */
1106 default:
1107 unknown("modeseq", c);
1108 break;
1109 }
1110 }
A small linux framebuffer virtual terminal