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fbpad: do not redraw the whole screen if it was already visible
[fbpad.git] / term.c
blobf24315d6be1588f59bbcb1cbe7e1fd677fff9287
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 i;
73 pad_blankrow(r, bgcolor());
74 for (i = 0; i < pad_cols(); i++) {
75 int c = screen[OFFSET(r, i)];
76 if ((c && c != ' ') || bgs[OFFSET(r, i)] != bgcolor())
77 _draw_pos(r, i, 0);
78 }
79 }
80
81 static int candraw(int sr, int er)
82 {
83 int i;
84 if (lazy)
85 for (i = sr; i < er; i++)
86 dirty[i] = 1;
87 return visible && !lazy;
88 }
89
90 static void draw_rows(int sr, int er)
91 {
92 int i;
93 if (candraw(sr, er))
94 for (i = sr; i < er; i++)
95 _draw_row(i);
96 }
97
98 static void draw_cols(int r, int sc, int ec)
99 {
100 int i;
101 if (candraw(r, r + 1))
102 for (i = sc; i < ec; i++)
103 _draw_pos(r, i, 0);
104 }
105
106 static void draw_char(int ch, int r, int c)
107 {
108 int i = OFFSET(r, c);
109 screen[i] = ch;
110 fgs[i] = fgcolor();
111 bgs[i] = bgcolor();
112 if (candraw(r, r + 1))
113 _draw_pos(r, c, 0);
114 }
115
116 static void draw_cursor(int put)
117 {
118 if (candraw(row, row + 1))
119 _draw_pos(row, col, put);
120 }
121
122 static void lazy_start(void)
123 {
124 memset(dirty, 0, sizeof(term->dirty));
125 lazy = 1;
126 }
127
128 static void lazy_flush(void)
129 {
130 int i;
131 if (!visible || !lazy)
132 return;
133 for (i = 0; i < pad_rows(); i++)
134 if (dirty[i])
135 _draw_row(i);
136 if (dirty[row])
137 _draw_pos(row, col, 1);
138 lazy = 0;
139 }
140
141 static void screen_reset(int i, int n)
142 {
143 int c;
144 candraw(i / pad_cols(), (i + n) / pad_cols() + 1);
145 memset(screen + i, 0, n * sizeof(*screen));
146 for (c = 0; c < n; c++)
147 fgs[i + c] = fg;
148 for (c = 0; c < n; c++)
149 bgs[i + c] = bg;
150 }
151
152 static void screen_move(int dst, int src, int n)
153 {
154 if (n > 0)
155 candraw(MIN(src, dst) / pad_cols(), (MAX(src, dst) + n) / pad_cols() + 1);
156 else
157 candraw((MIN(src, dst) + n) / pad_cols(), MAX(src, dst) / pad_cols() + 1);
158 memmove(screen + dst, screen + src, n * sizeof(*screen));
159 memmove(fgs + dst, fgs + src, n * sizeof(*fgs));
160 memmove(bgs + dst, bgs + src, n * sizeof(*bgs));
161 }
162
163 /* terminal input buffering */
164
165 #define PTYLEN (1 << 16)
166
167 static char ptybuf[PTYLEN]; /* always emptied in term_read() */
168 static int ptylen; /* buffer length */
169 static int ptycur; /* current offset */
170
171 static int waitpty(int us)
172 {
173 struct pollfd ufds[1];
174 ufds[0].fd = term->fd;
175 ufds[0].events = POLLIN;
176 return poll(ufds, 1, us) <= 0;
177 }
178
179 static int readpty(void)
180 {
181 int nr;
182 if (ptycur < ptylen)
183 return (unsigned char) ptybuf[ptycur++];
184 if (!term->fd)
185 return -1;
186 ptylen = 0;
187 while ((nr = read(term->fd, ptybuf + ptylen, PTYLEN - ptylen)) > 0)
188 ptylen += nr;
189 if (!ptylen && errno == EAGAIN && !waitpty(100))
190 ptylen = read(term->fd, ptybuf, PTYLEN);
191 ptycur = 1;
192 return ptylen > 0 ? (unsigned char) ptybuf[0] : -1;
193 }
194
195 /* term interface functions */
196
197 void term_send(int c)
198 {
199 char b = c;
200 if (term->fd)
201 write(term->fd, &b, 1);
202 }
203
204 static void term_sendstr(char *s)
205 {
206 if (term->fd)
207 write(term->fd, s, strlen(s));
208 }
209
210 static void term_blank(void)
211 {
212 screen_reset(0, pad_rows() * pad_cols());
213 if (visible)
214 pad_blank(bgcolor());
215 }
216
217 static void ctlseq(void);
218 void term_read(void)
219 {
220 ctlseq();
221 while (ptycur < ptylen) {
222 if (visible && !lazy && ptylen - ptycur > 15)
223 lazy_start();
224 ctlseq();
225 }
226 lazy_flush();
227 }
228
229 static void term_reset(void)
230 {
231 row = col = 0;
232 top = 0;
233 bot = pad_rows();
234 mode = MODE_DEFAULT;
235 fg = FGCOLOR;
236 bg = BGCOLOR;
237 term_blank();
238 }
239
240 static int _openpty(int *master, int *slave)
241 {
242 int unlock = 0;
243 int ptyno = 0;
244 char name[20];
245 if ((*master = open("/dev/ptmx", O_RDWR)) == -1)
246 return -1;
247 if (ioctl(*master, TIOCSPTLCK, &unlock) == -1)
248 return -1;
249 if (ioctl(*master, TIOCGPTN, &ptyno) == -1)
250 return -1;
251 sprintf(name, "/dev/pts/%d", ptyno);
252 *slave = open(name, O_RDWR | O_NOCTTY);
253 return 0;
254 }
255
256 static void _login(int fd)
257 {
258 struct winsize winp;
259 winp.ws_col = pad_cols();
260 winp.ws_row = pad_rows();
261 winp.ws_xpixel = 0;
262 winp.ws_ypixel = 0;
263 setsid();
264 ioctl(fd, TIOCSCTTY, NULL);
265 ioctl(fd, TIOCSWINSZ, &winp);
266 dup2(fd, 0);
267 dup2(fd, 1);
268 dup2(fd, 2);
269 if (fd > 2)
270 close(fd);
271 }
272
273 #define MAXENV (1 << 8)
274
275 static void envcpy(char **d, char **s)
276 {
277 while (*s)
278 *d++ = *s++;
279 *d = NULL;
280 }
281
282 static void execvep(char *cmd, char **argv, char **envp)
283 {
284 char path[512];
285 char *p = getenv("PATH");
286 execve(cmd, argv, envp);
287 while (*p) {
288 char *s = path;
289 while (*p && *p != ':')
290 *s++ = *p++;
291 *s++ = '/';
292 strcpy(s, cmd);
293 execve(path, argv, envp);
294 while (*p == ':')
295 p++;
296 }
297 }
298
299 extern char **environ;
300 void term_exec(char **args)
301 {
302 int master, slave;
303 memset(term, 0, sizeof(*term));
304 if (_openpty(&master, &slave) == -1)
305 return;
306 if ((term->pid = fork()) == -1)
307 return;
308 if (!term->pid) {
309 char *envp[MAXENV] = {"TERM=linux"};
310 envcpy(envp + 1, environ);
311 _login(slave);
312 close(master);
313 execvep(args[0], args, envp);
314 exit(1);
315 }
316 close(slave);
317 term->fd = master;
318 fcntl(term->fd, F_SETFD, fcntl(term->fd, F_GETFD) | FD_CLOEXEC);
319 fcntl(term->fd, F_SETFL, fcntl(term->fd, F_GETFL) | O_NONBLOCK);
320 term_reset();
321 memset(term->hist, 0, sizeof(term->hist));
322 }
323
324 static void misc_save(struct term_state *state)
325 {
326 state->row = row;
327 state->col = col;
328 state->fg = fg;
329 state->bg = bg;
330 state->mode = mode;
331 }
332
333 static void misc_load(struct term_state *state)
334 {
335 row = state->row;
336 col = state->col;
337 fg = state->fg;
338 bg = state->bg;
339 mode = state->mode;
340 }
341
342 void term_save(struct term *term)
343 {
344 visible = 0;
345 if (!lazy)
346 lazy_start();
347 misc_save(&term->cur);
348 term->top = top;
349 term->bot = bot;
350 term->lazy = lazy;
351 }
352
353 void term_redraw(int all)
354 {
355 if (term->fd) {
356 if (all) {
357 lazy_start();
358 memset(dirty, 1, sizeof(term->dirty));
359 }
360 lazy_flush();
361 } else {
362 if (all)
363 pad_blank(0);
364 }
365 }
366
367 void term_load(struct term *t, int flags)
368 {
369 term = t;
370 misc_load(&term->cur);
371 screen = term->screen;
372 fgs = term->fgs;
373 bgs = term->bgs;
374 visible = flags;
375 top = term->top;
376 bot = term->bot;
377 lazy = term->lazy;
378 dirty = term->dirty;
379 }
380
381 void term_end(void)
382 {
383 if (term->fd)
384 close(term->fd);
385 memset(term, 0, sizeof(*term));
386 term_load(term, visible);
387 if (visible)
388 term_redraw(1);
389 }
390
391 static int writeutf8(char *dst, int c)
392 {
393 char *d = dst;
394 int l;
395 if (c > 0xffff) {
396 *d++ = 0xf0 | (c >> 18);
397 l = 3;
398 } else if (c > 0x7ff) {
399 *d++ = 0xe0 | (c >> 12);
400 l = 2;
401 } else if (c > 0x7f) {
402 *d++ = 0xc0 | (c >> 6);
403 l = 1;
404 } else {
405 *d++ = c > 0 ? c : ' ';
406 l = 0;
407 }
408 while (l--)
409 *d++ = 0x80 | ((c >> (l * 6)) & 0x3f);
410 return d - dst;
411 }
412
413 void term_screenshot(void)
414 {
415 char buf[1 << 11];
416 int fd = open(SCRSHOT, O_CREAT | O_TRUNC | O_WRONLY, 0600);
417 int i, j;
418 for (i = 0; i < pad_rows(); i++) {
419 char *s = buf;
420 for (j = 0; j < pad_cols(); j++)
421 if (~screen[OFFSET(i, j)] & DWCHAR)
422 s += writeutf8(s, screen[OFFSET(i, j)]);
423 *s++ = '\n';
424 write(fd, buf, s - buf);
425 }
426 close(fd);
427 }
428
429 /* high-level drawing functions */
430
431 static void empty_rows(int sr, int er)
432 {
433 screen_reset(OFFSET(sr, 0), (er - sr) * pad_cols());
434 }
435
436 static void blank_rows(int sr, int er)
437 {
438 empty_rows(sr, er);
439 draw_rows(sr, er);
440 draw_cursor(1);
441 }
442
443 #define HISTROW(pos) (term->hist + ((term->histtail + NHIST - (pos)) % NHIST) * pad_cols())
444
445 static void scrl_rows(int nr)
446 {
447 int i;
448 for (i = 0; i < nr; i++) {
449 memcpy(HISTROW(0), screen + i * pad_cols(),
450 pad_cols() * sizeof(screen[0]));
451 term->histtail = (term->histtail + 1) % NHIST;
452 }
453 }
454
455 void term_hist(int scrl)
456 {
457 int i, j;
458 if (!scrl) {
459 lazy_flush();
460 return;
461 }
462 lazy_start();
463 memset(dirty, 1, sizeof(term->dirty));
464 for (i = 0; i < pad_rows(); i++) {
465 int off = (i - scrl) * pad_cols();
466 int *_scr = i < scrl ? HISTROW(scrl - i) : term->screen + off;
467 short *_fgs = i < scrl ? NULL : term->fgs + off;
468 short *_bgs = i < scrl ? NULL : term->bgs + off;
469 for (j = 0; j < pad_cols(); j++)
470 pad_put(_scr[j], i, j, _fgs ? _fgs[j] : BGCOLOR,
471 _bgs ? _bgs[j] : FGCOLOR);
472 }
473 }
474
475 static void scroll_screen(int sr, int nr, int n)
476 {
477 draw_cursor(0);
478 if (sr + n == 0)
479 scrl_rows(sr);
480 screen_move(OFFSET(sr + n, 0), OFFSET(sr, 0), nr * pad_cols());
481 if (n > 0)
482 empty_rows(sr, sr + n);
483 else
484 empty_rows(sr + nr + n, sr + nr);
485 draw_rows(MIN(sr, sr + n), MAX(sr + nr, sr + nr + n));
486 draw_cursor(1);
487 }
488
489 static void insert_lines(int n)
490 {
491 int sr = MAX(top, row);
492 int nr = bot - row - n;
493 if (nr > 0)
494 scroll_screen(sr, nr, n);
495 }
496
497 static void delete_lines(int n)
498 {
499 int r = MAX(top, row);
500 int sr = r + n;
501 int nr = bot - r - n;
502 if (nr > 0)
503 scroll_screen(sr, nr, -n);
504 }
505
506 static int origin(void)
507 {
508 return mode & MODE_ORIGIN;
509 }
510
511 static void move_cursor(int r, int c)
512 {
513 int t, b;
514 draw_cursor(0);
515 t = origin() ? top : 0;
516 b = origin() ? bot : pad_rows();
517 row = LIMIT(r, t, b - 1);
518 col = LIMIT(c, 0, pad_cols() - 1);
519 draw_cursor(1);
520 mode = BIT_SET(mode, MODE_WRAPREADY, 0);
521 }
522
523 static void set_region(int t, int b)
524 {
525 top = LIMIT(t - 1, 0, pad_rows() - 1);
526 bot = LIMIT(b ? b : pad_rows(), top + 1, pad_rows());
527 if (origin())
528 move_cursor(top, 0);
529 }
530
531 static void setattr(int m)
532 {
533 switch (m) {
534 case 0:
535 fg = FGCOLOR;
536 bg = BGCOLOR;
537 mode &= ~ATTR_ALL;
538 break;
539 case 1:
540 mode |= ATTR_BOLD;
541 break;
542 case 3:
543 mode |= ATTR_ITALIC;
544 break;
545 case 7:
546 mode |= ATTR_REV;
547 break;
548 case 22:
549 mode &= ~ATTR_BOLD;
550 break;
551 case 23:
552 mode &= ~ATTR_ITALIC;
553 break;
554 case 27:
555 mode &= ~ATTR_REV;
556 break;
557 default:
558 if ((m / 10) == 3)
559 fg = m > 37 ? FGCOLOR : m - 30;
560 if ((m / 10) == 4)
561 bg = m > 47 ? BGCOLOR : m - 40;
562 if ((m / 10) == 9)
563 fg = 8 + m - 90;
564 if ((m / 10) == 10)
565 bg = 8 + m - 100;
566 }
567 }
568
569 static void kill_chars(int sc, int ec)
570 {
571 int i;
572 for (i = sc; i < ec; i++)
573 draw_char(0, row, i);
574 draw_cursor(1);
575 }
576
577 static void move_chars(int sc, int nc, int n)
578 {
579 draw_cursor(0);
580 screen_move(OFFSET(row, sc + n), OFFSET(row, sc), nc);
581 if (n > 0)
582 screen_reset(OFFSET(row, sc), n);
583 else
584 screen_reset(OFFSET(row, pad_cols() + n), -n);
585 draw_cols(row, MIN(sc, sc + n), pad_cols());
586 draw_cursor(1);
587 }
588
589 static void delete_chars(int n)
590 {
591 int sc = col + n;
592 int nc = pad_cols() - sc;
593 move_chars(sc, nc, -n);
594 }
595
596 static void insert_chars(int n)
597 {
598 int nc = pad_cols() - col - n;
599 move_chars(col, nc, n);
600 }
601
602 static void advance(int dr, int dc, int scrl)
603 {
604 int r = row + dr;
605 int c = col + dc;
606 if (dr && r >= bot && scrl) {
607 int n = bot - r - 1;
608 int nr = (bot - top) + n;
609 scroll_screen(top + -n, nr, n);
610 }
611 if (dr && r < top && scrl) {
612 int n = top - r;
613 int nr = (bot - top) - n;
614 scroll_screen(top, nr, n);
615 }
616 r = dr ? LIMIT(r, top, bot - 1) : r;
617 c = LIMIT(c, 0, pad_cols() - 1);
618 move_cursor(r, c);
619 }
620
621 static void insertchar(int c)
622 {
623 if (mode & MODE_WRAPREADY)
624 advance(1, -col, 1);
625 if (mode & MODE_INSERT)
626 insert_chars(1);
627 draw_char(c, row, col);
628 if (col == pad_cols() - 1)
629 mode = BIT_SET(mode, MODE_WRAPREADY, 1);
630 else
631 advance(0, 1, 1);
632 }
633
634
635 /* partial vt102 implementation */
636
637 static void escseq(void);
638 static void escseq_cs(void);
639 static void escseq_g0(void);
640 static void escseq_g1(void);
641 static void escseq_g2(void);
642 static void escseq_g3(void);
643 static void csiseq(void);
644 static void csiseq_da(int c);
645 static void csiseq_dsr(int c);
646 static void modeseq(int c, int set);
647
648 /* comments taken from: http://www.ivarch.com/programs/termvt102.shtml */
649
650 static int readutf8(int c)
651 {
652 int result;
653 int l = 1;
654 if (~c & 0xc0)
655 return c;
656 while (l < 6 && c & (0x40 >> l))
657 l++;
658 result = (0x3f >> l) & c;
659 while (l--)
660 result = (result << 6) | (readpty() & 0x3f);
661 return result;
662 }
663
664 #define unknown(ctl, c)
665
666 /* control sequences */
667 static void ctlseq(void)
668 {
669 int c = readpty();
670 switch (c) {
671 case 0x09: /* HT horizontal tab to next tab stop */
672 advance(0, 8 - col % 8, 0);
673 break;
674 case 0x0a: /* LF line feed */
675 case 0x0b: /* VT line feed */
676 case 0x0c: /* FF line feed */
677 advance(1, (mode & MODE_AUTOCR) ? -col : 0, 1);
678 break;
679 case 0x08: /* BS backspace one column */
680 advance(0, -1, 0);
681 break;
682 case 0x1b: /* ESC start escape sequence */
683 escseq();
684 break;
685 case 0x0d: /* CR carriage return */
686 advance(0, -col, 0);
687 break;
688 case 0x00: /* NUL ignored */
689 case 0x07: /* BEL beep */
690 case 0x7f: /* DEL ignored */
691 break;
692 case 0x05: /* ENQ trigger answerback message */
693 case 0x0e: /* SO activate G1 character set & newline */
694 case 0x0f: /* SI activate G0 character set */
695 case 0x11: /* XON resume transmission */
696 case 0x13: /* XOFF stop transmission, ignore characters */
697 case 0x18: /* CAN interrupt escape sequence */
698 case 0x1a: /* SUB interrupt escape sequence */
699 case 0x9b: /* CSI equivalent to ESC [ */
700 unknown("ctlseq", c);
701 break;
702 default:
703 c = readutf8(c);
704 if (isdw(c) && col + 1 == pad_cols() && ~mode & MODE_WRAPREADY)
705 insertchar(0);
706 if (!iszw(c))
707 insertchar(c);
708 if (isdw(c))
709 insertchar(c | DWCHAR);
710 break;
711 }
712 }
713
714 #define ESCM(c) (((c) & 0xf0) == 0x20)
715 #define ESCF(c) ((c) > 0x30 && (c) < 0x7f)
716
717 /* escape sequences */
718 static void escseq(void)
719 {
720 int c = readpty();
721 while (ESCM(c))
722 c = readpty();
723 switch (c) {
724 case '[': /* CSI control sequence introducer */
725 csiseq();
726 break;
727 case '%': /* CS... escseq_cs table */
728 escseq_cs();
729 break;
730 case '(': /* G0... escseq_g0 table */
731 escseq_g0();
732 break;
733 case ')': /* G1... escseq_g1 table */
734 escseq_g1();
735 break;
736 case '*': /* G2... escseq_g2 table */
737 escseq_g2();
738 break;
739 case '+': /* G3... escseq_g3 table */
740 escseq_g3();
741 break;
742 case '7': /* DECSC save state (position, charset, attributes) */
743 misc_save(&term->sav);
744 break;
745 case '8': /* DECRC restore most recently saved state */
746 misc_load(&term->sav);
747 break;
748 case 'M': /* RI reverse line feed */
749 advance(-1, 0, 1);
750 break;
751 case 'D': /* IND line feed */
752 advance(1, 0, 1);
753 break;
754 case 'E': /* NEL newline */
755 advance(1, -col, 1);
756 break;
757 case 'c': /* RIS reset */
758 term_reset();
759 break;
760 case 'H': /* HTS set tab stop at current column */
761 case 'Z': /* DECID DEC private ID; return ESC [ ? 6 c (VT102) */
762 case '#': /* DECALN ("#8") DEC alignment test - fill screen with E's */
763 case '>': /* DECPNM set numeric keypad mode */
764 case '=': /* DECPAM set application keypad mode */
765 case 'N': /* SS2 select G2 charset for next char only */
766 case 'O': /* SS3 select G3 charset for next char only */
767 case 'P': /* DCS device control string (ended by ST) */
768 case 'X': /* SOS start of string */
769 case '^': /* PM privacy message (ended by ST) */
770 case '_': /* APC application program command (ended by ST) */
771 case '\\': /* ST string terminator */
772 case 'n': /* LS2 invoke G2 charset */
773 case 'o': /* LS3 invoke G3 charset */
774 case '|': /* LS3R invoke G3 charset as GR */
775 case '}': /* LS2R invoke G2 charset as GR */
776 case '~': /* LS1R invoke G1 charset as GR */
777 case ']': /* OSC operating system command */
778 case 'g': /* BEL alternate BEL */
779 default:
780 unknown("escseq", c);
781 break;
782 }
783 }
784
785 static void escseq_cs(void)
786 {
787 int c = readpty();
788 switch (c) {
789 case '@': /* CSDFL select default charset (ISO646/8859-1) */
790 case 'G': /* CSUTF8 select UTF-8 */
791 case '8': /* CSUTF8 select UTF-8 (obsolete) */
792 default:
793 unknown("escseq_cs", c);
794 break;
795 }
796 }
797
798 static void escseq_g0(void)
799 {
800 int c = readpty();
801 switch (c) {
802 case '8': /* G0DFL G0 charset = default mapping (ISO8859-1) */
803 case '0': /* G0GFX G0 charset = VT100 graphics mapping */
804 case 'U': /* G0ROM G0 charset = null mapping (straight to ROM) */
805 case 'K': /* G0USR G0 charset = user defined mapping */
806 case 'B': /* G0TXT G0 charset = ASCII mapping */
807 default:
808 unknown("escseq_g0", c);
809 break;
810 }
811 }
812
813 static void escseq_g1(void)
814 {
815 int c = readpty();
816 switch (c) {
817 case '8': /* G1DFL G1 charset = default mapping (ISO8859-1) */
818 case '0': /* G1GFX G1 charset = VT100 graphics mapping */
819 case 'U': /* G1ROM G1 charset = null mapping (straight to ROM) */
820 case 'K': /* G1USR G1 charset = user defined mapping */
821 case 'B': /* G1TXT G1 charset = ASCII mapping */
822 default:
823 unknown("escseq_g1", c);
824 break;
825 }
826 }
827
828 static void escseq_g2(void)
829 {
830 int c = readpty();
831 switch (c) {
832 case '8': /* G2DFL G2 charset = default mapping (ISO8859-1) */
833 case '0': /* G2GFX G2 charset = VT100 graphics mapping */
834 case 'U': /* G2ROM G2 charset = null mapping (straight to ROM) */
835 case 'K': /* G2USR G2 charset = user defined mapping */
836 default:
837 unknown("escseq_g2", c);
838 break;
839 }
840 }
841
842 static void escseq_g3(void)
843 {
844 int c = readpty();
845 switch (c) {
846 case '8': /* G3DFL G3 charset = default mapping (ISO8859-1) */
847 case '0': /* G3GFX G3 charset = VT100 graphics mapping */
848 case 'U': /* G3ROM G3 charset = null mapping (straight to ROM) */
849 case 'K': /* G3USR G3 charset = user defined mapping */
850 default:
851 unknown("escseq_g3", c);
852 break;
853 }
854 }
855
856 static int absrow(int r)
857 {
858 return origin() ? top + r : r;
859 }
860
861 #define CSIP(c) (((c) & 0xf0) == 0x30)
862 #define CSII(c) (((c) & 0xf0) == 0x20)
863 #define CSIF(c) ((c) >= 0x40 && (c) < 0x80)
864
865 #define MAXCSIARGS 32
866 /* ECMA-48 CSI sequences */
867 static void csiseq(void)
868 {
869 int args[MAXCSIARGS] = {0};
870 int i;
871 int n = 0;
872 int c = readpty();
873 int priv = 0;
874
875 if (strchr("<=>?", c)) {
876 priv = c;
877 c = readpty();
878 }
879 while (CSIP(c)) {
880 int arg = 0;
881 while (isdigit(c)) {
882 arg = arg * 10 + (c - '0');
883 c = readpty();
884 }
885 if (CSIP(c))
886 c = readpty();
887 if (n < MAXCSIARGS)
888 args[n++] = arg;
889 }
890 while (CSII(c))
891 c = readpty();
892 switch (c) {
893 case 'H': /* CUP move cursor to row, column */
894 case 'f': /* HVP move cursor to row, column */
895 move_cursor(absrow(MAX(0, args[0] - 1)), MAX(0, args[1] - 1));
896 break;
897 case 'J': /* ED erase display */
898 switch (args[0]) {
899 case 0:
900 kill_chars(col, pad_cols());
901 blank_rows(row + 1, pad_rows());
902 break;
903 case 1:
904 kill_chars(0, col + 1);
905 blank_rows(0, row - 1);
906 break;
907 case 2:
908 term_blank();
909 break;
910 }
911 break;
912 case 'A': /* CUU move cursor up */
913 advance(-MAX(1, args[0]), 0, 0);
914 break;
915 case 'e': /* VPR move cursor down */
916 case 'B': /* CUD move cursor down */
917 advance(MAX(1, args[0]), 0, 0);
918 break;
919 case 'a': /* HPR move cursor right */
920 case 'C': /* CUF move cursor right */
921 advance(0, MAX(1, args[0]), 0);
922 break;
923 case 'D': /* CUB move cursor left */
924 advance(0, -MAX(1, args[0]), 0);
925 break;
926 case 'K': /* EL erase line */
927 switch (args[0]) {
928 case 0:
929 kill_chars(col, pad_cols());
930 break;
931 case 1:
932 kill_chars(0, col + 1);
933 break;
934 case 2:
935 kill_chars(0, pad_cols());
936 break;
937 }
938 break;
939 case 'L': /* IL insert blank lines */
940 if (row >= top && row < bot)
941 insert_lines(MAX(1, args[0]));
942 break;
943 case 'M': /* DL delete lines */
944 if (row >= top && row < bot)
945 delete_lines(MAX(1, args[0]));
946 break;
947 case 'd': /* VPA move to row (current column) */
948 move_cursor(absrow(MAX(1, args[0]) - 1), col);
949 break;
950 case 'm': /* SGR set graphic rendition */
951 if (!n)
952 setattr(0);
953 for (i = 0; i < n; i++) {
954 if (args[i] == 38) {
955 fg = args[i + 2];
956 i += 2;
957 continue;
958 }
959 if (args[i] == 48) {
960 bg = args[i + 2];
961 i += 2;
962 continue;
963 }
964 setattr(args[i]);
965 }
966 break;
967 case 'r': /* DECSTBM set scrolling region to (top, bottom) rows */
968 set_region(args[0], args[1]);
969 break;
970 case 'c': /* DA return ESC [ ? 6 c (VT102) */
971 csiseq_da(priv == '?' ? args[0] | 0x80 : args[0]);
972 break;
973 case 'h': /* SM set mode */
974 for (i = 0; i < n; i++)
975 modeseq(priv == '?' ? args[i] | 0x80 : args[i], 1);
976 break;
977 case 'l': /* RM reset mode */
978 for (i = 0; i < n; i++)
979 modeseq(priv == '?' ? args[i] | 0x80 : args[i], 0);
980 break;
981 case 'P': /* DCH delete characters on current line */
982 delete_chars(LIMIT(args[0], 1, pad_cols() - col));
983 break;
984 case '@': /* ICH insert blank characters */
985 insert_chars(LIMIT(args[0], 1, pad_cols() - col));
986 break;
987 case 'n': /* DSR device status report */
988 csiseq_dsr(args[0]);
989 break;
990 case 'G': /* CHA move cursor to column in current row */
991 advance(0, MAX(0, args[0] - 1) - col, 0);
992 break;
993 case 'X': /* ECH erase characters on current line */
994 kill_chars(col, MIN(col + MAX(1, args[0]), pad_cols()));
995 break;
996 case '[': /* IGN ignored control sequence */
997 case 'E': /* CNL move cursor down and to column 1 */
998 case 'F': /* CPL move cursor up and to column 1 */
999 case 'g': /* TBC clear tab stop (CSI 3 g = clear all stops) */
1000 case 'q': /* DECLL set keyboard LEDs */
1001 case 's': /* CUPSV save cursor position */
1002 case 'u': /* CUPRS restore cursor position */
1003 case '`': /* HPA move cursor to column in current row */
1004 default:
1005 unknown("csiseq", c);
1006 break;
1007 }
1008 }
1009
1010 static void csiseq_da(int c)
1011 {
1012 switch (c) {
1013 case 0x00:
1014 term_sendstr("\x1b[?6c");
1015 break;
1016 default:
1017 /* we don't care much about cursor shape */
1018 /* printf("csiseq_da <0x%x>\n", c); */
1019 break;
1020 }
1021 }
1022
1023 static void csiseq_dsr(int c)
1024 {
1025 char status[1 << 5];
1026 switch (c) {
1027 case 0x05:
1028 term_sendstr("\x1b[0n");
1029 break;
1030 case 0x06:
1031 sprintf(status, "\x1b[%d;%dR",
1032 (origin() ? row - top : row) + 1, col + 1);
1033 term_sendstr(status);
1034 break;
1035 default:
1036 unknown("csiseq_dsr", c);
1037 break;
1038 }
1039 }
1040
1041 /* ANSI/DEC specified modes for SM/RM ANSI Specified Modes */
1042 static void modeseq(int c, int set)
1043 {
1044 switch (c) {
1045 case 0x87: /* DECAWM Auto Wrap */
1046 mode = BIT_SET(mode, MODE_WRAP, set);
1047 break;
1048 case 0x99: /* DECTCEM Cursor on (set); Cursor off (reset) */
1049 mode = BIT_SET(mode, MODE_CURSOR, set);
1050 break;
1051 case 0x86: /* DECOM Sets relative coordinates (set); Sets absolute coordinates (reset) */
1052 mode = BIT_SET(mode, MODE_ORIGIN, set);
1053 break;
1054 case 0x14: /* LNM Line Feed / New Line Mode */
1055 mode = BIT_SET(mode, MODE_AUTOCR, set);
1056 break;
1057 case 0x04: /* IRM insertion/replacement mode (always reset) */
1058 mode = BIT_SET(mode, MODE_INSERT, set);
1059 break;
1060 case 0x00: /* IGN Error (Ignored) */
1061 case 0x01: /* GATM guarded-area transfer mode (ignored) */
1062 case 0x02: /* KAM keyboard action mode (always reset) */
1063 case 0x03: /* CRM control representation mode (always reset) */
1064 case 0x05: /* SRTM status-reporting transfer mode */
1065 case 0x06: /* ERM erasure mode (always set) */
1066 case 0x07: /* VEM vertical editing mode (ignored) */
1067 case 0x0a: /* HEM horizontal editing mode */
1068 case 0x0b: /* PUM positioning unit mode */
1069 case 0x0c: /* SRM send/receive mode (echo on/off) */
1070 case 0x0d: /* FEAM format effector action mode */
1071 case 0x0e: /* FETM format effector transfer mode */
1072 case 0x0f: /* MATM multiple area transfer mode */
1073 case 0x10: /* TTM transfer termination mode */
1074 case 0x11: /* SATM selected area transfer mode */
1075 case 0x12: /* TSM tabulation stop mode */
1076 case 0x13: /* EBM editing boundary mode */
1077 /* DEC Private Modes: "?NUM" -> (NUM | 0x80) */
1078 case 0x80: /* IGN Error (Ignored) */
1079 case 0x81: /* DECCKM Cursorkeys application (set); Cursorkeys normal (reset) */
1080 case 0x82: /* DECANM ANSI (set); VT52 (reset) */
1081 case 0x83: /* DECCOLM 132 columns (set); 80 columns (reset) */
1082 case 0x84: /* DECSCLM Jump scroll (set); Smooth scroll (reset) */
1083 case 0x85: /* DECSCNM Reverse screen (set); Normal screen (reset) */
1084 case 0x88: /* DECARM Auto Repeat */
1085 case 0x89: /* DECINLM Interlace */
1086 case 0x92: /* DECPFF Send FF to printer after print screen (set); No char after PS (reset) */
1087 case 0x93: /* DECPEX Print screen: prints full screen (set); prints scroll region (reset) */
1088 default:
1089 unknown("modeseq", c);
1090 break;
1091 }
1092 }
A small linux framebuffer virtual terminal