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term: continue reading from pty if more data is available
[fbpad.git] / term.c
blobda41fae95181540fd80ac34c9f252d35e764e355
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 char *fgs, *bgs;
34 static int row, col;
35 static char fg, bg;
36 static int top, bot;
37 static int mode;
38 static int visible;
39
40 /* low level drawing and lazy updating */
41
42 static int dirty[NROWS];
43 static int lazy;
44
45 static char fgcolor(void)
46 {
47 int c = mode & ATTR_REV ? bg : fg;
48 if (mode & ATTR_BOLD)
49 c |= FN_B;
50 if (mode & ATTR_ITALIC)
51 c |= FN_I;
52 return c;
53 }
54
55 static char bgcolor(void)
56 {
57 return mode & ATTR_REV ? fg : bg;
58 }
59
60 /* assumes visible && !lazy */
61 static void _draw_pos(int r, int c, int cursor)
62 {
63 int rev = cursor && mode & MODE_CURSOR;
64 int i = OFFSET(r, c);
65 char fg = rev ? bgs[i] : fgs[i];
66 char bg = rev ? fgs[i] : bgs[i];
67 pad_put(screen[i], r, c, fg, bg);
68 }
69
70 /* assumes visible && !lazy */
71 static void _draw_row(int r)
72 {
73 int i;
74 pad_blankrow(r, bgcolor());
75 for (i = 0; i < pad_cols(); i++) {
76 int c = screen[OFFSET(r, i)];
77 if ((c && c != ' ') || bgs[OFFSET(r, i)] != bgcolor())
78 _draw_pos(r, i, 0);
79 }
80 }
81
82 static int candraw(int sr, int er)
83 {
84 int i;
85 if (visible && !lazy)
86 return 1;
87 if (visible && lazy)
88 for (i = sr; i < er; i++)
89 dirty[i] = 1;
90 return 0;
91 }
92
93 static void draw_rows(int sr, int er)
94 {
95 int i;
96 if (candraw(sr, er))
97 for (i = sr; i < er; i++)
98 _draw_row(i);
99 }
100
101 static void draw_cols(int r, int sc, int ec)
102 {
103 int i;
104 if (candraw(r, r + 1))
105 for (i = sc; i < ec; i++)
106 _draw_pos(r, i, 0);
107 }
108
109 static void draw_char(int ch, int r, int c)
110 {
111 int i = OFFSET(r, c);
112 screen[i] = ch;
113 fgs[i] = fgcolor();
114 bgs[i] = bgcolor();
115 if (candraw(r, r + 1))
116 _draw_pos(r, c, 0);
117 }
118
119 static void draw_cursor(int put)
120 {
121 if (candraw(row, row + 1))
122 _draw_pos(row, col, put);
123 }
124
125 static void lazy_start(void)
126 {
127 memset(dirty, 0, sizeof(dirty));
128 lazy = 1;
129 }
130
131 static void lazy_flush(void)
132 {
133 int i;
134 if (!visible || !lazy)
135 return;
136 _draw_pos(row, col, 0);
137 for (i = 0; i < pad_rows(); i++)
138 if (dirty[i])
139 _draw_row(i);
140 _draw_pos(row, col, 1);
141 lazy = 0;
142 }
143
144 static void screen_reset(int i, int n)
145 {
146 memset(screen + i, 0, n * sizeof(*screen));
147 memset(fgs + i, fg, n);
148 memset(bgs + i, bg, n);
149 }
150
151 static void screen_move(int dst, int src, int n)
152 {
153 memmove(screen + dst, screen + src, n * sizeof(*screen));
154 memmove(fgs + dst, fgs + src, n);
155 memmove(bgs + dst, bgs + src, n);
156 }
157
158 /* terminal input buffering */
159
160 #define PTYLEN (1 << 16)
161
162 static char ptybuf[PTYLEN]; /* always emptied in term_read() */
163 static int ptylen; /* buffer length */
164 static int ptycur; /* current offset */
165
166 static int waitpty(int us)
167 {
168 struct pollfd ufds[1];
169 ufds[0].fd = term->fd;
170 ufds[0].events = POLLIN;
171 return poll(ufds, 1, us) <= 0;
172 }
173
174 static int readpty(void)
175 {
176 int nr;
177 if (ptycur < ptylen)
178 return (unsigned char) ptybuf[ptycur++];
179 if (!term->fd)
180 return -1;
181 ptylen = 0;
182 while ((nr = read(term->fd, ptybuf + ptylen, PTYLEN - ptylen)) > 0)
183 ptylen += nr;
184 if (!ptylen && errno == EAGAIN && !waitpty(100))
185 ptylen = read(term->fd, ptybuf, PTYLEN);
186 ptycur = 1;
187 return ptylen > 0 ? (unsigned char) ptybuf[0] : -1;
188 }
189
190 /* term interface functions */
191
192 void term_send(int c)
193 {
194 char b = c;
195 if (term->fd)
196 write(term->fd, &b, 1);
197 }
198
199 static void term_sendstr(char *s)
200 {
201 if (term->fd)
202 write(term->fd, s, strlen(s));
203 }
204
205 static void term_blank(void)
206 {
207 screen_reset(0, pad_rows() * pad_cols());
208 if (visible)
209 pad_blank(bgcolor());
210 }
211
212 static void ctlseq(void);
213 void term_read(void)
214 {
215 ctlseq();
216 while (ptycur < ptylen) {
217 if (visible && !lazy && ptylen - ptycur > 15)
218 lazy_start();
219 ctlseq();
220 }
221 lazy_flush();
222 }
223
224 static void term_reset(void)
225 {
226 row = col = 0;
227 top = 0;
228 bot = pad_rows();
229 mode = MODE_DEFAULT;
230 fg = FGCOLOR;
231 bg = BGCOLOR;
232 term_blank();
233 }
234
235 static int _openpty(int *master, int *slave)
236 {
237 int unlock = 0;
238 int ptyno = 0;
239 char name[20];
240 if ((*master = open("/dev/ptmx", O_RDWR)) == -1)
241 return -1;
242 if (ioctl(*master, TIOCSPTLCK, &unlock) == -1)
243 return -1;
244 if (ioctl(*master, TIOCGPTN, &ptyno) == -1)
245 return -1;
246 sprintf(name, "/dev/pts/%d", ptyno);
247 *slave = open(name, O_RDWR | O_NOCTTY);
248 return 0;
249 }
250
251 static void _login(int fd)
252 {
253 struct winsize winp;
254 winp.ws_col = pad_cols();
255 winp.ws_row = pad_rows();
256 winp.ws_xpixel = 0;
257 winp.ws_ypixel = 0;
258 setsid();
259 ioctl(fd, TIOCSCTTY, NULL);
260 ioctl(fd, TIOCSWINSZ, &winp);
261 dup2(fd, 0);
262 dup2(fd, 1);
263 dup2(fd, 2);
264 if (fd > 2)
265 close(fd);
266 }
267
268 #define MAXENV (1 << 8)
269
270 static void envcpy(char **d, char **s)
271 {
272 while (*s)
273 *d++ = *s++;
274 *d = NULL;
275 }
276
277 static void execvep(char *cmd, char **argv, char **envp)
278 {
279 char path[512];
280 char *p = getenv("PATH");
281 execve(cmd, argv, envp);
282 while (*p) {
283 char *s = path;
284 while (*p && *p != ':')
285 *s++ = *p++;
286 *s++ = '/';
287 strcpy(s, cmd);
288 execve(path, argv, envp);
289 while (*p == ':')
290 p++;
291 }
292 }
293
294 extern char **environ;
295 void term_exec(char **args)
296 {
297 int master, slave;
298 memset(term, 0, sizeof(*term));
299 if (_openpty(&master, &slave) == -1)
300 return;
301 if ((term->pid = fork()) == -1)
302 return;
303 if (!term->pid) {
304 char *envp[MAXENV] = {"TERM=linux"};
305 envcpy(envp + 1, environ);
306 _login(slave);
307 close(master);
308 execvep(args[0], args, envp);
309 exit(1);
310 }
311 close(slave);
312 term->fd = master;
313 fcntl(term->fd, F_SETFD, fcntl(term->fd, F_GETFD) | FD_CLOEXEC);
314 fcntl(term->fd, F_SETFL, fcntl(term->fd, F_GETFL) | O_NONBLOCK);
315 term_reset();
316 memset(term->hist, 0, sizeof(term->hist));
317 }
318
319 static void misc_save(struct term_state *state)
320 {
321 state->row = row;
322 state->col = col;
323 state->fg = fg;
324 state->bg = bg;
325 state->mode = mode;
326 }
327
328 static void misc_load(struct term_state *state)
329 {
330 row = state->row;
331 col = state->col;
332 fg = state->fg;
333 bg = state->bg;
334 mode = state->mode;
335 }
336
337 void term_save(struct term *term)
338 {
339 visible = 0;
340 misc_save(&term->cur);
341 term->top = top;
342 term->bot = bot;
343 }
344
345 void term_redraw(void)
346 {
347 if (term->fd) {
348 lazy_start();
349 memset(dirty, 1, sizeof(dirty));
350 lazy_flush();
351 } else {
352 pad_blank(0);
353 }
354 }
355
356 void term_load(struct term *t, int flags)
357 {
358 term = t;
359 misc_load(&term->cur);
360 screen = term->screen;
361 fgs = term->fgs;
362 bgs = term->bgs;
363 visible = flags;
364 top = term->top;
365 bot = term->bot;
366 }
367
368 void term_end(void)
369 {
370 if (term->fd)
371 close(term->fd);
372 memset(term, 0, sizeof(*term));
373 term_load(term, visible);
374 if (visible)
375 term_redraw();
376 }
377
378 static int writeutf8(char *dst, int c)
379 {
380 char *d = dst;
381 int l;
382 if (c > 0xffff) {
383 *d++ = 0xf0 | (c >> 18);
384 l = 3;
385 } else if (c > 0x7ff) {
386 *d++ = 0xe0 | (c >> 12);
387 l = 2;
388 } else if (c > 0x7f) {
389 *d++ = 0xc0 | (c >> 6);
390 l = 1;
391 } else {
392 *d++ = c > 0 ? c : ' ';
393 l = 0;
394 }
395 while (l--)
396 *d++ = 0x80 | ((c >> (l * 6)) & 0x3f);
397 return d - dst;
398 }
399
400 void term_screenshot(void)
401 {
402 char buf[1 << 11];
403 int fd = open(SCRSHOT, O_CREAT | O_TRUNC | O_WRONLY, 0600);
404 int i, j;
405 for (i = 0; i < pad_rows(); i++) {
406 char *s = buf;
407 for (j = 0; j < pad_cols(); j++)
408 if (~screen[OFFSET(i, j)] & DWCHAR)
409 s += writeutf8(s, screen[OFFSET(i, j)]);
410 *s++ = '\n';
411 write(fd, buf, s - buf);
412 }
413 close(fd);
414 }
415
416 /* high-level drawing functions */
417
418 static void empty_rows(int sr, int er)
419 {
420 screen_reset(OFFSET(sr, 0), (er - sr) * pad_cols());
421 }
422
423 static void blank_rows(int sr, int er)
424 {
425 empty_rows(sr, er);
426 draw_rows(sr, er);
427 draw_cursor(1);
428 }
429
430 #define HISTROW(pos) (term->hist + ((term->histtail + NHIST - (pos)) % NHIST) * pad_cols())
431
432 static void scrl_rows(int nr)
433 {
434 int i;
435 for (i = 0; i < nr; i++) {
436 memcpy(HISTROW(0), screen + i * pad_cols(),
437 pad_cols() * sizeof(screen[0]));
438 term->histtail = (term->histtail + 1) % NHIST;
439 }
440 }
441
442 void term_hist(int scrl)
443 {
444 int i, j;
445 if (!scrl) {
446 lazy_flush();
447 return;
448 }
449 lazy_start();
450 memset(dirty, 1, sizeof(dirty));
451 for (i = 0; i < pad_rows(); i++) {
452 int off = (i - scrl) * pad_cols();
453 int *_scr = i < scrl ? HISTROW(scrl - i) : term->screen + off;
454 char *_fgs = i < scrl ? NULL : term->fgs + off;
455 char *_bgs = i < scrl ? NULL : term->bgs + off;
456 for (j = 0; j < pad_cols(); j++)
457 pad_put(_scr[j], i, j, _fgs ? _fgs[j] : BGCOLOR,
458 _bgs ? _bgs[j] : FGCOLOR);
459 }
460 }
461
462 static void scroll_screen(int sr, int nr, int n)
463 {
464 draw_cursor(0);
465 if (sr + n == 0)
466 scrl_rows(sr);
467 screen_move(OFFSET(sr + n, 0), OFFSET(sr, 0), nr * pad_cols());
468 if (n > 0)
469 empty_rows(sr, sr + n);
470 else
471 empty_rows(sr + nr + n, sr + nr);
472 draw_rows(MIN(sr, sr + n), MAX(sr + nr, sr + nr + n));
473 draw_cursor(1);
474 }
475
476 static void insert_lines(int n)
477 {
478 int sr = MAX(top, row);
479 int nr = bot - row - n;
480 if (nr > 0)
481 scroll_screen(sr, nr, n);
482 }
483
484 static void delete_lines(int n)
485 {
486 int r = MAX(top, row);
487 int sr = r + n;
488 int nr = bot - r - n;
489 if (nr > 0)
490 scroll_screen(sr, nr, -n);
491 }
492
493 static int origin(void)
494 {
495 return mode & MODE_ORIGIN;
496 }
497
498 static void move_cursor(int r, int c)
499 {
500 int t, b;
501 draw_cursor(0);
502 t = origin() ? top : 0;
503 b = origin() ? bot : pad_rows();
504 row = LIMIT(r, t, b - 1);
505 col = LIMIT(c, 0, pad_cols() - 1);
506 draw_cursor(1);
507 mode = BIT_SET(mode, MODE_WRAPREADY, 0);
508 }
509
510 static void set_region(int t, int b)
511 {
512 top = LIMIT(t - 1, 0, pad_rows() - 1);
513 bot = LIMIT(b ? b : pad_rows(), top + 1, pad_rows());
514 if (origin())
515 move_cursor(top, 0);
516 }
517
518 static void setattr(int m)
519 {
520 switch (m) {
521 case 0:
522 fg = FGCOLOR;
523 bg = BGCOLOR;
524 mode &= ~ATTR_ALL;
525 break;
526 case 1:
527 mode |= ATTR_BOLD;
528 break;
529 case 3:
530 mode |= ATTR_ITALIC;
531 break;
532 case 7:
533 mode |= ATTR_REV;
534 break;
535 case 22:
536 mode &= ~ATTR_BOLD;
537 break;
538 case 23:
539 mode &= ~ATTR_ITALIC;
540 break;
541 case 27:
542 mode &= ~ATTR_REV;
543 break;
544 default:
545 if ((m / 10) == 3)
546 fg = m > 37 ? FGCOLOR : m - 30;
547 if ((m / 10) == 4)
548 bg = m > 47 ? BGCOLOR : m - 40;
549 }
550 }
551
552 static void kill_chars(int sc, int ec)
553 {
554 int i;
555 for (i = sc; i < ec; i++)
556 draw_char(0, row, i);
557 draw_cursor(1);
558 }
559
560 static void move_chars(int sc, int nc, int n)
561 {
562 draw_cursor(0);
563 screen_move(OFFSET(row, sc + n), OFFSET(row, sc), nc);
564 if (n > 0)
565 screen_reset(OFFSET(row, sc), n);
566 else
567 screen_reset(OFFSET(row, pad_cols() + n), -n);
568 draw_cols(row, MIN(sc, sc + n), pad_cols());
569 draw_cursor(1);
570 }
571
572 static void delete_chars(int n)
573 {
574 int sc = col + n;
575 int nc = pad_cols() - sc;
576 move_chars(sc, nc, -n);
577 }
578
579 static void insert_chars(int n)
580 {
581 int nc = pad_cols() - col - n;
582 move_chars(col, nc, n);
583 }
584
585 static void advance(int dr, int dc, int scrl)
586 {
587 int r = row + dr;
588 int c = col + dc;
589 if (dr && r >= bot && scrl) {
590 int n = bot - r - 1;
591 int nr = (bot - top) + n;
592 scroll_screen(top + -n, nr, n);
593 }
594 if (dr && r < top && scrl) {
595 int n = top - r;
596 int nr = (bot - top) - n;
597 scroll_screen(top, nr, n);
598 }
599 r = dr ? LIMIT(r, top, bot - 1) : r;
600 c = LIMIT(c, 0, pad_cols() - 1);
601 move_cursor(r, c);
602 }
603
604 static void insertchar(int c)
605 {
606 if (mode & MODE_WRAPREADY)
607 advance(1, -col, 1);
608 if (mode & MODE_INSERT)
609 insert_chars(1);
610 draw_char(c, row, col);
611 if (col == pad_cols() - 1)
612 mode = BIT_SET(mode, MODE_WRAPREADY, 1);
613 else
614 advance(0, 1, 1);
615 }
616
617
618 /* partial vt102 implementation */
619
620 static void escseq(void);
621 static void escseq_cs(void);
622 static void escseq_g0(void);
623 static void escseq_g1(void);
624 static void escseq_g2(void);
625 static void escseq_g3(void);
626 static void csiseq(void);
627 static void csiseq_da(int c);
628 static void csiseq_dsr(int c);
629 static void modeseq(int c, int set);
630
631 /* comments taken from: http://www.ivarch.com/programs/termvt102.shtml */
632
633 static int readutf8(int c)
634 {
635 int result;
636 int l = 1;
637 if (~c & 0xc0)
638 return c;
639 while (l < 6 && c & (0x40 >> l))
640 l++;
641 result = (0x3f >> l) & c;
642 while (l--)
643 result = (result << 6) | (readpty() & 0x3f);
644 return result;
645 }
646
647 #define unknown(ctl, c)
648
649 /* control sequences */
650 static void ctlseq(void)
651 {
652 int c = readpty();
653 switch (c) {
654 case 0x09: /* HT horizontal tab to next tab stop */
655 advance(0, 8 - col % 8, 0);
656 break;
657 case 0x0a: /* LF line feed */
658 case 0x0b: /* VT line feed */
659 case 0x0c: /* FF line feed */
660 advance(1, (mode & MODE_AUTOCR) ? -col : 0, 1);
661 break;
662 case 0x08: /* BS backspace one column */
663 advance(0, -1, 0);
664 break;
665 case 0x1b: /* ESC start escape sequence */
666 escseq();
667 break;
668 case 0x0d: /* CR carriage return */
669 advance(0, -col, 0);
670 break;
671 case 0x00: /* NUL ignored */
672 case 0x07: /* BEL beep */
673 case 0x7f: /* DEL ignored */
674 break;
675 case 0x05: /* ENQ trigger answerback message */
676 case 0x0e: /* SO activate G1 character set & newline */
677 case 0x0f: /* SI activate G0 character set */
678 case 0x11: /* XON resume transmission */
679 case 0x13: /* XOFF stop transmission, ignore characters */
680 case 0x18: /* CAN interrupt escape sequence */
681 case 0x1a: /* SUB interrupt escape sequence */
682 case 0x9b: /* CSI equivalent to ESC [ */
683 unknown("ctlseq", c);
684 break;
685 default:
686 c = readutf8(c);
687 if (isdw(c) && col + 1 == pad_cols() && ~mode & MODE_WRAPREADY)
688 insertchar(0);
689 if (!iszw(c))
690 insertchar(c);
691 if (isdw(c))
692 insertchar(c | DWCHAR);
693 break;
694 }
695 }
696
697 #define ESCM(c) (((c) & 0xf0) == 0x20)
698 #define ESCF(c) ((c) > 0x30 && (c) < 0x7f)
699
700 /* escape sequences */
701 static void escseq(void)
702 {
703 int c = readpty();
704 while (ESCM(c))
705 c = readpty();
706 switch (c) {
707 case '[': /* CSI control sequence introducer */
708 csiseq();
709 break;
710 case '%': /* CS... escseq_cs table */
711 escseq_cs();
712 break;
713 case '(': /* G0... escseq_g0 table */
714 escseq_g0();
715 break;
716 case ')': /* G1... escseq_g1 table */
717 escseq_g1();
718 break;
719 case '*': /* G2... escseq_g2 table */
720 escseq_g2();
721 break;
722 case '+': /* G3... escseq_g3 table */
723 escseq_g3();
724 break;
725 case '7': /* DECSC save state (position, charset, attributes) */
726 misc_save(&term->sav);
727 break;
728 case '8': /* DECRC restore most recently saved state */
729 misc_load(&term->sav);
730 break;
731 case 'M': /* RI reverse line feed */
732 advance(-1, 0, 1);
733 break;
734 case 'D': /* IND line feed */
735 advance(1, 0, 1);
736 break;
737 case 'E': /* NEL newline */
738 advance(1, -col, 1);
739 break;
740 case 'c': /* RIS reset */
741 term_reset();
742 break;
743 case 'H': /* HTS set tab stop at current column */
744 case 'Z': /* DECID DEC private ID; return ESC [ ? 6 c (VT102) */
745 case '#': /* DECALN ("#8") DEC alignment test - fill screen with E's */
746 case '>': /* DECPNM set numeric keypad mode */
747 case '=': /* DECPAM set application keypad mode */
748 case 'N': /* SS2 select G2 charset for next char only */
749 case 'O': /* SS3 select G3 charset for next char only */
750 case 'P': /* DCS device control string (ended by ST) */
751 case 'X': /* SOS start of string */
752 case '^': /* PM privacy message (ended by ST) */
753 case '_': /* APC application program command (ended by ST) */
754 case '\\': /* ST string terminator */
755 case 'n': /* LS2 invoke G2 charset */
756 case 'o': /* LS3 invoke G3 charset */
757 case '|': /* LS3R invoke G3 charset as GR */
758 case '}': /* LS2R invoke G2 charset as GR */
759 case '~': /* LS1R invoke G1 charset as GR */
760 case ']': /* OSC operating system command */
761 case 'g': /* BEL alternate BEL */
762 default:
763 unknown("escseq", c);
764 break;
765 }
766 }
767
768 static void escseq_cs(void)
769 {
770 int c = readpty();
771 switch (c) {
772 case '@': /* CSDFL select default charset (ISO646/8859-1) */
773 case 'G': /* CSUTF8 select UTF-8 */
774 case '8': /* CSUTF8 select UTF-8 (obsolete) */
775 default:
776 unknown("escseq_cs", c);
777 break;
778 }
779 }
780
781 static void escseq_g0(void)
782 {
783 int c = readpty();
784 switch (c) {
785 case '8': /* G0DFL G0 charset = default mapping (ISO8859-1) */
786 case '0': /* G0GFX G0 charset = VT100 graphics mapping */
787 case 'U': /* G0ROM G0 charset = null mapping (straight to ROM) */
788 case 'K': /* G0USR G0 charset = user defined mapping */
789 case 'B': /* G0TXT G0 charset = ASCII mapping */
790 default:
791 unknown("escseq_g0", c);
792 break;
793 }
794 }
795
796 static void escseq_g1(void)
797 {
798 int c = readpty();
799 switch (c) {
800 case '8': /* G1DFL G1 charset = default mapping (ISO8859-1) */
801 case '0': /* G1GFX G1 charset = VT100 graphics mapping */
802 case 'U': /* G1ROM G1 charset = null mapping (straight to ROM) */
803 case 'K': /* G1USR G1 charset = user defined mapping */
804 case 'B': /* G1TXT G1 charset = ASCII mapping */
805 default:
806 unknown("escseq_g1", c);
807 break;
808 }
809 }
810
811 static void escseq_g2(void)
812 {
813 int c = readpty();
814 switch (c) {
815 case '8': /* G2DFL G2 charset = default mapping (ISO8859-1) */
816 case '0': /* G2GFX G2 charset = VT100 graphics mapping */
817 case 'U': /* G2ROM G2 charset = null mapping (straight to ROM) */
818 case 'K': /* G2USR G2 charset = user defined mapping */
819 default:
820 unknown("escseq_g2", c);
821 break;
822 }
823 }
824
825 static void escseq_g3(void)
826 {
827 int c = readpty();
828 switch (c) {
829 case '8': /* G3DFL G3 charset = default mapping (ISO8859-1) */
830 case '0': /* G3GFX G3 charset = VT100 graphics mapping */
831 case 'U': /* G3ROM G3 charset = null mapping (straight to ROM) */
832 case 'K': /* G3USR G3 charset = user defined mapping */
833 default:
834 unknown("escseq_g3", c);
835 break;
836 }
837 }
838
839 static int absrow(int r)
840 {
841 return origin() ? top + r : r;
842 }
843
844 #define CSIP(c) (((c) & 0xf0) == 0x30)
845 #define CSII(c) (((c) & 0xf0) == 0x20)
846 #define CSIF(c) ((c) >= 0x40 && (c) < 0x80)
847
848 #define MAXCSIARGS 32
849 /* ECMA-48 CSI sequences */
850 static void csiseq(void)
851 {
852 int args[MAXCSIARGS] = {0};
853 int i;
854 int n = 0;
855 int c = readpty();
856 int priv = 0;
857
858 if (strchr("<=>?", c)) {
859 priv = c;
860 c = readpty();
861 }
862 while (CSIP(c)) {
863 int arg = 0;
864 while (isdigit(c)) {
865 arg = arg * 10 + (c - '0');
866 c = readpty();
867 }
868 if (CSIP(c))
869 c = readpty();
870 if (n < MAXCSIARGS)
871 args[n++] = arg;
872 }
873 while (CSII(c))
874 c = readpty();
875 switch (c) {
876 case 'H': /* CUP move cursor to row, column */
877 case 'f': /* HVP move cursor to row, column */
878 move_cursor(absrow(MAX(0, args[0] - 1)), MAX(0, args[1] - 1));
879 break;
880 case 'J': /* ED erase display */
881 switch (args[0]) {
882 case 0:
883 kill_chars(col, pad_cols());
884 blank_rows(row + 1, pad_rows());
885 break;
886 case 1:
887 kill_chars(0, col + 1);
888 blank_rows(0, row - 1);
889 break;
890 case 2:
891 term_blank();
892 break;
893 }
894 break;
895 case 'A': /* CUU move cursor up */
896 advance(-MAX(1, args[0]), 0, 0);
897 break;
898 case 'e': /* VPR move cursor down */
899 case 'B': /* CUD move cursor down */
900 advance(MAX(1, args[0]), 0, 0);
901 break;
902 case 'a': /* HPR move cursor right */
903 case 'C': /* CUF move cursor right */
904 advance(0, MAX(1, args[0]), 0);
905 break;
906 case 'D': /* CUB move cursor left */
907 advance(0, -MAX(1, args[0]), 0);
908 break;
909 case 'K': /* EL erase line */
910 switch (args[0]) {
911 case 0:
912 kill_chars(col, pad_cols());
913 break;
914 case 1:
915 kill_chars(0, col + 1);
916 break;
917 case 2:
918 kill_chars(0, pad_cols());
919 break;
920 }
921 break;
922 case 'L': /* IL insert blank lines */
923 if (row >= top && row < bot)
924 insert_lines(MAX(1, args[0]));
925 break;
926 case 'M': /* DL delete lines */
927 if (row >= top && row < bot)
928 delete_lines(MAX(1, args[0]));
929 break;
930 case 'd': /* VPA move to row (current column) */
931 move_cursor(absrow(MAX(1, args[0]) - 1), col);
932 break;
933 case 'm': /* SGR set graphic rendition */
934 if (!n)
935 setattr(0);
936 for (i = 0; i < n; i++)
937 setattr(args[i]);
938 break;
939 case 'r': /* DECSTBM set scrolling region to (top, bottom) rows */
940 set_region(args[0], args[1]);
941 break;
942 case 'c': /* DA return ESC [ ? 6 c (VT102) */
943 csiseq_da(priv == '?' ? args[0] | 0x80 : args[0]);
944 break;
945 case 'h': /* SM set mode */
946 for (i = 0; i < n; i++)
947 modeseq(priv == '?' ? args[i] | 0x80 : args[i], 1);
948 break;
949 case 'l': /* RM reset mode */
950 for (i = 0; i < n; i++)
951 modeseq(priv == '?' ? args[i] | 0x80 : args[i], 0);
952 break;
953 case 'P': /* DCH delete characters on current line */
954 delete_chars(LIMIT(args[0], 1, pad_cols() - col));
955 break;
956 case '@': /* ICH insert blank characters */
957 insert_chars(LIMIT(args[0], 1, pad_cols() - col));
958 break;
959 case 'n': /* DSR device status report */
960 csiseq_dsr(args[0]);
961 break;
962 case 'G': /* CHA move cursor to column in current row */
963 advance(0, MAX(0, args[0] - 1) - col, 0);
964 break;
965 case 'X': /* ECH erase characters on current line */
966 kill_chars(col, MIN(col + MAX(1, args[0]), pad_cols()));
967 break;
968 case '[': /* IGN ignored control sequence */
969 case 'E': /* CNL move cursor down and to column 1 */
970 case 'F': /* CPL move cursor up and to column 1 */
971 case 'g': /* TBC clear tab stop (CSI 3 g = clear all stops) */
972 case 'q': /* DECLL set keyboard LEDs */
973 case 's': /* CUPSV save cursor position */
974 case 'u': /* CUPRS restore cursor position */
975 case '`': /* HPA move cursor to column in current row */
976 default:
977 unknown("csiseq", c);
978 break;
979 }
980 }
981
982 static void csiseq_da(int c)
983 {
984 switch (c) {
985 case 0x00:
986 term_sendstr("\x1b[?6c");
987 break;
988 default:
989 /* we don't care much about cursor shape */
990 /* printf("csiseq_da <0x%x>\n", c); */
991 break;
992 }
993 }
994
995 static void csiseq_dsr(int c)
996 {
997 char status[1 << 5];
998 switch (c) {
999 case 0x05:
1000 term_sendstr("\x1b[0n");
1001 break;
1002 case 0x06:
1003 sprintf(status, "\x1b[%d;%dR",
1004 (origin() ? row - top : row) + 1, col + 1);
1005 term_sendstr(status);
1006 break;
1007 default:
1008 unknown("csiseq_dsr", c);
1009 break;
1010 }
1011 }
1012
1013 /* ANSI/DEC specified modes for SM/RM ANSI Specified Modes */
1014 static void modeseq(int c, int set)
1015 {
1016 switch (c) {
1017 case 0x87: /* DECAWM Auto Wrap */
1018 mode = BIT_SET(mode, MODE_WRAP, set);
1019 break;
1020 case 0x99: /* DECTCEM Cursor on (set); Cursor off (reset) */
1021 mode = BIT_SET(mode, MODE_CURSOR, set);
1022 break;
1023 case 0x86: /* DECOM Sets relative coordinates (set); Sets absolute coordinates (reset) */
1024 mode = BIT_SET(mode, MODE_ORIGIN, set);
1025 break;
1026 case 0x14: /* LNM Line Feed / New Line Mode */
1027 mode = BIT_SET(mode, MODE_AUTOCR, set);
1028 break;
1029 case 0x04: /* IRM insertion/replacement mode (always reset) */
1030 mode = BIT_SET(mode, MODE_INSERT, set);
1031 break;
1032 case 0x00: /* IGN Error (Ignored) */
1033 case 0x01: /* GATM guarded-area transfer mode (ignored) */
1034 case 0x02: /* KAM keyboard action mode (always reset) */
1035 case 0x03: /* CRM control representation mode (always reset) */
1036 case 0x05: /* SRTM status-reporting transfer mode */
1037 case 0x06: /* ERM erasure mode (always set) */
1038 case 0x07: /* VEM vertical editing mode (ignored) */
1039 case 0x0a: /* HEM horizontal editing mode */
1040 case 0x0b: /* PUM positioning unit mode */
1041 case 0x0c: /* SRM send/receive mode (echo on/off) */
1042 case 0x0d: /* FEAM format effector action mode */
1043 case 0x0e: /* FETM format effector transfer mode */
1044 case 0x0f: /* MATM multiple area transfer mode */
1045 case 0x10: /* TTM transfer termination mode */
1046 case 0x11: /* SATM selected area transfer mode */
1047 case 0x12: /* TSM tabulation stop mode */
1048 case 0x13: /* EBM editing boundary mode */
1049 /* DEC Private Modes: "?NUM" -> (NUM | 0x80) */
1050 case 0x80: /* IGN Error (Ignored) */
1051 case 0x81: /* DECCKM Cursorkeys application (set); Cursorkeys normal (reset) */
1052 case 0x82: /* DECANM ANSI (set); VT52 (reset) */
1053 case 0x83: /* DECCOLM 132 columns (set); 80 columns (reset) */
1054 case 0x84: /* DECSCLM Jump scroll (set); Smooth scroll (reset) */
1055 case 0x85: /* DECSCNM Reverse screen (set); Normal screen (reset) */
1056 case 0x88: /* DECARM Auto Repeat */
1057 case 0x89: /* DECINLM Interlace */
1058 case 0x92: /* DECPFF Send FF to printer after print screen (set); No char after PS (reset) */
1059 case 0x93: /* DECPEX Print screen: prints full screen (set); prints scroll region (reset) */
1060 default:
1061 unknown("modeseq", c);
1062 break;
1063 }
1064 }
A small linux framebuffer virtual terminal