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term: stop showing the history after term_hist(0)
[fbpad.git] / term.c
blob12f512c19009eb60627acb603c0d64309d5fdf22
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 #define MAXLINES (1 << 8)
43 static int dirty[MAXLINES];
44 static int lazy;
45
46 static char fgcolor(void)
47 {
48 int c = mode & ATTR_REV ? bg : fg;
49 if (mode & ATTR_BOLD)
50 c |= FN_B;
51 if (mode & ATTR_ITALIC)
52 c |= FN_I;
53 return c;
54 }
55
56 static char bgcolor(void)
57 {
58 return mode & ATTR_REV ? fg : bg;
59 }
60
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 if (visible)
68 pad_put(screen[i], r, c, fg, bg);
69 }
70
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 (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)
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 PTYBUFSIZE (1 << 13)
161
162 static char ptybuf[PTYBUFSIZE]; /* always emptied in term_read() */
163 static int ptylen; /* buffer length */
164 static int ptycur; /* current offset */
165
166 static void waitpty(void)
167 {
168 struct pollfd ufds[1];
169 ufds[0].fd = term->fd;
170 ufds[0].events = POLLIN;
171 poll(ufds, 1, 100);
172 }
173
174 static int readpty(void)
175 {
176 if (ptycur < ptylen)
177 return (unsigned char) ptybuf[ptycur++];
178 if (!term->fd)
179 return -1;
180 ptylen = read(term->fd, ptybuf, PTYBUFSIZE);
181 if (ptylen == -1 && errno == EAGAIN) {
182 waitpty();
183 ptylen = read(term->fd, ptybuf, PTYBUFSIZE);
184 }
185 if (ptylen > 0) {
186 ptycur = 1;
187 return (unsigned char) ptybuf[0];
188 }
189 return -1;
190 }
191
192 /* term interface functions */
193
194 void term_send(int c)
195 {
196 char b = c;
197 if (term->fd)
198 write(term->fd, &b, 1);
199 }
200
201 static void term_sendstr(char *s)
202 {
203 if (term->fd)
204 write(term->fd, s, strlen(s));
205 }
206
207 static void term_blank(void)
208 {
209 screen_reset(0, pad_rows() * pad_cols());
210 if (visible)
211 pad_blank(bgcolor());
212 }
213
214 static void ctlseq(void);
215 void term_read(void)
216 {
217 ctlseq();
218 while (ptycur < ptylen) {
219 if (!lazy && ptylen - ptycur > 15)
220 lazy_start();
221 ctlseq();
222 }
223 if (lazy)
224 lazy_flush();
225 }
226
227 static void term_reset(void)
228 {
229 row = col = 0;
230 top = 0;
231 bot = pad_rows();
232 mode = MODE_DEFAULT;
233 fg = FGCOLOR;
234 bg = BGCOLOR;
235 term_blank();
236 }
237
238 static int _openpty(int *master, int *slave)
239 {
240 int unlock = 0;
241 int ptyno = 0;
242 char name[20];
243 if ((*master = open("/dev/ptmx", O_RDWR)) == -1)
244 return -1;
245 if (ioctl(*master, TIOCSPTLCK, &unlock) == -1)
246 return -1;
247 if (ioctl(*master, TIOCGPTN, &ptyno) == -1)
248 return -1;
249 sprintf(name, "/dev/pts/%d", ptyno);
250 *slave = open(name, O_RDWR | O_NOCTTY);
251 return 0;
252 }
253
254 static void _login(int fd)
255 {
256 struct winsize winp;
257 winp.ws_col = pad_cols();
258 winp.ws_row = pad_rows();
259 winp.ws_xpixel = 0;
260 winp.ws_ypixel = 0;
261 setsid();
262 ioctl(fd, TIOCSCTTY, NULL);
263 ioctl(fd, TIOCSWINSZ, &winp);
264 dup2(fd, 0);
265 dup2(fd, 1);
266 dup2(fd, 2);
267 if (fd > 2)
268 close(fd);
269 }
270
271 #define MAXENV (1 << 8)
272
273 static void envcpy(char **d, char **s)
274 {
275 while (*s)
276 *d++ = *s++;
277 *d = NULL;
278 }
279
280 static void execvep(char *cmd, char **argv, char **envp)
281 {
282 char path[512];
283 char *p = getenv("PATH");
284 execve(cmd, argv, envp);
285 while (*p) {
286 char *s = path;
287 while (*p && *p != ':')
288 *s++ = *p++;
289 *s++ = '/';
290 strcpy(s, cmd);
291 execve(path, argv, envp);
292 while (*p == ':')
293 p++;
294 }
295 }
296
297 extern char **environ;
298 void term_exec(char **args)
299 {
300 int master, slave;
301 memset(term, 0, sizeof(*term));
302 if (_openpty(&master, &slave) == -1)
303 return;
304 if ((term->pid = fork()) == -1)
305 return;
306 if (!term->pid) {
307 char *envp[MAXENV] = {"TERM=linux"};
308 envcpy(envp + 1, environ);
309 _login(slave);
310 close(master);
311 execvep(args[0], args, envp);
312 exit(1);
313 }
314 close(slave);
315 term->fd = master;
316 fcntl(term->fd, F_SETFD, fcntl(term->fd, F_GETFD) | FD_CLOEXEC);
317 fcntl(term->fd, F_SETFL, fcntl(term->fd, F_GETFL) | O_NONBLOCK);
318 term_reset();
319 memset(term->hist, 0, sizeof(term->hist));
320 }
321
322 static void misc_save(struct term_state *state)
323 {
324 state->row = row;
325 state->col = col;
326 state->fg = fg;
327 state->bg = bg;
328 state->mode = mode;
329 }
330
331 static void misc_load(struct term_state *state)
332 {
333 row = state->row;
334 col = state->col;
335 fg = state->fg;
336 bg = state->bg;
337 mode = state->mode;
338 }
339
340 void term_save(struct term *term)
341 {
342 visible = 0;
343 misc_save(&term->cur);
344 term->top = top;
345 term->bot = bot;
346 }
347
348 static void term_redraw(void)
349 {
350 int i;
351 for (i = 0; i < pad_rows(); i++)
352 _draw_row(i);
353 _draw_pos(row, col, 1);
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 if (flags == TERM_REDRAW) {
367 if (term->fd)
368 term_redraw();
369 else
370 pad_blank(0);
371 }
372 }
373
374 void term_end(void)
375 {
376 if (term->fd)
377 close(term->fd);
378 memset(term, 0, sizeof(*term));
379 term_load(term, visible ? TERM_REDRAW : TERM_HIDDEN);
380 }
381
382 static int writeutf8(char *dst, int c)
383 {
384 char *d = dst;
385 int l;
386 if (c > 0xffff) {
387 *d++ = 0xf0 | (c >> 18);
388 l = 3;
389 } else if (c > 0x7ff) {
390 *d++ = 0xe0 | (c >> 12);
391 l = 2;
392 } else if (c > 0x7f) {
393 *d++ = 0xc0 | (c >> 6);
394 l = 1;
395 } else {
396 *d++ = c > 0 ? c : ' ';
397 l = 0;
398 }
399 while (l--)
400 *d++ = 0x80 | ((c >> (l * 6)) & 0x3f);
401 return d - dst;
402 }
403
404 void term_screenshot(void)
405 {
406 char buf[1 << 11];
407 int fd = open(SCRSHOT, O_CREAT | O_TRUNC | O_WRONLY, 0600);
408 int i, j;
409 for (i = 0; i < pad_rows(); i++) {
410 char *s = buf;
411 for (j = 0; j < pad_cols(); j++)
412 if (~screen[OFFSET(i, j)] & DWCHAR)
413 s += writeutf8(s, screen[OFFSET(i, j)]);
414 *s++ = '\n';
415 write(fd, buf, s - buf);
416 }
417 close(fd);
418 }
419
420 /* high-level drawing functions */
421
422 static void empty_rows(int sr, int er)
423 {
424 screen_reset(OFFSET(sr, 0), (er - sr) * pad_cols());
425 }
426
427 static void blank_rows(int sr, int er)
428 {
429 empty_rows(sr, er);
430 draw_rows(sr, er);
431 draw_cursor(1);
432 }
433
434 #define HISTROW(pos) (term->hist + ((term->histtail + NHIST - (pos)) % NHIST) * pad_cols())
435
436 static void scrl_rows(int nr)
437 {
438 int i;
439 for (i = 0; i < nr; i++) {
440 memcpy(HISTROW(0), screen + i * pad_cols(),
441 pad_cols() * sizeof(screen[0]));
442 term->histtail = (term->histtail + 1) % NHIST;
443 }
444 }
445
446 void term_hist(int scrl)
447 {
448 int i, j;
449 int *_scr;
450 char *_fgs, *_bgs;
451 if (!scrl) {
452 lazy_flush();
453 return;
454 }
455 lazy_start();
456 memset(dirty, 1, sizeof(dirty));
457 for (i = 0; i < pad_rows(); i++) {
458 if (i < scrl) {
459 _scr = HISTROW(scrl - i);
460 _fgs = NULL;
461 _bgs = NULL;
462 } else {
463 int off = (i - scrl) * pad_cols();
464 _scr = term->screen + off;
465 _fgs = term->fgs + off;
466 _bgs = term->bgs + off;
467 }
468 for (j = 0; j < pad_cols(); j++)
469 pad_put(_scr[j], i, j, _fgs ? _fgs[j] : BGCOLOR,
470 _bgs ? _bgs[j] : FGCOLOR);
471 }
472 }
473
474 static void scroll_screen(int sr, int nr, int n)
475 {
476 draw_cursor(0);
477 if (sr + n == 0)
478 scrl_rows(sr);
479 screen_move(OFFSET(sr + n, 0), OFFSET(sr, 0), nr * pad_cols());
480 if (n > 0)
481 empty_rows(sr, sr + n);
482 else
483 empty_rows(sr + nr + n, sr + nr);
484 draw_rows(MIN(sr, sr + n), MAX(sr + nr, sr + nr + n));
485 draw_cursor(1);
486 }
487
488 static void insert_lines(int n)
489 {
490 int sr = MAX(top, row);
491 int nr = bot - row - n;
492 if (nr > 0)
493 scroll_screen(sr, nr, n);
494 }
495
496 static void delete_lines(int n)
497 {
498 int r = MAX(top, row);
499 int sr = r + n;
500 int nr = bot - r - n;
501 if (nr > 0)
502 scroll_screen(sr, nr, -n);
503 }
504
505 static int origin(void)
506 {
507 return mode & MODE_ORIGIN;
508 }
509
510 static void move_cursor(int r, int c)
511 {
512 int t, b;
513 draw_cursor(0);
514 t = origin() ? top : 0;
515 b = origin() ? bot : pad_rows();
516 row = LIMIT(r, t, b - 1);
517 col = LIMIT(c, 0, pad_cols() - 1);
518 draw_cursor(1);
519 mode = BIT_SET(mode, MODE_WRAPREADY, 0);
520 }
521
522 static void set_region(int t, int b)
523 {
524 top = LIMIT(t - 1, 0, pad_rows() - 1);
525 bot = LIMIT(b ? b : pad_rows(), top + 1, pad_rows());
526 if (origin())
527 move_cursor(top, 0);
528 }
529
530 static void setattr(int m)
531 {
532 switch (m) {
533 case 0:
534 fg = FGCOLOR;
535 bg = BGCOLOR;
536 mode &= ~ATTR_ALL;
537 break;
538 case 1:
539 mode |= ATTR_BOLD;
540 break;
541 case 3:
542 mode |= ATTR_ITALIC;
543 break;
544 case 7:
545 mode |= ATTR_REV;
546 break;
547 case 22:
548 mode &= ~ATTR_BOLD;
549 break;
550 case 23:
551 mode &= ~ATTR_ITALIC;
552 break;
553 case 27:
554 mode &= ~ATTR_REV;
555 break;
556 default:
557 if ((m / 10) == 3)
558 fg = m > 37 ? FGCOLOR : m - 30;
559 if ((m / 10) == 4)
560 bg = m > 47 ? BGCOLOR : m - 40;
561 }
562 }
563
564 static void kill_chars(int sc, int ec)
565 {
566 int i;
567 for (i = sc; i < ec; i++)
568 draw_char(0, row, i);
569 draw_cursor(1);
570 }
571
572 static void move_chars(int sc, int nc, int n)
573 {
574 draw_cursor(0);
575 screen_move(OFFSET(row, sc + n), OFFSET(row, sc), nc);
576 if (n > 0)
577 screen_reset(OFFSET(row, sc), n);
578 else
579 screen_reset(OFFSET(row, pad_cols() + n), -n);
580 draw_cols(row, MIN(sc, sc + n), pad_cols());
581 draw_cursor(1);
582 }
583
584 static void delete_chars(int n)
585 {
586 int sc = col + n;
587 int nc = pad_cols() - sc;
588 move_chars(sc, nc, -n);
589 }
590
591 static void insert_chars(int n)
592 {
593 int nc = pad_cols() - col - n;
594 move_chars(col, nc, n);
595 }
596
597 static void advance(int dr, int dc, int scrl)
598 {
599 int r = row + dr;
600 int c = col + dc;
601 if (dr && r >= bot && scrl) {
602 int n = bot - r - 1;
603 int nr = (bot - top) + n;
604 scroll_screen(top + -n, nr, n);
605 }
606 if (dr && r < top && scrl) {
607 int n = top - r;
608 int nr = (bot - top) - n;
609 scroll_screen(top, nr, n);
610 }
611 r = dr ? LIMIT(r, top, bot - 1) : r;
612 c = LIMIT(c, 0, pad_cols() - 1);
613 move_cursor(r, c);
614 }
615
616 static void insertchar(int c)
617 {
618 if (mode & MODE_WRAPREADY)
619 advance(1, -col, 1);
620 if (mode & MODE_INSERT)
621 insert_chars(1);
622 draw_char(c, row, col);
623 if (col == pad_cols() - 1)
624 mode = BIT_SET(mode, MODE_WRAPREADY, 1);
625 else
626 advance(0, 1, 1);
627 }
628
629
630 /* partial vt102 implementation */
631
632 static void escseq(void);
633 static void escseq_cs(void);
634 static void escseq_g0(void);
635 static void escseq_g1(void);
636 static void escseq_g2(void);
637 static void escseq_g3(void);
638 static void csiseq(void);
639 static void csiseq_da(int c);
640 static void csiseq_dsr(int c);
641 static void modeseq(int c, int set);
642
643 /* comments taken from: http://www.ivarch.com/programs/termvt102.shtml */
644
645 static int readutf8(int c)
646 {
647 int result;
648 int l = 1;
649 if (~c & 0xc0)
650 return c;
651 while (l < 6 && c & (0x40 >> l))
652 l++;
653 result = (0x3f >> l) & c;
654 while (l--)
655 result = (result << 6) | (readpty() & 0x3f);
656 return result;
657 }
658
659 #define unknown(ctl, c)
660
661 /* control sequences */
662 static void ctlseq(void)
663 {
664 int c = readpty();
665 switch (c) {
666 case 0x09: /* HT horizontal tab to next tab stop */
667 advance(0, 8 - col % 8, 0);
668 break;
669 case 0x0a: /* LF line feed */
670 case 0x0b: /* VT line feed */
671 case 0x0c: /* FF line feed */
672 advance(1, (mode & MODE_AUTOCR) ? -col : 0, 1);
673 break;
674 case 0x08: /* BS backspace one column */
675 advance(0, -1, 0);
676 break;
677 case 0x1b: /* ESC start escape sequence */
678 escseq();
679 break;
680 case 0x0d: /* CR carriage return */
681 advance(0, -col, 0);
682 break;
683 case 0x00: /* NUL ignored */
684 case 0x07: /* BEL beep */
685 case 0x7f: /* DEL ignored */
686 break;
687 case 0x05: /* ENQ trigger answerback message */
688 case 0x0e: /* SO activate G1 character set & newline */
689 case 0x0f: /* SI activate G0 character set */
690 case 0x11: /* XON resume transmission */
691 case 0x13: /* XOFF stop transmission, ignore characters */
692 case 0x18: /* CAN interrupt escape sequence */
693 case 0x1a: /* SUB interrupt escape sequence */
694 case 0x9b: /* CSI equivalent to ESC [ */
695 unknown("ctlseq", c);
696 break;
697 default:
698 c = readutf8(c);
699 if (isdw(c) && col + 1 == pad_cols() && ~mode & MODE_WRAPREADY)
700 insertchar(0);
701 if (!iszw(c))
702 insertchar(c);
703 if (isdw(c))
704 insertchar(c | DWCHAR);
705 break;
706 }
707 }
708
709 #define ESCM(c) (((c) & 0xf0) == 0x20)
710 #define ESCF(c) ((c) > 0x30 && (c) < 0x7f)
711
712 /* escape sequences */
713 static void escseq(void)
714 {
715 int c = readpty();
716 while (ESCM(c))
717 c = readpty();
718 switch (c) {
719 case '[': /* CSI control sequence introducer */
720 csiseq();
721 break;
722 case '%': /* CS... escseq_cs table */
723 escseq_cs();
724 break;
725 case '(': /* G0... escseq_g0 table */
726 escseq_g0();
727 break;
728 case ')': /* G1... escseq_g1 table */
729 escseq_g1();
730 break;
731 case '*': /* G2... escseq_g2 table */
732 escseq_g2();
733 break;
734 case '+': /* G3... escseq_g3 table */
735 escseq_g3();
736 break;
737 case '7': /* DECSC save state (position, charset, attributes) */
738 misc_save(&term->sav);
739 break;
740 case '8': /* DECRC restore most recently saved state */
741 misc_load(&term->sav);
742 break;
743 case 'M': /* RI reverse line feed */
744 advance(-1, 0, 1);
745 break;
746 case 'D': /* IND line feed */
747 advance(1, 0, 1);
748 break;
749 case 'E': /* NEL newline */
750 advance(1, -col, 1);
751 break;
752 case 'c': /* RIS reset */
753 term_reset();
754 break;
755 case 'H': /* HTS set tab stop at current column */
756 case 'Z': /* DECID DEC private ID; return ESC [ ? 6 c (VT102) */
757 case '#': /* DECALN ("#8") DEC alignment test - fill screen with E's */
758 case '>': /* DECPNM set numeric keypad mode */
759 case '=': /* DECPAM set application keypad mode */
760 case 'N': /* SS2 select G2 charset for next char only */
761 case 'O': /* SS3 select G3 charset for next char only */
762 case 'P': /* DCS device control string (ended by ST) */
763 case 'X': /* SOS start of string */
764 case '^': /* PM privacy message (ended by ST) */
765 case '_': /* APC application program command (ended by ST) */
766 case '\\': /* ST string terminator */
767 case 'n': /* LS2 invoke G2 charset */
768 case 'o': /* LS3 invoke G3 charset */
769 case '|': /* LS3R invoke G3 charset as GR */
770 case '}': /* LS2R invoke G2 charset as GR */
771 case '~': /* LS1R invoke G1 charset as GR */
772 case ']': /* OSC operating system command */
773 case 'g': /* BEL alternate BEL */
774 default:
775 unknown("escseq", c);
776 break;
777 }
778 }
779
780 static void escseq_cs(void)
781 {
782 int c = readpty();
783 switch (c) {
784 case '@': /* CSDFL select default charset (ISO646/8859-1) */
785 case 'G': /* CSUTF8 select UTF-8 */
786 case '8': /* CSUTF8 select UTF-8 (obsolete) */
787 default:
788 unknown("escseq_cs", c);
789 break;
790 }
791 }
792
793 static void escseq_g0(void)
794 {
795 int c = readpty();
796 switch (c) {
797 case '8': /* G0DFL G0 charset = default mapping (ISO8859-1) */
798 case '0': /* G0GFX G0 charset = VT100 graphics mapping */
799 case 'U': /* G0ROM G0 charset = null mapping (straight to ROM) */
800 case 'K': /* G0USR G0 charset = user defined mapping */
801 case 'B': /* G0TXT G0 charset = ASCII mapping */
802 default:
803 unknown("escseq_g0", c);
804 break;
805 }
806 }
807
808 static void escseq_g1(void)
809 {
810 int c = readpty();
811 switch (c) {
812 case '8': /* G1DFL G1 charset = default mapping (ISO8859-1) */
813 case '0': /* G1GFX G1 charset = VT100 graphics mapping */
814 case 'U': /* G1ROM G1 charset = null mapping (straight to ROM) */
815 case 'K': /* G1USR G1 charset = user defined mapping */
816 case 'B': /* G1TXT G1 charset = ASCII mapping */
817 default:
818 unknown("escseq_g1", c);
819 break;
820 }
821 }
822
823 static void escseq_g2(void)
824 {
825 int c = readpty();
826 switch (c) {
827 case '8': /* G2DFL G2 charset = default mapping (ISO8859-1) */
828 case '0': /* G2GFX G2 charset = VT100 graphics mapping */
829 case 'U': /* G2ROM G2 charset = null mapping (straight to ROM) */
830 case 'K': /* G2USR G2 charset = user defined mapping */
831 default:
832 unknown("escseq_g2", c);
833 break;
834 }
835 }
836
837 static void escseq_g3(void)
838 {
839 int c = readpty();
840 switch (c) {
841 case '8': /* G3DFL G3 charset = default mapping (ISO8859-1) */
842 case '0': /* G3GFX G3 charset = VT100 graphics mapping */
843 case 'U': /* G3ROM G3 charset = null mapping (straight to ROM) */
844 case 'K': /* G3USR G3 charset = user defined mapping */
845 default:
846 unknown("escseq_g3", c);
847 break;
848 }
849 }
850
851 static int absrow(int r)
852 {
853 return origin() ? top + r : r;
854 }
855
856 #define CSIP(c) (((c) & 0xf0) == 0x30)
857 #define CSII(c) (((c) & 0xf0) == 0x20)
858 #define CSIF(c) ((c) >= 0x40 && (c) < 0x80)
859
860 #define MAXCSIARGS 32
861 /* ECMA-48 CSI sequences */
862 static void csiseq(void)
863 {
864 int args[MAXCSIARGS] = {0};
865 int i;
866 int n = 0;
867 int c = readpty();
868 int priv = 0;
869
870 if (strchr("<=>?", c)) {
871 priv = c;
872 c = readpty();
873 }
874 while (CSIP(c)) {
875 int arg = 0;
876 while (isdigit(c)) {
877 arg = arg * 10 + (c - '0');
878 c = readpty();
879 }
880 if (CSIP(c))
881 c = readpty();
882 if (n < MAXCSIARGS)
883 args[n++] = arg;
884 }
885 while (CSII(c))
886 c = readpty();
887 switch (c) {
888 case 'H': /* CUP move cursor to row, column */
889 case 'f': /* HVP move cursor to row, column */
890 move_cursor(absrow(MAX(0, args[0] - 1)), MAX(0, args[1] - 1));
891 break;
892 case 'J': /* ED erase display */
893 switch (args[0]) {
894 case 0:
895 kill_chars(col, pad_cols());
896 blank_rows(row + 1, pad_rows());
897 break;
898 case 1:
899 kill_chars(0, col + 1);
900 blank_rows(0, row - 1);
901 break;
902 case 2:
903 term_blank();
904 break;
905 }
906 break;
907 case 'A': /* CUU move cursor up */
908 advance(-MAX(1, args[0]), 0, 0);
909 break;
910 case 'e': /* VPR move cursor down */
911 case 'B': /* CUD move cursor down */
912 advance(MAX(1, args[0]), 0, 0);
913 break;
914 case 'a': /* HPR move cursor right */
915 case 'C': /* CUF move cursor right */
916 advance(0, MAX(1, args[0]), 0);
917 break;
918 case 'D': /* CUB move cursor left */
919 advance(0, -MAX(1, args[0]), 0);
920 break;
921 case 'K': /* EL erase line */
922 switch (args[0]) {
923 case 0:
924 kill_chars(col, pad_cols());
925 break;
926 case 1:
927 kill_chars(0, col + 1);
928 break;
929 case 2:
930 kill_chars(0, pad_cols());
931 break;
932 }
933 break;
934 case 'L': /* IL insert blank lines */
935 if (row >= top && row < bot)
936 insert_lines(MAX(1, args[0]));
937 break;
938 case 'M': /* DL delete lines */
939 if (row >= top && row < bot)
940 delete_lines(MAX(1, args[0]));
941 break;
942 case 'd': /* VPA move to row (current column) */
943 move_cursor(absrow(MAX(1, args[0]) - 1), col);
944 break;
945 case 'm': /* SGR set graphic rendition */
946 if (!n)
947 setattr(0);
948 for (i = 0; i < n; i++)
949 setattr(args[i]);
950 break;
951 case 'r': /* DECSTBM set scrolling region to (top, bottom) rows */
952 set_region(args[0], args[1]);
953 break;
954 case 'c': /* DA return ESC [ ? 6 c (VT102) */
955 csiseq_da(priv == '?' ? args[0] | 0x80 : args[0]);
956 break;
957 case 'h': /* SM set mode */
958 for (i = 0; i < n; i++)
959 modeseq(priv == '?' ? args[i] | 0x80 : args[i], 1);
960 break;
961 case 'l': /* RM reset mode */
962 for (i = 0; i < n; i++)
963 modeseq(priv == '?' ? args[i] | 0x80 : args[i], 0);
964 break;
965 case 'P': /* DCH delete characters on current line */
966 delete_chars(LIMIT(args[0], 1, pad_cols() - col));
967 break;
968 case '@': /* ICH insert blank characters */
969 insert_chars(LIMIT(args[0], 1, pad_cols() - col));
970 break;
971 case 'n': /* DSR device status report */
972 csiseq_dsr(args[0]);
973 break;
974 case 'G': /* CHA move cursor to column in current row */
975 advance(0, MAX(0, args[0] - 1) - col, 0);
976 break;
977 case 'X': /* ECH erase characters on current line */
978 kill_chars(col, MIN(col + MAX(1, args[0]), pad_cols()));
979 break;
980 case '[': /* IGN ignored control sequence */
981 case 'E': /* CNL move cursor down and to column 1 */
982 case 'F': /* CPL move cursor up and to column 1 */
983 case 'g': /* TBC clear tab stop (CSI 3 g = clear all stops) */
984 case 'q': /* DECLL set keyboard LEDs */
985 case 's': /* CUPSV save cursor position */
986 case 'u': /* CUPRS restore cursor position */
987 case '`': /* HPA move cursor to column in current row */
988 default:
989 unknown("csiseq", c);
990 break;
991 }
992 }
993
994 static void csiseq_da(int c)
995 {
996 switch (c) {
997 case 0x00:
998 term_sendstr("\x1b[?6c");
999 break;
1000 default:
1001 /* we don't care much about cursor shape */
1002 /* printf("csiseq_da <0x%x>\n", c); */
1003 break;
1004 }
1005 }
1006
1007 static void csiseq_dsr(int c)
1008 {
1009 char status[1 << 5];
1010 switch (c) {
1011 case 0x05:
1012 term_sendstr("\x1b[0n");
1013 break;
1014 case 0x06:
1015 sprintf(status, "\x1b[%d;%dR",
1016 (origin() ? row - top : row) + 1, col + 1);
1017 term_sendstr(status);
1018 break;
1019 default:
1020 unknown("csiseq_dsr", c);
1021 break;
1022 }
1023 }
1024
1025 /* ANSI/DEC specified modes for SM/RM ANSI Specified Modes */
1026 static void modeseq(int c, int set)
1027 {
1028 switch (c) {
1029 case 0x87: /* DECAWM Auto Wrap */
1030 mode = BIT_SET(mode, MODE_WRAP, set);
1031 break;
1032 case 0x99: /* DECTCEM Cursor on (set); Cursor off (reset) */
1033 mode = BIT_SET(mode, MODE_CURSOR, set);
1034 break;
1035 case 0x86: /* DECOM Sets relative coordinates (set); Sets absolute coordinates (reset) */
1036 mode = BIT_SET(mode, MODE_ORIGIN, set);
1037 break;
1038 case 0x14: /* LNM Line Feed / New Line Mode */
1039 mode = BIT_SET(mode, MODE_AUTOCR, set);
1040 break;
1041 case 0x04: /* IRM insertion/replacement mode (always reset) */
1042 mode = BIT_SET(mode, MODE_INSERT, set);
1043 break;
1044 case 0x00: /* IGN Error (Ignored) */
1045 case 0x01: /* GATM guarded-area transfer mode (ignored) */
1046 case 0x02: /* KAM keyboard action mode (always reset) */
1047 case 0x03: /* CRM control representation mode (always reset) */
1048 case 0x05: /* SRTM status-reporting transfer mode */
1049 case 0x06: /* ERM erasure mode (always set) */
1050 case 0x07: /* VEM vertical editing mode (ignored) */
1051 case 0x0a: /* HEM horizontal editing mode */
1052 case 0x0b: /* PUM positioning unit mode */
1053 case 0x0c: /* SRM send/receive mode (echo on/off) */
1054 case 0x0d: /* FEAM format effector action mode */
1055 case 0x0e: /* FETM format effector transfer mode */
1056 case 0x0f: /* MATM multiple area transfer mode */
1057 case 0x10: /* TTM transfer termination mode */
1058 case 0x11: /* SATM selected area transfer mode */
1059 case 0x12: /* TSM tabulation stop mode */
1060 case 0x13: /* EBM editing boundary mode */
1061 /* DEC Private Modes: "?NUM" -> (NUM | 0x80) */
1062 case 0x80: /* IGN Error (Ignored) */
1063 case 0x81: /* DECCKM Cursorkeys application (set); Cursorkeys normal (reset) */
1064 case 0x82: /* DECANM ANSI (set); VT52 (reset) */
1065 case 0x83: /* DECCOLM 132 columns (set); 80 columns (reset) */
1066 case 0x84: /* DECSCLM Jump scroll (set); Smooth scroll (reset) */
1067 case 0x85: /* DECSCNM Reverse screen (set); Normal screen (reset) */
1068 case 0x88: /* DECARM Auto Repeat */
1069 case 0x89: /* DECINLM Interlace */
1070 case 0x92: /* DECPFF Send FF to printer after print screen (set); No char after PS (reset) */
1071 case 0x93: /* DECPEX Print screen: prints full screen (set); prints scroll region (reset) */
1072 default:
1073 unknown("modeseq", c);
1074 break;
1075 }
1076 }
A small linux framebuffer virtual terminal