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fbpad: do not use STD*_FILENO macros for standard unix fds
[fbpad.git] / term.c
blobc87f98a23317b60894859596d5220b6272590720
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 }
142
143 static void screen_reset(int i, int n)
144 {
145 memset(screen + i, 0, n * sizeof(*screen));
146 memset(fgs + i, fg, n);
147 memset(bgs + i, bg, n);
148 }
149
150 static void screen_move(int dst, int src, int n)
151 {
152 memmove(screen + dst, screen + src, n * sizeof(*screen));
153 memmove(fgs + dst, fgs + src, n);
154 memmove(bgs + dst, bgs + src, n);
155 }
156
157 /* terminal input buffering */
158
159 #define PTYBUFSIZE (1 << 13)
160
161 static char ptybuf[PTYBUFSIZE]; /* always emptied in term_read() */
162 static int ptylen; /* buffer length */
163 static int ptycur; /* current offset */
164
165 static void waitpty(void)
166 {
167 struct pollfd ufds[1];
168 ufds[0].fd = term->fd;
169 ufds[0].events = POLLIN;
170 poll(ufds, 1, 100);
171 }
172
173 static int readpty(void)
174 {
175 if (ptycur < ptylen)
176 return (unsigned char) ptybuf[ptycur++];
177 if (!term->fd)
178 return -1;
179 ptylen = read(term->fd, ptybuf, PTYBUFSIZE);
180 if (ptylen == -1 && errno == EAGAIN) {
181 waitpty();
182 ptylen = read(term->fd, ptybuf, PTYBUFSIZE);
183 }
184 if (ptylen > 0) {
185 ptycur = 1;
186 return (unsigned char) ptybuf[0];
187 }
188 return -1;
189 }
190
191 /* term interface functions */
192
193 void term_send(int c)
194 {
195 char b = c;
196 if (term->fd)
197 write(term->fd, &b, 1);
198 }
199
200 static void term_sendstr(char *s)
201 {
202 if (term->fd)
203 write(term->fd, s, strlen(s));
204 }
205
206 static void term_blank(void)
207 {
208 screen_reset(0, pad_rows() * pad_cols());
209 if (visible)
210 pad_blank(bgcolor());
211 }
212
213 static void ctlseq(void);
214 void term_read(void)
215 {
216 ctlseq();
217 while (ptycur < ptylen) {
218 if (!lazy && ptylen - ptycur > 15)
219 lazy_start();
220 ctlseq();
221 }
222 if (lazy)
223 lazy_flush();
224 lazy = 0;
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 *cmd)
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 char *argv[2] = {cmd};
309 envcpy(envp + 1, environ);
310 _login(slave);
311 close(master);
312 execvep(cmd, argv, envp);
313 exit(1);
314 }
315 close(slave);
316 term->fd = master;
317 fcntl(term->fd, F_SETFD, fcntl(term->fd, F_GETFD) | FD_CLOEXEC);
318 fcntl(term->fd, F_SETFL, fcntl(term->fd, F_GETFL) | O_NONBLOCK);
319 term_reset();
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 static void scroll_screen(int sr, int nr, int n)
435 {
436 draw_cursor(0);
437 screen_move(OFFSET(sr + n, 0), OFFSET(sr, 0), nr * pad_cols());
438 if (n > 0)
439 empty_rows(sr, sr + n);
440 else
441 empty_rows(sr + nr + n, sr + nr);
442 draw_rows(MIN(sr, sr + n), MAX(sr + nr, sr + nr + n));
443 draw_cursor(1);
444 }
445
446 static void insert_lines(int n)
447 {
448 int sr = MAX(top, row);
449 int nr = bot - row - n;
450 if (nr > 0)
451 scroll_screen(sr, nr, n);
452 }
453
454 static void delete_lines(int n)
455 {
456 int r = MAX(top, row);
457 int sr = r + n;
458 int nr = bot - r - n;
459 if (nr > 0)
460 scroll_screen(sr, nr, -n);
461 }
462
463 static int origin(void)
464 {
465 return mode & MODE_ORIGIN;
466 }
467
468 static void move_cursor(int r, int c)
469 {
470 int t, b;
471 draw_cursor(0);
472 t = origin() ? top : 0;
473 b = origin() ? bot : pad_rows();
474 row = LIMIT(r, t, b - 1);
475 col = LIMIT(c, 0, pad_cols() - 1);
476 draw_cursor(1);
477 mode = BIT_SET(mode, MODE_WRAPREADY, 0);
478 }
479
480 static void set_region(int t, int b)
481 {
482 top = LIMIT(t - 1, 0, pad_rows() - 1);
483 bot = LIMIT(b ? b : pad_rows(), top + 1, pad_rows());
484 if (origin())
485 move_cursor(top, 0);
486 }
487
488 static void setattr(int m)
489 {
490 switch (m) {
491 case 0:
492 fg = FGCOLOR;
493 bg = BGCOLOR;
494 mode &= ~ATTR_ALL;
495 break;
496 case 1:
497 mode |= ATTR_BOLD;
498 break;
499 case 3:
500 mode |= ATTR_ITALIC;
501 break;
502 case 7:
503 mode |= ATTR_REV;
504 break;
505 case 22:
506 mode &= ~ATTR_BOLD;
507 break;
508 case 23:
509 mode &= ~ATTR_ITALIC;
510 break;
511 case 27:
512 mode &= ~ATTR_REV;
513 break;
514 default:
515 if ((m / 10) == 3)
516 fg = m > 37 ? FGCOLOR : m - 30;
517 if ((m / 10) == 4)
518 bg = m > 47 ? BGCOLOR : m - 40;
519 }
520 }
521
522 static void kill_chars(int sc, int ec)
523 {
524 int i;
525 for (i = sc; i < ec; i++)
526 draw_char(0, row, i);
527 draw_cursor(1);
528 }
529
530 static void move_chars(int sc, int nc, int n)
531 {
532 draw_cursor(0);
533 screen_move(OFFSET(row, sc + n), OFFSET(row, sc), nc);
534 if (n > 0)
535 screen_reset(OFFSET(row, sc), n);
536 else
537 screen_reset(OFFSET(row, pad_cols() + n), -n);
538 draw_cols(row, MIN(sc, sc + n), pad_cols());
539 draw_cursor(1);
540 }
541
542 static void delete_chars(int n)
543 {
544 int sc = col + n;
545 int nc = pad_cols() - sc;
546 move_chars(sc, nc, -n);
547 }
548
549 static void insert_chars(int n)
550 {
551 int nc = pad_cols() - col - n;
552 move_chars(col, nc, n);
553 }
554
555 static void advance(int dr, int dc, int scrl)
556 {
557 int r = row + dr;
558 int c = col + dc;
559 if (dr && r >= bot && scrl) {
560 int n = bot - r - 1;
561 int nr = (bot - top) + n;
562 scroll_screen(top + -n, nr, n);
563 }
564 if (dr && r < top && scrl) {
565 int n = top - r;
566 int nr = (bot - top) - n;
567 scroll_screen(top, nr, n);
568 }
569 r = dr ? LIMIT(r, top, bot - 1) : r;
570 c = LIMIT(c, 0, pad_cols() - 1);
571 move_cursor(r, c);
572 }
573
574 static void insertchar(int c)
575 {
576 if (mode & MODE_WRAPREADY)
577 advance(1, -col, 1);
578 if (mode & MODE_INSERT)
579 insert_chars(1);
580 draw_char(c, row, col);
581 if (col == pad_cols() - 1)
582 mode = BIT_SET(mode, MODE_WRAPREADY, 1);
583 else
584 advance(0, 1, 1);
585 }
586
587
588 /* partial vt102 implementation */
589
590 static void escseq(void);
591 static void escseq_cs(void);
592 static void escseq_g0(void);
593 static void escseq_g1(void);
594 static void escseq_g2(void);
595 static void escseq_g3(void);
596 static void csiseq(void);
597 static void csiseq_da(int c);
598 static void csiseq_dsr(int c);
599 static void modeseq(int c, int set);
600
601 /* comments taken from: http://www.ivarch.com/programs/termvt102.shtml */
602
603 static int readutf8(int c)
604 {
605 int result;
606 int l = 1;
607 if (~c & 0xc0)
608 return c;
609 while (l < 6 && c & (0x40 >> l))
610 l++;
611 result = (0x3f >> l) & c;
612 while (l--)
613 result = (result << 6) | (readpty() & 0x3f);
614 return result;
615 }
616
617 #define unknown(ctl, c)
618
619 /* control sequences */
620 static void ctlseq(void)
621 {
622 int c = readpty();
623 switch (c) {
624 case 0x09: /* HT horizontal tab to next tab stop */
625 advance(0, 8 - col % 8, 0);
626 break;
627 case 0x0a: /* LF line feed */
628 case 0x0b: /* VT line feed */
629 case 0x0c: /* FF line feed */
630 advance(1, (mode & MODE_AUTOCR) ? -col : 0, 1);
631 break;
632 case 0x08: /* BS backspace one column */
633 advance(0, -1, 0);
634 break;
635 case 0x1b: /* ESC start escape sequence */
636 escseq();
637 break;
638 case 0x0d: /* CR carriage return */
639 advance(0, -col, 0);
640 break;
641 case 0x00: /* NUL ignored */
642 case 0x07: /* BEL beep */
643 case 0x7f: /* DEL ignored */
644 break;
645 case 0x05: /* ENQ trigger answerback message */
646 case 0x0e: /* SO activate G1 character set & newline */
647 case 0x0f: /* SI activate G0 character set */
648 case 0x11: /* XON resume transmission */
649 case 0x13: /* XOFF stop transmission, ignore characters */
650 case 0x18: /* CAN interrupt escape sequence */
651 case 0x1a: /* SUB interrupt escape sequence */
652 case 0x9b: /* CSI equivalent to ESC [ */
653 unknown("ctlseq", c);
654 break;
655 default:
656 c = readutf8(c);
657 if (isdw(c) && col + 1 == pad_cols() && ~mode & MODE_WRAPREADY)
658 insertchar(0);
659 if (!iszw(c))
660 insertchar(c);
661 if (isdw(c))
662 insertchar(c | DWCHAR);
663 break;
664 }
665 }
666
667 #define ESCM(c) (((c) & 0xf0) == 0x20)
668 #define ESCF(c) ((c) > 0x30 && (c) < 0x7f)
669
670 /* escape sequences */
671 static void escseq(void)
672 {
673 int c = readpty();
674 while (ESCM(c))
675 c = readpty();
676 switch (c) {
677 case '[': /* CSI control sequence introducer */
678 csiseq();
679 break;
680 case '%': /* CS... escseq_cs table */
681 escseq_cs();
682 break;
683 case '(': /* G0... escseq_g0 table */
684 escseq_g0();
685 break;
686 case ')': /* G1... escseq_g1 table */
687 escseq_g1();
688 break;
689 case '*': /* G2... escseq_g2 table */
690 escseq_g2();
691 break;
692 case '+': /* G3... escseq_g3 table */
693 escseq_g3();
694 break;
695 case '7': /* DECSC save state (position, charset, attributes) */
696 misc_save(&term->sav);
697 break;
698 case '8': /* DECRC restore most recently saved state */
699 misc_load(&term->sav);
700 break;
701 case 'M': /* RI reverse line feed */
702 advance(-1, 0, 1);
703 break;
704 case 'D': /* IND line feed */
705 advance(1, 0, 1);
706 break;
707 case 'E': /* NEL newline */
708 advance(1, -col, 1);
709 break;
710 case 'c': /* RIS reset */
711 term_reset();
712 break;
713 case 'H': /* HTS set tab stop at current column */
714 case 'Z': /* DECID DEC private ID; return ESC [ ? 6 c (VT102) */
715 case '#': /* DECALN ("#8") DEC alignment test - fill screen with E's */
716 case '>': /* DECPNM set numeric keypad mode */
717 case '=': /* DECPAM set application keypad mode */
718 case 'N': /* SS2 select G2 charset for next char only */
719 case 'O': /* SS3 select G3 charset for next char only */
720 case 'P': /* DCS device control string (ended by ST) */
721 case 'X': /* SOS start of string */
722 case '^': /* PM privacy message (ended by ST) */
723 case '_': /* APC application program command (ended by ST) */
724 case '\\': /* ST string terminator */
725 case 'n': /* LS2 invoke G2 charset */
726 case 'o': /* LS3 invoke G3 charset */
727 case '|': /* LS3R invoke G3 charset as GR */
728 case '}': /* LS2R invoke G2 charset as GR */
729 case '~': /* LS1R invoke G1 charset as GR */
730 case ']': /* OSC operating system command */
731 case 'g': /* BEL alternate BEL */
732 default:
733 unknown("escseq", c);
734 break;
735 }
736 }
737
738 static void escseq_cs(void)
739 {
740 int c = readpty();
741 switch (c) {
742 case '@': /* CSDFL select default charset (ISO646/8859-1) */
743 case 'G': /* CSUTF8 select UTF-8 */
744 case '8': /* CSUTF8 select UTF-8 (obsolete) */
745 default:
746 unknown("escseq_cs", c);
747 break;
748 }
749 }
750
751 static void escseq_g0(void)
752 {
753 int c = readpty();
754 switch (c) {
755 case '8': /* G0DFL G0 charset = default mapping (ISO8859-1) */
756 case '0': /* G0GFX G0 charset = VT100 graphics mapping */
757 case 'U': /* G0ROM G0 charset = null mapping (straight to ROM) */
758 case 'K': /* G0USR G0 charset = user defined mapping */
759 case 'B': /* G0TXT G0 charset = ASCII mapping */
760 default:
761 unknown("escseq_g0", c);
762 break;
763 }
764 }
765
766 static void escseq_g1(void)
767 {
768 int c = readpty();
769 switch (c) {
770 case '8': /* G1DFL G1 charset = default mapping (ISO8859-1) */
771 case '0': /* G1GFX G1 charset = VT100 graphics mapping */
772 case 'U': /* G1ROM G1 charset = null mapping (straight to ROM) */
773 case 'K': /* G1USR G1 charset = user defined mapping */
774 case 'B': /* G1TXT G1 charset = ASCII mapping */
775 default:
776 unknown("escseq_g1", c);
777 break;
778 }
779 }
780
781 static void escseq_g2(void)
782 {
783 int c = readpty();
784 switch (c) {
785 case '8': /* G2DFL G2 charset = default mapping (ISO8859-1) */
786 case '0': /* G2GFX G2 charset = VT100 graphics mapping */
787 case 'U': /* G2ROM G2 charset = null mapping (straight to ROM) */
788 case 'K': /* G2USR G2 charset = user defined mapping */
789 default:
790 unknown("escseq_g2", c);
791 break;
792 }
793 }
794
795 static void escseq_g3(void)
796 {
797 int c = readpty();
798 switch (c) {
799 case '8': /* G3DFL G3 charset = default mapping (ISO8859-1) */
800 case '0': /* G3GFX G3 charset = VT100 graphics mapping */
801 case 'U': /* G3ROM G3 charset = null mapping (straight to ROM) */
802 case 'K': /* G3USR G3 charset = user defined mapping */
803 default:
804 unknown("escseq_g3", c);
805 break;
806 }
807 }
808
809 static int absrow(int r)
810 {
811 return origin() ? top + r : r;
812 }
813
814 #define CSIP(c) (((c) & 0xf0) == 0x30)
815 #define CSII(c) (((c) & 0xf0) == 0x20)
816 #define CSIF(c) ((c) >= 0x40 && (c) < 0x80)
817
818 #define MAXCSIARGS 32
819 /* ECMA-48 CSI sequences */
820 static void csiseq(void)
821 {
822 int args[MAXCSIARGS] = {0};
823 int i;
824 int n = 0;
825 int c = readpty();
826 int priv = 0;
827
828 if (strchr("<=>?", c)) {
829 priv = c;
830 c = readpty();
831 }
832 while (CSIP(c)) {
833 int arg = 0;
834 while (isdigit(c)) {
835 arg = arg * 10 + (c - '0');
836 c = readpty();
837 }
838 if (CSIP(c))
839 c = readpty();
840 if (n < MAXCSIARGS)
841 args[n++] = arg;
842 }
843 while (CSII(c))
844 c = readpty();
845 switch (c) {
846 case 'H': /* CUP move cursor to row, column */
847 case 'f': /* HVP move cursor to row, column */
848 move_cursor(absrow(MAX(0, args[0] - 1)), MAX(0, args[1] - 1));
849 break;
850 case 'J': /* ED erase display */
851 switch (args[0]) {
852 case 0:
853 kill_chars(col, pad_cols());
854 blank_rows(row + 1, pad_rows());
855 break;
856 case 1:
857 kill_chars(0, col + 1);
858 blank_rows(0, row - 1);
859 break;
860 case 2:
861 term_blank();
862 break;
863 }
864 break;
865 case 'A': /* CUU move cursor up */
866 advance(-MAX(1, args[0]), 0, 0);
867 break;
868 case 'e': /* VPR move cursor down */
869 case 'B': /* CUD move cursor down */
870 advance(MAX(1, args[0]), 0, 0);
871 break;
872 case 'a': /* HPR move cursor right */
873 case 'C': /* CUF move cursor right */
874 advance(0, MAX(1, args[0]), 0);
875 break;
876 case 'D': /* CUB move cursor left */
877 advance(0, -MAX(1, args[0]), 0);
878 break;
879 case 'K': /* EL erase line */
880 switch (args[0]) {
881 case 0:
882 kill_chars(col, pad_cols());
883 break;
884 case 1:
885 kill_chars(0, col + 1);
886 break;
887 case 2:
888 kill_chars(0, pad_cols());
889 break;
890 }
891 break;
892 case 'L': /* IL insert blank lines */
893 if (row >= top && row < bot)
894 insert_lines(MAX(1, args[0]));
895 break;
896 case 'M': /* DL delete lines */
897 if (row >= top && row < bot)
898 delete_lines(MAX(1, args[0]));
899 break;
900 case 'd': /* VPA move to row (current column) */
901 move_cursor(absrow(MAX(1, args[0]) - 1), col);
902 break;
903 case 'm': /* SGR set graphic rendition */
904 if (!n)
905 setattr(0);
906 for (i = 0; i < n; i++)
907 setattr(args[i]);
908 break;
909 case 'r': /* DECSTBM set scrolling region to (top, bottom) rows */
910 set_region(args[0], args[1]);
911 break;
912 case 'c': /* DA return ESC [ ? 6 c (VT102) */
913 csiseq_da(priv == '?' ? args[0] | 0x80 : args[0]);
914 break;
915 case 'h': /* SM set mode */
916 for (i = 0; i < n; i++)
917 modeseq(priv == '?' ? args[i] | 0x80 : args[i], 1);
918 break;
919 case 'l': /* RM reset mode */
920 for (i = 0; i < n; i++)
921 modeseq(priv == '?' ? args[i] | 0x80 : args[i], 0);
922 break;
923 case 'P': /* DCH delete characters on current line */
924 delete_chars(LIMIT(args[0], 1, pad_cols() - col));
925 break;
926 case '@': /* ICH insert blank characters */
927 insert_chars(LIMIT(args[0], 1, pad_cols() - col));
928 break;
929 case 'n': /* DSR device status report */
930 csiseq_dsr(args[0]);
931 break;
932 case 'G': /* CHA move cursor to column in current row */
933 advance(0, MAX(0, args[0] - 1) - col, 0);
934 break;
935 case 'X': /* ECH erase characters on current line */
936 kill_chars(col, MIN(col + MAX(1, args[0]), pad_cols()));
937 break;
938 case '[': /* IGN ignored control sequence */
939 case 'E': /* CNL move cursor down and to column 1 */
940 case 'F': /* CPL move cursor up and to column 1 */
941 case 'g': /* TBC clear tab stop (CSI 3 g = clear all stops) */
942 case 'q': /* DECLL set keyboard LEDs */
943 case 's': /* CUPSV save cursor position */
944 case 'u': /* CUPRS restore cursor position */
945 case '`': /* HPA move cursor to column in current row */
946 default:
947 unknown("csiseq", c);
948 break;
949 }
950 }
951
952 static void csiseq_da(int c)
953 {
954 switch (c) {
955 case 0x00:
956 term_sendstr("\x1b[?6c");
957 break;
958 default:
959 /* we don't care much about cursor shape */
960 /* printf("csiseq_da <0x%x>\n", c); */
961 break;
962 }
963 }
964
965 static void csiseq_dsr(int c)
966 {
967 char status[1 << 5];
968 switch (c) {
969 case 0x05:
970 term_sendstr("\x1b[0n");
971 break;
972 case 0x06:
973 sprintf(status, "\x1b[%d;%dR",
974 (origin() ? row - top : row) + 1, col + 1);
975 term_sendstr(status);
976 break;
977 default:
978 unknown("csiseq_dsr", c);
979 break;
980 }
981 }
982
983 /* ANSI/DEC specified modes for SM/RM ANSI Specified Modes */
984 static void modeseq(int c, int set)
985 {
986 switch (c) {
987 case 0x87: /* DECAWM Auto Wrap */
988 mode = BIT_SET(mode, MODE_WRAP, set);
989 break;
990 case 0x99: /* DECTCEM Cursor on (set); Cursor off (reset) */
991 mode = BIT_SET(mode, MODE_CURSOR, set);
992 break;
993 case 0x86: /* DECOM Sets relative coordinates (set); Sets absolute coordinates (reset) */
994 mode = BIT_SET(mode, MODE_ORIGIN, set);
995 break;
996 case 0x14: /* LNM Line Feed / New Line Mode */
997 mode = BIT_SET(mode, MODE_AUTOCR, set);
998 break;
999 case 0x04: /* IRM insertion/replacement mode (always reset) */
1000 mode = BIT_SET(mode, MODE_INSERT, set);
1001 break;
1002 case 0x00: /* IGN Error (Ignored) */
1003 case 0x01: /* GATM guarded-area transfer mode (ignored) */
1004 case 0x02: /* KAM keyboard action mode (always reset) */
1005 case 0x03: /* CRM control representation mode (always reset) */
1006 case 0x05: /* SRTM status-reporting transfer mode */
1007 case 0x06: /* ERM erasure mode (always set) */
1008 case 0x07: /* VEM vertical editing mode (ignored) */
1009 case 0x0a: /* HEM horizontal editing mode */
1010 case 0x0b: /* PUM positioning unit mode */
1011 case 0x0c: /* SRM send/receive mode (echo on/off) */
1012 case 0x0d: /* FEAM format effector action mode */
1013 case 0x0e: /* FETM format effector transfer mode */
1014 case 0x0f: /* MATM multiple area transfer mode */
1015 case 0x10: /* TTM transfer termination mode */
1016 case 0x11: /* SATM selected area transfer mode */
1017 case 0x12: /* TSM tabulation stop mode */
1018 case 0x13: /* EBM editing boundary mode */
1019 /* DEC Private Modes: "?NUM" -> (NUM | 0x80) */
1020 case 0x80: /* IGN Error (Ignored) */
1021 case 0x81: /* DECCKM Cursorkeys application (set); Cursorkeys normal (reset) */
1022 case 0x82: /* DECANM ANSI (set); VT52 (reset) */
1023 case 0x83: /* DECCOLM 132 columns (set); 80 columns (reset) */
1024 case 0x84: /* DECSCLM Jump scroll (set); Smooth scroll (reset) */
1025 case 0x85: /* DECSCNM Reverse screen (set); Normal screen (reset) */
1026 case 0x88: /* DECARM Auto Repeat */
1027 case 0x89: /* DECINLM Interlace */
1028 case 0x92: /* DECPFF Send FF to printer after print screen (set); No char after PS (reset) */
1029 case 0x93: /* DECPEX Print screen: prints full screen (set); prints scroll region (reset) */
1030 default:
1031 unknown("modeseq", c);
1032 break;
1033 }
1034 }
A small linux framebuffer virtual terminal