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st.c - st - simple terminal
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st.c (58875B)
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1 /* See LICENSE for license details. */
2 #include <ctype.h>
3 #include <errno.h>
4 #include <fcntl.h>
5 #include <limits.h>
6 #include <pwd.h>
7 #include <stdarg.h>
8 #include <stdio.h>
9 #include <stdlib.h>
10 #include <string.h>
11 #include <signal.h>
12 #include <sys/ioctl.h>
13 #include <sys/select.h>
14 #include <sys/types.h>
15 #include <sys/wait.h>
16 #include <termios.h>
17 #include <unistd.h>
18 #include <wchar.h>
19
20 #include "st.h"
21 #include "win.h"
22
23 #if defined(__linux)
24 #include <pty.h>
25 #elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
26 #include <util.h>
27 #elif defined(__FreeBSD__) || defined(__DragonFly__)
28 #include <libutil.h>
29 #endif
30
31 /* Arbitrary sizes */
32 #define UTF_INVALID 0xFFFD
33 #define UTF_SIZ 4
34 #define ESC_BUF_SIZ (128*UTF_SIZ)
35 #define ESC_ARG_SIZ 16
36 #define STR_BUF_SIZ ESC_BUF_SIZ
37 #define STR_ARG_SIZ ESC_ARG_SIZ
38
39 /* macros */
40 #define IS_SET(flag) ((term.mode & (flag)) != 0)
41 #define ISCONTROLC0(c) (BETWEEN(c, 0, 0x1f) || (c) == 0x7…
42 #define ISCONTROLC1(c) (BETWEEN(c, 0x80, 0x9f))
43 #define ISCONTROL(c) (ISCONTROLC0(c) || ISCONTROLC1(c))
44 #define ISDELIM(u) (u && wcschr(worddelimiters, u))
45
46 enum term_mode {
47 MODE_WRAP = 1 << 0,
48 MODE_INSERT = 1 << 1,
49 MODE_ALTSCREEN = 1 << 2,
50 MODE_CRLF = 1 << 3,
51 MODE_ECHO = 1 << 4,
52 MODE_PRINT = 1 << 5,
53 MODE_UTF8 = 1 << 6,
54 };
55
56 enum cursor_movement {
57 CURSOR_SAVE,
58 CURSOR_LOAD
59 };
60
61 enum cursor_state {
62 CURSOR_DEFAULT = 0,
63 CURSOR_WRAPNEXT = 1,
64 CURSOR_ORIGIN = 2
65 };
66
67 enum charset {
68 CS_GRAPHIC0,
69 CS_GRAPHIC1,
70 CS_UK,
71 CS_USA,
72 CS_MULTI,
73 CS_GER,
74 CS_FIN
75 };
76
77 enum escape_state {
78 ESC_START = 1,
79 ESC_CSI = 2,
80 ESC_STR = 4, /* DCS, OSC, PM, APC */
81 ESC_ALTCHARSET = 8,
82 ESC_STR_END = 16, /* a final string was encountered */
83 ESC_TEST = 32, /* Enter in test mode */
84 ESC_UTF8 = 64,
85 };
86
87 typedef struct {
88 Glyph attr; /* current char attributes */
89 int x;
90 int y;
91 char state;
92 } TCursor;
93
94 typedef struct {
95 int mode;
96 int type;
97 int snap;
98 /*
99 * Selection variables:
100 * nb – normalized coordinates of the beginning of the selecti…
101 * ne – normalized coordinates of the end of the selection
102 * ob – original coordinates of the beginning of the selection
103 * oe – original coordinates of the end of the selection
104 */
105 struct {
106 int x, y;
107 } nb, ne, ob, oe;
108
109 int alt;
110 } Selection;
111
112 /* Internal representation of the screen */
113 typedef struct {
114 int row; /* nb row */
115 int col; /* nb col */
116 Line *line; /* screen */
117 Line *alt; /* alternate screen */
118 int *dirty; /* dirtyness of lines */
119 TCursor c; /* cursor */
120 int ocx; /* old cursor col */
121 int ocy; /* old cursor row */
122 int top; /* top scroll limit */
123 int bot; /* bottom scroll limit */
124 int mode; /* terminal mode flags */
125 int esc; /* escape state flags */
126 char trantbl[4]; /* charset table translation */
127 int charset; /* current charset */
128 int icharset; /* selected charset for sequence */
129 int *tabs;
130 Rune lastc; /* last printed char outside of sequence, 0 if con…
131 } Term;
132
133 /* CSI Escape sequence structs */
134 /* ESC '[' [[ [<priv>] <arg> [;]] <mode> [<mode>]] */
135 typedef struct {
136 char buf[ESC_BUF_SIZ]; /* raw string */
137 size_t len; /* raw string length */
138 char priv;
139 int arg[ESC_ARG_SIZ];
140 int narg; /* nb of args */
141 char mode[2];
142 } CSIEscape;
143
144 /* STR Escape sequence structs */
145 /* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
146 typedef struct {
147 char type; /* ESC type ... */
148 char *buf; /* allocated raw string */
149 size_t siz; /* allocation size */
150 size_t len; /* raw string length */
151 char *args[STR_ARG_SIZ];
152 int narg; /* nb of args */
153 } STREscape;
154
155 static void execsh(char *, char **);
156 static void stty(char **);
157 static void sigchld(int);
158 static void ttywriteraw(const char *, size_t);
159
160 static void csidump(void);
161 static void csihandle(void);
162 static void csiparse(void);
163 static void csireset(void);
164 static void osc_color_response(int, int, int);
165 static int eschandle(uchar);
166 static void strdump(void);
167 static void strhandle(void);
168 static void strparse(void);
169 static void strreset(void);
170
171 static void tprinter(char *, size_t);
172 static void tdumpsel(void);
173 static void tdumpline(int);
174 static void tdump(void);
175 static void tclearregion(int, int, int, int);
176 static void tcursor(int);
177 static void tdeletechar(int);
178 static void tdeleteline(int);
179 static void tinsertblank(int);
180 static void tinsertblankline(int);
181 static int tlinelen(int);
182 static void tmoveto(int, int);
183 static void tmoveato(int, int);
184 static void tnewline(int);
185 static void tputtab(int);
186 static void tputc(Rune);
187 static void treset(void);
188 static void tscrollup(int, int);
189 static void tscrolldown(int, int);
190 static void tsetattr(const int *, int);
191 static void tsetchar(Rune, const Glyph *, int, int);
192 static void tsetdirt(int, int);
193 static void tsetscroll(int, int);
194 static void tswapscreen(void);
195 static void tsetmode(int, int, const int *, int);
196 static int twrite(const char *, int, int);
197 static void tfulldirt(void);
198 static void tcontrolcode(uchar );
199 static void tdectest(char );
200 static void tdefutf8(char);
201 static int32_t tdefcolor(const int *, int *, int);
202 static void tdeftran(char);
203 static void tstrsequence(uchar);
204
205 static void drawregion(int, int, int, int);
206
207 static void selnormalize(void);
208 static void selscroll(int, int);
209 static void selsnap(int *, int *, int);
210
211 static size_t utf8decode(const char *, Rune *, size_t);
212 static Rune utf8decodebyte(char, size_t *);
213 static char utf8encodebyte(Rune, size_t);
214 static size_t utf8validate(Rune *, size_t);
215
216 static char *base64dec(const char *);
217 static char base64dec_getc(const char **);
218
219 static ssize_t xwrite(int, const char *, size_t);
220
221 /* Globals */
222 static Term term;
223 static Selection sel;
224 static CSIEscape csiescseq;
225 static STREscape strescseq;
226 static int iofd = 1;
227 static int cmdfd;
228 static pid_t pid;
229
230 static const uchar utfbyte[UTF_SIZ + 1] = {0x80, 0, 0xC0, 0xE0, 0xF0};
231 static const uchar utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
232 static const Rune utfmin[UTF_SIZ + 1] = { 0, 0, 0x80, 0x800, …
233 static const Rune utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, …
234
235 ssize_t
236 xwrite(int fd, const char *s, size_t len)
237 {
238 size_t aux = len;
239 ssize_t r;
240
241 while (len > 0) {
242 r = write(fd, s, len);
243 if (r < 0)
244 return r;
245 len -= r;
246 s += r;
247 }
248
249 return aux;
250 }
251
252 void *
253 xmalloc(size_t len)
254 {
255 void *p;
256
257 if (!(p = malloc(len)))
258 die("malloc: %s\n", strerror(errno));
259
260 return p;
261 }
262
263 void *
264 xrealloc(void *p, size_t len)
265 {
266 if ((p = realloc(p, len)) == NULL)
267 die("realloc: %s\n", strerror(errno));
268
269 return p;
270 }
271
272 char *
273 xstrdup(const char *s)
274 {
275 char *p;
276
277 if ((p = strdup(s)) == NULL)
278 die("strdup: %s\n", strerror(errno));
279
280 return p;
281 }
282
283 size_t
284 utf8decode(const char *c, Rune *u, size_t clen)
285 {
286 size_t i, j, len, type;
287 Rune udecoded;
288
289 *u = UTF_INVALID;
290 if (!clen)
291 return 0;
292 udecoded = utf8decodebyte(c[0], &len);
293 if (!BETWEEN(len, 1, UTF_SIZ))
294 return 1;
295 for (i = 1, j = 1; i < clen && j < len; ++i, ++j) {
296 udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
297 if (type != 0)
298 return j;
299 }
300 if (j < len)
301 return 0;
302 *u = udecoded;
303 utf8validate(u, len);
304
305 return len;
306 }
307
308 Rune
309 utf8decodebyte(char c, size_t *i)
310 {
311 for (*i = 0; *i < LEN(utfmask); ++(*i))
312 if (((uchar)c & utfmask[*i]) == utfbyte[*i])
313 return (uchar)c & ~utfmask[*i];
314
315 return 0;
316 }
317
318 size_t
319 utf8encode(Rune u, char *c)
320 {
321 size_t len, i;
322
323 len = utf8validate(&u, 0);
324 if (len > UTF_SIZ)
325 return 0;
326
327 for (i = len - 1; i != 0; --i) {
328 c[i] = utf8encodebyte(u, 0);
329 u >>= 6;
330 }
331 c[0] = utf8encodebyte(u, len);
332
333 return len;
334 }
335
336 char
337 utf8encodebyte(Rune u, size_t i)
338 {
339 return utfbyte[i] | (u & ~utfmask[i]);
340 }
341
342 size_t
343 utf8validate(Rune *u, size_t i)
344 {
345 if (!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0x…
346 *u = UTF_INVALID;
347 for (i = 1; *u > utfmax[i]; ++i)
348 ;
349
350 return i;
351 }
352
353 char
354 base64dec_getc(const char **src)
355 {
356 while (**src && !isprint((unsigned char)**src))
357 (*src)++;
358 return **src ? *((*src)++) : '='; /* emulate padding if string …
359 }
360
361 char *
362 base64dec(const char *src)
363 {
364 size_t in_len = strlen(src);
365 char *result, *dst;
366 static const char base64_digits[256] = {
367 [43] = 62, 0, 0, 0, 63, 52, 53, 54, 55, 56, 57, 58, 59, …
368 0, 0, 0, -1, 0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, …
369 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 0, 0…
370 0, 0, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38…
371 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51
372 };
373
374 if (in_len % 4)
375 in_len += 4 - (in_len % 4);
376 result = dst = xmalloc(in_len / 4 * 3 + 1);
377 while (*src) {
378 int a = base64_digits[(unsigned char) base64dec_getc(&sr…
379 int b = base64_digits[(unsigned char) base64dec_getc(&sr…
380 int c = base64_digits[(unsigned char) base64dec_getc(&sr…
381 int d = base64_digits[(unsigned char) base64dec_getc(&sr…
382
383 /* invalid input. 'a' can be -1, e.g. if src is "\n" (c-…
384 if (a == -1 || b == -1)
385 break;
386
387 *dst++ = (a << 2) | ((b & 0x30) >> 4);
388 if (c == -1)
389 break;
390 *dst++ = ((b & 0x0f) << 4) | ((c & 0x3c) >> 2);
391 if (d == -1)
392 break;
393 *dst++ = ((c & 0x03) << 6) | d;
394 }
395 *dst = '\0';
396 return result;
397 }
398
399 void
400 selinit(void)
401 {
402 sel.mode = SEL_IDLE;
403 sel.snap = 0;
404 sel.ob.x = -1;
405 }
406
407 int
408 tlinelen(int y)
409 {
410 int i = term.col;
411
412 if (term.line[y][i - 1].mode & ATTR_WRAP)
413 return i;
414
415 while (i > 0 && term.line[y][i - 1].u == ' ')
416 --i;
417
418 return i;
419 }
420
421 void
422 selstart(int col, int row, int snap)
423 {
424 selclear();
425 sel.mode = SEL_EMPTY;
426 sel.type = SEL_REGULAR;
427 sel.alt = IS_SET(MODE_ALTSCREEN);
428 sel.snap = snap;
429 sel.oe.x = sel.ob.x = col;
430 sel.oe.y = sel.ob.y = row;
431 selnormalize();
432
433 if (sel.snap != 0)
434 sel.mode = SEL_READY;
435 tsetdirt(sel.nb.y, sel.ne.y);
436 }
437
438 void
439 selextend(int col, int row, int type, int done)
440 {
441 int oldey, oldex, oldsby, oldsey, oldtype;
442
443 if (sel.mode == SEL_IDLE)
444 return;
445 if (done && sel.mode == SEL_EMPTY) {
446 selclear();
447 return;
448 }
449
450 oldey = sel.oe.y;
451 oldex = sel.oe.x;
452 oldsby = sel.nb.y;
453 oldsey = sel.ne.y;
454 oldtype = sel.type;
455
456 sel.oe.x = col;
457 sel.oe.y = row;
458 selnormalize();
459 sel.type = type;
460
461 if (oldey != sel.oe.y || oldex != sel.oe.x || oldtype != sel.typ…
462 tsetdirt(MIN(sel.nb.y, oldsby), MAX(sel.ne.y, oldsey));
463
464 sel.mode = done ? SEL_IDLE : SEL_READY;
465 }
466
467 void
468 selnormalize(void)
469 {
470 int i;
471
472 if (sel.type == SEL_REGULAR && sel.ob.y != sel.oe.y) {
473 sel.nb.x = sel.ob.y < sel.oe.y ? sel.ob.x : sel.oe.x;
474 sel.ne.x = sel.ob.y < sel.oe.y ? sel.oe.x : sel.ob.x;
475 } else {
476 sel.nb.x = MIN(sel.ob.x, sel.oe.x);
477 sel.ne.x = MAX(sel.ob.x, sel.oe.x);
478 }
479 sel.nb.y = MIN(sel.ob.y, sel.oe.y);
480 sel.ne.y = MAX(sel.ob.y, sel.oe.y);
481
482 selsnap(&sel.nb.x, &sel.nb.y, -1);
483 selsnap(&sel.ne.x, &sel.ne.y, +1);
484
485 /* expand selection over line breaks */
486 if (sel.type == SEL_RECTANGULAR)
487 return;
488 i = tlinelen(sel.nb.y);
489 if (i < sel.nb.x)
490 sel.nb.x = i;
491 if (tlinelen(sel.ne.y) <= sel.ne.x)
492 sel.ne.x = term.col - 1;
493 }
494
495 int
496 selected(int x, int y)
497 {
498 if (sel.mode == SEL_EMPTY || sel.ob.x == -1 ||
499 sel.alt != IS_SET(MODE_ALTSCREEN))
500 return 0;
501
502 if (sel.type == SEL_RECTANGULAR)
503 return BETWEEN(y, sel.nb.y, sel.ne.y)
504 && BETWEEN(x, sel.nb.x, sel.ne.x);
505
506 return BETWEEN(y, sel.nb.y, sel.ne.y)
507 && (y != sel.nb.y || x >= sel.nb.x)
508 && (y != sel.ne.y || x <= sel.ne.x);
509 }
510
511 void
512 selsnap(int *x, int *y, int direction)
513 {
514 int newx, newy, xt, yt;
515 int delim, prevdelim;
516 const Glyph *gp, *prevgp;
517
518 switch (sel.snap) {
519 case SNAP_WORD:
520 /*
521 * Snap around if the word wraps around at the end or
522 * beginning of a line.
523 */
524 prevgp = &term.line[*y][*x];
525 prevdelim = ISDELIM(prevgp->u);
526 for (;;) {
527 newx = *x + direction;
528 newy = *y;
529 if (!BETWEEN(newx, 0, term.col - 1)) {
530 newy += direction;
531 newx = (newx + term.col) % term.col;
532 if (!BETWEEN(newy, 0, term.row - 1))
533 break;
534
535 if (direction > 0)
536 yt = *y, xt = *x;
537 else
538 yt = newy, xt = newx;
539 if (!(term.line[yt][xt].mode & ATTR_WRAP…
540 break;
541 }
542
543 if (newx >= tlinelen(newy))
544 break;
545
546 gp = &term.line[newy][newx];
547 delim = ISDELIM(gp->u);
548 if (!(gp->mode & ATTR_WDUMMY) && (delim != prevd…
549 || (delim && gp->u != prevgp->u)…
550 break;
551
552 *x = newx;
553 *y = newy;
554 prevgp = gp;
555 prevdelim = delim;
556 }
557 break;
558 case SNAP_LINE:
559 /*
560 * Snap around if the the previous line or the current o…
561 * has set ATTR_WRAP at its end. Then the whole next or
562 * previous line will be selected.
563 */
564 *x = (direction < 0) ? 0 : term.col - 1;
565 if (direction < 0) {
566 for (; *y > 0; *y += direction) {
567 if (!(term.line[*y-1][term.col-1].mode
568 & ATTR_WRAP)) {
569 break;
570 }
571 }
572 } else if (direction > 0) {
573 for (; *y < term.row-1; *y += direction) {
574 if (!(term.line[*y][term.col-1].mode
575 & ATTR_WRAP)) {
576 break;
577 }
578 }
579 }
580 break;
581 }
582 }
583
584 char *
585 getsel(void)
586 {
587 char *str, *ptr;
588 int y, bufsize, lastx, linelen;
589 const Glyph *gp, *last;
590
591 if (sel.ob.x == -1)
592 return NULL;
593
594 bufsize = (term.col+1) * (sel.ne.y-sel.nb.y+1) * UTF_SIZ;
595 ptr = str = xmalloc(bufsize);
596
597 /* append every set & selected glyph to the selection */
598 for (y = sel.nb.y; y <= sel.ne.y; y++) {
599 if ((linelen = tlinelen(y)) == 0) {
600 *ptr++ = '\n';
601 continue;
602 }
603
604 if (sel.type == SEL_RECTANGULAR) {
605 gp = &term.line[y][sel.nb.x];
606 lastx = sel.ne.x;
607 } else {
608 gp = &term.line[y][sel.nb.y == y ? sel.nb.x : 0];
609 lastx = (sel.ne.y == y) ? sel.ne.x : term.col-1;
610 }
611 last = &term.line[y][MIN(lastx, linelen-1)];
612 while (last >= gp && last->u == ' ')
613 --last;
614
615 for ( ; gp <= last; ++gp) {
616 if (gp->mode & ATTR_WDUMMY)
617 continue;
618
619 ptr += utf8encode(gp->u, ptr);
620 }
621
622 /*
623 * Copy and pasting of line endings is inconsistent
624 * in the inconsistent terminal and GUI world.
625 * The best solution seems like to produce '\n' when
626 * something is copied from st and convert '\n' to
627 * '\r', when something to be pasted is received by
628 * st.
629 * FIXME: Fix the computer world.
630 */
631 if ((y < sel.ne.y || lastx >= linelen) &&
632 (!(last->mode & ATTR_WRAP) || sel.type == SEL_RECTAN…
633 *ptr++ = '\n';
634 }
635 *ptr = 0;
636 return str;
637 }
638
639 void
640 selclear(void)
641 {
642 if (sel.ob.x == -1)
643 return;
644 sel.mode = SEL_IDLE;
645 sel.ob.x = -1;
646 tsetdirt(sel.nb.y, sel.ne.y);
647 }
648
649 void
650 die(const char *errstr, ...)
651 {
652 va_list ap;
653
654 va_start(ap, errstr);
655 vfprintf(stderr, errstr, ap);
656 va_end(ap);
657 exit(1);
658 }
659
660 void
661 execsh(char *cmd, char **args)
662 {
663 char *sh, *prog, *arg;
664 const struct passwd *pw;
665
666 errno = 0;
667 if ((pw = getpwuid(getuid())) == NULL) {
668 if (errno)
669 die("getpwuid: %s\n", strerror(errno));
670 else
671 die("who are you?\n");
672 }
673
674 if ((sh = getenv("SHELL")) == NULL)
675 sh = (pw->pw_shell[0]) ? pw->pw_shell : cmd;
676
677 if (args) {
678 prog = args[0];
679 arg = NULL;
680 } else if (scroll) {
681 prog = scroll;
682 arg = utmp ? utmp : sh;
683 } else if (utmp) {
684 prog = utmp;
685 arg = NULL;
686 } else {
687 prog = sh;
688 arg = NULL;
689 }
690 DEFAULT(args, ((char *[]) {prog, arg, NULL}));
691
692 unsetenv("COLUMNS");
693 unsetenv("LINES");
694 unsetenv("TERMCAP");
695 setenv("LOGNAME", pw->pw_name, 1);
696 setenv("USER", pw->pw_name, 1);
697 setenv("SHELL", sh, 1);
698 setenv("HOME", pw->pw_dir, 1);
699 setenv("TERM", termname, 1);
700
701 signal(SIGCHLD, SIG_DFL);
702 signal(SIGHUP, SIG_DFL);
703 signal(SIGINT, SIG_DFL);
704 signal(SIGQUIT, SIG_DFL);
705 signal(SIGTERM, SIG_DFL);
706 signal(SIGALRM, SIG_DFL);
707
708 execvp(prog, args);
709 _exit(1);
710 }
711
712 void
713 sigchld(int a)
714 {
715 int stat;
716 pid_t p;
717
718 if ((p = waitpid(pid, &stat, WNOHANG)) < 0)
719 die("waiting for pid %hd failed: %s\n", pid, strerror(er…
720
721 if (pid != p)
722 return;
723
724 if (WIFEXITED(stat) && WEXITSTATUS(stat))
725 die("child exited with status %d\n", WEXITSTATUS(stat));
726 else if (WIFSIGNALED(stat))
727 die("child terminated due to signal %d\n", WTERMSIG(stat…
728 _exit(0);
729 }
730
731 void
732 stty(char **args)
733 {
734 char cmd[_POSIX_ARG_MAX], **p, *q, *s;
735 size_t n, siz;
736
737 if ((n = strlen(stty_args)) > sizeof(cmd)-1)
738 die("incorrect stty parameters\n");
739 memcpy(cmd, stty_args, n);
740 q = cmd + n;
741 siz = sizeof(cmd) - n;
742 for (p = args; p && (s = *p); ++p) {
743 if ((n = strlen(s)) > siz-1)
744 die("stty parameter length too long\n");
745 *q++ = ' ';
746 memcpy(q, s, n);
747 q += n;
748 siz -= n + 1;
749 }
750 *q = '\0';
751 if (system(cmd) != 0)
752 perror("Couldn't call stty");
753 }
754
755 int
756 ttynew(const char *line, char *cmd, const char *out, char **args)
757 {
758 int m, s;
759
760 if (out) {
761 term.mode |= MODE_PRINT;
762 iofd = (!strcmp(out, "-")) ?
763 1 : open(out, O_WRONLY | O_CREAT, 0666);
764 if (iofd < 0) {
765 fprintf(stderr, "Error opening %s:%s\n",
766 out, strerror(errno));
767 }
768 }
769
770 if (line) {
771 if ((cmdfd = open(line, O_RDWR)) < 0)
772 die("open line '%s' failed: %s\n",
773 line, strerror(errno));
774 dup2(cmdfd, 0);
775 stty(args);
776 return cmdfd;
777 }
778
779 /* seems to work fine on linux, openbsd and freebsd */
780 if (openpty(&m, &s, NULL, NULL, NULL) < 0)
781 die("openpty failed: %s\n", strerror(errno));
782
783 switch (pid = fork()) {
784 case -1:
785 die("fork failed: %s\n", strerror(errno));
786 break;
787 case 0:
788 close(iofd);
789 close(m);
790 setsid(); /* create a new process group */
791 dup2(s, 0);
792 dup2(s, 1);
793 dup2(s, 2);
794 if (ioctl(s, TIOCSCTTY, NULL) < 0)
795 die("ioctl TIOCSCTTY failed: %s\n", strerror(err…
796 if (s > 2)
797 close(s);
798 #ifdef __OpenBSD__
799 if (pledge("stdio getpw proc exec", NULL) == -1)
800 die("pledge\n");
801 #endif
802 execsh(cmd, args);
803 break;
804 default:
805 #ifdef __OpenBSD__
806 if (pledge("stdio rpath tty proc", NULL) == -1)
807 die("pledge\n");
808 #endif
809 close(s);
810 cmdfd = m;
811 signal(SIGCHLD, sigchld);
812 break;
813 }
814 return cmdfd;
815 }
816
817 size_t
818 ttyread(void)
819 {
820 static char buf[BUFSIZ];
821 static int buflen = 0;
822 int ret, written;
823
824 /* append read bytes to unprocessed bytes */
825 ret = read(cmdfd, buf+buflen, LEN(buf)-buflen);
826
827 switch (ret) {
828 case 0:
829 exit(0);
830 case -1:
831 die("couldn't read from shell: %s\n", strerror(errno));
832 default:
833 buflen += ret;
834 written = twrite(buf, buflen, 0);
835 buflen -= written;
836 /* keep any incomplete UTF-8 byte sequence for the next …
837 if (buflen > 0)
838 memmove(buf, buf + written, buflen);
839 return ret;
840 }
841 }
842
843 void
844 ttywrite(const char *s, size_t n, int may_echo)
845 {
846 const char *next;
847
848 if (may_echo && IS_SET(MODE_ECHO))
849 twrite(s, n, 1);
850
851 if (!IS_SET(MODE_CRLF)) {
852 ttywriteraw(s, n);
853 return;
854 }
855
856 /* This is similar to how the kernel handles ONLCR for ttys */
857 while (n > 0) {
858 if (*s == '\r') {
859 next = s + 1;
860 ttywriteraw("\r\n", 2);
861 } else {
862 next = memchr(s, '\r', n);
863 DEFAULT(next, s + n);
864 ttywriteraw(s, next - s);
865 }
866 n -= next - s;
867 s = next;
868 }
869 }
870
871 void
872 ttywriteraw(const char *s, size_t n)
873 {
874 fd_set wfd, rfd;
875 ssize_t r;
876 size_t lim = 256;
877
878 /*
879 * Remember that we are using a pty, which might be a modem line.
880 * Writing too much will clog the line. That's why we are doing …
881 * dance.
882 * FIXME: Migrate the world to Plan 9.
883 */
884 while (n > 0) {
885 FD_ZERO(&wfd);
886 FD_ZERO(&rfd);
887 FD_SET(cmdfd, &wfd);
888 FD_SET(cmdfd, &rfd);
889
890 /* Check if we can write. */
891 if (pselect(cmdfd+1, &rfd, &wfd, NULL, NULL, NULL) < 0) {
892 if (errno == EINTR)
893 continue;
894 die("select failed: %s\n", strerror(errno));
895 }
896 if (FD_ISSET(cmdfd, &wfd)) {
897 /*
898 * Only write the bytes written by ttywrite() or…
899 * default of 256. This seems to be a reasonable…
900 * for a serial line. Bigger values might clog t…
901 */
902 if ((r = write(cmdfd, s, (n < lim)? n : lim)) < …
903 goto write_error;
904 if (r < n) {
905 /*
906 * We weren't able to write out everythi…
907 * This means the buffer is getting full
908 * again. Empty it.
909 */
910 if (n < lim)
911 lim = ttyread();
912 n -= r;
913 s += r;
914 } else {
915 /* All bytes have been written. */
916 break;
917 }
918 }
919 if (FD_ISSET(cmdfd, &rfd))
920 lim = ttyread();
921 }
922 return;
923
924 write_error:
925 die("write error on tty: %s\n", strerror(errno));
926 }
927
928 void
929 ttyresize(int tw, int th)
930 {
931 struct winsize w;
932
933 w.ws_row = term.row;
934 w.ws_col = term.col;
935 w.ws_xpixel = tw;
936 w.ws_ypixel = th;
937 if (ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
938 fprintf(stderr, "Couldn't set window size: %s\n", strerr…
939 }
940
941 void
942 ttyhangup(void)
943 {
944 /* Send SIGHUP to shell */
945 kill(pid, SIGHUP);
946 }
947
948 int
949 tattrset(int attr)
950 {
951 int i, j;
952
953 for (i = 0; i < term.row-1; i++) {
954 for (j = 0; j < term.col-1; j++) {
955 if (term.line[i][j].mode & attr)
956 return 1;
957 }
958 }
959
960 return 0;
961 }
962
963 void
964 tsetdirt(int top, int bot)
965 {
966 int i;
967
968 LIMIT(top, 0, term.row-1);
969 LIMIT(bot, 0, term.row-1);
970
971 for (i = top; i <= bot; i++)
972 term.dirty[i] = 1;
973 }
974
975 void
976 tsetdirtattr(int attr)
977 {
978 int i, j;
979
980 for (i = 0; i < term.row-1; i++) {
981 for (j = 0; j < term.col-1; j++) {
982 if (term.line[i][j].mode & attr) {
983 tsetdirt(i, i);
984 break;
985 }
986 }
987 }
988 }
989
990 void
991 tfulldirt(void)
992 {
993 tsetdirt(0, term.row-1);
994 }
995
996 void
997 tcursor(int mode)
998 {
999 static TCursor c[2];
1000 int alt = IS_SET(MODE_ALTSCREEN);
1001
1002 if (mode == CURSOR_SAVE) {
1003 c[alt] = term.c;
1004 } else if (mode == CURSOR_LOAD) {
1005 term.c = c[alt];
1006 tmoveto(c[alt].x, c[alt].y);
1007 }
1008 }
1009
1010 void
1011 treset(void)
1012 {
1013 uint i;
1014
1015 term.c = (TCursor){{
1016 .mode = ATTR_NULL,
1017 .fg = defaultfg,
1018 .bg = defaultbg
1019 }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
1020
1021 memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1022 for (i = tabspaces; i < term.col; i += tabspaces)
1023 term.tabs[i] = 1;
1024 term.top = 0;
1025 term.bot = term.row - 1;
1026 term.mode = MODE_WRAP|MODE_UTF8;
1027 memset(term.trantbl, CS_USA, sizeof(term.trantbl));
1028 term.charset = 0;
1029
1030 for (i = 0; i < 2; i++) {
1031 tmoveto(0, 0);
1032 tcursor(CURSOR_SAVE);
1033 tclearregion(0, 0, term.col-1, term.row-1);
1034 tswapscreen();
1035 }
1036 }
1037
1038 void
1039 tnew(int col, int row)
1040 {
1041 term = (Term){ .c = { .attr = { .fg = defaultfg, .bg = defaultbg…
1042 tresize(col, row);
1043 treset();
1044 }
1045
1046 void
1047 tswapscreen(void)
1048 {
1049 Line *tmp = term.line;
1050
1051 term.line = term.alt;
1052 term.alt = tmp;
1053 term.mode ^= MODE_ALTSCREEN;
1054 tfulldirt();
1055 }
1056
1057 void
1058 tscrolldown(int orig, int n)
1059 {
1060 int i;
1061 Line temp;
1062
1063 LIMIT(n, 0, term.bot-orig+1);
1064
1065 tsetdirt(orig, term.bot-n);
1066 tclearregion(0, term.bot-n+1, term.col-1, term.bot);
1067
1068 for (i = term.bot; i >= orig+n; i--) {
1069 temp = term.line[i];
1070 term.line[i] = term.line[i-n];
1071 term.line[i-n] = temp;
1072 }
1073
1074 selscroll(orig, n);
1075 }
1076
1077 void
1078 tscrollup(int orig, int n)
1079 {
1080 int i;
1081 Line temp;
1082
1083 LIMIT(n, 0, term.bot-orig+1);
1084
1085 tclearregion(0, orig, term.col-1, orig+n-1);
1086 tsetdirt(orig+n, term.bot);
1087
1088 for (i = orig; i <= term.bot-n; i++) {
1089 temp = term.line[i];
1090 term.line[i] = term.line[i+n];
1091 term.line[i+n] = temp;
1092 }
1093
1094 selscroll(orig, -n);
1095 }
1096
1097 void
1098 selscroll(int orig, int n)
1099 {
1100 if (sel.ob.x == -1 || sel.alt != IS_SET(MODE_ALTSCREEN))
1101 return;
1102
1103 if (BETWEEN(sel.nb.y, orig, term.bot) != BETWEEN(sel.ne.y, orig,…
1104 selclear();
1105 } else if (BETWEEN(sel.nb.y, orig, term.bot)) {
1106 sel.ob.y += n;
1107 sel.oe.y += n;
1108 if (sel.ob.y < term.top || sel.ob.y > term.bot ||
1109 sel.oe.y < term.top || sel.oe.y > term.bot) {
1110 selclear();
1111 } else {
1112 selnormalize();
1113 }
1114 }
1115 }
1116
1117 void
1118 tnewline(int first_col)
1119 {
1120 int y = term.c.y;
1121
1122 if (y == term.bot) {
1123 tscrollup(term.top, 1);
1124 } else {
1125 y++;
1126 }
1127 tmoveto(first_col ? 0 : term.c.x, y);
1128 }
1129
1130 void
1131 csiparse(void)
1132 {
1133 char *p = csiescseq.buf, *np;
1134 long int v;
1135 int sep = ';'; /* colon or semi-colon, but not both */
1136
1137 csiescseq.narg = 0;
1138 if (*p == '?') {
1139 csiescseq.priv = 1;
1140 p++;
1141 }
1142
1143 csiescseq.buf[csiescseq.len] = '\0';
1144 while (p < csiescseq.buf+csiescseq.len) {
1145 np = NULL;
1146 v = strtol(p, &np, 10);
1147 if (np == p)
1148 v = 0;
1149 if (v == LONG_MAX || v == LONG_MIN)
1150 v = -1;
1151 csiescseq.arg[csiescseq.narg++] = v;
1152 p = np;
1153 if (sep == ';' && *p == ':')
1154 sep = ':'; /* allow override to colon once */
1155 if (*p != sep || csiescseq.narg == ESC_ARG_SIZ)
1156 break;
1157 p++;
1158 }
1159 csiescseq.mode[0] = *p++;
1160 csiescseq.mode[1] = (p < csiescseq.buf+csiescseq.len) ? *p : '\0…
1161 }
1162
1163 /* for absolute user moves, when decom is set */
1164 void
1165 tmoveato(int x, int y)
1166 {
1167 tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
1168 }
1169
1170 void
1171 tmoveto(int x, int y)
1172 {
1173 int miny, maxy;
1174
1175 if (term.c.state & CURSOR_ORIGIN) {
1176 miny = term.top;
1177 maxy = term.bot;
1178 } else {
1179 miny = 0;
1180 maxy = term.row - 1;
1181 }
1182 term.c.state &= ~CURSOR_WRAPNEXT;
1183 term.c.x = LIMIT(x, 0, term.col-1);
1184 term.c.y = LIMIT(y, miny, maxy);
1185 }
1186
1187 void
1188 tsetchar(Rune u, const Glyph *attr, int x, int y)
1189 {
1190 static const char *vt100_0[62] = { /* 0x41 - 0x7e */
1191 "↑", "↓", "→", "←", "█", "▚", "☃", /* A - …
1192 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
1193 0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
1194 0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
1195 "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /*…
1196 "␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", …
1197 "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", …
1198 "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
1199 };
1200
1201 /*
1202 * The table is proudly stolen from rxvt.
1203 */
1204 if (term.trantbl[term.charset] == CS_GRAPHIC0 &&
1205 BETWEEN(u, 0x41, 0x7e) && vt100_0[u - 0x41])
1206 utf8decode(vt100_0[u - 0x41], &u, UTF_SIZ);
1207
1208 if (term.line[y][x].mode & ATTR_WIDE) {
1209 if (x+1 < term.col) {
1210 term.line[y][x+1].u = ' ';
1211 term.line[y][x+1].mode &= ~ATTR_WDUMMY;
1212 }
1213 } else if (term.line[y][x].mode & ATTR_WDUMMY) {
1214 term.line[y][x-1].u = ' ';
1215 term.line[y][x-1].mode &= ~ATTR_WIDE;
1216 }
1217
1218 term.dirty[y] = 1;
1219 term.line[y][x] = *attr;
1220 term.line[y][x].u = u;
1221 }
1222
1223 void
1224 tclearregion(int x1, int y1, int x2, int y2)
1225 {
1226 int x, y, temp;
1227 Glyph *gp;
1228
1229 if (x1 > x2)
1230 temp = x1, x1 = x2, x2 = temp;
1231 if (y1 > y2)
1232 temp = y1, y1 = y2, y2 = temp;
1233
1234 LIMIT(x1, 0, term.col-1);
1235 LIMIT(x2, 0, term.col-1);
1236 LIMIT(y1, 0, term.row-1);
1237 LIMIT(y2, 0, term.row-1);
1238
1239 for (y = y1; y <= y2; y++) {
1240 term.dirty[y] = 1;
1241 for (x = x1; x <= x2; x++) {
1242 gp = &term.line[y][x];
1243 if (selected(x, y))
1244 selclear();
1245 gp->fg = term.c.attr.fg;
1246 gp->bg = term.c.attr.bg;
1247 gp->mode = 0;
1248 gp->u = ' ';
1249 }
1250 }
1251 }
1252
1253 void
1254 tdeletechar(int n)
1255 {
1256 int dst, src, size;
1257 Glyph *line;
1258
1259 LIMIT(n, 0, term.col - term.c.x);
1260
1261 dst = term.c.x;
1262 src = term.c.x + n;
1263 size = term.col - src;
1264 line = term.line[term.c.y];
1265
1266 memmove(&line[dst], &line[src], size * sizeof(Glyph));
1267 tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1268 }
1269
1270 void
1271 tinsertblank(int n)
1272 {
1273 int dst, src, size;
1274 Glyph *line;
1275
1276 LIMIT(n, 0, term.col - term.c.x);
1277
1278 dst = term.c.x + n;
1279 src = term.c.x;
1280 size = term.col - dst;
1281 line = term.line[term.c.y];
1282
1283 memmove(&line[dst], &line[src], size * sizeof(Glyph));
1284 tclearregion(src, term.c.y, dst - 1, term.c.y);
1285 }
1286
1287 void
1288 tinsertblankline(int n)
1289 {
1290 if (BETWEEN(term.c.y, term.top, term.bot))
1291 tscrolldown(term.c.y, n);
1292 }
1293
1294 void
1295 tdeleteline(int n)
1296 {
1297 if (BETWEEN(term.c.y, term.top, term.bot))
1298 tscrollup(term.c.y, n);
1299 }
1300
1301 int32_t
1302 tdefcolor(const int *attr, int *npar, int l)
1303 {
1304 int32_t idx = -1;
1305 uint r, g, b;
1306
1307 switch (attr[*npar + 1]) {
1308 case 2: /* direct color in RGB space */
1309 if (*npar + 4 >= l) {
1310 fprintf(stderr,
1311 "erresc(38): Incorrect number of paramet…
1312 *npar);
1313 break;
1314 }
1315 r = attr[*npar + 2];
1316 g = attr[*npar + 3];
1317 b = attr[*npar + 4];
1318 *npar += 4;
1319 if (!BETWEEN(r, 0, 255) || !BETWEEN(g, 0, 255) || !BETWE…
1320 fprintf(stderr, "erresc: bad rgb color (%u,%u,%u…
1321 r, g, b);
1322 else
1323 idx = TRUECOLOR(r, g, b);
1324 break;
1325 case 5: /* indexed color */
1326 if (*npar + 2 >= l) {
1327 fprintf(stderr,
1328 "erresc(38): Incorrect number of paramet…
1329 *npar);
1330 break;
1331 }
1332 *npar += 2;
1333 if (!BETWEEN(attr[*npar], 0, 255))
1334 fprintf(stderr, "erresc: bad fgcolor %d\n", attr…
1335 else
1336 idx = attr[*npar];
1337 break;
1338 case 0: /* implemented defined (only foreground) */
1339 case 1: /* transparent */
1340 case 3: /* direct color in CMY space */
1341 case 4: /* direct color in CMYK space */
1342 default:
1343 fprintf(stderr,
1344 "erresc(38): gfx attr %d unknown\n", attr[*npar]…
1345 break;
1346 }
1347
1348 return idx;
1349 }
1350
1351 void
1352 tsetattr(const int *attr, int l)
1353 {
1354 int i;
1355 int32_t idx;
1356
1357 for (i = 0; i < l; i++) {
1358 switch (attr[i]) {
1359 case 0:
1360 term.c.attr.mode &= ~(
1361 ATTR_BOLD |
1362 ATTR_FAINT |
1363 ATTR_ITALIC |
1364 ATTR_UNDERLINE |
1365 ATTR_BLINK |
1366 ATTR_REVERSE |
1367 ATTR_INVISIBLE |
1368 ATTR_STRUCK );
1369 term.c.attr.fg = defaultfg;
1370 term.c.attr.bg = defaultbg;
1371 break;
1372 case 1:
1373 term.c.attr.mode |= ATTR_BOLD;
1374 break;
1375 case 2:
1376 term.c.attr.mode |= ATTR_FAINT;
1377 break;
1378 case 3:
1379 term.c.attr.mode |= ATTR_ITALIC;
1380 break;
1381 case 4:
1382 term.c.attr.mode |= ATTR_UNDERLINE;
1383 break;
1384 case 5: /* slow blink */
1385 /* FALLTHROUGH */
1386 case 6: /* rapid blink */
1387 term.c.attr.mode |= ATTR_BLINK;
1388 break;
1389 case 7:
1390 term.c.attr.mode |= ATTR_REVERSE;
1391 break;
1392 case 8:
1393 term.c.attr.mode |= ATTR_INVISIBLE;
1394 break;
1395 case 9:
1396 term.c.attr.mode |= ATTR_STRUCK;
1397 break;
1398 case 22:
1399 term.c.attr.mode &= ~(ATTR_BOLD | ATTR_FAINT);
1400 break;
1401 case 23:
1402 term.c.attr.mode &= ~ATTR_ITALIC;
1403 break;
1404 case 24:
1405 term.c.attr.mode &= ~ATTR_UNDERLINE;
1406 break;
1407 case 25:
1408 term.c.attr.mode &= ~ATTR_BLINK;
1409 break;
1410 case 27:
1411 term.c.attr.mode &= ~ATTR_REVERSE;
1412 break;
1413 case 28:
1414 term.c.attr.mode &= ~ATTR_INVISIBLE;
1415 break;
1416 case 29:
1417 term.c.attr.mode &= ~ATTR_STRUCK;
1418 break;
1419 case 38:
1420 if ((idx = tdefcolor(attr, &i, l)) >= 0)
1421 term.c.attr.fg = idx;
1422 break;
1423 case 39: /* set foreground color to default */
1424 term.c.attr.fg = defaultfg;
1425 break;
1426 case 48:
1427 if ((idx = tdefcolor(attr, &i, l)) >= 0)
1428 term.c.attr.bg = idx;
1429 break;
1430 case 49: /* set background color to default */
1431 term.c.attr.bg = defaultbg;
1432 break;
1433 case 58:
1434 /* This starts a sequence to change the color of
1435 * "underline" pixels. We don't support that and
1436 * instead eat up a following "5;n" or "2;r;g;b"…
1437 tdefcolor(attr, &i, l);
1438 break;
1439 default:
1440 if (BETWEEN(attr[i], 30, 37)) {
1441 term.c.attr.fg = attr[i] - 30;
1442 } else if (BETWEEN(attr[i], 40, 47)) {
1443 term.c.attr.bg = attr[i] - 40;
1444 } else if (BETWEEN(attr[i], 90, 97)) {
1445 term.c.attr.fg = attr[i] - 90 + 8;
1446 } else if (BETWEEN(attr[i], 100, 107)) {
1447 term.c.attr.bg = attr[i] - 100 + 8;
1448 } else {
1449 fprintf(stderr,
1450 "erresc(default): gfx attr %d un…
1451 attr[i]);
1452 csidump();
1453 }
1454 break;
1455 }
1456 }
1457 }
1458
1459 void
1460 tsetscroll(int t, int b)
1461 {
1462 int temp;
1463
1464 LIMIT(t, 0, term.row-1);
1465 LIMIT(b, 0, term.row-1);
1466 if (t > b) {
1467 temp = t;
1468 t = b;
1469 b = temp;
1470 }
1471 term.top = t;
1472 term.bot = b;
1473 }
1474
1475 void
1476 tsetmode(int priv, int set, const int *args, int narg)
1477 {
1478 int alt; const int *lim;
1479
1480 for (lim = args + narg; args < lim; ++args) {
1481 if (priv) {
1482 switch (*args) {
1483 case 1: /* DECCKM -- Cursor key */
1484 xsetmode(set, MODE_APPCURSOR);
1485 break;
1486 case 5: /* DECSCNM -- Reverse video */
1487 xsetmode(set, MODE_REVERSE);
1488 break;
1489 case 6: /* DECOM -- Origin */
1490 MODBIT(term.c.state, set, CURSOR_ORIGIN);
1491 tmoveato(0, 0);
1492 break;
1493 case 7: /* DECAWM -- Auto wrap */
1494 MODBIT(term.mode, set, MODE_WRAP);
1495 break;
1496 case 0: /* Error (IGNORED) */
1497 case 2: /* DECANM -- ANSI/VT52 (IGNORED) */
1498 case 3: /* DECCOLM -- Column (IGNORED) */
1499 case 4: /* DECSCLM -- Scroll (IGNORED) */
1500 case 8: /* DECARM -- Auto repeat (IGNORED) */
1501 case 18: /* DECPFF -- Printer feed (IGNORED) */
1502 case 19: /* DECPEX -- Printer extent (IGNORED) */
1503 case 42: /* DECNRCM -- National characters (IGNO…
1504 case 12: /* att610 -- Start blinking cursor (IGN…
1505 break;
1506 case 25: /* DECTCEM -- Text Cursor Enable Mode */
1507 xsetmode(!set, MODE_HIDE);
1508 break;
1509 case 9: /* X10 mouse compatibility mode */
1510 xsetpointermotion(0);
1511 xsetmode(0, MODE_MOUSE);
1512 xsetmode(set, MODE_MOUSEX10);
1513 break;
1514 case 1000: /* 1000: report button press */
1515 xsetpointermotion(0);
1516 xsetmode(0, MODE_MOUSE);
1517 xsetmode(set, MODE_MOUSEBTN);
1518 break;
1519 case 1002: /* 1002: report motion on button pres…
1520 xsetpointermotion(0);
1521 xsetmode(0, MODE_MOUSE);
1522 xsetmode(set, MODE_MOUSEMOTION);
1523 break;
1524 case 1003: /* 1003: enable all mouse motions */
1525 xsetpointermotion(set);
1526 xsetmode(0, MODE_MOUSE);
1527 xsetmode(set, MODE_MOUSEMANY);
1528 break;
1529 case 1004: /* 1004: send focus events to tty */
1530 xsetmode(set, MODE_FOCUS);
1531 break;
1532 case 1006: /* 1006: extended reporting mode */
1533 xsetmode(set, MODE_MOUSESGR);
1534 break;
1535 case 1034: /* 1034: enable 8-bit mode for keyboa…
1536 xsetmode(set, MODE_8BIT);
1537 break;
1538 case 1049: /* swap screen & set/restore cursor a…
1539 if (!allowaltscreen)
1540 break;
1541 tcursor((set) ? CURSOR_SAVE : CURSOR_LOA…
1542 /* FALLTHROUGH */
1543 case 47: /* swap screen buffer */
1544 case 1047: /* swap screen buffer */
1545 if (!allowaltscreen)
1546 break;
1547 alt = IS_SET(MODE_ALTSCREEN);
1548 if (alt) {
1549 tclearregion(0, 0, term.col-1,
1550 term.row-1);
1551 }
1552 if (set ^ alt) /* set is always 1 or 0 */
1553 tswapscreen();
1554 if (*args != 1049)
1555 break;
1556 /* FALLTHROUGH */
1557 case 1048: /* save/restore cursor (like DECSC/DE…
1558 tcursor((set) ? CURSOR_SAVE : CURSOR_LOA…
1559 break;
1560 case 2004: /* 2004: bracketed paste mode */
1561 xsetmode(set, MODE_BRCKTPASTE);
1562 break;
1563 /* Not implemented mouse modes. See comments the…
1564 case 1001: /* mouse highlight mode; can hang the
1565 terminal by design when implemente…
1566 case 1005: /* UTF-8 mouse mode; will confuse
1567 applications not supporting UTF-8
1568 and luit. */
1569 case 1015: /* urxvt mangled mouse mode; incompat…
1570 and can be mistaken for other cont…
1571 codes. */
1572 break;
1573 default:
1574 fprintf(stderr,
1575 "erresc: unknown private set/res…
1576 *args);
1577 break;
1578 }
1579 } else {
1580 switch (*args) {
1581 case 0: /* Error (IGNORED) */
1582 break;
1583 case 2:
1584 xsetmode(set, MODE_KBDLOCK);
1585 break;
1586 case 4: /* IRM -- Insertion-replacement */
1587 MODBIT(term.mode, set, MODE_INSERT);
1588 break;
1589 case 12: /* SRM -- Send/Receive */
1590 MODBIT(term.mode, !set, MODE_ECHO);
1591 break;
1592 case 20: /* LNM -- Linefeed/new line */
1593 MODBIT(term.mode, set, MODE_CRLF);
1594 break;
1595 default:
1596 fprintf(stderr,
1597 "erresc: unknown set/reset mode …
1598 *args);
1599 break;
1600 }
1601 }
1602 }
1603 }
1604
1605 void
1606 csihandle(void)
1607 {
1608 char buf[40];
1609 int len;
1610
1611 switch (csiescseq.mode[0]) {
1612 default:
1613 unknown:
1614 fprintf(stderr, "erresc: unknown csi ");
1615 csidump();
1616 /* die(""); */
1617 break;
1618 case '@': /* ICH -- Insert <n> blank char */
1619 DEFAULT(csiescseq.arg[0], 1);
1620 tinsertblank(csiescseq.arg[0]);
1621 break;
1622 case 'A': /* CUU -- Cursor <n> Up */
1623 DEFAULT(csiescseq.arg[0], 1);
1624 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
1625 break;
1626 case 'B': /* CUD -- Cursor <n> Down */
1627 case 'e': /* VPR --Cursor <n> Down */
1628 DEFAULT(csiescseq.arg[0], 1);
1629 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
1630 break;
1631 case 'i': /* MC -- Media Copy */
1632 switch (csiescseq.arg[0]) {
1633 case 0:
1634 tdump();
1635 break;
1636 case 1:
1637 tdumpline(term.c.y);
1638 break;
1639 case 2:
1640 tdumpsel();
1641 break;
1642 case 4:
1643 term.mode &= ~MODE_PRINT;
1644 break;
1645 case 5:
1646 term.mode |= MODE_PRINT;
1647 break;
1648 }
1649 break;
1650 case 'c': /* DA -- Device Attributes */
1651 if (csiescseq.arg[0] == 0)
1652 ttywrite(vtiden, strlen(vtiden), 0);
1653 break;
1654 case 'b': /* REP -- if last char is printable print it <n> more …
1655 LIMIT(csiescseq.arg[0], 1, 65535);
1656 if (term.lastc)
1657 while (csiescseq.arg[0]-- > 0)
1658 tputc(term.lastc);
1659 break;
1660 case 'C': /* CUF -- Cursor <n> Forward */
1661 case 'a': /* HPR -- Cursor <n> Forward */
1662 DEFAULT(csiescseq.arg[0], 1);
1663 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
1664 break;
1665 case 'D': /* CUB -- Cursor <n> Backward */
1666 DEFAULT(csiescseq.arg[0], 1);
1667 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
1668 break;
1669 case 'E': /* CNL -- Cursor <n> Down and first col */
1670 DEFAULT(csiescseq.arg[0], 1);
1671 tmoveto(0, term.c.y+csiescseq.arg[0]);
1672 break;
1673 case 'F': /* CPL -- Cursor <n> Up and first col */
1674 DEFAULT(csiescseq.arg[0], 1);
1675 tmoveto(0, term.c.y-csiescseq.arg[0]);
1676 break;
1677 case 'g': /* TBC -- Tabulation clear */
1678 switch (csiescseq.arg[0]) {
1679 case 0: /* clear current tab stop */
1680 term.tabs[term.c.x] = 0;
1681 break;
1682 case 3: /* clear all the tabs */
1683 memset(term.tabs, 0, term.col * sizeof(*term.tab…
1684 break;
1685 default:
1686 goto unknown;
1687 }
1688 break;
1689 case 'G': /* CHA -- Move to <col> */
1690 case '`': /* HPA */
1691 DEFAULT(csiescseq.arg[0], 1);
1692 tmoveto(csiescseq.arg[0]-1, term.c.y);
1693 break;
1694 case 'H': /* CUP -- Move to <row> <col> */
1695 case 'f': /* HVP */
1696 DEFAULT(csiescseq.arg[0], 1);
1697 DEFAULT(csiescseq.arg[1], 1);
1698 tmoveato(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
1699 break;
1700 case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
1701 DEFAULT(csiescseq.arg[0], 1);
1702 tputtab(csiescseq.arg[0]);
1703 break;
1704 case 'J': /* ED -- Clear screen */
1705 switch (csiescseq.arg[0]) {
1706 case 0: /* below */
1707 tclearregion(term.c.x, term.c.y, term.col-1, ter…
1708 if (term.c.y < term.row-1) {
1709 tclearregion(0, term.c.y+1, term.col-1,
1710 term.row-1);
1711 }
1712 break;
1713 case 1: /* above */
1714 if (term.c.y > 0)
1715 tclearregion(0, 0, term.col-1, term.c.y-…
1716 tclearregion(0, term.c.y, term.c.x, term.c.y);
1717 break;
1718 case 2: /* all */
1719 tclearregion(0, 0, term.col-1, term.row-1);
1720 break;
1721 default:
1722 goto unknown;
1723 }
1724 break;
1725 case 'K': /* EL -- Clear line */
1726 switch (csiescseq.arg[0]) {
1727 case 0: /* right */
1728 tclearregion(term.c.x, term.c.y, term.col-1,
1729 term.c.y);
1730 break;
1731 case 1: /* left */
1732 tclearregion(0, term.c.y, term.c.x, term.c.y);
1733 break;
1734 case 2: /* all */
1735 tclearregion(0, term.c.y, term.col-1, term.c.y);
1736 break;
1737 }
1738 break;
1739 case 'S': /* SU -- Scroll <n> line up */
1740 if (csiescseq.priv) break;
1741 DEFAULT(csiescseq.arg[0], 1);
1742 tscrollup(term.top, csiescseq.arg[0]);
1743 break;
1744 case 'T': /* SD -- Scroll <n> line down */
1745 DEFAULT(csiescseq.arg[0], 1);
1746 tscrolldown(term.top, csiescseq.arg[0]);
1747 break;
1748 case 'L': /* IL -- Insert <n> blank lines */
1749 DEFAULT(csiescseq.arg[0], 1);
1750 tinsertblankline(csiescseq.arg[0]);
1751 break;
1752 case 'l': /* RM -- Reset Mode */
1753 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.nar…
1754 break;
1755 case 'M': /* DL -- Delete <n> lines */
1756 DEFAULT(csiescseq.arg[0], 1);
1757 tdeleteline(csiescseq.arg[0]);
1758 break;
1759 case 'X': /* ECH -- Erase <n> char */
1760 DEFAULT(csiescseq.arg[0], 1);
1761 tclearregion(term.c.x, term.c.y,
1762 term.c.x + csiescseq.arg[0] - 1, term.c.…
1763 break;
1764 case 'P': /* DCH -- Delete <n> char */
1765 DEFAULT(csiescseq.arg[0], 1);
1766 tdeletechar(csiescseq.arg[0]);
1767 break;
1768 case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
1769 DEFAULT(csiescseq.arg[0], 1);
1770 tputtab(-csiescseq.arg[0]);
1771 break;
1772 case 'd': /* VPA -- Move to <row> */
1773 DEFAULT(csiescseq.arg[0], 1);
1774 tmoveato(term.c.x, csiescseq.arg[0]-1);
1775 break;
1776 case 'h': /* SM -- Set terminal mode */
1777 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.nar…
1778 break;
1779 case 'm': /* SGR -- Terminal attribute (color) */
1780 tsetattr(csiescseq.arg, csiescseq.narg);
1781 break;
1782 case 'n': /* DSR -- Device Status Report */
1783 switch (csiescseq.arg[0]) {
1784 case 5: /* Status Report "OK" `0n` */
1785 ttywrite("\033[0n", sizeof("\033[0n") - 1, 0);
1786 break;
1787 case 6: /* Report Cursor Position (CPR) "<row>;<column>R…
1788 len = snprintf(buf, sizeof(buf), "\033[%i;%iR",
1789 term.c.y+1, term.c.x+1);
1790 ttywrite(buf, len, 0);
1791 break;
1792 default:
1793 goto unknown;
1794 }
1795 break;
1796 case 'r': /* DECSTBM -- Set Scrolling Region */
1797 if (csiescseq.priv) {
1798 goto unknown;
1799 } else {
1800 DEFAULT(csiescseq.arg[0], 1);
1801 DEFAULT(csiescseq.arg[1], term.row);
1802 tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-…
1803 tmoveato(0, 0);
1804 }
1805 break;
1806 case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
1807 tcursor(CURSOR_SAVE);
1808 break;
1809 case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
1810 if (csiescseq.priv) {
1811 goto unknown;
1812 } else {
1813 tcursor(CURSOR_LOAD);
1814 }
1815 break;
1816 case ' ':
1817 switch (csiescseq.mode[1]) {
1818 case 'q': /* DECSCUSR -- Set Cursor Style */
1819 if (xsetcursor(csiescseq.arg[0]))
1820 goto unknown;
1821 break;
1822 default:
1823 goto unknown;
1824 }
1825 break;
1826 }
1827 }
1828
1829 void
1830 csidump(void)
1831 {
1832 size_t i;
1833 uint c;
1834
1835 fprintf(stderr, "ESC[");
1836 for (i = 0; i < csiescseq.len; i++) {
1837 c = csiescseq.buf[i] & 0xff;
1838 if (isprint(c)) {
1839 putc(c, stderr);
1840 } else if (c == '\n') {
1841 fprintf(stderr, "(\\n)");
1842 } else if (c == '\r') {
1843 fprintf(stderr, "(\\r)");
1844 } else if (c == 0x1b) {
1845 fprintf(stderr, "(\\e)");
1846 } else {
1847 fprintf(stderr, "(%02x)", c);
1848 }
1849 }
1850 putc('\n', stderr);
1851 }
1852
1853 void
1854 csireset(void)
1855 {
1856 memset(&csiescseq, 0, sizeof(csiescseq));
1857 }
1858
1859 void
1860 osc_color_response(int num, int index, int is_osc4)
1861 {
1862 int n;
1863 char buf[32];
1864 unsigned char r, g, b;
1865
1866 if (xgetcolor(is_osc4 ? num : index, &r, &g, &b)) {
1867 fprintf(stderr, "erresc: failed to fetch %s color %d\n",
1868 is_osc4 ? "osc4" : "osc",
1869 is_osc4 ? num : index);
1870 return;
1871 }
1872
1873 n = snprintf(buf, sizeof buf, "\033]%s%d;rgb:%02x%02x/%02x%02x/%…
1874 is_osc4 ? "4;" : "", num, r, r, g, g, b, b);
1875 if (n < 0 || n >= sizeof(buf)) {
1876 fprintf(stderr, "error: %s while printing %s response\n",
1877 n < 0 ? "snprintf failed" : "truncation occurred…
1878 is_osc4 ? "osc4" : "osc");
1879 } else {
1880 ttywrite(buf, n, 1);
1881 }
1882 }
1883
1884 void
1885 strhandle(void)
1886 {
1887 char *p = NULL, *dec;
1888 int j, narg, par;
1889 const struct { int idx; char *str; } osc_table[] = {
1890 { defaultfg, "foreground" },
1891 { defaultbg, "background" },
1892 { defaultcs, "cursor" }
1893 };
1894
1895 term.esc &= ~(ESC_STR_END|ESC_STR);
1896 strparse();
1897 par = (narg = strescseq.narg) ? atoi(strescseq.args[0]) : 0;
1898
1899 switch (strescseq.type) {
1900 case ']': /* OSC -- Operating System Command */
1901 switch (par) {
1902 case 0:
1903 if (narg > 1) {
1904 xsettitle(strescseq.args[1]);
1905 xseticontitle(strescseq.args[1]);
1906 }
1907 return;
1908 case 1:
1909 if (narg > 1)
1910 xseticontitle(strescseq.args[1]);
1911 return;
1912 case 2:
1913 if (narg > 1)
1914 xsettitle(strescseq.args[1]);
1915 return;
1916 case 52: /* manipulate selection data */
1917 if (narg > 2 && allowwindowops) {
1918 dec = base64dec(strescseq.args[2]);
1919 if (dec) {
1920 xsetsel(dec);
1921 xclipcopy();
1922 } else {
1923 fprintf(stderr, "erresc: invalid…
1924 }
1925 }
1926 return;
1927 case 10: /* set dynamic VT100 text foreground color */
1928 case 11: /* set dynamic VT100 text background color */
1929 case 12: /* set dynamic text cursor color */
1930 if (narg < 2)
1931 break;
1932 p = strescseq.args[1];
1933 if ((j = par - 10) < 0 || j >= LEN(osc_table))
1934 break; /* shouldn't be possible */
1935
1936 if (!strcmp(p, "?")) {
1937 osc_color_response(par, osc_table[j].idx…
1938 } else if (xsetcolorname(osc_table[j].idx, p)) {
1939 fprintf(stderr, "erresc: invalid %s colo…
1940 osc_table[j].str, p);
1941 } else {
1942 tfulldirt();
1943 }
1944 return;
1945 case 4: /* color set */
1946 if (narg < 3)
1947 break;
1948 p = strescseq.args[2];
1949 /* FALLTHROUGH */
1950 case 104: /* color reset */
1951 j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
1952
1953 if (p && !strcmp(p, "?")) {
1954 osc_color_response(j, 0, 1);
1955 } else if (xsetcolorname(j, p)) {
1956 if (par == 104 && narg <= 1) {
1957 xloadcols();
1958 return; /* color reset without p…
1959 }
1960 fprintf(stderr, "erresc: invalid color j…
1961 j, p ? p : "(null)");
1962 } else {
1963 /*
1964 * TODO if defaultbg color is changed, b…
1965 * are dirty
1966 */
1967 tfulldirt();
1968 }
1969 return;
1970 case 110: /* reset dynamic VT100 text foreground color */
1971 case 111: /* reset dynamic VT100 text background color */
1972 case 112: /* reset dynamic text cursor color */
1973 if (narg != 1)
1974 break;
1975 if ((j = par - 110) < 0 || j >= LEN(osc_table))
1976 break; /* shouldn't be possible */
1977 if (xsetcolorname(osc_table[j].idx, NULL)) {
1978 fprintf(stderr, "erresc: %s color not fo…
1979 } else {
1980 tfulldirt();
1981 }
1982 return;
1983 }
1984 break;
1985 case 'k': /* old title set compatibility */
1986 xsettitle(strescseq.args[0]);
1987 return;
1988 case 'P': /* DCS -- Device Control String */
1989 case '_': /* APC -- Application Program Command */
1990 case '^': /* PM -- Privacy Message */
1991 return;
1992 }
1993
1994 fprintf(stderr, "erresc: unknown str ");
1995 strdump();
1996 }
1997
1998 void
1999 strparse(void)
2000 {
2001 int c;
2002 char *p = strescseq.buf;
2003
2004 strescseq.narg = 0;
2005 strescseq.buf[strescseq.len] = '\0';
2006
2007 if (*p == '\0')
2008 return;
2009
2010 while (strescseq.narg < STR_ARG_SIZ) {
2011 strescseq.args[strescseq.narg++] = p;
2012 while ((c = *p) != ';' && c != '\0')
2013 ++p;
2014 if (c == '\0')
2015 return;
2016 *p++ = '\0';
2017 }
2018 }
2019
2020 void
2021 strdump(void)
2022 {
2023 size_t i;
2024 uint c;
2025
2026 fprintf(stderr, "ESC%c", strescseq.type);
2027 for (i = 0; i < strescseq.len; i++) {
2028 c = strescseq.buf[i] & 0xff;
2029 if (c == '\0') {
2030 putc('\n', stderr);
2031 return;
2032 } else if (isprint(c)) {
2033 putc(c, stderr);
2034 } else if (c == '\n') {
2035 fprintf(stderr, "(\\n)");
2036 } else if (c == '\r') {
2037 fprintf(stderr, "(\\r)");
2038 } else if (c == 0x1b) {
2039 fprintf(stderr, "(\\e)");
2040 } else {
2041 fprintf(stderr, "(%02x)", c);
2042 }
2043 }
2044 fprintf(stderr, "ESC\\\n");
2045 }
2046
2047 void
2048 strreset(void)
2049 {
2050 strescseq = (STREscape){
2051 .buf = xrealloc(strescseq.buf, STR_BUF_SIZ),
2052 .siz = STR_BUF_SIZ,
2053 };
2054 }
2055
2056 void
2057 sendbreak(const Arg *arg)
2058 {
2059 if (tcsendbreak(cmdfd, 0))
2060 perror("Error sending break");
2061 }
2062
2063 void
2064 tprinter(char *s, size_t len)
2065 {
2066 if (iofd != -1 && xwrite(iofd, s, len) < 0) {
2067 perror("Error writing to output file");
2068 close(iofd);
2069 iofd = -1;
2070 }
2071 }
2072
2073 void
2074 toggleprinter(const Arg *arg)
2075 {
2076 term.mode ^= MODE_PRINT;
2077 }
2078
2079 void
2080 printscreen(const Arg *arg)
2081 {
2082 tdump();
2083 }
2084
2085 void
2086 printsel(const Arg *arg)
2087 {
2088 tdumpsel();
2089 }
2090
2091 void
2092 tdumpsel(void)
2093 {
2094 char *ptr;
2095
2096 if ((ptr = getsel())) {
2097 tprinter(ptr, strlen(ptr));
2098 free(ptr);
2099 }
2100 }
2101
2102 void
2103 tdumpline(int n)
2104 {
2105 char buf[UTF_SIZ];
2106 const Glyph *bp, *end;
2107
2108 bp = &term.line[n][0];
2109 end = &bp[MIN(tlinelen(n), term.col) - 1];
2110 if (bp != end || bp->u != ' ') {
2111 for ( ; bp <= end; ++bp)
2112 tprinter(buf, utf8encode(bp->u, buf));
2113 }
2114 tprinter("\n", 1);
2115 }
2116
2117 void
2118 tdump(void)
2119 {
2120 int i;
2121
2122 for (i = 0; i < term.row; ++i)
2123 tdumpline(i);
2124 }
2125
2126 void
2127 tputtab(int n)
2128 {
2129 uint x = term.c.x;
2130
2131 if (n > 0) {
2132 while (x < term.col && n--)
2133 for (++x; x < term.col && !term.tabs[x]; ++x)
2134 /* nothing */ ;
2135 } else if (n < 0) {
2136 while (x > 0 && n++)
2137 for (--x; x > 0 && !term.tabs[x]; --x)
2138 /* nothing */ ;
2139 }
2140 term.c.x = LIMIT(x, 0, term.col-1);
2141 }
2142
2143 void
2144 tdefutf8(char ascii)
2145 {
2146 if (ascii == 'G')
2147 term.mode |= MODE_UTF8;
2148 else if (ascii == '@')
2149 term.mode &= ~MODE_UTF8;
2150 }
2151
2152 void
2153 tdeftran(char ascii)
2154 {
2155 static char cs[] = "0B";
2156 static int vcs[] = {CS_GRAPHIC0, CS_USA};
2157 char *p;
2158
2159 if ((p = strchr(cs, ascii)) == NULL) {
2160 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", asc…
2161 } else {
2162 term.trantbl[term.icharset] = vcs[p - cs];
2163 }
2164 }
2165
2166 void
2167 tdectest(char c)
2168 {
2169 int x, y;
2170
2171 if (c == '8') { /* DEC screen alignment test. */
2172 for (x = 0; x < term.col; ++x) {
2173 for (y = 0; y < term.row; ++y)
2174 tsetchar('E', &term.c.attr, x, y);
2175 }
2176 }
2177 }
2178
2179 void
2180 tstrsequence(uchar c)
2181 {
2182 switch (c) {
2183 case 0x90: /* DCS -- Device Control String */
2184 c = 'P';
2185 break;
2186 case 0x9f: /* APC -- Application Program Command */
2187 c = '_';
2188 break;
2189 case 0x9e: /* PM -- Privacy Message */
2190 c = '^';
2191 break;
2192 case 0x9d: /* OSC -- Operating System Command */
2193 c = ']';
2194 break;
2195 }
2196 strreset();
2197 strescseq.type = c;
2198 term.esc |= ESC_STR;
2199 }
2200
2201 void
2202 tcontrolcode(uchar ascii)
2203 {
2204 switch (ascii) {
2205 case '\t': /* HT */
2206 tputtab(1);
2207 return;
2208 case '\b': /* BS */
2209 tmoveto(term.c.x-1, term.c.y);
2210 return;
2211 case '\r': /* CR */
2212 tmoveto(0, term.c.y);
2213 return;
2214 case '\f': /* LF */
2215 case '\v': /* VT */
2216 case '\n': /* LF */
2217 /* go to first col if the mode is set */
2218 tnewline(IS_SET(MODE_CRLF));
2219 return;
2220 case '\a': /* BEL */
2221 if (term.esc & ESC_STR_END) {
2222 /* backwards compatibility to xterm */
2223 strhandle();
2224 } else {
2225 xbell();
2226 }
2227 break;
2228 case '\033': /* ESC */
2229 csireset();
2230 term.esc &= ~(ESC_CSI|ESC_ALTCHARSET|ESC_TEST);
2231 term.esc |= ESC_START;
2232 return;
2233 case '\016': /* SO (LS1 -- Locking shift 1) */
2234 case '\017': /* SI (LS0 -- Locking shift 0) */
2235 term.charset = 1 - (ascii - '\016');
2236 return;
2237 case '\032': /* SUB */
2238 tsetchar('?', &term.c.attr, term.c.x, term.c.y);
2239 /* FALLTHROUGH */
2240 case '\030': /* CAN */
2241 csireset();
2242 break;
2243 case '\005': /* ENQ (IGNORED) */
2244 case '\000': /* NUL (IGNORED) */
2245 case '\021': /* XON (IGNORED) */
2246 case '\023': /* XOFF (IGNORED) */
2247 case 0177: /* DEL (IGNORED) */
2248 return;
2249 case 0x80: /* TODO: PAD */
2250 case 0x81: /* TODO: HOP */
2251 case 0x82: /* TODO: BPH */
2252 case 0x83: /* TODO: NBH */
2253 case 0x84: /* TODO: IND */
2254 break;
2255 case 0x85: /* NEL -- Next line */
2256 tnewline(1); /* always go to first col */
2257 break;
2258 case 0x86: /* TODO: SSA */
2259 case 0x87: /* TODO: ESA */
2260 break;
2261 case 0x88: /* HTS -- Horizontal tab stop */
2262 term.tabs[term.c.x] = 1;
2263 break;
2264 case 0x89: /* TODO: HTJ */
2265 case 0x8a: /* TODO: VTS */
2266 case 0x8b: /* TODO: PLD */
2267 case 0x8c: /* TODO: PLU */
2268 case 0x8d: /* TODO: RI */
2269 case 0x8e: /* TODO: SS2 */
2270 case 0x8f: /* TODO: SS3 */
2271 case 0x91: /* TODO: PU1 */
2272 case 0x92: /* TODO: PU2 */
2273 case 0x93: /* TODO: STS */
2274 case 0x94: /* TODO: CCH */
2275 case 0x95: /* TODO: MW */
2276 case 0x96: /* TODO: SPA */
2277 case 0x97: /* TODO: EPA */
2278 case 0x98: /* TODO: SOS */
2279 case 0x99: /* TODO: SGCI */
2280 break;
2281 case 0x9a: /* DECID -- Identify Terminal */
2282 ttywrite(vtiden, strlen(vtiden), 0);
2283 break;
2284 case 0x9b: /* TODO: CSI */
2285 case 0x9c: /* TODO: ST */
2286 break;
2287 case 0x90: /* DCS -- Device Control String */
2288 case 0x9d: /* OSC -- Operating System Command */
2289 case 0x9e: /* PM -- Privacy Message */
2290 case 0x9f: /* APC -- Application Program Command */
2291 tstrsequence(ascii);
2292 return;
2293 }
2294 /* only CAN, SUB, \a and C1 chars interrupt a sequence */
2295 term.esc &= ~(ESC_STR_END|ESC_STR);
2296 }
2297
2298 /*
2299 * returns 1 when the sequence is finished and it hasn't to read
2300 * more characters for this sequence, otherwise 0
2301 */
2302 int
2303 eschandle(uchar ascii)
2304 {
2305 switch (ascii) {
2306 case '[':
2307 term.esc |= ESC_CSI;
2308 return 0;
2309 case '#':
2310 term.esc |= ESC_TEST;
2311 return 0;
2312 case '%':
2313 term.esc |= ESC_UTF8;
2314 return 0;
2315 case 'P': /* DCS -- Device Control String */
2316 case '_': /* APC -- Application Program Command */
2317 case '^': /* PM -- Privacy Message */
2318 case ']': /* OSC -- Operating System Command */
2319 case 'k': /* old title set compatibility */
2320 tstrsequence(ascii);
2321 return 0;
2322 case 'n': /* LS2 -- Locking shift 2 */
2323 case 'o': /* LS3 -- Locking shift 3 */
2324 term.charset = 2 + (ascii - 'n');
2325 break;
2326 case '(': /* GZD4 -- set primary charset G0 */
2327 case ')': /* G1D4 -- set secondary charset G1 */
2328 case '*': /* G2D4 -- set tertiary charset G2 */
2329 case '+': /* G3D4 -- set quaternary charset G3 */
2330 term.icharset = ascii - '(';
2331 term.esc |= ESC_ALTCHARSET;
2332 return 0;
2333 case 'D': /* IND -- Linefeed */
2334 if (term.c.y == term.bot) {
2335 tscrollup(term.top, 1);
2336 } else {
2337 tmoveto(term.c.x, term.c.y+1);
2338 }
2339 break;
2340 case 'E': /* NEL -- Next line */
2341 tnewline(1); /* always go to first col */
2342 break;
2343 case 'H': /* HTS -- Horizontal tab stop */
2344 term.tabs[term.c.x] = 1;
2345 break;
2346 case 'M': /* RI -- Reverse index */
2347 if (term.c.y == term.top) {
2348 tscrolldown(term.top, 1);
2349 } else {
2350 tmoveto(term.c.x, term.c.y-1);
2351 }
2352 break;
2353 case 'Z': /* DECID -- Identify Terminal */
2354 ttywrite(vtiden, strlen(vtiden), 0);
2355 break;
2356 case 'c': /* RIS -- Reset to initial state */
2357 treset();
2358 resettitle();
2359 xloadcols();
2360 xsetmode(0, MODE_HIDE);
2361 xsetmode(0, MODE_BRCKTPASTE);
2362 break;
2363 case '=': /* DECPAM -- Application keypad */
2364 xsetmode(1, MODE_APPKEYPAD);
2365 break;
2366 case '>': /* DECPNM -- Normal keypad */
2367 xsetmode(0, MODE_APPKEYPAD);
2368 break;
2369 case '7': /* DECSC -- Save Cursor */
2370 tcursor(CURSOR_SAVE);
2371 break;
2372 case '8': /* DECRC -- Restore Cursor */
2373 tcursor(CURSOR_LOAD);
2374 break;
2375 case '\\': /* ST -- String Terminator */
2376 if (term.esc & ESC_STR_END)
2377 strhandle();
2378 break;
2379 default:
2380 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c…
2381 (uchar) ascii, isprint(ascii)? ascii:'.');
2382 break;
2383 }
2384 return 1;
2385 }
2386
2387 void
2388 tputc(Rune u)
2389 {
2390 char c[UTF_SIZ];
2391 int control;
2392 int width, len;
2393 Glyph *gp;
2394
2395 control = ISCONTROL(u);
2396 if (u < 127 || !IS_SET(MODE_UTF8)) {
2397 c[0] = u;
2398 width = len = 1;
2399 } else {
2400 len = utf8encode(u, c);
2401 if (!control && (width = wcwidth(u)) == -1)
2402 width = 1;
2403 }
2404
2405 if (IS_SET(MODE_PRINT))
2406 tprinter(c, len);
2407
2408 /*
2409 * STR sequence must be checked before anything else
2410 * because it uses all following characters until it
2411 * receives a ESC, a SUB, a ST or any other C1 control
2412 * character.
2413 */
2414 if (term.esc & ESC_STR) {
2415 if (u == '\a' || u == 030 || u == 032 || u == 033 ||
2416 ISCONTROLC1(u)) {
2417 term.esc &= ~(ESC_START|ESC_STR);
2418 term.esc |= ESC_STR_END;
2419 goto check_control_code;
2420 }
2421
2422 if (strescseq.len+len >= strescseq.siz) {
2423 /*
2424 * Here is a bug in terminals. If the user never…
2425 * some code to stop the str or esc command, the…
2426 * will stop responding. But this is better than
2427 * silently failing with unknown characters. At …
2428 * then users will report back.
2429 *
2430 * In the case users ever get fixed, here is the…
2431 */
2432 /*
2433 * term.esc = 0;
2434 * strhandle();
2435 */
2436 if (strescseq.siz > (SIZE_MAX - UTF_SIZ) / 2)
2437 return;
2438 strescseq.siz *= 2;
2439 strescseq.buf = xrealloc(strescseq.buf, strescse…
2440 }
2441
2442 memmove(&strescseq.buf[strescseq.len], c, len);
2443 strescseq.len += len;
2444 return;
2445 }
2446
2447 check_control_code:
2448 /*
2449 * Actions of control codes must be performed as soon they arrive
2450 * because they can be embedded inside a control sequence, and
2451 * they must not cause conflicts with sequences.
2452 */
2453 if (control) {
2454 /* in UTF-8 mode ignore handling C1 control characters */
2455 if (IS_SET(MODE_UTF8) && ISCONTROLC1(u))
2456 return;
2457 tcontrolcode(u);
2458 /*
2459 * control codes are not shown ever
2460 */
2461 if (!term.esc)
2462 term.lastc = 0;
2463 return;
2464 } else if (term.esc & ESC_START) {
2465 if (term.esc & ESC_CSI) {
2466 csiescseq.buf[csiescseq.len++] = u;
2467 if (BETWEEN(u, 0x40, 0x7E)
2468 || csiescseq.len >= \
2469 sizeof(csiescseq.buf)-1) {
2470 term.esc = 0;
2471 csiparse();
2472 csihandle();
2473 }
2474 return;
2475 } else if (term.esc & ESC_UTF8) {
2476 tdefutf8(u);
2477 } else if (term.esc & ESC_ALTCHARSET) {
2478 tdeftran(u);
2479 } else if (term.esc & ESC_TEST) {
2480 tdectest(u);
2481 } else {
2482 if (!eschandle(u))
2483 return;
2484 /* sequence already finished */
2485 }
2486 term.esc = 0;
2487 /*
2488 * All characters which form part of a sequence are not
2489 * printed
2490 */
2491 return;
2492 }
2493 if (selected(term.c.x, term.c.y))
2494 selclear();
2495
2496 gp = &term.line[term.c.y][term.c.x];
2497 if (IS_SET(MODE_WRAP) && (term.c.state & CURSOR_WRAPNEXT)) {
2498 gp->mode |= ATTR_WRAP;
2499 tnewline(1);
2500 gp = &term.line[term.c.y][term.c.x];
2501 }
2502
2503 if (IS_SET(MODE_INSERT) && term.c.x+width < term.col) {
2504 memmove(gp+width, gp, (term.col - term.c.x - width) * si…
2505 gp->mode &= ~ATTR_WIDE;
2506 }
2507
2508 if (term.c.x+width > term.col) {
2509 if (IS_SET(MODE_WRAP))
2510 tnewline(1);
2511 else
2512 tmoveto(term.col - width, term.c.y);
2513 gp = &term.line[term.c.y][term.c.x];
2514 }
2515
2516 tsetchar(u, &term.c.attr, term.c.x, term.c.y);
2517 term.lastc = u;
2518
2519 if (width == 2) {
2520 gp->mode |= ATTR_WIDE;
2521 if (term.c.x+1 < term.col) {
2522 if (gp[1].mode == ATTR_WIDE && term.c.x+2 < term…
2523 gp[2].u = ' ';
2524 gp[2].mode &= ~ATTR_WDUMMY;
2525 }
2526 gp[1].u = '\0';
2527 gp[1].mode = ATTR_WDUMMY;
2528 }
2529 }
2530 if (term.c.x+width < term.col) {
2531 tmoveto(term.c.x+width, term.c.y);
2532 } else {
2533 term.c.state |= CURSOR_WRAPNEXT;
2534 }
2535 }
2536
2537 int
2538 twrite(const char *buf, int buflen, int show_ctrl)
2539 {
2540 int charsize;
2541 Rune u;
2542 int n;
2543
2544 for (n = 0; n < buflen; n += charsize) {
2545 if (IS_SET(MODE_UTF8)) {
2546 /* process a complete utf8 char */
2547 charsize = utf8decode(buf + n, &u, buflen - n);
2548 if (charsize == 0)
2549 break;
2550 } else {
2551 u = buf[n] & 0xFF;
2552 charsize = 1;
2553 }
2554 if (show_ctrl && ISCONTROL(u)) {
2555 if (u & 0x80) {
2556 u &= 0x7f;
2557 tputc('^');
2558 tputc('[');
2559 } else if (u != '\n' && u != '\r' && u != '\t') {
2560 u ^= 0x40;
2561 tputc('^');
2562 }
2563 }
2564 tputc(u);
2565 }
2566 return n;
2567 }
2568
2569 void
2570 tresize(int col, int row)
2571 {
2572 int i;
2573 int minrow = MIN(row, term.row);
2574 int mincol = MIN(col, term.col);
2575 int *bp;
2576 TCursor c;
2577
2578 if (col < 1 || row < 1) {
2579 fprintf(stderr,
2580 "tresize: error resizing to %dx%d\n", col, row);
2581 return;
2582 }
2583
2584 /*
2585 * slide screen to keep cursor where we expect it -
2586 * tscrollup would work here, but we can optimize to
2587 * memmove because we're freeing the earlier lines
2588 */
2589 for (i = 0; i <= term.c.y - row; i++) {
2590 free(term.line[i]);
2591 free(term.alt[i]);
2592 }
2593 /* ensure that both src and dst are not NULL */
2594 if (i > 0) {
2595 memmove(term.line, term.line + i, row * sizeof(Line));
2596 memmove(term.alt, term.alt + i, row * sizeof(Line));
2597 }
2598 for (i += row; i < term.row; i++) {
2599 free(term.line[i]);
2600 free(term.alt[i]);
2601 }
2602
2603 /* resize to new height */
2604 term.line = xrealloc(term.line, row * sizeof(Line));
2605 term.alt = xrealloc(term.alt, row * sizeof(Line));
2606 term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
2607 term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
2608
2609 /* resize each row to new width, zero-pad if needed */
2610 for (i = 0; i < minrow; i++) {
2611 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph…
2612 term.alt[i] = xrealloc(term.alt[i], col * sizeof(Glyph…
2613 }
2614
2615 /* allocate any new rows */
2616 for (/* i = minrow */; i < row; i++) {
2617 term.line[i] = xmalloc(col * sizeof(Glyph));
2618 term.alt[i] = xmalloc(col * sizeof(Glyph));
2619 }
2620 if (col > term.col) {
2621 bp = term.tabs + term.col;
2622
2623 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
2624 while (--bp > term.tabs && !*bp)
2625 /* nothing */ ;
2626 for (bp += tabspaces; bp < term.tabs + col; bp += tabspa…
2627 *bp = 1;
2628 }
2629 /* update terminal size */
2630 term.col = col;
2631 term.row = row;
2632 /* reset scrolling region */
2633 tsetscroll(0, row-1);
2634 /* make use of the LIMIT in tmoveto */
2635 tmoveto(term.c.x, term.c.y);
2636 /* Clearing both screens (it makes dirty all lines) */
2637 c = term.c;
2638 for (i = 0; i < 2; i++) {
2639 if (mincol < col && 0 < minrow) {
2640 tclearregion(mincol, 0, col - 1, minrow - 1);
2641 }
2642 if (0 < col && minrow < row) {
2643 tclearregion(0, minrow, col - 1, row - 1);
2644 }
2645 tswapscreen();
2646 tcursor(CURSOR_LOAD);
2647 }
2648 term.c = c;
2649 }
2650
2651 void
2652 resettitle(void)
2653 {
2654 xsettitle(NULL);
2655 }
2656
2657 void
2658 drawregion(int x1, int y1, int x2, int y2)
2659 {
2660 int y;
2661
2662 for (y = y1; y < y2; y++) {
2663 if (!term.dirty[y])
2664 continue;
2665
2666 term.dirty[y] = 0;
2667 xdrawline(term.line[y], x1, y, x2);
2668 }
2669 }
2670
2671 void
2672 draw(void)
2673 {
2674 int cx = term.c.x, ocx = term.ocx, ocy = term.ocy;
2675
2676 if (!xstartdraw())
2677 return;
2678
2679 /* adjust cursor position */
2680 LIMIT(term.ocx, 0, term.col-1);
2681 LIMIT(term.ocy, 0, term.row-1);
2682 if (term.line[term.ocy][term.ocx].mode & ATTR_WDUMMY)
2683 term.ocx--;
2684 if (term.line[term.c.y][cx].mode & ATTR_WDUMMY)
2685 cx--;
2686
2687 drawregion(0, 0, term.col, term.row);
2688 xdrawcursor(cx, term.c.y, term.line[term.c.y][cx],
2689 term.ocx, term.ocy, term.line[term.ocy][term.ocx…
2690 term.ocx = cx;
2691 term.ocy = term.c.y;
2692 xfinishdraw();
2693 if (ocx != term.ocx || ocy != term.ocy)
2694 xximspot(term.ocx, term.ocy);
2695 }
2696
2697 void
2698 redraw(void)
2699 {
2700 tfulldirt();
2701 draw();
2702 }
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