st.c - st - simple terminal
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st.c (57204B)
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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) == 0x7f)
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 selection
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 control */
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, 0x10000};
233 static const Rune utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
234
235 int
236 subprocwd(char *path)
237 {
238 if (snprintf(path, PATH_MAX, "/proc/%d/cwd", pid) < 0)
239 return -1;
240
241 return 0;
242 }
243
244 ssize_t
245 xwrite(int fd, const char *s, size_t len)
246 {
247 size_t aux = len;
248 ssize_t r;
249
250 while (len > 0) {
251 r = write(fd, s, len);
252 if (r < 0)
253 return r;
254 len -= r;
255 s += r;
256 }
257
258 return aux;
259 }
260
261 void *
262 xmalloc(size_t len)
263 {
264 void *p;
265
266 if (!(p = malloc(len)))
267 die("malloc: %s\n", strerror(errno));
268
269 return p;
270 }
271
272 void *
273 xrealloc(void *p, size_t len)
274 {
275 if ((p = realloc(p, len)) == NULL)
276 die("realloc: %s\n", strerror(errno));
277
278 return p;
279 }
280
281 char *
282 xstrdup(const char *s)
283 {
284 char *p;
285
286 if ((p = strdup(s)) == NULL)
287 die("strdup: %s\n", strerror(errno));
288
289 return p;
290 }
291
292 size_t
293 utf8decode(const char *c, Rune *u, size_t clen)
294 {
295 size_t i, j, len, type;
296 Rune udecoded;
297
298 *u = UTF_INVALID;
299 if (!clen)
300 return 0;
301 udecoded = utf8decodebyte(c[0], &len);
302 if (!BETWEEN(len, 1, UTF_SIZ))
303 return 1;
304 for (i = 1, j = 1; i < clen && j < len; ++i, ++j) {
305 udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
306 if (type != 0)
307 return j;
308 }
309 if (j < len)
310 return 0;
311 *u = udecoded;
312 utf8validate(u, len);
313
314 return len;
315 }
316
317 Rune
318 utf8decodebyte(char c, size_t *i)
319 {
320 for (*i = 0; *i < LEN(utfmask); ++(*i))
321 if (((uchar)c & utfmask[*i]) == utfbyte[*i])
322 return (uchar)c & ~utfmask[*i];
323
324 return 0;
325 }
326
327 size_t
328 utf8encode(Rune u, char *c)
329 {
330 size_t len, i;
331
332 len = utf8validate(&u, 0);
333 if (len > UTF_SIZ)
334 return 0;
335
336 for (i = len - 1; i != 0; --i) {
337 c[i] = utf8encodebyte(u, 0);
338 u >>= 6;
339 }
340 c[0] = utf8encodebyte(u, len);
341
342 return len;
343 }
344
345 char
346 utf8encodebyte(Rune u, size_t i)
347 {
348 return utfbyte[i] | (u & ~utfmask[i]);
349 }
350
351 size_t
352 utf8validate(Rune *u, size_t i)
353 {
354 if (!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
355 *u = UTF_INVALID;
356 for (i = 1; *u > utfmax[i]; ++i)
357 ;
358
359 return i;
360 }
361
362 char
363 base64dec_getc(const char **src)
364 {
365 while (**src && !isprint((unsigned char)**src))
366 (*src)++;
367 return **src ? *((*src)++) : '='; /* emulate padding if string ends */
368 }
369
370 char *
371 base64dec(const char *src)
372 {
373 size_t in_len = strlen(src);
374 char *result, *dst;
375 static const char base64_digits[256] = {
376 [43] = 62, 0, 0, 0, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61,
377 0, 0, 0, -1, 0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12,
378 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 0, 0, 0, 0,
379 0, 0, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39,
380 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51
381 };
382
383 if (in_len % 4)
384 in_len += 4 - (in_len % 4);
385 result = dst = xmalloc(in_len / 4 * 3 + 1);
386 while (*src) {
387 int a = base64_digits[(unsigned char) base64dec_getc(&src)];
388 int b = base64_digits[(unsigned char) base64dec_getc(&src)];
389 int c = base64_digits[(unsigned char) base64dec_getc(&src)];
390 int d = base64_digits[(unsigned char) base64dec_getc(&src)];
391
392 /* invalid input. 'a' can be -1, e.g. if src is "\n" (c-str) */
393 if (a == -1 || b == -1)
394 break;
395
396 *dst++ = (a << 2) | ((b & 0x30) >> 4);
397 if (c == -1)
398 break;
399 *dst++ = ((b & 0x0f) << 4) | ((c & 0x3c) >> 2);
400 if (d == -1)
401 break;
402 *dst++ = ((c & 0x03) << 6) | d;
403 }
404 *dst = '\0';
405 return result;
406 }
407
408 void
409 selinit(void)
410 {
411 sel.mode = SEL_IDLE;
412 sel.snap = 0;
413 sel.ob.x = -1;
414 }
415
416 int
417 tlinelen(int y)
418 {
419 int i = term.col;
420
421 if (term.line[y][i - 1].mode & ATTR_WRAP)
422 return i;
423
424 while (i > 0 && term.line[y][i - 1].u == ' ')
425 --i;
426
427 return i;
428 }
429
430 void
431 selstart(int col, int row, int snap)
432 {
433 selclear();
434 sel.mode = SEL_EMPTY;
435 sel.type = SEL_REGULAR;
436 sel.alt = IS_SET(MODE_ALTSCREEN);
437 sel.snap = snap;
438 sel.oe.x = sel.ob.x = col;
439 sel.oe.y = sel.ob.y = row;
440 selnormalize();
441
442 if (sel.snap != 0)
443 sel.mode = SEL_READY;
444 tsetdirt(sel.nb.y, sel.ne.y);
445 }
446
447 void
448 selextend(int col, int row, int type, int done)
449 {
450 int oldey, oldex, oldsby, oldsey, oldtype;
451
452 if (sel.mode == SEL_IDLE)
453 return;
454 if (done && sel.mode == SEL_EMPTY) {
455 selclear();
456 return;
457 }
458
459 oldey = sel.oe.y;
460 oldex = sel.oe.x;
461 oldsby = sel.nb.y;
462 oldsey = sel.ne.y;
463 oldtype = sel.type;
464
465 sel.oe.x = col;
466 sel.oe.y = row;
467 selnormalize();
468 sel.type = type;
469
470 if (oldey != sel.oe.y || oldex != sel.oe.x || oldtype != sel.type || sel.mode == SEL_EMPTY)
471 tsetdirt(MIN(sel.nb.y, oldsby), MAX(sel.ne.y, oldsey));
472
473 sel.mode = done ? SEL_IDLE : SEL_READY;
474 }
475
476 void
477 selnormalize(void)
478 {
479 int i;
480
481 if (sel.type == SEL_REGULAR && sel.ob.y != sel.oe.y) {
482 sel.nb.x = sel.ob.y < sel.oe.y ? sel.ob.x : sel.oe.x;
483 sel.ne.x = sel.ob.y < sel.oe.y ? sel.oe.x : sel.ob.x;
484 } else {
485 sel.nb.x = MIN(sel.ob.x, sel.oe.x);
486 sel.ne.x = MAX(sel.ob.x, sel.oe.x);
487 }
488 sel.nb.y = MIN(sel.ob.y, sel.oe.y);
489 sel.ne.y = MAX(sel.ob.y, sel.oe.y);
490
491 selsnap(&sel.nb.x, &sel.nb.y, -1);
492 selsnap(&sel.ne.x, &sel.ne.y, +1);
493
494 /* expand selection over line breaks */
495 if (sel.type == SEL_RECTANGULAR)
496 return;
497 i = tlinelen(sel.nb.y);
498 if (i < sel.nb.x)
499 sel.nb.x = i;
500 if (tlinelen(sel.ne.y) <= sel.ne.x)
501 sel.ne.x = term.col - 1;
502 }
503
504 int
505 selected(int x, int y)
506 {
507 if (sel.mode == SEL_EMPTY || sel.ob.x == -1 ||
508 sel.alt != IS_SET(MODE_ALTSCREEN))
509 return 0;
510
511 if (sel.type == SEL_RECTANGULAR)
512 return BETWEEN(y, sel.nb.y, sel.ne.y)
513 && BETWEEN(x, sel.nb.x, sel.ne.x);
514
515 return BETWEEN(y, sel.nb.y, sel.ne.y)
516 && (y != sel.nb.y || x >= sel.nb.x)
517 && (y != sel.ne.y || x <= sel.ne.x);
518 }
519
520 void
521 selsnap(int *x, int *y, int direction)
522 {
523 int newx, newy, xt, yt;
524 int delim, prevdelim;
525 const Glyph *gp, *prevgp;
526
527 switch (sel.snap) {
528 case SNAP_WORD:
529 /*
530 * Snap around if the word wraps around at the end or
531 * beginning of a line.
532 */
533 prevgp = &term.line[*y][*x];
534 prevdelim = ISDELIM(prevgp->u);
535 for (;;) {
536 newx = *x + direction;
537 newy = *y;
538 if (!BETWEEN(newx, 0, term.col - 1)) {
539 newy += direction;
540 newx = (newx + term.col) % term.col;
541 if (!BETWEEN(newy, 0, term.row - 1))
542 break;
543
544 if (direction > 0)
545 yt = *y, xt = *x;
546 else
547 yt = newy, xt = newx;
548 if (!(term.line[yt][xt].mode & ATTR_WRAP))
549 break;
550 }
551
552 if (newx >= tlinelen(newy))
553 break;
554
555 gp = &term.line[newy][newx];
556 delim = ISDELIM(gp->u);
557 if (!(gp->mode & ATTR_WDUMMY) && (delim != prevdelim
558 || (delim && gp->u != prevgp->u)))
559 break;
560
561 *x = newx;
562 *y = newy;
563 prevgp = gp;
564 prevdelim = delim;
565 }
566 break;
567 case SNAP_LINE:
568 /*
569 * Snap around if the the previous line or the current one
570 * has set ATTR_WRAP at its end. Then the whole next or
571 * previous line will be selected.
572 */
573 *x = (direction < 0) ? 0 : term.col - 1;
574 if (direction < 0) {
575 for (; *y > 0; *y += direction) {
576 if (!(term.line[*y-1][term.col-1].mode
577 & ATTR_WRAP)) {
578 break;
579 }
580 }
581 } else if (direction > 0) {
582 for (; *y < term.row-1; *y += direction) {
583 if (!(term.line[*y][term.col-1].mode
584 & ATTR_WRAP)) {
585 break;
586 }
587 }
588 }
589 break;
590 }
591 }
592
593 char *
594 getsel(void)
595 {
596 char *str, *ptr;
597 int y, bufsize, lastx, linelen;
598 const Glyph *gp, *last;
599
600 if (sel.ob.x == -1)
601 return NULL;
602
603 bufsize = (term.col+1) * (sel.ne.y-sel.nb.y+1) * UTF_SIZ;
604 ptr = str = xmalloc(bufsize);
605
606 /* append every set & selected glyph to the selection */
607 for (y = sel.nb.y; y <= sel.ne.y; y++) {
608 if ((linelen = tlinelen(y)) == 0) {
609 *ptr++ = '\n';
610 continue;
611 }
612
613 if (sel.type == SEL_RECTANGULAR) {
614 gp = &term.line[y][sel.nb.x];
615 lastx = sel.ne.x;
616 } else {
617 gp = &term.line[y][sel.nb.y == y ? sel.nb.x : 0];
618 lastx = (sel.ne.y == y) ? sel.ne.x : term.col-1;
619 }
620 last = &term.line[y][MIN(lastx, linelen-1)];
621 while (last >= gp && last->u == ' ')
622 --last;
623
624 for ( ; gp <= last; ++gp) {
625 if (gp->mode & ATTR_WDUMMY)
626 continue;
627
628 ptr += utf8encode(gp->u, ptr);
629 }
630
631 /*
632 * Copy and pasting of line endings is inconsistent
633 * in the inconsistent terminal and GUI world.
634 * The best solution seems like to produce '\n' when
635 * something is copied from st and convert '\n' to
636 * '\r', when something to be pasted is received by
637 * st.
638 * FIXME: Fix the computer world.
639 */
640 if ((y < sel.ne.y || lastx >= linelen) &&
641 (!(last->mode & ATTR_WRAP) || sel.type == SEL_RECTANGULAR))
642 *ptr++ = '\n';
643 }
644 *ptr = 0;
645 return str;
646 }
647
648 void
649 selclear(void)
650 {
651 if (sel.ob.x == -1)
652 return;
653 sel.mode = SEL_IDLE;
654 sel.ob.x = -1;
655 tsetdirt(sel.nb.y, sel.ne.y);
656 }
657
658 void
659 die(const char *errstr, ...)
660 {
661 va_list ap;
662
663 va_start(ap, errstr);
664 vfprintf(stderr, errstr, ap);
665 va_end(ap);
666 exit(1);
667 }
668
669 void
670 execsh(char *cmd, char **args)
671 {
672 char *sh, *prog, *arg;
673 const struct passwd *pw;
674
675 errno = 0;
676 if ((pw = getpwuid(getuid())) == NULL) {
677 if (errno)
678 die("getpwuid: %s\n", strerror(errno));
679 else
680 die("who are you?\n");
681 }
682
683 if ((sh = getenv("SHELL")) == NULL)
684 sh = (pw->pw_shell[0]) ? pw->pw_shell : cmd;
685
686 if (args) {
687 prog = args[0];
688 arg = NULL;
689 } else if (scroll) {
690 prog = scroll;
691 arg = utmp ? utmp : sh;
692 } else if (utmp) {
693 prog = utmp;
694 arg = NULL;
695 } else {
696 prog = sh;
697 arg = NULL;
698 }
699 DEFAULT(args, ((char *[]) {prog, arg, NULL}));
700
701 unsetenv("COLUMNS");
702 unsetenv("LINES");
703 unsetenv("TERMCAP");
704 setenv("LOGNAME", pw->pw_name, 1);
705 setenv("USER", pw->pw_name, 1);
706 setenv("SHELL", sh, 1);
707 setenv("HOME", pw->pw_dir, 1);
708 setenv("TERM", termname, 1);
709
710 signal(SIGCHLD, SIG_DFL);
711 signal(SIGHUP, SIG_DFL);
712 signal(SIGINT, SIG_DFL);
713 signal(SIGQUIT, SIG_DFL);
714 signal(SIGTERM, SIG_DFL);
715 signal(SIGALRM, SIG_DFL);
716
717 execvp(prog, args);
718 _exit(1);
719 }
720
721 void
722 sigchld(int a)
723 {
724 int stat;
725 pid_t p;
726
727 if ((p = waitpid(pid, &stat, WNOHANG)) < 0)
728 die("waiting for pid %hd failed: %s\n", pid, strerror(errno));
729
730 if (pid != p)
731 return;
732
733 if (WIFEXITED(stat) && WEXITSTATUS(stat))
734 die("child exited with status %d\n", WEXITSTATUS(stat));
735 else if (WIFSIGNALED(stat))
736 die("child terminated due to signal %d\n", WTERMSIG(stat));
737 _exit(0);
738 }
739
740 void
741 stty(char **args)
742 {
743 char cmd[_POSIX_ARG_MAX], **p, *q, *s;
744 size_t n, siz;
745
746 if ((n = strlen(stty_args)) > sizeof(cmd)-1)
747 die("incorrect stty parameters\n");
748 memcpy(cmd, stty_args, n);
749 q = cmd + n;
750 siz = sizeof(cmd) - n;
751 for (p = args; p && (s = *p); ++p) {
752 if ((n = strlen(s)) > siz-1)
753 die("stty parameter length too long\n");
754 *q++ = ' ';
755 memcpy(q, s, n);
756 q += n;
757 siz -= n + 1;
758 }
759 *q = '\0';
760 if (system(cmd) != 0)
761 perror("Couldn't call stty");
762 }
763
764 int
765 ttynew(const char *line, char *cmd, const char *out, char **args)
766 {
767 int m, s;
768
769 if (out) {
770 term.mode |= MODE_PRINT;
771 iofd = (!strcmp(out, "-")) ?
772 1 : open(out, O_WRONLY | O_CREAT, 0666);
773 if (iofd < 0) {
774 fprintf(stderr, "Error opening %s:%s\n",
775 out, strerror(errno));
776 }
777 }
778
779 if (line) {
780 if ((cmdfd = open(line, O_RDWR)) < 0)
781 die("open line '%s' failed: %s\n",
782 line, strerror(errno));
783 dup2(cmdfd, 0);
784 stty(args);
785 return cmdfd;
786 }
787
788 /* seems to work fine on linux, openbsd and freebsd */
789 if (openpty(&m, &s, NULL, NULL, NULL) < 0)
790 die("openpty failed: %s\n", strerror(errno));
791
792 switch (pid = fork()) {
793 case -1:
794 die("fork failed: %s\n", strerror(errno));
795 break;
796 case 0:
797 close(iofd);
798 close(m);
799 setsid(); /* create a new process group */
800 dup2(s, 0);
801 dup2(s, 1);
802 dup2(s, 2);
803 if (ioctl(s, TIOCSCTTY, NULL) < 0)
804 die("ioctl TIOCSCTTY failed: %s\n", strerror(errno));
805 if (s > 2)
806 close(s);
807 #ifdef __OpenBSD__
808 if (pledge("stdio getpw proc exec", NULL) == -1)
809 die("pledge\n");
810 #endif
811 execsh(cmd, args);
812 break;
813 default:
814 #ifdef __OpenBSD__
815 if (pledge("stdio rpath tty proc", NULL) == -1)
816 die("pledge\n");
817 #endif
818 close(s);
819 cmdfd = m;
820 signal(SIGCHLD, sigchld);
821 break;
822 }
823 return cmdfd;
824 }
825
826 size_t
827 ttyread(void)
828 {
829 static char buf[BUFSIZ];
830 static int buflen = 0;
831 int ret, written;
832
833 /* append read bytes to unprocessed bytes */
834 ret = read(cmdfd, buf+buflen, LEN(buf)-buflen);
835
836 switch (ret) {
837 case 0:
838 exit(0);
839 case -1:
840 die("couldn't read from shell: %s\n", strerror(errno));
841 default:
842 buflen += ret;
843 written = twrite(buf, buflen, 0);
844 buflen -= written;
845 /* keep any incomplete UTF-8 byte sequence for the next call */
846 if (buflen > 0)
847 memmove(buf, buf + written, buflen);
848 return ret;
849 }
850 }
851
852 void
853 ttywrite(const char *s, size_t n, int may_echo)
854 {
855 const char *next;
856
857 if (may_echo && IS_SET(MODE_ECHO))
858 twrite(s, n, 1);
859
860 if (!IS_SET(MODE_CRLF)) {
861 ttywriteraw(s, n);
862 return;
863 }
864
865 /* This is similar to how the kernel handles ONLCR for ttys */
866 while (n > 0) {
867 if (*s == '\r') {
868 next = s + 1;
869 ttywriteraw("\r\n", 2);
870 } else {
871 next = memchr(s, '\r', n);
872 DEFAULT(next, s + n);
873 ttywriteraw(s, next - s);
874 }
875 n -= next - s;
876 s = next;
877 }
878 }
879
880 void
881 ttywriteraw(const char *s, size_t n)
882 {
883 fd_set wfd, rfd;
884 ssize_t r;
885 size_t lim = 256;
886
887 /*
888 * Remember that we are using a pty, which might be a modem line.
889 * Writing too much will clog the line. That's why we are doing this
890 * dance.
891 * FIXME: Migrate the world to Plan 9.
892 */
893 while (n > 0) {
894 FD_ZERO(&wfd);
895 FD_ZERO(&rfd);
896 FD_SET(cmdfd, &wfd);
897 FD_SET(cmdfd, &rfd);
898
899 /* Check if we can write. */
900 if (pselect(cmdfd+1, &rfd, &wfd, NULL, NULL, NULL) < 0) {
901 if (errno == EINTR)
902 continue;
903 die("select failed: %s\n", strerror(errno));
904 }
905 if (FD_ISSET(cmdfd, &wfd)) {
906 /*
907 * Only write the bytes written by ttywrite() or the
908 * default of 256. This seems to be a reasonable value
909 * for a serial line. Bigger values might clog the I/O.
910 */
911 if ((r = write(cmdfd, s, (n < lim)? n : lim)) < 0)
912 goto write_error;
913 if (r < n) {
914 /*
915 * We weren't able to write out everything.
916 * This means the buffer is getting full
917 * again. Empty it.
918 */
919 if (n < lim)
920 lim = ttyread();
921 n -= r;
922 s += r;
923 } else {
924 /* All bytes have been written. */
925 break;
926 }
927 }
928 if (FD_ISSET(cmdfd, &rfd))
929 lim = ttyread();
930 }
931 return;
932
933 write_error:
934 die("write error on tty: %s\n", strerror(errno));
935 }
936
937 void
938 ttyresize(int tw, int th)
939 {
940 struct winsize w;
941
942 w.ws_row = term.row;
943 w.ws_col = term.col;
944 w.ws_xpixel = tw;
945 w.ws_ypixel = th;
946 if (ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
947 fprintf(stderr, "Couldn't set window size: %s\n", strerror(errno));
948 }
949
950 void
951 ttyhangup(void)
952 {
953 /* Send SIGHUP to shell */
954 kill(pid, SIGHUP);
955 }
956
957 int
958 tattrset(int attr)
959 {
960 int i, j;
961
962 for (i = 0; i < term.row-1; i++) {
963 for (j = 0; j < term.col-1; j++) {
964 if (term.line[i][j].mode & attr)
965 return 1;
966 }
967 }
968
969 return 0;
970 }
971
972 void
973 tsetdirt(int top, int bot)
974 {
975 int i;
976
977 LIMIT(top, 0, term.row-1);
978 LIMIT(bot, 0, term.row-1);
979
980 for (i = top; i <= bot; i++)
981 term.dirty[i] = 1;
982 }
983
984 void
985 tsetdirtattr(int attr)
986 {
987 int i, j;
988
989 for (i = 0; i < term.row-1; i++) {
990 for (j = 0; j < term.col-1; j++) {
991 if (term.line[i][j].mode & attr) {
992 tsetdirt(i, i);
993 break;
994 }
995 }
996 }
997 }
998
999 void
1000 tfulldirt(void)
1001 {
1002 tsetdirt(0, term.row-1);
1003 }
1004
1005 void
1006 tcursor(int mode)
1007 {
1008 static TCursor c[2];
1009 int alt = IS_SET(MODE_ALTSCREEN);
1010
1011 if (mode == CURSOR_SAVE) {
1012 c[alt] = term.c;
1013 } else if (mode == CURSOR_LOAD) {
1014 term.c = c[alt];
1015 tmoveto(c[alt].x, c[alt].y);
1016 }
1017 }
1018
1019 void
1020 treset(void)
1021 {
1022 uint i;
1023
1024 term.c = (TCursor){{
1025 .mode = ATTR_NULL,
1026 .fg = defaultfg,
1027 .bg = defaultbg
1028 }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
1029
1030 memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1031 for (i = tabspaces; i < term.col; i += tabspaces)
1032 term.tabs[i] = 1;
1033 term.top = 0;
1034 term.bot = term.row - 1;
1035 term.mode = MODE_WRAP|MODE_UTF8;
1036 memset(term.trantbl, CS_USA, sizeof(term.trantbl));
1037 term.charset = 0;
1038
1039 for (i = 0; i < 2; i++) {
1040 tmoveto(0, 0);
1041 tcursor(CURSOR_SAVE);
1042 tclearregion(0, 0, term.col-1, term.row-1);
1043 tswapscreen();
1044 }
1045 }
1046
1047 void
1048 tnew(int col, int row)
1049 {
1050 term = (Term){ .c = { .attr = { .fg = defaultfg, .bg = defaultbg } } };
1051 tresize(col, row);
1052 treset();
1053 }
1054
1055 void
1056 tswapscreen(void)
1057 {
1058 Line *tmp = term.line;
1059
1060 term.line = term.alt;
1061 term.alt = tmp;
1062 term.mode ^= MODE_ALTSCREEN;
1063 tfulldirt();
1064 }
1065
1066 void
1067 tscrolldown(int orig, int n)
1068 {
1069 int i;
1070 Line temp;
1071
1072 LIMIT(n, 0, term.bot-orig+1);
1073
1074 tsetdirt(orig, term.bot-n);
1075 tclearregion(0, term.bot-n+1, term.col-1, term.bot);
1076
1077 for (i = term.bot; i >= orig+n; i--) {
1078 temp = term.line[i];
1079 term.line[i] = term.line[i-n];
1080 term.line[i-n] = temp;
1081 }
1082
1083 selscroll(orig, n);
1084 }
1085
1086 void
1087 tscrollup(int orig, int n)
1088 {
1089 int i;
1090 Line temp;
1091
1092 LIMIT(n, 0, term.bot-orig+1);
1093
1094 tclearregion(0, orig, term.col-1, orig+n-1);
1095 tsetdirt(orig+n, term.bot);
1096
1097 for (i = orig; i <= term.bot-n; i++) {
1098 temp = term.line[i];
1099 term.line[i] = term.line[i+n];
1100 term.line[i+n] = temp;
1101 }
1102
1103 selscroll(orig, -n);
1104 }
1105
1106 void
1107 selscroll(int orig, int n)
1108 {
1109 if (sel.ob.x == -1)
1110 return;
1111
1112 if (BETWEEN(sel.nb.y, orig, term.bot) != BETWEEN(sel.ne.y, orig, term.bot)) {
1113 selclear();
1114 } else if (BETWEEN(sel.nb.y, orig, term.bot)) {
1115 sel.ob.y += n;
1116 sel.oe.y += n;
1117 if (sel.ob.y < term.top || sel.ob.y > term.bot ||
1118 sel.oe.y < term.top || sel.oe.y > term.bot) {
1119 selclear();
1120 } else {
1121 selnormalize();
1122 }
1123 }
1124 }
1125
1126 void
1127 tnewline(int first_col)
1128 {
1129 int y = term.c.y;
1130
1131 if (y == term.bot) {
1132 tscrollup(term.top, 1);
1133 } else {
1134 y++;
1135 }
1136 tmoveto(first_col ? 0 : term.c.x, y);
1137 }
1138
1139 void
1140 csiparse(void)
1141 {
1142 char *p = csiescseq.buf, *np;
1143 long int v;
1144
1145 csiescseq.narg = 0;
1146 if (*p == '?') {
1147 csiescseq.priv = 1;
1148 p++;
1149 }
1150
1151 csiescseq.buf[csiescseq.len] = '\0';
1152 while (p < csiescseq.buf+csiescseq.len) {
1153 np = NULL;
1154 v = strtol(p, &np, 10);
1155 if (np == p)
1156 v = 0;
1157 if (v == LONG_MAX || v == LONG_MIN)
1158 v = -1;
1159 csiescseq.arg[csiescseq.narg++] = v;
1160 p = np;
1161 if (*p != ';' || csiescseq.narg == ESC_ARG_SIZ)
1162 break;
1163 p++;
1164 }
1165 csiescseq.mode[0] = *p++;
1166 csiescseq.mode[1] = (p < csiescseq.buf+csiescseq.len) ? *p : '\0';
1167 }
1168
1169 /* for absolute user moves, when decom is set */
1170 void
1171 tmoveato(int x, int y)
1172 {
1173 tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
1174 }
1175
1176 void
1177 tmoveto(int x, int y)
1178 {
1179 int miny, maxy;
1180
1181 if (term.c.state & CURSOR_ORIGIN) {
1182 miny = term.top;
1183 maxy = term.bot;
1184 } else {
1185 miny = 0;
1186 maxy = term.row - 1;
1187 }
1188 term.c.state &= ~CURSOR_WRAPNEXT;
1189 term.c.x = LIMIT(x, 0, term.col-1);
1190 term.c.y = LIMIT(y, miny, maxy);
1191 }
1192
1193 void
1194 tsetchar(Rune u, const Glyph *attr, int x, int y)
1195 {
1196 static const char *vt100_0[62] = { /* 0x41 - 0x7e */
1197 "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
1198 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
1199 0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
1200 0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
1201 "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */
1202 "", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */
1203 "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */
1204 "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
1205 };
1206
1207 /*
1208 * The table is proudly stolen from rxvt.
1209 */
1210 if (term.trantbl[term.charset] == CS_GRAPHIC0 &&
1211 BETWEEN(u, 0x41, 0x7e) && vt100_0[u - 0x41])
1212 utf8decode(vt100_0[u - 0x41], &u, UTF_SIZ);
1213
1214 if (term.line[y][x].mode & ATTR_WIDE) {
1215 if (x+1 < term.col) {
1216 term.line[y][x+1].u = ' ';
1217 term.line[y][x+1].mode &= ~ATTR_WDUMMY;
1218 }
1219 } else if (term.line[y][x].mode & ATTR_WDUMMY) {
1220 term.line[y][x-1].u = ' ';
1221 term.line[y][x-1].mode &= ~ATTR_WIDE;
1222 }
1223
1224 term.dirty[y] = 1;
1225 term.line[y][x] = *attr;
1226 term.line[y][x].u = u;
1227 }
1228
1229 void
1230 tclearregion(int x1, int y1, int x2, int y2)
1231 {
1232 int x, y, temp;
1233 Glyph *gp;
1234
1235 if (x1 > x2)
1236 temp = x1, x1 = x2, x2 = temp;
1237 if (y1 > y2)
1238 temp = y1, y1 = y2, y2 = temp;
1239
1240 LIMIT(x1, 0, term.col-1);
1241 LIMIT(x2, 0, term.col-1);
1242 LIMIT(y1, 0, term.row-1);
1243 LIMIT(y2, 0, term.row-1);
1244
1245 for (y = y1; y <= y2; y++) {
1246 term.dirty[y] = 1;
1247 for (x = x1; x <= x2; x++) {
1248 gp = &term.line[y][x];
1249 if (selected(x, y))
1250 selclear();
1251 gp->fg = term.c.attr.fg;
1252 gp->bg = term.c.attr.bg;
1253 gp->mode = 0;
1254 gp->u = ' ';
1255 }
1256 }
1257 }
1258
1259 void
1260 tdeletechar(int n)
1261 {
1262 int dst, src, size;
1263 Glyph *line;
1264
1265 LIMIT(n, 0, term.col - term.c.x);
1266
1267 dst = term.c.x;
1268 src = term.c.x + n;
1269 size = term.col - src;
1270 line = term.line[term.c.y];
1271
1272 memmove(&line[dst], &line[src], size * sizeof(Glyph));
1273 tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1274 }
1275
1276 void
1277 tinsertblank(int n)
1278 {
1279 int dst, src, size;
1280 Glyph *line;
1281
1282 LIMIT(n, 0, term.col - term.c.x);
1283
1284 dst = term.c.x + n;
1285 src = term.c.x;
1286 size = term.col - dst;
1287 line = term.line[term.c.y];
1288
1289 memmove(&line[dst], &line[src], size * sizeof(Glyph));
1290 tclearregion(src, term.c.y, dst - 1, term.c.y);
1291 }
1292
1293 void
1294 tinsertblankline(int n)
1295 {
1296 if (BETWEEN(term.c.y, term.top, term.bot))
1297 tscrolldown(term.c.y, n);
1298 }
1299
1300 void
1301 tdeleteline(int n)
1302 {
1303 if (BETWEEN(term.c.y, term.top, term.bot))
1304 tscrollup(term.c.y, n);
1305 }
1306
1307 int32_t
1308 tdefcolor(const int *attr, int *npar, int l)
1309 {
1310 int32_t idx = -1;
1311 uint r, g, b;
1312
1313 switch (attr[*npar + 1]) {
1314 case 2: /* direct color in RGB space */
1315 if (*npar + 4 >= l) {
1316 fprintf(stderr,
1317 "erresc(38): Incorrect number of parameters (%d)\n",
1318 *npar);
1319 break;
1320 }
1321 r = attr[*npar + 2];
1322 g = attr[*npar + 3];
1323 b = attr[*npar + 4];
1324 *npar += 4;
1325 if (!BETWEEN(r, 0, 255) || !BETWEEN(g, 0, 255) || !BETWEEN(b, 0, 255))
1326 fprintf(stderr, "erresc: bad rgb color (%u,%u,%u)\n",
1327 r, g, b);
1328 else
1329 idx = TRUECOLOR(r, g, b);
1330 break;
1331 case 5: /* indexed color */
1332 if (*npar + 2 >= l) {
1333 fprintf(stderr,
1334 "erresc(38): Incorrect number of parameters (%d)\n",
1335 *npar);
1336 break;
1337 }
1338 *npar += 2;
1339 if (!BETWEEN(attr[*npar], 0, 255))
1340 fprintf(stderr, "erresc: bad fgcolor %d\n", attr[*npar]);
1341 else
1342 idx = attr[*npar];
1343 break;
1344 case 0: /* implemented defined (only foreground) */
1345 case 1: /* transparent */
1346 case 3: /* direct color in CMY space */
1347 case 4: /* direct color in CMYK space */
1348 default:
1349 fprintf(stderr,
1350 "erresc(38): gfx attr %d unknown\n", attr[*npar]);
1351 break;
1352 }
1353
1354 return idx;
1355 }
1356
1357 void
1358 tsetattr(const int *attr, int l)
1359 {
1360 int i;
1361 int32_t idx;
1362
1363 for (i = 0; i < l; i++) {
1364 switch (attr[i]) {
1365 case 0:
1366 term.c.attr.mode &= ~(
1367 ATTR_BOLD |
1368 ATTR_FAINT |
1369 ATTR_ITALIC |
1370 ATTR_UNDERLINE |
1371 ATTR_BLINK |
1372 ATTR_REVERSE |
1373 ATTR_INVISIBLE |
1374 ATTR_STRUCK );
1375 term.c.attr.fg = defaultfg;
1376 term.c.attr.bg = defaultbg;
1377 break;
1378 case 1:
1379 term.c.attr.mode |= ATTR_BOLD;
1380 break;
1381 case 2:
1382 term.c.attr.mode |= ATTR_FAINT;
1383 break;
1384 case 3:
1385 term.c.attr.mode |= ATTR_ITALIC;
1386 break;
1387 case 4:
1388 term.c.attr.mode |= ATTR_UNDERLINE;
1389 break;
1390 case 5: /* slow blink */
1391 /* FALLTHROUGH */
1392 case 6: /* rapid blink */
1393 term.c.attr.mode |= ATTR_BLINK;
1394 break;
1395 case 7:
1396 term.c.attr.mode |= ATTR_REVERSE;
1397 break;
1398 case 8:
1399 term.c.attr.mode |= ATTR_INVISIBLE;
1400 break;
1401 case 9:
1402 term.c.attr.mode |= ATTR_STRUCK;
1403 break;
1404 case 22:
1405 term.c.attr.mode &= ~(ATTR_BOLD | ATTR_FAINT);
1406 break;
1407 case 23:
1408 term.c.attr.mode &= ~ATTR_ITALIC;
1409 break;
1410 case 24:
1411 term.c.attr.mode &= ~ATTR_UNDERLINE;
1412 break;
1413 case 25:
1414 term.c.attr.mode &= ~ATTR_BLINK;
1415 break;
1416 case 27:
1417 term.c.attr.mode &= ~ATTR_REVERSE;
1418 break;
1419 case 28:
1420 term.c.attr.mode &= ~ATTR_INVISIBLE;
1421 break;
1422 case 29:
1423 term.c.attr.mode &= ~ATTR_STRUCK;
1424 break;
1425 case 38:
1426 if ((idx = tdefcolor(attr, &i, l)) >= 0)
1427 term.c.attr.fg = idx;
1428 break;
1429 case 39:
1430 term.c.attr.fg = defaultfg;
1431 break;
1432 case 48:
1433 if ((idx = tdefcolor(attr, &i, l)) >= 0)
1434 term.c.attr.bg = idx;
1435 break;
1436 case 49:
1437 term.c.attr.bg = defaultbg;
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 unknown\n",
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 (IGNORED) */
1504 case 12: /* att610 -- Start blinking cursor (IGNORED) */
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 press */
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:
1536 xsetmode(set, MODE_8BIT);
1537 break;
1538 case 1049: /* swap screen & set/restore cursor as xterm */
1539 if (!allowaltscreen)
1540 break;
1541 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1542 /* FALLTHROUGH */
1543 case 47: /* swap screen */
1544 case 1047:
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:
1558 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1559 break;
1560 case 2004: /* 2004: bracketed paste mode */
1561 xsetmode(set, MODE_BRCKTPASTE);
1562 break;
1563 /* Not implemented mouse modes. See comments there. */
1564 case 1001: /* mouse highlight mode; can hang the
1565 terminal by design when implemented. */
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; incompatible
1570 and can be mistaken for other control
1571 codes. */
1572 break;
1573 default:
1574 fprintf(stderr,
1575 "erresc: unknown private set/reset mode %d\n",
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 %d\n",
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 times */
1655 DEFAULT(csiescseq.arg[0], 1);
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.tabs));
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, term.c.y);
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 > 1)
1715 tclearregion(0, 0, term.col-1, term.c.y-1);
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 DEFAULT(csiescseq.arg[0], 1);
1741 tscrollup(term.top, csiescseq.arg[0]);
1742 break;
1743 case 'T': /* SD -- Scroll <n> line down */
1744 DEFAULT(csiescseq.arg[0], 1);
1745 tscrolldown(term.top, csiescseq.arg[0]);
1746 break;
1747 case 'L': /* IL -- Insert <n> blank lines */
1748 DEFAULT(csiescseq.arg[0], 1);
1749 tinsertblankline(csiescseq.arg[0]);
1750 break;
1751 case 'l': /* RM -- Reset Mode */
1752 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
1753 break;
1754 case 'M': /* DL -- Delete <n> lines */
1755 DEFAULT(csiescseq.arg[0], 1);
1756 tdeleteline(csiescseq.arg[0]);
1757 break;
1758 case 'X': /* ECH -- Erase <n> char */
1759 DEFAULT(csiescseq.arg[0], 1);
1760 tclearregion(term.c.x, term.c.y,
1761 term.c.x + csiescseq.arg[0] - 1, term.c.y);
1762 break;
1763 case 'P': /* DCH -- Delete <n> char */
1764 DEFAULT(csiescseq.arg[0], 1);
1765 tdeletechar(csiescseq.arg[0]);
1766 break;
1767 case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
1768 DEFAULT(csiescseq.arg[0], 1);
1769 tputtab(-csiescseq.arg[0]);
1770 break;
1771 case 'd': /* VPA -- Move to <row> */
1772 DEFAULT(csiescseq.arg[0], 1);
1773 tmoveato(term.c.x, csiescseq.arg[0]-1);
1774 break;
1775 case 'h': /* SM -- Set terminal mode */
1776 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
1777 break;
1778 case 'm': /* SGR -- Terminal attribute (color) */
1779 tsetattr(csiescseq.arg, csiescseq.narg);
1780 break;
1781 case 'n': /* DSR – Device Status Report (cursor position) */
1782 if (csiescseq.arg[0] == 6) {
1783 len = snprintf(buf, sizeof(buf), "\033[%i;%iR",
1784 term.c.y+1, term.c.x+1);
1785 ttywrite(buf, len, 0);
1786 }
1787 break;
1788 case 'r': /* DECSTBM -- Set Scrolling Region */
1789 if (csiescseq.priv) {
1790 goto unknown;
1791 } else {
1792 DEFAULT(csiescseq.arg[0], 1);
1793 DEFAULT(csiescseq.arg[1], term.row);
1794 tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
1795 tmoveato(0, 0);
1796 }
1797 break;
1798 case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
1799 tcursor(CURSOR_SAVE);
1800 break;
1801 case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
1802 tcursor(CURSOR_LOAD);
1803 break;
1804 case ' ':
1805 switch (csiescseq.mode[1]) {
1806 case 'q': /* DECSCUSR -- Set Cursor Style */
1807 if (xsetcursor(csiescseq.arg[0]))
1808 goto unknown;
1809 break;
1810 default:
1811 goto unknown;
1812 }
1813 break;
1814 }
1815 }
1816
1817 void
1818 csidump(void)
1819 {
1820 size_t i;
1821 uint c;
1822
1823 fprintf(stderr, "ESC[");
1824 for (i = 0; i < csiescseq.len; i++) {
1825 c = csiescseq.buf[i] & 0xff;
1826 if (isprint(c)) {
1827 putc(c, stderr);
1828 } else if (c == '\n') {
1829 fprintf(stderr, "(\\n)");
1830 } else if (c == '\r') {
1831 fprintf(stderr, "(\\r)");
1832 } else if (c == 0x1b) {
1833 fprintf(stderr, "(\\e)");
1834 } else {
1835 fprintf(stderr, "(%02x)", c);
1836 }
1837 }
1838 putc('\n', stderr);
1839 }
1840
1841 void
1842 csireset(void)
1843 {
1844 memset(&csiescseq, 0, sizeof(csiescseq));
1845 }
1846
1847 void
1848 osc_color_response(int num, int index, int is_osc4)
1849 {
1850 int n;
1851 char buf[32];
1852 unsigned char r, g, b;
1853
1854 if (xgetcolor(is_osc4 ? num : index, &r, &g, &b)) {
1855 fprintf(stderr, "erresc: failed to fetch %s color %d\n",
1856 is_osc4 ? "osc4" : "osc",
1857 is_osc4 ? num : index);
1858 return;
1859 }
1860
1861 n = snprintf(buf, sizeof buf, "\033]%s%d;rgb:%02x%02x/%02x%02x/%02x%02x\007",
1862 is_osc4 ? "4;" : "", num, r, r, g, g, b, b);
1863 if (n < 0 || n >= sizeof(buf)) {
1864 fprintf(stderr, "error: %s while printing %s response\n",
1865 n < 0 ? "snprintf failed" : "truncation occurred",
1866 is_osc4 ? "osc4" : "osc");
1867 } else {
1868 ttywrite(buf, n, 1);
1869 }
1870 }
1871
1872 void
1873 strhandle(void)
1874 {
1875 char *p = NULL, *dec;
1876 int j, narg, par;
1877 const struct { int idx; char *str; } osc_table[] = {
1878 { defaultfg, "foreground" },
1879 { defaultbg, "background" },
1880 { defaultcs, "cursor" }
1881 };
1882
1883 term.esc &= ~(ESC_STR_END|ESC_STR);
1884 strparse();
1885 par = (narg = strescseq.narg) ? atoi(strescseq.args[0]) : 0;
1886
1887 switch (strescseq.type) {
1888 case ']': /* OSC -- Operating System Command */
1889 switch (par) {
1890 case 0:
1891 if (narg > 1) {
1892 xsettitle(strescseq.args[1]);
1893 xseticontitle(strescseq.args[1]);
1894 }
1895 return;
1896 case 1:
1897 if (narg > 1)
1898 xseticontitle(strescseq.args[1]);
1899 return;
1900 case 2:
1901 if (narg > 1)
1902 xsettitle(strescseq.args[1]);
1903 return;
1904 case 52:
1905 if (narg > 2 && allowwindowops) {
1906 dec = base64dec(strescseq.args[2]);
1907 if (dec) {
1908 xsetsel(dec);
1909 xclipcopy();
1910 } else {
1911 fprintf(stderr, "erresc: invalid base64\n");
1912 }
1913 }
1914 return;
1915 case 10:
1916 case 11:
1917 case 12:
1918 if (narg < 2)
1919 break;
1920 p = strescseq.args[1];
1921 if ((j = par - 10) < 0 || j >= LEN(osc_table))
1922 break; /* shouldn't be possible */
1923
1924 if (!strcmp(p, "?")) {
1925 osc_color_response(par, osc_table[j].idx, 0);
1926 } else if (xsetcolorname(osc_table[j].idx, p)) {
1927 fprintf(stderr, "erresc: invalid %s color: %s\n",
1928 osc_table[j].str, p);
1929 } else {
1930 tfulldirt();
1931 }
1932 return;
1933 case 4: /* color set */
1934 if (narg < 3)
1935 break;
1936 p = strescseq.args[2];
1937 /* FALLTHROUGH */
1938 case 104: /* color reset */
1939 j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
1940
1941 if (p && !strcmp(p, "?")) {
1942 osc_color_response(j, 0, 1);
1943 } else if (xsetcolorname(j, p)) {
1944 if (par == 104 && narg <= 1)
1945 return; /* color reset without parameter */
1946 fprintf(stderr, "erresc: invalid color j=%d, p=%s\n",
1947 j, p ? p : "(null)");
1948 } else {
1949 /*
1950 * TODO if defaultbg color is changed, borders
1951 * are dirty
1952 */
1953 tfulldirt();
1954 }
1955 return;
1956 }
1957 break;
1958 case 'k': /* old title set compatibility */
1959 xsettitle(strescseq.args[0]);
1960 return;
1961 case 'P': /* DCS -- Device Control String */
1962 case '_': /* APC -- Application Program Command */
1963 case '^': /* PM -- Privacy Message */
1964 return;
1965 }
1966
1967 fprintf(stderr, "erresc: unknown str ");
1968 strdump();
1969 }
1970
1971 void
1972 strparse(void)
1973 {
1974 int c;
1975 char *p = strescseq.buf;
1976
1977 strescseq.narg = 0;
1978 strescseq.buf[strescseq.len] = '\0';
1979
1980 if (*p == '\0')
1981 return;
1982
1983 while (strescseq.narg < STR_ARG_SIZ) {
1984 strescseq.args[strescseq.narg++] = p;
1985 while ((c = *p) != ';' && c != '\0')
1986 ++p;
1987 if (c == '\0')
1988 return;
1989 *p++ = '\0';
1990 }
1991 }
1992
1993 void
1994 strdump(void)
1995 {
1996 size_t i;
1997 uint c;
1998
1999 fprintf(stderr, "ESC%c", strescseq.type);
2000 for (i = 0; i < strescseq.len; i++) {
2001 c = strescseq.buf[i] & 0xff;
2002 if (c == '\0') {
2003 putc('\n', stderr);
2004 return;
2005 } else if (isprint(c)) {
2006 putc(c, stderr);
2007 } else if (c == '\n') {
2008 fprintf(stderr, "(\\n)");
2009 } else if (c == '\r') {
2010 fprintf(stderr, "(\\r)");
2011 } else if (c == 0x1b) {
2012 fprintf(stderr, "(\\e)");
2013 } else {
2014 fprintf(stderr, "(%02x)", c);
2015 }
2016 }
2017 fprintf(stderr, "ESC\\\n");
2018 }
2019
2020 void
2021 strreset(void)
2022 {
2023 strescseq = (STREscape){
2024 .buf = xrealloc(strescseq.buf, STR_BUF_SIZ),
2025 .siz = STR_BUF_SIZ,
2026 };
2027 }
2028
2029 void
2030 sendbreak(const Arg *arg)
2031 {
2032 if (tcsendbreak(cmdfd, 0))
2033 perror("Error sending break");
2034 }
2035
2036 void
2037 tprinter(char *s, size_t len)
2038 {
2039 if (iofd != -1 && xwrite(iofd, s, len) < 0) {
2040 perror("Error writing to output file");
2041 close(iofd);
2042 iofd = -1;
2043 }
2044 }
2045
2046 void
2047 toggleprinter(const Arg *arg)
2048 {
2049 term.mode ^= MODE_PRINT;
2050 }
2051
2052 void
2053 printscreen(const Arg *arg)
2054 {
2055 tdump();
2056 }
2057
2058 void
2059 printsel(const Arg *arg)
2060 {
2061 tdumpsel();
2062 }
2063
2064 void
2065 tdumpsel(void)
2066 {
2067 char *ptr;
2068
2069 if ((ptr = getsel())) {
2070 tprinter(ptr, strlen(ptr));
2071 free(ptr);
2072 }
2073 }
2074
2075 void
2076 tdumpline(int n)
2077 {
2078 char buf[UTF_SIZ];
2079 const Glyph *bp, *end;
2080
2081 bp = &term.line[n][0];
2082 end = &bp[MIN(tlinelen(n), term.col) - 1];
2083 if (bp != end || bp->u != ' ') {
2084 for ( ; bp <= end; ++bp)
2085 tprinter(buf, utf8encode(bp->u, buf));
2086 }
2087 tprinter("\n", 1);
2088 }
2089
2090 void
2091 tdump(void)
2092 {
2093 int i;
2094
2095 for (i = 0; i < term.row; ++i)
2096 tdumpline(i);
2097 }
2098
2099 void
2100 tputtab(int n)
2101 {
2102 uint x = term.c.x;
2103
2104 if (n > 0) {
2105 while (x < term.col && n--)
2106 for (++x; x < term.col && !term.tabs[x]; ++x)
2107 /* nothing */ ;
2108 } else if (n < 0) {
2109 while (x > 0 && n++)
2110 for (--x; x > 0 && !term.tabs[x]; --x)
2111 /* nothing */ ;
2112 }
2113 term.c.x = LIMIT(x, 0, term.col-1);
2114 }
2115
2116 void
2117 tdefutf8(char ascii)
2118 {
2119 if (ascii == 'G')
2120 term.mode |= MODE_UTF8;
2121 else if (ascii == '@')
2122 term.mode &= ~MODE_UTF8;
2123 }
2124
2125 void
2126 tdeftran(char ascii)
2127 {
2128 static char cs[] = "0B";
2129 static int vcs[] = {CS_GRAPHIC0, CS_USA};
2130 char *p;
2131
2132 if ((p = strchr(cs, ascii)) == NULL) {
2133 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
2134 } else {
2135 term.trantbl[term.icharset] = vcs[p - cs];
2136 }
2137 }
2138
2139 void
2140 tdectest(char c)
2141 {
2142 int x, y;
2143
2144 if (c == '8') { /* DEC screen alignment test. */
2145 for (x = 0; x < term.col; ++x) {
2146 for (y = 0; y < term.row; ++y)
2147 tsetchar('E', &term.c.attr, x, y);
2148 }
2149 }
2150 }
2151
2152 void
2153 tstrsequence(uchar c)
2154 {
2155 switch (c) {
2156 case 0x90: /* DCS -- Device Control String */
2157 c = 'P';
2158 break;
2159 case 0x9f: /* APC -- Application Program Command */
2160 c = '_';
2161 break;
2162 case 0x9e: /* PM -- Privacy Message */
2163 c = '^';
2164 break;
2165 case 0x9d: /* OSC -- Operating System Command */
2166 c = ']';
2167 break;
2168 }
2169 strreset();
2170 strescseq.type = c;
2171 term.esc |= ESC_STR;
2172 }
2173
2174 void
2175 tcontrolcode(uchar ascii)
2176 {
2177 switch (ascii) {
2178 case '\t': /* HT */
2179 tputtab(1);
2180 return;
2181 case '\b': /* BS */
2182 tmoveto(term.c.x-1, term.c.y);
2183 return;
2184 case '\r': /* CR */
2185 tmoveto(0, term.c.y);
2186 return;
2187 case '\f': /* LF */
2188 case '\v': /* VT */
2189 case '\n': /* LF */
2190 /* go to first col if the mode is set */
2191 tnewline(IS_SET(MODE_CRLF));
2192 return;
2193 case '\a': /* BEL */
2194 if (term.esc & ESC_STR_END) {
2195 /* backwards compatibility to xterm */
2196 strhandle();
2197 } else {
2198 xbell();
2199 }
2200 break;
2201 case '\033': /* ESC */
2202 csireset();
2203 term.esc &= ~(ESC_CSI|ESC_ALTCHARSET|ESC_TEST);
2204 term.esc |= ESC_START;
2205 return;
2206 case '\016': /* SO (LS1 -- Locking shift 1) */
2207 case '\017': /* SI (LS0 -- Locking shift 0) */
2208 term.charset = 1 - (ascii - '\016');
2209 return;
2210 case '\032': /* SUB */
2211 tsetchar('?', &term.c.attr, term.c.x, term.c.y);
2212 /* FALLTHROUGH */
2213 case '\030': /* CAN */
2214 csireset();
2215 break;
2216 case '\005': /* ENQ (IGNORED) */
2217 case '\000': /* NUL (IGNORED) */
2218 case '\021': /* XON (IGNORED) */
2219 case '\023': /* XOFF (IGNORED) */
2220 case 0177: /* DEL (IGNORED) */
2221 return;
2222 case 0x80: /* TODO: PAD */
2223 case 0x81: /* TODO: HOP */
2224 case 0x82: /* TODO: BPH */
2225 case 0x83: /* TODO: NBH */
2226 case 0x84: /* TODO: IND */
2227 break;
2228 case 0x85: /* NEL -- Next line */
2229 tnewline(1); /* always go to first col */
2230 break;
2231 case 0x86: /* TODO: SSA */
2232 case 0x87: /* TODO: ESA */
2233 break;
2234 case 0x88: /* HTS -- Horizontal tab stop */
2235 term.tabs[term.c.x] = 1;
2236 break;
2237 case 0x89: /* TODO: HTJ */
2238 case 0x8a: /* TODO: VTS */
2239 case 0x8b: /* TODO: PLD */
2240 case 0x8c: /* TODO: PLU */
2241 case 0x8d: /* TODO: RI */
2242 case 0x8e: /* TODO: SS2 */
2243 case 0x8f: /* TODO: SS3 */
2244 case 0x91: /* TODO: PU1 */
2245 case 0x92: /* TODO: PU2 */
2246 case 0x93: /* TODO: STS */
2247 case 0x94: /* TODO: CCH */
2248 case 0x95: /* TODO: MW */
2249 case 0x96: /* TODO: SPA */
2250 case 0x97: /* TODO: EPA */
2251 case 0x98: /* TODO: SOS */
2252 case 0x99: /* TODO: SGCI */
2253 break;
2254 case 0x9a: /* DECID -- Identify Terminal */
2255 ttywrite(vtiden, strlen(vtiden), 0);
2256 break;
2257 case 0x9b: /* TODO: CSI */
2258 case 0x9c: /* TODO: ST */
2259 break;
2260 case 0x90: /* DCS -- Device Control String */
2261 case 0x9d: /* OSC -- Operating System Command */
2262 case 0x9e: /* PM -- Privacy Message */
2263 case 0x9f: /* APC -- Application Program Command */
2264 tstrsequence(ascii);
2265 return;
2266 }
2267 /* only CAN, SUB, \a and C1 chars interrupt a sequence */
2268 term.esc &= ~(ESC_STR_END|ESC_STR);
2269 }
2270
2271 /*
2272 * returns 1 when the sequence is finished and it hasn't to read
2273 * more characters for this sequence, otherwise 0
2274 */
2275 int
2276 eschandle(uchar ascii)
2277 {
2278 switch (ascii) {
2279 case '[':
2280 term.esc |= ESC_CSI;
2281 return 0;
2282 case '#':
2283 term.esc |= ESC_TEST;
2284 return 0;
2285 case '%':
2286 term.esc |= ESC_UTF8;
2287 return 0;
2288 case 'P': /* DCS -- Device Control String */
2289 case '_': /* APC -- Application Program Command */
2290 case '^': /* PM -- Privacy Message */
2291 case ']': /* OSC -- Operating System Command */
2292 case 'k': /* old title set compatibility */
2293 tstrsequence(ascii);
2294 return 0;
2295 case 'n': /* LS2 -- Locking shift 2 */
2296 case 'o': /* LS3 -- Locking shift 3 */
2297 term.charset = 2 + (ascii - 'n');
2298 break;
2299 case '(': /* GZD4 -- set primary charset G0 */
2300 case ')': /* G1D4 -- set secondary charset G1 */
2301 case '*': /* G2D4 -- set tertiary charset G2 */
2302 case '+': /* G3D4 -- set quaternary charset G3 */
2303 term.icharset = ascii - '(';
2304 term.esc |= ESC_ALTCHARSET;
2305 return 0;
2306 case 'D': /* IND -- Linefeed */
2307 if (term.c.y == term.bot) {
2308 tscrollup(term.top, 1);
2309 } else {
2310 tmoveto(term.c.x, term.c.y+1);
2311 }
2312 break;
2313 case 'E': /* NEL -- Next line */
2314 tnewline(1); /* always go to first col */
2315 break;
2316 case 'H': /* HTS -- Horizontal tab stop */
2317 term.tabs[term.c.x] = 1;
2318 break;
2319 case 'M': /* RI -- Reverse index */
2320 if (term.c.y == term.top) {
2321 tscrolldown(term.top, 1);
2322 } else {
2323 tmoveto(term.c.x, term.c.y-1);
2324 }
2325 break;
2326 case 'Z': /* DECID -- Identify Terminal */
2327 ttywrite(vtiden, strlen(vtiden), 0);
2328 break;
2329 case 'c': /* RIS -- Reset to initial state */
2330 treset();
2331 resettitle();
2332 xloadcols();
2333 break;
2334 case '=': /* DECPAM -- Application keypad */
2335 xsetmode(1, MODE_APPKEYPAD);
2336 break;
2337 case '>': /* DECPNM -- Normal keypad */
2338 xsetmode(0, MODE_APPKEYPAD);
2339 break;
2340 case '7': /* DECSC -- Save Cursor */
2341 tcursor(CURSOR_SAVE);
2342 break;
2343 case '8': /* DECRC -- Restore Cursor */
2344 tcursor(CURSOR_LOAD);
2345 break;
2346 case '\\': /* ST -- String Terminator */
2347 if (term.esc & ESC_STR_END)
2348 strhandle();
2349 break;
2350 default:
2351 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
2352 (uchar) ascii, isprint(ascii)? ascii:'.');
2353 break;
2354 }
2355 return 1;
2356 }
2357
2358 void
2359 tputc(Rune u)
2360 {
2361 char c[UTF_SIZ];
2362 int control;
2363 int width, len;
2364 Glyph *gp;
2365
2366 control = ISCONTROL(u);
2367 if (u < 127 || !IS_SET(MODE_UTF8)) {
2368 c[0] = u;
2369 width = len = 1;
2370 } else {
2371 len = utf8encode(u, c);
2372 if (!control && (width = wcwidth(u)) == -1)
2373 width = 1;
2374 }
2375
2376 if (IS_SET(MODE_PRINT))
2377 tprinter(c, len);
2378
2379 /*
2380 * STR sequence must be checked before anything else
2381 * because it uses all following characters until it
2382 * receives a ESC, a SUB, a ST or any other C1 control
2383 * character.
2384 */
2385 if (term.esc & ESC_STR) {
2386 if (u == '\a' || u == 030 || u == 032 || u == 033 ||
2387 ISCONTROLC1(u)) {
2388 term.esc &= ~(ESC_START|ESC_STR);
2389 term.esc |= ESC_STR_END;
2390 goto check_control_code;
2391 }
2392
2393 if (strescseq.len+len >= strescseq.siz) {
2394 /*
2395 * Here is a bug in terminals. If the user never sends
2396 * some code to stop the str or esc command, then st
2397 * will stop responding. But this is better than
2398 * silently failing with unknown characters. At least
2399 * then users will report back.
2400 *
2401 * In the case users ever get fixed, here is the code:
2402 */
2403 /*
2404 * term.esc = 0;
2405 * strhandle();
2406 */
2407 if (strescseq.siz > (SIZE_MAX - UTF_SIZ) / 2)
2408 return;
2409 strescseq.siz *= 2;
2410 strescseq.buf = xrealloc(strescseq.buf, strescseq.siz);
2411 }
2412
2413 memmove(&strescseq.buf[strescseq.len], c, len);
2414 strescseq.len += len;
2415 return;
2416 }
2417
2418 check_control_code:
2419 /*
2420 * Actions of control codes must be performed as soon they arrive
2421 * because they can be embedded inside a control sequence, and
2422 * they must not cause conflicts with sequences.
2423 */
2424 if (control) {
2425 tcontrolcode(u);
2426 /*
2427 * control codes are not shown ever
2428 */
2429 if (!term.esc)
2430 term.lastc = 0;
2431 return;
2432 } else if (term.esc & ESC_START) {
2433 if (term.esc & ESC_CSI) {
2434 csiescseq.buf[csiescseq.len++] = u;
2435 if (BETWEEN(u, 0x40, 0x7E)
2436 || csiescseq.len >= \
2437 sizeof(csiescseq.buf)-1) {
2438 term.esc = 0;
2439 csiparse();
2440 csihandle();
2441 }
2442 return;
2443 } else if (term.esc & ESC_UTF8) {
2444 tdefutf8(u);
2445 } else if (term.esc & ESC_ALTCHARSET) {
2446 tdeftran(u);
2447 } else if (term.esc & ESC_TEST) {
2448 tdectest(u);
2449 } else {
2450 if (!eschandle(u))
2451 return;
2452 /* sequence already finished */
2453 }
2454 term.esc = 0;
2455 /*
2456 * All characters which form part of a sequence are not
2457 * printed
2458 */
2459 return;
2460 }
2461 if (selected(term.c.x, term.c.y))
2462 selclear();
2463
2464 gp = &term.line[term.c.y][term.c.x];
2465 if (IS_SET(MODE_WRAP) && (term.c.state & CURSOR_WRAPNEXT)) {
2466 gp->mode |= ATTR_WRAP;
2467 tnewline(1);
2468 gp = &term.line[term.c.y][term.c.x];
2469 }
2470
2471 if (IS_SET(MODE_INSERT) && term.c.x+width < term.col)
2472 memmove(gp+width, gp, (term.col - term.c.x - width) * sizeof(Glyph));
2473
2474 if (term.c.x+width > term.col) {
2475 tnewline(1);
2476 gp = &term.line[term.c.y][term.c.x];
2477 }
2478
2479 tsetchar(u, &term.c.attr, term.c.x, term.c.y);
2480 term.lastc = u;
2481
2482 if (width == 2) {
2483 gp->mode |= ATTR_WIDE;
2484 if (term.c.x+1 < term.col) {
2485 if (gp[1].mode == ATTR_WIDE && term.c.x+2 < term.col) {
2486 gp[2].u = ' ';
2487 gp[2].mode &= ~ATTR_WDUMMY;
2488 }
2489 gp[1].u = '\0';
2490 gp[1].mode = ATTR_WDUMMY;
2491 }
2492 }
2493 if (term.c.x+width < term.col) {
2494 tmoveto(term.c.x+width, term.c.y);
2495 } else {
2496 term.c.state |= CURSOR_WRAPNEXT;
2497 }
2498 }
2499
2500 int
2501 twrite(const char *buf, int buflen, int show_ctrl)
2502 {
2503 int charsize;
2504 Rune u;
2505 int n;
2506
2507 for (n = 0; n < buflen; n += charsize) {
2508 if (IS_SET(MODE_UTF8)) {
2509 /* process a complete utf8 char */
2510 charsize = utf8decode(buf + n, &u, buflen - n);
2511 if (charsize == 0)
2512 break;
2513 } else {
2514 u = buf[n] & 0xFF;
2515 charsize = 1;
2516 }
2517 if (show_ctrl && ISCONTROL(u)) {
2518 if (u & 0x80) {
2519 u &= 0x7f;
2520 tputc('^');
2521 tputc('[');
2522 } else if (u != '\n' && u != '\r' && u != '\t') {
2523 u ^= 0x40;
2524 tputc('^');
2525 }
2526 }
2527 tputc(u);
2528 }
2529 return n;
2530 }
2531
2532 void
2533 tresize(int col, int row)
2534 {
2535 int i;
2536 int minrow = MIN(row, term.row);
2537 int mincol = MIN(col, term.col);
2538 int *bp;
2539 TCursor c;
2540
2541 if (col < 1 || row < 1) {
2542 fprintf(stderr,
2543 "tresize: error resizing to %dx%d\n", col, row);
2544 return;
2545 }
2546
2547 /*
2548 * slide screen to keep cursor where we expect it -
2549 * tscrollup would work here, but we can optimize to
2550 * memmove because we're freeing the earlier lines
2551 */
2552 for (i = 0; i <= term.c.y - row; i++) {
2553 free(term.line[i]);
2554 free(term.alt[i]);
2555 }
2556 /* ensure that both src and dst are not NULL */
2557 if (i > 0) {
2558 memmove(term.line, term.line + i, row * sizeof(Line));
2559 memmove(term.alt, term.alt + i, row * sizeof(Line));
2560 }
2561 for (i += row; i < term.row; i++) {
2562 free(term.line[i]);
2563 free(term.alt[i]);
2564 }
2565
2566 /* resize to new height */
2567 term.line = xrealloc(term.line, row * sizeof(Line));
2568 term.alt = xrealloc(term.alt, row * sizeof(Line));
2569 term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
2570 term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
2571
2572 /* resize each row to new width, zero-pad if needed */
2573 for (i = 0; i < minrow; i++) {
2574 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
2575 term.alt[i] = xrealloc(term.alt[i], col * sizeof(Glyph));
2576 }
2577
2578 /* allocate any new rows */
2579 for (/* i = minrow */; i < row; i++) {
2580 term.line[i] = xmalloc(col * sizeof(Glyph));
2581 term.alt[i] = xmalloc(col * sizeof(Glyph));
2582 }
2583 if (col > term.col) {
2584 bp = term.tabs + term.col;
2585
2586 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
2587 while (--bp > term.tabs && !*bp)
2588 /* nothing */ ;
2589 for (bp += tabspaces; bp < term.tabs + col; bp += tabspaces)
2590 *bp = 1;
2591 }
2592 /* update terminal size */
2593 term.col = col;
2594 term.row = row;
2595 /* reset scrolling region */
2596 tsetscroll(0, row-1);
2597 /* make use of the LIMIT in tmoveto */
2598 tmoveto(term.c.x, term.c.y);
2599 /* Clearing both screens (it makes dirty all lines) */
2600 c = term.c;
2601 for (i = 0; i < 2; i++) {
2602 if (mincol < col && 0 < minrow) {
2603 tclearregion(mincol, 0, col - 1, minrow - 1);
2604 }
2605 if (0 < col && minrow < row) {
2606 tclearregion(0, minrow, col - 1, row - 1);
2607 }
2608 tswapscreen();
2609 tcursor(CURSOR_LOAD);
2610 }
2611 term.c = c;
2612 }
2613
2614 void
2615 resettitle(void)
2616 {
2617 xsettitle(NULL);
2618 }
2619
2620 void
2621 drawregion(int x1, int y1, int x2, int y2)
2622 {
2623 int y;
2624
2625 for (y = y1; y < y2; y++) {
2626 if (!term.dirty[y])
2627 continue;
2628
2629 term.dirty[y] = 0;
2630 xdrawline(term.line[y], x1, y, x2);
2631 }
2632 }
2633
2634 void
2635 draw(void)
2636 {
2637 int cx = term.c.x, ocx = term.ocx, ocy = term.ocy;
2638
2639 if (!xstartdraw())
2640 return;
2641
2642 /* adjust cursor position */
2643 LIMIT(term.ocx, 0, term.col-1);
2644 LIMIT(term.ocy, 0, term.row-1);
2645 if (term.line[term.ocy][term.ocx].mode & ATTR_WDUMMY)
2646 term.ocx--;
2647 if (term.line[term.c.y][cx].mode & ATTR_WDUMMY)
2648 cx--;
2649
2650 drawregion(0, 0, term.col, term.row);
2651 xdrawcursor(cx, term.c.y, term.line[term.c.y][cx],
2652 term.ocx, term.ocy, term.line[term.ocy][term.ocx]);
2653 term.ocx = cx;
2654 term.ocy = term.c.y;
2655 xfinishdraw();
2656 if (ocx != term.ocx || ocy != term.ocy)
2657 xximspot(term.ocx, term.ocy);
2658 }
2659
2660 void
2661 redraw(void)
2662 {
2663 tfulldirt();
2664 draw();
2665 }